04869717 is referenced by 305 patents and cites 10 patents.

The disposable trochar in the form of a gas insufflation needle having a removable rod and needle portion within an outer sheath is provided. The rod has a blunt end and is retractable during insertion so that the needle edge cuts through the abdominal wall. Once passing through the wall the rod extends so as to protect the bowel from the sharp needle. A gas port provided for introducing gas through the rod and out a side passageway near the blunt end. After the abdomen is extended, the rod and needle can be removed as unit from the sheath and thrown away and a suitable instrument introduced through an instrument port having a separable diaphragm. The gas can continue to be introduced around the instrument and into the abdomen while the instrument is in place. After the required medical procedures are completed, the instrument is removed. Then the sheath and associated parts are removed and thrown away.

Title
Gas insufflation needle with instrument port
Application Number
7/185532
Publication Number
4869717
Application Date
April 25, 1988
Publication Date
September 26, 1989
Inventor
Edwin L Adair
2800 S. University Blvd., Denver, 80210
CO, US
Agent
Fields Lewis Pittenger & Rost
IPC
A61M 5/32
View Original Source