BONE FASTENER FOR A SPINAL SURGICAL SYSTEM

• US 20130103096A1
• Filed: 10/24/2011
• Published: 04/25/2013
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Miller, Keith E.
• Granted Patent: US 9,414,862 B2
• Time in Patent Office: Days
• US Class Current: 606/305
• CPC Class Codes: A61B 17/7032 Screws or hooks with U-shaped head or back through which longitudinal rods pass
• CPC Class Codes: A61B 17/7037 wherein pivoting is blocked when the rod is clamped
• CPC Class Codes: A61B 17/7077 for moving bone anchors attached to vertebrae, thereby displacing the vertebrae
• CPC Class Codes: A61B 17/7082 for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws driving other bone screws A61B17/8875
• 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
• CPC Class Codes: A61B 2090/037 with a frangible part, e.g. by reduced diameter

Abstract

A bone fastener includes a receiver defining a longitudinal axis and extending between a proximal end and a distal end, the proximal end including a first wall and a second wall that define an implant cavity, each wall having a proximal face. At least one of the first wall and the second wall include an extension extending proximally from the proximal face along the longitudinal axis, the extension having a distal end integral with the proximal face and a proximal end including a first locking part configured for fixation with a second locking part of an instrument. A bone penetrating member has a proximal end and a distal end, the proximal end of the bone penetrating member being connected with the distal end of the receiver.

Claims

1. A bone fastener comprising:

a receiver defining a longitudinal axis and extending between a proximal end and a distal end, the proximal end including a first wall and a second wall that define an implant cavity, each wall including a proximal face;

at least one of the first wall and the second wall comprising an extension extending proximally from the proximal face along the longitudinal axis, the extension including a distal end integral with the proximal face and a proximal end comprising a first locking part configured for fixation with a second locking part of an instrument; and

a bone penetrating member having a proximal end and a distal end, the proximal end of the bone penetrating member connected with the distal end of the receiver.

2. The bone fastener of claim 1, wherein the first and second walls each include an inner surface that defines the implant cavity, the inner surfaces including threads adjacent the proximal faces thereof.

3. The bone fastener of claim 1, wherein the extension is monolithically formed with the first or second wall.

4. The bone fastener of claim 1, wherein the extension are configured so as to extend past the proximal face so that the extender shields the integral connection from stress while the extender is attached.

5. The bone fastener of claim 1, wherein the extension includes an arcuate surface configuration.

6. The bone fastener of claim 1, wherein the extension and the first and second walls define an integral connection therebetween, the integral connection includes a relief.

7. The bone fastener of claim 1, wherein the extension and the first and second walls define an integral connection therebetween, the integral connection includes a reduced thickness portion or perforations.

8. The bone fastener of claim 1, further comprising the first wall comprising a first extension extending proximally from the proximal face of the first wall and the second wall comprising a second extension extending proximally from the proximal face of the second wall.

9. The bone fastener of claim 1, wherein the first locking part and the second locking part comprise a cavity and a protrusion configured for disposal in the cavity.

10. The bone fastener of claim 1, wherein the instrument includes an extender.

11. The bone fastener of claim 1, wherein the instrument includes an inner surface that defines an elongated axial cavity configured for disposal of the extension.

12. The bone fastener of claim 1, wherein the instrument includes an extender such that first elongated member and a second elongated member define a cavity therebetween for disposal of a vertebral rod.

13. The bone fastener of claim 11, wherein the inner surface has an arcuate configuration.

14. A spinal surgical system comprising:

a bone fastener comprising a receiver defining a longitudinal axis and extending between a proximal end and a distal end, the proximal end including a first arm and a second arm that define an implant cavity, each arm including a proximal face, the first arm comprising a first extension integrally connected with the proximal face of the first arm along the longitudinal axis, the first extension comprising a locking part, the second arm comprising a second extension integrally connected with the proximal face of the second arm along the longitudinal axis, the second extension comprising a locking part, the bone fastener further comprising a bone penetrating member connected with the distal end of the receiver; and

an instrument including a first elongated member and a second elongated member, the first elongated member includes an inner surface defining an elongated axial cavity configured for disposal of the first arm and a locking part configured for fixation with the locking part of the first arm, the second elongated member includes an inner surface defining an elongated axial cavity configured for disposal of the second arm and a locking part configured for fixation with the locking part of the second arm.

15. The bone fastener of claim 14, wherein the first and second extensions are configured so as to wrap around the first and second arms so that lateral forces placed on the first and second extensions are transmitted to a head of the bone penetrating member.

16. The bone fastener of claim 14, wherein the extensions and the arms define an integral connection therebetween, wherein the integral connections include a relief.

17. The bone fastener of claim 14, wherein the extensions and the arms define an integral connection therebetween, respectively, the integral connections including a reduced thickness portion.

18. The bone fastener of claim 14, wherein the locking part of the first arm and the locking part of the first elongated member comprise a cavity and a protrusion configured for disposal in the cavity.

19. The bone fastener of claim 14, wherein the locking part of the first arm and the locking part of the first elongated member comprise a cavity and a protrusion configured for disposal in the cavity, and the locking part of the second arm and the locking part of the second elongated member comprise a cavity and a protrusion configured for disposal in the cavity.

20. A spinal surgical system comprising:

a bone fastener comprising a receiver defining a longitudinal axis and extending between a proximal end and a distal end, the proximal end including a first arm and a second arm that define a U-shaped channel, each arm including a proximal face, the first arm comprising a first extension monolithically formed with the proximal face of the first arm along the longitudinal axis, the first extension comprising a protrusion, the second arm comprising a second extension monolithically formed with the proximal face of the second arm along the longitudinal axis, the second extension comprising a protrusion, the bone fastener further comprising a bone penetrating member connected with the distal end of the receiver;

an extender including a first elongated member and a second elongated member that define a rod cavity therebetween, the first elongated member includes an inner surface defining an elongated axial cavity configured for disposal of the first arm and an opening configured for fixation with the protrusion of the first arm, the second elongated member includes an inner surface defining an elongated axial cavity configured for disposal of the second arm and an opening configured for fixation with the protrusion of the second arm; and

a vertebral rod configured for manipulation within the rod cavity and fixation within the U-shaped channel.