Patent Application
20140371789
Some applications of the invention relate generally to surgical procedures, and more specifically to apparatus and methods for minimally-invasive surgery, such as minimally-invasive cardiac surgery.
Heart valve surgery is used to repair or replace diseased heart valves. Transcatheter alternatives to standard valve implantation, such as aortic valve replacement, have been developed to reduce mortality and morbidity rates in subjects in whom the risk of conventional surgery for valve replacement is considered to be high. Techniques for transcatheter mitral valve replacement are currently being developed.
Transapical transcatheter valve implantation techniques exist and typically involve an incision, for example, a thoracotomy, in order to gain access to the heart.
Transfemoral retrograde valve delivery is also a known procedure for valve replacement; however it is typically limited by the size of the delivery system and is generally not recommended for patients with an existing peripheral vascular disease.
In some applications of the present invention, apparatus and methods for minimally invasive cardiac surgery are provided. For some applications, the apparatus and methods are used to replace and/or repair a defective valve (e.g., an aortic valve, or a mitral valve) or any other cardiac structure. For some applications, the method comprises accessing a subject's cardiac anatomy in a percutaneous manner and delivering a tool into the heart for repair and/or replacement of a cardiac structure. Typically, some methods of the present invention are used in order to perform minimally-invasive implantation or repair of a heart valve. Additionally or alternatively, some methods of the present invention are suitable for use in any other type of cardiac surgery that can be performed with a minimally-invasive approach, such as ablation of a heart wall, implantation of a cardiac assist device, repairing a structural defect of the heart, repair of a failed bioprosthesis, occlusion of a cardiac structure such as a left atrial appendage, treatment of atrial fibrillation, treatment of heart failure, and/or transvascular approach to repairing or implanting a device in the ascending aorta, the aortic arch, and or the carotid arteries.
In some applications of the present invention, a first catheter is advanced through a peripheral blood vessel of the subject into a chamber of the heart, using known techniques. Once the catheter is in a desired position within the chamber of the heart, a longitudinal element e.g., a guidewire or an additional catheter, is passed through the first catheter, and a passage in a wall of the heart is created from within the chamber of the heart. The longitudinal element is passed through the passage, out of the heart, and through skin of the subject, such that the longitudinal element extends from the heart to the skin. A tool (such as cannula) is then passed into the heart over the longitudinal element. The tool is typically used to facilitate repair and/or replacement of a defective cardiac structure.
There is therefore provided, in accordance with some applications of the present invention, apparatus including:
a trocar that defines a lumen therethrough, configured to provide a passage through skin of a subject into a body of the subject; and
a cannula configured to be placed into the subject's body via the passage provided by the trocar, the cannula configured to be slidable with respect to the trocar, the cannula including:
For some applications, the apparatus further includes a locking mechanism configured to facilitate locking of the inner tube in a fixed position with respect to the outer tube.
For some applications, the first expandable element includes a balloon that is flared in a distal direction.
For some applications, a distal surface of the first expandable element is concave in the distal direction.
For some applications, the second expandable element includes a balloon that is flared in a distal direction.
For some applications, a proximal surface of the second expandable element is convex in a proximal direction.
For some applications, the first expandable element includes a suction cup.
For some applications, the suction cup is configured to assume a curved shape in which a proximal portion of the suction cup is concave in a distal direction, and a distal portion of the suction cup is convex in the distal direction.
For some applications, a distal edge of the suction cup is thickened with respect to other portions of the suction cup.
For some applications, the suction cup is configured to be in a folded configuration during insertion of the suction cup through the trocar, the apparatus including a sheath configured to maintain the suction cup in the folded configuration during the insertion, the suction cup being configured to automatically assume an expanded configuration upon being pushed distally to the sheath.
For some applications, the suction cup includes portions thereof that include a shape-memory alloy, the portions being configured to perform at least one function selected from the group consisting of: causing the suction cup to assume the expanded configuration upon being pushed distally to the sheath, and preventing the suction cup from folding upon being pushed against a surface of the subject's body.
For some applications, the distal end of the inner tube is configured to be placed inside a heart of the subject, and provide a working channel from outside the subject's skin to inside the subject's heart.
For some applications, the distal end of the inner tube is configured to be inserted into the subject's heart via a passage in the subject's heart, the first expandable element is configured to seal the cannula with respect to an outer surface of the heart at the passage, and the second expandable element is configured to seal the cannula with respect to an inner surface of the heart at the passage.
There is further provided, in accordance with some applications of the present invention, apparatus for use with an insertion device, the apparatus including a closure device, the closure device including:
a plug portion configured to be placed within a passage in a wall of a heart of a subject by being introduced to the passage via the insertion device, the insertion device being configured to maintain the plug portion in a constrained state thereof during the insertion, the plug portion being configured to automatically increase a radius of the plug portion by more than 0.5 percent by assuming a non-constrained state thereof by being pushed out of a distal end of the insertion device;
an intracardiac portion, coupled to the plug portion, and configured for placement within a heart chamber; and
an extracardiac portion coupled to the plug portion and configured for placement outside of the heart chamber.
For some applications, the plug portion includes a soft outer layer thereof.
For some applications, a radius of the passage is defined by an outer radius of the insertion device, while the plug portion is in the constrained state thereof, the radius of the plug portion is less than the outer radius of the insertion device, and upon assuming the non-constrained state thereof, the radius of the plug portion is at least equal to the outer radius of the insertion device.
For some applications, upon assuming the non-constrained state thereof, the plug portion is configured to seal the passage by expanding to occupy the passage.
For some applications, the plug portion is configured to automatically increase the radius of the plug portion by more than 5 percent upon assuming the non-constrained state thereof, by being pushed out of a distal end of the insertion device.
For some applications, the plug portion is configured to automatically increase the radius of the plug portion by less than 100 percent upon assuming the non-constrained state thereof, by being pushed out of a distal end of the insertion device.
For some applications, the plug portion is configured to increase the radius of the plug portion even in an absence of any radial expansion of the plug portion that is due to absorbance of fluid by the plug portion.
For some applications, the plug portion is configured to further expand upon being placed inside the passage by absorbing fluid while the plug portion is within the passage.
For some applications, the extracardiac portion is shaped to define a disc that is convex in a distal direction.
For some applications, the plug portion is configured, in the absence of any force applied to the plug portion, to reduce a length of the plug portion by 0.5-50 percent.
For some applications, the apparatus further includes an element, configured to draw the intracardiac portion and the extracardiac portion closer to each other.
For some applications, the plug portion is bioabsorbable or biodegradable.
For some applications, more than 50 percent of a non-constrained volume of the plug portion includes an expansible material.
For some applications, the plug portion is configured to facilitate insertion of a device therethrough, into the subject's heart, by the device being advanced through a hole in the plug portion, and the plug portion is configured to automatically seal the passage in the heart subsequent to removal of the device, by the plug portion expanding to seal the hole in the plug portion.
For some applications, the intracardiac portion is shaped to define a disc that is concave in a distal direction.
For some applications, the extracardiac portion is shaped to define a disc that is concave in the distal direction.
For some applications, a radius of curvature of the extracardiac portion is less than a radius of curvature of the intracardiac portion.
For some applications, the intracardiac portion, the extracardiac portion and the plug portion are moveable with respect to each other.
For some applications, the closure device is configured to conform with anatomical variations of the subject's heart, by the intracardiac portion, the extracardiac portion and the plug portion being moveable with respect to each other.
For some applications, the closure device is configured to seal the passage in the wall of the heart by being placed inside the passage, and the closure device is configured to maintain the seal of the passage, by the intracardiac portion, the extracardiac portion and the plug portion being moveable with respect to each other.
For some applications, the intracardiac portion and the extracardiac portion of the closure device are configured to be maintained in folded configurations thereof during insertion of the closure device via the insertion device, and the intracardiac portion and the extracardiac portion are configured to automatically assume unfolded states thereof by being pushed out of the distal end of the insertion device.
For some applications, the intracardiac portion and the extracardiac portion include a shape memory material that is configured to cause the intracardiac portion and the extracardiac portion to automatically assume the unfolded states.
For some applications, the plug portion is configured to increase the radius of the plug portion upon absorbing body fluid.
For some applications, the plug portion is configured to reduce the length of the plug portion by 0.5-50 percent, upon absorbing the body fluid.
There is additionally provided, in accordance with some applications of the present invention, apparatus for use with an insertion device, the apparatus including a closure device, the closure device including:
a support element configured to be placed within a passage in a wall of a heart of a subject by being introduced to the passage while coupled to the insertion device, and to become decoupled from the insertion device subsequent to placement of the support element within the passage;
an inflatable intracardiac portion, coupled to the support element, and configured to be inflated within a heart chamber; and
an inflatable extracardiac portion coupled to the support element, and configured to be inflated outside of the heart chamber.
For some applications, the support element defines a lumen therethrough and the closure device includes at least one hemostatic valve disposed within the lumen.
For some applications, the support element defines a lumen therethrough and the closure device includes a plug configured to be placed within the lumen such as to seal the lumen.
For some applications, the apparatus further includes a thermosetting material that changes from a fluid state to a solid state thereof, the inflatable intracardiac portion is configured to be inflated with the material while the material is in the fluid state thereof, and the material is configured to change to the solid state thereof while the material is within the intracardiac portion.
For some applications, the apparatus further includes a material that changes from a fluid state to a solid state thereof, the inflatable extracardiac portion is configured to be inflated with the material while the material is in the fluid state thereof, and the material is configured to change to the solid state thereof while the material is within the extracardiac portion.
There is further provided, in accordance with some applications of the present invention, apparatus including a closure device, the closure device including:
a plug portion configured for placement within a passage in a wall of a heart of a subject;
an intracardiac portion, coupled to the plug portion, and configured for placement within a heart chamber, and having a radius of curvature; and
an extracardiac portion coupled to the plug portion and configured for placement outside of the heart chamber, having a radius of curvature that is less than the radius of curvature of the intracardiac portion.
There is additionally provided, in accordance with some applications of the present invention, apparatus including a kit including:
a longitudinal element, configured to extend through a peripheral blood vessel of a subject, to transvascularly reach a heart of the subject, and to transmurally pass out of a passage in the heart of the subject and reach skin of the subject via a path extending from the heart to the skin, the longitudinal element including:
For some applications, the first and second portions are coupled to each other in the kit.
For some applications, the kit further includes a connection element, which couples a proximal end of the distal portion to a distal end of the proximal portion.
For some applications, the connection element includes a crimping tube.
For some applications, the connection element includes a friction-based connection element.
There is further provided, in accordance with some applications of the present invention, apparatus including:
a catheter including a proximal portion and a distal portion, the catheter being advanceable through a peripheral blood vessel into a left ventricle of a heart of a subject; and
an expandable structure coupled to the distal end of the catheter and configured to expand such that the expandable structure assumes an expanded state thereof within the left ventricle in a vicinity of an apex of the left ventricle, such that a distal end of the expandable structure protrudes distally from the distal end of the catheter.
For some applications, the expandable structure is configured to expand within the left ventricle such that the distal end of the catheter is maintained at a distance from the apex of the left ventricle.
For some applications, the expandable structure is shaped to define a mesh.
For some applications, the expandable structure includes a balloon.
For some applications, the balloon defines bulges on an outer surface thereof, the bulges being configured to generate friction between the outer surface of the balloon and an inner wall of the heart at the apex.
For some applications, the expandable structure includes a metal.
For some applications, the expandable structure includes nitinol.
For some applications, the apparatus further includes a puncturing tool, passable through the catheter, and configured to puncture the apex.
For some applications, the expandable structure is configured to seal the puncture in the apex.
For some applications, the distal end of the catheter is steerable, and the expandable structure provides a space in which the distal end of the catheter can steer while not contacting the apex.
For some applications, the apparatus further includes a puncturing tool, passable through the catheter, and configured to extend from within the space provided by the expandable structure and puncture the apex.
For some applications, the expandable structure is configured to seal the puncture in the apex.
There is additionally provided, in accordance with some applications of the present invention, apparatus including:
a catheter including a proximal portion and a distal portion, the distal portion including:
There is further provided, in accordance with some applications of the present invention, apparatus including a kit, the kit including:
at least one hollow surgical needle that is flexible in one region thereof and less flexible at another region thereof.
For some applications, the region that is flexible is shaped to define one or more slits therein, which facilitate the flexibility of the region.
For some applications, the less flexible region of the hollow surgical needle is substantially inflexible.
For some applications, the kit includes a suture, passable through the hollow surgical needle.
For some applications, the at least one hollow surgical needle includes 2-8 hollow surgical needles.
For some applications, the 2-8 hollow surgical needles include 3-5 hollow surgical needles.
For some applications, the needle is configurable to have a J-shape.
For some applications, a sharp distal tip of the J-shaped needle points in a direction that is parallel to a straight portion of the J-shaped needle.
For some applications, a smallest radius of curvature along the J-shaped needle is 1-8 mm.
For some applications, a length of a post-curve distal region of the J-shaped needle is 3-200 mm.
For some applications, a length of a post-curve distal region of the J-shaped needle is 10-20 mm.
For some applications, a distance between a straight portion of the needle and a distal sharp tip of the needle is 2-15 mm.
There is further provided, in accordance with some applications of the present invention, a method including:
advancing a longitudinal element, through a peripheral blood vessel, to a chamber of a heart of a subject;
creating a passage in a wall of the heart; and
passing the longitudinal element through the passage, out of the heart, and through skin of the subject, such that the longitudinal element extends in a path from the heart to the skin.
For some applications, the method further includes advancing a catheter through the blood vessel, and advancing the longitudinal element includes advancing the longitudinal element through the catheter after the catheter has been advanced through the blood vessel.
For some applications, the longitudinal element includes a guidewire, and advancing the longitudinal element includes advancing the guidewire.
For some applications, passing the longitudinal element through the skin includes pulling the longitudinal element through the skin.
For some applications, passing the longitudinal element through the skin includes pushing the longitudinal element through the skin.
For some applications, the method further includes passing a tool over the longitudinal element, toward the heart, on the path extending from the heart to the skin.
For some applications, the method further includes passing a tool over the longitudinal element, from the peripheral blood vessel, to the chamber of the heart.
For some applications, the method further includes passing an additional tool over the longitudinal element, toward the heart, on the path extending from the heart to the skin.
For some applications, the method further includes utilizing the additional tool in conjunction with the tool passed from the peripheral blood vessel to the chamber of the heart.
For some applications, the method further includes coupling the additional tool to the tool passed from the peripheral blood vessel to the chamber of the heart.
There is further provided, in accordance with some applications of the present invention, a method including:
advancing a catheter, through a peripheral blood vessel, to a chamber of a heart of a subject;
passing a longitudinal element through the catheter;
creating a passage in a wall of the heart, from within the chamber of the heart;
passing the longitudinal element through the passage, out of the heart, and through skin of the subject, such that the longitudinal element extends from the heart to the skin; and
subsequently, passing a tool into the heart over the longitudinal element.
For some applications, the method further includes passing a dilator from the skin over the longitudinal element, and enlarging a path to the heart using the dilator.
