The present disclosure generally relates to devices, systems, and methods for delivering an interventional device to targeted anatomy such as at the mitral annulus.
Intravascular medical procedures allow the performance of therapeutic treatments in a variety of locations within a patient's body while requiring only relatively small access incisions. An intravascular procedure may, for example, eliminate the need for open-heart surgery, reducing risks, costs, and time associated with an open-heart procedure. The intravascular procedure also enables faster recovery times with lower associated costs and risks of complication.
An example of an intravascular procedure that significantly reduces procedure and recovery time and cost over conventional open surgery is a heart valve replacement or repair procedure in which an artificial valve or valve repair device is guided to the heart through the patient's vasculature. For example, a catheter is inserted into the patient's vasculature and directed to the inferior vena cava. The catheter is then urged through the inferior vena cava toward the heart by applying force longitudinally to the catheter. Upon entering the heart from the inferior vena cava, the catheter enters the right atrium. The distal end of the catheter may be deflected by one or more deflecting mechanisms, which can be achieved by tension cable, or other mechanisms positioned inside the catheter. Precise control of the distal end of the catheter allows for more reliable and faster positioning of a medical device and/or implant and other improvements in the procedures.
An intravascularly delivered device needs to be placed precisely to ensure a correct positioning of the medical device, as the device may be difficult to reposition after the device is fully deployed from the delivery system. Additionally, the ability to recapture a partially deployed device is desirable in the event that the distal end of the catheter moves relative to the target location and compromises the precise positioning of the device.
In order to describe the manner in which the above-recited and other advantages and features of the invention can be obtained, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
One or more specific embodiments of the present disclosure will be described below. In an effort to provide a concise description of these embodiments, some features of an actual embodiment may be described in the specification. It should be appreciated that in the development of any such actual embodiment, as in any engineering or design project, numerous embodiment-specific decisions will be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one embodiment to another. It should further be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
Embodiments of the present disclosure solve one or more problems in the art with systems, methods, and devices for intravascular delivery of an interventional device to targeted intravascular anatomy, including a targeted cardiac valve. Suitable interventional devices that may be utilized in conjunction with the delivery system embodiments described herein may include valve repair devices, annuloplasty devices, valve clip devices, artificial heart valve devices, and other interventional devices. Embodiments described herein may be particularly useful for delivering interventional devices that move from a compressed, pre-deployed state to an expanded, deployed state.
The proximal end of an outer sheath 82 is coupled to an end ring 131, and the outer sheath 82 extends to a distal tip 88. A steering catheter handle 132 is disposed proximal of the end ring 131. The proximal end of a steering catheter 80 is coupled to the steering catheter handle 132, and the steering catheter 80 extends distally from the steering catheter handle 132 into the outer sheath 82. The steering catheter handle 132 includes one or more controls 134 which are operatively coupled to the steering catheter so that manipulation of the controls 134 adjusts the curvature of the steering catheter 80.
The outer sheath 82 extends to a distal end where it is coupled to a distal piece 84 (which may also be referred to herein as a “valve cover 84”). The distal piece 84 functions to house an interventional device in a compressed, pre-deployed state during intravascular delivery of the device to the targeted cardiac site.
Because the steering catheter 80 is nested within the outer sheath 82, curving of the steering catheter 80 causes corresponding curving/steering in the outer sheath 82. The steering catheter 80 and outer sheath 82 may be referred to singly or collectively herein as the “outer member.” The illustrated embodiment of the delivery member 70 includes additional components which are not visible in the view of
The steering catheter 80 is configured to be selectively curved to allow intravascular navigation. In some embodiments, the steering catheter 80 provides steerability via tension cables 83 received within a plurality of lumens 81 that extend through the length of the steering catheter 80. The lumens 81 may be configured for receiving tension cables 83 which extend between the controls 134 and the distal end of the steering catheter 80. One or more tension cables may additionally or alternatively be coupled to intermediate sections of the steering catheter 80. Manipulation of the controls 134 therefore adjusts tension in the tension cables to increase or decrease curvature of the steering catheter 80 at various positions. Although the controls 134 are shown here as knobs, alternative embodiments may additionally or alternatively include one or more buttons, sliders, ratcheting mechanisms, stepper motors, or other suitable controls capable of adjusting tension to provide steering. Illustrative structures that can be used as part of the steering catheter handle 132 and or steering catheter 80 are described in U.S. Pat. No. 7,736,388, which is incorporated herein by this reference.
