Indwelling heat exchange catheter and method of using same
First Claim
1. A catheter having an elongate configuration with a proximal end and a distal end, the catheter configured to contain a heat exchange fluid in heat exchange relationship with at least a portion of the body of a patient and comprising:
- an outer tube having an elongate configuration and a first lumen;
an inner tube disposed in the first lumen of the outer tube and having a second lumen extending between the proximal end and the distal end of the catheter;
portions of the inner tube defining a first heat exchange fluid flow path extending along the second lumen between the proximal end and the distal end of the catheter;
portions of the outer tube and the inner tube defining a second heat exchange fluid flow path extending between the proximal end and the distal end of the catheter; and
a plurality of hollow fibers having walls defining lumens for containing the heat exchange fluid, the hollow fibers being sealingly coupled to the first heat exchange fluid flow path and the second heat exchange fluid flow path to thereby provide a closed fluid connection between the first fluid flow path and the second fluid flow path for transport of heat exchange fluid between the first fluid flow path and the second fluid flow path, the heat exchange fluid being a circulating liquid.
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Accused Products
Abstract
A catheter is adapted to exchange heat with a body fluid, such as blood, flowing in a body conduit, such as a blood vessel. The catheter includes a shaft with a heat exchange region disposed at its distal end. This region may include hollow fibers which are adapted to receive a remotely cooled heat exchange fluid preferably flowing in a direction counter to that of the body fluid. The hollow fibers enhance the surface area of contact, as well as the mixing of both the heat exchange fluid and the body fluid. The catheter can be positioned to produce hypothermia in a selective area of the body or alternatively positioned to systemically cool the entire body system.
72 Citations
19 Claims
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1. A catheter having an elongate configuration with a proximal end and a distal end, the catheter configured to contain a heat exchange fluid in heat exchange relationship with at least a portion of the body of a patient and comprising:
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an outer tube having an elongate configuration and a first lumen;
an inner tube disposed in the first lumen of the outer tube and having a second lumen extending between the proximal end and the distal end of the catheter;
portions of the inner tube defining a first heat exchange fluid flow path extending along the second lumen between the proximal end and the distal end of the catheter;
portions of the outer tube and the inner tube defining a second heat exchange fluid flow path extending between the proximal end and the distal end of the catheter; and
a plurality of hollow fibers having walls defining lumens for containing the heat exchange fluid, the hollow fibers being sealingly coupled to the first heat exchange fluid flow path and the second heat exchange fluid flow path to thereby provide a closed fluid connection between the first fluid flow path and the second fluid flow path for transport of heat exchange fluid between the first fluid flow path and the second fluid flow path, the heat exchange fluid being a circulating liquid. - View Dependent Claims (2, 3, 4, 5)
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6. A catheter adapted to exchange heat with a body fluid flowing through a body conduit, the catheter comprising:
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a shaft having an axis extending between a proximal end and a distal end, the shaft having an input lumen and an output lumen, the shaft further including an inner tube disposed within an outer tube;
a heat exchange region disposed at the distal end of the shaft and including a plurality of hollow fibers each having an outer surface adapted to be operatively placed in heat exchange relationship with the body fluid flowing in the first direction;
the hollow fibers being disposed in fluid communication with the input lumen and the output lumen to facilitate a flow of heat exchange fluid through the hollow fibers to cool the body fluid in the conduit without allowing the heat exchange fluid to enter the bloodstream;
a first manifold and a second manifold; and
the hollow fibers being coupled to the inner tube at the first manifold and to the outer tube at the second manifold.
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7. A catheter adapted to exchange heat with fluid flowing through a blood vessel, comprising;
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a catheter body having at least one heat exchange fluid supply lumen and at least one heat exchange fluid return lumen; and
plurality of elongated hollow heat exchange elements communicating with the supply lumen and with the return lumen, each element defining an outer heat exchange surface across which heat can be exchanged with a fluid flowing in the blood vessel, a heat exchange liquid circulating through the catheter without mixing with blood in the blood vessel. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification