Surgical resecting instrument
First Claim
1. A surgical resecting instrument comprising:
- a body part having a rotary driving means;
an insertable part adapted to be inserted into a tissue within a living body attached to and extending away from a front end part of said body part, said insertable part including a tubular outer member forming an outer shell of said insertable part and an inner tube provided internally of said tubular outer member and rotated and driven by said rotary driving means, said tubular outer member having an open tip part, said inner tube having a center of a tip surface which is V-shaped with an apex of said V-shaped tip surface extending toward a rear of said inner tube;
an outer blade of tubular form provided in said open tip part of said tubular outer member, said outer member having a slot in a sidewall thereof extending from said tip of said outer member toward said body part and said outer blade having a blade part formed at an edge of said slot;
an inner blade provided at a tip part of said inner tube within said outer blade for shearing a living body tissue together with said blade part of said outer blade, said inner blade having a shearing blade part formed so that an angle formed with said blade part of said outer blade, at the beginning of a shearing action, will be larger than the angle formed with said blade part of said outer blade as said shearing action continues and at least one of said shearing blade part of said inner blade and said blade part of said outer blade is formed as a circular arc.
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Abstract
A surgical resecting instrument whereby a cartilage, joint bump or tumor within a body cavity such as a joint cavity, for example, of a knee is resected from outside the body cavity without incising it and is discharged out of the body cavity has a body part providing a rotary driving connection and an insertable part to be inserted into a tissue within a living body attached to and extending from a front end part of the body part. The insertable part comprises a tubular outer tube opened in the tip part and forming an outer shell of the insertable part and an inner tube provided within the outer tube and rotated and driven by the rotary driving connection. An outer tubular blade is provided in the tip part of the outer tube. The tip of the outer blade is open and has a slot extending from the tip in a peripheral wall and forming a blade part at an edge of the slot. An inner blade for shearing a living body tissue together with the outer blade part is provided in the tip part of the inner tube within the outer blade. The inner blade has a shearing blade part formed so that the angle formed with the outer blade part at the beginning of a shearing action will be larger than the angle formed with the blade part as the shearing action continues.
78 Citations
7 Claims
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1. A surgical resecting instrument comprising:
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a body part having a rotary driving means; an insertable part adapted to be inserted into a tissue within a living body attached to and extending away from a front end part of said body part, said insertable part including a tubular outer member forming an outer shell of said insertable part and an inner tube provided internally of said tubular outer member and rotated and driven by said rotary driving means, said tubular outer member having an open tip part, said inner tube having a center of a tip surface which is V-shaped with an apex of said V-shaped tip surface extending toward a rear of said inner tube; an outer blade of tubular form provided in said open tip part of said tubular outer member, said outer member having a slot in a sidewall thereof extending from said tip of said outer member toward said body part and said outer blade having a blade part formed at an edge of said slot; an inner blade provided at a tip part of said inner tube within said outer blade for shearing a living body tissue together with said blade part of said outer blade, said inner blade having a shearing blade part formed so that an angle formed with said blade part of said outer blade, at the beginning of a shearing action, will be larger than the angle formed with said blade part of said outer blade as said shearing action continues and at least one of said shearing blade part of said inner blade and said blade part of said outer blade is formed as a circular arc. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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- Resources
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Current AssigneeOlympus Optical Corporation Limited (Olympus Corporation)
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Original AssigneeOlympus Optical Corporation Limited (Olympus Corporation)
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InventorsShimomura, Koji, Shibuya, Shozo
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Primary Examiner(s)Thaler, Michael H.
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Application NumberUS07/633,194Time in Patent Office540 DaysField of Search606/170, 606/171, 606/180, 606/159, 604/22US Class Current604/22CPC Class CodesA61B 17/32002 with continuously rotating,...
