Patent Grant
8690910
1. The Field of the Invention
The present invention relates generally to apparatus and methods for engaging tissue and/or closing openings through tissue, and more particularly to devices for closing a puncture in a blood vessel or other body lumen formed during a diagnostic or therapeutic procedure, and to methods for making and using such devices.
2. The Relevant Technology
Catheterization and interventional procedures, such as angioplasty or stenting, generally are performed by inserting a hollow needle through a patient's skin and intervening tissue into the vascular system. A guide wire may then be passed through the needle lumen into the patient's blood vessel accessed by the needle. The needle may be removed, and an introducer sheath may be advanced over the guide wire into the vessel, e.g., in conjunction with or subsequent to a dilator. A catheter or other device may then be advanced through a lumen of the introducer sheath and over the guide wire into a position for performing a medical procedure. Thus, the introducer sheath may facilitate introduction of various devices into the vessel, while minimizing trauma to the vessel wall and/or minimizing blood loss during a procedure.
Upon completion of the procedure, the devices and introducer sheath may be removed, leaving a puncture site in the vessel wall. External pressure may be applied to the puncture site until clotting and wound sealing occur. This procedure, however, may be time consuming and expensive, requiring as much as an hour of a physician's or nurse's time. It is also uncomfortable for the patient, and requires that the patient remain immobilized in the operating room, catheter lab, or holding area. In addition, a risk of hematoma exists from bleeding before hemostasis occurs.
Various apparatus have been suggested for percutaneously sealing a vascular puncture by occluding the puncture site. For example, U.S. Pat. Nos. 5,192,302 and 5,222,974, issued to Kensey et al., describe the use of a biodegradable plug that may be delivered through an introducer sheath into a puncture site. When deployed, the plug may seal the vessel and provide hemostasis. Such devices, however, may be difficult to position properly with respect to the vessel, which may be particularly significant since it is generally undesirable to expose the plug material, e.g., collagen, within the bloodstream, where it may float downstream and risk causing an embolism.
Another technique has been suggested that involves percutaneously suturing the puncture site, such as that disclosed in U.S. Pat. No. 5,304,184, issued to Hathaway et al. Percutaneous suturing devices, however, may require significant skill by the user, and may be mechanically complex and expensive to manufacture.
U.S. Pat. No. 5,478,354, issued to Tovey et al., discloses a surgical fastener including an annular base having legs that, in a relaxed state, extend in a direction substantially perpendicular to a plane defined by the base and slightly inwards toward one another. During use, the fastener is fit around the outside of a cannula, thereby deflecting the legs outward. The cannula is placed in an incision, and the fastener is slid along the cannula until the legs pierce into skin tissue. When the cannula is withdrawn, the legs move towards one another back to the relaxed state to close the incision.
U.S. Pat. Nos. 5,007,921 and 5,026,390, issued to Brown, disclose staples that may be used to close a wound or incision. In one embodiment, an “S” shaped staple is disclosed that includes barbs that may be engaged into tissue on either side of the wound. In another embodiment, a ring-shaped staple is disclosed that includes barbs that project from the ring. Sides of the ring may be squeezed to separate the barbs further, and the barbs may be engaged into tissue on either side of a wound. The sides may then be released, causing the barbs to return closer together, and thereby pulling the tissue closed over the wound. These staples, however, have a large cross-sectional profile and therefore may not be easy to deliver through a percutaneous site to close an opening in a vessel wall.
Accordingly, devices for engaging tissue, e.g., to close a vascular puncture site, would be considered useful.
The present invention is directed to devices and methods for engaging tissue, e.g., to connect tissue segments together or to close and/or seal openings through tissue, such as in a wall of a body lumen. More particularly, the present invention is directed to vascular closure devices or clips for closing a puncture in a wall of a blood vessel formed during a diagnostic or therapeutic procedure, and to methods for making and using such devices.
In accordance with one aspect of the present invention, a device for closing an opening in a body lumen is provided that includes a generally annular-shaped body defining a plane, and a plurality of tissue engaging portions extending from the annular-shaped body substantially transversely with respect to the plane. In this embodiment, opposing tissue engaging portions, e.g., tines, are biased towards a substantially planar configuration lying in the plane. In one embodiment, the tissue engaging portions are biased towards one another, e.g., to close a puncture site or other opening through tissue. Alternatively, the tissue engaging portions may be biased away from one another.
In accordance with one aspect, the tissue engaging portions are integrally formed with the annular-shaped body, e.g., from a sheet of material, such as Nitinol or other superelastic alloy. The tissue engaging portions may be formed with the sheet of material in the substantially planar configuration. The tissue engaging portions may be deflected substantially transversely with respect to the plane to define a substantially transverse configuration. Alternatively, the device may be formed from an elongate wire or tube that may be wound to form an enclosed body.
In accordance with another aspect, the tissue engaging portions, e.g., tines, optionally including barbs, for penetrating tissue, may be disposed substantially symmetrically about a central axis. Alternatively, the tissue engaging portions may be disposed in opposing sets along a linear axis.
In accordance with another aspect of the present invention, a device for engaging tissue, e.g., to close an opening in a body lumen, is provided that includes a generally annular-shaped body defining a plane. A plurality of tissue engaging portions extend from the annular-shaped body substantially transversely with respect to the plane. In one embodiment, opposing tissue engaging portions of the device are biased towards a substantially planar configuration lying in the plane, as described above.
One or more expandable elements are disposed along a periphery of the annular-shaped body. The expandable elements are expandable between expanded, and compressed states for increasing and reducing a peripheral dimension of the annular-shaped body, respectively. In one embodiment, the expandable elements may be an enclosed cell, e.g. a diamond-shaped cell, having a first width in the expanded state and a second width in the compressed state that is smaller than the first width. Alternatively, the expandable elements may be a zig-zag element or an arcuate element. The expandable elements can be biased to the expanded state, e.g., by appropriate heat treating of the expandable elements. Alternatively, the expandable elements may be biased to the compressed state.
In accordance with yet another aspect of the present invention, a clip, such as those described above, may be loaded on a delivery apparatus and used to close and/or seal an opening in a wall of a body lumen. The apparatus generally includes a sheath including proximal and distal ends defining a longitudinal axis there between. A housing is slidably disposed on the sheath, the housing including an annular cavity therein. A clip, such as those described above, is disposed within the cavity with the tissue engaging portions disposed substantially distally.
The housing can be actuable for advancing the clip distally towards the distal end of the sheath, e.g., to deploy the clip from the cavity. For example, the apparatus may include an actuator coupled to the housing, the actuator configured for advancing the housing distally to deploy the clip. The actuator includes a spring mechanism for biasing the housing distally upon activation of the actuator. In addition, the apparatus may include a locator element for positioning the distal end of the sheath, such as a bleed back lumen or a mechanical locator.
During use, the distal end of the sheath, with the housing and clip near its proximal end, may be positioned through a patient's skin along a passage and into a body lumen via an opening in the wall of the body lumen. One or more instruments may be introduced through the lumen of the sheath into the body lumen. A diagnostic or therapeutic procedure may be performed using the instruments at a location accessed via the body lumen. For example, the body lumen is a peripheral blood vessel, such as a femoral artery, and the procedure may include angioplasty, atherectomy, stent delivery, delivery of a therapeutic agent, and/or tissue ablation.
The sheath may be manipulated, for example, with the aid of a locator element, to position the distal end with respect to the opening, e.g., to ensure that the clip engages a wall of the body lumen or other tissue proximal to the opening and is not advanced into the body lumen itself. The housing is advanced distally into the passage, e.g., until the tissue engaging portions of the clip substantially engage the wall of the body lumen or other tissue proximal to the opening in the wall of the body lumen. In addition, or alternatively, the clip may be deployed from the housing, for example, by an ejector within the housing. The sheath may then be withdrawn from the body lumen and passage, leaving the clip in the passage. As the distal end of the sheath is withdrawn through the clip, the tissue engaging portions automatically at least partially move towards the planar configuration to pull the engaged tissue together and substantially close the opening.
In one embodiment, the clip automatically expands to an enlarged cross-section when the clip is deployed from the housing. Thus, the clip may be compressed to facilitate loading into the housing, and thereby provide a reduced profile for the clip. This may be useful to allow the clip to be delivered through a smaller puncture.
A method according to the present invention may include causing a clip or other closure element to engage tissue, e.g., muscle, fat, fascia, and the like, that is proximal to the body lumen. Thus, unlike previously known methods, which are directed to closing the wall of a blood vessel using clips or sutures, the present invention may include deploying a closure element in the passage to cause it to engage intermediate tissue between the patient's skin and the wall of the body lumen. When performed in this manner, the need to precisely position a closure element may be avoided as is required when engaging the wall of a vessel. Instead, the closure element may be located and delivered at a range of locations along the length of the passage yet still close and/or seal the passage. In effect, extra-vascular tissue is engaged to close the passage and thereby cause sealing of the wound. When the closure element is deployed, it can be planar, e.g., extending substantially parallel to the surface of the patient's skin, although not necessarily so.
In one aspect of the present invention, a device for engaging tissue includes a generally annular-shaped body defining a plane and disposed about a central axis extending substantially normal to the plane. The body may be movable from a substantially planar configuration lying generally in the plane towards a transverse configuration extending out of the plane. The body may also include a plurality of looped elements including alternating first and second curved regions that define an inner and outer periphery of the body, respectively, in the planar configuration. A plurality of tines or other tissue-engaging elements may extend from the first curved regions, and may be oriented towards the central axis in the planar configuration, and substantially parallel to the central axis in the transverse configuration. The device may be biased towards the planar configuration, e.g., to bias the tines towards the central axis.
The looped elements of the device may generally define an endless zigzag pattern, e.g., a sinusoidal pattern, extending about the central axis. The looped elements may facilitating deforming the device between the planar and transverse configurations, e.g., by distributing stresses through the device and minimizing localized stresses in the curved regions. In addition, the looped elements may be expandable between expanded and compressed states for increasing and reducing a periphery of the body in the transverse orientation, respectively. The looped elements may be biased towards one of the compressed and expanded states.
Adjacent tines of the device may have a first curved region disposed between them. The first curved region between adjacent tines may include a substantially blunt element extending towards the central axis. The blunt element may have a length shorter than lengths of the adjacent tines.
In addition or alternatively, the tines of the device may include first and second primary tines, having a first length and a second length, respectively, which may be the same as or different than one another. The first and second primary tines may be disposed on opposing first curved regions, and may be oriented substantially towards each other in the planar configuration. In the planar configuration, the first and second primary tines may at least partially overlap. The tines may also include one or more secondary tines having a length substantially shorter than the first and second lengths of the primary tines. The secondary tines may be disposed on either side of the first and second primary tines.
In another aspect of the present invention, a device for engaging tissue includes a generally annular-shaped body defining a plane and disposed about a central axis extending substantially normal to the plane. The body may be movable from a substantially planar configuration lying generally in the plane towards a transverse configuration extending out of the plane. A first primary tine, having a first length, may extend from the body towards the central axis in the planar configuration, and may be deflectable out of the plane when the body is moved towards the transverse configuration. A second primary tine, having a second length, may extend from the body towards the first tine when the body is in the planar configuration, and may be deflectable out of the plane when the body is moved towards the transverse configuration. The lengths of the first and second primary tines may cause the primary tines to at least partially overlap in the planar configuration. The body may be biased towards the planar configuration to bias the tines generally towards the central axis.
The device may include a set of secondary tines having a length shorter than the first and second lengths. The secondary tines may extend from the body towards the central axis in the planar configuration, and may be deflectable out of the plane when the body is moved towards the transverse configuration. In an exemplary embodiment, a secondary tine may be disposed on either side of the first primary tine, and a secondary tine may be disposed on either side of the second primary tine.
Optionally, adjacent tines may have a first curved region disposed between them. The first curved region between adjacent tines may include a substantially blunt element extending towards the central axis. The blunt element may have a length shorter than lengths of the adjacent tines.
Also, the device may include a plurality of looped elements disposed around a periphery of the body. The looped elements may generally define an endless zigzag pattern extending about the central axis. The first primary tine and the second primary tine may extend from looped elements disposed opposite one another. The looped elements may be expandable between expanded and compressed states for increasing and reducing a periphery of the body in the transverse orientation, respectively. The looped elements may be biased towards one of the compressed and expanded states.
In another aspect of the present invention, a method is provided for manufacturing a clip from an elastic material, such as a sheet of superelastic alloy, e.g., a nickel-titanium alloy (“Nitinol”). The components of the clip, e.g., a generally-annular body, optionally including looped elements, and/or tines, may be formed by removing portions from the sheet. The portions may be removed, e.g., by laser cutting, chemical etching, photo chemical etching, stamping, electrical discharge machining, and the like. The clip may be polished using one or more processes, such as electro-polishing, chemical etching, tumbling, sandblasting, sanding, and the like, and/or heat-treated to provide a desired finish and/or desired mechanical properties. Optionally, the body and tines may be coated with a therapeutic agent, e.g., a peptide coating and/or one or more clotting factors.
In addition or alternatively, the clip may be disposed in a planar configuration, e.g., upon forming the clip from the sheet, and heat treated to form a clip biased to the planar configuration. For example, the clip may be formed from a shape memory material, e.g., Nitinol, which may substantially recover the planar configuration when heated to a first predetermined temperature corresponding to an austenitic state, e.g., a temperature close to body temperature. The clip may be cooled to a second predetermined temperature corresponding to a martensitic state, e.g., a temperature at or below ambient temperature, and malleably manipulated. For example, the clip formed from the sheet may be deformed to a transverse configuration, such as that described above, e.g., by loading the clip onto a mandrel or directly onto a delivery device. If the clip includes looped elements formed from the body, the looped elements may be biased upon heat treatment towards an expanded state, but may be malleably deformed to a compressed state upon cooling, e.g., to facilitate loading onto the delivery device. Alternatively, the clip may be formed from a superelastic material, e.g., Nitinol, such that the clip may be resiliently deformed to the transverse configuration and/or compressed state, yet may automatically attempt to resume its planar configuration and/or expanded state upon release from external forces.
In still another aspect of the present invention, a method for closing an opening in a wall of a body lumen is provided. The distal end of an elongate member may be advanced through an opening in a patient's skin, along a passage through tissue, and into the body lumen. A distal portion of an obturator may be positioned distally beyond the distal end of the elongate member along the passage within the body lumen. One or more expandable elements on the distal portion of the obturator may be expanded transversely. The obturator may be withdrawn from the passage until the expandable elements contact the wall of the body lumen, thereby providing a tactile indication of a location of the wall of the body lumen between the elongate member and the plurality of expandable elements of the obturator.
A clip may be advanced into the passage over the elongate member until tines of the clip penetrate the wall of the body lumen, the tines and the expandable elements on the obturator being angularly offset from one another such that the tines penetrate the wall at locations between the expandable elements. The obturator may be collapsed, and the elongate member and/or obturator may be withdrawn from the body lumen and passage, leaving the clip to substantially close the opening in the wall of the body lumen. When the elongate member is withdrawn, the tines may automatically at least partially move towards a planar configuration to substantially close the opening.
The tines of the clip may include primary tines and secondary tines. Here, advancing the clip may include puncturing the wall of the body lumen with the primary tines until tips of the primary tines enter the body lumen, and puncturing the wall of the body lumen with the secondary tines. The primary tines and the secondary tines may puncture the walls without contacting the expandable elements of the obturator.
The present invention is also directed to methods for manufacturing tissue engaging clips in a manner in which a clip-precursor is first formed and such precursor is then reconfigured into the final shape of the clip. In one embodiment of the invention, a clip having an annular or hoop-shaped generally planar configuration with radially inwardly extending tines is manufactured by first forming a precursor with the tines extending radially outward and then reconfigured by inserting the precursor to its final shape with the tines extending radially inward and then heat setting the clip in this configuration. This permits the tines to be packed more closely together which enhances the sealing function of the clip and reduces the size of the clip's footprint. As will be explained in more detail herein, this manufacturing method overcomes the limitations of conventional methods in which the clip is manufactured in its final configuration.
In another embodiment, an annular or hoop-shaped planar clip precursor with radially inwardly extending tines is first manufactured in an oversize configuration and then has its lateral dimensions reduced to pack the tines closer together and to reduce the footprint of the clip and then heat set in that configuration.
The present invention is directed to vascular closure devices or clips having a design particularly suitable for closing a puncture in a wall of a blood vessel formed during a diagnostic or therapeutic procedure. According to the present invention, a device for engaging tissue includes a generally annular-shaped body defining a plane and disposed about a central axis extending substantially normal to the plane. The body may be movable from a substantially planar configuration lying generally in the plane towards a transverse configuration extending out of the plane. The body also includes a plurality of looped elements including alternating first and second curved regions that define an inner and outer periphery of the body, respectively, in the planar configuration. A plurality of tines or other tissue-engaging elements extend from the first curved regions, and are oriented towards the central axis in the planar configuration, and substantially parallel to the central axis in the transverse configuration. The device may be biased towards the planar configuration, e.g., to bias the tines towards the central axis.
The looped elements of the device may generally define an endless zigzag pattern, e.g., a sinusoidal pattern, extending about the central axis. The looped elements may facilitating deforming the device between the planar and transverse configurations, e.g., by distributing stresses through the device and minimizing localized stresses in the curved regions. In addition, the looped elements may be expandable between expanded and compressed states for increasing and reducing a periphery of the body in the transverse orientation, respectively. The looped elements may be biased towards one of the compressed and expanded states.
Adjacent tines of the device may have a first curved region disposed between them. The first curved region between adjacent tines may include a substantially blunt element extending towards the central axis. The blunt element may have a length shorter than lengths of the adjacent tines.
The tines of the device may include first and second primary tines, having a first length and a second length, respectively, which may be the same as or different than one another. The first and second primary tines may be disposed on opposing first curved regions, and may be oriented substantially towards each other in the planar configuration. In the planar configuration, the first and second primary tines may at least partially overlap the body or each other. The tines may also include one or more secondary tines having a length substantially shorter than the first and second lengths of the primary tines. The secondary tines may be disposed on either side of the first and second primary tines.
A first primary tine, having a first length, may extend from the body towards the central axis in the planar configuration, and may be deflectable out of the plane when the body is moved towards the transverse configuration. A second primary tine, having a second length, may extend from the body towards the first tine when the body is in the planar configuration, and may be deflectable out of the plane when the body is moved towards the transverse configuration. The lengths of the first and second primary tines may cause the primary tines to at least partially overlap in the planar configuration. The body may be biased towards the planar configuration to bias the tines generally towards the central axis.
The device may include a set of secondary tines having a length shorter than the first and second lengths. The secondary tines may extend from the body towards the central axis in the planar configuration, and may be deflectable out of the plane when the body is moved towards the transverse configuration. In an exemplary embodiment, a secondary tine may be disposed on either side of the first primary tine, and a secondary tine may be disposed on either side of the second primary tine.
Optionally, adjacent tines may have a first curved region disposed between them. The first curved region between adjacent tines may include a substantially blunt element extending towards the central axis. The blunt element may have a length shorter than lengths of the adjacent tines.
Also, the device may include a plurality of looped elements disposed around a periphery of the body. The looped elements may generally define an endless zigzag pattern extending about the central axis. The first primary tine and the second primary tine may extend from looped elements disposed opposite one another. The looped elements may be expandable between expanded and compressed states for increasing and reducing a periphery of the body in the transverse orientation, respectively. The looped elements may be biased towards one of the compressed and expanded states.
In any event, the primary tines of the clips of the present invention will be offset from the axis of symmetry of the loop from which they extend. The offsetting of the primary tines is achieved by simply relocating the primary tines which are directly attached to the loop to a location which is not on the axis of symmetry of the loop or providing an intermediate connecting element between the tines and the axis of symmetry of the curved region of the loop from which the tine extends. This connecting element is straight or linear, but may also be curved. The connecting element can be connected to a point or region on the axis of symmetry of the loop to enhance consistency of performance of the clip during deployment. The offsetting of the tines is believed to reduce any tendency to wander during deployment, which the tines might otherwise have.
In another aspect of the present invention, a method is provided for manufacturing a clip from an elastic material, such as a sheet of superelastic alloy, e.g., a nickel-titanium alloy (“Nitinol”). The components of the clip, e.g., a generally-annular body, optionally including looped elements, and/or tines, may be formed by removing portions from the sheet. The portions may be removed, e.g., by laser cutting, chemical etching, photo chemical etching, stamping, electrical discharge machining, and the like, or by the method disclosed in one or more of the incorporated by reference patents or patent applications. The clip may be polished using one or more processes, such as electro-polishing, chemical etching, tumbling, sandblasting, sanding, and the a like, and/or heat-treated to provide a desired finish and/or desired mechanical properties. Optionally, the body and tines may be coated with a therapeutic agent, e.g., a peptide coating and/or one or more clotting factors.
In addition or alternatively, the clip may be disposed in a planar configuration, e.g., upon forming the clip from the sheet, and heat treated to form a clip biased to the planar configuration. For example, the clip may be formed from a shape memory material, e.g., Nitinol, which may substantially recover the planar configuration when heated to a first predetermined temperature corresponding to an austenitic state, e.g., a temperature close to body temperature. The clip may be cooled to a second predetermined temperature corresponding to a martensitic state, e.g., a temperature at or below ambient temperature, and malleably manipulated.
For example, the clip formed from the sheet may be deformed to a transverse configuration, such as that described above, e.g., by loading the clip onto a mandrel or directly onto a delivery device. If the clip includes looped elements formed from the body, the looped elements may be biased upon heat treatment towards an expanded state, but may be malleably deformed to a compressed state upon cooling, e.g., to facilitate loading onto the delivery device. Alternatively, the clip may be formed from a superelastic material, e.g., Nitinol, such that the clip may be resiliently deformed to the transverse configuration and/or compressed state, yet may automatically attempt to resume its planar configuration and/or expanded state upon release from external forces.
In still another aspect of the present invention, a method for closing an opening in a wall of a body lumen is provided. The distal end of an elongate member may be advanced through an opening in a patient's skin, along a passage through tissue, and into the body lumen. A distal portion of an obturator may be positioned distally beyond the distal end of the elongate member along the passage within the body lumen. One or more expandable elements on the distal portion of the obturator may be expanded transversely. The obturator may be withdrawn from the passage until the expandable elements contact the wall of the body lumen, thereby providing a tactile indication of a location of the wall of the body lumen between the elongate member and the plurality of expandable elements of the obturator.
A clip may be advanced into the passage over the elongate member until tines of the clip penetrate the wall of the body lumen, the tines and the expandable elements on the obturator being angularly offset from one another such that the tines penetrate the wall at locations between the expandable elements. The obturator may be collapsed, and the elongate member and/or obturator may be withdrawn from the body lumen and passage, leaving the clip to substantially close the opening in the wall of the body lumen. When the elongate member is withdrawn, the tines may automatically at least partially move towards a planar configuration to substantially close the opening. The clip may also be delivered to the desired site by using the apparatus and methods disclosed in U.S. patent application Ser. No. 10/356,214, filed Jan. 30, 2003 and Ser. No. 10/638,115, filed Aug. 8, 2003. The clip may also be manufactured according to the method set forth in U.S. patent application Ser. No. 10/335,075, filed Dec. 31, 2002.
Advancing the clip may include puncturing the wall of the body lumen with the primary tines until tips of the primary tines enter the body lumen, and puncturing the wall of the body lumen with the secondary tines. The primary tines and the secondary tines may puncture the walls without contacting the expandable elements of the obturator.
The present invention also relates to a method for closing an opening in a wall of a body lumen. The method can include advancing a distal end of an elongate member within the body lumen, the elongate member having a distal portion that assists in presenting the wall for receiving a clip having a plurality of tissue engaging portions having tips that point generally toward a central axis of the clip. Further, the method can include advancing the clip relative to the elongate member and the wall of the body lumen until the plurality of tissue engaging portions penetrate the wall of the body lumen. Optionally, the clip can be advanced until a distal end of the plurality of tissue engagement portions penetrate the wall but do not enter the body lumen. Stated another way, the method can include stopping advancement of the clip before the distal end of the plurality of tissue engagement portions enter the body lumen. Once the clip penetrates the wall, the elongate member can be withdrawn from the body lumen, leaving the clip to substantially close the opening in the wall of the body lumen.
According to another aspect, the method can include advancing a second elongate member relative to the elongate member, the clip slidably cooperating with the second elongate member. Withdrawing the second elongate member relative to the elongate member following penetration of the plurality of tissue engaging portions into the wall of the body lumen can enable the plurality of tissue engaging portions to automatically at least partially move towards a planar configuration to substantially close the opening.
The method can also related to closing a opening in a wall of a body lumen by (i) advancing a distal end of a first elongate member within the body lumen, the elongate member having a distal portion that assists in presenting the wall for receiving a clip having a plurality of tissue engaging portions symmetrically disposed about the clip, (ii) advancing the clip relative to the elongate member and the wall of the body lumen, as the distal portion of the elongate member assists with presenting the wall for receiving the clip, until the plurality of tissue engaging portions penetrate the wall of the body lumen, the tissue engaging portions and the distal portion of the elongate member being angularly offset from one another; and (iii) withdrawing the elongate member from the body lumen, leaving the clip to substantially close the opening in the wall of the body lumen.
To aid with positioning the clip relative to the wall, the method can further include positioning the distal portion of the first elongate member relative to the wall to assist in presenting the wall for receiving the clip to close the opening. In addition, the method can include moving the clip within a carrier assembly that moves relative to a second elongate member, toward the distal portion of the first elongate member until the clip deploys from within the carrier assembly.
Still another method of closing an opening in a wall of a body lumen can include advancing a distal end of a first elongate member within the body lumen, the elongate member having a distal portion that assists in presenting the wall for receiving a clip having a plurality of tissue engaging portions symmetrically disposed about the clip. The method can further include positioning a distal end of a second elongate member relative to the first elongate member, the second elongate member having a carrier assembly that receives the clip, and advancing the clip relative to the wall of the body lumen, as the distal portion of the first elongate member assists with presenting the wall for receiving the clip, until the plurality of tissue engaging portions penetrate the wall of the body lumen. Once the clip penetrates the wall, the method can include withdrawing the first elongate member and the second elongate member from the body lumen, leaving the clip to substantially close the opening in the wall of the body lumen.
These and other objects and features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by the practice of the invention as set forth hereinafter.
To further clarify the above and other advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered 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:
The present invention is directed to devices and methods for engaging tissue, e.g., to connect tissue segments together or to close and/or seal openings through tissue, such as in a wall of a body lumen. More particularly, the present invention is directed to vascular closure devices or clips for closing a puncture in a wall of a blood vessel formed during a diagnostic or therapeutic procedure, and to methods for making and using such devices.
Turning now to the drawings,
In another embodiment, the body 12 and tissue engaging portions 14 are integrally formed from a single sheet of material, such as a superelastic alloy, such as a nickel-titanium (“Nitinol”) alloy. Portions of the sheet may be removed using conventional methods, such as laser cutting, chemical etching, and the like, to form the clip 10.
