An adaptive surgical tourniquet comprises: an inflatable cuff for encircling a limb of a patient； pressurizing means for pressurizing the cuff； pressure relief means for depressurizing the cuff； cuff pressure sensing means for sensing cuff pressure； limb occlusion pressure sensing means for sensing the patient's initial limb occlusion pressure at a selected time； physiologic characteristic sensing means for sensing a physiologic characteristic of the patient； and pressure regulator means for establishing an adapted limb occlusion pressure that is a predetermined function of the initial limb occlusion pressure and the physiologic characteristic, wherein the pressure regulator means is operable after the initial limb occlusion pressure is sensed for selectably activating the pressurizing means and the pressure relief means to maintain the cuff pressure above the adapted limb occlusion pressure for a time period suitably long for the performance of a surgical procedure.