Referring to
An inner catheter control 139 is operatively coupled to the inner catheter holder 138. Manipulation of the inner catheter control 139 adjusts the relative positioning of the delivery catheter holder 136 and inner catheter holder 138, and thus the relative positioning of the delivery catheter 78 and the inner catheter 72. In the illustrated embodiment, the inner catheter control 139 operates through threaded engagement with the inner catheter holder 138, such that rotation of the inner catheter control 139 translates the inner catheter holder 138 relative to the control 139 and therefore relative to the delivery catheter holder 136. Alternative embodiments may additionally or alternatively include one or more of a slider and rail assembly, a ratcheting mechanism, or other suitable means of linear adjustment.
The inner catheter 72 may extend proximally to and be attached to an inner catheter cap 143. A user may decouple the inner catheter 72 from the inner catheter holder 138 to allow movement of the inner catheter 72 by sliding/translating the inner catheter cap 143 along alignment rods 142. The guidewire tube 86 extends distally through the alignment cap 143 and into the inner catheter 72. The guidewire tube 86 extends to the distal end of the delivery member 70 where it is attached to a distal tip 88. The distal tip 88 is preferably formed from a flexible polymer material and provides a tapered, atraumatic shape which assists in passing the delivery member 70 through the vasculature and across the inter-atrial septum to the mitral annulus, which is required in a typical transfemoral approach to the mitral annulus.
In the illustrated embodiment, the guidewire tube 86 is coupled to a guidewire tube holder 140. By moving the guidewire tube holder 140, the guidewire tube 86 may be selectively translatable relative to the inner catheter cap 143 such that the guidewire tube 86 and distal tip 88 may be linearly translated relative to the inner catheter 72 and other components of the delivery member 70. The guidewire tube 86 may be selectively locked in longitudinal position relative to the inner catheter holder 138 and/or inner catheter cap 143, such as through a set screw, clamp, or other selective fastener. For example, such a fastening structure may be associated with the inner catheter cap 143.
When unlocked, the guidewire tube 86 (and likewise the distal tip 88) may be moved relative to the inner catheter 72. The ability to retract the distal tip 88 relative to the inner catheter 72 reduces the risk that the distal tip 88 will become overextended during deployment, where it could become tangled in chordae tendineae and/or cause injury to cardiac tissue. Additionally, independent movement of the guidewire tube 86 (with the distal tip 88) also allows for closing the gap between the distal tip 88 and the valve cover 84 following deployment of the intravascular device. When the intravascular device has been released, the distal tip 88 is separated from the valve cover 84 by a distance, such as by about 10 mm to about 100 mm, from about 20 mm to about 80 mm, from about 30 mm to about 50 mm, or about 40 mm. To avoid drawing air into the catheter, the gap between valve cover 84 and distal tip 88 is closed by drawing the distal tip 88 towards the valve cover 88, preferably in the left side of the heart, to avoid sucking air into the catheter when pulled back into the right side of the heart (where there is relatively low pressure).
In other implementations, such as for procedures associated with a tricuspid valve, the delivery member 70 may be passed through the inferior vena cava 150 and into the right atrium 152, where it may then be positioned and used to perform the procedure related to the tricuspid valve. As described above, although many of the examples described herein relate to delivery to the mitral valve, one or more embodiments may be utilized in other cardiac procedures, including those involving the tricuspid valve.