For some applications, creating the passage in the wall of the heart includes puncturing the wall of the heart with a needle.
For some applications, advancing the catheter includes advancing the catheter over an angiographic guidewire.
For some applications, passing the longitudinal element through the passage out of the heart includes advancing the longitudinal element through the passage out of the heart.
For some applications, passing the longitudinal element through the passage out of the heart includes pulling the longitudinal element through the passage out of the heart.
For some applications, the longitudinal element includes a guidewire and the method includes passing the guidewire through the catheter.
For some applications, the longitudinal element includes a second catheter and the method further includes passing the second catheter through the catheter.
For some applications, the tool includes a cannula, and passing the tool into the heart includes passing the cannula into the heart over the longitudinal element.
For some applications, passing the cannula into the heart over the longitudinal element includes:
placing an outer tube of the cannula against on outer surface of the heart, the outer tube having a first expandable element disposed at a distal end thereof; and
placing an inner tube of the cannula inside the heart, the inner tube having a second expandable element disposed at a distal end thereof, the inner tube being configured to be slidable with respect to the outer tube.
For some applications, the method further includes generating a vacuum between the first expandable element and an outer surface of the wall of the heart by applying vacuum pressure via a space between the inner and outer tubes of the cannula.
For some applications, passing the cannula into the heart over the longitudinal element includes:
placing a trocar between ribs of the subject, the trocar defining a lumen therethrough, and
inserting the cannula through the lumen defined by the trocar.
For some applications, the method further includes sealing an inner surface of the wall of the heart by sliding the inner tube of the cannula proximally with respect to the outer tube, such that the second expandable element is placed in contact with the inner surface of the wall of the heart.
For some applications, the method further includes locking a position of the inner tube with respect to the outer tube, subsequent to the placement of the second expandable element in contact with the inner surface of the wall of the heart.
For some applications, a balloon is coupled to a distal end of the cannula, and the method further includes:
inflating the balloon while the balloon is in the heart; and
pulling a proximal end of the cannula in a direction that is away from the body of the subject, such that the heart is pulled towards a chest wall of the subject.
For some applications, the method further includes advancing a prosthetic valve through the cannula.
For some applications, advancing the catheter through a peripheral blood vessel includes advancing the catheter through an artery.
For some applications, advancing the catheter includes advancing the catheter through a femoral artery.
For some applications, advancing the catheter includes advancing the catheter through a radial artery.
For some applications, advancing the catheter through a peripheral blood vessel includes advancing the catheter through a vein.
For some applications, advancing the catheter includes advancing the catheter through a femoral vein.
For some applications, advancing the catheter includes advancing the catheter through a radial vein.
For some applications, creating the passage in the wall of the heart includes puncturing the wall of the heart with the longitudinal element.
For some applications, passing the longitudinal element through the catheter includes passing a longitudinal element having a pointed tip through the catheter.
There is additionally provided, in accordance with some applications of the present invention, a method including:
advancing a catheter into a body lumen of a subject;
passing through the catheter, a guidewire having proximal and distal ends thereof, the distal end having a straight configuration while being passed through the catheter;
creating a passage in a wall of the body lumen from within the lumen;
advancing the guidewire through the passage, out of the lumen, such that the distal end of the guidewire assumes a curved configuration upon exiting the lumen;
passing the guidewire through skin of the subject, such that the guidewire extends from the wall of the body lumen to the skin; and
subsequently, passing a tool into the body lumen over the guidewire.
For some applications, the body lumen includes a heart chamber of the subject, and advancing the catheter into the body lumen includes advancing the catheter into the heart chamber.
For some applications, the method further includes rotating the distal end of the guidewire while the guidewire is outside the heart chamber.
For some applications, the method further includes operating a magnet to rotate the distal end of guidewire while the guidewire is outside the heart chamber.
There is further provided, in accordance with some applications of the present invention, a method including:
advancing a guidewire into a chamber of a heart of a subject;
creating a passage in a wall of the heart, from within the chamber of the heart;
passing the guidewire through the passage, out of the heart, and through skin of the subject, such that the guidewire extends from the heart to the skin;
subsequently, passing a closure device into the heart over the guidewire to seal the passage in the wall of the heart, the closure device including:
inserting the closure device through the passage such that the intracardiac portion and the extracardiac portions apply a force to the plug portion to maintain the plug portion in place within the passage.
For some applications, the plug portion includes an intramural plug portion and passing a closure device into the heart includes passing the intramural plug portion into the heart.
For some applications, inserting the closure device through the passage includes introducing the insertion device to the passage via an insertion device, the insertion device being configured to maintain the plug portion in a constrained state thereof during the insertion, the plug portion being configured to automatically increase a radius of the plug portion by more than 0.5 percent by assuming a non-constrained state thereof by being pushed out of a distal end of the insertion device.
There is further provided, in accordance with some applications of the present invention, apparatus, for use with a self-expandable device that is configured to be deployed by self-expanding inside a body of a subject, the apparatus including:
an insertion device that includes an outer tube and an inner pushing element,
a safety element that is couplable to the pushing element and that is configured to prevent distal advancement of the pushing element with respect to the outer tube, when the safety element is coupled to the pushing element.
For some applications, the self-expandable device includes a hole closure device configured to close a hole in a wall of the subject's heart, the hole closure device including an intracardiac portion configured to be placed in contact with an inner wall of the subject's heart, and the safety element is configured to prevent the intracardiac portion of the hole closure device from being expanded before the intracardiac portion is disposed inside the heart.
For some applications, when the intracardiac portion is in the heart, the safety element is configured to be decoupled from the pushing element, and the pushing element is configured to cause the intracardiac portion of the hole closure device to self expand by pushing the intracardiac portion of the hole closure device out of a distal end of the outer tube, by the pushing element being advanced distally with respect to the outer tube.
For some applications,
the hole closure device further includes a plug portion configured to be placed in the hole in the wall of the subject's heart,
the safety element has a given length, and, while coupled to the pushing element, the safety element is configured to prevent advancement of the pushing element with respect to the outer tube through the given length, and
the insertion device is configured such that, subsequent to decoupling the safety element from the pushing element, by advancing the pushing element with respect to the outer tube through the given length, the intracardiac portion of the hole closure device is pushed out of the distal end of the outer tube and at least a portion of the plug portion of the hole closure device remains inside the outer tube.
For some applications, the length of the safety element is greater than 5 mm.
For some applications, the length of the safety element is greater than 15 mm.
For some applications, the length of the safety element is less than 30 mm.
For some applications, the length of the safety element is less than 20 mm.
There is further provided, in accordance with some applications of the present invention, a method, for use with a self-expandable device that is configured to be deployed by self-expanding inside a body of a subject, the method including:
advancing the self-expandable device toward a deployment location of the device while the device is maintained in a constrained state thereof within an outer tube of an insertion device,
For some applications,
the self-expandable device includes a hole closure device configured to close a hole in a wall of the subject's heart, the hole closure device including an intracardiac portion configured to be placed in contact with an inner wall of the subject's heart, and
causing at least a portion of the self-expandable device to self expand includes, when the intracardiac portion is in the heart, causing the intracardiac portion of the hole closure device to self expand by pushing the intracardiac portion of the hole closure device out of the distal end of the outer tube, by advancing the pushing element distally with respect to the outer tube.
For some applications,
the hole closure device further includes a plug portion configured to be placed in the hole in the wall of the subject's heart,
the safety element includes a safety element having a given length, and
advancing the pushing element distally with respect to the outer tube includes pushing the intracardiac portion of the hole closure device out of the distal end of the outer tube leaving at least a portion of the plug portion of the hole closure device inside the outer tube, by advancing the pushing element distally with respect to the outer tube through the given length.
There is additionally provided, in accordance with some applications of the present invention, apparatus, including:
a hole closure device that defines a plug portion configured to be placed within a passage in a wall of the subject's heart, such that the plug portion at least partially seals the passage; and
a second device configured to be implanted within the subject's heart, the second device being coupled to the hole closure device, such that the hole closure device, upon having been placed within the passage in the subject's heart wall, anchors the second device within the subject's heart.
For some applications, the hole closure device further defines an intracardiac portion, coupled to the plug portion, and configured for placement within a heart chamber, and an extracardiac portion coupled to the plug portion and configured for placement outside of the heart chamber.
For some applications, the plug portion of the hole closure device is configured to be placed in a passage in an apex of the subject's heart, and the second device is configured to be implanted within a left ventricle of the subject's heart by being inserted through the passage in the apex of the subject's heart.
For some applications, the second device includes a left-ventricular partitioning device configured to be expanded within the subject's left ventricle such as to partition a portion of the left ventricle from a remainder of the left ventricle.
For some applications, the left-ventricular partitioning device is shaped to define a concave disc.
For some applications, a diameter of the disc is greater than 20 mm.
For some applications, the diameter of the disc is greater than 40 mm.
For some applications, a diameter of the disc is less than 100 mm.
For some applications, the diameter of the disc is less than 80 mm.
There is further provided, in accordance with some applications of the present invention, a method including:
providing a hole closure device defining a plug portion thereof, and a second device coupled to the hole closure device; and
anchoring the second device within a heart of a subject, and at least partially sealing a passage in a wall of the subject's heart, by placing the plug portion of the hole closure device within the passage in a wall of the subject's heart.
For some applications, the hole closure device includes an intracardiac portion and an extracardiac portion, the intracardiac and extracardiac portion being coupled to the plug portion, and anchoring the second device within the subject's heart further includes placing the intracardiac portion on an intracardiac side of the passage through the wall of the subject's heart, and placing the extracardiac portion on an extracardiac side of the passage through the wall of the subject's heart.
For some applications,
the passage includes a passage in an apex of the subject's heart;
the method further includes inserting the second device into a left ventricle of the subject's heart via the passage in the apex of the subject's heart;
placing the plug portion of the hole closure device within the passage includes placing the plug portion of the hole closure device within the passage in the apex of the subject's heart; and
anchoring the second device within the subject's heart includes anchoring the second device within the left ventricle of the subject's heart.
For some applications, the second device includes a left-ventricular partitioning device, inserting the second device into the subject's left ventricle includes inserting the left-ventricular partitioning device into the subject's left ventricle while the left-ventricular partitioning device is in a constrained state thereof, and the method further includes partitioning a portion of the left ventricle from a remainder of the left ventricle by expanding the left-ventricular partitioning device inside the left ventricle.
For some applications, expanding the left-ventricular partitioning device includes expanding the left-ventricular partitioning device to form a concave disc.
For some applications, expanding the left-ventricular partitioning device includes expanding the left-ventricular partitioning device to form a disc having a diameter greater than 20 mm.
For some applications, expanding the left-ventricular partitioning device includes expanding the left-ventricular partitioning device to form a disc having a diameter greater than 40 mm.
For some applications, expanding the left-ventricular partitioning device includes expanding the left-ventricular partitioning device to form a disc having a diameter less than 100 mm.
For some applications, expanding the left-ventricular partitioning device includes expanding the left-ventricular partitioning device to form a disc having a diameter less than 80 mm.
There is additionally provided, in accordance with some applications of the present invention, apparatus including:
a medical device configured to be deployed inside a body of a subject;
a flexible elongate element configured to be coupled to the device, at least during deployment of the device; and
a coupling element configured to couple the flexible elongate element to the medical device, the coupling element being configured:
For some applications, the elongate element includes a wire.
For some applications, the coupling element includes a suture.
For some applications, the coupling element includes a mechanical fuse.
For some applications, the coupling element is configured to break in response to a force of more than 6 N being applied to the coupling element by the flexible elongate element.
For some applications, the coupling element is configured not to break in response to a force of less than 4 N being applied to the coupling element by the flexible elongate element.
For some applications, the coupling element, by not breaking in response to a force of less than 2 N being applied to the coupling element by the flexible elongate element, is configured to facilitate prevention of the medical device from distally migrating during deployment of the medical device inside the subject's body, by a healthcare professional holding a proximal end of the elongate element during the deployment of the medical device.
For some applications, the coupling element, by breaking in response to a force of more than 8 N being applied to the coupling element by the flexible elongate element, is configured to prevent the medical device from being pulled proximally from a deployment location of the medical device, in response to a force of more than 8N being applied to the coupling element via the elongate element.
For some applications, the medical device includes a hole closure device configured to close a passage in an apex of a subject's heart by being placed at least partially inside the passage.
For some applications, the coupling element includes a suture that is sutured to a proximal portion of the hole closure device, and the elongate element includes a wire configured to be doubled by being threaded through the suture.
For some applications, a length of the doubled wire is at least 32 mm.
There is further provided, in accordance with some applications of the present invention, a method including:
inserting a medical device into a body of a subject; and
during the insertion, holding a proximal end of a flexible elongate element outside of the subject's body,
the flexible elongate element being coupled to the medical device via a coupling element, the coupling element being configured:
For some applications, the elongate element includes a wire, and holding the proximal end of the elongate element includes holding a proximal end of the wire.
For some applications, the coupling element includes a suture, and holding the proximal end of the elongate element includes holding the proximal end of the elongate element, the elongate element being coupled to the medical device via the suture.
For some applications, holding the proximal end of the elongate element includes holding the proximal end of the elongate element, the elongate element being coupled to the medical device via the coupling element, the coupling element being configured to break in response to a force of more than 6 N being applied to the coupling element by the flexible elongate element.
For some applications, holding the proximal end of the elongate element includes holding the proximal end of the elongate element, the elongate element being coupled to the medical device via the coupling element, the coupling element being configured not to break in response to a force of less than 4 N being applied to the coupling element by the flexible elongate element.
For some applications, holding the proximal end of the elongate element, the elongate element being coupled to the medical device via the coupling element, the coupling element being configured not to break in response to a force of less than 2 N being applied to the coupling element by the flexible elongate element includes preventing the medical device from distally migrating during deployment of the medical device inside the subject's body, by holding the proximal end of the elongate element during the deployment of the medical device.
For some applications, holding the proximal end of the elongate element, the elongate element being coupled to the medical device via the coupling element, the coupling element being configured to break in response to a force of more than 8 N being applied to the coupling element by the flexible elongate element includes preventing the medical device from being pulled proximally from a deployment location of the medical device, in response to a force of more than 8N being applied to the medical device via the elongate element.
For some applications, the medical device includes a hole closure device, and inserting the medical device includes closing a passage in an apex of a heart of a subject by placing the hole closure device at least partially inside the passage.
For some applications, the coupling element includes a suture that is sutured to a proximal portion of the hole closure device, and holding a proximal end of the elongate element includes holding ends of a wire that has been doubled by being threaded through the suture.
For some applications, holding the ends of the doubled wire includes holding the ends of the doubled wire the doubled wire having a length of at least 32 mm.
There is additionally provided, in accordance with some applications of the present invention, a method for use with a guidewire that has been inserted into a body of a subject, the method including:
inserting into the subject's body a tube and a wire loop disposed at a distal end of the tube; and
while the tube and the wire loop are disposed inside the subject's body:
For some applications, using the wire loop to ensnare the guidewire includes placing the loop around the guidewire, and ensnaring the guidewire, by retracting the loop into the tube.
