04112932 is referenced by 244 patents and cites 2 patents.

A cannula for surgical use comprising a base member having a bore therethrough, a tubular member bounding the bore and extending outwardly from a first side of the base member, and a turret member connected to a second side of the base member and having first and second aperture therein, the turret member being movable relative to the base member to selectively place a selected aperture in or out of alignment with the bore to open or close a passageway through the instrument.

Title
Laparoscopic cannula
Application Number
5/771519
Publication Number
4112932
Application Date
February 24, 1977
Publication Date
September 12, 1978
Inventor
Robert D Chiulli
71 Cherry St., Somerville, 02143
MA, US
Agent
Scott R Foster
IPC
A61B 17/36
A61B 1/00
View Original Source