SPINAL IMPLANT SYSTEM AND METHOD

• US 20140052187A1
• Filed: 08/17/2012
• Published: 02/20/2014
• Est. Priority Date: 08/17/2012
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: McBride, Larry, Fiorella, David
• Granted Patent: US 9,066,761 B2
• Time in Patent Office: Days
• US Class Current: 606/264
• CPC Class Codes: A61B 17/708 with tubular extensions coaxially mounted on the bone anchors
• CPC Class Codes: A61B 17/7085 for insertion of a longitudinal element down one or more hollow screw or hook extensions, i.e. at least a part of the element within an extension has a component of movement parallel to the extension's axis

Abstract

An extender comprises a first extension including a first wall and extending between a proximal end and a distal end. The first wall defines an axial cavity including a distal portion, at least one ramp and a proximal portion. A second extension includes a projection. The projection is disposable in a first position with the distal portion of the axial cavity and the distal end of the first extension is disposed in a non-expanded orientation. The projection is slidably engageable with the at least one ramp for movement to a second position such that the projection is disposed with the proximal portion of the axial cavity and the distal end of the first extension is disposed in an expanded orientation. Methods of use are disclosed.

Claims

1. An extender comprising:

a first extension including a first wall and extending between a proximal end and a distal end, the first wall defining an axial cavity including a distal portion having a first dimension, an intermediate portion having at least one ramp and a proximal portion having a second dimension, the first dimension being greater than the second dimension, the distal end including at least one fixation surface; and

a second extension extending from adjacent the proximal end of the first extension to a distal end of the second extension, the distal end including a projection, wherein the first extension is configured for axial translation relative to the second extension such that the projection is disposable in the axial cavity in a first position such that the projection is disposed with the distal portion of the axial cavity and the distal end of the first extension is disposed in a non-expanded orientation, and the projection is slidably engageable with the at least one ramp for movement to a second position such that the projection is disposed with the proximal portion of the axial cavity and the distal end of the first extension is disposed in an expanded orientation.

2. An extender as recited in claim 1, wherein the first extension includes two spaced apart first extensions.

3. An extender as recited in claim 1, wherein the first wall includes a first ramp and a second ramp disposed adjacent the intermediate portion, the ramps being spaced apart to define the second dimension.

4. An extender as recited in claim 1, wherein the at least one ramp includes a first flange and the distal end of the second extension includes a second flange that defines a flange cavity configured for disposal of the first flange such that the second flange slidably engages the first flange during axial translation.

5. An extender as recited in claim 1, wherein the distal end of the first extension includes an inner surface that includes the at least one fixation surface, the at least one fixation surface including a first projection and a second projection.

6. An extender as recited in claim 1, further comprising an actuator fixed with the second extension, the actuator being engageable with the first extension to cause the axial translation.

7. An extender as recited in claim 1, further comprising an actuator fixed with the second extension, the proximal end of the first extension including a threaded outer surface, the actuator including a threaded inner surface engageable with the threaded outer surface to cause the axial translation.

8. An extender as recited in claim 1, further comprising an actuator fixed with the second extension, the actuator being engageable with the first extension to cause the axial translation and including an inner surface that defines a cavity configured for movable disposal of an instrument.

9. An extender as recited in claim 8, wherein the inner surface includes a first threaded surface engageable with the first extension to cause the axial translation and a second threaded surface engageable with the instrument to cause axial translation of the instrument relative to the first extension.

10. An extender as recited in claim 9, wherein the actuator includes a coupling element that disengages the instrument from the second threaded surface to facilitate slidable axial translation of the instrument relative to the first extension.

11. An extender comprising:

a first member defining a first longitudinal axis and extending between a proximal end and a distal end, the first member including two spaced apart first extensions, each of the first extensions including a wall including a first sliding contact surface that defines an axial slot including a distal portion having a first dimension, an intermediate portion having at least one ramp and a proximal portion having a second dimension, the first dimension being greater than the second dimension, each of the first extensions including an expandable capture member having at least one fixation surface adjacent the distal end; and

a second member extending from adjacent the proximal end of the first member to a distal end of the second member, the second member including two spaced apart second extensions, each of the second extensions including a projection having a second sliding contact surface,

wherein the first member is configured for axial translation in a first direction relative to the second member such that the projections are disposable in respective axial slots in a first position such that each of the projections are disposed with the distal portion of the respective axial slot and the respective capture member is disposed in a non-expanded orientation, and the first sliding contact surfaces are engageable with the second sliding contact surfaces for movement to a second position such that the projections are disposed with the proximal portion of the axial slot and a respective capture member is disposed in an expanded orientation.

12. An extender as recited in claim 11, wherein the at least one ramp is tapered in a distal to a proximal orientation.

13. An extender as recited in claim 11, wherein the first sliding contact surface of each of the first extensions includes a first ramp and a second ramp respectively disposed adjacent the intermediate portion, the ramps being spaced apart to define the second dimension.

14. An extender as recited in claim 11, wherein the wall of at least one of the first extensions includes a first flange and the distal end of at least one of the second extensions includes a second flange that defines a flange cavity configured for disposal of the first flange such that the second flange slidably engages the first flange during axial translation.

15. An extender as recited in claim 11, wherein the at least one fixation surface includes a first projection and a second projection.

16. An extender as recited in claim 11, further comprising an actuator fixed with the second member, the actuator being engageable with the first member to cause the axial translation.

17. An extender as recited in claim 11, further comprising an actuator fixed with the second member, the proximal end of the first member including a threaded outer surface, the actuator including a threaded inner surface engageable with the threaded outer surface to cause the axial translation.

18. An extender as recited in claim 11, further comprising an actuator fixed with the second member, the actuator being engageable with the first member to cause the axial translation and including an inner surface that defines a cavity configured for movable disposal of an instrument.

19. An extender as recited in claim 18, wherein the inner surface includes a first threaded surface engageable with the first member to cause the axial translation and a second threaded surface engageable with the instrument to cause axial translation of the instrument relative to the first member.

20. A spinal implant system comprising:

an extender comprising a first member defining a first longitudinal axis and extending between a proximal end and a distal end, the first member including a pair of spaced apart first extensions, each of the first extensions including a wall including a first sliding contact surface that defines an axial slot including a distal portion having a first dimension, an intermediate portion having a first ramp and a second ramp and a proximal portion having a second dimension, the first dimension being greater than the second dimension, the ramps being tapered to the second dimension, the wall of each of the first extensions including a first flange, each of the first extensions including an expandable capture member having at least one fixation surface adjacent the distal end,

a second member extending from adjacent to the proximal end of the first member to a distal end of the second member, the second member including a pair of spaced apart second extensions, each of the second extensions including a projection including a second sliding contact surface, the distal end of each of the second extensions including a second flange that defines a flange cavity configured for disposal of the first flange such that the second flange slidably engages the first flange, and

an actuator fixed with the second member and engageable with the first member to cause axial translation of the first member relative to the second member; and

a bone fastener including a proximal portion that defines an implant cavity and a distal portion configured to penetrate tissue,

wherein the actuator is engageable to cause the axial translation of the first member in a first direction relative to the second member such that the projections are disposable in respective axial slots in a first position such that each of the projections are disposed with the distal portion of a respective axial slot and the respective capture member is disposed in a non-expanded orientation such that the at least one fixation surface captures the bone fastener, and the first sliding contact surfaces are engageable with the second sliding contact surfaces for movement to a second position such that the projections are disposed with the proximal portion of the axial slot and the respective capture member is disposed in an expanded orientation to release the bone fastener.