For some applications, using the tube and the wire loop to separate portions of tissue of the subject from each other includes partially retracting the loop into the tube, and, while the loop is partially retracted into the tube, using the loop and the tube to separate the portions of the subject's tissue from each other.
There is further provided, in accordance with some applications of the present invention, apparatus for use with a tool that is configured for placement inside a heart of a subject, and a hole closure device that defines a plug portion configured to be placed within a passage in a wall of the subject's heart, such that the plug portion at least partially seals the passage, the apparatus including:
a blade configured to cut through the plug portion such as to facilitate insertion of the tool through the plug portion; and
a protective structure configured to be placed within the subject's heart, such that upon the blade penetrating through the plug portion, the blade is disposed within the protective structure, the protective structure thereby protecting tissue of the heart from being injured by the blade.
For some applications, the protective structure includes a slitted tube, the slitted tube being expandable within the subject's heart, such as to form a cage structure.
There is additionally provided, in accordance with some applications of the present invention, a method for use with a tool that is configured for placement inside a heart of a subject, and a hole closure device that defines a plug portion configured to be placed within a passage in a wall of the subject's heart, such that the plug portion at least partially seals the passage, the method including:
inserting a protective structure into the subject's heart via the plug portion; and
subsequently, cutting through the plug portion such as to facilitate insertion of the tool through the plug portion,
the inserting of the protective structure being performed such that, upon penetrating through the plug portion, the blade is disposed within the protective structure, the protective structure thereby protecting tissue of the heart from being injured by the blade.
For some applications, inserting the protective structure into the heart includes inserting into the heart a slitted tube, and forming a cage structure from the slitted tube, by radially expanding the slitted tube.
There is further provided, in accordance with some applications of the present invention, apparatus for ensnaring an object inside a portion of a body of a subject, the apparatus including:
a snare including a rigid tube and a wire loop disposed at the distal end of the rigid tube; and
a medical tool coupled to a distal portion of the rigid tube and configured to perform a function with respect to the portion of the subject's body.
For some applications, the snare is configured to ensnare the object by the loop being placed around the object, and the loop being retracted into the tube.
For some applications, the medical tool includes an expandable element.
For some applications, the expandable element includes a balloon.
For some applications, the expandable element is configured to generate a hollow space in the vicinity of the object that is to be ensnared by separating portions of tissue of the subject's body within the portion of the subject's body.
For some applications, the expandable element is configured, when in an expanded state thereof, to protrude from the distal end of the rigid tube and to prevent the distal end of the rigid tube from contacting tissue of the subject's body.
There is further provided, in accordance with some applications of the present invention, apparatus, for use with a self-expandable hole closure device that is configured to be deployed by self-expanding inside a body of a subject, the apparatus including:
an insertion device that includes an outer tube and an inner pushing element,
a safety element that is couplable to the pushing element and that is configured to prevent the self-expandable hole closure device from expanding, by preventing distal advancement of the pushing element with respect to the outer tube, when the safety element is coupled to the pushing element.
For some applications, the self-expandable hole closure device includes a hole closure device configured to close a hole in a wall of the subject's heart, the hole closure device including an intracardiac portion configured to be placed in contact with an inner wall of the subject's heart, and the safety element is configured to prevent the intracardiac portion of the hole closure device from being expanded before the intracardiac portion is disposed inside the heart.
For some applications, when the intracardiac portion is in the heart, the safety element is configured to be decoupled from the pushing element, and the pushing element is configured to cause the intracardiac portion of the hole closure device to self expand by pushing the intracardiac portion of the hole closure device out of a distal end of the outer tube, by the pushing element being advanced distally with respect to the outer tube.
For some applications:
the hole closure device further includes a plug portion configured to be placed in the hole in the wall of the subject's heart,
the safety element has a given length, and, while coupled to the pushing element, the safety element is configured to prevent advancement of the pushing element with respect to the outer tube through the given length, and
the insertion device is configured such that, subsequent to decoupling the safety element from the pushing element, by advancing the pushing element with respect to the outer tube through the given length, the intracardiac portion of the hole closure device is pushed out of the distal end of the outer tube and at least a portion of the plug portion of the hole closure device remains inside the outer tube.
For some applications, the length of the safety element is greater than 5 mm.
For some applications, the length of the safety element is greater than 15 mm.
For some applications, the length of the safety element is less than 30 mm.
For some applications, the length of the safety element is less than 20 mm.
There is additionally provided, in accordance with some applications of the present invention, a method, for use with a self-expandable hole closure device that is configured to be deployed by self-expanding inside a body of a subject, the method including:
advancing the self-expandable hole closure device toward a deployment location of the device while the device is maintained in a constrained state thereof within an outer tube of an insertion device,
For some applications:
the self-expandable hole closure device includes a hole closure device configured to close a hole in a wall of the subject's heart, the hole closure device including an intracardiac portion configured to be placed in contact with an inner wall of the subject's heart, and
causing at least a portion of the self-expandable hole closure device to self expand includes, when the intracardiac portion is in the heart, causing the intracardiac portion of the hole closure device to self expand by pushing the intracardiac portion of the hole closure device out of the distal end of the outer tube, by advancing the pushing element distally with respect to the outer tube.
For some applications:
the hole closure device further includes a plug portion configured to be placed in the hole in the wall of the subject's heart,
the safety element includes a safety element having a given length, and
advancing the pushing element distally with respect to the outer tube includes pushing the intracardiac portion of the hole closure device out of the distal end of the outer tube leaving at least a portion of the plug portion of the hole closure device inside the outer tube, by advancing the pushing element distally with respect to the outer tube through the given length.
There is further provided, in accordance with some applications of the present invention, apparatus including:
a self-expandable hole closure device configured to close a hole in a wall of a heart of a subject by self-expanding, the hole closure device including at least:
an insertion device including:
the apparatus including at least first and second motion-impeding mechanisms configured to impede distal advancement of the pushing element with respect to the outer tube.
For some applications:
the first motion-impeding mechanism includes a safety element that is couplable to the insertion device and that is configured, while coupled to the insertion device, to prevent the extracardiac portion of the hole closure device from being expanded, by preventing distal advancement of the pushing element with respect to the outer tube; and
the second motion-impeding mechanism includes a portion of the insertion device defining a threaded outer surface configured such that the handle of the pushing element is advanceable over the portion only by being screwed around the threaded outer surface.
For some applications:
the first motion-impeding mechanism includes a first safety element that is couplable to the insertion device and that is configured, while coupled to the insertion device, to prevent the intracardiac portion of the hole closure device from being expanded, by preventing distal advancement of the pushing element with respect to the outer tube; and
the second motion-impeding mechanism includes a second safety element that is couplable to the insertion device and that is configured, while the first safety element is not coupled to the insertion device, and while the second safety element is coupled to the insertion device, to prevent the extracardiac portion of the hole closure device from being expanded, by preventing distal advancement of the pushing element with respect to the outer tube.
For some applications, the apparatus includes at least first, second, and third motion-impeding mechanisms configured to impede distal advancement of the pushing element with respect to the outer tube.
For some applications:
the first motion-impeding mechanism includes a first safety element that is couplable to the insertion device and that is configured, while coupled to the insertion device, to prevent the intracardiac portion of the hole closure device from being expanded, by preventing distal advancement of the pushing element with respect to the outer tube;
the second motion-impeding mechanism includes a second safety element that is couplable to the insertion device and that is configured, while the first safety element is not coupled to the insertion device, and while the second safety element is coupled to the insertion device, to prevent the extracardiac portion of the hole closure device from being expanded, by preventing distal advancement of the pushing element with respect to the outer tube; and
the third motion-impeding mechanism includes a portion of the insertion device defining a threaded outer surface configured such that the handle of the pushing element is advanceable over the portion only by being screwed around the threaded outer surface.
There is additionally provided, in accordance with some applications of the present invention, apparatus including:
a self-expandable hole closure device configured to close a hole in a wall of a heart of a subject by self-expanding, the hole closure device including at least:
an insertion device including:
For some applications, the insertion device is configured such advancing the handle of the pushing element over the portion of the insertion device that defines the threaded outer surface causes the extracardiac portion of the hole closure device to self expand by being advanced out of the distal end of the outer tube.
For some applications, the apparatus further includes a safety element that is couplable to the insertion device and that is configured, while coupled to the insertion device, to prevent the extracardiac portion of the hole closure device from being expanded, by preventing distal advancement of the pushing element with respect to the outer tube.
For some applications, the safety element is configured to be coupled to the insertion device by being coupled to the portion of the insertion device that defines the threaded outer surface.
The present invention will be more fully understood from the following detailed description of applications thereof, taken together with the drawings, in which:
Reference is made to
In Step 1 of the procedure, a guidewire 10 is inserted through a peripheral blood vessel (e.g., the radial artery or the femoral artery, as shown) to apex 6 of the subject's left ventricle 4. For example, the guidewire may be a 0.089 cm (0.035 inch) soft and flexible guidewire. Alternatively, the guidewire may be a different size, for example, the guidewire may be a 0.08 cm (0.032 inch) guidewire. For some applications, the guidewire is an angiographic guidewire. As described hereinbelow, for some applications, the stiffness of the guidewire varies along the length of the guidewire.
In Step 2 of the procedure, when a distal portion of the guidewire is positioned at the apex, a catheter 12 is advanced over the guidewire. It is noted that catheter 12 is shown as a femoral catheter by way of illustration and not limitation. Catheter 12, as described herein in the specification and in the claims may be advanced to the heart through any suitable blood vessel, for example, through the radial artery. Catheter 12 is advanced over the guidewire to a desired location within the chamber of the heart. For some applications, catheter 12 comprises a 4-14 Fr catheter, e.g., a 4-9 Fr catheter. (The units of “Fr” are defined as Diameter (mm)=Fr/3, thus 9 Fr=3 mm.) Typically, the catheter is advanced over the guidewire through the femoral artery, toward the heart, in a retrograde direction, up the aorta and across the aortic valve into the left ventricle. Depending on the state of the native aortic valve, the surgeon may dilate the valve, prior to advancing the catheter into the left ventricle. For some applications, the catheter is inserted through the femoral vein, into the right atrium. The catheter is then passed from the right atrium through the left atrium via the interatrial septum, and then into the left ventricle via the mitral valve, in accordance with techniques that are known in the art.
In Step 3 of the procedure, a protective, fixation, and/or locating structure 30 at the distal end of catheter 12 positions and/or fixates the distal end of the catheter at apex 6 of left ventricle 4. Protective, fixation, and/or locating structure 30 is described in more detail hereinbelow with reference to
For some applications, subsequent to placement of structure 30 at the apex, the position of the proximal end of catheter 12 is fixed with respect to the femoral access point of catheter 12, for example, by locking the proximal end of catheter 12 with respect to the femoral access point using a locking mechanism. For some applications, the locking mechanism includes a collet (not shown). The collet is configured to lock catheter 12 with respect to the femoral access point, while allowing movement of guidewire 10 with respect to catheter 12. Alternatively or additionally, the collet is configured to lock catheter 12 with respect to the femoral access point, while allowing inflation fluid to be supplied, via the catheter, to a balloon that is disposed at the distal end of the catheter, e.g., a balloon that is used for structure 30 as described hereinbelow. For some applications, catheter 12 is a standard (e.g., an off-the-shelf) catheter, and the locking mechanism is coupled to the catheter, e.g., by being snapped onto the catheter.
In Step 4 of the procedure, a trocar 40 (
In Step 5 of the procedure, subsequent to the distal end of the catheter being positioned and/or fixated at apex 6 of left ventricle 4, a hole is pierced through the apex. For example, an inner catheter having a sharp tip (e.g., catheter 33, shown in
Step 6 is shown in
It is noted that, as an alternative to performing Steps 4-6 (i.e., inserting trocar 40 through the subject's ribs, and grasping the distal end of the guidewire with grasping element 50), for some applications, the distal end of the guidewire is guided through the chest cavity, to a location between the subject's ribs. A hole is pierced in the subject's chest wall, between the subject's ribs, from inside the subject's chest cavity (e.g., using an inner catheter having a pointed tip, such as catheter 33 shown in
As a further alternative to performing Steps 4-6, for some applications, grasping element 50 is inserted into the subject's chest cavity in the absence of a trocar. For example, the grasping element may be inserted into the subject's chest cavity via a 4-6 Fr catheter. For some applications, trocar 40 is inserted through the subject's chest wall at a subsequent step of the procedure. For example, subsequent to the guidewire being pulled out of the subject's chest, the trocar may be inserted through the subject's ribs with a dilator, by the trocar and the dilator being advanced over the guidewire. For some applications, the grasping element is inserted into the subject's chest cavity through a first smaller-diameter trocar (e.g., a trocar having a diameter of more than 1 mm and/or less than 7 mm, e.g., 1-7 mm). The guidewire is pulled out of the subject's chest through the first trocar, using the grasping element. Subsequently, a second larger-diameter trocar (e.g., a trocar having a diameter of more than 7 mm and/or less than 20 mm, e.g., 7-20 mm) is inserted through the subject's ribs, over the smaller-diameter trocar. Such an application is described hereinbelow, with reference to
In Step 7 of the procedure, cannula 60 is advanced over guidewire 10, through trocar 40 to the outside of apex 6. In Step 8 of the procedure, the cannula is stabilized with respect to the outer surface of the wall of the heart at the apex by a suction cup 77 being placed against the outer surface of the wall of the heart at the apex and applying vacuum pressure via a suction lumen of the cannula, such as to create a vacuum between the suction cup and the outer surface of the wall of the heart at the apex. Steps 7 and 8 are shown in
For some applications, subsequent to the suction cup being placed against the outer surface of the wall of the heart at the apex, as described with respect to Step 8, Step 8a of the procedure, namely the opening of a pericardial window, is performed. For example, one or more balloons may be placed between the myocardium and the pericardium, the balloons being coupled to a sharp element and/or an electrode configured for cutting an incision in the pericardium in order to allow passage of fluid therethrough (e.g., a pericardial window), thus preventing accumulation of blood or fluid between myocardium and the pericardium which may lead to pericardial tamponade. For such an application, a scoring balloon may be used, e.g., placed inside or outside cannula 60. The scoring balloon is typically passed through cannula 60 in order to arrive at a location where it is used to create the incision in the pericardium. Alternatively, a balloon coupled to a sharp element and/or an electrode may be placed between the myocardium and the pericardium for creating an incision in the pericardium.
For some applications, instead of or in addition to the electrode or cutting device disposed on a balloon as described hereinabove, a catheter is passed through a hole in a lateral wall of cannula 60, and an electrode or cutting device is passed through the catheter and is used to create an opening in the pericardium, e.g., to prevent tamponade. Alternatively or additionally, the catheter that is used for opening the pericardial window is passed through an incision in the skin that is separate from the incision through which cannula 60 is passed, and the electrode or cutting device is passed through the catheter and creates the opening in the pericardium. Further alternatively or additionally, the catheter that is used for opening the pericardial window is passed through trocar 40, but is a separate device from cannula 60. For example, the catheter that is used to open the pericardial window may be inserted through trocar 40 before cannula 60 is inserted through the trocar. For some applications, the electrode or cutting device that is used for opening the pericardial window is inserted through an introducer sheath, such as a 12-14 Fr introducer sheath.
