Piston and cylinder unit as supply device for the respiratory ai

Details Piston and cylinder unit as supply device for the respiratory ai Piston and cylinder unit as supply device for the respiratory ai

1989-04-12

1990-05-15

Eickholt, Eugene H.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

A62B 2302

Patent

active

049248618

ABSTRACT:
A piston and cylinder unit provides a supply actuable by means of an actuation device for delivering respiratory air in a respiratory cycle of a respirator. Its piston is sealed with its cylinder by means of a pair of rolling membranes arranged symmetrically with regard to one another. The membranes separate the cylinder contents into an antechamber and a working chamber. The wear of the rolling membranes during the working strokes and especially during the starting is decreased by a clean rolling of the folds. Also a leakage control takes place even during operation and an immediate detection of leaks due to bending stress, aging or other influences is guaranteed. For this purpose an inner chamber which is enclosed by the two rolling membranes is under a pressure different from the pressure in the antechamber and the working chamber so that the highest pressure is on a concave inside of the folds.

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patent: 3651804 (1972-03-01), Spiller
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patent: 4340044 (1982-07-01), Levy
patent: 4472082 (1984-09-01), Kroling
patent: 4782831 (1988-11-01), Gallant
patent: 4836198 (1989-06-01), Gates

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