Surgical instrument
First Claim
1. A surgical instrument for cutting body tissue, comprising:
- an elongate support shaft;
a tip assembly attached to a distal end of the support shaft, said tip assembly comprising a stationary portion and a movable portion, a distal end of said movable portion being pivotally connected to a distal end of the stationary portion so as to form a cutting jaw; and
means extending coaxially with the support shaft for applying closing and opening forces to the movable portion of the cutting jaw;
wherein said stationary portion comprises a first cutting edge extending substantially parallel to and laterally adjacent a central longitudinal axis of the support shaft, and a second cutting edge extending substantially parallel to the first cutting edge, and a third cutting edge extending from a proximal end of said first cutting edge to a proximal end of said second cutting edge; and
wherein said movable portion comprises first, second and third cutting edges which cooperate, respectively, with the first, second and third cutting edges of the stationary portion.
9 Assignments
0 Petitions
Accused Products
Abstract
A surgical instrument has an elongate support shaft, a tip assembly permanently attached to the shaft, a cutting jaw which opens in a backward facing direction and which is laterally offset from the longitudinal axis of the support shaft, and a rod extending coaxially with the elongate support shaft for applying closing and opening forces to the cutting jaw. The tip assembly comprises a stationary portion and a movable portion having respective tissue cutting edges which define the cutting jaw. The stationary portion of the tip assembly is permanently attached to the distal end of the support shaft, and the movable portion of the tip assembly is pivotally attached to a distal end of the stationary portion. The stationary portion of the tip assembly has a plurality of cutting edges which define an opening which extends axially adjacent the longitudinal axis of the support shaft. The movable portion has corresponding cutting edges which cooperate with the cutting edges of the stationary portion to define the cutting jaw. The cutting jaw has a fully open position in which the movable element extends outwardly from the longitudinal axis and toward a proximal end of the elongate shaft at an angle of approximately 60°. The cutting jaw has a fully closed position in which the cutting element is disposed within the opening in the stationary portion of the tip assembly. The tip assembly has an overall height dimension, when the cutting element is in the fully closed position, which is substantially equal to a corresponding cross-sectional dimension of the elongate support shaft.
223 Citations
18 Claims
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1. A surgical instrument for cutting body tissue, comprising:
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an elongate support shaft; a tip assembly attached to a distal end of the support shaft, said tip assembly comprising a stationary portion and a movable portion, a distal end of said movable portion being pivotally connected to a distal end of the stationary portion so as to form a cutting jaw; and means extending coaxially with the support shaft for applying closing and opening forces to the movable portion of the cutting jaw; wherein said stationary portion comprises a first cutting edge extending substantially parallel to and laterally adjacent a central longitudinal axis of the support shaft, and a second cutting edge extending substantially parallel to the first cutting edge, and a third cutting edge extending from a proximal end of said first cutting edge to a proximal end of said second cutting edge; and wherein said movable portion comprises first, second and third cutting edges which cooperate, respectively, with the first, second and third cutting edges of the stationary portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A surgical instrument for cutting body tissue, comprising:
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a support shaft having a longitudinal axis; a tip assembly attached to a distal end of the support shaft, said tip assembly comprising a stationary portion and a movable portion, said stationary portion having a pair of opposing sidewalls; a pivot pin connecting a distal end of the movable portion between distal ends of the opposing sidewalls of the stationary portion so as to form a cutting jaw; and an elongate member extending coaxially with the support shaft and pivotally connected to the movable portion of the tip assembly for applying closing and opening forces to the movable portion of the cutting jaw; wherein said stationary and movable portions comprise a plurality of cooperating cutting edges disposed between substantially parallel planes which extend substantially transversely through the pivot pin at the distal ends of the opposing sidewalls. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification