Endoscopic instruments having distally extending lever mechanism

Details Endoscopic instruments having distally extending lever mechanism Endoscopic instruments having distally extending lever mechanism

1993-07-13

1994-10-04

Thaler, Michael H.

Surgery

Instruments

Electrical application

606 52, 606205, A61B 1736

Patent

active

053522230

ABSTRACT:
An endoscopic surgical instrument includes a proximal handle with a distally extending lever actuator. The handle and lever actuator are coupled by a tube and push rod to a pair of distal end effectors. The proximal end of the tube is mounted in a bushing having a flange which is freely rotatable within a flange receiving recess in the handle. The proximal end of the push rod extends proximally beyond the bushing and is coupled to the lever actuator by a ball and set screw coupling. The lever actuator preferably extends at least four inches distally from the proximal end of the handle and includes a finger ring near its distal end. The tube is preferably provided with a ferrule immediately distal of the handle for rotating the tube and push rod about the longitudinal axis of the instrument. The ferrule is preferably provided with a distal extension having an annular notch for locking engagement inside another endoscopic instrument. The lever actuator imparts a force to the end effectors which is magnified relative to the force applied to the actuator. The distal extension of the lever actuator and the finger ring allow the instrument to be operated with one finger while the instrument is grasped by the ferrule or mounted inside another endoscopic instrument.

REFERENCES:
patent: 2685880 (1954-08-01), Curutchet
patent: 2790437 (1957-04-01), Moore
patent: 4644651 (1987-02-01), Jacobsen
patent: 5174300 (1992-12-01), Bales et al.
patent: 5184625 (1993-02-01), Cottone et al.
patent: 5242458 (1993-09-01), Bendel et al.

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