Expandable Orthopedic Device

• US 20140031940A1
• Filed: 04/07/2011
• Published: 01/30/2014
• Est. Priority Date: 04/07/2011
• Status: Active Grant

• Current Assignee: Stryker European Operations Limited (Stryker Corporation)
• Original Assignee: Vexim SAS
• Inventors: Banouskou, Ezzine
• Granted Patent: US 9,414,933 B2
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61B 17/7065 Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
• CPC Class Codes: A61B 17/8841 Tools specially adapted to engage a prosthesis
• CPC Class Codes: A61F 2/4425 made of articulated components

Abstract

Methods and apparatuses for restoration of human or animal bone anatomy, which may include introduction, into a bone of an expansible implant capable of expansion in a single determined plane, positioning the expansible implant in the bone in order to correspond the single determined plane with a bone restoration plane and opening out the expansible implant in the bone restoration plane. A first support surface and a second support surface spread tissues within bone. The embodiments of the disclosure may also include injecting a filling material around the implant.

Claims

1. A vertebral expandable implant, comprising:

at least one bearing surface which expands away from a central longitudinal axis of the implant;

a first implant end and an opposed second implant end, wherein each end includes an opening or recess, and wherein the ends are intended to move toward one another during expansion of the implant;

a retaining member comprising an elongate structure having a first end and second end, wherein each end is configured to engage with a respective opening or recess of each implant end, and wherein at least one end comprises a plurality of ridges and corresponding grooves therebetween; and

at least one retaining member engagement member provided within a recess adjacent the first implant end, wherein the engagement member is configured to fit substantially within a groove of the plurality of grooves of the retaining member;

wherein;

the recess comprises a first end having sufficient depth to allow passage of the engagement member when the engagement member is positioned on a ridge of the retaining member, a second end lacks sufficient depth to allow passage of the engagement member when the engagement member is positioned on a ridge of the retaining member, and

the retaining member is configured for retaining the implant in an expanded configuration by substantially preventing contraction of the implant when expanded.

2. The expandable implant according to claim 1, wherein the plurality of ridges and grooves at least partially circumscribe the outer surface of the retaining member.

3. The expandable implant according to claim 1, wherein the plurality of ridges and grooves completely circumscribes a circumference of the outer surface of the retaining member.

4. The expandable implant according to claim 1, wherein the plurality of grooves extend inward away from the outer surface of the retaining element, wherein upon expansion of the implant, the engagement member(s) moves between ridges and grooves during the passage of the retaining member.

5. The expandable implant according to claim 1, wherein the retaining element is tubular and the one or more recesses at least partially circumscribe the outer surface of the retaining member.

6. The expandable implant according to claim 1, wherein the retaining element is tubular and comprises a lumen configured for allowing the passage of a flowable material therethrough.

7. The expandable implant according to claim 6, wherein the retaining element further comprises an aperture configured for allowing the egress of the flowable material from the lumen of the tubular retaining element.

8. The expandable implant according to claim 1, wherein at least one of the end members is configured for association with an implant expander.

9. The expandable implant according to claim 8, wherein the implant expander comprises a proximal portion and a distal portion, wherein the distal portion is configured for association with at least one of the end members of the implant.

10. The expandable implant according to claim 9, wherein the proximal portion of the implant expander is configured for being coupled to an injection member of an injection system.

11. The expandable implant according to claim 10, wherein the proximal portion comprises a luer lock, threaded, or bayonet configuration.

12. The expandable implant according to claim 1, wherein expansion of the implant comprises movement of at least one of the end members relative to the retaining element.

13. The expandable implant of claim 7, wherein the flowable material comprises a bone cement or bone graft.

14. The expandable implant of claim 1, wherein the engagement member is a circlips.

15. A method for retaining an expandable implant in an expanded condition, the said method comprising:

introducing into a bone an expansible implant,

said implant comprises at least one bearing surface which expands away from a central longitudinal axis of the implant; and

a first implant end and an opposed second implant end, wherein the ends are intended to move toward one another during expansion of the implant, and wherein each end includes an opening or retaining recess, said retaining recess housing an engagement member;

expanding the implant such that the implant engages a mechanical resistance configured to prevent the compression of the implant, wherein said mechanical resistance is placed between the first implant end and the opposed second implant end;

wherein said mechanical resistance comprising a retaining member comprising an elongate structure having a first end and second end, wherein at least one end comprises a plurality of ridges and corresponding grooves therebetween, and wherein the at least one end is configured to engage a respective opening or retaining recess of at least one implant end;

positioning the retaining member such that the engagement member engages at least one groove of the retaining member, wherein the engagement member is configured to fit substantially within a groove of the plurality of grooves of the retaining member;

wherein the retaining recess is configured to permit passage of the engagement element over the ridges of the retaining element during expansion on the implant, and wherein the retaining recess is configured to block passage of the engagement element over a ridge of the retaining element upon application of a compression force to the implant, thereby retaining the engagement element in a groove of the retaining member, and thereby retaining the implant in an expanded configuration by substantially preventing contraction of the implant when expanded.

16. The method according to claim 15, wherein the plurality of ridges and grooves at least partially circumscribe the outer surface of the retaining member.

17. The method according to claim 15, wherein the plurality of ridges and grooves completely circumscribes a circumference of the outer surface of the retaining member.

18. The method according to claim 15, wherein the plurality of grooves extend inward away from the outer surface of the retaining element, wherein upon expansion of the implant, the engagement member(s) moves between ridges and grooves during the passage of the retaining member.

19. The method according to claim 15, wherein the retaining element is tubular and the one or more recesses at least partially circumscribe the outer surface of the retaining member.

20. The method according to claim 15, wherein the retaining element is tubular and comprises a lumen configured for allowing the passage of a flowable material therethrough.

21. The method according to claim 20, wherein the retaining element further comprises an aperture configured for allowing the egress of the flowable material from the lumen of the tubular retaining element.

22. The method of claim 20, wherein the flowable material comprises a bone cement or bone graft.

23. The method according to claim 15, wherein at least one of the end members is configured for association with an implant expander.

24. The method according to claim 23, wherein the implant expander comprises a proximal portion and a distal portion, wherein the distal portion is configured for association with at least one of the end members of the implant.

25. The method according to claim 24, wherein the proximal portion of the implant expander is configured for being coupled to an injection member of an injection system.

26. The method according to claim 25, wherein the proximal portion comprises a luer lock, threaded, or bayonet configuration.

27. The method according to claim 15, wherein expansion of the implant comprises movement of at least one of the end members relative to the retaining element.