BONE SCREW SYSTEM AND METHOD FOR THE FIXATION OF BONE FRACTURES

• US 20090254129A1
• Filed: 04/16/2009
• Published: 10/08/2009
• Est. Priority Date: 04/30/2007
• Status: Abandoned Application

• Current Assignee: OrthoIP, LLC
• Original Assignee: OrthoIP, LLC
• Inventors: Tipirneni, Kishore, Vassello, Wayne
• Application Number:
  US12/425,225
• Publication Number:
  US 20090254129A1
• Time in Patent Office: Days
• US Class Current: 606/309
• CPC Class Codes: A61B 17/742 having one or more longitudinal elements oriented along or parallel to the axis of the neck
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61B 17/746 the longitudinal elements coupled to a plate opposite the femoral head
• CPC Class Codes: A61B 17/8004 with means for distracting or compressing the bone or bones
• CPC Class Codes: A61B 17/8047 wherein the additional element surrounds the screw head in the plate hole A61B17/8052 takes precedence
• CPC Class Codes: A61B 17/8052 immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
• CPC Class Codes: A61B 17/8057 the interlocking form comprising a thread
• CPC Class Codes: A61B 17/861 specially shaped for gripping driver
• CPC Class Codes: A61B 17/8625 Shanks, i.e. parts contacting bone tissue
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts
• CPC Class Codes: A61B 17/8863 Apparatus for shaping or cutting osteosynthesis equipment by medical personnel
• CPC Class Codes: A61B 17/8869 Tensioning devices
• CPC Class Codes: A61B 17/8877 characterised by the cross-section of the driver bit

Abstract

A bone screw comprising a sleeve and a shaft reciprocally received within the sleeve. The bone screw may be partially or fully extended prior to insertion into a bone by inserting a driver into a longitudinal opening in the sleeve to push the shaft out of the sleeve. The bone screw may be used in connection with a locking plate or other stabilization device. The sleeve of the bone screw may have a smooth distal end. The distal end may have a wider diameter than the main body of the sleeve so as to sit within a counter bore in the locking plate. A threaded set screw may be used to secure the bone screw within the locking plate.

Claims

1. A bone screw comprising:

a shaft having a proximal portion and a distal head component, wherein the distal end component is insertable through a first bone portion and attachable to a second bone portion, wherein the shaft is configured to be extended into at least a partially extended position relative to a sleeve; and

the sleeve having a longitudinal opening, the sleeve operable to reciprocally receive the proximal portion of the shaft.

2. The bone screw of claim 1, wherein the shaft is configured to be extended by inserting an instrument into the longitudinal opening of the sleeve and pushing on the shaft.

3. The bone screw of claim 1, further comprising a compressive device configured to resist proximal movement of the shaft, wherein the compressive device is located within the sleeve.

4. The bone screw of claim 3, wherein the shaft is configured such that pushing on the shaft causes the compressive device to expand and tension within the bone screw to increase.

5. The bone screw of claim 3, wherein contraction of the compressive device causes the first and second bone portions to compress.

6. The bone screw of claim 1, wherein the sleeve comprises a threaded ledge operable to engage a locking plate.

7. The bone screw of claim 1, wherein the bone screw is not cannulated.

8. A method for preparing a bone screw for insertion to a bone comprising:

inserting a driver into a longitudinal opening of a sleeve to contact a shaft, wherein the shaft includes a proximal and a distal end, wherein the proximal end comprises a gripping device, and the distal end is reciprocally received within the sleeve;

pushing the shaft at least partially out of a sleeve; and

extending a compressive device contained within the sleeve.

9. The method of claim 8, further comprising securing the bone screw within a locking plate.

10. The method of claim 9, further comprising mating threads with a threaded opening on the locking plate, wherein the sleeve comprises a ledge having the threads.

11. A bone screw for use in connection with a locking plate, the bone screw comprising:

a shaft having a proximal portion and a distal head component, wherein the distal end component is insertable through a first bone portion and attachable to a second bone portion;

a sleeve operable to receive the proximal portion of the shaft, the sleeve having a body and a smooth distal end, wherein the distal end is wider in diameter than the body; and

a set screw operable fit onto the distal end of the sleeve to secure the bone screw within a locking plate.

12. The bone screw of claim 11, wherein the locking plate comprises a hole having threads and a counter-bore.

13. The bone screw of claim 12, wherein the set screw comprises threads operable to mate with the threads in the hole of the locking plate to at least partially hold the bone screw in place.

14. The bone screw of claim 13, wherein the distal end of the sleeve operably mates with the counter-bore of the locking plate.

15. The bone screw of claim 14, wherein the hole of the locking plate is oriented at an angle to restrict movement of the bone screw to a desired trajectory.

16. The bone screw of claim 12, wherein the locking plate comprises a material selected from a group consisting of titanium, stainless steel, and titanium alloy.

17. The bone screw of claim 11, wherein the bone screw is cannulated.

18. The bone screw of claim 11, wherein the proximal portion of the shaft is threaded to facilitate engagement with a bone.

19. The bone screw of claim 11, wherein the locking plate comprises two holes, each of the two holes having a different angle of trajectory.

20. The bone screw of claim 11, wherein the proximal portion of the shaft comprises at least one of a gripping device, a tip, cutting threads, or fastening threads.