Disposable cassette for intravascular heat exchange catheter
First Claim
1. A disposable cassette for supplying a heat exchange fluid to a heat exchange catheter, said cassette comprising:
- an external heat exchanger comprising a flow channel having an inlet and an outlet;
a first fluid supply line, said first fluid supply line in fluid communication with said flow channel inlet;
a pump head contained in the disposable fluid supply cassette, said pump head having a pump inlet and a pump outlet, said pump inlet in fluid communication with said external heat exchanger flow channel outlet for pumping fluid from said flow channel outlet;
a second fluid supply line, said second fluid supply line in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet; and
a pressure regulator, said pressure regulator in fluid communication with said pump outlet for regulating the pressure of fluid pumped from said pump.
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Accused Products
Abstract
A heat exchange fluid supply system for supplying a heat exchange fluid to an intravascular heat exchange catheter includes a disposable cassette having a bulkhead and an external heat exchanger, and which is configured to operate in combination with a reusable master control unit The bulkhead includes a reservoir section and a pump section. The reservoir section is provided with a means to monitor the amount of heat exchange fluid that is in the system. The bulkhead provides the mechanism for priming the system with heat exchange fluid from an external source and for circulating fluid to the catheter in a closed circuit. The pump section is configured to allow for pumping of heat exchange fluid at a constant pressure.
118 Citations
36 Claims
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1. A disposable cassette for supplying a heat exchange fluid to a heat exchange catheter, said cassette comprising:
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an external heat exchanger comprising a flow channel having an inlet and an outlet;
a first fluid supply line, said first fluid supply line in fluid communication with said flow channel inlet;
a pump head contained in the disposable fluid supply cassette, said pump head having a pump inlet and a pump outlet, said pump inlet in fluid communication with said external heat exchanger flow channel outlet for pumping fluid from said flow channel outlet;
a second fluid supply line, said second fluid supply line in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet; and
a pressure regulator, said pressure regulator in fluid communication with said pump outlet for regulating the pressure of fluid pumped from said pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A heat exchange fluid supply system for a heat exchange catheter, said system comprising:
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an external heat exchanger comprising a structural member and a compliant member, said compliant member sealed to said structural member in a pattern, said pattern forming a flow channel between said compliant member and said structural member;
said flow channel having an inlet and an outlet;
a first fluid supply line, said first fluid supply line in fluid communication with said flow channel inlet;
a bulkhead, said bulkhead comprising a pump and a reservoir, said reservoir having a reservoir inlet and a reservoir outlet, said reservoir inlet in fluid communication with said external heat exchanger flow channel outlet, said pump having a pump inlet and a pump outlet, said pump inlet in fluid communication with said reservoir outlet for pumping fluid from said reservoir outlet;
a second fluid supply line, said second fluid supply line in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet; and
an external fluid source, said external fluid source in fluid communication with said bulkhead. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A disposable cassette for supplying heat exchange fluid to a heat exchange catheter, said cassette comprising:
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an external heat exchanger having an inlet and an outlet;
a first fluid supply line, said first fluid supply line in fluid communication with said heat exchanger inlet;
a disposable pump head contained in the cassette, said pump head actuated by an electric motor, said pump head having an inlet and an outlet, and said pump inlet in fluid communication with said heat exchanger outlet; and
a second fluid supply line, said second fluid supply line in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A method for providing a temperature regulated source of heat exchange fluid for heat exchange catheters, comprising the steps of:
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providing a circuit comprising an external heat exchanger, a pump, a heat exchange catheter, and air vents, said external heat exchanger, pump and heat exchange catheter in fluid communication such that fluid pumped by the pump is circulated through said heat exchange catheter and said external heat exchanger, and said air vents allow passage of gas in and out of said circuit through said vents but do not allow passage of liquid in and out of said circuit though said air vents;
providing a heat generating or removing unit in heat exchange relationship with said external heat exchanger;
providing an external fluid source in fluid communication with said circuit;
circulating heat exchange fluid from said external source through said circuit by means of pumping with said pump while simultaneously venting any gas contained in said circuit out through said air vents; and
controlling the temperature of said heat exchanger fluid in said circuit by controlling the temperature of said heat generating or removing unit. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A cassette for supplying heat exchange fluid to a heat exchange catheter, said cassette comprising:
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an external heat exchanger comprising a structural member and a compliant member, said compliant member sealed to said structural member in a pattern, said pattern forming a flow channel between said compliant member and said structural member;
said flow channel having an inlet and an outlet;
a first fluid supply line, said first fluid supply line in fluid communication with said flow channel inlet;
a bulkhead, said bulkhead comprising a reservoir and a disposable pump head, said reservoir containing an inlet in fluid communication with said flow channel outlet, said reservoir further having a fluid level detector for detecting the level of fluid within said reservoir, said pump head being a cardioid vane pump head, said pump head actuated by an electric motor, said pump head having an inlet and an outlet, and said pump inlet in fluid communication with said reservoir outlet said electric motor is controlled by an amplifier controller, said amplifier controller supplying a constant current to said pump head thereby causing said pump head to supply a relatively constant pressure to said fluid in said second fluid supply line;
a second fluid supply line, said second fluid supply line in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet;
an external fluid source, said external fluid source in fluid communication with said reservoir, and a pressure damper, said pressure damper in fluid communication with said pump outlet.
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Specification