Although a transfemoral approach for accessing a targeted cardiac valve is one preferred method, it will be understood that the embodiments described herein may also be utilized where alternative approaches are used. For example, embodiments described herein may be utilized in a transjugular approach, transapical approach, or other suitable approach to the targeted anatomy. For procedures related to the mitral valve or tricuspid valve, delivery of the replacement valve or other interventional device is preferably carried out from an atrial aspect (i.e., with the distal end of the delivery member 70 positioned within the atrium superior to the targeted valve). The illustrated embodiments are shown from such an atrial aspect. However, it will be understood that the interventional device embodiments described herein may also be delivered from a ventricular aspect.
In some embodiments, a guidewire 87 is utilized in conjunction with the delivery member 70. For example, the guidewire 87 (e.g., 0.014 in diameter, 0.018 in diameter, 0.035 in diameter) may be routed through the guidewire tube 86 of the delivery member 70 to the targeted cardiac valve.
Additional details regarding delivery systems and devices that may be utilized in conjunction with the components and features described herein are described in United States Patent Application Publication Numbers 2018/0028177A1 and 2018/0092744A1, which are incorporated herein by this reference.
As shown by corresponding arrows 180, rotation of the outer sheath adjustor 174 in one direction causes the slider block 167 to advance, and as shown by corresponding arrows 181, rotation of the outer sheath adjustor 174 in the opposite direction causes the slider block 167 to retract. In
The deployment adjustor 175 is threadedly engaged with the delivery catheter support 170. The connecting rods 177 mechanically link the delivery catheter support 170 to the slider block 167 to form a bracket assembly. The connecting rods 177 are able to freely pass through the steering catheter handle support 169 without engaging. The delivery catheter holder 136 and the suture catheter holder 138 are also mechanically linked as part of the bracket assembly by way of the alignment ring 137 and suture catheter control 139. Accordingly, rotation of the deployment adjustor 175 causes the delivery catheter holder 136, slider block 167, and suture catheter holder 138 to translate while the position of the steering catheter handle 132 is maintained. Translation of the outer sheath support 166 can be assured by locking to the slider block 167.
Attached to the proximal end of bending portion 234 is a cut hypotube 242 that extends from bending portion 234 to the proximal end of the sheath 82. Hypotube 242 can include a plurality of slits and at least one longitudinally continuous spine that can preferably be continuous and uninterrupted along a longitudinal length of, and located at a fixed angular location on, hypotube 242.
In such embodiments, it can be desirable for the bending portion 234 of delivery catheter to remain liquid tight. To seal the bending portion 234, a flexible, fluid impermeable covering can be provided over the coil/braid portion 236/238, extending from the distal piece 84 to a location proximal the coil/braid portion 236/238. For example, the delivery sheath 82 can also include a thin walled flexible cover 240 that extends from the distal piece 84 to the hypotube 242. Flexible cover 240 can be bonded at each end to the underlying structure, using one of a variety of different adhesives, thermal adhesives, UV bonded adhesive, or other techniques.
Referring again to
In some embodiments, the steering catheter 80 is rotationally keyed to the outer sheath 82. The outer sheath 82 may include cut patterns and/or other features which are arranged to provide particular preferred bending directions. In this embodiment, because bending of the outer sheath 82 depends upon curving of the steering catheter 80, rotational alignment of the outer sheath 82 to the steering catheter 80 is beneficial. These components may be keyed together using a key and corresponding keyway feature, slots and corresponding tabs, or other rotational keying mechanism known in the art. Alternatively, or additionally, alignment markers can be provided at the handle assembly to visually indicate alignment.
To provide effective steering and positioning at the mitral annulus, the distal section 314 is cut with a pattern which allows a bending radius of about 15 mm or less (e.g., 5 to 15 mm). The intermediate section 316 is cut to allow a bending radius of about 30 to 45 cm. The proximal section is uncut to provide the steering catheter 80 with sufficient stiffness, torquability, and pushability and also the ability to flush the system.
