Bone Screw

Patent metadata

Field	Value
Publication number	US-2024065744-A1
Application number	US-202217823846-A
Country	US
Kind code	A1
Filing date	Aug 31, 2022
Priority date	Aug 31, 2022
Publication date	Feb 29, 2024
Grant date	—

Abstract

A medical screw, including: a first region comprising a constant diameter first root having a first diameter and a constant pitch multi-start thread; a second region forming a transition region; and a third region including a constant diameter root having the first diameter and a constant pitch thread, wherein the transition region is in between the first region and the second region and joins the first region with the second region, and wherein a lead of the constant pitch multi-start thread is different from a lead of the constant pitch thread.

First claim

What is claimed is:

1 . A medical screw, comprising:
a first region comprising a constant diameter first root having a first diameter and a constant pitch multi-start thread; a second region forming a transition region; and a third region including a constant diameter root having the first diameter and a constant pitch thread, wherein the transition region is in between the first region and the second region and joins the first region with the second region, and wherein a lead of the constant pitch multi-start thread is different from a lead of the constant pitch thread.

2 . The medical screw of claim 1 , further comprising a fourth region including a constant diameter root having a second diameter greater than the first diameter and a taper region and the constant pitch thread, wherein the transition region transitions from the first diameter for the third region to the second diameter of the fourth region.

3 . The medical screw of claim 2 , further comprising a driving feature on the fourth region.

4 . The medical screw of claim 1 , wherein the constant pitch multi-start thread is a double-start thread.

5 . The medical screw of claim 1 , wherein the constant pitch multi-start thread and the constant pitch thread have the same pitch.

6 . The medical screw of claim 1 , wherein the third region is single threaded.

7 . The medical screw of claim 1 , wherein the second region is a non-threaded region.

8 . The medical screw of claim 1 , wherein the second region includes a thread joining of one of the threads of the first region with the thread of the third region.

9 . The medical screw of claim 1 , further comprising a cutting tip on the first region.

10 . A medical screw, comprising:
a first region comprising a constant diameter root with a first diameter and a constant pitch thread; a second region comprising a constant diameter root with the first diameter and a variable thread pitch that joins continuously to the constant pitch thread; and a third region having a tapered root with a tapered diameter and a variable pitch thread that joins continuously to the variable pitch thread of the second region.

11 . The medical screw of claim 10 , further comprising a cutting tip on the first region.

12 . The medical screw of claim 10 , further comprising a driving feature on the third region.

13 . The medical screw of claim 10 , wherein the first region is a distal region and is adjacent the second region at one end thereof.

14 . The medical screw of claim 13 , wherein the third region is a proximal region and is adjacent the second region at the other end thereof.

15 . The medical screw of claim 13 , wherein a largest root diameter in the third region is greater than or equal to an outer diameter of the constant pitch thread in the first region.

16 . A medical screw, comprising:
a first region including a constant diameter root with a first diameter and a constant pitch thread; a second region including a constant diameter root with the first diameter and a first variable pitch thread; a third region including a constant diameter root with a second diameter and a second variable pitch thread; and a fourth region comprising a step between the second and third regions, wherein the second diameter is larger than the first diameter.

17 . The medical screw of claim 16 , wherein the step includes a cutting surface.

18 . The medical screw of claim 16 , wherein the step is threadless.

19 . The medical screw of claim 16 , wherein the constant pitch thread in the first region joins continuously with the first variable pitch thread in the second region.

20 . The medical screw of claim 16 , wherein the first region further includes a fourth region having a tapered root with a tapered diameter.

21 . The medical screw of claim 16 , wherein the constant pitch thread in the first region has an outer diameter less than an outer diameter of the first variable pitch thread in the second region.

22 . The medical screw of claim 16 , wherein an outer diameter of the constant pitch thread in the first region is less than or equal to the second diameter.

Assignees

• Depuy Synthes Products Inc

Inventors

• Chan Jason
• Murugesan Ganesan
• Ekbote Abhishek
• Muruganandarn Mani
• Dhilip Thiruppaithi
• Sivakurnar Anbazhagan

Classifications

• A61B17/8635 Primary

  Tips of screws · CPC title

• A61B17/863 Primary

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

• A61B17/8615

  at the central region of the screw head · CPC title

• A61B17/864

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

• A61B17/8645

  Headless screws, e.g. ligament interference screws · CPC title