Catheter with coiled multi-lumen heat transfer extension
First Claim
1. A catheter, comprising:
- an elongate heat transfer extension housing having at least one supply lumen and at least on return lumen running longitudinally along the extension, the extension also including a distal fluid exchange reservoir providing a fluid redirecting path between the supply and return lumens;
a shape memory alloy structure causing the heat transfer extension to assume a coiled shape under predetermined shape-active temperatures and a non-coiled shape under predetermined shape-relaxed temperatures different from the shape-active temperatures; and
the lumens comprising a central lumen surrounded by multiple peripheral lumens, wherein the central lumen is the return lumen and the peripheral lumens are the supply lumens.
2 Assignments
0 Petitions
Accused Products
Abstract
A catheter includes a sealed multi-lumen heat transfer extension designed to internally circulate a coolant, and thereby cool tissue or fluid surrounding the catheter. The heat transfer extension includes a tube having a distally positioned region that coils about the tube'"'"'s longitudinal axis. The tube houses multiple lumens running longitudinally along the tube. These lumens include one or more supply lumens and one or more return lumens. A distal fluid exchange reservoir resides at the tube'"'"'s tip, for the purpose of redirecting fluid from the supply lumen(s) to the return lumen(s). The heat transfer extension may include a shape memory structure causing the heat transfer extension to vary its shape according to temperature. Namely, the extension assumes a coiled shape under predetermined shape-active temperatures, and it assumes a non-coiled shape under other predetermined shape-relaxed temperatures. The catheter also includes an interface having supply and return lines to provide coolant to the heat transfer extension, and remove coolant returning therefrom. To connect the supply/return lines with the supply/return lumens, the invention may include a fluid transfer housing. Optionally, one or more of the lumens may be configured as flow-through lumens to exchange fluids with the patient.
330 Citations
10 Claims
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1. A catheter, comprising:
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an elongate heat transfer extension housing having at least one supply lumen and at least on return lumen running longitudinally along the extension, the extension also including a distal fluid exchange reservoir providing a fluid redirecting path between the supply and return lumens;
a shape memory alloy structure causing the heat transfer extension to assume a coiled shape under predetermined shape-active temperatures and a non-coiled shape under predetermined shape-relaxed temperatures different from the shape-active temperatures; and
the lumens comprising a central lumen surrounded by multiple peripheral lumens, wherein the central lumen is the return lumen and the peripheral lumens are the supply lumens.
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2. A catheter, comprising:
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an elongate heat transfer extension housing having at least one supply lumen and at least on return lumen running longitudinally along the extension, the extension also including a distal fluid exchange reservoir providing a fluid redirecting path between the supply and return lumens;
a shape memory alloy structure causing the heat transfer extension to assume a coiled shape under predetermined shape-active temperatures and a non-coiled shape under predetermined shape-relaxed temperatures different from the shape-active temperatures; and
a shaping wire residing in one of the lumens and running longitudinally along the extension, the shaping wire comprising a material with a shape memory causing the wire to assume a coiled shape under the shape-active temperatures and a non-coiled shape under the shape-relaxed temperatures. - View Dependent Claims (3)
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4. A catheter, comprising;
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an elongate heat transfer extension housing having at least one supply lumen and at least on return lumen running longitudinally along the extension, the extension also including a distal fluid exchange reservoir providing a fluid redirecting path between the supply and return lumens;
a shape memory alloy structure causing the heat transfer extension to assume a coiled shape under predetermined shape-active temperatures and a non-coiled shape under predetermined shape-relaxed temperatures different from the shape-active temperatures; and
a valve positioned at the extension, the valve comprising an elastic disk shape member having an aperture penetrating through the disk.
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5. A method of operating a heat exchange catheter that includes an elongate heat transfer extension housing at least one supply lumen and at least one return lumen running longitudinally along the extension, the extension also including a distal fluid exchange reservoir providing a fluid redirecting path between the supply and return lumens;
- shape memory structure causing the heat transfer extension to assume a coiled shape under predetermined shape-active temperatures and a non-coiled shape under predetermined shape-relaxed temperatures different from the shape-active temperatures;
the method comprising operations of;inserting the catheter into a patient'"'"'s body;
responsive to heat of the patient'"'"'s body, the shape memory structure causing the heat transfer extension to assume the coiled shape; and
circulating a heat exchange fluid through the catheter. - View Dependent Claims (6, 7, 8, 9, 10)
circulating fluid outward through the peripheral lumens to the distal tip and then in a reverse direction through the central lumen.
- shape memory structure causing the heat transfer extension to assume a coiled shape under predetermined shape-active temperatures and a non-coiled shape under predetermined shape-relaxed temperatures different from the shape-active temperatures;
Specification