In one embodiment, illustrated in
The delivery catheter 78 also includes a can structure 410 disposed at the distal end. The can 410 is configured to constrain and hold at least a proximal section of a collapsible/expandable interventional device 10. Without such constraint, the outer portion of the device 10 may bias radially outward against the inner surface of the overlying components of the delivery member 70, making it more difficult to unsheathe or re-sheathe the device 10.
The can 410 may also have a length sufficient to aid in maintaining coaxial alignment of the distal end of the delivery catheter 78 within the delivery member 70 to avoid or minimize unwanted tilting. For example, the can 410 preferably has a length to diameter ratio of greater than or equal to 1, though in alternative embodiments the ratio may be smaller, such as about 0.25 to 1, depending on the stiffness of the distal section 402. In still other configurations, the can 410 can take the form of a plate and so have no depth. In some The can 610 also provides an effective structural surface to act as a counterforce to maintain the interventional device 10 in the proper pre-deployed position when the outer member is retracted. In some embodiments, one or more edge portions of the can 410 include a taper and/or smooth surface for easier sliding of the can 410 within the outer member.
As shown by
Additional details related to coils structures, coil braid structures, collapsing of the valve, and retrieval of the valve will now be presented. It will be understood that any of the structures, methods and functional aspects of the coil structures, coil braid structures, methods and structures for collapsing of the valve, and methods and structures for retrieving the valve can be used with or combined with any other structure, methods, apparatuses, and functional aspects described herein.
To achieve high forces when re-sheathing a valve, a coil can be both flexible and withstand high compression forces without collapsing. In general, stacked coils can be somewhat flexible, but if the thickness of the coil is limited, they can tend to collapse under high compression, such that single coils shift transversely to a longitudinal axis of the coil as a whole. This can occur, such as when the coil is not constrained on either the inside diameter (ID) or outside diameter (OD) of the coil.
To overcome this limitation, a coil section 500 can be formed of a plurality individual coil elements 502 that are mounted on elongate members 504, such as wires, sutures, or other elongate members running through holes 506 of the individual coil elements 502, as illustrated in the
Illustrated in
For instance, there can be less than or greater than 3 pairs of holes 506 formed in the coil elements 502 and so the angular offset can be greater than or less than about 120 degrees. The number of pairs of holes 506 can be about 2 pairs of holes 26 to about 12 pairs of holes 506, from about 3 pairs of holes 506 to about 9 pairs of holes 506, from about 4 pairs of holes 506 to about 8 pairs of holes 506, or some other grouping of pairs. The angular offset can range from about 30 degrees to about 180 degrees, from about 40 degrees to about 120 degrees, from about 45 degrees to about 90 degrees, or another angular offset. The diameter of the holes 2006 can be greater than or less than the 0.0007″. The elongate member 504 extending through the holes 506 can have a diameter of about 0.006″ or such other size to allow it to move within the hole 506 based upon the hole's diameter. The elongate member 504 can be formed of a metal, alloy, polymer, composite, combinations or modifications thereof. The material forming the elongate member 504 can be selected based upon a desired maximum or minimum elongate. For instance, if the elongate member 504 is formed of a shape-memory materials, such as NITINOL, the elongate member 504 can have an elongation of less than about 8%. It will be understood that the elongation can be less than or greater than 8% based upon the particular material chosen. For instance, the desired elongate can be from about 2% to about 10%, from about 4% to about 8%, or some other elongation.
The individual coil element 502 can be formed of stainless steel. In another configuration, the individual coil elements 502 can be formed of Polyetheretherketone (PEEK). Alternatively, the coil element 502 can be formed of a metal, alloy, composite, polymer, ceramic, combinations of modifications thereof.
