Importance

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Abstract

A device for evacuating body fluids under sub-atmospheric pressure is disclosed using a suction device in which a constant force means is utilized to create substantially constant vacuum in a chamber of the suction device, and the device progressively fills with fluid drawn thereinto through a catheter or the like. The device includes an elongated cylindrical chamber with a movable piston therein and with peripheral seal means on the side wall of the piston to seal against the inner wall of the elongated cylindrical chamber to provide a seal thereat. An intake means to the cylindrical chamber is provided with a check valve therein which provides for only a unidirectional flow of fluid through the intake means. A substantially constant force producing coil ribbon spring is secured to the piston and adapted to bias the piston in a direction to cause flow of body fluids from the patient and through the check valve to the interior of the cylindrical chamber, without danger of retroflow from the cylindrical chamber back to the patient through the conduit from the patient.

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First Claim