Self drilling bone screw

Details Self drilling bone screw Self drilling bone screw

2004-12-17

2010-10-26

Barrett, Thomas C (Department: 3775)

Surgery

Instruments

Orthopedic instrumentation

C606S312000, C606S318000

Reexamination Certificate

active

07819905

ABSTRACT:
A self-drilling bone screw includes a screw body centered on a longitudinal axis and having an external thread winding. The bone screw has a head portion at one end of the screw body and a drill point at the other end. The drill point has two blades, each having a cutting lip and a primary relief surface trailing from the cutting lip. The two blades defining a flute between them. The flute has an opening to the side of the screw body, which opening spans an obtuse angle, such as about 120°, about the longitudinal axis. The primary relief surfaces have a lip relief angle of about 30°. The drill point has a point angle of about 100°.

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patent: 5964766 (1999-10-01), Shaw
patent: 6508820 (2003-01-01), Bales

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