RU2285544C2 - Device for performing normothermic infusion therapy - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: device can be used in branches of medicine where intra-vessel and intra-cavity infusions of sterile solutions are used. Infusion hose of standard sterile system for blood transfusion goes through air-proof heat exchanger provided with top and lower air-tight connectors. Heat exchanger is provided with rigid and flexible cases; both cases communicate. Cases are filled with liquid heat carrier warmed up to required temperature by means of automatic thermostat mounted in rigid case. Inside rigid case the circulation pump is mounted which pump is connected to input of channel for pumping liquid hear carrier over. Output of pump is disposed inside air-tight heat exchange close to lower connector. Automatic thermostat is made with alarm switching-off of heater when heat carrier reaches critical temperature. Top connector is mounted into rigid case.

EFFECT: reliable air-tightness; better mobility; reduced time for switching device into operation mode.

1 dwg

Description

The invention relates to medical equipment, more specifically to medical equipment used for intravascular and intracavitary administration of sterile solutions during intensive care and resuscitation, as well as during surgical intervention and in the postoperative period, obstetrics, pediatrics, emergency and emergency medical care, disaster medicine infusion during transportation of victims.

As a rule, during infusion therapy, the temperature of the infusion media is at best equal to the ambient temperature (if the solutions are not stored in the refrigerator) and ranges from 16 ° C to 24 ° C depending on the season. Intravascular infusion of cold solutions causes vasospasm and a decrease in peripheral blood flow, which leads to a decrease in the delivery of oxygen and nutrients to tissues. Side effects of such therapy also include chills, cardiac arrhythmias, pneumonia, suppuration of postoperative wounds, bleeding disorders, etc.

A device for heating infusion solutions, consisting of a vertical container made of plastic, located between two electric heating plates (France, patent No. 2403083, IPC A 61 M 5/14, 1997).

The known device has a number of significant disadvantages, the main of which are:

- the impossibility of using infusion systems produced by other companies, due to rigidly defined dimensions of the longitudinal grooves;

- the probability of getting a patient with iatrogenic air embolism, because when air bubbles enter the transfusion system, it is difficult to spot them for medical personnel due to the opacity of the rigid modules.

The last drawback is inherent in the device for heating the infusion solutions, in which the heating element is a rigid metal plate, between which there is a vertical flat container with fittings for supplying and discharging a sterile infusion medium (US Patent No. 4,309,592, IPC A 61 M 5/14, 1979 g.).

A device for heating infusion solutions is known, in which the flow heater is made in the form of several rigid removable modules in canisters fixed on the infusion solution hose (Russia, patent No. 2093195, IPC A 61 M 5/14, 1998).

The device has a number of significant disadvantages, the main of which are:

- the opacity of the rigid modules, which makes it difficult to detect air bubbles entering the transfusion system, which can lead to iatrogenic air embolism;

- the absence of a fault signal for modules and temperature sensors, which can lead to a decrease in the effectiveness of the therapy or overheating of the liquid and tragic changes in the protein structures of the blood and transfused solutions;

- heat loss in the areas between the heating modules, resulting in a decrease in the thermodynamic efficiency of the device, which is especially noticeable at a high rate of infusion of solutions and at a low initial temperature of the infused fluid;

- the presence of numerous protruding parts, creating a high likelihood of "clinging" moments, and a significant mass of heating modules, leading to pulling out the needle from the vein of the patient or the vial with the infusion solution and depressurization of the sterile system.

Closest to the proposed invention is a device for infusion therapy, designed to heat solutions administered intravenously using a standard system for blood transfusion (certificate for rationalization No. 527 of 05/30/1983, issued by 1 Sechenov Moscow Medical Institute Information about him was published in J. "Anesthesiology and Intensive Care" 1984, No. 2). The hose of a standard system for blood transfusion is inserted into a flexible heat exchanger, through which a heat transfer fluid heated in an automatic thermostat is pumped with a circulation pump. Using transition connectors, the heat exchanger is sealed. The cold solution coming from the bottle through the dropper and flow regulator acquires the temperature of the coolant and enters the injection needle.

The disadvantages of this device are:

- inconvenience in operation due to the presence of a stationary automatic thermostat and channels for pumping liquid coolant, made in the form of long tubes;

- the complexity of preparation for work and the lack of mobility due to the large volume of coolant (up to 8 l);

- large heat loss in the channels of the pumping liquid coolant outside the heat exchanger.

