SURGICAL CHISEL TOOL AND METHOD

摘要

A surgical chisel tool is provided which includes a housing (10) having a cylinder (32) with a piston (34) which is propelled by compressed gas. A chisel bit assembly (18) is mounted to the tool for sliding movement so that depressing the tool against the work urges the chisel bit assembly (18) to project into the cylinder (32) a distance for striking by the piston (34). The piston (34) is propelled by the introduction of compressed gas and is decelerated as it approaches the chisel assembly (18) to strike it with a force dependent upon the distance the bit assembly (18) projects into the cylinder (32). A selector valve assembly (16) is also provided to enable the tool to be operated in a single shot or reciprocating fashion. Chisel bits (22) are provided and are configured to act to limit their penetration during use.