Typically, subsequent to the suction cup being placed against the outer surface of the wall of the heart at the apex, as described with respect to Step 8, catheter 12 and structure 30 are retrieved from the subject's left ventricle, as shown in
Typically, guidewire 10 has a variable stiffness. For example, the guidewire with variable stiffness may be manufactured having (a) a distal portion which is soft, which is initially passed to the heart, and (b) a proximal portion which is stiffer, and which is advanced to the heart after the soft distal portion has already been passed out of the heart, through the hole in the apex. In this context, in the specification and in the claims, “proximal” means closer to the orifice through which the guidewire/tool is originally placed into the body, and “distal” means further from this orifice. In Step 9 of the procedure, guidewire 10 is advanced into cannula 60, such that the stiff, proximal portion of the guidewire is advanced through the hole in the apex and out of the subject's chest through trocar 40. Typically, the stiff, proximal portion of the guidewire is only advanced through the hole in the apex subsequent to suction cup 77 having been placed at the apex and suction having been performed so as to stabilize the distal end of the cannula with respect to the apex, by creating a vacuum between the suction cup and the outer surface of the wall of the heart at the apex. Further typically, before the distal end of the cannula has been stabilized with respect to the apex, only the soft distal portion of the guidewire is passed through the apical hole so as to prevent the myocardium from being damaged by the heart pulsating while the guidewire is disposed in the hole through the apex. Subsequent to the stabilization of the distal end of the cannula with respect to the apex, the distal end of the cannula protects the myocardium from being damaged. Therefore, at this stage, the proximal, stiff portion of the guidewire may be advanced through the hole through the apex. The proximal, stiff portion of the guidewire is typically used to facilitate the guidance of tools (e.g., an inner tube of cannula 60 with dilator 90, described hereinbelow, a Transcatheter Aortic-Valve Implantation (TAVI) introducer sheath with a dilator, and/or an introducer sheath of a prosthetic mitral valve with a dilator) through trocar 40, and/or through the hole in the apex of the subject's heart. For some applications, a standard (e.g., off-the shelf) guidewire, such as a super or extra stiff guidewire is used for at least a portion of the procedure described herein. For some applications, the guidewire has a length of more than 360 mm, less than 420 mm, and/or 360-420 mm.
It is further noted that, typically, prior to cannula 60 being stabilized with respect to the apex, generation of tension in the guidewire by pulling on the distal end of the guidewire is avoided. Rather the guidewire is advanced, by the proximal end of the guidewire being fed through the femoral access point, and by the distal end of the guidewire being directed out of the subject's chest by being pulled gently with the grasping element.
Typically, the guidewire having the varied stiffness is formed by using a connection element to connect a first soft guidewire to a stiffer guidewire, and, optionally, an additional connection element is used to connect this stiffer guidewire to an even stiffer guidewire. Typically, but not necessarily, these successive guidewires are connected to each other by means of friction, such as by a crimping tube placed around the two guidewires that are to be coupled together (typically at the time of manufacture). In addition, these connections can typically be easily disconnected, in order to again form two or more distinct guidewires. For some applications, radiopaque markers are disposed on one or both portions of a guidewire having varied stiffness such that the portions of the guidewire are identifiable in fluoroscopic images of the guidewire. For example, radiopaque markers having respective shapes may be disposed on the portions of the guidewire having different levels of stiffness. Or, radiopaque markers having respective spacings between adjacent markers may be disposed on the portions of the guidewire having different levels of stiffness.
For some applications, guidewire 10 defines an outer soft layer, and an inner stiff core that is moveable with respect to the outer soft layer. For example, the guidewire may be generally similar to moveable core guidewires known in the art, such as those manufactured by Cook® Medical. Initially the guidewire is advanced to the apex, while the stiff inner core is retracted with respect to the distal end of the soft outer layer of the guidewire. Thus, at this stage, the distal end of the guidewire is soft and is configured not to cause an injury to the inner wall of the heart at the apex. Catheter 12 is guided to the apex by being advanced over the guidewire. When the distal end of catheter 12 is stabilized at the apex, the soft outer layer of the guidewire is refracted into the catheter, such that the inner core of the guidewire stiffens the distal end of the guidewire. Typically, at this stage, the positions of the stiff inner core and the soft outer layer of the guidewire are locked with respect to one another. The distal end of the guidewire is then advanced through the wall of the heart at the apex, such as to penetrate the wall of the heart at the apex. For some applications, the distal end of the guidewire penetrates the wall of the heart at the apex by the distal end of the guidewire itself piercing a hole through the apex. Alternatively, an inner catheter 33 (shown in
For some applications, guidewire 10 is covered with a soft outer layer, such as a soft, plastic outer layer.
Steps 10-12 are shown in
Inner tube 62 of cannula 60 is typically advanced through the myocardial tissue by pushing the inner tube distally with respect to an outer tube 64 of the cannula, by pushing a portion 63 of the handle of the cannula distally. A balloon 72 is disposed at the distal end of the inner tube of the cannula. In Step 11 of the procedure, when the distal end of inner tube 62 is disposed inside the subject's left ventricle 4, balloon 72 is inflated by injecting fluid (e.g., a liquid, such as saline) into the balloon via an inflation port 67 of the cannula. Balloon 72 is typically shaped to conform with the shape of the inner wall of the ventricle at the apex, as described in further detail hereinbelow. In Step 12 of the procedure, subsequent to the balloon having been inflated, inner tube 62 is retracted proximally with respect to outer tube 64 of the cannula, such that the balloon is pulled back against the inner wall of the ventricle at the apex. The position of the inner tube 62 with respect to outer tube 64 of the cannula is typically fixed, for example, by locking the positions of the tubes with respect to one another using a locking mechanism 66.
As described hereinabove, suction cup 77 is typically placed on the outer surface of the wall of the heart at the apex, and a vacuum is created between the suction cup and the outer surface of the wall of the heart at the apex. Typically suction cup 77 is disposed at the distal end of outer tube 64 of cannula 60. Thus, when inner tube 62 of the cannula is retracted proximally with respect to the outer tube of the cannula, as described above, the tissue of the heart surrounding the hole in the apex is secured (e.g., by being gently squeezed) between balloon 72 and the suction cup. Typically, the vacuum between the suction cup and the outer surface of the wall of the heart at the apex is created by applying vacuum pressure through the space between inner tube 62 and outer tube 64 of cannula 60. Thus, a vacuum is formed between the suction cup and the tissue of the heart surrounding the hole, thereby sealing the suction cup to the tissue that surrounds the hole in the apex. Typically, balloon 72 provides sealing of the cannula 60 with respect to the inner surface of the wall of the heart at the apex.
Subsequent to sealing the tissue of the heart that surrounds the hole with respect to the suction cup and securing the tissue surrounding the hole between the balloon and the suction cup, dilator 90 is withdrawn from the inner tube of cannula 60. At this stage, the inner tube 62 of cannula 60 provides a working channel from outside the subject's chest to inside the subject's heart, via the hole in the apex of the heart. The distal end of the cannula is sealed with respect to the tissue that surrounds the hole at the apex, as described hereinabove. For some applications, a further tube that is disposed within inner tube 62 of the cannula provides the working channel of the cannula.
In Step 13, a cardiac interventional procedure is performed with respect to the subject's heart, using the working channel that has been created through the subject's chest into the subject's heart via the hole at the apex. Typically a working catheter that is used to perform the procedure is inserted into the subject's heart via the working channel. For example, a valve of the subject's heart may be repaired or replaced (e.g., the subject's aortic valve may be replaced using a TAVI procedure, and/or the subject's mitral valve may be replaced), or a different cardiac structure may be repaired or replaced. Alternatively or additionally, the working channel can provide access to the subject's heart to facilitate any other type of cardiac surgery that can be performed with a minimally-invasive approach, such as ablation of a heart wall, implantation of a cardiac assist device, repairing a structural defect of the heart, repair of a failed bioprosthesis, treatment of atrial fibrillation, and/or transvascular approach to repairing or implanting a device in the ascending aorta, the aortic arch, and or the carotid arteries. For some applications, two or more guidewires pass through the working channel. For example, guidewire 10 may be used to facilitate an aortic intervention, and an additional guidewire may be introduced from the apex into the left atrium, via the working channel, in order to facilitate a mitral intervention.
In Step 14, subsequent to performing the cardiac interventional procedure, the tools that were used to perform the procedure are withdrawn from the working channel of cannula 60. Typically, at this stage (i.e., before the insertion of a hole closure device into the hole in the apex of the subject's heart, in Steps 15-17), guidewire 10 is retracted into the subject's left ventricle. Subsequently, in Step 18, the guidewire is completely removed from the subject's body, as described hereinbelow. Alternatively, the guidewire is not retracted at this stage, and the guidewire remains such that the distal end of the guidewire is disposed outside the subject's chest during the insertion of the hole closure device (i.e., until Step 18 of the procedure). Further alternatively, the removal of the guidewire from the subject's body is performed in its entirety at this stage, and not in Step 18, as described hereinbelow.
In Step 15, a hole closure device 80 is advanced through the working channel of cannula 60. The hole closure device typically defines an intracardiac portion 81, a plug portion 82, and an extracardiac portion 83, as described in further detail hereinbelow with reference to
In Step 16, balloon 72 is deflated and inner tube 62 of cannula 60 is retracted. The retraction of the inner tube of the catheter pulls the intracardiac portion of hole closure device 80 against inner wall of the apex of the subject's heart. Subsequently, the inner tube of the cannula is further retracted, such as to release plug portion 82 of the hole closure device from the inner tube of the cannula. For example, a pushing element 86 (shown in
In Step 17, suction of suction cup 77 is terminated and outer tube 64 and inner tube 62 of cannula 60 are retracted from the subject's heart and out of the subject's chest through trocar 40. The retraction of the cannula is such as to cause extracardiac portion of hole closure device 80 to be released from inner tube 62. For example, a pushing element disposed within inner tube 62 may be configured to hold the hole closure device stationary with respect to the subject's heart while the cannula is retracted. The hole closure device is typically configured such that, upon protruding from the distal end of the cannula, the extracardiac portion assumes a concave shape that conforms with the shape of the outer surface of the wall of the apex of the heart. In general, the hole closure device is configured to automatically seal the hole in the apex, subsequent to the removal of cannula 60 from the hole, as described in further detail hereinbelow.
In Step 18, guidewire 10 and trocar 40 are removed from the subject's body. The guidewire is removed by pulling the guidewire from the proximal end of the guidewire (e.g., at the subject's femoral artery), or from the distal end of the guidewire (at the subject's chest).
Reference is now made to
Typically, structure 30 comprises an inflatable and/or an expandable element, such as a balloon (shown in
For some applications, distal tip 122 of catheter 12, and/or structure 30, is steerable. For some applications, distal tip 122 of catheter 12 and structure 30 are steerable together with one another. Alternatively or additionally, the distal tip defines a channel therethrough, the longitudinal axis of at least a distal portion of the channel being disposed at an angle from the local longitudinal axis of the catheter. For some applications, the distal tip is configured to direct guidewire 10 out of the distal tip of the catheter at an angle from the local longitudinal axis of the catheter, by the guidewire being directed out of the channel defined by the distal tip.
For some applications, first catheter 12 is advanced over a first, typically flexible guidewire, e.g., a 0.089 cm (0.035 inch) soft wire known in the art, into a chamber of the heart, e.g., left ventricle 4. Catheter 12, e.g., a 3-9 Fr catheter, is advanced over the guidewire to a desired location within the chamber of the heart, e.g., against apex 6 of the left ventricle 4. For some applications, structure 30 may provide guidance for catheter 12 to position the catheter at the apex, and/or may be used in order to reduce possible damage to the apex when catheter 12 is positioned against the apex. For some applications, an inner catheter 33 (shown in
For some applications, after establishing the passage through the apex to the skin, the first flexible guidewire is transfemorally removed, and a second guidewire (e.g., guidewire 15, shown in
For some applications, distal tip 122 of catheter 12 is flexible. For example, the tip may include a compliant material which is configured to reduce the possibility that the distal portion of the catheter may cause damage to the interior of the heart chamber. For some applications, such a configuration of distal tip 122 does not require the use of an additional protective structure 30. Thus, for some applications, catheter 12 is inserted into the subject's heart (e.g., toward the inner surface of the heart at the apex) in the absence of structure 30, the catheter defining a flexible distal tip thereof. Alternatively, structure 30 is used to protect the interior of the heart chamber (and/or to provide one or more of the additional functionalities of structure 30, such as to facilitate placement and stabilization of the distal tip of the catheter at the apex) in addition to the tip of the catheter being flexible. It is noted that in general, any of the components placed in the subject's body may include one or more radiopaque portions (e.g., radiopaque markers), e.g., a tip portion of catheter 12 may be radiopaque, and/or at least a portion of structure 30 may be radiopaque.
For some applications, distal tip 122 of catheter 12 is composed of silicone or any other suitable flexible and compliant material, e.g., latex and/or polyurethane. Typically distal tip 122 is 0.3-10 mm in length, e.g., 0.5-6 mm. For some applications, a portion of catheter 12 between the distal tip and the proximal portion of catheter includes a stiff elastomer or other suitable plastic material, which is typically intermediate in a mechanical property (e.g., stiffness) and/or structural behavior between that of the distal tip and that of the proximal portion of the catheter.
Reference is now made to
For some applications, protective structure 30 includes any suitable three-dimensional structure, e.g., a balloon or a braided mesh, comprising nitinol or stainless steel or cobalt chromium (or another material) which can be deployed and/or expanded in the heart chamber. Typically, the protective structure provides support for the stabilization of the catheter. Additionally or alternatively, protective structure 30 advanced transvascularly into the left ventricle serves as a radiopaque marker for locating the left ventricle and any element used during the procedures for transthoracic cardiac surgery described herein. For some applications, the protective structure is shaped to fit snugly in the apex, in order to provide stabilization of catheter 12 as described, and/or to facilitate proper subsequent creation of a hole in the apex.
Typically, protective structure 30 reduces the possibility that the distal portion of the catheter may cause damage to the interior of the heart chamber. Additionally or alternatively, protective structure 30 provides support for the stabilization of catheter 12. Further additionally or alternatively, protective structure 30 provides guidance for the catheter, by facilitating proper positioning of the distal portion of catheter 12 against apex 6. In particular, use of protective structure 30 facilitates guidance of a piercing element (e.g., inner catheter 33, or second guidewire 15, described hereinabove) to a desired puncture site in the apex.
