Surgical cutting instrument
First Claim
Patent Images
1. A surgical cutting instrument comprising:
- a housing;
an elongated fixed cutting member having a proximal end and a distal end and fixed at said proximal end to said housing, an axially directed fixed cutting edge on said a distal end directed toward said proximal end, and a recess adjacent said fixed cutting edge;
an elongated moveable cutting member reciprocally mounted on said fixed cutting member and having a distal end and a proximal end, an axially extending moveable cutting edge formed on said distal end and extending away from said proximal end toward said fixed cutting edge, said moveable cutting member being movable into shearing engagement with said fixed cutting edge and having an axially directed passage therein defining an inlet opening in said distal end, said cutting edges of said fixed and moveable cutting members being inclined toward one another and so configured as to produce a concentrated initial shearing action and a continuing progressive shearing action on bone placed between said cutting edges and thereby produce a chip of bone for each reciprocation of said first cutting member, wherein each said chip is deposited in said recess and moved into said passage through said opening and moves rearward with each reciprocation; and
means on said housing for reciprocally moving said moveable cutting member with respect to said second cutting member in a first, forward direction and in a second, rearward direction.
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Accused Products
Abstract
A surgical cutting instrument having jaws formed on the distal ends of an outer and an inner cutting member. A recess in the inner cutting member is provided for collecting chips of material. A removable sheath over the outer cutting member permits removal of chips. The sheath also functions to prevent tissue damage. In an alternate embodiment, a collection chamber is provided for storing collected chips of material.
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Citations
19 Claims
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1. A surgical cutting instrument comprising:
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a housing; an elongated fixed cutting member having a proximal end and a distal end and fixed at said proximal end to said housing, an axially directed fixed cutting edge on said a distal end directed toward said proximal end, and a recess adjacent said fixed cutting edge; an elongated moveable cutting member reciprocally mounted on said fixed cutting member and having a distal end and a proximal end, an axially extending moveable cutting edge formed on said distal end and extending away from said proximal end toward said fixed cutting edge, said moveable cutting member being movable into shearing engagement with said fixed cutting edge and having an axially directed passage therein defining an inlet opening in said distal end, said cutting edges of said fixed and moveable cutting members being inclined toward one another and so configured as to produce a concentrated initial shearing action and a continuing progressive shearing action on bone placed between said cutting edges and thereby produce a chip of bone for each reciprocation of said first cutting member, wherein each said chip is deposited in said recess and moved into said passage through said opening and moves rearward with each reciprocation; and means on said housing for reciprocally moving said moveable cutting member with respect to said second cutting member in a first, forward direction and in a second, rearward direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19)
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13. A surgical cutting instrument comprising:
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a housing; an elongated fixed cutting member having proximal and distal ends and fixed at said proximal end to said housing, an axially directed fixed cutting edge on said a distal end directed toward said proximal end, and a recess adjacent said fixed cutting edge; an elongated moveable tubular cutting member reciprocally mounted on said fixed cutting member and having distal and proximal ends, an axially extending moveable cutting edge formed on said distal end and extending away from said proximal end toward said fixed cutting edge, said moveable cutting member being movable into shearing engagement with said fixed cutting edge and having an axially directed passage therein defining an inlet opening in said distal end, said cutting edges of said fixed and moveable cutting members being angled toward one another and so configured as to initially overlap at a center portion to produce an initial concentrated shearing action and a continuing progressive shearing action on bone placed between said cutting edges to produce a chip of bone for each reciprocation of said first cutting member, wherein each said chip is deposited in said recess and moved into said passage through said opening and moves rearward with each reciprocation; and means on said housing for reciprocally moving said moveable cutting member with respect to said second cutting member in a first, forward direction and in a second, rearward direction.
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Specification