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Tourniquet apparatus for measuring limb occlusion pressure

  • US 8,425,426 B2
  • Filed: 11/09/2007
  • Issued: 04/23/2013
  • Est. Priority Date: 11/09/2007
  • Status: Active Grant
First Claim
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1. Tourniquet apparatus for measuring a patient'"'"'s limb occlusion pressure comprising:

  • an inflatable tourniquet cuff for encircling a limb at a location and applying a cuff pressure to a limb of a patient;

    pressure sensing means for producing a cuff pressure signal indicative of a level of pressure in the cuff;

    pressure regulation means communicating with the cuff and responsive to the cuff pressure signal for regulating the pressure in the cuff near a reference pressure level;

    blood flow transducing means adapted for producing a blood flow signal indicative of blood flow past the cuff;

    physiologic characteristic sensing means for sensing a physiologic characteristic of the patient that is a measure of blood pressure;

    limb occlusion pressure means responsive to the blood flow signal and the cuff pressure signal and operable for producing a limb occlusion pressure value indicative of a lowest level of pressure in the cuff at which the blood flow is less than a minimum detection threshold and further operable for recording a first level of the physiologic characteristic corresponding to a time when the blood flow is less than the minimum detection threshold; and

    safety margin indicator means responsive to the reference pressure level for producing a safety margin value having a predetermined relationship to the reference pressure level, the limb occlusion pressure value, the recorded first level of the physiologic characteristic and to a second level of the physiologic characteristic.

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