Patent ID: 8403916
Filing Date: 2013-03-26
Classification: A61B

Abstract:
1. A medical instrument for use on a patient, comprising: a housing forming an external body of said instrument for manipulation by a user, said housing having a proximal end and a distal end, a tool mount at said distal end of said housing, said tool mount defining a mounting bore having a proximal end and a distal end; a motor having a drive shaft rotatable about a drive axis; a drive magnet fixed to said drive shaft of said motor such that rotation of said drive shaft rotates said drive magnet about said drive axis, wherein said motor, said drive shaft and said drive magnet are hermetically sealed within said housing; and at least one replaceable tool assembly detachably coupled relative to said drive magnet at said mounting bore of said tool mount, said mounting bore located outside said hermetic seal, said tool assembly formed as a separable unit from said housing and said tool mount, said tool assembly including, wherein rotation of said drive magnet by said motor induces, via magnetic forces between said drive magnet and said tool magnet, movement of said tool, and when said drive magnet is rotated, said tool holder remains stationary within said mounting bore of said tool mount.