Dental tool with shear pin handle - Pending Dental Patent Applications

Dental tool with shear pin handle
USPTO Patent Full-Text and Database
Walton, James
US Patent Application: 20040214137
Publication Date: October 28, 2004
Kind Code: A1
Inventors: Walton, James; (West Palm Beach, FL)
Correspondence Name and Address: Michael A. Slavin
McHale & Slavin, P.A.
Suite 402
4440 PGA Boulevard
Palm Beach Gardens
FL
33410
US
Serial No.: 423799
Series Code: 10
Filed: April 25, 2003
U.S. Current Class: 433/141; 81/471; 81/481
U.S. Class at Publication: 433/141; 081/471; 081/481
Intern'l Class: A61C 003/00; B25B 023/153
Abstract:
A tool is used to limit the torque applied to tighten the threaded connection of prosthesis components placed in skeletal bones, for example dental implants. The device has a handle, a retaining screw, a single use torque limiting shear pin and a drive shaft. The handle has a tapered counter sunk cross bore with left handed threads to allow installation of a drive shaft which engages a torque limiting shear pin which, in turn, engages a left hand threaded retaining screw. The drive shaft extends from the handle to engage any threaded fastener that has a head that corresponds to the drive shaft end. The drive shaft and the shear zone of the shear pin are completely isolated within the wrench handle so that all rotational force is utilized in the actual shearing of the shear pin to a torque accuracy of .+-.0.3 Mcm, approximately.