HEAT TRANSFER LIQUID FOR A TEMPERATURE CONTROL DEVICE FOR EXTRACORPOREAL CIRCULATION

Abstract

The present application refers to a heat transfer liquid for a temperature control device for human body temperature control during extracorporeal circulation, a temperature control device, the use of heat transfer liquid for extracorporeal circulation and a method of human body temperature control using a heat transfer liquid. The heat transfer liquid consists of ethylene glycol or propylene glycol at about 25 volume-percent to about 35 volume-percent, hydrogen peroxide at 0.05 volume-percent or less and sterile, filtered and de-mineralized water as rest.

Claims

1-6. (canceled)

7. Heat transfer liquid for a temperature control device for human body temperature control during extracorporeal circulation, the heat transfer liquid consisting of ethylene glycol or propylene glycol at about 25 volume-percent to about 35 volume-percent, hydrogen peroxide at 0.05 volume-percent or less, and sterile, filtered and de-mineralized water as rest.

8. The heat transfer liquid of claim 1, comprising ethylene glycol or propylene glycol at about 30 volume-percent.

9. The heat transfer liquid of claim 1, comprising hydrogen peroxide at about 0.01 volume-percent to about 0.03 volume-percent, preferably about 0.02 volume-percent.

10. A temperature control device for human body temperature control during extracorporeal circulation comprising the heat transfer liquid according to claim 1.

11. Use of the heat transfer liquid of claim 1 in a temperature control device for human body temperature control during extracorporeal circulation,

12. A method of human body temperature control during extracorporeal circulation, which temperature control is achieved by using heat transfer liquid according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 shows a schematic diagram illustrating a temperature control device in a heat exchanging system.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

[0020] FIG. 1 shows a schematic diagram of a heat exchanger 10 for human body temperature control during extracorporeal circulation. The heat exchanger 10 comprises a blood side 12 and a heat transfer liquid side 14 in which blood and a heat transfer liquid are respectively circulated.

[0021] The temperature of the heat transfer liquid used in the heat exchanger 10 is controlled by a heater and/or cooler 24, i.e. a temperature control device. The heater and/or cooler 24 is a device which is capable of heating or cooling or heating and cooling the heat transfer liquid. Preferably, the heater or cooler is capable of both heating and cooling the heat transfer liquid so that a defined temperature of the heat transfer liquid can be maintained. The heater and/or cooler 24 is part of a heat transfer liquid side circuit 26 in which the heat transfer liquid is circulated for operating the heat exchanger 10 in controlling the temperature of the human body of a patient.

[0022] The heater and/or cooler 24 may be provided with a disinfectant sensor 16 configured for measuring a concentration of a disinfectant in the heat transfer liquid in the heater and/or cooler 2. The result of the measurement of the sensor 16 may be transmitted to a computer 18 which may control a first display 20 which may indicate the measured concentration of disinfectant in the heat transfer liquid and a second display 22 which may indicate the consequence of the measured concentration. In particular, the second display 22 may indicate whether the disinfection status of the heat transfer liquid is ok, whether disinfectant is to be added or whether the heat transfer liquid is to be exchanged.

[0023] The heat transfer liquid circulated in the heat transfer liquid side circuit 26 of the present embodiment consists of ethylene glycol or propylene glycol at 30 volume-percent, hydrogen peroxide at 0.02 volume-percent and sterile, filtered and de-mineralized water as rest. In particular the hydrogen peroxide may be considered by the sensor 16 as disinfectant and a concentration of hydrogen peroxide may be measured by the sensor 16, But also a concentration of ethylene glycol or propylene glycol can be determined by the sensor 16 or a different sensor.

[0024] Measuring the concentration of disinfectant, be it hydrogen peroxide, ethylene glycol or propylene glycol is, however, optional and not essential for the present disclosure.