RU2206074C1 - Method for measuring temperature - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: method involves laying a substrate ribbon with its free side turned to human body surface and the other side bearing temperature-sensitive lining. Change in temperature- sensitive lining color occurs under the temperature influence corresponding to given temperature value. The substrate ribbon having temperature-sensitive lining is fixed on human body surface with its temperature-sensitive lining side turned to human body surface. The temperature-sensitive lining is transferred to the human body surface like transfers pictures. Then, the substrate ribbon is removed. A mixture of thermochromic and/or photochromic paints having color transition points at different temperatures and different tints, and gluing agents added. EFFECT: accelerated continuous temperature measurement method. 3 cl, 2 dwg

Description

 The invention relates to methods for measuring human body temperature and can be used in medical diagnostics, treatment, in particular children, as well as debilitated patients requiring outside help.

 Known methods for measuring temperature by the interaction of a fluid expanding from heat with the walls of a sealed capillary channel. As a result of the interaction, the walls of the channel change their color. The temperature value is judged by the color change of the channel (US patent 4229975, G 01 K 5/08, 1979, Japanese application 3-361696, G 01 K 5/22, 1981).

 A known method of measuring temperature using a temperature indicator containing encapsulated liquid crystal thermosensitive elements with different color and temperature characteristics, placed on a substrate and coated with a protective film (ed. St. USSR 1208485, G 01 K 11/12, 1986).

 Known disposable thermometer for measuring body temperature of a person, in particular children. The thermometer contains a sealed housing with a capillary channel placed inside and a reservoir in communication with it, which is filled with indicator fluid. The liquid expands from the temperature of the person and causes the necessary reaction (color change) of the walls of the capillary channel (RF patent 2112939, G 01 K 5/00, 1998).

 Closest to the claimed invention is a method of measuring temperature by applying on the body of the substrate tape the free side with a heat-sensitive coating applied on its other side, providing under the influence of temperature a color change of the heat-sensitive coating corresponding to a specific temperature (see the Internet at http: / www .miom.boom.ru; listing of the information site at this address on one sheet of 3 copies).

 The essence of the invention is illustrated by drawings, where in Fig.1 is a schematic representation of the proposed indicator thermometer in section on a ribbon substrate, and figure 2 is the same without a ribbon substrate, and a thermometer indicator is mounted on the studied human body. In figures 1 and 2: 1 - tape substrate; 2 - heat-sensitive coating; 3 - the fixative of the sensitive coating 2 after applying it to the test body and 4 - part of the test body.

 A method of measuring temperature includes applying a substrate side to the human body with a free side with a heat-sensitive coating deposited on its other side. Under the influence of temperature, a color change of the heat-sensitive coating corresponding to a specific temperature occurs. The method is characterized in that the substrate-tape with a heat-sensitive coating is applied to the body from the side of the heat-sensitive coating, which is transferred to the human body as a decal. Then, the backing tape is removed.

 A mixture of thermochromic and / or photochromic paints with color transitions at different temperatures and with different color shades with the addition of adhesives is used as a thermosensitive coating.

 Encapsulated liquid crystal thermosensitive elements with different color and temperature characteristics are used as a heat-sensitive coating.

 The heat-sensitive coating is fixed on the body by applying to it from the free surface of the fixative.

 As a fixative, a layer of colorless varnish with a thickness of 0.1-0.02 microns is applied to the heat-sensitive coating on the human body, depending on the duration of use of the heat-sensitive coating: from a single use to several months.

 As the substrate substrate, porous, permeable paper, lavsan and films are used.

 The crystalline components of the thermal paint are ground with a binder before being applied to the substrate tape to a pasty state with an average particle size of 0.8–2.2 μm.

 The heat-sensitive coating on the substrate tape is applied by screen printing.

The temperature is measured in the range of 20-50 ^o With a measurement accuracy of ± 0.1 ^o .

 A variant of the method for measuring temperature involves the use of thermochromic inks, which, under the influence of body temperature, provides a color change for thermochromic paints corresponding to a specific temperature of the human body, and differs in that thermochromic paints are injected under the skin of a person in the form of a tattoo.

 The technical result achieved by the invention consists in increasing the accuracy and speed of displaying a person’s body temperature, as well as the possibility of continuous temperature display for a long time without the use of expensive electronic equipment and out of the hospital, allowing to monitor the treatment process in dynamics, and to increase the safety of temperature indication.

 The indicator thermometer is, for example, a dacron strip 2x10 cm with a thickness of only 0.3 mm. It is enough to attach this strip, for example, to the forehead for 10-15 seconds and remove. The heat-sensitive coating remaining on the human body will change color depending on the value of the human body temperature with an accuracy of 0.1 degrees. Such devices are indispensable for mass vaccination, for example, of children and save up to 90% of the time.

 Absolutely safe, environmentally friendly, sterile, occupy a minimum of space, they can be dropped, have a low manufacturing cost.

For the manufacture of a thermosensitive coating on a substrate tape, a mixture of thermochromic and / or photochromic paints is used, which, under the influence of temperature in the range from 20 to 50 ^o C, changes the color of the thermosensitive coating corresponding to a specific human temperature.

 The manufacturing cost depends on the format of the thermometer, the quality of the paper (substrate), the type of indicator thermal paint, circulation, etc. The coating is carried out in two layers, the outer of which is made of thermochromic and / or photochromic paints with the possibility of changing the color of the coating with different color shades corresponding to certain temperatures of the human body.

 For the manufacture of thermochromic paints, materials based on, for example, cholesteric liquid crystals, consisting of a hydrophilic polymer (for example, polyvinyl alcohol) and a liquid crystal composition of cholesterol esters, can also be used.

 Such a thermochromic material has the property of selective light scattering; the maximum scattering wavelength, i.e., the visible color of the thermochromic material, depends on temperature, which allows it to be used for temperature indication.

 Thermochromic material for increasing the intensity of selective dispersion colors and increasing the accuracy of temperature determination includes cholesterol derivatives, polyvinyl alcohol, and a complexing agent. This material has a high brightness of colors and makes it possible to determine temperatures with high accuracy without additional calibration.

The coating is based on thermochromic and / or photochromic paints in the range of 20-50 ^o With a reversible color change.

 The outer coating layer is applied, for example, in a soft, removable form in the form of an ointment, paste or cream.

Such a thermochromic paint has the ability to change its color when heated from 20 to 50 ^o C and above from blue to bright red.

 For a thermosensitive coating, a mixture of thermochromic paints having color transitions at different temperatures, paints with different color shades is used.

 Another material for a thermosensitive coating is thermocrystals, which are a complex molecular compound in the form of a spiral, which, when the temperature changes, coils or unfolds, moving its rings around its axis. Depending on the angle of rotation of the spiral, the angle of reflection of the light incident on the crystal changes, and it changes its color.

The crystals are able to work in a given mode, i.e. rotate to the desired angle in a certain temperature range. The boundaries of the "activity" of the crystal can lie in the range from 30 to 80 ^o C or be narrowed to 0.1 ^o C.

 Since crystals are grouped in any configuration, temperature values can be indicated by numbers or any other symbols. Hence the expansion of their scope. It is often necessary to know not the exact value of the temperature, but its acceptable range according to the principle "below the norm - above the norm".

The proposed method allows to obtain a temperature picture on an area of up to 300 cm ² . In this case, no intervention is required in the body: it is enough to just attach this substrate tape to the right place and remove it. The color of the temperature sensitive element will change depending on the temperature.

 To ensure long-term use of the indicator thermometer deposited on the human body, and abrasion resistance, the heat-sensitive coating 2 is covered with a layer of fixative 3, for example, a layer of colorless varnish with a thickness of 0.1-0.002 μm, depending on the duration of use of the heat-sensitive coating from a single use to several months (Fig. .2).

A thermo-indicator film for medical thermography TU 88-15313-01-87 with a measurement accuracy of ± 0.1 ^o C and in the temperature range of 20-50 ^o C. can be used as a substrate tape.

 After use, the heat-sensitive coating is easily washed off with a cotton swab dipped in alcohol.

 Thus, the invention allows for the efficiency, continuity and increased convenience of temperature measurement in the treatment of children, as well as weakened and seriously ill patients requiring outside help.

Claims (3)

1. A method of measuring a person’s temperature, in which a substrate is applied to a person’s body with a heat-sensitive coating with different color and temperature characteristics applied to it, and a paste-like mixture of thermochromic and / or photochromic paints with the addition of adhesives with an average particle size is used as a heat-sensitive coating 0.8-2.2 mm and a temperature measurement in the range of 20-50 ^o C with a measurement accuracy ± 0,1 ^o C, in turn with a thermosensitive coating tape applied to the substrate body with Storo s of a heat-sensitive coating, which is transferred to the body as a decal with the removal of the substrate tape, while additionally fixing the heat-sensitive coating on the body by applying to it from the free surface of the fixative with a thickness of 0.02-0.1 mm, depending on the duration of use from single to several months.  2. The method according to claim 1, in which the heat-sensitive coating on the substrate tape is applied by screen printing, and porous, permeable paper, polyester or film is used as the substrate tape.  3. A method of measuring human temperature, in which thermochromic paints with different color and temperature characteristics are used by entering them under human skin.

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