INTERNAL TOURNIQUET FOR SURGERY
First Claim
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1. An internal tourniquet for establishing hemostasis within a portion of a limb to facilitate surgery comprising:
- fluid delivery means adapted to facilitate flow of a fluid into a capsule surrounding the limb portion;
blood sensing means for sensing a concentration of blood in the fluid within the capsule; and
pressure regulation means responsive to the sensed blood concentration to control the fluid delivery means to regulate the concentration of blood in the fluid in the capsule, and to maintain fluid pressure in the capsule within a pressure tolerance window.
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Abstract
An internal tourniquet for establishing hemostasis within a portion of a limb to facilitate surgery controls flow of a fluid into a capsule surrounding substantially all of a human joint. Blood concentration in the capsule is sensed; and pressure in the capsule is controlled to maintain a fluid pressure in the capsule within a predetermined pressure tolerance window. The concentration of blood in the capsule is maintained below a predetermined maximum concentration while the fluid pressure is within the pressure tolerance window.
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Citations
20 Claims
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1. An internal tourniquet for establishing hemostasis within a portion of a limb to facilitate surgery comprising:
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fluid delivery means adapted to facilitate flow of a fluid into a capsule surrounding the limb portion;
blood sensing means for sensing a concentration of blood in the fluid within the capsule; and
pressure regulation means responsive to the sensed blood concentration to control the fluid delivery means to regulate the concentration of blood in the fluid in the capsule, and to maintain fluid pressure in the capsule within a pressure tolerance window. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An internal tourniquet comprising:
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fluid delivery means adapted to facilitate flow of a fluid into a region near a human joint;
blood sensing means for sensing a concentration of blood in the fluid in the region and for producing a blood signal indicative of the concentration; and
pressure regulation means adapted for controlling the fluid delivery means to maintain a fluid pressure in the region within a pressure tolerance window over a time period suitably long for the performance of a surgical procedure, wherein the pressure regulation means is further responsive to the blood signal for further controlling the fluid delivery means to maintain the concentration of blood below a predetermined maximum concentration when the fluid pressure is within the pressure tolerance window. - View Dependent Claims (8, 9, 10, 11)
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12. An internal tourniquet comprising:
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fluid inflow means adapted to facilitate flow of a fluid into a surgical region near a human joint;
blood sensing means for sensing a concentration of blood in the fluid and for producing a blood signal indicative of the concentration; and
fluid flow control means responsive to the blood signal and adapted for controlling the fluid inflow means to establish a rate of flow of the fluid to the region sufficient for maintaining the concentration of blood indicated by the blood signal below a predetermined maximum concentration over a time period suitably long for the performance of a surgical procedure. - View Dependent Claims (13, 14, 15, 16, 17, 20)
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18. A method of operating an internal tourniquet that includes a capsule through which fluid may be directed, comprising the steps of:
adjusting the fluid flow rate through the capsule in response to changes in the amount of blood in the capsule. - View Dependent Claims (19)
Specification