Disposable cassette for intravenous heat exchange catheter

• US 7,247,165 B2
• Filed: 05/09/2005
• Issued: 07/24/2007
• Est. Priority Date: 08/24/1998
• Status: Expired due to Fees

• 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, Edward A., Scott, Dave J.
• Primary Examiner(s): Nasser; Robert L.
• Application Number:
  US11/125,604
• Publication Number:
  US 20050209658A1
• Time in Patent Office: 806 Days
• Field of Search: 607/96, 607104-112, 607/114
• US Class Current: 607/104
• 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 disposable cassette for supplying heat exchange fluid to a heat exchange catheter, the disposable cassette configured to be placed in thermal communication with a heating/cooling source, said disposable cassette comprising:

an external heat exchanger having a an inlet and an outlet;

a bulkhead including a disposable pump head and a reservoir, the pump head actuated by an electric motor, the disposable pump head having an inlet and an outlet, the pump inlet in fluid communication with said heat exchanger outlet; and

a fluid circuit having a first fluid supply line in fluid communication with the heat exchange inlet and a second fluid supply line in fluid communication with the pump outlet, the fluid circuit being open such that fluid may be added to the fluid circuit before use.

2. The cassette of claim 1 wherein 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.

3. The cassette of claim 1 which further comprises a pressure regulator, said pressure regulator being in fluid communication with said pump outlet for regulating the pressure of fluid pumped from said pump head.

4. The cassette of claim 1 wherein said pump head is a cardioid vane pump.

5. The cassette of claim 4 wherein said pump head comprises a rotor that is fitted with a vane for moving fluid from the pump, said rotor being positioned in a quasi-cardioid shaped cavity.

6. The cassette of claim 5 wherein:

(a) said cavity has a circumference, said rotor has a diameter “

D”

, and said vane has a length “

L”

;

(b) the cavity circumference comprises;

(i) a first arc defined by 330°

to 30° and

having a radius R₁;

(ii) a second arc defined as 150°

to 210° and

having a radius R₂;

(iii) a third arc defined as 30°

to 150° and

having a radius R₃; and

(iv) a fourth arc defined as 210°

to 330° and

having a radius R₄;

(c) wherein all measurements are based upon the center of the rotor and 0°

is identified with the point midway between the inlet and the outlet of the cavity;

wherein the radii are defined as;

R₁=D/2

R₂=L−

(D/2)

R₃=(D/2)+{[(L−

D)/2]·

[cos(1.5θ

+135)]}

R₄=(D/2)+{[(L−

D)/2]·

[cos(1.5θ

−

315)]}.

7. The cassette of claim 1 wherein said pump head is an impeller pump.

8. The cassette of claim 1 wherein said pump head is a gear pump.

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

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 exchange inlet;

a disposable pump head and a reservoir contained in a bulkhead, 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 an outlet of the reservoir;

a pressure regulator, said pressure regulator being in fluid communication with said pump outlet for regulating the pressure of fluid pumped from said pump head; 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; and

wherein the heat exchanger, pump, first fluid supply line and second fluid supply line form a fluid circuit that is an open loop to the extent that the fluid circuit may be filled with fluid from an external source prior to use;

wherein 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.