Soft tissue anchor delivery apparatus

• US 5,667,513 A
• Filed: 06/07/1995
• Issued: 09/16/1997
• Est. Priority Date: 06/07/1995
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Holdings Incorporated (Smith & Nephew PLC)
• Inventors: Smith, Graham, Torrie, Paul A.
• Primary Examiner(s): SCHMIDT, JEFFREY
• Application Number:
  US08/472,509
• Time in Patent Office: 832 Days
• Field of Search: 606/104, 606/75, 606/73, 606/72, 606/60, 606/232, 606/205, 606/207, 606/213, 606/151, 604/106, 604/107, 81/2.4, 81/44, 81/53.2, 81/453, 81/452, 81/451
• US Class Current: 606/104
• CPC Class Codes: A61B 17/0401 Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors A61B17/0642 takes precedence; fixation devices for tendons or ligaments A61F2/0811
• CPC Class Codes: A61B 2017/0409 Instruments for applying suture anchors for applying suture clamps, clips or locks A61B2017/0488
• CPC Class Codes: A61B 2017/0445 cannulated, e.g. with a longitudinal through-hole for passage of an instrument

Abstract

A soft tissue anchor delivery apparatus includes a gripping device having fingers at the distal end and configured such that they can hold a soft tissue anchor about the head portion of the anchor. An actuating tube slides over the gripper and the fingers, thus holding the fingers and the contained soft tissue anchor within the bore of the actuating tube. A pushrod is placed within the bore of the gripper. The pushrod has a countersunk head that is shaped such that it is a close fit for the head of the soft tissue anchor. The pushrod is connected to a tube having a bore so that the actuating pin of the soft tissue anchor can be pushed down into the head of the anchor. The pushrod is spring loaded so as to allow the pushrod to be driven distally upon retraction of the actuating tube, thus driving the anchor free of the deployed fingers and hence of the entire delivery system.

Claims

1. A soft tissue anchor delivery apparatus for inserting a soft tissue anchor that includes an elongated shank and an enlarged head, comprising:

a) an outer tube having an elongated bore and proximal and distal end portions;

b) an inner tube that fits the bore of the outer tube, said inner tube having a proximal end, a distal end, a handle and a longitudinal inner tube bore;

c) said inner tube having a plurality of fingers at the distal end portion thereof, said fingers being shaped to grip the soft tissue anchor member at the enlarged head portion thereof;

d) said plurality of fingers being biased to expand radially when moving from a position inside the bore of the larger tube to a position outside the bore of the larger tube;

e) a pushrod slidably disposed within the bore of the inner tube, said pushrod having proximal and distal end portions, said distal end portion having means for engaging said head of said soft tissue anchor, the pushrod being operable to drive the soft tissue anchor free of the fingers when the fingers exit the distal end of the outer tube; and

f) wherein the inner tube handle comprises a pair of interlocking members.

2. The soft tissue anchor delivery apparatus of claim 1 further comprising spring means for driving the pushrod distally upon retraction of the outer tube relative to the inner tube.

3. The soft tissue anchor delivery apparatus of claim 1 wherein the outer tube bore has a constant internal diameter.

4. The soft tissue anchor delivery apparatus of claim 1 wherein the fingers are circumferentially spaced about the wall of the inner tube.

5. The soft tissue anchor delivery apparatus of claim 1 wherein there are at least two of the fingers.

6. The soft tissue anchor delivery apparatus of claim 1 wherein the fingers extend longitudinally from the distal end of the inner tube.

7. The soft tissue anchor delivery apparatus of claim 1 further comprising a handle affixed to the proximal end of the inner tube for manipulating the inner tube relative to the outer tube.

8. The soft tissue anchor delivery apparatus of claim 1 wherein the inner tube handle interlocking members include a first member that is attached to the proximal end of the inner tube and a second member that fits the inner tube bore.

9. The soft tissue anchor delivery apparatus of claim 1 wherein the pushrod comprises an elongated member having a transversely extending flange positioned between the end portions of the elongated member.

10. The soft tissue anchor delivery apparatus of claim 9 further comprising a spring that moves the pushrod during use, wherein the pushrod flange receives one end of the spring.

11. The soft tissue anchor delivery apparatus of claim 10 wherein the spring means comprises a coil spring.

12. The soft tissue anchor delivery apparatus of claim 11 wherein the spring is mounted about the elongated member of the pushrod, one end of the spring engaging the flange.

13. The soft tissue anchor delivery apparatus of claim 9 wherein the elongated member has a pair of flanges mounted thereon, one flange positioned between the end portions of the elongated member an a second flange positioned at the distal end of the elongated member, wherein the second flange comprises said means for engaging the head of the soft tissue anchor during use.

