Indwelling heat exchange catheter and method of using same
First Claim
1. A catheter adapted to exchange heat with a body fluid flowing in a first direction through a body conduit, the catheter comprising:
- a shaft having an axis extending between a proximal end and a distal end, the shaft having an input lumen and output lumen;
a heat exchange region disposed a the distal end of the shaft and including a first balloon and a second balloon each having an outer surface adapted to be operatively placed in heat exchange relationship with the body fluid flowing in the first direction;
the input lumen of the shaft being coupled to the first balloon at a first location, and the output lumen of the shaft being coupled to the first balloon at a second location so that a heat exchange fluid introduced into the input lumen will enter the first balloon at the first location and will exit the first balloon at the second location through the output lumen; and
the first location being disposed in the first direction relative to the second location when the catheter is operatively disposed in the body fluid.
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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 at least one balloon which is adapted to receive a remotely cooled heat exchange fluid preferably flowing in a direction counter to that of the body fluid. Embodiments including multiple balloons enhance the surface area of contact, and the mixing of both the heat exchange and the body fluid. The catheter can be positioned to produce hypothermia in a selective area of the body without cooling the entire body system. It is of particular advantage in brain surgeries where stroke, trauma or cryogenic tumors can best be addressed under hypothermic conditions.
351 Citations
35 Claims
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1. A catheter adapted to exchange heat with a body fluid flowing in a first direction 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 output lumen; a heat exchange region disposed a the distal end of the shaft and including a first balloon and a second balloon each having an outer surface adapted to be operatively placed in heat exchange relationship with the body fluid flowing in the first direction; the input lumen of the shaft being coupled to the first balloon at a first location, and the output lumen of the shaft being coupled to the first balloon at a second location so that a heat exchange fluid introduced into the input lumen will enter the first balloon at the first location and will exit the first balloon at the second location through the output lumen; and the first location being disposed in the first direction relative to the second location when the catheter is operatively disposed in the body fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A heat exchange catheter, comprising:
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a shaft having an axis, a fluid inlet lumen, and a fluid outlet lumen each extending generally between a proximal end and a distal end of the shaft; a hub disposed at the proximal end of the shaft and providing access to the fluid inlet lumen and the fluid outlet lumen; a first balloon disposed at the distal end of the shaft and defining with the shaft an inflatable first cavity; portions of the shaft define a first inlet hole extending in fluid communication between the fluid inlet lumen of the shaft and the first cavity of the first balloon; portions of the shaft defining a first outlet hole extending in fluid communication between the first cavity and the fluid outlet lumen of the shaft; a second balloon disposed relative to the first balloon at the distal end of the shaft and defining with the shaft an inflatable second cavity; portions of the shaft defining a second inlet hole extending in fluid communication with the fluid inlet lumen of the shaft and the second cavity of the balloon; and portions of the shaft defining a second outlet hole extending in fluid communication with the second cavity and the fluid outlet lumen. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A heat exchange catheter, comprising:
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a shaft having an axis, a fluid inlet lumen, and a fluid outlet lumen each extending generally between a proximal end and a distal end of the shaft; a hub disposed at the proximal end of the shaft and providing access to the fluid inlet lumen and the fluid outlet lumen; a first balloon disposed at the distal end of the shaft and defining with the shaft an inflatable first cavity; portions of the shaft define a first inlet hole extending in fluid communication between the fluid inlet lumen of the shaft and the first cavity of the first balloon; a second balloon disposed relative to the first balloon at the distal end of the shaft and defining with the shaft an inflatable second cavity; portions of the shaft defining a second outlet hole extending in fluid communication with the second cavity and the fluid outlet lumen; and an elastomeric coating disposed to cover a volume between the first balloon and the second balloon to facilitate laminar flow around the catheter.
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32. A heat exchange catheter, comprising:
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a shaft having an axis, a fluid inlet lumen, and a fluid outlet lumen each extending generally between a proximal end and a distal end of the shaft; a hub disposed at the proximal end of the shaft and providing access to the fluid inlet lumen and the fluid outlet lumen; a first balloon disposed at the distal end of the shaft and defining with the shaft an inflatable first cavity; portions of the shaft define a first inlet hole extending in fluid communication between the fluid inlet lumen of the shaft and the first cavity of the first balloon; portions of the shaft defining a first outlet hole extending in fluid communication between the first cavity and the fluid outlet lumen of the shaft; a second balloon disposed radially of the first balloon at the distal end of the shaft and defining with the shaft an inflatable second cavity; portions of the shaft defining a second inlet hole extending in fluid communication with the fluid inlet lumen of the shaft and the second cavity of the balloon; and portions of the shaft defining a second outlet hole extending in fluid communication with the second cavity and the fluid outlet lumen.
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33. 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 output lumen; a heat exchange region disposed at the distal end of the shaft and including a plurality of hollow fibers each having an out surface adapted to be operatively placed in heat exchange relationship with the body fluid flowing in the first direction; and 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. - View Dependent Claims (34)
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35. A heat exchange catheter, comprising:
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a shaft having an axis, a fluid inlet lumen, and a fluid outlet lumen each extending generally between a proximal end and a distal end of the shaft; a hub disposed at the proximal end of the shaft and providing access to the fluid inlet lumen and the fluid outlet lumen; a first balloon disposed at the distal end of the shaft and defining with the shaft an inflatable first cavity; portions of the shaft define a first inlet hole extending in fluid communication between the fluid inlet lumen of the shaft defining a first outlet hole extending in fluid communication between the first cavity and the fluid outlet hole extending in fluid communication between the first cavity and the fluid outlet lumen of the shaft, the first outlet hole being larger than the first inlet hole; a second balloon disposed axially of the first balloon at the distal end of the shaft and defining with the shaft an inflatable second cavity; portions of the shaft defining a second inlet hole extending in fluid communication with the fluid inlet lumen of the shaft and the second cavity of the balloon; and portions of the shaft defining a second outlet hole extending in fluid communication with the second cavity and the fluid outlet lumen, the second outlet hole being larger than the second inlet hole.
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Specification