Method and apparatus for introducing a fluid into a human or animal organism as well as method and heating device for temperature control
First Claim
1. A method for introducing a physiological fluid into a human or animal organism at a prescribed temperature, wherein the fluid is pumped through a controlled heating device into a gravity tank and then introduced from the gravity tank through the same heating device into the organism by gravity, characterized in that during the pumping into the gravity tank the temperature of the fluid entering the heating device is measured and, on the basis of the measured temperature, a temperature or a heat flux causing substantially the prescribed temperature of the fluid discharging from the heating device is set in the heating device, and that during the introduction by gravity the temperature of the heating device is controlled to the prescribed temperature of the fluid.
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Accused Products
Abstract
Process and device for introducing a physiological fluid at a prescribed temperature in human and animal organisms. The fluid is pumped through a regulated heating means (59) into a gravity-feed container (95), then led by natural gravity out of the gravity-feed container (95) through the same heating means (59) into the organism. While the fluid is being pumped into the gravity-feed container (95, the temperature of the fluid entering the heating means (59) is measured and on the basis of the temperature measured the heating means (59) is set to a temperature or a corresponding heat flow which produces essentially the prescribed temperature of the fluid leaving the heating means (59). While the fluid is being led by natural gravity, the temperature of the heating means (59) is regulated until the prescribed temperature of the fluid is obtained. A heating means (59) suitable for this device comprises at least two heating lateral walls (28, 128) and a channel (47) passing between them. Each side wall (28, 128) has a heating resistance net and a temperature sensor. The resistance network is composed of a heating foil pattern (2, 102) formed on the side of an electrically isolating base plate (1, 101) facing the medium to be heated. On the other side of the base plate (1, 101) is formed a sensor foil pattern (3, 101) forming a temperature sensing resistance and covered with an isolating layer (15, 115).
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Citations
18 Claims
- 1. A method for introducing a physiological fluid into a human or animal organism at a prescribed temperature, wherein the fluid is pumped through a controlled heating device into a gravity tank and then introduced from the gravity tank through the same heating device into the organism by gravity, characterized in that during the pumping into the gravity tank the temperature of the fluid entering the heating device is measured and, on the basis of the measured temperature, a temperature or a heat flux causing substantially the prescribed temperature of the fluid discharging from the heating device is set in the heating device, and that during the introduction by gravity the temperature of the heating device is controlled to the prescribed temperature of the fluid.
- 8. An apparatus for introducing a physiological fluid into a human or animal organism at a prescribed temperature, comprising a pump for delivering the physiological fluid through a heating device provided with a control system into a gravity tank and a duct for introducing the fluid from the gravity tank through the same heating device into the organism, characterized in that said control system of the heating device comprises a control circuit for setting the temperature or the heat flux in the heating device and for said control circuit a reference unit producing a varying reference value altering proportionally to a measured temperature of the fluid entering the heating device during the delivery into the gravity tank and a constant reference value for maintaining the heating device at the prescribed temperature of the fluid during the introduction into the organism, and that an input of said reference unit is connected to an output of a first transducer measuring the temperature of the fluid entering the heating device.
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16. A method for controlling the temperature of a flowing medium, comprising the steps of:
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causing the medium to flow through a heating device having a heating element, measuring the temperature of the medium entering the heating device, measuring the temperature of the medium discharging the heating device, controlling the heating device by setting a temperature in the heating device so that the medium discharging from the heating device is of a prescribed temperature, said setting of a temperature in the heating device is performed by measuring the temperature in a place between said heating element and the flowing medium, producing a first signal proportional to the temperature measured in said place, producing a second signal on the basis of the temperatures of the entering and discharging medium, as well as of the specific heat, the flow rate and the prescribed temperature of the medium, and controlling said heating element according to the difference between said first and second signals. - View Dependent Claims (18)
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17. A method for controlling the temperature of a flowing medium comprising the steps of:
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causing the medium to flow through a heating device having a heating element, measuring the temperature of the medium entering the heating device, measuring the temperature of the medium discharging the heating device, controlling the heating device by setting a heat flux in the heating device so that the medium discharging from the heating device is of a prescribed temperature, said setting of a heat flux in the heating device is performed by measuring the temperatures in two places behind each other in the direction of the heat flux between said heating element and the flowing medium, producing a first signal proportional to the difference of the measured temperatures in said two placed, producing a second signal in the basis of the temperatures of the entering and discharging medium, as well as of the specific heat, the flow rate and the prescribed temperature of the medium, and controlling said heating element according to the difference between said first and second signals.
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Specification