14. The soft tissue anchor delivery apparatus of claim 1 further comprising a spring holder that supports the spring means during use, said spring means and spring holder each fitting the inner tube bore.

15. A soft tissue anchor delivery apparatus for inserting a soft tissue anchor that includes an elongated shank and an enlarged head, comprising:

a) an outer tube having an elongated bore and proximal and distal end portions;

b) an inner tube that fits the bore of the outer tube, said inner tube having a proximal end, a distal end, a handle and a longitudinal inner tube bore;

c) said inner tube having a plurality of fingers at the distal end portion thereof, said fingers being shaped to grip the soft tissue anchor member at the enlarged head portion thereof;

d) said plurality of fingers being biased to expand radially when moving from a position inside the bore of the larger tube to a position outside the bore of the larger tube;

e) a pushrod slidably disposed within the bore of the inner tube, said pushrod having proximal and distal end portions, said distal end portion having means for engaging said head of said soft tissue anchor;

f) a spring positioned within the inner tube bore, said spring driving the pushrod distally upon retraction of the outer tube relative to the inner tube, so that the pushrod drives the soft tissue anchor free of the fingers when the fingers exit the distal end of the outer tube;

g) wherein the inner tube handle comprises a pair of interlocking members.

16. A soft tissue anchor apparatus comprising:

a) a soft tissue anchor for joining a section of soft tissue to a section of hard tissue, said anchor including an anchor member with a shank, an enlarged head, and a central longitudinal open ended bore;

b) an actuating pin that fits the bore of the anchor member, said pin and the bore of the anchor member being sized and shaped so that the anchor member expands when the actuating pin is driven into the bore;

c) an outer tube having an elongated bore and proximal and distal end portions;

d) an inner tube that fits the bore of the outer tube, said inner tube having a proximal end, a distal end, and a longitudinal inner tube bore;

e) said inner tube having a plurality of fingers at the distal end portion thereof, said fingers being shaped to grip the soft tissue anchor member at the enlarged head portion thereof;

f) said plurality of fingers being expandable after moving from a position inside the bore of the larger tube to a position outside the bore of the larger tube;

g) a pushrod slidably disposed within the bore of the inner tube, said pushrod having proximal and distal end portions, said distal end portion having means for engaging said head of said soft tissue anchor;

h) a spring for driving the pushrod distally upon retraction of the outer tube relative to the inner tube, so that the pushrod drives the soft tissue anchor free of the fingers when the fingers exit the distal end of the outer tube; and

i) a spring loading member interlocking with the inner tube to spring load the pushrod by compressing the spring in between the pushrod and the spring loading member.

17. The soft tissue anchor apparatus of claim 16 wherein the outer tube bore is cylindrically shaped with a constant internal diameter.

18. The soft tissue anchor apparatus of claim 16 wherein the fingers are spaced equally about the wall of the inner tube.

19. The soft tissue anchor apparatus of claim 16 wherein there are four of the fingers.

20. The soft tissue anchor apparatus of claim 16 wherein the fingers extend longitudinally from the distal end of the inner tube.

21. The soft tissue anchor apparatus of claim 16 further comprising a pair of handles affixed to the proximal end of the inner tube for manipulating the inner tube relative to the outer tube.

22. The soft tissue anchor apparatus of claim 21 wherein the inner tube handles comprise a pair of interlocking members.

23. The soft tissue anchor apparatus of claim 22 wherein the inner tube handle interlocking members include a first member that is attached to the proximal end of the inner tube and a second member that fits the inner tube bore.

24. The soft tissue anchor apparatus of claim 16 wherein the pushrod comprises an elongated member having a transversely extending flange positioned between the end portions of the elongated member.

25. The soft tissue anchor apparatus of claim 24 wherein the pushrod flange receives one end of the spring during use.

26. The soft tissue anchor delivery apparatus of claim 25 wherein the spring means comprises a coil spring.

27. The soft tissue anchor apparatus of claim 26 wherein the spring is mounted about the elongated member of the pushrod, one end of the spring engaging the flange.

28. The soft tissue anchor delivery apparatus of claim 16 wherein the elongated member has a pair of flanges mounted thereon, one flange positioned between the end portions of the elongated member and a second flange positioned at the distal end of the elongated member, wherein the second flange comprises said means for engaging the head of the soft tissue anchor during use.

29. The soft tissue anchor delivery apparatus of claim 16 further comprising a spring holder that supports the spring during use, said spring and spring holder each fitting the inner tube bore.