SU760972A1 - Apparatus for hypothermy - Google Patents

Description

The invention relates to medical equipment, in particular to the resuscitation technique, and is intended for cooling and warming individual parts of the body or the whole body. five

A device for hypothermia is known, which contains a heat-insulated coolant tank, a heat exchanger, a filter trap, a perfusion pump, cannulas for connection to blood vessels and means for monitoring and controlling temperature and fluid flow [1].

However, in this device, cooling the brain takes a large amount of time, which makes it difficult to conduct 15 resuscitation.

The aim of the invention is to reduce the time for cooling the brain.

This goal is achieved by the fact that the device additionally contains a cylinder for blood-displacing fluid placed in a heat-insulated tank, and the cylinder is connected in series with the perfusion pump, heat exchanger, trap filter and cannulas.

In addition, the device is equipped with a level sensor located inside the cylinder.

The drawing schematically shows

hypothermia device. thirty

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The device consists of a refrigeration unit, which contains a heat-insulated coolant tank 1. Inside the tank 1, there is a cylinder 2 for the blood-substituting liquid with a level sensor in the form of a float unit 3, an evaporator 4 refrigerators, an electro-contact thermometer 5 and a submersible pump 6. The evaporator 4 is connected to the condenser 7 and the compressor of the refrigeration unit 8, and connect the pipes 9-11 in series a cylinder 2 with a perfusion pump 12, a heat exchanger 13, a filter trap 14 and cannulas (not shown).

The cooling fluid of the refrigeration unit circulates through the heat exchanger 13 through pipelines 15 and 16. In the heat-insulated tank 17 of the heating unit is installed a heater 18, a submersible pump 19, an electro-contact thermometer 20. The coolant, for example water, circulates through the heat exchanger 13 through pipelines 21 and 22 .

The cylinder 2 contains a mesh filter 23 for trapping microemboles, and the float assembly contains a float 24 and a rod 25 with a limiter 26. Moreover, the upper end of the rod 25 interacts with the limit switch 27 for automatic

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shutdown of the pump 12 when the critical level of liquid in the cylinder 2 is reached. In addition, the device is provided with means for controlling and regulating the temperature and flow rate of the liquid (not shown).

The device works as follows.

With the help of the compressor 8, the condenser 7, the evaporator 4, the thermometer 5 in the tank 1 and the cylinder 2 is maintained at a temperature of 2-4 ° C. The cylinder 2 is filled with sterile blood-substituting fluid. In case of resuscitation of a patient with a sudden stop of blood flow or ineffective heart work (for example, wounding of the heart and great vessels, ruptures, heart aneurysms, aorta, massive pulmonary embolism), to protect the brain from hypoxia, fluid is connected to the common carotid arteries 28. pipeline 9 is fed to pump 12 and pipelines 10, 11 through heat exchanger 13, the filter trap 14 and pipeline 28 are injected into the vascular network of the brain, which leads to an emergency cooling of the latter for 2-3 min. Fluid passed through the brain is extracted by catheterization of the main veins of the neck or superior vena cava.

In parallel and after cooling, perform surgery.

For subsequent infusion therapy, the balloon 2 through the filter screen 23 is filled with blood-substituting fluid or blood. Moreover, the latter, passing through the pipelines 9, 10, 11, 28 through the pump 12, the heat exchanger 13 and the filter-trap 14, if necessary, can be further cooled with the help of cooling fluid. The liquid from the tank 1 is pumped by the pump 6 through the pipeline 15 to the heat exchanger 13 and returns to the tank 1 through the pipeline 16.

To prevent air embolism when a critical level of fluid or blood in the cylinder 2 is reached, the float 24 on the rod 25 is lowered onto the stopper 26 and with its weight moves the rod 25 with the switch 27, which turns off the pump 12.

For immersion into hypothermia of the whole organism or mainly any area, the pipe 29 is connected to the central end of the artery by in vitro cooling of blood. Blood

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from the artery passes through the pump 12, the pipe 10, the heat exchanger 13, the pipe 11, the filter trap 14 and through the pipeline 28 is injected into the distal end of the artery (arterial-arterial shunt).

At the same time for the implementation of heat exchange from the tank 1 to the heat exchanger 13 by pump 6 through line 15 is supplied coolant, which returns through line 16 to tank 1.

Extracorporeal warming of the blood is carried out to remove the body from the state of hypothermia. In this case, the coolant in the tank 17 is heated to a temperature of 40-43 ° C and fed through the pipeline 21 to the heat exchanger 13, after which it returns through the pipeline 22.

The device allows emergency transvascular cooling of the brain or other tissues that are especially sensitive to hypoxia, creates the possibility of artificial feeding certain areas of the body according to arterial-arterial shunt, to conduct selective cooling or warming of a part of the body or the whole body for the purpose of resuscitation. In addition, the device reduces the risk of embolization of the vascular bed of the body.

Claims (2)

Claim 1. Device for hypothermia, containing a heat-insulated coolant tank, a heat exchanger, a filter trap, a perfusion pump, cannulas for connecting to blood vessels and means for monitoring and controlling the temperature and flow rate of the fluid, in order to reduce the time for cooling the head brain, the device additionally contains a cylinder for blood-displacing fluid placed in a heat-insulated tank, and the cylinder is connected in series with a pipeline to a perfusion pump, a heat exchanger com, filter trap and cannulas. 2. Device by π. 1, characterized in that it is equipped with a level sensor located inside the cylinder.