Cutting instrument
First Claim
1. A cutting instrument, comprising:
- an outer member having an opening at least partially bounded by a sharp cutting edge; and
a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having a flat surface at a distal end of the helical knife, the helical knife having an edge configured to slice into tough, fibrous tissue, the edge of the helical knife extending through the opening such that, during use, the edge slices into tough, fibrous tissue to draw the tough, fibrous tissue proximally along the helical knife towards the sharp cutting edge, the helical knife edge being arranged relative to the cutting edge such that the edges align in a plane substantially perpendicular to a longitudinal axis of the instrument to create a shearing action therebetween.
2 Assignments
0 Petitions
Accused Products
Abstract
A cutting instrument includes an outer member having a cutting portion, and a helical knife coupled to the outer member for rotation relative to the outer member. At least a portion of the helical knife extends distally beyond the cutting portion. The instrument includes an inner member received within the outer member. The helical knife is at a distal end of the inner member. A method of cutting includes slicing into tissue with a helical knife to draw tissue proximally toward a cutting portion, and cutting the tissue with the cutting portion. The helical knife is provided on an inner member, and the cutting portion is provided on an outer member. Cut tissue is transported along a helical channel defined by the helical knife and aspirated through a hollow interior in the inner member.
-
Citations
58 Claims
-
1. A cutting instrument, comprising:
-
an outer member having an opening at least partially bounded by a sharp cutting edge; and a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having a flat surface at a distal end of the helical knife, the helical knife having an edge configured to slice into tough, fibrous tissue, the edge of the helical knife extending through the opening such that, during use, the edge slices into tough, fibrous tissue to draw the tough, fibrous tissue proximally along the helical knife towards the sharp cutting edge, the helical knife edge being arranged relative to the cutting edge such that the edges align in a plane substantially perpendicular to a longitudinal axis of the instrument to create a shearing action therebetween. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
12. The instrument of clalm 1 wherein the outer member tapers to the sharp cutting edge.
-
24. A cutting instrument, comprising:
-
an outer member having an opening at least partially bounded by a cuffing edge; and an inner member received in the outer member for rotation relative to the outer member, the inner member including a shaft having a helical knife defining a sharp, slicing edge, the helical knife having a flat surface at a distal end of the helical knife, the slicing edge having a V- shaped cross section perpendicular to a longitudinal extent of the slicing edge, wherein the cutting edge and the slicing edge are configured to interact to cut tissue. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
-
-
43. A cutting instrument comprising:
-
an outer member having an opening at least partially bounded by a sharp cutting edge; and a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having a flat surface at a distal end of the helical knife, the helical knife configured to slice into tough, fibrous tissue, to draw the sliced tough, fibrous tissue into the opening, and to shear the sliced tough, fibrous tissue that has been drawn into the opening between the helical knife and the sharp cutting edge, the helical knife being arranged relative to the cutting edge such that portions of the helical knife and the cutting edge align in a plane substantially perpendicular to a longitudinal axis of the instrument to create the shearing therebetween. - View Dependent Claims (44, 45, 46, 47, 48, 49)
-
-
50. A culling instrument, comprising:
-
an outer member having an opening at least partially bounded by a sharp cutting edge; a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having an edge configured to slice into tissue, the edge of the helical knife extending through the opening such that, during use, the edge slices into tissue to draw the tissue proximally along the helical knife towards the sharp cutting edge;
wherein the sharp cutting edge and the edge of the helical knife are configured to cut tissue therebetween by a shearing action; andan inner member received within the outer member, the helical knife being located at a distal portion of the inner member, the inner member having a wall defining a hollow interior, wherein the inner member defines an aspiration opening through the wall of the inner member to the hollow interior, the aspiration opening being located at a proximal portion of the helical knife,
-
-
51. A cutting instrument, comprising:
-
an outer member having an opening at least partially bounded by a sharp cutting edge; and a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having an edge configured to slice into tissue, the edge of the helical knife extending through the opening such that, during use, the edge slices into tissue to draw the tissue proximally along the helical knife towards the sharp cutting edge;
wherein the edge of the helical knife comprises a helical channel having a proximal end, a distal end, and a pitch, the pitch of the helical channel changing from the distal end to the proximal end. - View Dependent Claims (52)
-
-
53. A cutting instrument, comprising:
-
an outer member having an opening at least partially bounded by a cutting edge; and an inner member received in the outer member for rotation relative to the outer member, the inner member including a shaft having a helical knife defining a sharp, slicing edge, the helical knife having a flat surface at a distal end of the helical knife, the slicing edge having a V-shaped cross section perpendicular to a longitudinal extent of the slicing edge, wherein the slicing edge is configured to draw tissue proximally along the helical knife towards the culling edge. - View Dependent Claims (54, 55)
-
-
56. A cutting instrument comprising:
-
an outer member having an opening at least partially bounded by a sharp cutting edge; and a helical knife coupled to the outer member for rotation relative to the outer member, the helical knife having a flat surface at a distal end of the helical knife, the helical knife configured to draw tissue into the opening, and to shear the tissue that has been drawn into the opening between the helical knife and the sharp cutting edge, the helical knife being arranged relative to the cutting edge such tat portions of the helical knife and the cutting edge align in a plane substantially perpendicular to a longitudinal axis of the instrument to create the shearing therebetween. - View Dependent Claims (57, 58)
-
Specification