CN-115916069-B - Self-stopping tissue anchoring member

Abstract

A tissue anchor (12, 12') includes an anchor portion (34) and a crown (38) coupled thereto. The crown includes an anchor head (30) fixedly coupled to the anchor portion, a driver interface (41), and a socket (24). The socket may be fixedly coupled to the driver interface and shaped to receive the anchor head. In the first state, the anchor head is snugly seated within the socket such that torque applied to the driver interface is transferred to the anchor portion, thereby facilitating screwing of the anchor portion into tissue. Threading the anchor portion into tissue pulls the anchor head distally out of the socket, thereby transitioning the anchor to a second state in which torque applied to the driver interface rotates the socket relative to the anchor head and anchor portion. Other embodiments are also described.

Inventors

• H. BRAUN
• Y. Cahill

Assignees

• 爱德华兹生命科学创新(以色列)有限公司

Dates

Publication Date

20260512

Application Date

20210422

Priority Date

20200619

Claims (20)

1. 1. A system for tissue of a subject, the system comprising: a driver, and A tissue anchor, the tissue anchor comprising: an anchor portion configured to be screwed distally into the tissue by rotation about a longitudinal axis of the anchor, and A crown coupled to a proximal portion of the anchor portion, defining a tissue-facing surface, and comprising: An anchor head fixedly coupled to the anchor portion such that screwing the anchor portion into the tissue moves the anchor head distally along the longitudinal axis toward the tissue, A driver interface configured to be engaged by the driver, and A socket fixedly coupled to the driver interface and shaped to receive the anchor head within the socket, the tissue-facing surface distally facing away from the socket, Wherein the tissue anchor has: a first state in which the anchor head is snugly seated within the socket such that torque applied by the driver to the driver interface rotates the socket, the anchor head and the anchor portion, thereby facilitating threading of the anchor portion into the tissue, and A second state in which the anchor head is disposed distal of the socket such that torque applied by the driver to the driver interface rotates the socket relative to the anchor head and the anchor portion, and Wherein the tissue anchor is configured to transition from the first state to the second state in response to the anchoring portion having been screwed into the tissue sufficiently deep such that the tissue resists further distal movement of the tissue-facing surface while the anchoring portion is screwed into the tissue pulling the anchor head distally out of the socket.
2. 2. The system of claim 1, wherein the driver interface defines a chassis that separates the driver from the anchor head when the driver engages the driver interface.
3. 3. The system of claim 1, wherein the anchor head is shaped such that a cross-section of the anchor head defines a non-circular profile.
4. 4. The system of claim 3, wherein the anchor head is shaped such that the cross-section of the anchor head defines a plurality of outer sides.
5. 5. The system of claim 3, wherein the anchor head is shaped such that the cross-section of the anchor head defines a polygon.
6. 6. The system of claim 5, wherein the polygon is at least one of a square and a hexagon.
7. 7. The system of any one of claims 1 to 6, wherein the tissue is tissue of a heart of the subject, and wherein the tissue anchor is transluminally advanceable to the heart.
8. 8. The system of claim 7, wherein the driver comprises a flexible shaft and a driver head at a distal end of the shaft such that the driver can be advanced transluminally to the heart.
9. 9. The system of any one of claims 1 to 6, wherein the crown includes a sleeve sized to define: The driver interface is provided with a drive interface for the drive, The socket is formed in a shape such that, The tissue-facing surface, and A free region disposed between the socket and the tissue-facing surface, Wherein the anchor head is disposed within the free region when the anchor is in the second state.
10. 10. The system of claim 9, wherein the anchor head is rotatable relative to the socket when the anchor head is disposed in the free region.
11. 11. The system of claim 9, wherein the driver comprises a driver head shaped to define a shoulder: on one side of the driver head, and Which is dimensioned such that the shoulder contacts the proximal surface of the cannula when the driver interface is engaged by the driver head.
12. 12. The system of claim 9, further comprising a spring disposed within the cannula between the anchor head and the tissue-facing surface, wherein the anchor is configured such that when the anchor transitions from the first state to the second state: Screwing the anchor portion into the tissue pulls the anchor head distally out of the socket, compressing the spring.
13. 13. The system of claim 12, wherein the anchor is configured such that when the anchor transitions from the first state to the second state, screwing the anchor portion into the tissue pulls the anchor head distally out of the socket, compressing the spring and pressing the tissue-facing surface against the tissue.
14. 14. The system of claim 12, wherein the anchor is configured such that, when the anchor transitions from the first state to the second state, screwing the anchor portion into the tissue pulls the anchor head distally out of the socket, compressing the spring when the anchor head is in: partially disposed within the socket, and Partially disposed within the free region.
15. 15. The system of any one of claims 1-6, further comprising an implant, wherein the tissue anchor is configured to secure the implant to the tissue.
16. 16. The system of claim 15, wherein the implant comprises a tether or a constriction member, wherein the tissue anchor is configured to secure the tether or constriction member to the tissue such that applying tension to the tether or constriction member changes the shape and/or size of the tissue.
17. 17. A system, comprising: A tissue anchor, the tissue anchor comprising: an anchor portion configured to be rotatable about a longitudinal axis of the anchor, and An anchor head fixedly coupled to the anchor portion such that rotating the anchor portion into tissue moves the anchor head distally along the longitudinal axis toward the tissue, A socket shaped to receive the anchor head within the socket, Wherein the tissue anchor has: A first state in which the anchor head is snugly seated within the socket such that torque applied to the tissue anchor by the driver rotates the socket, the anchor head and the anchor portion, thereby facilitating threading of the anchor portion into the tissue, and A second state in which the anchor head is disposed distal to the socket such that torque applied to the tissue anchor by the driver rotates the socket relative to the anchor head and the anchor portion.
18. 18. The system of claim 17, wherein the tissue anchor is configured to transition from the first state to the second state in response to the anchor portion having been screwed into the tissue sufficiently deep that the tissue pulls the anchor head distally out of the socket to resist further rotation.
19. 19. The system of any one of claims 17 to 18, wherein the tissue anchor comprises a crown coupled to a proximal portion of the anchor portion, the crown defining a tissue-facing surface distally facing away from the socket.
20. 20. The system of any one of claims 17 to 19, wherein the tissue anchor comprises a driver interface engageable by the driver and configured to allow the driver to apply torque to the tissue anchor.

