Bone screw
AssigneeDePuy Synthes Products, Inc.
InventorsJason Chan, Ganesan Murugesan, Abhishek Ekbote, Muruganandarn Mani, Dhilip Thiruppathi, Sivakumar Anbazhagan
Life of this patent
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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.
Claims6
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;
- wherein the second region comprises more than one turn of the thread with a variable thread pitch;
- wherein the screw is a single threaded screw.
Dependencies are inferred from the claim text.