As mentioned above, the holes 506 can receive the elongate members 504. The holes 506 can have walls 508 that are generally parallel, taper from one side to the other in a longitudinal axis or direction of the hole 506, form an hour-glass shape in cross-section taken parallel to the longitudinal axis, or some other cross-section. The configuration illustrated in
During deployment of an implantable medical device, such as the interventional device 10 described in relation to
While the bending port 234 of the described outer sheath 82 of
Turning to
In contrast to unsheathing the valve 10, when re-sheathing the valve, compressive forces are applied to the coil section 500. The coil section 500 still provides flexibility to movement and positioning of the valve cover 84. During re-sheathing, to avoid the offsetting of the coil elements 502 as described above and illustrated in
As illustrated in
With this configuration, a catheter can accommodate high tension during unsheathing and high compression during re-sheathing, while maintaining flexibility to move the catheter, including the valve cover 84 in 1, 2, or more planes.
During deployment of an implantable medical device, such as the interventional device 10 described in relation to
In one configuration, to enable collapsing of the valve, a funnel can be used to help the valve collapse more easily. Furthermore, the collapse of the valve is normally done below the AF temperature of NITINOL which can significantly reduce the force on the valve 10. Nevertheless, even when using a funnel under low temperatures, the sheathing forces can be around 25 lbs, 40 lbs, 50 lbs, 100 lbs, 150 lbs or more.
To control the collapse, and subsequent opening, of the ventricular anchor 14, loops 530 are formed between adjacent crests, as illustrated in
The loops 530 can be a guide for an elongate member 504, such as a NITINOL wire or a suture, that can draw the loops 530 towards a central axis 531 of the ventricular anchor 14 and to allow for symmetrical collapse of the ventricular anchor 14. For instance, as illustrated in
Alternatively, two elongate members 504a and 504b can be threaded through different groupings of the loops 530 as illustrated in
While reference is made to using two elongate members 504a and 504b, it will be understood that more than two elongate members 504a and 504b can used with an associated number of grouping of the loops 530. Additionally, while reference is made to the loops 530 extending between two crests, it will be understood that the loops 530 can be associated with a single crest or more than two crests.
In one configuration of the catheter described herein, a spacer or balloon can be used during sheathing the valve 10 into the valve cover 10 to avoid non-uniform folding of the valve 10. While the spacer or balloon can be removed following sheathing, the space formed by the spacer or balloon can be used to provide a channel for the elongate members 504 described herein. For instance, a compression resistant element 534 can be disposed at the center of the valve 10, as illustrated in
As illustrated in
To release the ventricular anchor 14, one end 532 of the elongate member 504 is released and the other end pulled towards the handle, such as one of the handles of the handle assembly 130, until the elongate member 504 has passed through all loops 530 and is withdrawn into or toward the center of the compression resistant tube 534, as illustrated in
In some circumstances, it is beneficial to retrieve the interventional device, such as the valve 10. This can be achieved while maintaining control of the valve 10 that is attached to the suture catheter 72 (
With the ventricular anchor 14, and the valve 10 as a whole, pulled into the left atrium 156 there is a relatively straight line from the suture catheter (72) extending through the vena cava 150 into the left atrium 156. This allows the valve 10 to be re-sheathed without articulation of a distal section of a retrieval catheter 600 (
Removal of the delivery catheter 78, the steering catheter 80, and the outer sheath 82 can be achieved following positioning at least the ventricular anchor 14 of the valve 10 in the left atrium 156 (
With the ventricular anchor 14, and the valve 10 as a whole, pulled into the left atrium 156 there is a relatively straight line from the suture catheter 72 extending through the vena cava 150 into the left atrium 156. The retrieval catheter 600 is advanced along the suture catheter 72 and into the left atrium 156 so that the valve 10 is captured within the retrieval catheter 72. Following re-sheathing or capture, the retrieval catheter 600, the valve 10, and the suture catheter 72 can be removed. This process, with the straight line from the suture catheter 72 extending through the vena cava 150 into the left atrium 156, allows the valve 10 to be re-sheathed without articulation of a distal section of the retrieval catheter 600, thereby reducing the forces need to collapse the valve 10 sufficiently to be received within the retrieval catheter 600 and eliminating higher force application if the suture catheter 600 is deflected in multiple planes.
