Verres needle system and method

Details Verres needle system and method Verres needle system and method

1993-11-12

1995-06-06

Yasko, John D.

Surgery

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

Gas application

128747, 128748, A61M 1300

Patent

active

054218217

ABSTRACT:
A verres needle system and method having a tube with an open distal end shaped for insertion through tissue into a body cavity, and a obturator slidably disposed within the tube and being resiliently biased to protrude from the distal end of the tube, and a negative pressure sensor positioned to detect negative pressure at a proximal end of the needle. The negative pressure sensor is connected to a circuit that the sensor closes a switch to eliminate a light when the pressure within the tube in obturator reaches a predetermined value, which indicates that the tip of the needle and obturator are positioned within a body cavity as supposed to body tissue or an organ. The method of utilizing the needle system is to insert the needle into the body cavity while at the same time pulling the tissues surrounding the body cavity away from the cavity to create the negative pressure, which is detected by the pressure sensor and circuit when the tip is properly positioned within the cavity.

REFERENCES:
patent: 3982533 (1976-09-01), Wiest
patent: 4356826 (1982-11-01), Kubota
patent: 4464169 (1984-08-01), Semm
patent: 4869717 (1989-09-01), Adair
patent: 4874362 (1989-10-01), Wiest et al.
patent: 5013294 (1991-05-01), Baier
patent: 5139478 (1992-08-01), Koninckx et al.
patent: 5209721 (1993-05-01), Wilk

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