As shown in
The tissue engaging portions 14 can be biased from the transverse configuration towards one another, i.e., towards the planar configuration of
In addition, the expandable cells 20 may be expandable from a compressed state, shown in
In an alternative embodiment, the clip 10 may be formed from a shape memory alloy, e.g., Nitinol, with the expandable cells in the compressed state. With the clip 10 in the transverse configuration, the clip 10 may be expanded, e.g., by applying a force radially outwards against an inner surface of the clip 10, thereby expanding the expandable cells 20 to the expanded state and expanding the clip 10 to the second diameter 26b. The expandable cells 20 may then be heat treated to cause the expandable cells 20 to “remember” the expanded state, as is known to those skilled in the art. It may also be necessary to subsequently heat treat the clip 10 further, e.g. with the tissue engaging portions 14 in the planar configuration to cause the tissue engaging portions 14 to “remember” and be biased to the planar configuration, as is known to those skilled in the art.
Turning to
The tissue engaging portions 114 may be deflected such that they extend substantially transversely from the body 112 (not shown). The tissue engaging portions 114 may be oriented substantially parallel to the axis 124 to define a transverse configuration such that the body 112 has a generally annular shape. The tissue engaging portions 114 can be biased from the transverse configuration towards one another, i.e., towards the planar configuration of
The expandable cells 120 have a generally arcuate shape that may be expandable from a first width to a second wider width (not shown), behaving similarly to the diamond-shaped cells of the previous embodiment. Thus, the expandable cells 120 may be biased to the expanded state, but may be compressed to the compressed state, as described above.
Turning to
The expandable cells 220 are substantially enclosed loops that may at least partially open from a compressed state (shown in
Turning to
Turning to
Alternatively, as shown in
In this embodiment, the tissue engaging regions 414 are disposed in opposing sets along an axis of symmetry 424 extending between looped regions 426, defining a substantially planar configuration. The tissue engaging portions 414 may be directed substantially transversely with respect to a plane defined by the planar configuration, but can be biased to return towards the planar configuration, similar to the embodiments described above.
In an alternative embodiment, shown in
Turning to
Optionally, the sheath 52 may include a side port 66 that communicates with the lumen 60, for example, to allow the infusion of fluids into the lumen 60, through the sheath 52. Alternatively, or in addition, the side port 66 may be used to provide a “bleed back” indicator, such as that disclosed in U.S. Pat. No. 6,626,918, entitled “Apparatus and Methods for Positioning a Vascular Sheath,” which is assigned to the assignee of the present invention, and the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference. Alternatively, the apparatus 50 may include a mechanical locator (not shown), such as that disclosed in U.S. Pat. No. 6,780,197, filed on the same day with U.S. Pat. No. 6,719,777, entitled “Apparatus and Method for Delivering a Closure Device,” the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
The housing 54 is slidably disposed on an exterior of the sheath 52, the housing 54 configured for releasably holding the clip 10, e.g., within an annular cavity therein (not shown). The housing may be substantially permanently attached to the sheath 52 or, alternatively, the housing 54 may be attachable to the sheath 52, e.g., using an outer sleeve (not shown). This outer sleeve may have the housing thereon, and the sleeve may be advanced over the sheath 52, and coupled thereto at any time during its use. Exemplary embodiments of a housing for use with an apparatus in accordance with the present invention are disclosed in U.S. Pat. Nos. 6,197,042, 6,461,364, and 6,391,048, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
The housing 54 is actuable from the proximal end 62 of the sheath 52, for example, by a housing actuator assembly (not shown), for advancing the clip 10 distally during deployment. A rod, cable, or other control wire (not shown) may couple the housing 54 to the actuator assembly. The housing actuator assembly may be detachable from the sheath 52, e.g., to facilitate introduction of devices into the lumen 60. In one embodiment, the actuator may be biased to advance the housing 54 upon activation. Thus, when activated, the housing 54 may be advanced towards the distal end of the sheath 52 to deploy the clip 10.
Turning to
Generally, the clip 10 is pre-loaded in the housing 54 before the procedure. The clip 10 may be constrained in its substantially transverse configuration and then introduced over the distal end 64 of the sheath 52 and into the cavity or otherwise loaded in the housing 54. Because the tissue engaging portions (not shown) of the clip 10 are biased to a planar configuration, they may engage an inner wall (not shown) of the housing 54 or an outer surface of the sheath 52, thereby constraining the clip 10 in its transverse configuration. Alternatively, the clip 10 may be directed over the distal end 64 of the sheath 62, thereby causing the tissue engaging portions to deflect transversely from the planar configuration towards a substantially axial or distal configuration.
As shown in
The sheath 52 may be advanced over a guidewire or other rail (not shown) previously positioned through the passage 92 into the blood vessel 90 using a conventional procedure. The blood vessel 90 can be a peripheral vessel, such as a femoral, radial, or carotid artery, although other body lumens may be accessed using the sheath 52, as will be appreciated by those skilled in the art.
The passage 92, and consequently the sheath 52, may be oriented at a substantially acute angle “alpha” with respect to the vessel 90, thereby facilitating introduction of devices through the lumen 60 of the sheath 52 into the vessel 90 with minimal risk of damage to the vessel 90. One or more devices, such as a guide wire, a catheter, and the like (not shown), may be inserted through the sheath 52 and advanced to a desired location within the patient's body. For example, the devices may be used to perform a therapeutic or diagnostic procedure, such as angioplasty, atherectomy, stent implantation, and the like, within the patient's vasculature.
After the procedure is complete, the device(s) may be removed from the sheath 52. The sheath 52 may be manipulated to position the distal end 64 with respect to the opening 92, e.g., to ensure that the housing 54 is advanced to properly deploy the clip 10 in the wall 98 of the vessel 90. Bleed back or mechanical locators may be used to facilitate this positioning.
As shown in
In addition, as the clip 10 is deployed from the housing 54, the clip 10 may expand radially to an enlarged diameter (not shown), for example, if the clip 10 includes expandable elements (not shown), such as those described above. Thus, the clip 10 may be compressed into the housing 54, e.g., thereby allowing a smaller profile housing 54 to be used. The clip 10 may be expanded upon deployment to engage a larger area of tissue adjacent the opening in the wall 98 of the vessel 90.
As shown in
Turning to
Turning to
As shown in
In a further alternative, shown in
Turning to
In another embodiment, the body 512 and tissue engaging portions 514 are integrally formed from a single sheet of material, such as a Nitinol, similar to the embodiments described above. The clip 510 is shown in a relaxed state with the tissue engaging portions 514 disposed radially outward in a substantially planar configuration. Similar to the previous embodiments, the tissue engaging portions 514 may be deflected such that they extend from the body 512 substantially transversely with respect the plane defined by the sheet (similar to
The tissue engaging portions 514 can be biased from the transverse configuration away from one another, i.e., towards the planar configuration. Thus, with the tissue engaging portions 514 in the transverse configuration, the tines 518 may be engaged with tissue. When the clip 510 is released, e.g., from within a delivery device, the tissue engage portions 514 may attempt to return to the planar configuration, thereby securing the tissue with respect to the clip 510.
In addition, the clip 510 may include expandable cells 520 that are expandable from a compressed state to an expanded state (similar to
Turning to
The tissue engaging portions 614 may be directed substantially transversely with respect to a plane defined by the planar configuration, for example, by loading the clip 614 into a housing or lumen of a delivery device (not shown). The tissue engaging portions 614 can be biased to move away from one another, i.e., towards the planar configuration. In an alternative embodiment, the looped regions 626 or other regions of the body 612 may include expandable elements (not shown), e.g., having a zig-zag shape, a diamond shape, and the like.
Turning to
The clip 710 may be constrained on a delivery apparatus (not shown), similar to that described above, such that the tissue engaging portions 714 are all directed substantially transversely, and optionally distally, to facilitate their engagement into tissue during deployment, as will be appreciated by those skilled in the art. Unlike previous embodiments, which may close tissue around an opening, this embodiment may be useful when it is desired to maintain the relative position of tissue being engaged by the clip 710.
Turning now to the drawings,
The body 812 may include a plurality of looped or curved elements 828 that are connected to one another to form the body 812. Each looped element 828 may include an inner or first curved region 832 and an outer or second curved region 34. In another embodiment, the first and second curved regions 832, 834 are out of phase with one another and are connected alternately to one another, thereby defining an endless sinusoidal pattern. Alternatively, other generally zigzag patterns may be provided that repeat periodically, e.g., saw tooth or square tooth patterns (not shown), instead of a sinusoidal pattern, thereby defining inner and outer regions that alternate about the body 812. When the clip 810 is in a substantially planar configuration, as shown in
The plurality of tines 818 may be biased to extend generally inwardly, e.g., towards one another and/or towards the central axis 824. The tines 818 may be disposed on the first curved regions 832, and oriented toward the central axis 824 when the clip 810 is in the planar configuration. In another embodiment, the tines 818 may be provided in pairs opposite from one another or provided otherwise symmetrically with respect to the central axis 824.
The tines 818 may include a variety of pointed tips, such as a bayonet tip, and/or may include barbs (not shown) for penetrating or otherwise engaging tissue. For example, to increase the penetration ability of the clip 810 and/or to lower the insertion force required to penetrate tissue, each tine 818 may include a tapered edge (not shown) extending towards the tip along one side of the tine 818. Alternatively, each tine 818 may be provided with a tapered edge on each side of the tine 818 extending towards the tip.
