Surgery – Truss – Perineal
Patent
1974-08-09
1976-06-08
Howell, Kyle L.
Surgery
Truss
Perineal
1281458, A61B 508
Patent
active
039616240
ABSTRACT:
A method for determining the maximum and minimum lung pressure during the breathing cycle of a patient undergoing positive pressure breathing therapy by utilizing a respiration system which includes a console with a gas supply and control unit located at a substantial distance from the patient, and a transfer unit in proximity to the patient. The delivery hose from the transfer unit to the patient is very short and of relatively small volume, so that a pressure sensor located in the transfer unit can monitor the system pressure at a point which has a relatively low volume spacial separation from the patient's lungs. In accordance with the method, a pressure versus time characteristic is generated from the sensed pressure, and the maximum and minimum lung pressures during each breathing cycle are determined from the characteristic by the pressure ordinates of readily identifiable discontinuities in the slope of the characteristic, the discontinuities being reliably indicative of the maximum and minimum lung pressures.
REFERENCES:
patent: 3410264 (1968-11-01), Frederik
patent: 3621835 (1971-11-01), Suzuki et al.
patent: 3756229 (1973-09-01), Ollivier
patent: 3848591 (1974-11-01), Smythe et al.
Journ. of Assoc. For Advanc. of Med. Instr., vol. 6, No. 1, Jan.-Feb., 1972, pp. 65-69.
Howell Kyle L.
Puritan-Bennett Corporation
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