Surgery – Truss – Pad
Patent
1975-05-21
1976-06-29
Michell, Robert W.
Surgery
Truss
Pad
128 28, A61M 1600
Patent
active
039658937
ABSTRACT:
The appliance serves to subject a human patient to artificial respiration. A cushion is adapted to be disposed under the back of the patient. A piston-cylinder actuator is carried by a fixed support. An inlet valve is connected between a source of an inhalable gas under superatmospheric pressure and said actuator and is adapted to admit inhalable gas from said source to said actuator on one side of said piston. An outlet valve is connected between said actuator and a reservoir which is adapted to expand in response to its internal pressure. Said outlet valve is adapted to release inhalable gas from said actuator on said one side of said piston into said reservoir. A conduit which incorporates a shut-off valve connects said reservoir to said respiration mask. First spring means oppose a movement of said piston under the influence of said inhalable gas admitted to said actuator from said source. Second spring means oppose the expansion of said reservoir. A ram is mounted to be adjustable relative to said support into engagement with the chest of said patient and is connected to said piston to be forced against the chest of said patient by the movement of said piston under the influence of said inhalable gas admitted to said piston from said source. A stop is arranged to limit the movement of said piston under the influence of said inhalable gas admitted to said actuator from said source. An adjusting mechanism is arranged to positively adjust said stop in response to the adjustment of said ram relative to said support into engagement with said chest, whereby said stop is moved to a position in which said stop limits said movement of said piston to an extent that depends on the diameter of said chest.
REFERENCES:
patent: 3254645 (1966-06-01), Rand et al.
patent: 3336920 (1967-08-01), Thomas
patent: 3348536 (1967-10-01), Tambascia
patent: 3351092 (1967-11-01), Ingerfield et al.
patent: 3509899 (1970-05-01), Hewson
Kelman Kurt
Michell Robert W.
Recla Henry J.
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