Additionally, as shown in
As shown in
In another embodiment, the tines 818 and/or body 812 are biased to move from the transverse configuration towards the planar configuration of
The looped elements 828 may distribute stresses in the clip 810 as it is deformed between the planar and transverse configurations, thereby minimizing localized stresses that may otherwise plastically deform, break, or otherwise damage the clip 810 during delivery. In addition, when the clip 810 is in the transverse configuration, the looped elements 828 may be movable between a compressed state, such as that shown in
With the clip 810 in the transverse configuration, the looped elements 828 may be circumferentially and/or radially compressed to the compressed state until the clip 810 defines a first diameter or circumference 826a, such as that shown in
To manufacture the clip 810 (or, similarly, any of the other clips described herein), the body 812 and the tines 818 may be integrally formed from a single sheet of material, e.g., a superelastic alloy, such as a nickel-titanium alloy (“Nitinol”). Portions of the sheet may be removed using conventional methods, such as laser cutting, chemical etching, photo chemical etching, stamping, using an electrical discharge machine (EDM), and the like, to form the clip. The tines 818 may be sharpened to a point, i.e., tips may be formed on the tines 818 using conventional methods, such as chemical etching, mechanical grinding, and the like.
The clip 810 may be polished to a desired finish using conventional methods, such as electro-polishing, chemical etching, tumbling, sandblasting, sanding, and the like. Polishing may perform various functions depending on the method used to form the clip 810. For a clip formed by laser cutting or using an EDM, polishing may remove heat affected zones (HAZ) and/or burrs from the clip. For a clip formed by photo chemical etching, polishing may create a smoother surface finish. For a clip formed by stamping, polishing may remove or reduce burrs from the bottom side of the clip, and/or may smooth the “roll” that may result on the topside of the clip from the stamping process.
In addition or alternatively, the clip 810 may be formed from a shape memory alloy, e.g., Nitinol, with the looped elements 828 formed initially in the compressed state and/or the clip 810 in the planar configuration. With the clip 810 deformed to the transverse configuration, the clip 810 may be expanded, e.g., by applying a force radially outwards against an inner surface of the clip 810, thereby expanding the looped elements 30 to the expanded state. The looped elements 828 may then be heat treated, e.g., by heating the clip 10 to an austenitic state, to cause the looped elements 828 to “remember” the expanded state, as is known to those skilled in the art. It may also be necessary to further heat treat the clip 810 further, e.g., with the tines in the planar configuration to cause the body 812 and/or tines 818 to “remember” and be biased towards the planar configuration, as is known to those skilled in the art. The clip 810 may then be cooled, e.g., to a martensitic state, which may be at or close to ambient temperature, and manipulated, e.g., malleably deformed to the transverse configuration, for example, by loading the clip 810 onto a delivery device (not shown), as described below. Thus, if the clip 810 is subsequently heated to a predetermined temperature, e.g., at or below body temperature, the material may remember the planar configuration and/or expanded state and become biased towards them.
Unlike the previous embodiment, the clip 910 includes a plurality of primary tines 916 and a plurality of secondary tines 918. Each of the primary and secondary tines 916, 918 may include a variety of known pointed tips, similar to the previous embodiment.
Each of the primary tines 914 may have a length l1, although alternatively each of the primary tines 914 may have a different length than one another. The primary tines 914 may be disposed in one or more opposing pairs, e.g., on opposing first curved regions 932, and may be oriented towards and/or across the central axis 924 in the planar configuration. In the planar configuration, the lengths l1 may be sufficiently long such that the primary tines 914 at least partially overlap one another, i.e., extend across the central axis 924 towards an opposing tine 914. Therefore, the tips of the primary tines 914 may extend past the central axis 924 and/or the primary tines 914 in each pair may lie substantially parallel to each other when the clip 910 is in the planar configuration.
Each of the secondary tines 916 may be disposed on a first or inner curved region 932, e.g., such that one or more secondary tines 916 may be provided between opposing pairs of primary tines 914. Each of the secondary tines 916 may have a length 1.sub.2 that is substantially less than the length l1 of the primary tines 914.
A secondary tine 916 can be is disposed on either side of each primary tine 914. For example, the clip 910 shown in
As shown in
The tines 914, 916 may be biased towards one another and/or towards the central axis 924, i.e., due to the bias of the clip 910 towards the planar configuration of
The looped elements 928 may be expandable between a compressed state, as shown in
Turning to
Any of the clips of the present invention may include one or more radiopaque markers or other markers visible using external imaging, such as fluoroscopy. For example, using the clip 910 of
Alternatively, the clip 910 may be partially coated with radiopaque material by using masking techniques. For example, the entire clip 910 may first be coated with radiopaque material. The clip 910 may then be masked at locations where the radiopaque coating is desired. For example, the looped elements 928 of the clip 910 may be left unmasked during this process if it is desired to leave the looped elements 928 uncoated by radiopaque material. This may be desirable, e.g., to prevent radiopaque material from adversely affecting the flexibility of the looped elements 928. The clip 910 may then be treated to remove the radiopaque material from the unmasked areas, in this example, the looped elements 928. The masking may then be removed using conventional processes, leaving the rest of the clip 910 coated with radiopaque material.
Turning to
Turning to
The clip 1110 also includes stop members 1106 on one or more of the tines 1114, 1116, e.g., adjacent the respective first curved region 1132. Each stop member 1106 may be blunt-shaped, e.g., generally triangularly with an apex 1107 of the stop member 1106 extending from the first curved region 1132, and the tine 1114, 1116 extending from a wide or blunt base 1107 of the stop member 1106. During use, the blunt bases 1107 may limit penetration of the respective tines 1114, 1116 into tissue by reducing an effective length of the respective tine 1114, 1116. For example, when the tines 1114, 1116 are driven into tissue, the tines 1114, 1116 may penetrate the tissue until the blunt bases 1107 contact the tissue, whereupon the tines 1114, 1116 may be prevented from penetrating further into the tissue.
Turning to
In the embodiment shown, the spring elements 1240(i) generally are hollow diamond shaped elements, including curved inner regions 1232(i) oriented towards the central axis 1224 of the body 1212 when the clip 1210(i) is in the planar configuration. The spring elements 1240(i) may serve multiple purposes. First, the spring elements 1240(i) may bias the clip 1210(i), e.g., allowing the clip 410(i) to at least partially expand resiliently. For example, when the clip 1210(i) is deflected into the transverse configuration (not shown), the spring elements 1240(i) may allow the tines 1214 to be moved away from the central axis 1224 and/or one another. Thus, during deployment, the tines 1214 may be deflected radially outwardly or otherwise expanded to engage a larger area of tissue.
As the tines 414 are expanded, the spring elements 1214(i) may deform to become wider (along a dimension extending generally between the adjacent tines 1214) and shorter (along a dimension extending generally parallel to the tines 1214). Once a force causing the tines 1214 to expand is removed, the spring elements 1214(i) may resiliently try to return towards their original shape, thereby pulling the tines 1214 closer towards one another.
In addition, the curved inner regions 1232(i) of the spring elements 1214(i) may provide stops limiting penetration of the tines 1214 into tissue, similar to the stop members described above. For example, when the clip 1210(i) is in the transverse configuration and the spring elements 1214(i) are expanded, the curved inner regions 1232(i) may be become more oblique, possibly becoming generally linear. Thus, when the tines 1214 are driven into tissue, the curved inner regions 1232(i) may limit penetration of the tines 1214.
Finally, after the clip 1210(i) is deployed, e.g., the tines 1214 are penetrated into tissue, the curved inner regions 1232(i) may return towards their original shape, and may pinch or otherwise engage tissue between the inner curved regions 1232(i) and the adjacent tines 1214. Thus, contracting the spring elements 1240(i) may enhance the ability of the clip 1210(i) to seal a puncture site, e.g., by pulling engaged tissue inwardly towards the central axis 1224 of the clip 1210(i).
Turning to
Turning now to
The tines 1516 are curved or arcuately shaped and include distal tips 1515 that extend toward the central axis 1524 when the clip 1510 is in the substantially planar configuration. Optionally, one or more of the tines 1516 may include barbs 1517, similar to the previous embodiments. The curve of the tines 1516 can all be in phase with one another such that the tines 1516 spiral about the central axis 1524. This may allow a length of the tines 1516 to be maximized for a given diameter of the body 1512.
For example, the tines 1516 may have a length that is greater than a radius of the body 1512 without the distal tips 1515 of the tines 1516 touching one another. Thus, due to the arcuate shape of each tine 1516, the tines 1516 of clip 1510 may be generally longer than the straight tines of the previous clips having comparable diameters. The tines 1516 may, therefore, penetrate deeper into tissue than the tines of the other clips.
As with the previous embodiments, the body 1512 and/or the tines 1516 of clip 1510 may be deflected until the tines 1516 extend transversely with respect to the plane defined in the planar configuration, thereby defining a transverse configuration. In the transverse configuration, the tines 1516 may be oriented substantially parallel to the central axis 1524. Additionally, as with the previous embodiments, the tines 1516 and/or body 1512 may be biased to move from the transverse configuration towards the planar configuration. The clip 1510 may be delivered in substantially the same manner as will be described with respect to other clips of the present invention.
