Trocar and tube with pressure signal

Details Trocar and tube with pressure signal Trocar and tube with pressure signal

1992-07-02

1994-01-18

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604164, 128748, A61M 500

Patent

active

052795675

ABSTRACT:
An apparatus for inserting a thoracotomy tube in a patient without damaging adjacent lung tissues is provided. The thoracotomy tube is adapted to receive a trocar having screw threads on the distal end thereof. The proximal end of the trocar has a handle thereon to rotate the trocar so that the screw threaded distal end forms an incision within the skin of the patient and the tip end of the screw thread passes into the pleural cavity. The distal end of the thoracotomy tube is provided with screw threads on the outer surface thereof to form a continuation of the screw threads of the trocar. The distal tip or end of the trocar terminates in a short flexible tube. A hollow needle extends through a central passageway in the trocar and through the flexible tip on the trocar. The opposite end of the hollow needle is provided with a pressure chamber which is in fluid communication with the passageway in the needle. In use, the trocar and thoracotomy tube are screwed into the body tissues of the patient and when the distal end of the needle enters the pleural cavity within the body, liquid within the pressure chamber passes through the hollow needle and into the pleural cavity. The release of the fluid from the pressure chamber is an indicator to the surgeon that the end portion of the needle has entered the pleural space. The trocar and thoracotomy tube are then screwed in as the needle is withdrawn from the flexible tip on the distal end of the trocar so as to prevent damage to any body tissues.

REFERENCES:
patent: 2922426 (1960-01-01), Cheng
patent: 4191191 (1980-03-01), Auburn
patent: 4810244 (1989-03-01), Allen
patent: 5009643 (1991-04-01), Reich et al.
patent: 5147376 (1992-07-01), Pianetti
patent: 5188594 (1993-02-01), Zilberstein

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