Surgical instrument
First Claim
1. In a surgical instrument of the type comprising coaxial inner and outer tubes having coacting cutting edges in a distal region, the inner tube being rotatably driven while the outer tube is stationary, and means to maintain fluid flow from the cutting region through the instrument, the improvement whereina limited segment of the side of each tube is open, said opening of each tube extending to the distal extremity of the side of said tube,and at least the portion of the end of each tube that corresponds with the respective opening in the side of the tube being open,whereby at a first position of rotation of the inner tube, body tissue can protrude through the end and side openings of said tubes into the volume of the inner tube,said tubes bounding said side openings defining initial tissue-penetrating sharp pointed portions located where the tubes first come together during rotation of said inner tube, said pointed portions located at the distal extremity of the sides of the tubes,and cutting edges extend from said initial tissue-penetrating pointed portions both transversely across the end of and longitudinally along the sides of the tubes,whereby following initiation of gripping and cutting at said pointed portions located inwardly on the tissue from an exposed edge of the tissue, cutting can proceed in two angular directions toward the exposed edge of the tissue to complete the cut.
3 Assignments
0 Petitions
Accused Products
Abstract
Remote-cutting instrument formed by an inner tube rotating within an outer tube, in which an initial cutting point where portions of the tubes first come together during a cutting cycle is defined at the distal extremity of the sides of the tubes and cutting edges extend from this initial point longitudinally along the sides of the tubes. The coacting side edges of the tubes diverge in the proximal direction. There are end cutting edges of circular form, defining cusp-shaped points.
231 Citations
12 Claims
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1. In a surgical instrument of the type comprising coaxial inner and outer tubes having coacting cutting edges in a distal region, the inner tube being rotatably driven while the outer tube is stationary, and means to maintain fluid flow from the cutting region through the instrument, the improvement wherein
a limited segment of the side of each tube is open, said opening of each tube extending to the distal extremity of the side of said tube, and at least the portion of the end of each tube that corresponds with the respective opening in the side of the tube being open, whereby at a first position of rotation of the inner tube, body tissue can protrude through the end and side openings of said tubes into the volume of the inner tube, said tubes bounding said side openings defining initial tissue-penetrating sharp pointed portions located where the tubes first come together during rotation of said inner tube, said pointed portions located at the distal extremity of the sides of the tubes, and cutting edges extend from said initial tissue-penetrating pointed portions both transversely across the end of and longitudinally along the sides of the tubes, whereby following initiation of gripping and cutting at said pointed portions located inwardly on the tissue from an exposed edge of the tissue, cutting can proceed in two angular directions toward the exposed edge of the tissue to complete the cut.
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2. In a surgical instrument of the type comprising coaxial inner and outer tubes having coacting cutting edges in a distal region, the inner tube being rotatably driven while the outer tube is stationary, and means to maintain fluid flow from the cutting region through the instrument, the improvement wherein
a limited segment of the side of each tube is open, said opening extending to the distal extremity of the side of said tube, and at least the portion of the end of each tube that corresponds with the respective opening in the side of the tube being open, whereby at a first position of rotation of the inner tube, body tissue can protrude through the end and side openings of said tubes into the volume of the inner tube, said tubes bounding said side opening defining initial tissue-penetrating sharp pointed portions located where the tubes first come together during rotation of said inner tube, said pointed portions located at the distal extremity of the sides of the tubes, and cutting edges extend from said initial tissue-penetrating pointed portions longitudinally along the sides of the tubes, whereby following initiation of gripping and cutting at said pointed portions located inwardly on the tissue from an exposed edge of the tissue, cutting can proceed proximally.
Specification