Method and device for applications of selective organ cooling
First Claim
1. A device for heating or cooling blood in a blood vessel, comprising:
- a catheter assembly capable of insertion to a selected vessel in the vascular system of a patient, including;
a heat transfer element at a distal end of the catheter assembly, the heat transfer element having a helical shape to create mixing, the mixing occurring in surrounding blood and in a working fluid, the two mixings caused by the shapes of opposite sides of the same heat transfer surface;
a supply catheter to deliver the working fluid to an interior of the heat transfer element;
a return catheter to return the working fluid from the interior of the heat transfer element; and
a drug delivery catheter running substantially parallel to the axis of the catheter assembly.
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Accused Products
Abstract
The invention provides a method and device for heating or cooling a surrounding fluid in a feeding vessel. The device includes a catheter assembly capable of insertion to a selected feeding vessel in the vascular system of a patient. The assembly includes a heat transfer element at a distal end of the catheter assembly, the heat transfer element having a plurality of exterior surface irregularities shaped and arranged to create turbulence in a surrounding fluid, the surface irregularities having a depth at least equal to the boundary layer thickness of flow of the surrounding fluid in the feeding vessel. The assembly also includes a supply catheter to deliver a working fluid to an interior of the heat transfer element, a return catheter to return a working fluid from the interior of the heat transfer element, and a drug delivery catheter running substantially parallel to the axis of the catheter assembly. The method includes selectively controlling the temperature of a selected volume of blood in a patient by introducing a catheter assembly into a blood vessel feeding a selected volume of blood in a patient and delivering a working fluid through a supply catheter in the catheter assembly and returning the working fluid through a return catheter in the catheter assembly. Heat is transferred between a heat transfer element forming a distal end of the catheter assembly and the volume of blood in the feeding vessel. A liquid, such as a drug, is delivered through a drug delivery catheter to the volume of blood in the feeding vessel.
171 Citations
19 Claims
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1. A device for heating or cooling blood in a blood vessel, comprising:
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a catheter assembly capable of insertion to a selected vessel in the vascular system of a patient, including;
a heat transfer element at a distal end of the catheter assembly, the heat transfer element having a helical shape to create mixing, the mixing occurring in surrounding blood and in a working fluid, the two mixings caused by the shapes of opposite sides of the same heat transfer surface;
a supply catheter to deliver the working fluid to an interior of the heat transfer element;
a return catheter to return the working fluid from the interior of the heat transfer element; and
a drug delivery catheter running substantially parallel to the axis of the catheter assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for beating or cooling blood in a blood vessel, comprising:
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a catheter assembly capable of insertion to a selected vessel in the vascular system of a patient, including;
a heat transfer element at a distal end of the catheter assembly, the heat transfer element having a helical shape to create mixing, the mixing occurring in surrounding blood and in a working fluid, the two mixings caused by the shapes of opposite sides of the same heat transfer surface, a distal end of the heat transfer element defining an orifice;
a supply catheter to deliver the working fluid to an interior of the heat transfer element, the supply catheter having a working fluid catheter disposed therein and further having disposed therein a drug delivery catheter running substantially parallel to the axis of the supply catheter, the working fluid catheter having defined thereon a number of outlets to communicate the working fluid from the interior of the supply catheter to a volume defined by the exterior of the supply catheter and the interior of the heat transfer element; and
a return catheter to return the working fluid from the interior of the heat transfer element.
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10. A method for selectively controlling the temperature of a selected volume of tissue in a patient, comprising:
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introducing a catheter assembly into a blood vessel feeding a selected volume of tissue in a patient;
delivering a working fluid through a supply catheter in the catheter assembly and returning the working fluid through a return catheter in the catheter assembly;
transferring heat between a heat transfer element forming a distal end of the catheter assembly and the blood in the feeding vessel by creating mixing, the mixing occurring in surrounding blood and in a working fluid, the two mixings caused by the shapes of opposite sides of the same heat transfer surface;
delivering a liquid through a drug delivery catheter to the blood in the feeding vessel. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification