Surgery – Truss – Pad
Patent
1982-01-05
1984-10-30
Thaler, Michael H.
Surgery
Truss
Pad
128682, A61B 1712
Patent
active
044794940
ABSTRACT:
A pneumatic tourniquet for maintaining occluded or restricted blood flow into a patient's limb includes an inflatable cuff, a pressurizing mechanism for pressurizing the cuff, a pressure relief mechanism for depressurizing the cuff, a blook pressure sensing mechanism for sensing the patient's systolic blood pressure and for producing a blood pressure output signal representative thereof, and a pressure regulator mechanism responsive to the blood pressure output signal for selectably activating the pressurizing mechanism and the pressure relief mechanism to maintain a substantially constant pressure difference between the cuff pressure and the patient's systolic blood pressure.
Thus, the cuff pressure may be varied "adaptively" in response to changes in the patient's intra-operative systolic blood pressure to pressurize the cuff close to the minimum level required to maintain a bloodless surgical field, thereby minimizing the risk of patient injury due to over-pressurization of the cuff.
REFERENCES:
patent: 4321929 (1982-03-01), Lemelson et al.
"Complications Of and Improvements In Pneumatic Tourniquets Used in Surgery", J. A. McEwen, Medical Instrumentation, 15:4, Jul.-Aug. 1981.
Thaler Michael H.
Western Clinical Engineering Ltd.
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