Disposable cassette for intravascular heat exchange catheter

• US 6,890,347 B2
• Filed: 07/25/2003
• Issued: 05/10/2005
• Est. Priority Date: 08/24/1998
• Status: Expired due to Term

• Current Assignee: Zoll Circulation Incorporated (Asahi Kasei Corporation)
• Original Assignee: Radiant Medical, Inc. (Asahi Kasei Corporation)
• Inventors: Machold, Timothy R., Roth, Alex T., Bloom, Nicole Denise, Alejandro, Jose, Oliver, Ed, Scott, Dave J.
• Primary Examiner(s): Nasser, Robert L.
• Application Number:
  US10/628,055
• Publication Number:
  US 20040024437A1
• Time in Patent Office: 655 Days
• Field of Search: 607/96, 607108-112, 607/114, 417/477.2
• US Class Current: 607/96
• CPC Class Codes: A61B 2017/00119 alarm; indicating an abnormal situation
• CPC Class Codes: A61B 2017/00123 and automatic shutdown
• CPC Class Codes: A61B 2017/22051 with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation A61B2017/22048, A61B2017/3486 take precedence
• CPC Class Codes: A61F 2007/0054 with a closed fluid circuit, e.g. hot water
• CPC Class Codes: A61F 2007/0096 with a thermometer
• CPC Class Codes: A61F 2007/126 for invasive application, e.g. for introducing into blood vessels
• CPC Class Codes: A61F 7/0085 Devices for generating hot or cold treatment fluids
• CPC Class Codes: A61F 7/10 Cooling bags, e.g. ice-bags
• CPC Class Codes: A61F 7/12 Devices for heating or cooling internal body cavities
• CPC Class Codes: A61F 7/123 using a flexible balloon containing the thermal element
• CPC Class Codes: A61M 2025/1072 having balloons with two or more compartments
• CPC Class Codes: A61M 2025/1086 having a special balloon surface topography, e.g. pores, protuberances, spikes or grooves
• CPC Class Codes: A61M 2205/127 with provisions for heating or cooling
• CPC Class Codes: A61M 25/1011 Multiple balloon catheters
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: F28D 1/0341 with U-flow or serpentine-flow inside the conduits
• CPC Class Codes: F28D 2021/005 for medical applications heating or cooling appliances for medical treatment A61F7/00
• CPC Class Codes: F28F 3/12 Elements constructed in the shape of a hollow panel, e.g. with channels F28D1/02, F28D1/03 take precedence
• CPC Class Codes: F28F 9/0246 Arrangements for connecting header boxes with flow lines

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.

Claims

1. A cassette for supplying heat exchange fluid to a heat exchange catheter, said cassette comprising:

an external heat exchanger comprising a relatively stiff structural member and a compliant member, said compliant member sealed to said structural member in a pattern, said pattern forming 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 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.

2. The cassette of claim 1 wherein said first and said second fluid supply lines are connected in a circuit through a heat exchange catheter.

3. The cassette of claim 1, further comprising 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 inlet in fluid communication with said reservoir outlet for pumping fluid from said reservoir outlet, and wherein said second fluid supply line is in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet.

4. The cassette of claim 3 wherein said reservoir further comprises a fluid level detector.

5. The cassette of claim 4 wherein said fluid level detector comprises a prism mounted within said reservoir, an optical beam source and an optical beam sensor, said source and sensor being mounted adjacent to said prism.

6. The cassette of claim 1, wherein said amplifier controller is responsive to signals received from a system controller to vary the current supplied to said electric motor to control the flow of fluid in said second fluid supply line.

7. The cassette of claim 6, wherein the system controller includes a feedback circuit, the feedback circuit being responsive to signals received from sensors in thermal contact with a patient'"'"'s body to provide control signals to said electric motor to control the flow of fluid in said second fluid supply line.