The objectives of the present invention are:

- ensuring ease of use;

- ensuring the mobility of the device;

- reduction of heat loss;

- providing operational preparation of the device for therapeutic measures.

The technical results of the present invention are:

- reducing the risk of depressurization of a standard sterile system for blood transfusion during operation;

- ensuring mobility and reducing the time to bring the device into operation by reducing the volume of coolant (up to 0.6 l);

- increase the thermodynamic efficiency of the device.

The specified technical result is achieved by the fact that in the known device for infusion therapy containing a standard sterile system for blood transfusion, the infusion hose of which is passed through the upper and lower sealing connectors, which is equipped with a sealed heat exchanger, including a flexible housing and filled with a liquid coolant, an automatic thermostat, circulating a pump connected to the inlet of the liquid coolant transfer channel, the outlet of which is located near the lower sealing connector, into the seal The heat exchanger is additionally introduced with a rigid housing located above the flexible housing and connected with it, an automatic thermostat and a circulation pump are installed inside the rigid housing, while the automatic thermostat is made with emergency shutdown of the heater when the coolant reaches a critical temperature, the liquid transfer channel is located inside the hermetic heat exchanger, and the upper sealing connector is mounted in a rigid case.

The invention is illustrated in the drawing (figure 1), which shows a General view of a device for normothermic infusion therapy.

The proposed device contains a standard sterile system for blood transfusion, which includes a bottle (1) with injection liquid, a dropper (2), a flow regulator (3), an injection needle (4), an infusion hose (5). The infusion hose is passed through the upper sealing connector (6) and the lower sealing connector (7), which are equipped with a hermetic heat exchanger consisting of a rigid housing (8) and a flexible housing (9) connected to it. The rigid case consists of a sealed compartment (10) filled with liquid coolant, and an unsealed instrument compartment (11). The automatic thermostat includes a heater (12), a current temperature sensor (13), a critical temperature sensor (14) electrically connected to a heater control unit (15) located in an unsealed compartment. A circulating pump (16), a heater, a current temperature sensor, and a critical temperature sensor are installed inside the rigid sealed compartment. The circulation pump is connected to the input of the channel (17) for pumping liquid coolant, the output of which is located near the lower sealing connector.

The device operates as follows.

The infusion hose of a standard sterile system for blood transfusion is passed through a heat exchanger filled with a liquid coolant, the temperature of which is maintained within the required norm (no more than 42 ° C) using an automatic thermostat. The infusion medium in the hose is heated to a temperature of not more than 42 ° C. The automatic thermostat contains a heater located directly in the coolant and providing its heating. As a heater, a tubular electric heater (TEN) of type 29 A 7.4 / 014 J 12 GOST 13268-88, TU 5114-1-90 can be used. The electronic control unit for the heater includes two series-connected keys in the electric circuit of the heater, one of which is controlled by a current temperature sensor (for example, a thermistor), and the second by a critical temperature sensor (for example, a mercury contact thermometer). If the coolant temperature reaches 42 ° C, the electronic unit performs an emergency shutdown of the heater by the signal of the critical temperature sensor. The device can be mounted on a tripod or bedside devices.

The inventive device has, in comparison with the prototype, several advantages: it is more compact, mobile, simpler and more convenient to use. The device is a portable, easily portable device. It can be widely used both in hospital hospitals (in intensive care units, therapies, surgery, traumatology, burn centers, etc.), as well as in cars and ambulances, in mobile medical complexes to provide effective medical care in the field and in extreme situations.

Claims (1)

An infusion therapy device comprising a heat exchanger, an automatic thermostat, a circulation pump and a sterile system for blood transfusion, including a dropper, a flow regulator, an infusion hose passed through the upper and lower sealing connectors of a heat exchanger filled with a liquid heat carrier containing a flexible housing, while the circulation pump is connected to the inlet of the pumping channel of the coolant, the output of which is located near the lower sealing connector, characterized in that in the seal The heat exchanger is additionally introduced with a rigid housing located above the flexible housing, communicating with it and consisting of instrumented and sealed compartments filled with liquid heat carrier, an automatic thermostat and a circulation pump are installed inside the rigid housing, a critical temperature sensor is inserted into the automatic thermostat connected to the heater electronic control unit having the possibility of emergency shutdown of the heater, the channel for pumping liquid coolant is located inside the hermetic th heat exchanger and the upper sealing plug mounted in a rigid case.