Reference is made to
For some applications, catheter 12 is a 4-9 Fr multi-lumen or single-lumen catheter. As described hereinabove, catheter 12 is advanced over guidewire 10 to a desired location within the left ventricle, e.g., against apex 6 of the left ventricle 4. In accordance with respective applications, catheter 12 may or may not have variable stiffness along the length thereof. For some applications, catheter 12 has a curved distal portion 13 comprising a distal tip shaped to define a flexible “J” (or alternatively the tip is pigtail-shaped). The distal portion of catheter 12 typically fits into the naturally curved anatomical shaped of the apex of the left ventricle as shown in
Subsequently to positioning of catheter 12 against the apex of the left ventricle, first guidewire 10 is removed and a second, typically less flexible, guidewire 15 is advanced through catheter 12 to the apex of the left ventricle. The second guidewire typically comprises a sharp distal portion (not shown) configured to puncture the apex of the heart from inside the left ventricle. The second guidewire is advanced to aperture 14 in catheter 12 and is advanced through the aperture to puncture and penetrate the wall of the left ventricle at the apex, as shown in
Typically, the distal tip of catheter 12, which is shaped to define a “J”, has a radius of curvature that is between 2 and 40 mm, e.g., between 5 and 20 mm. The distance between aperture 14 and the distal tip is typically between 1 and 40 mm, e.g., between 10 and 25 mm (as measured along the length of catheter 12). Such a configuration of catheter 12 typically conforms to apical anatomy and enables performing procedures described herein in a repeatable and reproducible manner.
Reference is now made to
Reference is now made to
As shown in
For some applications, snare 55 is configured to ensnare the guidewire by tightening around the distal end of the guidewire. Guidewire 10 may be engaged by advancing snare 55 in a longitudinal direction, as shown on the left of
For some applications, grasping element 50 includes a snare that comprises a distal wire loop 55a disposed at the distal end of a rigid tube 55b, as shown in
For some applications, the rigidity of wire loop 55a facilitates the use of tube 55b and wire loop 55a as a tissue-separation tool that may be used to separate tissue of the apex of the heart from tissue of the chest wall. Thus, wire loop may be used both for grasping guidewire 10 and for separating soft tissue of the apex of the heart from tissue of the chest wall. For some applications, tube 55b and wire loop 55a are configured to act as a tissue separation tool, when the wire loop is partially retracted into tube 55b, as shown in
As shown in
As shown in
For some applications, grasping element 50 includes an apical element 58, which is advanced through catheter 56 and positioned against the external side of the apex. Element 58 may comprise a braided mesh or any other suitable configuration of nitinol and/or stainless steel and/or plastic or other material, suitable for grasping or otherwise holding a tool such as a guidewire. Element 58 is typically positioned against the external side of the apex and may apply slight pressure to the apex for stabilization of catheter 12, located in the left ventricle.
For some applications, guidewire 10 is then removed from catheter 12, and a second guidewire (e.g., guidewire 15, shown in
Guidewire 10 or second guidewire 15 is passed out of the heart and into catheter 56, where it is received by element 58, which is positioned within catheter 56 and against the external side of the apex. Element 58 typically facilitates guiding of the guidewire into the catheter 56. For some applications, element 58 includes a magnet which is configured to take hold of the guidewire and direct it into catheter 56. For some applications, hinged clip 52, described with reference to
Guidewire 10 or second guidewire 15 continues to be advanced through catheter 56 to the skin of the subject, such that the guidewire or a portion thereof extends from the heart to the skin, establishing a path. For some applications, the skin includes skin of a chest of the subject, and the guidewire is passed through the chest wall to the skin of the chest. For some applications, the guidewire is advanced through the passage and a short distance towards skin of the subject. At that point, the guidewire may be guided, e.g., by use of an additional tool, out of the passage and towards skin of the subject. Alternatively, the guidewire is advanced through the passage in the heart wall and through a portion of the distance towards the skin and subsequently directed toward the skin by use of an additional tool. Guidewire 10 or 15 then establishes a path between the heart, specifically the left ventricle, and skin of the subject.
In some applications, first guidewire or second guidewire 15 comprises proximal and distal ends thereof, and the distal end typically has a straight configuration while being passed through catheter 12. For some applications, the distal tip of the guidewire comprises needle functionality (for example, the distal tip may be needle-like) and is configured to puncture a wall of the heart chamber from within the chamber of the heart and create a passage in the wall of the heart. The guidewire is then passed through the passage, out of the heart. For some applications (not shown), the distal end of the guidewire assumes a curved configuration upon exiting the heart chamber, such that the distal end is curved towards skin of the subject, and generally away from the subject's diaphragm. For some applications, the curved guidewire is rotated to a desired position, e.g., towards skin of the subject. The guidewire may be rotated under fluoroscopy or any other suitable imaging means, or alternatively without any imaging. The guidewire is then advanced towards and through the skin of the subject, such that the guidewire extends from the heart to the skin, establishing a path. Typically, a curved distal end of the guidewire allows for more precise directing and advancing of the guidewire towards skin of the subject, and generally reduces the risk of the guidewire penetrating abdominal organs in its vicinity.
For some applications, catheter 12 itself is configured to mechanically maintain curved first guidewire 10 or second guidewire 15 in a straight configuration while inside the catheter. For some applications, the guidewire comprises a shape memory material, e.g., nitinol and/or stainless steel, or elgiloy, or any cobalt-chromium wire, such as MP35N, or any other suitable material known in the art. For some such applications, the guidewire may comprise nitinol and may be cooled inside the catheter and thereby be deformed into a straightened (substantially not curved) configuration. Upon exiting the catheter, the nitinol guidewire reaches body temperature, causing it to regain its original curved shape.
For some applications, a magnet is applied to the skin surface from outside the body of the subject and is used to facilitate rotation and steering of first guidewire 10 or second guidewire 15 towards the skin surface of the subject. In this case, the guidewire comprises a magnetic material.
For some applications, first guidewire 10 or second guidewire 15 may preliminarily be passed out of the distal end of the catheter inside the heart chamber. The guidewire, particularly the curved distal end, is then examined, e.g., by fluoroscopy, to determine if it is oriented in a desired direction. The guidewire may then be rotated inside the heart chamber until it reaches a desired orientation. Alternatively, a marking on the guidewire at the femoral artery (or other artery) entrance point is used to indicate the rotational disposition of the curved distal end of the guidewire, within the heart chamber. For example, the marking may be placed on the guidewire, such that when the guidewire is rotated to place the marking in an anterior position with respect to the subject's body, the curved distal end of the guidewire is correspondingly aimed anteriorly, i.e., towards the subject's chest wall.
In summary, in applications described hereinabove, guidewire 10 or second guidewire 15 with or without a curved distal tip is advanced from the heart to the skin of the subject in order to establish a path between the heart (for example, the left ventricle or another chamber), and skin of the subject.
For some applications, subsequently to extending guidewire 10 or guidewire 15 between the heart and the skin of the subject, a dilator is passed from the skin over the guidewire, in order to create an enlarged path to the heart. The enlarged path to the heart facilitates passage of tools used in cardiac procedures, such as valve repair and/or replacement tools (for example, for implantation of a prosthetic aortic valve and/or a prosthetic mitral valve).
For some applications, a plurality of successively larger dilators are passed from the skin over guidewire 10 or guidewire 15, and are used to dilate the path to a suitable size to facilitate the passage of tools through the now-enlarged path, into the heart chamber. For example, a series of concentric dilators may be passed over the guidewire. (As appropriate, smaller dilators may be removed after larger ones have been passed over the guidewire, or they may remain in place.) Alternatively or additionally, an expandable dilator may be used to enlarge the path, e.g., by balloon inflation of the dilator. Optionally, the dilator may be plastically deformable during the inflation, so as to maintain the enlarged path and thereby facilitate subsequent passage of a tool therethrough. For some applications, other techniques (e.g., as are known in percutaneous nephrostomy) are used to dilate the path.
Typically, the enlarged path between the subject's skin and the subject's heart (via the hole in the apex of the heart) is provided by cannula 60 described hereinabove with reference to
Reference is now made to
Reference is now made to
Typically, a dilator 41a is disposed inside trocar 41, and trocar 41 and dilator 41a are inserted through the subject's ribs toward the apex of the subject's heart. When trocar 41 and dilator 41a are disposed at the apex, dilator 41a is retracted through trocar 41, and removed from the subject's body. For some applications, at this stage, grasping element 50 described hereinabove is inserted into the subject's chest cavity through first smaller-diameter trocar 41. Guidewire 10 is pulled out of the subject's chest through the first trocar, using the grasping element.
Subsequently, a second larger-diameter trocar 43 is inserted through the subject's ribs toward the apex of the subject's heart, using a dilator 45 to facilitate the advancement of the larger-diameter trocar. For some applications, trocar 43 and dilator 45 are advanced toward the apex over trocar 41. Subsequent to the advancement of trocar 43 and dilator 45 over trocar 41, trocar 41 and dilator 45 are retracted from the proximal end of trocar 43, leaving the distal end of trocar 43 in the vicinity of the apex, and guidewire 10 passing out of the subject's chest through trocar 43. For such applications, dilator 45 defines a lumen therethrough that is sized to accommodate trocar 41. For example, dilator 45 may define a lumen therethrough having a diameter of more than 5 mm, less than 15 mm, and/or 5-15 mm (e.g., approximately 7 mm). In alternative applications, subsequent to the guidewire being pulled out of the subject's chest through trocar 41, trocar 41 is removed from the subject's body. Trocar 43 and dilator 45 are then advanced through the subject's ribs toward the apex of the subject's heart over guidewire 10. Typically, for such applications, before trocar 43 and dilator 45 are advanced over the guidewire, the positions of trocar and the dilator with respect to one another are locked, such as to avoid kinking of the guidewire during the advancement of the trocar and the dilator over the guidewire. Further typically, for such applications, dilator 45 defines a lumen through at least a portion thereof that is sized to accommodate, and be guided by guidewire 10. For example, dilator 45 may define a lumen through at least a portion thereof having a diameter of more than 0.2 mm, less than 3 mm, and/or 0.2-3 mm (e.g., approximately 2 mm). For some applications, a distal portion of dilator 45 defines a lumen having the described dimensions, in order to facilitate guiding the dilator over the guidewire, and a proximal portion of the dilator is hollow, an inner diameter of the hollow proximal portion being greater than that of the lumen defined by the distal portion of the dilator.
As described with reference to
For some applications, one or more of the trocars described herein (e.g., trocar 40 (
Reference is now made to
As described hereinabove, cannula 60 typically includes inner tube 62 and outer tube 64, the inner tube being slidable with respect to the outer tube. Outer tube 64 forms a passage from the subject's skin to the subject's heart, and inner tube 62 passes into a chamber of the heart through the outer tube, thereby providing a passage from the subject's skin to the subject's heart. Balloon 72 is typically disposed on the distal end of the inner tube, the balloon being configured to be disposed within the heart chamber and to be pulled back against the inner surface of the wall of the heart. Suction cup 77 is typically disposed on the distal end of outer tube 64. Typically, the suction cup defines a flared distal end of outer tube 64. The cannula typically includes one or more (e.g., two or three) hemostatic valves at the proximal end of the cannula. The cannula typically defines vacuum port 61, inflation port 67, and flushing port 69, having functionalities as described hereinabove.
Inner tube 62 and outer tube 64 are typically movable with respect to one another, as described hereinabove. It is noted that, typically, cannula 60 is moveable with respect to trocar 40, or trocar 43. Thus, inner tube 62 of cannula 60, and outer tube 64 of cannula 60, are movable with respect to one another and with respect to trocar 40, or trocar 43. For some applications, outer tube 64 is advanced toward the heart while inner tube 62 is retracted such that the inner tube is disposed inside the outer tube. Typically during the insertion of the distal end of the outer tube of the cannula through the trocar, the suction cup is folded inside sheath 78 (shown in
The suction cup is typically configured to assume a curved shape that is configured to conform with the shape of the outer surface of the heart at the apex, when the suction cup is in a non-constrained state thereof. For some applications, the suction cup includes a shape memory material that is configured to cause the suction cup to assume the curved shape, when the suction cup is in a non-constrained state thereof. For example, the suction cup may include ribs that are made from a shape memory alloy, such as nitinol. For some applications, the ribs are configured to prevent the suction cup from folding backward upon being pushed against the outer surface of the subject's heart. For some applications, the suction cup is made of silicone and the ribs comprise thickened rib-shaped portions of the silicone. For some applications, the suction cup is configured to assume a curved shape in which a proximal portion 75 of the suction cup is concave in the distal direction (i.e., the direction that is toward the heart and away from the skin of the chest), and a distal portion 79 of the suction cup is convex in the distal direction, as shown in
Subsequent to the sealing of suction cup 77 against the outer surface of the wall of the heart at the apex, the distal end of inner tube 62 is typically slid distally with respect to outer tube 64, for example, by pushing portion 63 of the cannula handle distally. The distal end of the inner tube is advanced to inside the subject's heart via the hole that has been pierced through the apex (i.e., the passage through the apex). Typically, while the distal end of the inner tube is advanced through the passage in the apex, dilator 90 (not shown in
As described hereinabove, subsequent to sealing the tissue of the heart that surrounds the hole with respect to the suction cup and the securing of the wall of the heart between the balloon and the suction cup, the dilator is withdrawn from the inner tube of cannula 60. At this stage, inner tube 62 of cannula 60 provides a working channel from outside the subject's chest to inside the subject's heart, via the hole in the apex of the heart. The distal end of the cannula is sealed with respect to the tissue that surrounds the hole at the apex, as described hereinabove. For some applications, a further tube that is disposed within inner tube 62 of the cannula provides the working channel of the cannula. Cannula 60 typically provides a working channel from outside the subject's chest, through trocar 40, and into the subject's heart via the hole in the apex.
Typically, a cardiac interventional procedure is performed with respect to the subject's heart, using the working channel that has been created through the subject's chest into the subject's heart via the hole at the apex. Typically, a working catheter that is used to perform the procedure is inserted into the subject's heart via the working channel. For example, a valve of the subject's heart may be repaired or replaced, or a different cardiac structure may be repaired or replaced. Alternatively or additionally, the working channel can provide access to the subject's heart to facilitate any other type of cardiac surgery that can be performed with a minimally-invasive approach, such as ablation of a heart wall, implantation of a cardiac assist device, repairing a structural defect of the heart, repair of a failed bioprosthesis, treatment of atrial fibrillation, and/or transvascular approach to repairing or implanting a device in the ascending aorta, the aortic arch, and or the carotid arteries. Accordingly, any suitable delivery system (e.g., any other catheter used in the art) may be used to penetrate the passage in the heart for delivery of the tool. For example, an inner tube (not shown), e.g., a Transcatheter Aortic-Valve Implantation (TAVI) introducer sheath, or an introducer sheath of a prosthetic mitral valve, may be advanced through cannula 60 for delivery of an element required for valve implantation.
Reference is now made to
For some applications, as described with reference to
Inner tube 62 and outer tube 64 of cannula 60 are typically movable with respect to one another, as described with reference to
For some applications, balloons 72 and 74 assume the shapes shown in
Reference is now made to
As describe hereinabove, typically in order to insert cannula 60 through trocar 40 or trocar 43, suction cup 77 is first folded. For some applications, in order to fold the suction cup, inner tube 62 is first refracted with respect to outer tube such that the inner tube does not impede the folding of the suction cup. A suction-cup folder 71 is disposed on the cannula, as shown in
Reference is now made to
The space-occupying elements may comprise any suitable three-dimensional structure e.g., a stent or a multiple wire configuration or an inflatable element. As shown in
Inflation of one or more of the balloons against the wall of the ventricle typically additionally provides sealing of the puncture site by the balloon, and aids in reducing leakage of blood from the puncture site. Alternatively or additionally, the balloons coupled to the cannula inhibit the cannula from inadvertently slipping out the heart. Further alternatively or additionally, the balloons coupled to the cannula provide stabilization while tools are introduced, thereby helping to reduce bleeding.
The balloons may comprise materials configured to be stiff or compliant, such as nylon, silicone, latex or polyurethane. For some applications, the balloons comprise a mixture of materials for providing a balloon of varying stiffness, such that one side of the balloon is compliant (e.g., the heart-facing side), while the other side is stiffer.
The balloons may in principle have any suitable shape (e.g., spherical, ellipsoidal, toroidal, hourglass, or cylindrical). For some applications, the maximum length of one or more of the inflated balloons, measured along the longitudinal axis of the cannula, is smaller than the maximum length of the inflated balloon measured perpendicular to the longitudinal axis of the cannula. For example, the inflated balloon may be disk-shaped, and one side of the disk may be pressed against the interior wall of the heart chamber in which the balloon is disposed. In this manner, for a relatively low inflation volume of the balloon, a relatively large area of the external surface of the balloon is provided for applying force to the interior wall of the heart chamber. For some applications, the maximum length measured perpendicular to the longitudinal axis of the cannula is at least 30 percent (e.g., at least 100%) greater than the maximum length of the inflated balloon measured along the longitudinal axis of the cannula.
For some applications, the cannula may have multiple balloons 72, or any other space-occupying elements that function as inflatable and/or sealing elements, that may be positioned at any anatomical layer along the path created between the heart and the skin of the chest wall, or outside of the chest wall (e.g., on the skin). For example, the balloons may be positioned between the myocardium and the pericardium 3, and/or between the pericardium and the chest wall, or in any other location along the aforementioned path.
For some applications, one or more of the balloons shown in
For some applications, instead of or in addition to the electrode or cutting device disposed on a balloon as described hereinabove, a catheter is passed through a hole in a lateral wall of cannula 60, and an electrode or cutting device is passed through the catheter and is used to create an opening in the pericardium, e.g., to prevent tamponade. Alternatively or additionally, the catheter is passed through an incision in the skin that is separate from the incision through which cannula 60 is passed, and the electrode or cutting device is passed through the catheter and creates the opening in the pericardium.
Reference is now made to
For some applications, cannula 60 (or a different cannula or catheter) is advanced into the subject's heart (as described hereinabove), support member 98 being disposed on a distal portion of the catheter, and the balloons being in deflated states (not shown). When first balloon 94 is disposed within the heart chamber and second balloon 96 is placed between the pericardium and the chest wall, the balloons are inflated with an inflation fluid (e.g., saline), as shown in
For some application, when balloons 94 and 96 have been suitably positioned and inflated so as to seal the hole in the wall of the heart, a thermosetting material, such as epoxy, is injected into one or both of the balloons, via injection lumens (not shown). The inflation fluid (e.g., the saline) that was used to inflate the balloons is removed from one or both of the balloons via drainage lumens (not shown). The thermosetting material hardens (i.e., changes from a fluid state to a solid state thereof) inside the balloons, thereby maintaining the shape of the balloons.
Reference is now made to
For some applications, closure device 80 is passed into the heart over the guidewire 10 or 15, and/or through a cannula (e.g., cannula 60) or a catheter, through a path that was created from the heart to the chest wall, for example, using the techniques described herein. As shown in
As shown in
For some applications, plug portion 82 comprises a transmural plug portion comprising a biodegradable and/or bioabsorbable and/or degradable implantable material and/or a cloth and/or a sponge, e.g., surgical cloth. Typically, the transmural plug portion includes an external layer, which is rolled, stretchable polyester velour, and an inner towel-like polyester velour layer. The transmural plug portion is configured for placement within the passage in the wall of the heart, and is configured to conform, e.g., expand, to the size and shape of the passage, such that the plug provides sufficient sealing of the passage by occupying the entire space of the passage. For some applications, the biodegradable plug comprises a material such as PGA and/or collagen. For some applications, the plug is not biodegradable. For some applications, the plug comprises a nitinol and/or a stainless steel and/or a cobalt chromium structure. The plug may comprise any other suitable material, e.g., plastic and/or nylon.
Typically, plug portion 82 comprises an expansible material. The plug portion is configured to be placed at the hole via an insertion device, such as cannula 60, while the plug portion is constrained by the insertion device. Upon being pushed out of the insertion device, the plug portion is configured to expand radially since the plug portion is no longer constrained by the insertion device. Thus, the plug portion expands to fill the hole in the apex. For example, if the radius of the hole is 5 mm (e.g., due to cannula 60 having an outer radius of 5 mm), then during insertion of the plug portion, the plug portion may be maintained in a radially-compressed state due to being constrained by the cannula, the plug portion defining an outer radius of 4 mm in the radially-compressed state. Upon being pushed out of the cannula, the plug portion radially expands to a radius of at least 5 mm, thereby sealing the hole. Typically, the plug portion is configured to expand radially by more than 0.5 percent, e.g., more than 5 percent between the constrained state of the plug portion (inside the insertion device) and the unconstrained state of the plug portion, even in the absence of any radial expansion of the plug portion that is due to absorbance of fluid by the plug portion. For example, the plug portion may be configured to radially expand by 0.5-100 percent, e.g., 0.5-5 percent, and/or 5-100 percent between the constrained state of the plug portion (inside the insertion device) and the unconstrained state of the plug portion.
Alternatively or additionally, plug portion 82 comprises an absorbent material, the plug portion thereby being configured to expand radially due to absorbing body fluids, i.e., it swells in the presence of fluid. Typically, the plug portion is configured to expand radially by more than 0.5 percent, e.g., more than 5 percent due to absorbing fluids. For example, the plug portion may be configured to radially expand by 0.5-100 percent, e.g., 0.5-5 percent, and/or 5-100 percent due to absorbing fluids. For some applications, the radial expansion of the plug portion due to the absorbance of fluid by the plug portion, is in addition to the radial expansion of the plug due to expansible properties of the plug portion itself, as described hereinabove.
Thus, the plug portion facilitates sealing of the hole at least partially by radially expanding such that the outer surface of the plug portion comes into contact with the inner surface of the wall of the heart that defines the hole at the apex. For some applications, the radial expansion of the plug is accompanied by longitudinal shortening of the plug, e.g., 0.5-50 percent shortening (for example, 0.5-5 percent, or 5-50 percent). Alternatively, the plug does not shorten longitudinally, and/or the plug becomes elongated due to forces exerted on the hole closure device by the subject's heart tissue, upon being released from its constrained configuration inside the insertion device. These values are typically observed in the absence of any forces applied to the plug (e.g., if the plug were not implanted in the heart). Some changes in the values may be expected based on the properties of any individual subject's heart, and the nature of the passage into which the plug is placed.
For some applications, during insertion of the hole closure device via the insertion device, the plug portion is configured to be constrained into a longitudinally elongated configuration relative to a rest configuration of the plug portion (i.e., the configuration of the plug portion in the absence of any force being applied to the plug portion). Upon being placed inside the hole inside the subject's apex, the plug portion is configured to longitudinally shorten relative to the length of the plug portion inside the insertion device. However, when disposed inside the hole inside the subject's apex, the plug portion is configured to remain longitudinally elongated relative to the rest configuration of the plug portion, due to forces exerted on the hole closure device by the subject's heart tissue. Typically, the plug portion is configured to elongate as necessary in order to accommodate the thickness of the wall of apex of the subject's heart between the intracardiac and extracardiac portions of the hole closure device.
Typically, intracardiac portion 81 of closure device 80 is coupled to plug portion 82, and is configured for placement within the heart chamber. Typically, the intracardiac portion becomes coupled to the cardiac wall in a vicinity of the passage and facilitates anchoring of the plug portion within the passage. For some applications, intracardiac portion 81 of closure device 80 generally conforms to the shape of the inner cardiac wall. For example, in accordance with some applications of the present invention, the passage is created in the apex of the left ventricle. For such applications, the intracardiac portion typically defines a conical shape (e.g., an upwardly-concave (i.e., concave in the distal direction) disc shape, as shown) fitting into the apex inside the left ventricle. Alternatively, the intracardiac portion may be shaped to define any other shape that facilitates anchoring of the plug portion within the passage, e.g., a torus, a disc shape, or a mesh, coupled to the plug. The intracardiac portion of the closure device typically comprises nitinol or stainless steel (e.g., a nitinol or stainless steel mesh, and/or nitinol or stainless steel struts), which materials may facilitate tissue growth (e.g., growth of endothelial tissue) on the surface of the intracardiac portion and reduce any chronic adverse immune reaction. For some applications, the intracardiac portion includes a fabric, such as a polyethylene terephthalate cloth, and/or any other material that may be used as an impermeable patch. For some applications, the proximal side of the intracardiac portion (i.e., the side that contacts the heart tissue) is covered with double-sided polyester velour, and the distal side of the intracardiac portion (i.e., the side that faces the left ventricle) is covered with a thin layer of woven polyester.
Typically, closure device 80 further comprises extracardiac portion 83 that is coupled to plug portion 82 and configured for placement outside the heart chamber. Typically, the extracardiac portion becomes coupled to an external side of the cardiac wall in a vicinity of the passage and facilitates anchoring of the plug portion within the passage. For some applications, the extracardiac portion of the closure device conforms to the shape of the outer cardiac wall. For example, in accordance with some applications of the present invention, the passage is created in the apex of the left ventricle, and the extracardiac portion defines an upwardly-concave cap-shape or disc-shape fitting onto the apex from outside the left ventricle. For some applications, the distal side of the extracardiac portion (i.e., the side that contacts the heart tissue) is covered with double-sided polyester velour, and the proximal side of the extracardiac portion (i.e., the side that faces the subject's chest) is covered with a thin layer of woven polyester.
As described hereinabove, for some applications, intracardiac portion 81 and extracardiac portion 83 define upwardly-concave disc shapes. Typically, the intracardiac portion defines an upwardly-concave disc shape having a radius of curvature that is greater that the radius of curvature of the intracardiac side of the apex, so as to facilitate sealing of the intracardiac portion of the closure device with respect to the intracardiac side of the apex. Further typically, the extracardiac portion defines an upwardly-concave disc shape having a radius of curvature that is less that the radius of curvature of the extracardiac side of the apex, so as to facilitate sealing of the extracardiac portion of the closure device with respect to the extracardiac side of the apex. Therefore, typically, intracardiac portion 81 of closure device 80 has a greater radius of curvature than does extracardiac portion 83. In alternative applications, intracardiac portion 81 of closure device 80 has a smaller radius of curvature than does extracardiac portion 83. For some applications, intracardiac portion 81 and/or extracardiac portion 83 of the hole closure device is shaped as a flat disc, or is downwardly-concave. In accordance with respective applications, intracardiac portion 81 and extracardiac portion 83 have the same diameter as one another, or different diameters from one another.
Typically, intracardiac portion 81, plug portion 82, and extracardiac portion 83 of hole closure device 80 are movable with respect to each other such that the portions can conform to anatomical variations and asymmetry of the subject's heart. Further typically, intracardiac portion 81, plug portion 82, and extracardiac portion 83 of hole closure device 80 are movable with respect to each other such that the portions can maintain a seal around the hole in the heart, even when the heart moves, by portions 81, 82 and 83 moving with respect to each other, so as to conform to movement of the subject's heart.
As shown in
As shown in
For some applications, a central portion 89 of frame 87 is disposed inside plug portion 82 of the closure device. For example, the central portion of the frame may impart rigidity to the plug portion. Alternatively or additionally, the central portion of the frame may be configured to cause the plug portion to radially expand when the plug portion is in a non-constrained state. It is noted that even for applications in which a frame is disposed inside plug portion 82, nevertheless more than 50 percent of the non-constrained volume of the plug portion comprises an expansible material, as described hereinabove. Alternatively, more than 50 percent of the non-constrained volume of the plug portion comprises an arrangement of materials, such that the arrangement is expansible, even if the materials themselves are not substantially expansible. Furthermore, even for applications in which a frame is disposed inside plug portion 82, nevertheless, at least the outer layer of the plug portion, which comes into contact with the wall of the heart that defines the hole at the apex of the heart, typically includes a soft, absorbent material. Typically, having a plug portion having a soft outer layer reduces damage caused to myocardial tissue surrounding the hole in the heart by the hole closure, relative to a hole closure device that has a rigid (or partially rigid) outer layer thereof.
For some applications, frame 87 is pre-shaped such that the frame tends to shorten plug portion 82, when the wire structure is unconstrained. Typically, the longitudinal compression of the plug portion compresses tissue of the wall of the heart in the vicinity of the closure device thereby sealing the wall of the heart against the closure device. For some applications, the shortening of the plug portion causes the plug portion to expand radially. For some applications, plug portion 82 of the closure device is configured to expand radially even if the plug portion does not become longitudinally compressed. For some applications, frame 87 is pre-shaped so as to cause plug portion to expand radially, when the plug portion is not radially constrained by the catheter. Typically, the plug portion is made from an expansible material (e.g., a sponge). The plug portion is compressed when the plug portion is within the catheter and expands radially upon protruding from the catheter. Typically, the radial expansion of the plug portion seals the plug portion against the opening in the wall of the heart.
It is noted that closure device 80, as shown in
Reference is again made to
As described hereinabove, with reference to Step 14 of
Intracardiac portion 81 of the closure device 80 is deployed in the heart chamber by pushing the intracardiac portion out of the distal end of the working channel of cannula. As described hereinabove, the intracardiac portion is typically configured to automatically assume a shape that conforms with the inner surface of the wall of the heart (such as an upwardly concave disc-shaped shape) when the intracardiac portion is in a non-constrained state. Thus, the intracardiac portion assumes the shape, when the intracardiac portion is pushed out of the distal end of the cannula into the subject's heart, as shown in
Typically subsequent to the placement of intracardiac portion 81 of closure device 80 into the subject's heart, balloon 72, which is typically disposed at the distal end of inner tube of cannula 60, is deflated. The inner tube is typically then pulled proximally, thus pulling intracardiac portion 81 of the closure device against the inner surface of the wall of the heart, thereby placing the intracardiac portion in contact with the inner surface, as shown in
Closure device 80 is typically deployed such that extracardiac portion 83 of the device is deployed outside the pericardium. For some applications, the extracardiac portion is deployed between the myocardium and the pericardium. For some application, a portion of the pericardium is excised, and the extracardiac portion is deployed outside the myocardium.
