Personalized tourniquet system having dual-purpose cuff
First Claim
1. A method for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP), comprising the steps of:
- estimating a limb occlusion pressure (LOP) by determining a minimum pressure at which penetration of blood past an applied tourniquet cuff is stopped;
measuring a pulsation characteristic associated with the LOP;
establishing a PTP by determining a second pressure that is greater than the LOP and that corresponds to a second pulsation characteristic that differs by a predetermined percentage from the pulsation characteristic associated with the LOP; and
during a surgical time period, maintaining pressure in the applied tourniquet cuff near the PTP.
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Accused Products
Abstract
Disclosed is a method and apparatus for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP) to facilitate safe performance of a surgical procedure. The apparatus includes a dual-purpose tourniquet cuff adapted to encircle a region of a patient limb to provide both a sensor during a pre-surgical time period and an effector during a surgical time period. An effector module communicates pneumatically with an inflatable bladder of the cuff for maintaining pressure in the bladder near a PTP during the surgical time period to safely stop penetration of arterial blood past the cuff. A pulsation sensor that communicates pneumatically with the inflatable bladder during the pre-surgical time period senses and characterizes pressure pulsations that are indicative of penetration of arterial blood into the region of the limb encircled by the cuff. A PTP estimator is responsive to the pulsation sensor for producing an estimate of the PTP, such that the estimate of the PTP is a function of the sensed pulsations.
35 Citations
23 Claims
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1. A method for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP), comprising the steps of:
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estimating a limb occlusion pressure (LOP) by determining a minimum pressure at which penetration of blood past an applied tourniquet cuff is stopped; measuring a pulsation characteristic associated with the LOP; establishing a PTP by determining a second pressure that is greater than the LOP and that corresponds to a second pulsation characteristic that differs by a predetermined percentage from the pulsation characteristic associated with the LOP; and during a surgical time period, maintaining pressure in the applied tourniquet cuff near the PTP. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP), comprising the steps of:
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during a pre-surgical time period; estimating a limb occlusion pressure (LOP) by determining a minimum pressure at which penetration of blood past an applied tourniquet cuff is stopped, measuring a pulsation characteristic associated with the LOP, establishing a PTP by determining a second pressure that is greater than the LOP and that corresponds to a second pulsation characteristic that differs by a predetermined percentage from the pulsation characteristic associated with the LOP; and during a surgical time period, regulating the cuff pressure to maintain a surgical pulsation characteristic near the second pulsation characteristic. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for regulating tourniquet cuff pressure based on a personalized tourniquet pressure (PTP), comprising the steps of:
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applying a surgical tourniquet cuff having a bladder to a patient'"'"'s limb at a location proximal to a surgical site on the limb; during a pre-surgical time period; estimating a minimum pressure at which penetration of blood past the applied tourniquet cuff is stopped by analyzing pressure pulsations in the bladder of the cuff that are associated with selected pressures in the bladder, thereby to identify a limb occlusion pressure (LOP) at the location; establishing a PTP by determining a second pressure that is greater than the LOP and that corresponds to a second pulsation characteristic that differs by a percentage from the pulsation characteristic associated with the LOP; and during a surgical time period maintaining pressure in the bladder of the applied tourniquet cuff near the PTP. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification