Bone Compression Screws

Patent metadata

Field	Value
Publication number	US-2016287301-A1
Application number	US-201615089558-A
Country	US
Kind code	A1
Filing date	Apr 3, 2016
Priority date	Apr 3, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Bone compression screws are characterized by a two-piece compression screw assembly comprising a screw component and a sleeve component. The screw component has external male bone screw threading at a distal end, external male machine screw threading on a proximal end, and a smooth shank between the threaded distal and proximal ends. The screw component may be solid, cannulated, slotted, fenestrated, fluted, helically fluted, or any combination thereof. The sleeve component has external male bone screw threading with a pitch that can be equal to, smaller than, or greater than the thread pitch of the screw component, an internal bore extending from a proximal end of the sleeve component to the distal end of the sleeve component and sized for reception over the proximal end of the screw component. Internal female machine screw threading is configured to mate with the external male machine screw threading of the screw component.

First claim

What is claimed is:

1 . A bone compression screw comprising:
a screw component; and a sleeve component having a central bore extending from a first end to a second end; the screw component having a proximal end, a middle section, and a distal end, the proximal end having first threading, and the distal end having second threading, the first threading defining a first diameter and the second threading defining a second diameter, wherein the first diameter is less than the second diameter; and the sleeve component having third threading on an inside surface of the central bore and configured to be received on the first threading of the proximal end of the screw component, and fourth threading on an outside surface of the sleeve component.

2 . The bone compression screw of claim 1 , wherein the first threading of the proximal end of the screw component and the third threading of the sleeve component are machine screw threading, and the first threading of the distal end of the screw component and the fourth threading of the sleeve component are bone screw threading.

3 . The bone compression screw of claim 2 , wherein the screw component includes a longitudinal bore extending through the proximal end, the middle section, and the distal end.

4 . The bone compression screw of claim 3 , wherein the screw component has one or more slots in the middle section and extending transverse to the longitudinal bore.

5 . The bone compression screw of claim 3 , wherein the screw component has one or more fenestrae holes in the middle section and extending transverse to the longitudinal bore.

6 . The bone compression screw of claim 3 , wherein the screw component includes first fluting in the second threading of the distal end and extending to the middle section, and second fluting in the second threading of the distal end and extending to the middle section.

7 . The bone compression screw of claim 6 , wherein the first and second fluting of the screw component are helical.

8 . The bone compression screw of claim 7 , wherein the screw component further comprises one or more slots extending through the first and second helical fluting and transverse to the longitudinal bore.

9 . The bone compression screw of claim 7 , wherein the screw component further comprises a plurality of fenestrae holes extending through the first and second fluting and transverse to the longitudinal bore.

10 . A bone compression screw comprising:
a screw component having a proximal end, a distal end, and a middle section between the proximal end and the distal end, the proximal end having proximal threading, the middle section having an unthreaded outer surface, and the distal section having distal threading; and a sleeve component having a central bore extending from a first end to a second end, internal threading on an inside surface of the central bore and configured to be received on the proximal threading of the proximal end of the screw component, and external threading on an outside surface of the sleeve component.

11 . The bone compression screw of claim 10 , wherein the proximal threading of the proximal end of the screw component and the internal threading of the sleeve component are machine screw threading, and the distal threading of the distal end of the screw component and the external threading of the sleeve component are bone screw threading.

12 . The bone compression screw of claim 11 , wherein the screw component includes a longitudinal bore extending through the proximal end, the middle section, and the distal end.

13 . The bone compression screw of claim 12 , wherein the screw component has one or more slots in the middle section and extending transverse to the longitudinal bore.

14 . The bone compression screw of claim 12 , wherein the screw component has one or more fenestrae holes in the middle section and extending transverse to the longitudinal bore.

15 . The bone compression screw of claim 12 , wherein the screw component includes first fluting in the second threading of the distal end and extending to the middle section, and second fluting in the second threading of the distal end and extending to the middle section.

16 . The bone compression screw of claim 15 , wherein the first and second fluting of the screw component are helical.

17 . The bone compression screw of claim 16 , wherein the screw component further comprises one or more slots extending through the first and second helical fluting and transverse to the longitudinal bore.

18 . The bone compression screw of claim 16 , wherein the screw component further comprises a plurality of fenestrae holes extending through the first and second fluting and transverse to the longitudinal bore.

19 . A method of compressing boney anatomy comprising:
providing a bone compression screw per claim 1 or 10 ; assemble the sleeve component onto the proximal end of the screw component; install the assembled bone compression screw to a desired depth in boney anatomy; and independently drive the sleeve component about the screw component while the screw component remains fixed.

Assignees

• Life Spine Inc

Inventors

• Mehl David T
• Predick Daniel P
• Butler Michael S

Classifications

• A61B17/863 Primary

  with thread interrupted or changing its form along shank, other than constant taper · CPC title

• A61B17/8685

  comprising multiple separate parts · CPC title

• A61B17/864

  hollow, e.g. with socket or cannulated · CPC title

• A61B17/8635

  Tips of screws · CPC title