Endoscopic scissors instrument with cammed surface end effectors

Details Endoscopic scissors instrument with cammed surface end effectors Endoscopic scissors instrument with cammed surface end effectors

1992-10-09

1994-06-14

Cohen, Lee S.

Surgery

Instruments

Forceps

128751, A61B 1732

Patent

active

053206363

ABSTRACT:
An endoscopic surgical scissors instrument is provided with end effectors having arcuate cammed surfaces proximal their pivot points. The instrument includes a pair of scissor blades coupled to a pivot post such that at least one blade is pivotally movable with respect to the other from an open position to a closed position. The blades have inside cutting edges which engage each other in bearing contact as the blades are moved from the open to the closed position. In addition, each blade is bowed so as to effect a biasing of the cutting edges together in positions near the closed position. The arcuate cammed surface on the blades are located behind the pivot post, and the cammed surfaces push the blades apart behind the pivot post, thereby urging the cutting edges in front of the pivot post together in the open position of the blades. The cammed surfaces are arranged so that they exert a progressive biasing of the cutting edges together with the most biasing when the blades are in the open position and the least biasing when the blades are in the closed position. By requiring the cams to be arcuate, the cams contact each other in many locations as they slide over each other, thereby reducing wear and increasing stability.

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