Heat exchange catheters with bi-directional fluid flow and their methods of manufacture and use
First Claim
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1. A heat exchange catheter device comprising:
- an elongate body having an inflow lumen, an outflow lumen and a heat exchange region, wherein the heat exchange region comprises a tubular conduit, one end of said tubular conduit being connected to the inflow lumen and the other end of said tubular conduit being connected to the outflow lumen;
a first segment of the tubular conduit having loops or convolutions of a first diameter or cross-dimension, said first segment forming a fluid supply flow path through which heat exchange fluid may flow in a distal direction from the end of the tubular conduit that is connected to the inflow lumen;
a second segment of the tubular conduit having loops or convolutions of a second diameter or cross-dimension, said second segment forming a fluid return flow path through which heat exchange fluid may return in a proximal direction to the end of the tubular conduit that is connected to the outflow lumen;
wherein one of said first and second diameters or cross-dimensions is larger than the other of said first and second diameters or cross-dimensions.
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Abstract
Closed loop heat exchange catheters having bi-directional flow heat exchange regions and their methods of manufacture and use. The heat exchange region may be formed of expandable or non-expandable tubular conduit(s) that are configured in a series of loops or coiled configuration defining a supply flow path and a return flow path through which heat exchange medium is circulated. The individual loops of convolutions of the coiled configuration may be the same or different size. In some embodiments, the tubular conduit(s) may be passed through generally transverse bore holes formed in a catheter shaft so that the loops or convolutions of protrude from the catheter shaft.
38 Citations
22 Claims
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1. A heat exchange catheter device comprising:
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an elongate body having an inflow lumen, an outflow lumen and a heat exchange region, wherein the heat exchange region comprises a tubular conduit, one end of said tubular conduit being connected to the inflow lumen and the other end of said tubular conduit being connected to the outflow lumen; a first segment of the tubular conduit having loops or convolutions of a first diameter or cross-dimension, said first segment forming a fluid supply flow path through which heat exchange fluid may flow in a distal direction from the end of the tubular conduit that is connected to the inflow lumen; a second segment of the tubular conduit having loops or convolutions of a second diameter or cross-dimension, said second segment forming a fluid return flow path through which heat exchange fluid may return in a proximal direction to the end of the tubular conduit that is connected to the outflow lumen; wherein one of said first and second diameters or cross-dimensions is larger than the other of said first and second diameters or cross-dimensions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A heat exchange catheter device comprising:
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a proximal catheter shaft having an inflow lumen, an outflow lumen and a distal end; a heat exchanger which extends from the distal end of the catheter shaft, said heat exchanger comprising a tubular conduit, one end of said tubular conduit being connected to the inflow lumen and the other end of said tubular conduit being connected to the outflow lumen; a first segment of the tubular conduit having loops or convolutions of a first diameter or cross-dimension, said first segment forming a fluid supply flow path through which heat exchange fluid may flow in a distal direction from the end of the tubular conduit that is connected to the inflow lumen; a second segment of the tubular conduit having loops or convolutions of a second diameter or cross-dimension, said second segment forming a fluid return flow path through which heat exchange fluid may return in a proximal direction to the end of the tubular conduit that is connected to the outflow lumen; wherein one of said first and second diameters or cross-dimensions differs from the other of said first and second diameters or cross-dimensions. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification