Surgical instrument and method of making same

摘要

A surgical instrument, with method and apparata for making same. A pair of coaxial tubular members include cooperating oval openings the formations of which are developed by the apparata and method. One apparatus comprises a fixture for supporting the inner or blade member in a spindle having a follower, and a cam assembly and registry means for mounting to the fixture. The cam assembly is mounted to the fixture and through cooperative action with the follower directs movement of blade member and spindle during grinding formation of a blade's thickness including a positive cutting angle across its wall. The registry means comprises a body mountable to the cam assembly and having a pin which properly seats an initially formed opening in the blade member exteriorly of the cam assembly for subsequent grinding thereon. A second apparatus provides for the initial formation of both openings after which the first apparatus operates to finish the blade member's body formation for its opening. The methods of forming these openings also are unique.