Endoscope insertion cannula assembly

Details Endoscope insertion cannula assembly Endoscope insertion cannula assembly

1983-10-24

1985-11-05

Grieb, William H.

Surgery

Truss

Perineal

A61B 106

Patent

active

045507155

ABSTRACT:
A cannula including a guide and a cam housing rotatably supported about the guide into which a trocar obtuator and an endoscopy instrument may be inserted. A tapered proximal surface of the guide and a cooperating pin on the instrument rotate the instrument into proper rotational alignment. An axial slot extending from the distal end of the taper and a cooperating axial slot in the cam housing are aligned so that as the pin continues to slide axially into the cannula, the pin will interfere with a cam surface projecting from the side of the cam housing wall to rotate the cam housing out of the way as the pin proceeds further down the slot until the pin drops behind the cam surface into a pin retaining area. Thus, the instrument may be easily slid into the cannula, and through the action of the cam housing and guide, is held in proper axial, rotational and sealing alignment.

REFERENCES:
patent: 1397732 (1921-11-01), Goodloe
patent: 1880551 (1932-10-01), Wappler
patent: 2584619 (1952-02-01), Rubens et al.
patent: 4188942 (1980-02-01), Fehlberg
patent: 4254762 (1981-03-01), Yoon

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