Multi-start closures for open implants

Patent metadata

Field	Value
Publication number	US-9636146-B2
Application number	US-201414566356-A
Country	US
Kind code	B2
Filing date	Dec 10, 2014
Priority date	Jan 10, 2012
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

An open implant closure structure includes a helically wound guide and advancement structure having at least two helically wound forms thereon providing a multi-start closing mechanism for use between spaced arms of a cooperating open medical implant having mating helically wound structure thereon. Illustrated structures include interlocking flange forms, v-threads, square threads, reverse angle threads and buttress threads and receivers with break-off extensions and cooperating tooling.

First claim

What is claimed and desired to be secured by Letters Patent is as follows:

1. In a medical implant having a substantially cylindrical closure member and a receiver member having a first arm spaced from a second arm forming an open channel, the closure member having an axis of rotation for closing the open channel, an improvement comprising:
a) first and second helically wound v-thread forms located on the closure member, the first helically wound v-thread form having a first start and the second helically wound v-thread form having a second start; and
b) a first helically wound v-thread form on the first arm of the receiver member and a second helically wound v-thread form on the second arm of the receiver member opposite the first helically wound v-thread form and wherein simultaneous mating of the first start with the first helically wound v-thread form of the first arm and the second start with the second helically wound v-thread form of the first arm of the second arm occurs when the closure member is rotated between the first and second arms of the receiver member.

2. The improvement of claim 1 , wherein the closure member has a break-off head.

3. The improvement of claim 1 , wherein the receiver member has break-off extensions.

4. The improvement of claim 1 , further comprising a guide tool having third and fourth arms detachably attached to the receiver member, the guide tool having a third discontinuous helically wound structure on the guide tool third arm and a fourth discontinuous helically wound structure on the guide tool fourth arm and wherein simultaneous mating of the first start with the third helically wound structure and the second start with the fourth helically wound structure occurs when the closure member is rotated between the third and fourth arms of the guide tool, the guide tool third and fourth helically wound structures sized and shaped to provide transfer of the closure member between the guide tool and the bone screw upon rotation of the closure member.

5. In a medical implant having a substantially cylindrical closure member and a receiver member having a first arm spaced from a second arm forming an open channel, the closure member having an axis of rotation for closing the open channel, an improvement comprising:
a) first and second helically wound square thread forms located on the closure member, the first helically wound square thread form having a first start and the second helically wound square thread form having a second start; and
b) a first helically wound square thread form on the first arm of the receiver member and a second helically wound square thread form on the second arm of the receiver member opposite the first helically wound square thread form and wherein simultaneous mating of the first start with the first helically wound square thread form of the first arm and the second start with the second helically wound square thread form of the second arm occurs when the closure member is rotated between the first and second arms of the receiver member.

6. The improvement of claim 5 , wherein the closure member has a break-off head.

7. The improvement of claim 5 , wherein the receiver member has break-off extensions.

8. The improvement of claim 5 , further comprising a guide tool having third and fourth arms detachably attached to the receiver member, the guide tool having a third discontinuous helically wound structure on the guide tool third arm and a fourth discontinuous helically wound structure on the guide tool fourth arm and wherein simultaneous mating of the first start with the third helically wound structure and the second start with the fourth helically wound structure occurs when the closure member is rotated between the third and fourth arms of the guide tool, the guide tool third and fourth helically wound structures sized and shaped to provide transfer of the closure member between the guide tool and the bone screw upon rotation of the closure member.

9. In a medical implant having a substantially cylindrical closure member and a receiver member having a first arm spaced from a second arm forming an open channel, the closure member having an axis of rotation for closing the open channel, an improvement comprising:
a) first and second helically wound reverse angle thread forms located on the closure member, the first helically wound reverse angle thread form having a first start and the second helically wound reverse angle thread form having a second start; and
b) a first helically wound reverse angle thread form on the first arm of the receiver member and a second helically wound reverse angle thread form on the second arm of the receiver member opposite the first helically wound reverse angle thread form and wherein simultaneous mating of the first start with the first helically wound reverse angle thread form of the first arm and the second start with the second helically wound reverse angle thread form of the second arm occurs when the closure member is rotated between the first and second arms of the receiver member.

10. The improvement of claim 9 , wherein the closure member has a break-off head.

11. The improvement of claim 9 , wherein the receiver member has break-off extensions.

12. The improvement of claim 9 , further comprising a guide tool having third and fourth arms detachably attached to the receiver member, the guide tool having a third discontinuous helically wound structure on the guide tool third arm and a fourth discontinuous helically wound structure on the guide tool fourth arm and wherein simultaneous mating of the first start with the third helically wound structure and the second start with the fourth helically wound structure occurs when the closure member is rotated between the third and fourth arms of the guide tool, the guide tool third and fourth helically wound structures sized and shaped to provide transfer of the closure member between the guide tool and the bone screw upon rotation of the closure member.

13. In a medical implant having a substantially cylindrical closure member and a receiver member having a first arm spaced from a second arm forming an open channel, the closure member having an axis of rotation for closing the open channel, an improvement comprising:
a) first and second helically wound buttress thread forms located on the closure member, the first helically wound buttress thread form having a first start and the second helically wound buttress thread form having a second start; and
b) a first helically wound buttress thread form on the first arm of the receiver member and a second helically wound buttress thread form on the second arm of the receiver member opposite the first helically wound buttress thread form and wherein simultaneous mating of the first start with the first helically wound buttress thread form of the first arm and the second start with the second helically wound v-thread form of the first arm of the second arm occurs when the closure member is rotated between the first and second arms of the receiver member.

14. The improvement of claim 13 , wherein the closure member has a break-off head.

15. The improvement of claim 13 , wherein the receiver member has break-off extensions.

16. The improvement of claim 13 , further comprising a guide tool having third and fourth arms detachably attached to the receiver member, the guide tool having a third discontinuous helically wound structure on the guide tool third arm and a fourth discontinuous helically wound structure on the guide tool fourth arm and wherein simultaneous mating of the first start with the third helically wound structure a

Assignees

• Jackson Roger P

Inventors

• Jackson Roger P
• Surber James L

Classifications

• A61B2090/037

  with a frangible part, e.g. by reduced diameter · CPC title

• A61B17/7032 Primary

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title

• A61B17/7035 Primary

  Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other · CPC title

• A61B17/8665

  Nuts · CPC title

• A61B17/8685

  comprising multiple separate parts · CPC title