Reference is now made to
When the distal end of the insertion device is disposed inside the subject's left ventricle, balloon 72 is deflated and inner tube 62 of cannula 60 is retracted into outer tube 64 of the cannula. In addition, suction of the suction cup is terminated. Subsequently, inner pushing element 114 of insertion device 110 is advanced through the outer tube 112, such as to push the intracardiac portion of the hole closure device out of the distal end of the outer tube, thereby causing the intracardiac portion to assume its non-constrained shape (e.g., a shape that conforms with the inner surface of the wall of the heart, as described hereinabove). For some applications, during the insertion of the hole closure device, a flexible elongate element (such as a wire 118), which is coupled to the hole closure device, protrudes from the proximal end of insertion device, as described in further detail with reference to
For some applications, during the advancement of insertion device 110 through the working channel of cannula 60, a safety element 116 that is coupled to the pushing element prevents the pushing element from being advanced distally with respect to the outer tube. Thus, the safety element prevents an operator from inadvertently pushing the hole closure device (or a portion thereof) out of the distal end of the outer tube, before the distal end of the outer tube is suitably disposed with respect to the subject's anatomy. For example,
Typically, before insertion device is advanced through cannula 60, hole closure device 80 is placed into the distal end of insertion device, into a position as shown in
Typically, if the safety element 116 has a length L as shown, then when the safety element is removed, this permits advancement of pushing element 114 with respect to outer tube 112 by length L. Further typically, the length L of the safety element is such that by advancing pushing element 114 with respect to outer tube 112 by length L, causes intracardiac portion 81 of the hole closure device to be pushed out of the distal end of outer tube 112, while plug portion 82 and intracardiac portion 83 remain inside the outer tube, as shown in
Reference is now made to
Typically, suture 119 is configured (based upon the material from which the suture is made, and/or the manner in which the suture is sutured to the hole closure device) to tear in response to a force of more than 6 N (e.g., more than 8 N) being applied to the suture by wire 118. For some applications, the tearing of the suture prevents the operator from inadvertently pulling the hole closure device out of the apex of the subject's heart by pulling the hole closure device proximally, subsequent to the deployment of intracardiac portion 81 inside the heart. Typically, suture 119 is configured (based upon the material from which the suture is made, and/or the manner in which the suture is sutured to the hole closure device) not to tear in response to a force of less than 4 N (e.g., less than 2 N) being applied to the suture by wire 118. For some applications, the operator by holding the proximal end of wire 118, while the wire is threaded through the suture, reduces the likelihood of distal migration of the hole closure device into the subject's left ventricle occurring, during deployment of the hole closure device. Thus, suture 119 and wire 118 act as a safety mechanism to reduce the likelihood of inadvertent advancement of the hole closure device into the subject's left ventricle occurring.
It is noted that, even in the absence of wire 118, hole closure device 80 is typically configured not to migrate distally into the subject's left ventricle, since, immediately upon being released from insertion device 110, extracardiac portion 83 of the hole closure device is configured to self expand, such that the extracardiac portion of the hole closure device is blocked from passing through the hole in the apex of the subject's heart. It is further noted that, although a suture is shown as being used to couple wire 118 to the hole closure device, for some applications a different coupling element is used. For example, a clip, a staple, and/or adhesive may be used to couple wire 118 to the hole closure device. Typically the coupling element is configured to break (e.g., by tearing or snapping) in response to a force of more than 4 N (e.g., more than 6 N) being applied to the coupling element by wire 118, and not to break in response to a force of less than 4 N (e.g., less than 3 N) being applied to the coupling element by wire 118. In general, the coupling element is configured to act as a mechanical fuse, by breaking upon a given amount of force being applied to the coupling element by the wire, such as to prevent the wire from pulling the hole closure device out of the apex of the subject's heart.
It is still further noted that although wire 118 has been described as being couplable to the hole closure device 80, by being threaded through suture 119, for some applications, a different flexible elongate element, e.g., a length of string, is used instead of wire. Typically, the flexible elongate element has a length of at least 64 mm, such that when the elongate element is doubled by being threaded through suture 119 (as shown in
It is noted that the scope of the present invention includes using insertion device 110 in combination with any of the apparatus or techniques described herein. It is further noted that the scope of the present invention includes using insertion device 110 in conjunction with a different self-expandable implantable medical device (e.g., a self-expandable stent and/or prosthetic valve). Safety element 116, which is coupled to the pushing element, prevents an operator from inadvertently pushing the self-expandable implantable medical device (or a portion thereof) out of the distal end of the outer tube, before the distal end of the outer tube is suitably disposed with respect to the subject's anatomy. When the distal end of the outer tube is suitably disposed with respect to the subject's anatomy, the safety element is removed from the pushing element. The pushing element is then pushed distally with respect to the outer tube, thereby pushing at least a portion of the self-expandable implantable medical device out of the distal end of the outer tube, and causing the portion to assume its non-constrained shape.
For some applications, intracardiac portion 81 and extracardiac portion 83 are connected to the plug by a connecting element (not shown), e.g., a metal or polymeric wire that surrounds the plug, and pulling of the metal wire results in pulling of the intracardiac portion and the extracardiac portion towards each other, causing the plug to expand within the passage, thereby improving sealing of the passage (application not shown).
For some applications, additional anchoring mechanisms may be used in combination with the closure device in order to maintain the closure device in place. Optionally, a biodegradable suture is sutured through the plug portion, and extended out to the skin. The suture typically facilitates anchoring of the plug portion within the passage to prevent dislodging of the plug into the heart. Eventually, the biodegradable suture is dissolved into the body. Any other suitable anchoring options may be used as well. For some applications, pushing element 86 is maintained in contact with the closure device for a period of time subsequent to the placement of the closure device at the apex, and applies pressure to portions of closure device 80, in order to ensure proper positing of the plug and to secure the plug in place. Element 86 may be removed any time following the closure procedure through drainage tubes which typically remain in a subject following surgical procedures. For some applications, pushing element 86 is configured to temporarily seal the passage in the heart wall until closure device 80 is properly situated.
For some applications, closure device 80 is shaped to define plug portion 82 and intracardiac portion 81, the intracardiac portion having a greater cross-sectional area than the plug portion (when the plug and intracardiac portions are in non-constrained states thereof), but the closure device does not include an extracardiac portion having a greater cross-sectional area than the plug portion (application not shown). For some applications, closure device 80 is shaped to define plug portion 82 and extracardiac portion 83 that has a greater cross-sectional area than the plug portion (when the plug and extracardiac portions are in non-constrained states thereof), but the closure device does not include an intracardiac portion having a greater cross-sectional area than the plug portion (application not shown). Alternatively, the closure device includes intracardiac portion 81 and extracardiac portion 83, each of which has a greater cross-sectional area than the plug portion (when the plug, intracardiac, and extracardiac portions are in non-constrained states thereof), as shown in
For some applications, closure device 80, or a portion thereof (e.g., plug portion 82) is configured to absorb blood, and includes coagulation-facilitating elements (not shown) that are configured to facilitate coagulation of the blood inside the closure device. For some applications, the coagulation-facilitating elements are coiled metallic elements, and/or other coagulation-facilitating elements that are known in the art. Alternatively or additionally, a surface of the closure device (e.g., a surface of intracardiac portion 81 of the device), and/or a portion of the device, is coated with a coagulation-facilitating coating, such as fibrin, and/or is covered with a material that contains fibrin. For some applications, the entire closure device is coated with a coagulation-facilitating coating, such as fibrin, and/or is covered with a material that contains fibrin.
For some applications, closure device 80 includes portions that comprise a shape-memory material, such as nitinol. For some applications, one or more tissue-coupling elements (e.g., pins, not shown) are disposed on intracardiac portion 81 and/or extracardiac portion 83 of the closure device. The tissue-coupling elements are pre-shaped, such that when the closure device is positioned within the wall of the heart, the tissue-coupling elements couple the closure device to the wall of the heart by becoming embedded in tissue of the wall of the heart.
For some applications, closure device 80 defines one or more channels therethrough (or through a portion thereof, application not shown). The closure device is configured such that, upon placement of the closure device within the wall of the heart, blood flows through the channels at a low flow rate. The slow blood flow through the channels facilitates coagulation of the blood within the channels, e.g., by causing stagnation flow thrombosis, thereby sealing the closure device. For some applications, a closure device that defines channels therethrough is used, the closure device or a portion thereof being made of a reticulated elastomeric material, and/or a reticulated foam that comprises polyurethane, polycarbonate polyurethane-urea, and/or a similar material.
It is noted that the scope of the present invention includes using the closure devices described herein (e.g., one or more of the devices described with reference to
Reference is now made to
For some applications, in order to facilitate the insertion of the tool through plug portion 82, the plug portion is first cut, for example, in order to facilitate the insertion of the tool through the plug portion subsequent to the plug portion having hardened due the build-up of fibrotic matter within the plug portion. Typically a protective structure is placed inside the subject's left ventricle, before the plug portion is cut, in order to prevent tissue of the left ventricle from being injured during the cutting of the plug portion.
For some applications, in a first step of the procedure, a guidewire 120 is inserted into plug portion 82 of hole closure device 80 (typically, by fluoroscopic guidance, using the Seldinger technique). Subsequently, an inner sheath 123 and a slitted outer sheath 124 that is disposed around the inner sheath are advanced through the plug portion over the guidewire, as shown in
Reference is now made to
Typically, hole closure device 80 and second device 130 are coupled to one another, and are inserted into the left ventricle by being advanced simultaneously with one another. In accordance with respective applications, the second device (e.g., the partitioning device) is disposed symmetrically or asymmetrically with respect to the hole closure device. For some applications, the hole closure device is coupled to the second device via a coupling element 132 (as shown). In accordance with respective applications, the hole closure device is flexibly coupled to the second device, such as to facilitate relative motion between the hole closure device and the second device, or the hole closure device is rigidly coupled to the second device. For some applications, the hole closure device includes intracardiac portion 81, plug portion 82 and extracardiac portion 83. Alternatively, the hole closure device that is coupled to the second device defines only some of the aforementioned portions. For example, a hole closure device that defines a plug portion and an extracardiac portion, but that does not define an intracardiac portion, may be coupled to the second device. For some applications (e.g., for applications in which the second device is a left-ventricular partitioning device), the second device is disc shaped, and the second device functions as the intracardiac portion of the hole closure device in addition to a second function of the second device (e.g., left-ventricular partitioning).
Typically, the hole closure device is configured to self-expand such that the hole closure device self-anchors to the apex of the subject's heart, thereby sealing the apex, as described hereinabove. Thus, for applications in which the hole closure device is coupled to the second device, the hole closure device is configured (a) to anchor the second device within the left ventricle, and (b) to seal the hole is the apex of the subject's heart.
For some applications, hole closure device 80 and second device 130 are configured to be inserted into the apex of the subject's heart by being advanced through the subject's chest toward the subject's apex, e.g., via cannula 60 described hereinabove. For such applications, when the second device is disposed inside the left ventricle, the second device is expanded. Subsequently the hole closure device is expanded, such as to anchor the second device within the left ventricle, and such as to seal the hole in the apex. Alternatively, hole closure device 80 and second device 130 are configured to be advanced toward the subject's left ventricle transfemorally, e.g., by being advanced through catheter 12 described hereinabove, or by being advanced through a different transfemoral catheter, such as a transfemoral catheter having a larger diameter than catheter 12. The hole closure device is deployed such that the extracardiac portion of the device is disposed outside the subject's apex, and such that the intracardiac portion is disposed inside the subject's heart adjacent to the apex. Subsequently, the second device is expanded inside the subject's left ventricle.
It is noted that although second device 130 has been described as being a left-ventricular partitioning device, the scope of the present invention includes any second device that is coupled to hole closure device, such that the hole closure device is configured (a) to anchor the second device within the subject's left ventricle, and (b) to seal the hole in the subject's apex.
Reference is now made to
For some applications, adaptor 140 is used in order to facilitate the use of a standard working catheter that is used to perform the cardiac interventional procedure via cannula 60. Typically, the distal end of the adaptor is couplable to the proximal end of the catheter, for example using clips and/or a snap-and-lock mechanism. Typically, adaptor 140 defines a lumen that is sized such as to accommodate and/or guide a standard working catheter that is used to perform the procedure. For example, the lumen may have a diameter of more than 8 mm and/or less than 12 mm (e.g., 8-12 mm), such as to accommodate and/or guide a Transcatheter Aortic-Valve Implantation (TAVI) introducer sheath.
Reference is again made to
For some applications, inner tube 62 includes a marking (not shown) thereon, such as to indicate to a user when the distal end of the inner tube (or a different portion of the inner tube) is disposed adjacent to the distal end of the outer tube. For example, the inner tube may include a marking that becomes visible at the proximal end of the inner tube, when the distal end of the inner tube is adjacent to the distal end of the outer tube. Thus, by (a) retracting the outer tube until the suction cup is in contact with the distal end of the trocar, (b) placing the spacing element on the outer tube, and (c) observing the marking on the inner tube, a user may determine that the distal end of the inner tube (or a different portion of the inner tube) is disposed in the vicinity of the distal end of the trocar. In this manner, the user may verify that the inner tube has been refracted such that the distal end of the inner tube is no longer disposed inside the subject's left ventricle.
Reference is now made to
Insertion device 150 defines an outer tube 152, and an inner pushing element 154 disposed inside the outer tube. A handle 155 is disposed at the proximal end of the pushing element, via which a user advances the pushing element. As described hereinabove, typically, hole closure device 80 is advanced to the hole in the apex of the heart in a compressed and/or folded state thereof inside the insertion device, and is subsequently expanded into an operable state. For some applications, in the expanded state of the hole closure device, the intracardiac and extracardiac portions of the hole closure device define discs (e.g., concave or flat discs), and in the compressed state of the hole closure device, during insertion of the hole closure device, the discs are folded. Insertion device 150 is configured to be advanced through the working channel (e.g., inner tube 62) of cannula 60 while the hole closure device is disposed within outer tube 152 (e.g., as shown in
In accordance with respective applications, the hole closure device is advanced toward the apex over a guidewire (e.g., first guidewire 10 or a second guidewire), or the guidewire is removed from the apex prior to the hole closure device being advanced toward the apex. For applications in which the hole closure device is advanced toward the apex over a guidewire, plug portion 82 of the hole closure device includes a self-sealing septum that is configured to seal the plug portion subsequent to the retraction of the guidewire through the plug portion.
Typically, while balloon 72 is in an inflated state inside the left ventricle, the distal end of insertion device 150 is inserted into the left ventricle, via cannula 60, such that the distal end of the insertion device is disposed distally to the inflated balloon. Subsequently, inner pushing element 154 of insertion device 150 is advanced through outer tube 152, by a user pushing handle 155, such as to push the intracardiac portion of the hole closure device out of the distal end of the outer tube, thereby causing intracardiac portion 81 of hole closure device 80 to assume its non-constrained shape. Subsequent to the intracardiac portion of the hole closure device having been pushed out of the distal end of the outer tube, suctioning of suction cup 77 is terminated, balloon 72 is deflated, and inner tube 62 of cannula 60 is retracted into outer tube 64 of the cannula. For some applications, when insertion device 110 is used, a similar sequence is followed. Namely, the intracardiac portion of the hole closure device is pushed out of the distal end of the outer tube of the insertion device into the left ventricle, and, only subsequently, suctioning of suction cup 77 is terminated, balloon 72 is deflated, and inner tube 62 of cannula 60 is retracted into outer tube 64 of the cannula. Alternatively, a sequence as described hereinabove with reference to insertion device 110 is used in conjunction with insertion device 150. Namely, when the distal end of the insertion device is disposed inside the subject's left ventricle, suctioning of the suction cup is terminated, balloon 72 is deflated, and inner tube 62 of cannula 60 is retracted into outer tube 64 of the cannula. Subsequently, inner pushing element 154 of insertion device 150 is advanced through the outer tube 152, such as to push the intracardiac portion of the hole closure device out of the distal end of the outer tube, thereby causing the intracardiac portion to assume its non-constrained shape
For some applications, during the insertion of the hole closure device, a flexible elongate element (such as a wire 118), which is coupled to the hole closure device, protrudes from the proximal end of insertion device 150, e.g., as described hereinabove with reference to insertion device 110.