Any of the clips of the present invention may be coated with a substance that enhances hemostasis and/or healing of a blood vessel, e.g., by increasing a rate of regeneration of endothelium on the interior surface of the vessel, or by decreasing inflammatory response at the treatment site. In one embodiment, a suitable synthetic peptide coating may be applied to a clip to attract endothelial cells to the surface. An exemplary synthetic peptide coating may, for example, attach to the same cell binding sites as collagen. In another embodiment, a clip may be coated with a combination of clotting factors in order to promote hemostasis. For example, one side of the clip may be coated with Factor III and an endopeptidase, such as PTA, to accelerate the intrinsic clotting pathway. On the opposite side of the clip, a combination of a protein cofactor proaccelerin (Factor V) and an activated endopeptidase, such as serum prothrombin conversion accelerator (SPCA), cothromboplastin, and the like, may be applied to accelerate the extrinsic clotting pathway. The clips of the present invention may also be coated with any suitable hydrophilic polymer that swells in the presence of bodily fluids in order to reduce, minimize, or stop blood flow, thereby aiding the hemostasis process.
The clips of the present invention may be delivered using various apparatus and methods. An exemplary apparatus 1300 suitable for delivering a clip of the present invention is shown in
Generally, the apparatus 1300 includes an introducer sheath 1352, and a housing or carrier assembly 1354 slidably disposed on the sheath 1352. The sheath 1352 includes a substantially flexible or semi-rigid tubular body 1358 including a lumen 1360 extending between its proximal and distal ends 1362, 1364. The distal end 1364 has a size and shape configured to facilitate insertion into a blood vessel, e.g., having a tapered tip for facilitating substantially atraumatic introduction through the passage and at least partially into the vessel. The lumen 1360 has a size for inserting one or more devices therethrough, such as a catheter, guidewire, and the like (not shown). The sheath 1352 also can include one or more seals (not shown), such as a hemostatic valve, within the lumen 1360 at or near the proximal end 1362 that provides a fluid-tight seal, yet accommodates inserting one or more devices into the lumen 1360 without fluid passing proximally from the sheath 1352.
Optionally, the sheath 1352 may include a side port 1366 that communicates with the lumen 1360, for example, to deliver fluids into the lumen 1360. Alternatively, or in addition, the side port 1366 may be used to provide a “bleed back” indicator. An exemplary “bleed back” indicator and related methods of use are disclosed in U.S. Pat. No. 6,626,918, which is assigned to the assignee of the present application, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
The apparatus 1300 may also include a mechanical locator or obturator 1400, such as that disclosed in U.S. application Ser. No. 10/081,723, now U.S. Pat. No. 6,942,674, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference, that may be part of an actuator assembly that is attachable to the proximal end of the sheath 1352. Alternatively, the mechanical locator or obturator 1400 may be a separate device that is insertable into the lumen 1360, e.g., through the actuator assembly. Generally, the obturator 1400 is an elongate member including a distal tip 1414 and a distal portion 1416. The distal tip 1414 may be substantially soft and/or flexible such that the distal tip 1414 may substantially atraumatically enter the vessel 1390 (not shown, see
The carrier assembly 1354 is slidably disposed on an exterior of the sheath 1352, and is configured for releasably carrying a clip 910 (shown in phantom), which may any of the clips described herein. The carrier assembly 1354 may be substantially permanently attached to the sheath 1352 and/or may be actuated from the proximal end 1362 of the sheath 1352, for example, by the actuator assembly (not shown), to advance the clip 910 distally during deployment. Alternatively, the clip 910 may be carried by an actuator assembly, as disclosed in co-pending U.S. application Ser. No. 10/081,725, now U.S. Pat. No. 6,749,621, filed on the same day as the present application and entitled “Sheath Apparatus and Methods for Delivering a Closure Device,” which is assigned to the assignee of the present application, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
Turning to
As shown in
The passage 1392, and consequently the sheath 1352, may be oriented at an angle “alpha” with respect to the vessel 1390, thereby facilitating introducing devices through the lumen 1360 of the sheath 1352 into the vessel 1390 with minimal risk of damage to the vessel 1390. One or more devices, such as a guide wire, a catheter, and the like (not shown), may be inserted through the sheath 1352 and advanced to a desired location within the patient's body. For example, the devices may be used to perform a therapeutic or diagnostic procedure, such as angioplasty, atherectomy, stent implantation, and the like, within the patient's vasculature.
After the procedure is complete, any devices used during the procedure may be removed from the sheath 1352, and the obturator 1400 may be inserted into the lumen 1360. For example, the obturator 1400 may be part of an actuator assembly (not shown), and may be advanced through the lumen when the actuator assembly is attached to the proximal end of the sheath 1352. Alternatively, the actuator assembly and obturator 1400 may be coupled separately to the sheath 1352.
When the obturator 1400 is fully inserted within the sheath 1352, the distal portion 1416 of the obturator 1400 may extend beyond the distal end 1364 of the sheath 1352. In an alternative embodiment, the obturator 1400 may be attached to an exterior surface (not shown) of the sheath 1352, for example, along a track, e.g., including cooperating slots, grooves, and the like (not shown) in the sheath 1352 and obturator 1400.
Turning to
As shown in
Generally, the clip 910 is carried by the carrier assembly 1354 before the procedure. The clip 910 may be constrained in its transverse configuration on the carrier assembly 1354, and the carrier assembly 1354 may be provided on or adjacent the proximal end of the sheath 1352. Because the tines, which may include primary and secondary tines 914, 916 may be biased towards one another, the tines 914, 916 may slidably contact an inner surface (not shown) of the carrier assembly 1354 or an outer surface of the sheath 1352, thereby constraining the clip 910 in its transverse configuration.
Turning to
As the clip 910 is deployed from the carrier assembly 1354, the clip 910 may be expanded to an enlarged diameter. For example, a distal end of the carrier assembly 1354 may include a ramped region (not shown) that may deflect the tines 914, 916, and/or the body of the clip 910 radially outwardly. As the clip 910 is advanced over the ramped region, the tines 914, 916 may be deflected radially outwardly as they are being driven into the surrounding tissue, thereby engaging a larger region of tissue than if the tines 914, 916 had been maintained substantially axially.
Alternatively, the clip 910 may include expandable looped elements and/or spring elements (not shown), such as those described above, that may facilitate expanding the clip 910 as it is deployed from the carrier assembly 1354 and/or the sheath 1352. For example, the looped elements of the clip 910 may be compressed when the clip 910 is loaded into the carrier assembly 1354, e.g., thereby allowing a relatively smaller profile carrier assembly 1354 to be used. The clip 910 may automatically expand upon deployment from the carrier assembly 1354 to engage a larger region of tissue surrounding the opening, such as an arteriotomy 1391 in the wall 1398 of the vessel 1390 (see
Once the clip 910 is deployed entirely or otherwise released from the sheath 1352, the clip 910 may resiliently move towards its substantially planar configuration, such as that shown in
During delivery of the clip 910, radiopaque markers (not shown) on the clip 910, the carrier assembly 1354, and/or the expandable members 1418 may be monitored, e.g., using fluoroscopy, to facilitate observing and/or positioning the apparatus 1300. Thus, a relative position of the clip 910 with respect to the expandable elements 1418, and consequently to the wall 1398 of the vessel 1390, may be ascertained before the clip 910 is deployed from the carrier assembly 1354.
Turning to
This predetermined rotational orientation may substantially minimize the possibility of the primary tines 914 contacting and/or damaging the expandable elements 1418. For example, with particular reference to
The primary tines 914 are oriented such that the primary tines 914 pierce the wall 1398 of the vessel 1390 on either side of the arteriotomy 1391, as shown. With the expandable elements 1418 crisscrossing diagonally, risk of contact with the primary tines 914 is substantially reduced. Thus, the primary tines 914 may be sufficiently long to extend entirely through the wall 1398 of the vessel 1390 while avoiding the expandable elements 618.
The expandable elements 1418 may then be collapsed and/or withdrawn into the distal end 1364 of the sheath 1352. As the clip 910 is released entirely from the sheath 1352, the primary tines 914 may partially overlap, as shown in
In addition, if the clip 910 includes secondary tines 916 (such as those shown in
Once the clip 910 is successfully deployed into the wall 1398 of the vessel 1390, e.g., on either side of an arteriotomy 1391, the apparatus 1300 may be withdrawn from the passage 1392. The entire apparatus 1300 may be removed in one step, or alternatively, the obturator 1400 may first be withdrawn from the sheath 1352 before withdrawing the sheath 1352, thereby leaving the clip 910 in place to close the arteriotomy 1391 and/or seal the passage 1392. In addition, if desired, a sealant or other material may be introduced into the passage 1392 in conjunction with or separate from delivery of the clip 910 to further seal the passage 1392, as is known to those skilled in the art.
According to another aspect, the clips described herein can be manufactured in various manners. These clips can be useful for engaging tissue so as to connect tissue segments together or to close and/or seal openings through tissue such as a puncture wound in a body lumen. These clips may be used by deforming them from their generally planar configuration such that the tines are pointing in a direction generally transverse to the plane, holding the clip in this deformed condition, deploying the clip proximal to the tissue to be engaged and removing the deforming force such that the clip engages the tissue and attempts to return to its original generally planar configuration. The methods and apparatus disclosed in the above-mentioned U.S. patent application Ser. Nos. 10/081,726 and 09/732,178, now U.S. Pat. Nos. 6,623,510 and 6,719,777 can be used to deploy the clips of the present invention to engage tissue and close or seal an opening.
In such use, the deformation of the clip causes the tines to be directed generally axially away from the body of the clip and it is the elastic property of the deformed clip which causes it to attempt to return to its original generally planar configuration. The body of the device may comprise a series of looped elements which generally define an endless zigzag pattern, e.g., a sinusoidal pattern, extending about a central access. The looped elements are believed to facilitate deforming the device between the planar and transverse configurations, e.g., by distributing stresses through the device and minimizing localized stresses in the curved regions.
In another embodiment of the present invention, a clip precursor is first formed from a sheet of material, such as a superelastic alloy, such as a nickel-titanium alloy (“Nitinol”) alloy. The property of superelasticity and of certain alloys which possess that property is disclosed in U.S. Pat. No. 4,665,906, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference. This forming can be done by removing portions of the material by cutting, chemical etching, laser cutting, photochemical etching, stamping, electrical discharge machining and the like to produce a precursor such as that shown in
The precursor 1610 comprises a hoop-shaped planar body 1611 which has outwardly extending primary (longer) tines 1612 and secondary (shorter) tines 1613. For example, the primary trials may be 0.070 to 0.105 inches in length and the secondary tines may be 0.025 to 0.035 inches in length. Each of the tines terminates in a point 1614. When the precursor 1610 has been reconfigured into clip 1616 shown in
The precursor 1610 is then inverted to reconfigure it into the shape of clip 1616. In this embodiment in which the precursor is formed from a sheet of nickel-titanium alloy, the inverted precursor is then heat set, e.g., by heating to a temperature of 510° C., and then quenched to cool to room temperature. The clip 1616 will now be in the austenitic state.
Heat setting and quenching are essential to successful practice of the invention with superelastic alloys. As explained in more detail in U.S. Pat. No. 4,665,906, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference, a superelastic alloy such as nickel-titanium exists in two states, the austenitic state and the martensitic state. Such alloys will initially be in the austenitic state, e.g., when the precursor is formed. However, when the precursor is inverted to take the shape of the final clip, the stress experienced by the alloy during the inversion will cause the alloy to be partially or wholly converted to the martensitic state. Such a martensitic state is commonly referred to as stress-induced martensite. Such martensite structure has the property of superelasticity and the inverted precursor would revert to its original shape if not held in the inverted configuration.
Since, if the inverted precursor was left in the martensitic state, it would want to elastically revert to its original uninverted state, it must be converted back to austenite. Thus, heating and quenching are required to convert the inverted precursor from the martensitic state to the austenitic state such that the clip is stable in its planar configuration as shown in
The times and temperatures for heat setting of superelastic alloys of various compositions can be determined from existing literature or can be determined empirically without any difficulty. The clips are small in size and the heating and quenching may be done with any conventional heating and quenching equipment. For example, once inverted, the inverted precursor can be held in that configuration and placed in a fixture which will hold it in the inverted configuration during heat setting.
When clips are manufactured according to the present invention, the space between the tines may actually be eliminated, i.e., after inverting the precursor, the tines may be in contact with each other, in either a side-by-side or an over-and-under relationship. The number, length and spacing of the tines may be varied according to the desires of the manufacturer. Furthermore, while use of a planar precursor is a convenience in manufacturing, a planar configuration is not required. For example, the precursor could be bent along a diameter or major or minor axis of the precursor and could be heat set in such a bent configuration. Alternatively, the clip, while generally planar, may have the tines extending at an acute angle to the plane defined by the body as shown in
Still further, the clip need not be fabricated from a single material, e.g., the tines may be manufactured from a different material than the body. In such cases, a portion of the clip such as the tines may be bioabsorbable provided that the final clip is capable of elastic recovery after being deformed. An advantage of the present invention is that it permits the production of clips with tines that are 30 to 40% or more longer than those which could be made with prior direct cutting methods, because there is no limit on the length of the tine which is formed on the precursor. Thus, after the precursor is inverted, the tines may overlap the annular body.
In the alternative embodiment of this invention illustrated in
The precursor 1620 is reconfigured by imposing radially inwardly directed force on body 1621 such that precursor 1620 takes a smaller planar shape such as one of those shown in
Clips of still other configurations can be manufactured in the manner of clip 1626 by starting with a differently shaped precursor such as precursor 1630 shown in
It has been found that Nitinol sheet is stronger in one direction than in others, which may be the result of crystal orientation in the Nitinol. The clip precursors can be formed such that the primary tines are aligned with the strongest orientation of the Nitinol. It has been found, as shown in
The clips of the present invention may have primary or secondary tines which have the same or different lengths and the tines may be straight or curved. For example, radially opposed tines may have one tine at “12 o'clock” which is longer than the opposing tine at “6 o'clock.” Exemplary configurations of clip precursors with primary tines of different length are shown in
The clips of the present invention may also be delivered using the apparatus and methods described in U.S. patent application Ser. No. 10/081,723, filed Feb. 21, 2002, now U.S. Pat. No. 6,942,674, which is assigned to the assignee of the present application, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference. Similarly, the apparatus and methods disclosed in U.S. patent application Ser. No. 10/081,717, filed Feb. 21, 2002, now U.S. Pat. No. 6,695,867, which is assigned to the Assignee of the present application, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
Other features can be added to the clips including radio-opaque markers, and/or porous surfaces to promote tissue ingrowth or the clip may be coated in whole or in part with a bioabsorbable material and/or coated with a material containing a substance which is delivered to the patient for therapeutic, diagnostic or other purposes. Such coatings may comprise peptides, clotting factors or other materials designed to benefit the patient.
While the principal object of the present invention is to provide a manufacturing method which facilitates the production of clips having a small footprint, the present invention can also be used to make clips of larger dimensions since, no matter what methods are used to cut the precursor from a sheet of material, the ease of manufacture of even larger size clips is facilitated. Thus, the advantages of the present invention may be realized with regard to clips having larger sizes and clips having a variety of configurations.
Turning now to the drawings,
The body 1712 includes a plurality of looped or curved elements 1728 that are connected to one another to form the body 1712. Each looped element 1728 may include an inner or first curved region 1732 and an outer or second curved region 1734. In another embodiment, the first and second curved regions 1732, 1734 are out of phase with one another and are connected alternately to one another, thereby defining an endless sinusoidal pattern. Alternatively, other generally zigzag patterns may be provided that repeat periodically, e.g., saw tooth or square tooth patterns (not shown), instead of a sinusoidal pattern, thereby defining inner and outer regions that alternate about the body 1712.
The plurality of tines 1714 and 1716 may be biased to extend generally inwardly, e.g., towards one another and/or towards the central axis 1724. The tines 1714 and 1716 may be disposed on the first curved regions 1732, and oriented toward the central axis 1724 when the clip 1710 is in the planar configuration. The primary tines 14 are offset from the axis of symmetry 1737 of the loops from which they extend and are connected to a first curved region 1732 by a straight connecting element having a longer side 1735 and a shorter side 1736. In another embodiment, the tines 14 and 1716 may be provided in pairs opposite from one another or provided otherwise symmetrically with respect to the central axis 1724.
The tines 1714 and 1716 may include a variety of pointed tips, such as a bayonet tip, and/or may include barbs (not shown) for penetrating or otherwise engaging tissue. For example, to increase the penetration ability of the clip 1710 and/or to lower the insertion force required to penetrate tissue, each primary tine 1714, as shown in
Additionally, as shown in
As shown in
In another embodiment, the tines 1714 and 1716 and/or body 1712 are biased to move from the transverse configuration towards the planar configuration of
The looped elements 1728 may distribute stresses in the clip 1710 as it is deformed between the planar and transverse configurations, thereby minimizing localized stresses that may otherwise plastically deform, break, or otherwise damage the clip 1710 during delivery. In addition, when the clip 1710 is in the transverse configuration, the looped elements 1728 may be movable between a compressed state, such as that shown in
With the clip 1710 in the transverse configuration, the looped elements 1728 may be circumferentially and/or radially compressed to the compressed state until the clip 1710 defines a first diameter or circumference 1726a, such as that shown in
To manufacture the clip 1710 (or, similarly, any of the other clips described herein), the body 1712 and the tines 1714 and 1716 may be integrally formed from a single sheet of material, e.g., a superelastic alloy, such as Nitinol. Portions of the sheet may be removed using conventional methods, such as laser cutting, chemical etching, photo chemical etching, stamping, using an electrical discharge machine (EDM), and the like, or the method disclosed in U.S. patent application Ser. No. 10/335,075, filed Dec. 31, 2002, to form the clip. The tines 1714 and 1716 may be sharpened to a point, i.e., tips may be formed on the tines 1714 and 1716 using conventional methods, such as chemical etching, mechanical grinding, and the like.
