Surgery – Truss – Pad
Patent
1975-11-10
1977-03-08
Michell, Robert W.
Surgery
Truss
Pad
A61M 1600
Patent
active
040107612
ABSTRACT:
An improved respirator gas delivery means of the type having a pneumatically-actuated piston slidably mounted in a cylinder, and separated therefrom by a resilient seal, such as a rolling seal or a bellows. An initial flow of air used to actuate the piston is established prior to delivery of a desired volume of breathable gas to a patient. The piston has a valve seal attached to its lower side, cooperating with a valve seat at an exit port in the cylinder, and tending to close the exit port under the weight of the piston. The initial flow of actuating air supports the piston at an equilibrium position allowing the flow to escape through exit port, and prestressing the resilient seal to minimize errors in the delivered volume. Closure of an external exit port valve halts the exit of actuating air, and allows the piston to move upwardly immediately in response to the continued admission of actuating air. Alternative embodiments are disclosed in which the initial flow of actuating air is either a relatively small bleed flow, or the full actuating flow.
REFERENCES:
patent: 1780336 (1930-11-01), Canton
patent: 2702023 (1955-02-01), Seehoff
patent: 3156238 (1964-11-01), Bird et al.
patent: 3859996 (1975-01-01), Mizzy et al.
Michell Robert W.
Puritan-Bennett Corporation
Recla Henry J.
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