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Snyder Laboratories, Inc.

Edward P Todd

Eugene E Weilbacher

A modular drainage apparatus has a plurality of preformed plastic bodies supported by a header. One of the bodies includes a collection chamber connected to the pleural cavity of a patient and connected to a first passage formed in the header. A second body includes a U-shaped liquid seal chamber having one end connected to the first passage and its other end connected to a second passage formed in the header. The second passage is connected to a vacuum pump, which creates a suction within the collection chamber through the liquid seal chamber. A third body includes a U-shaped chamber to regulate the negative pressure produced by the vacuum pump to a desired negative pressure. The second body also includes a second U-shaped chamber having one end connected to the atmosphere and its other end connected to the liquid seal chamber adjacent its connection to the first passage. By filling each leg of the second U-shaped chamber of the second body to a selected level with a liquid, the negative pressure in the collection chamber is maintained at a selected maximum above the pressure maintained in the collection chamber by the vacuum pump and regulated by the U-shaped chamber of the third body.

Modular drainage apparatus having excess negativity control

A drainage apparatus has a collection chamber connected to the pleural cavity of a patient with a vacuum pump connected through a water seal chamber to the collection chamber. A pressure regulating chamber maintains the negative pressure created by the vacuum pump in the water seal chamber at a desired negative pressure. When there is an increase in negative pressure within the pleural cavity of the patient, atmospheric pressure is transmitted through a liquid at a selected level in an excess negativity chamber to the collection chamber to reduce the negative pressure in the collection chamber and the pleural cavity of the patient connected thereto to a selected maximum above the negative pressure maintained in the collection chamber by the vacuum pump and regulated by the pressure regulating chamber.

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Lexington, KY, United States of America

Edward P Todd