While it is possible to advance the retrieval catheter 600 towards the distal end of the suture catheter 72, to overcome the collapse forces of about 25 pounds to about 150 pounds, about 40 pounds to about 100 pounds, or about 50 lbs to about 100, associated with re-sheathing or collapsing the valve 10 into the retrieval catheter 600, a threaded engagement can be used where rotational movement is converted into longitudinal movement of the retrieval catheter 600 along the suture catheter 72. To achieve this movement, the suture catheter 72 can include a threaded portion 602 that engages with a threaded portion 604 on a catheter 606. The threaded portion 602 provides an anchor point close to the end of the catheter.
Disposed at a distal end of the catheter 606 are protrusions 608 that can mate with complementary protrusions 610 formed in catheter 612 in a driving engagement where rotational movement of the catheter 612 is translated into longitudinal movement or displacement of the catheter 612 in relation to the catheter 606. More generally, an outside diameter or surface of the catheter 606 can mate with an inside diameter or surface of the catheter 612. When the catheter 612 is rotated, it moves forward relative to the catheter 606, while being fixed to the suture catheter 72. The catheter 612 can move forward or backward along the catheter 606 to advance an outer catheter 614; a distal end 614 of the catheter 612 being keyed to the outer catheter 616 so that the outer catheter 616 can be advanced but not rotated during rotation of the catheter 612.
The rotational or screwing mechanism from the protrusions 608 and 610 can be used to transmit high forces to collapse the valve 10 into a cavity formed at a distal end or cover of the outer catheter 616. Optionally, a distal end of the outer catheter 616 can include guiding feature to aid with retrieval of the valve 10. The guiding feature can include a tapered portion of the cover, rounded edges, or other structures to aid with retrieval of the valve 10.
One or more of the catheters 600, 606, 612 can be a hollow shaft, such as a hypotube, a helical strand shaft, or other structure having a lumen. The protrusions 608 and 610 can be formed by welding or joining one or more elements, such as coil elements to the catheters 606 and 612.
Following are some further example embodiments of the invention. These are presented only by way of example and are not intended to limit the scope of the invention in any way.
Embodiment 1. A delivery system for delivering an interventional device to a targeted anatomical site, the delivery system including an elongated delivery member having a proximal end and a distal end configured for housing the interventional device, and including a plurality of coaxially positioned delivery member components, the plurality of delivery member components including a delivery catheter having a bending portion having a coil section coaxially positioned with a braided portion, an inner catheter coaxially positioned within the delivery catheter and being adapted to maintain a connection with the interventional device until deployment of the interventional device, and a handle assembly for controlling movement of the delivery catheter and inner catheter.
Embodiment 2. The delivery system of embodiment 1, further including an interventional device formed from nitinol configured to be housed within an outer sheath of the elongated delivery member.
Embodiment 3. The delivery system of any of embodiments 1-2, wherein the coiled section comprises a plurality of coil elements with at least one elongate member extending through the plurality of coil elements.
Embodiment 4. The delivery system of any of embodiments 1-3, wherein each coil element comprises a plurality of holes organized in pairs circumferentially around the coil element.
Embodiment 5. The delivery system of any of embodiments 1-4, wherein each hole has walls that are parallel, tapered, or form an hour-glass shape in a cross-section.
Embodiment 6. The delivery system of any of embodiments 1-5, wherein the coil section is a stacked coil with substantially no space between adjacent coil elements.
Embodiment 7. The delivery system of any of embodiments 1-6, wherein a distal end of the braid section and a distal end of the coil section are fixed relative to a distal end of the delivery catheter.
Embodiment 8. The delivery system of any of embodiments 1-7, wherein a proximal end of the braid section is mounted to a first movable tubular member and a proximal end of the coil section is mount to a second movable tubular member, the first movable tubular member being movable independently from the second movable tubular member.
Embodiment 9. The delivery system of any of embodiments 1-8, wherein the braid section is selectively locked against an outer surface of the coil section.
Embodiment 10. The delivery system of any of embodiments 1-9, wherein the interventional device comprises at least two loops.
