04655752 is referenced by 337 patents and cites 4 patents.

A surgical cannula having a first seal member having a substantially conical shape and an opening at the tip thereof, and a second seal member having a substantially conical shape and a slit at the tip thereof, whereby (a) when an instrument is inserted into the cannula, the instrument can pass through the first and second seal members into proximity with a surgical site located beneath the cannula, and fluid entering the cannula from the site will force the first seal member to close around the instrument and form a tight seal therewith so as to prohibit fluid from passing out of the cannula and (b) when no instrument is inserted into the cannula, fluid entering the cannula from the site will force the conical second seal member to close tightly on its slit and thereby form a tight seal so as to prohibit fluid from passing out of the cannula.

Title
Surgical cannula
Application Number
544552
Publication Number
4655752
Application Date
April 7, 1986
Publication Date
April 7, 1987
Inventor
Philip R Lichtman
Newton
MA, US
John C Strahan
Arlington
MA, US
George P Honkanen
N. Scituate
MA, US
Agent
Schiller Pandiscio & Kusmer
Assignee
Acufex Microsurgical
MA, US
IPC
A61M 5/00
View Original Source