Automated occlusion clamp for centrifugal blood pumps
First Claim
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1. An extracorporeal blood circuit for heart-lung machines, comprising:
- a) a centrifugal blood pump arranged to pump blood through said circuit;
b) a line of flexible tubing forming part of said circuit, c) a power-actuatable clamping device disposed externally of said line, said device being arranged to normally clamp said line to occlude it, and to release said line for free blood flow therethrough when actuated; and
d) a flow sensor arranged to produce a signal indicative of blood flow through said line, said clamping device being actuated only as long as said signal indicates forward blood flow through said line.
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Abstract
Retrograde flow in an extracorporeal blood circuit using a centrifugal blood pump is prevented by passing the blood line through a normally-closed powered occlusion clamp, and opening the clamp in response to powering of the pump or, preferably, in response to the sensing of forward blood flow in the extracorporeal circuit.
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Citations
8 Claims
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1. An extracorporeal blood circuit for heart-lung machines, comprising:
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a) a centrifugal blood pump arranged to pump blood through said circuit;
b) a line of flexible tubing forming part of said circuit, c) a power-actuatable clamping device disposed externally of said line, said device being arranged to normally clamp said line to occlude it, and to release said line for free blood flow therethrough when actuated; and
d) a flow sensor arranged to produce a signal indicative of blood flow through said line, said clamping device being actuated only as long as said signal indicates forward blood flow through said line. - View Dependent Claims (2, 3, 5, 6, 7)
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4. An extracorporeal blood circuit for heart-lung machines, comprising:
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a) a centrifugal blood pump arranged to pump blood through said circuit;
b) a line of flexible tubing forming part of said circuit;
c) a power-actuatable clamping device disposed externally of said line, said device being arranged to normally clamp said line to occlude it, and to release said line for free blood flow therethrough when actuated; and
d) means for actuating said clamping device when said pump is energized.
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8. An extracorporeal blood circuit for heart-lung machines, comprising:
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a) a centrifugal blood pump arranged to pump blood through said circuit, b) a line of flexible tubing forming part of said circuit;
c) a power-actuatable clamping device disposed externally of said line, said device being arranged to normally clamp said line to occlude it, and to release said line for free blood flow therethrough when actuated; and
d) a control console for actuating said clamping device when said pump is energized.
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Specification