Description

Self-stopping tissue anchoring member Cross Reference to Related Applications The present application claims priority from U.S. provisional patent application 63/041,423 to Brauon et al, filed on 6/19 in 2020, which is incorporated herein by reference. Background Tissue anchors may be used in a range of medical applications (e.g., for securing implants to tissue). The screwable tissue anchor may be configured to convert torque into distal motion, whereby the anchor (e.g., an anchoring portion thereof) is screwed into tissue. Disclosure of Invention This summary is intended to provide some examples and is not intended to limit the scope of the invention in any way. For example, unless a claim expressly recites such a feature, any feature included in an example of this disclosure is not required by the claim. Furthermore, the features, components, steps, concepts, etc. described in the summary and examples elsewhere in this disclosure may be combined in a variety of ways. Various features and steps as described elsewhere in this disclosure may be included in examples summarized herein. Some applications herein relate to tissue anchors that facilitate controlled anchoring of the tissue anchor into tissue (such as heart tissue) of a subject. That is, the tissue anchor itself includes features that facilitate such control. For some applications, additional devices or system component(s), such as anchor drivers, are provided for screwing the anchoring portion of the tissue anchor into tissue. For some applications, the tissue anchors limit the amount of torque available to screw the anchor into the tissue. For some applications, the tissue anchor limits the depth to which the tissue anchor can be screwed into tissue. Some tissue anchors described herein can include an anchor portion and a crown coupled to the anchor portion. The crown may include an anchor head, a driver interface, and a socket. The anchor head may be fixedly coupled to the anchor portion. The socket may be fixedly coupled to the driver interface and may be further shaped to receive the anchor head. In the first state, the anchor head is snugly seated within the socket such that torque applied to the driver interface is transferred to the anchor portion, thereby facilitating screwing of the anchor portion into tissue. Threading the anchor portion into tissue pulls the anchor head distally out of the socket, thereby transitioning the anchor to a second state in which torque applied to the driver interface rotates the socket relative to the anchor head and anchor portion, e.g., such that torque is no longer transferred to the anchor portion, e.g., such that further threading of the anchor portion into tissue is not possible. Some tissue anchors described herein can include a crown that includes an anchor head fixedly coupled to an anchor portion. The crown may define a driver interface configured to be engaged by a driver. The crown may also define a tissue-facing surface such that screwing the anchor portion into tissue moves the tissue-facing surface distally of the tissue. For some applications, the crown may include a socket that may be fixedly coupled to the driver interface and shaped to receive the anchor head. For some such applications, the tissue anchor may have (i) a torque transmitting state in which the anchor head is disposed within the socket such that torque applied by the driver to the driver interface rotates the socket, the anchor head, and the anchor portion, thereby screwing the anchor portion into tissue, and (ii) a non-torque transmitting state in which the anchor head is disposed distally from the socket such that applied torque is not transmitted (or at least significantly reduced) from the interface to the anchor head and anchor portion. For such applications, contact between the tissue-facing surface and the tissue may increase resistance against further distal movement of the tissue-facing surface. At this stage, further threading of the anchor may pull the anchor head distally out of the socket (e.g., toward the tissue-facing surface) such that the tissue anchor transitions from a torque-transmitting state to a non-torque-transmitting state, thereby limiting distal forces applied to the tissue by the tissue-facing surface. For some such applications, the tissue anchor may further comprise a spring disposed between the anchor head and the tissue-facing surface. Pulling the anchor head distally out of the socket and pulling the spring between the compressible anchor head and the tissue-facing surface toward the tissue-facing surface, thereby facilitating continued threading of the anchor portion into tissue as the tissue anchor transitions from the torque-transmitting state to the non-torque-transmitting state. For some applications, the crown may include a slip clutch that transfers torque from the driver interface to the anchor head while limiting the transferred torque from exceeding a torque threshold. For some applic