Cannula lock and seal mechanism

Details Cannula lock and seal mechanism Cannula lock and seal mechanism

1997-06-23

1999-07-06

Stright, Jr., Ronald

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604240, 604533, A61M 500

Patent

active

059191694

ABSTRACT:
An attachment is described whereby a cannula or needle can be connected to a syringe or vacuum-creating machine in a quick and reliable manner. The cannula attachment comprises a plug which rigidly connects to the cannula at a tip using welding or other mounting methods, such that the plug can communicate fluid into and out of the cannula. The plug includes external threads about a middle portion, and a frustro-conical nose is formed at the opposite end. The nose is sized to fit snugly into the port of the syringe or vacuum-creating device at some intermediate distance between the tip and the end of the nose. With the nose tightly in the syringe port, a channel is formed through the plug from the cannula to the syringe barrel. The attachment is held in place by a locking sleeve which receives the syringe's port and the plug within opposite ends of a longitudinal bore such that the nose projects loosely into the syringe port. Internal threads at a first end of said sleeve engage the external threads of the plug as the plug is rotated, and the engagement of the threads draw the plug increasingly farther into the locking sleeve. When the plug is substantially rotated into the locking sleeve, the nose will be lodged in the syringe port sufficiently to compress the port between the locking sleeve and the nose. An air-tight and fluid-tight seal can be achieved quickly and reliably using the above-described attachment assembly while protecting against premature decoupling due to forces transferred to the connection.

REFERENCES:
patent: 1668315 (1928-05-01), Hein
patent: 3402713 (1968-09-01), Senkowski et al.
patent: 3542024 (1970-11-01), Burke
patent: 5002538 (1991-03-01), Johnson
patent: 5385555 (1995-01-01), Hausser
patent: 5419775 (1995-05-01), Haffner et al.
patent: 5433711 (1995-07-01), Balaban et al.
patent: 5456675 (1995-10-01), Wolbring et al.

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