Adaptive pneumatic tourniquet
First Claim
1. A pneumatic tourniquet for employing the minimum safe pressure to occlude blood flow into a patient'"'"'s limb, comprising:
- an inflatable cuff;
pressurizing means for pressurizing said cuff;
pressure relief means for depressurizing said cuff;
cuff pressure sensing means for sensing said cuff pressure;
blood pressure sensing means for sensing the patient'"'"'s systolic blood pressure; and
pressure regulator means responsive to variations in said systolic blood pressure for selectably activating said pressurizing means and said pressure relief means to maintain the cuff pressure above said systolic blood pressure and to maintain a substantially constant pressure difference between said cuff pressure and said systolic blood pressure.
2 Assignments
0 Petitions
Accused Products
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.
-
Citations
17 Claims
-
1. A pneumatic tourniquet for employing the minimum safe pressure to occlude blood flow into a patient'"'"'s limb, comprising:
-
an inflatable cuff; pressurizing means for pressurizing said cuff; pressure relief means for depressurizing said cuff; cuff pressure sensing means for sensing said cuff pressure; blood pressure sensing means for sensing the patient'"'"'s systolic blood pressure; and pressure regulator means responsive to variations in said systolic blood pressure for selectably activating said pressurizing means and said pressure relief means to maintain the cuff pressure above said systolic blood pressure and to maintain a substantially constant pressure difference between said cuff pressure and said systolic blood pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification