Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1979-04-16
1981-01-06
Michell, Robert W.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820518, A61M 1600
Patent
active
042430291
ABSTRACT:
A piston type air pump, for forced lung ventilation, with a variable length of stroke and a variable timing of inspiratory and expiratory phases. The pump includes a stepless change, variable radius crank arm, controllable during pump operation for changing the volume capacity of the pump. The drive motor is arranged for movement for varying the timing of piston in-movement to the piston out-movement for varying the time ratio of inspiration to expiration.
REFERENCES:
patent: 3033195 (1962-05-01), Gilroy et al.
patent: 3414896 (1968-12-01), Glick et al.
patent: 3523527 (1970-08-01), Foster
patent: 4011866 (1977-03-01), Klein et al.
patent: 4076021 (1978-02-01), Thompson
Law Richard D.
Michell Robert W.
Tayon Jeffrey W.
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