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US 6,579,257 B1Granted
Automated occlusion clamp for centrifugal blood pumps
AssigneeMedtronic, Inc.
InventorsRoger J. Elgas, Michael P. Petersen
Life of this patent
Estimating the term…
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.
Claims8
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.
2 more elements
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) means for actuating said clamping device when said pump is energized.
2 more elements
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 control console for actuating said clamping device when said pump is energized.
2 more elements
Dependencies are inferred from the claim text.