Embodiment 11. The delivery system of any of embodiments 1-10, further comprising an elongate member extending through the at least two loops, the elongate member selectively moveable to draw the at least two loops centrally to collapse at least a portion of the interventional device.
Embodiment 12. The delivery system of any of embodiments 1-11, wherein the elongate member extends through a center of the interventional device.
Embodiment 13. The delivery system of any of embodiments 1-12, wherein the elongate member extends through a compression resistant tube disposed within the interventional device.
Embodiment 14. A system for delivering an interventional device to a targeted anatomical site, the delivery system including an elongated delivery member having a proximal end and a distal end configured for housing the interventional device, and including a plurality of coaxially positioned delivery member components, the plurality of delivery member components including a delivery catheter having a bending portion, an inner catheter coaxially positioned within the delivery catheter and being adapted to maintain a connection with the interventional device until deployment of the interventional device, the inner catheter comprising a threaded portion at a location proximal a distal end of the inner catheter, and a handle assembly for controlling movement of the delivery catheter and inner catheter.
Embodiment 15. The system of embodiment 14, further comprising a retrieval catheter selectively mounted to the inner catheter when the delivery catheter is removed from coaxial positioning around the inner catheter.
Embodiment 16. The system of any of embodiments 14-15, wherein the retrieval catheter includes a first catheter comprising a threaded portion complementary to the threaded portion of the inner catheter and a second catheter disposed on the first catheter and being rotatable in relation to the first catheter.
Embodiment 17. The system of any of embodiments 14-16, wherein the first catheter and the second catheter are drivingly engaged so that rotational movement of the second catheter longitudinally displaces the second catheter in relation to the first catheter.
Embodiment 18. The system of any of embodiments 14-17, wherein a distal end of the second catheter has a keyed relationship with an outer catheter in that rotational movement of the second catheter is not translated to the outer catheter.
Embodiment 19. The system of any of embodiments 14-18, wherein the outer catheter comprising a cavity configured to receive the interventional device.
Embodiment 20. The system of any of embodiments 14-19, wherein the cavity is formed in a valve cover having guiding feature to aid with retrieval of the interventional device.
While certain embodiments of the present disclosure have been described in detail, with reference to specific configurations, parameters, components, elements, etcetera, the descriptions are illustrative and are not to be construed as limiting the scope of the claimed invention.
Furthermore, it should be understood that for any given element of component of a described embodiment, any of the possible alternatives listed for that element or component may generally be used individually or in combination with one another, unless implicitly or explicitly stated otherwise.
In addition, unless otherwise indicated, numbers expressing quantities, constituents, distances, or other measurements used in the specification and claims are to be understood as optionally being modified by the term “about” or its synonyms. When the terms “about,” “approximately,” “substantially,” or the like are used in conjunction with a stated amount, value, or condition, it may be taken to mean an amount, value or condition that deviates by less than 20%, less than 10%, less than 5%, or less than 1% of the stated amount, value, or condition. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Any headings and subheadings used herein are for organizational purposes only and are not meant to be used to limit the scope of the description or the claims.
It will also be noted that, as used in this specification and the appended claims, the singular forms “a,” “an” and “the” do not exclude plural referents unless the context clearly dictates otherwise. Thus, for example, an embodiment referencing a singular referent (e.g., “widget”) may also include two or more such referents.
It will also be appreciated that embodiments described herein may include properties, features (e.g., ingredients, components, members, elements, parts, and/or portions) described in other embodiments described herein. Accordingly, the various features of a given embodiment can be combined with and/or incorporated into other embodiments of the present disclosure. Thus, disclosure of certain features relative to a specific embodiment of the present disclosure should not be construed as limiting application or inclusion of said features to the specific embodiment. Rather, it will be appreciated that other embodiments can also include such features.
The pending application claims the benefit of and priority to U.S. Provisional Patent Application No. 62/975,629, filed Feb. 12, 2020, the disclosure of which is incorporated herein by this reference.
Number | Date | Country | |
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62975629 | Feb 2020 | US |