Surgery – Truss – Pad
Patent
1975-03-10
1976-08-24
Michell, Robert W.
Surgery
Truss
Pad
A61M 1600
Patent
active
039760650
ABSTRACT:
A single fluidic flipflop serves as the primary control element in a respiratory ventilator, the flipflop selectively controlling an interface valve to intermittently interrupt the flow of gas from a source to the lungs of a patient through a flow line. In a pressure-limited embodiment positive and negative pressures in the flow line control the flipflop whereas in a volume limited embodiment a negative pressure provides one control for the flipflop and the second control is digitally derived from the volume of gas flowing to the patient. The ventilator is operable in the assist, control and intermittent mandatory ventilation modes. It may operate as an intermittent positive pressure breathing device or a positive end expiratory pressure device, depending upon a manually adjustable bias signal applied to the flipflop. Provision is made for both a manual and an automatic sigh control, and for selectively inflating an endotracheal cuff.
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patent: 3537449 (1970-11-01), Foxwell et al.
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Ball et al., Fourth Cranfield Fluidics Conference, Mar. 17-20, 1970, Coventry, pp. 13-24.
Belforte, Fourth Cranfield Fluidics Conference, Mar. 17-20, 1970, Coventry, pp. 1-12.
Michell Robert W.
Recla Henry J.
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