For some applications, insertion device 150 includes one or more motion-impeding mechanisms configured to impede distal advancement of the pushing element with respect to the outer tube. For some applications, during the advancement of insertion device 150 through the working channel of cannula 60, a first safety element 156 (e.g., a clip, as shown) that is coupled to the pushing element, acts as a motion-impeding mechanism, by preventing the pushing element from being advanced distally with respect to the outer tube. Thus, the safety element prevents an operator from inadvertently pushing the hole closure device (or a portion thereof) out of the distal end of the outer tube, before the distal end of the outer tube is suitably disposed with respect to the subject's anatomy. For example,
Typically, if the safety element 156 has a length L1 as shown in
For some applications, in addition to safety element 156, a second safety element 158 (e.g., a clip, as shown) is coupled to pushing element 154. Second safety element acts as a motion-impeding mechanism, by impeding distal advancement of the pushing element with respect to the outer tube such that, even after the first safety element is removed and the user pushes handle 155 distally, only intracardiac portion 81 (and, optionally, a portion of the plug portion 82) will protrude from outer tube 152 of the insertion device, but the extracardiac portion will remain inside the outer tube of the insertion device, due to the safety element impeding further advancement of handle 155. In this manner, the second safety element reduces the likelihood of the extracardiac portion being pushed out of the outer tube while the distal end of the outer tube is disposed inside the left ventricle, which might result in the hole closure device migrating into the subject's heart. For some applications, in addition to including the second safety element, the insertion device includes a threaded portion 160 that defines a threaded outer surface. The threaded outer surface of the threaded portion of the insertion device acts as a motion-impeding mechanism, by impeding distal advancement of the pushing element with respect to the outer tube. The threaded portion is typically disposed on the insertion device such that in order to advance pushing element 154 such as to push extracardiac portion 83 of the hole closure device out of the distal end of outer tube 152, handle 155 is advanceable over the portion only by being screwed around the threaded outer surface.
Typically, subsequent to removing first safety element 156 and pushing intracardiac portion 81 of hole closure device 80 out of the distal end of outer tube 152 of insertion device 150, the insertion device is gently pulled proximally, thus pulling intracardiac portion 81 of the closure device against the inner surface of the wall of the heart. Subsequently, second safety element 158 is removed from the insertion device, and the user simultaneously (a) gently pulls the insertion device proximally, and (b) screws handle 155 over threaded portion 160, such as to slowly advance pushing element 154. The pushing element is advanced, while the insertion device is pulled proximally, such as to release extracardiac portion 83 of the hole closure device, when the distal end of outer tube 152 of the insertion device is disposed outside the subject's left ventricle. Typically, advancing the pushing element while gently pulling the insertion device proximally in the described manner reduces the likelihood of the entire hole closure device being pulled proximally out of the subject's heart, relative to if the extracardiac portion of the hole closure device were to be released by simply pulling the insertion device proximally subsequent to the opening of the intracardiac portion of the hole closure device inside the subject's left ventricle. Typically, upon being pushed out of the distal end of the insertion device, the extracardiac portion of the hole closure device opens to define a disc shape (e.g., a concave or a flat disc), as is generally hereinabove.
To summarize, the motion-impeding elements of insertion device 150 are thus typically configured to provide the following protections. First safety element 156 is configured to prevent inadvertent expansion of intracardiac portion 81 of hole closure device 80, before the distal end of the insertion device is suitably disposed inside the subject's left ventricle. Second safety element 158 is configured to prevent inadvertent deployment of extracardiac portion 83 of the hole closure device, which could result in the hole closure device migrating into the left ventricle. Threaded portion 160 facilitates the gradual deployment of the extracardiac portion of the hole closure device outside the subject's heart, at the same time as the gentle pulling of the insertion device proximally, such as to bring the intracardiac portion of the hole closure device into contact with the inner surface of the wall of the heart.
It is noted that, although motion-impeding mechanisms and safety elements have been described herein as including a clip and/or a threaded portion, the scope of the present invention include using other components for these purposes, mutatis mutandis. For example, a clamp, a screw, a pin, a nut, a bolt, a clasp, a stopper, a hook, a catch, and/or a similar component may be used.
For some applications of the present invention, intracardiac portion 81, and extracardiac portion 83 of the hole closure device are not formed as a single integral structure. Rather, the extracardiac portion may be couplable to the intracardiac portion via plug portion 82, or the intracardiac portion may be couplable to the extracardiac portion via the plug portion. For some applications, initially, the intracardiac portion is placed inside the subject's heart, and, subsequently, the extracardiac portion is coupled to the intracardiac portion via the plug portion.
For some applications, the extracardiac portion is couplable to the intracardiac portion in such a manner that the length of the plug portion may be modulated during the coupling of the extracardiac portion to the intracardiac portion. For example, the extracardiac portion may be couplable to the intracardiac portion via sutures that extend from the intracardiac portion and/or from the plug portion. The extracardiac portion is pushed along the sutures such as to axially compress the plug portion, and thereby change the length of the plug portion, by a desired amount. Subsequently, the sutures are tied such as to fix the position of the extracardiac portion with respect to the intracardiac portion, to thereby fix the length of the plug portion.
For some applications, a ratchet mechanism is used to couple the extracardiac portion to the intracardiac portion. Alternatively, the extracardiac portion may be coupled to the intracardiac portion in a different manner, and, separately, a ratchet mechanism is used to modulate the distance between the intracardiac portion and the extracardiac portion. When the hole closure device has been placed inside the hole in the subject's heart, the ratchet mechanism is used to modulate the length of the plug portion, and to maintain the length of the plug portion at a fixed length, once the length of the plug portion has been set at a desired length.
As described hereinabove, in Step 6 of the procedure that is shown in the flowchart of
For some applications of the present invention, subsequent to guidewire 10 being passed to outside the subject's chest, a second guidewire (not shown) is coupled to the portion of guidewire 10 that is disposed outside the subject's chest. Typically, the second guidewire is thicker than the first guidewire. For example, first guidewire 10 may have a diameter of between 0.3 mm and 0.4 mm, and the second guidewire may have a diameter of between 0.9 mm and 1.1 mm. Typically, the ends of guidewire 10 and the second guidewire are coupled to one another. Subsequent to the coupling of the second guidewire to guidewire 10, guidewire 10 is retracted such that the distal end of guidewire 10 passes back into the subject's chest cavity, and then through the subject's apex into the subject's left ventricle, and such that the second, thicker guidewire forms a path from outside wall 5 of the patient's chest and into the subject's left ventricle 4, via apex 6 of the left ventricle. For some applications, at least a portion of the remainder of the procedure (e.g., a cardiac interventional procedure as described hereinabove) is performed using tools that are guided from outside the subject's chest to the subject's apex, via the second guidewire.
Typically, for applications in which a second guidewire is coupled to guidewire 10, subsequent to the coupling of the second guidewire to guidewire 10, guidewire 10 is retracted such that the distal end of guidewire 10 is disposed inside the subject's aorta, or further toward the access point in the peripheral artery via which guidewire 10 was inserted. Further typically, the piercing element that was used to pierce the hole in the subject's apex via which guidewire 10 was inserted, is also retracted such that the piercing element is disposed inside the subject's aorta, or even further toward the access point in the peripheral blood vessel, via which the first guidewire was inserted.
As described hereinabove (for example, with reference to Step 8 of the procedure that is shown in the flowchart of
For some applications, an expandable element other than the suction cup is disposed at the distal end of outer tube 64 of cannula 60, and is configured to be placed on the outer surface of the subject's heart around the hole in the subject's apex, such as to form a seal around the hole. One or more electrodes are coupled to the distal side of the expandable element, and rapid pacing is applied to the subject's heart, by a control unit driving a current into the apex of the heart via the electrodes.
As described hereinabove (for example, with reference to Step 10 of the procedure that is shown in the flowchart of
For some applications, in order to ensure that the balloon is disposed inside the subject's left ventricle before inflation of the balloon is initiated, inner tube 62 includes one or more verification elements.
For example, at least one electrode (not shown) may be coupled to inner tube 62 proximally to balloon 72. The electrode functions as a verification element, and a user determines that the balloon is disposed inside the subject's left ventricle responsively to an electrical parameter detected by the electrode. For example, in response to a signal generated by the electrode having a shape of an ECG signal, it may be determined that the electrode is currently disposed within myocardial tissue. If in response to the inner tube being pushed distally, the signal having the shape of the ECG signal is no longer detected, it may be determined that the electrode has now passed through the myocardial tissue and is disposed inside the left ventricle. Since the electrode is disposed proximally to balloon 72, it may thereby be determined that the balloon is disposed inside the left ventricle.
Alternatively or additionally, inner tube 62 of cannula 60 may define an opening (not shown) proximally to balloon 72, the opening leading to a channel (not shown) defined by inner tube 62. For some applications, the channel leads to a location, e.g. a window (not shown), which is visible to the user at the proximal end of the cannula that is disposed outside the subject's body. In response to the portion of the inner tube that defines the opening entering the left ventricle, blood enters the opening and flows through the channel to the window. Thus, when blood is visible at the window, this is indicative that the opening is disposed inside the left ventricle. Since the opening is disposed proximally to balloon 72, it may thereby be determined that the balloon is disposed inside the left ventricle.
Further alternatively or additionally, a pressure sensor (not shown) may be coupled to inner tube 62 of cannula 60, proximally to balloon 72. The pressure sensor functions as a verification element, and the user determines that the balloon is disposed inside the subject's left ventricle responsively to a signal generated by the pressure sensor indicating that the pressure sensor is disposed inside the subject's left ventricle (for example, in response to the sensor generating a signal that is pulsatile, and/or in response to there being a change in pressure that is indicative of the pressure sensor having entered the left ventricle). Since the pressure sensor is disposed proximally to balloon 72, a signal that is indicative of the pressure sensor being disposed inside the left ventricle is indicative of the balloon being disposed inside the left ventricle.
The procedures described hereinabove are described with reference to the left ventricle of the heart by way of illustration and not limitation. It is to be noted that any of the above mentioned procedures may be performed on any heart chamber, and/or more than one heart chamber, as appropriate. For applications in which access to the left side of the heart is desirable, percutaneous cardiac catheterization through the femoral or radial artery is performed. Typically, applications that provide access to the left ventricle are particularly suitable for cardiac procedures such as aortic valve and/or mitral valve repair and/or replacement. It is to be noted that any other percutaneous cardiac catheterization procedure known in the art can be used to gain access to the left side of the heart, e.g., via the femoral vein and through a foramen ovale in the wall between the atria. For some applications, femoral vein catheterization in a retrograde direction is performed, in order to gain access to the right side of the heart. Access to the right side of the heart is particularly suitable for cardiac procedures such as, by way of illustration and not limitation, pulmonary valve and/or tricuspid valve repair or replacement.
Furthermore, it is noted that although techniques are described hereinabove by way of example, the scope of the present invention includes performing similar techniques on other organs or lumen, such as other sites in the cardiovascular system, the stomach, or the urinary bladder.
It is to be noted that any of the procedures described herein may be conducted under fluoroscopy or any other image guidance known in the art.
It is additionally noted that although some embodiments of the present invention are described hereinabove with respect to use of a catheter passed into the femoral artery (or another peripheral blood vessel) over a guidewire, the scope of the present invention includes passing a single guidewire into the peripheral vessel, into a chamber of the heart, and subsequently creating a passage in the wall of the heart using the guidewire and passing the guidewire through the passage, until the guidewire reaches the skin. The distal tip of the guidewire may be used to puncture or electrically ablate the wall of the heart, in order to create the passage.
For some applications, some or all of the components usable in a given procedure described hereinabove are packaged in a kit.
For some applications of the present invention, a magnet is directed toward the inside of the apex of the subject's heart. For example, a magnet disposed on the end of a guidewire may be inserted via a femorally-inserted catheter, or via a radially-inserted catheter. Alternatively, the femorally-inserted or radially-inserted catheter itself may have a magnetic distal tip. In addition, a trocar is inserted through the subject's chest toward the subject's apex. A catheter is inserted toward the subject's apex, via the trocar. The distal end of the catheter is made of a magnetic material. The magnet that is placed inside the subject's heart at the subject's apex is used to guide the catheter to the outside of the apex of the subject's heart and/or to maintain the catheter at the apex, by magnetically attracting the catheter. When the catheter has been guided to the outside of the apex, a needle, and/or a sharp-tipped catheter is inserted via the catheter toward the apex and is used to pierce the apex from the outside of the apex. A guidewire is inserted through the subject's chest and through the apex, via the catheter and/or via the sharp-tipped catheter. For some applications, the guidewire is inserted through the sharp-tipped catheter subsequent to the piercing of the apex by the sharp-tipped catheter. Alternatively, the guidewire is inside the sharp-tipped catheter during the guiding of the sharp-tipped catheter toward the apex, and/or during the piercing of the apex by the sharp-tipped catheter. For some applications, the distal tip of the guidewire that is inserted through the sharp-tipped catheter is made of a magnetic material and the magnet inside the subject's heart is used to attract the guidewire toward the apex. A transapical procedure is subsequently performed within the subject's heart, using the guidewire to guide tool through the subject's chest and the subject's apex.
It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove, as well as variations and modifications thereof that are not in the prior art, which would occur to persons skilled in the art upon reading the foregoing description.
The present application is a continuation-in-part of International Application PCT/IL2013/050187 (published as WO 13/128,461), entitled “Minimally invasive surgical techniques,” filed Feb. 28, 2013, which claims priority from U.S. Provisional Patent Application 61/604,581, entitled “Minimally invasive surgical techniques,” filed Feb. 29, 2012. The present application is related to International Patent Application No. PCT/IL2011/000685 (published as WO 12/025,927), entitled “Minimally invasive surgical techniques,” filed Aug. 24, 2011, which claims the benefit of: U.S. Provisional Patent Application 61/376,897, entitled “Minimally invasive surgical procedure,” filed Aug. 25, 2010; U.S. Provisional Patent Application 61/452,465, entitled “Minimally invasive surgical techniques,” filed Mar. 14, 2011; and U.S. Provisional Patent Application 61/475,751, entitled “Minimally invasive surgical techniques,” filed Apr. 15, 2011. All of the above applications are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61604581 | Feb 2012 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/IL2013/050187 | Feb 2013 | US |
| Child | 14471512 | US |
