Automatic tourniquet system
First Claim
Patent Images
1. An automatic tourniquet system comprising:
- variable pressure cuff means for applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat, tourniquet control signal generator, which is connected to the cuff means and which is operative to provide a first control signal operative to induce an initial tourniquet pressure in the cuff means higher than the minimum blood pressure required to maintain a bloodless field and subsequently to provide a second control signal operative to induce a tourniquet pressure lower than said initial tourniquet pressure in the cuff means and suitable for maintaining the bloodless field; and
control apparatus for determining an operative pressure of said variable pressure cuff means as the product of blood pressure and a factor and including means for monitoring the blood pressure of a patient, the operative pressure being included in at least one of said first and second control signals.
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Abstract
An automatic tourniquet system (10) including variable pressure cuff apparatus (60) for applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat and control apparatus (40) for determining the operative pressure of the variable pressure cuff (20) apparatus and including apparatus for estimating the minimum effective cuff pressure required for complete occlusion.
58 Citations
24 Claims
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1. An automatic tourniquet system comprising:
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variable pressure cuff means for applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat, tourniquet control signal generator, which is connected to the cuff means and which is operative to provide a first control signal operative to induce an initial tourniquet pressure in the cuff means higher than the minimum blood pressure required to maintain a bloodless field and subsequently to provide a second control signal operative to induce a tourniquet pressure lower than said initial tourniquet pressure in the cuff means and suitable for maintaining the bloodless field; and control apparatus for determining an operative pressure of said variable pressure cuff means as the product of blood pressure and a factor and including means for monitoring the blood pressure of a patient, the operative pressure being included in at least one of said first and second control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An automatic tourniquet method comprising the steps of:
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applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat by using variable pressure cuff means; providing a first control signal operative to induce an initial tourniquet pressure in the cuff means higher than the minimum blood pressure required to maintain a bloodless field and subsequently to provide a second control signal operative to induce a tourniquet pressure lower than said initial tourniquet pressure in the cuff means and suitable for maintaining the bloodless field; and determining an operative pressure of said variable pressure cuff means as the product of blood pressure and a factor, by monitoring the blood pressure of a patient, the operative pressure being included in at least one of said first and second control signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An automatic tourniquet method comprising the steps of:
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applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat by using variable pressure cuff means; providing a first control signal operative to induce an initial tourniquet pressure in the cuff means higher than the minimum blood pressure required to maintain a bloodless field and subsequently to provide a second control signal operative to induce a tourniquet pressure lower than said initial tourniquet pressure in the cuff means and suitable for maintaining the bloodless field; and automatically performing an IV regional anesthesia by using a proximal cuff and distal cuff and a cuff inflation/deflation device by the step of; controlling the cuff inflation/deflation device according to a proximal and distal inflation and deflation schedule, whereby the method operates automatically in accordance with a predetermined schedule. - View Dependent Claims (18, 19, 20, 21)
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22. An automatic tourniquet system in combination with an apparatus for automatically performing an IV regional anesthesia comprising:
- variable pressure cuff means for applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat including a proximal cuff and a distal cuff and a cuff inflation/deflation device, a double tourniquet cuff control unit for controlling the cuff inflation/deflation which is connected to the cuff means and which is operative to provide a first control signal operative to induce an initial tourniquet pressure in the proximal cuff higher than the minimum blood pressure required to maintain a bloodless field and subsequently to provide a second control signal operative to induce a tourniquet pressure lower than said initial tourniquet pressure in the proximal cuff and suitable for maintaining the bloodless field, said double cuff pressure control further being operative for controlling the proximal and distal cuff inflation/deflation device according to a predetermined schedule, whereby the apparatus operates automatically in accordance with a predetermined schedule.
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23. An automatic tourniquet method comprising the steps of:
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applying a variable pressure to a limb or artery of a patient in order to occlude blood flow thereat by using variable pressure cuff means; providing a first control signal operative to induce an initial tourniquet pressure in the cuff means higher than the minimum blood pressure required to maintain a bloodless field; providing a second control signal operative to induce a tourniquet pressure lower than the initial tourniquet pressure in the cuff means and that maintains the bloodless field; and maintaining the bloodless field for so long as a tourniquet is to be applied to the limb or artery for its intended purpose. - View Dependent Claims (24)
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Specification