RU2103959C1 - Thermochemical medical heating pad - Google Patents

Abstract

FIELD: medical engineering. SUBSTANCE: heating pad external waterproof flat packet in which number of layers of reactive oxidizing mixture is positioned. Mixture includes flexible polymeric binder with interlayers of aluminium foil and filtering paper which form packets and tearing packet with water including the bactericidal additive of polymeric film. Oxidizing mixture has the following composition, %: aluminium foil, 0.02-0.05 mm thick, 3-5; copper sulfate, 30-50; cuprous chloride, 2-5; perlitic sand in grains, 0.1-0.5 mm in diameter, 10-15; flexible polymeric binder, 2-5; water with bactericidal additive, 30-50. Tearing packets with water are arranged between external packet and filtering paper packet. They are provided with two hoses. One hose is secured tightly to external packet face, and the other is fitted with cord at its end passed through opposite face of external packet, the internal surface of which has plastic plates. EFFECT: higher uniformity and duration of temperature maintenance. 4 cl, 3 dwg

Description

 The invention relates to the field of medical equipment, specifically to medical heating pads, which can be used both to restore the thermal state of a supercooled person, and to prevent hypothermia.

 Known mitt-like heating device that generates heat without the consumption of oxygen, consisting of a waterproof envelope, inside which there is a heating layer containing a chemical composition of aluminum metal powder, sodium salts, copper sulfate and an inert filler - talc (1).

 The disadvantage of this heating device is that the chemical composition consists of powdery chemical reagents, which are difficult to mix due to their different densities, which leads to an uneven flow of the chemical reaction, to temperature inconsistency on the heating surface, and reduces safety. Hard mix powder composition degrades manufacturability and workmanship.

 As the closest analogue, an elastic electrochemical heater was selected, containing an external waterproof flat pack, in which several layers of a reaction oxidizing mixture, including an elastic polymer binder, are placed, between the layers there are layers of aluminum foil and porous paper forming packets. In addition, the heater is equipped with a container of a polymer film with water attached to the end of the waterproof package of one of the sides (2). In this case, the "launch" of the device is carried out by crushing the container with water, which is difficult and inconvenient.

 The main task to which the invention is directed is to ensure reliability by uniformly and continuously maintaining the temperature on the surface of the heating pad, improving manufacturability, safety and ease of use.

The problem is solved by the proposed thermochemical hot-water bottle containing an external waterproof flat bag, in which several layers of a reaction oxidizing mixture are placed, including an elastic polymer binder, with layers of aluminum foil and filter paper forming packets, and a burst bag with water from a polymer film. The reaction oxidizing mixture contains copper sulfate, copper chloride and perlite sand in grains with a diameter of 0.1 - 0.5 mm, water in an explosive bag; includes a bactericidal additive, and aluminum foil has a thickness of 0.02 - 0.05 mm. The reaction oxidizing mixture formed during the oxidation reaction has the following mass composition,%:
Aluminum foil - 3 - 5
Copper sulfate - 30 - 50
Copper Chloride - 2 - 5
Perlite sand - 10 - 15
Flexible polymer binder - 2 - 5
Water with a bactericidal additive - 30 - 50
The layers of the reaction oxidizing mixture of sulfate, copper chloride and perlite sand can be made in the form of flat plates in which the chemical ingredients are bonded with an elastic polymer binder, and in general the entire series of heating layers is wrapped on both sides with filter paper that evenly distributes water on the surface of the heating layers after starting the heating pad.

 Between the outer bag and the bag of filter paper are bursting bags of polymer film, filled with water with a bactericidal additive. In this case, the water bag is made with two sleeves, one of which is tightly fastened to the edge of the outer bag, and the second has a cord at the end that passes through the opposite edge of the outer bag. When the cord is pulled, the packet breaks between the sleeves, water is poured out of it into the heating pad and the latter is launched.

 On the inner surface of the outer package there are plastic plates that prevent the needle from piercing a number of heating layers when water is injected with a syringe to start the heating pad.

 In FIG. 1 shows the appearance of a thermochemical medical heating pad; FIG. 2 is a section AA, where the arrangement of the heating layers is shown, in FIG. 3 - bursting bag of polymer film. The thermochemical medical Greek contains an external waterproof bag 1 (Fig. 1) with the cord 2 passed out to start the heating pad. Inside the bag there is a series of heating layers in the form of aluminum foil bags 3 (Fig. 2) inserted one into another, on the surface and inside of which are layers of the reaction oxidizing mixture 4 so that the layers 4 and aluminum foil alternate and are separated from each other. Layers 4 are made in the form of flat plates in which the chemical ingredients are bound by an elastic polymer binder. In general, the entire series of heating layers is wrapped on both sides with filter paper 5. Plastic plates are attached to the inner surface of both sides of the waterproof bag 1. Inside the heating pad there are bursting bags 7 made of polymer film filled with water 8 between the filter paper 5 and both sides of the outer bag 1 with a bactericidal additive that prevents bloating of bursting packets from gas evolution of bacteria that have fallen with water. Explosive packages 7 of a polymer film (Fig. 3) have two sleeves 9 and 10, one of which (9) is tightly fastened to the edge of the outer package 1, and the second (10) is bent in the opposite direction and has a cord 2 missed at the end out through the end of the heating pad.

 Thermochemical medical heating pad works and is used as follows. To start the heating pad, all the cords 2 (Fig. 2) are gently pulled to the stop, as a result of which tears and pouring of water on the filter paper 5 occur between the arms of the bursting bags 7, which evenly distributes water on the surface of the outer plates 4. Chemical reagents (sulfuric acid and chloride copper), dissolving, enter the plates 4, on the surface of the first packet 3 of aluminum foil, resulting in a thermochemical oxidation of aluminum, which replaces copper in its salts with heat. After the foil of the first packet 3 corrodes, an aqueous solution of the reagents will begin to flow inside onto the surface of the next packet 3 of the foil and so on until the last packet 3. As a result, the thermochemical reaction gradually stretches in time, which ensures the required duration of the heating pad, uniformity and constant temperature on its surface. If it is necessary to transport heating pads under severe conditions associated with high atmospheric pressure or strong mechanical pressures, heating pads can be made without bursting bags with water. In this case, it is planned to start the heating pad by introducing water with a syringe, while the outer waterproof bag 1 is punctured obliquely with a needle above the plastic plate 6 so that the aluminum foil bags 3 are not punctured. The use of a running heating pad is that it is applied in a cloth case or over underwear to a heated area of the human body. To reduce heat loss in the surrounding space, the heater should be insulated from the outside. The spent heating pad is disposed of.

 The positive effect of using the proposed thermochemical medical heating pad is that, being an autonomous heat source that does not consume oxygen, it can effectively protect from overcooling or warm various parts of the human body, including those places where air access is difficult (airtight workwear , boots, boots, etc.). Simplified “start-up” by pulling the cords increases the convenience of using a heating pad. The manufacture of the reaction mixture in the form of plates, and not in powder, significantly increases the efficiency of the technology for manufacturing heating pads in large-scale and mass production, and allows the use of conveyor technology.

 Prototypes of the developed heating pads were made with four layers of aluminum foil and a reaction mixture and with two bursting bags filled with water with a bactericidal additive (1% solution of potassium permanganate). The technical and medical tests of heating pads showed that in terms of their parameters, the developed heating pads satisfy the requirements and can be used to heat a person when exposed to cold.

Claims (3)

 1. Thermochemical medical hot-water bottle containing an external waterproof flat pack, in which a number of layers of a reaction oxidizing mixture, including an elastic polymer binder, with interlayers of aluminum foil and filter paper, forming packets and a bursting bag of water from a polymer film, is placed, characterized in that the reaction oxidizing mixture contains copper sulfate, copper chloride and perlite sand in grains with a diameter of 0.1 to 0.5 mm, the water in the bursting package includes a bactericidal additive, aluminum foil it has a thickness of 0.02 0.05 mm with the possibility of forming a mixture of the composition, wt. Aluminum foil 3 5
Copper sulfate 30 50
Copper Chloride 2 5
Perlite sand 10 15
Flexible polymer binder 2 5
Water with a bactericidal additive 30 50
2. A heating pad according to claim 1, characterized in that bursting bags of water are placed between the outer bag and the filter paper bag.  3. A heating pad according to claim 1 or 2, characterized in that the bursting bag with water is made with two sleeves, one of which is tightly fastened to the end of the outer bag, and the second has a cord at the end passing through the opposite end of the outer bag.  4. A heating pad according to claim 1, characterized in that plastic plates are placed on the inner surface of the outer package.

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