The clip 1710 may be polished to a desired finish using conventional methods, such as electro-polishing, chemical etching, tumbling, sandblasting, sanding, and the like. Polishing may perform various functions depending on the method used to form the clip 1710. For a clip formed by laser cutting or using an EDM, polishing may remove heat affected zones (HAZ) and/or burrs from the clip. For a clip formed by photo chemical etching, polishing may create a smoother surface finish. For a clip formed by stamping, polishing may remove or reduce burrs from the bottom side of the clip, and/or may smooth the “roll” that may result on the topside of the clip from the stamping process.
In addition or alternatively, the clip 1710 may be formed from a shape memory alloy, e.g., Nitinol, with the looped elements 1728 formed initially in the compressed state and/or the clip 1710 in the planar configuration. With the clip 1710 deformed to the transverse configuration, the clip 1710 may be expanded, e.g., by applying a force radially outwards against an inner surface of the clip 1710, thereby expanding the looped elements 1728 to the expanded state. The looped elements 1728 may then be heat treated, e.g., by heating the clip 1710 to an austenitic state, to cause the looped elements 1728 to “remember” the expanded state, as is known to those skilled in the art. It may also be necessary to further heat treat the clip 1710 further, e.g., with the tines in the planar configuration to cause the body 1712 and/or tines 1714 and 1716 to “remember” and be biased towards the planar configuration, as is known to those skilled in the art. The clip 1710 may then be cooled, e.g., to a martensitic state, which may be at or close to ambient temperature, and manipulated, e.g., malleably deformed to the transverse configuration, for example, by loading the clip 1710 onto a delivery device (not shown), as described below. Thus, if the clip 1710 is subsequently heated to a predetermined temperature, e.g., at or below body temperature, the material may remember the planar configuration and/or expanded state and become biased towards them.
Each of the primary tines 1714 may have a length l1, although alternatively, as shown in
Each of the secondary tines 16 may be disposed on a first or inner curved region 32, e.g., such that one or more secondary tines 16 may be provided between opposing pairs of primary tines 14. Each of the secondary tines 16 may have a length l2 that is substantially less than the length l1 of the primary tines 14.
A secondary tine 1716 can be disposed on either side of each primary tine 1714. For example, the clip 1710 shown in
With the clip 1710 in the transverse configuration, the clip 1710 may be delivered such that the primary tines 1714 entirely penetrate the wall of a blood vessel or other body lumen, while the secondary tines 1716 only partially penetrate the wall due to their relative lengths, as explained further below.
As shown in
Turning to
In
The clip of
Any of the clips of the present invention may include one or more radiopaque markers or other markers visible using external imaging, such as fluoroscopy. For example, using the clip 1710 of
Alternatively, the clip 1710 may be partially coated with radiopaque material by using masking techniques. For example, the entire clip 1710 may first be coated with radiopaque material. The clip 1710 may then be masked at locations where the radiopaque coating is desired. For example, the looped elements 1728 of the clip 1710 may be left unmasked during this process if it is desired to leave the looped elements 1728 uncoated by radiopaque material. This may be desirable, e.g., to prevent radiopaque material from adversely affecting the flexibility of the looped elements 1728. The clip 1710 may then be treated to remove the radiopaque material from the unmasked areas, in this example, the looped elements 1728. The masking may then be removed using conventional processes, leaving the rest of the clip 1710 coated with radiopaque material.
In another alternative, one or more discrete markers may be provided at predetermined locations on the clip 1710. For example, high density or radiopaque material may be crimped or otherwise secured onto opposing double looped or circular regions 1728. In another embodiment, a plurality of pockets may be provided on the looped elements 1728 into which high density plugs (not shown) may be bonded or otherwise secured. These various radiopaque markers may also be incorporated in any of the embodiments described herein.
Any of the clips of the present invention may be coated with a substance that enhances hemostasis and/or healing of a blood vessel, e.g., by increasing a rate of regeneration of endothelium on the interior surface of the vessel, or by decreasing inflammatory response at the treatment site. In one embodiment, a suitable synthetic peptide coating may be applied to a clip to attract endothelial cells to the surface. An exemplary synthetic peptide coating may, for example, attach to the same cell binding sites as collagen. In another embodiment, a clip may be coated with a combination of clotting factors in order to promote hemostasis. For example, one side of the clip may be coated with Factor III and an endopeptidase, such as PTA, to accelerate the intrinsic clotting pathway. On the opposite side of the clip, a combination of a protein cofactor proaccelerin (Factor V) and an activated endopeptidase, such as serum prothrombin conversion accelerator (SPCA), cothromboplastin, and the like, may be applied to accelerate the extrinsic clotting pathway. The clips of the present invention may also be coated with any suitable hydrophilic polymer that swells in the presence of bodily fluids in order to reduce, minimize, or stop blood flow, thereby aiding the hemostasis process.
As described herein, the clips of the present invention may be delivered using various apparatus and methods. Suitable apparatus that may be used to deliver a clip of the present invention are disclosed in U.S. application Ser. No. 10/081,723, filed on Feb. 21, 2002, now U.S. Pat. No. 6,942,674, and entitled “Apparatus and Methods for Delivering a Closure Device” and in U.S. application Ser. No. 10/356,214, filed Jan. 30, 2003, and Ser. No. 10/638,115, filed Aug. 8, 2003, and Ser. No. 10/081,725, filed Feb. 2, 2001, now U.S. Pat. No. 6,749,621, which are assigned to the assignee of the present application, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
While the invention is susceptible to various modifications, and alternative forms, specific examples thereof have been shown in the drawings and are herein described in detail. It should be understood, however, that the invention is not to be limited to the particular forms or methods disclosed, but to the contrary, the invention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the appended claims. For example, and not by way of limitation, the features and structures of one clip can be used with any other clip described herein. Similarly, the structures and methods useable to deploy a clip can be used to deploy other clips, including, but not limited to, those clips described herein.
This is a continuation-in-part application of U.S. patent application Ser. No. 10/787,073, filed Feb. 24, 2004, which is a continuation-in-part application of U.S. patent application Ser. No. 10/435,104, filed May 9, 2003, which is a divisional application of U.S. patent application Ser. No. 10/081,726, filed Feb. 21, 2002, now U.S. Pat. No. 6,623,510, which is a continuation-in-part application of U.S. patent application Ser. No. 09/732,178, filed Dec. 7, 2000, now U.S. Pat. No. 6,719,777, each of which are incorporated herein by this reference. This is also a continuation-in-part application of U.S. patent application Ser. No. 10/335,075, filed Dec. 31, 2002, which is a continuation-in-part application of U.S. patent application Ser. No. 10/081,726, filed Feb. 21, 2002, now U.S. Pat. No. 6,623,510, which is a continuation-in-part application of U.S. patent application Ser. No. 09/732,178, filed Dec. 7, 2000, now U.S. Pat. No. 6,719,777, each of the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference. This continuation-in-part application also relates to U.S. application Ser. No. 09/732,178, filed Dec. 7, 2000, now U.S. Pat. No. 6,719,777; Ser. No. 10/081,726, filed Feb. 21, 2002, now U.S. Pat. No. 6,623,510; Ser. No. 10/335,075, filed Dec. 31, 2002; Ser. No. 10/081,723, filed Feb. 21, 2002, now U.S. Pat. No. 6,942,674; Ser. No. 10/081,717, filed Feb. 21, 2002; Ser. No. 10/356,214, filed Jan. 30, 2003 and Ser. No. 10/638,115, filed Aug. 8, 2003, the disclosures of which, and any references therein, are incorporated herein in their entirety by this reference.
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| WO 2007088069 | Aug 2007 | WO |
| WO 2008031102 | Mar 2008 | WO |
| WO 2008036384 | Mar 2008 | WO |
| WO 2008074027 | Jun 2008 | WO |
| WO 2008150915 | Dec 2008 | WO |
| WO 2009079091 | Jun 2009 | WO |
| WO 2010031050 | Mar 2010 | WO |
| WO 2010062693 | Jun 2010 | WO |
| WO 2010081101 | Jul 2010 | WO |
| WO 2010081102 | Jul 2010 | WO |
| WO 2010081103 | Jul 2010 | WO |
| WO 2010081106 | Jul 2010 | WO |
| 20010527 | Jan 2001 | ZA |
| 200100528 | Jan 2001 | ZA |
| Entry |
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| Number | Date | Country | |
|---|---|---|---|
| 20070282352 A1 | Dec 2007 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10081726 | Feb 2002 | US |
| Child | 10435104 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 10787073 | Feb 2004 | US |
| Child | 11396141 | US | |
| Parent | 10435104 | May 2003 | US |
| Child | 10787073 | US | |
| Parent | 09732178 | Dec 2000 | US |
| Child | 10081726 | US | |
| Parent | 11396141 | US | |
| Child | 10081726 | US | |
| Parent | 10335075 | Dec 2002 | US |
| Child | 11396141 | US | |
| Parent | 10081726 | Feb 2002 | US |
| Child | 10335075 | US | |
| Parent | 09732178 | Dec 2000 | US |
| Child | 10081726 | US |
