초록

A microsurgical cutting instrument is disclosed which is provided with a cutting probe assembly wherein the inner and outer cutting members thereof are swaged and the inner cutting member is bent towards the outer cutting member, so as to maintain a preselected relationship of the cutting edges.

대표청구항 ▼

A cutting probe assembly for use with a surgical cutting instrument of the type having a handpiece assembly, the handpiece assembly including means for effecting reciprocation of said probe assembly; said cutting probe assembly allowing aspiration of body tissue therethrough and being adapted to be

A cutting probe assembly for use with a surgical cutting instrument of the type having a handpiece assembly, the handpiece assembly including means for effecting reciprocation of said probe assembly; said cutting probe assembly allowing aspiration of body tissue therethrough and being adapted to be attached to said handpiece assembly; said probe assembly comprising outer and inner cutting assemblies; said outer cutting assembly including an outer tubular cutting member fixedly attached at a proximal end to said handpiece assembly and having a distal end portion defining a cutting port through which body tissue is aspirated, said outer tubular member having a cutting edge; said inner cutting assembly including an inner tubular cutting member disposed inside of and continuously spaced along its entire length from said outer tubular cutting member; said inner cutting member connected to the reciprocating means for reciprocating movement relative to and within said outer cutting member; said inner cutting member having a distal end portion with a cutting edge formed thereon, said end portion of said inner member is angularly inclined relative to a longitudinal axis of said inner cutting member and is sized, shaped and inclined so as to maintain a preselected relationship with said cutting edge of said outer cutting member, said cutting edge of said inner member being resiliently maintained in the preselected relationship to cooperate with said cutting edge of said outer member to effect cutting of tissue aspirated through said port as said inner and outer cutting members are reciprocated with respect to each other; said port has a radius which is generally equal to an outer radius of said outer cutting member so as to improve the cutting action; the preselected relationship between said inner and outer cutting members defines a clearance therebetween; and said inner cutting member has a relief surface formed which extends along the entire length of said distal end portion from a junction of said end portion and an adjacent portion of said inner cutting member, said relief surface being on a surface remote from said port.