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US 4,539,976 AGranted
Endoscopic surgical instrument
OwnerJewett M. Sharpeinventor
Life of this patent
Estimating the term…
Abstract
An instrument for surgical procedures is provided which comprises a hollow cannula for slidably receiving a cylindrical scalpel member which is slotted at one end. One side of the slot is ground to produce a cutting edge. The cannula is provided on its exterior with elements for adjustably supporting an elongated optical device which extends substantially parallel to the cannula.
Claims7
An endoscopic surgical instrument comprising:
- a hollow cylindrical cannula;
- a first support element secured to said cannula adjacent one of its ends;
- a second support element secured to said cannula adjacent the other end of its ends;
- an elongated optical device retained in substantially parallel relationship with the cannula by said support elements;
- a scalpel member operatively related to said cannula, said scalpel member comprising a cylindrical element slidably received within the cannula, said cylindrical element having a substantially U-shaped slot at one end extending longitudinally thereof, one side of said slot being ground to produce a cutting edge;
- and
- said scalpel member further comprising:
- a shoulder located adjacent the opposite end of said cylindrical element, the distance between the shoulder and said cutting edge being greater than the length of the cannula whereby when said shoulder engages an end of the cannula, the cutting edge is exposed;
- and gripping means located on the opposite side of the shoulder from the slotted end of the cylindrical element.
6 more elements
Dependencies are inferred from the claim text.