CN105675166A - Disposable thermometer - Google Patents

Abstract

The invention discloses a disposable thermometer, which is mainly used for measuring body temperature. The selected materials of the thermometer are all organic matter, which can be incinerated after use. The present invention uses different phase change materials to undergo phase change at different temperatures to characterize body temperature. The phase change material is a mixture of any two of n-nonadecane to n-tetracosane, and the thermometer container material is polypropylene, polypropylene, etc. Transparent plastic materials such as vinyl. Arrangement shapes of phase change materials include linear shape, ring shape and array shape. The disposable thermometer of the present invention is inexpensive, non-sterilizable and easy to dispose of.

Description

a disposable thermometer

technical field

The invention relates to a disposable thermometer.

Background technique

There are three types of medical thermometers, glass mercury thermometers, electronic thermometers and ear thermometers. Three kinds of thermometers are all expensive, and cannot be used in one go. Reusable thermometers need to be disinfected after each use. If the disinfection work is not in place, it may lead to cross-infection.

After searching, it is found that the currently effective utility model patent for disposable thermometers (application number: CN200610029740) is made using the principle of thermal expansion and contraction of liquids, and glass is still used in the selection of materials, and it is also necessary for the treatment of medical waste. classification processing.

Contents of the invention

In order to meet the purpose of a disposable thermometer that is cheap, does not need to be sterilized and is easy to handle, the present invention proposes a disposable thermometer, which uses different phase transition temperatures of different phase transition materials to measure temperature. When measuring body temperature, if the thermometer is in contact with the human body, the phase change material whose phase change temperature is lower than the body temperature will all melt, and recrystallize into regular crystals after cooling, solid-liquid interface, crystal and powder interface or phase change phase The highest temperature corresponding to the variable material is the body temperature.

To achieve the above object, the present invention can be solved through the following technical solutions:

A disposable thermometer of the present invention, the powder of the phase change material is placed in a container of a certain shape made of plastic, and the appearance of the phase change material is changed through the phase change of the phase change material with different phase change temperatures to generate an interface and recrystallization changes to indicate body temperature.

As the preferred technical solution of the present invention:

In the disposable thermometer of the present invention, the temperature measurement range of the body temperature is 35-42°C, and the temperature accuracy is 0.1-0.5°C.

In the disposable thermometer of the present invention, the phase change material is a mixture of any two of n-nonadecane to n-tetracosane.

The phase change material of the present invention is a mixture of n-eicosane and n-docosane, and the corresponding relationship between its temperature and molar ratio is:

In the disposable thermometer of the present invention, the particle size range of the phase change material powder is 0.0001-2mm.

In the disposable thermometer of the present invention, the container material includes polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, polymethyl methacrylate, polycarbonate, polystyrene, polyethylene Butyl alcohol, poly(styrene-co-acrylonitrile), acrylonitrile-butadiene-styrene copolymer, polyethersulfone or PETG.

In the disposable thermometer of the present invention, the certain shape includes a linear shape, the diameter of the linear shape is 1-8 mm, and the length of the scale area is 2-4 cm.

In the disposable thermometer of the present invention, a handle is connected to one end of the container, and the length of the handle is 1-10 cm.

In the disposable thermometer of the present invention, the phase change of the phase change material occurs to a solid-liquid phase change; the method for characterizing the body temperature is the solid-liquid interface generated after the complete phase change of the phase change material or the crystal after recrystallization The highest temperature corresponding to the interface with the powder.

Beneficial effect

The disposable thermometer of the invention has the advantages of low cost, no need for disinfection, safe use and easy handling.

Description of drawings

Below according to accompanying drawing and specific embodiment, the present invention will be further described:

Fig. 1 is a structural representation of the present invention

detailed description

Example 1

Melt and mix n-eicosane and n-docosane in different proportions to form a mixture of different phase transition temperatures, and then crush the mixture in order from low temperature to high temperature and fill it in a tube with a diameter of 8mm from bottom to top. In the linear transparent polypropylene tube (shown in Figure 1), the scale part is 4cm, the temperature range is 35-42°C, and the temperature accuracy is 0.2°C. After filling, the upper end is sealed with cotton, and finally melted and sealed.

Table 1. Correspondence between composite phase change materials and temperature

Wherein, the ratio in the table is the molar ratio.

When measuring body temperature, put the scale part of the thermometer into the armpit, or place it in the mouth, or insert it into the anus, and the scale part of the thermometer should be completely submerged. Take it out after one minute, and the temperature corresponding to the completely melted place is the body temperature. After the thermometer is cooled, the phase change material in the thermometer recrystallizes, and the boundary line between the crystallization area and the powder area is the body temperature.

After the thermometer is used, it can be collected centrally for incineration.

Example 2

Melt and mix n-hecodecane and n-tricosane in different proportions, other filling conditions, use and incineration are the same as in Example 1, and the corresponding relationship between the ratio of the composite phase change material and the temperature is the same as in Table 1.

Example 3

Melt and mix n-nonadecane and n-tetracosane in different proportions, other filling conditions, use and incineration are the same as in Example 1, and the corresponding relationship between the ratio of the composite phase change material and the temperature is the same as in Table 1.

However, the above-mentioned specific implementations are only exemplary, and are for better understanding of this patent by those skilled in the art, and cannot be interpreted as limiting the scope of this patent; as long as any Equivalent changes or modifications all fall within the scope of this patent.

Claims (9)

1. a disposable thermometer, it is characterized in that: phase-change material powder is positioned in the container of the definite shape that plastics are made, by have the phase-change material of different phase transition temperature undergo phase transition generation separating surface or again crystallization make phase-change material outward appearance change to characterize body temperature.

2. disposable thermometer according to claim 1, it is characterised in that: the temperature-measuring range of described body temperature is 35～42 DEG C, and temperature accuracy is 0.1～0.5 DEG C.

3. disposable thermometer according to claim 1, it is characterised in that: described phase-change material is the mixture of any two mixing in AI3-36122～n-tetracosane.

4. require the disposable thermometer described in 3 according to claim, it is characterised in that: described phase-change material is the mixture of AI3-28404 and n-docosane, and the corresponding relation of its temperature and molar ratio is:

5. disposable thermometer according to claim 1, it is characterised in that: described phase-change material powder diameter ranges for 0.0001～2mm.

6. disposable thermometer according to claim 1, it is characterised in that: described container material includes polyethylene, polypropylene, polrvinyl chloride, polyethylene terephthalate, polymethyl methacrylate, Merlon, polystyrene, polyvinyl alcohol contracting butyl ester, poly-(styrene-co-acrylonitrile), acrylonitrile-butadiene-styrene copolymer, polyether sulfone or PETG.

7. disposable thermometer according to claim 1, it is characterised in that: described definite shape is linear, and linear, diametrical is 1～8mm, and scale area length is 2～4cm.

8. disposable thermometer according to claim 1, it is characterised in that: one end of described container is connected to handle, and decreased food is 1～10cm.

9. the disposable thermometer described in claims 1, it is characterised in that: what described phase-change material occurred becomes solid-liquid phase change mutually; The method of described sign body temperature is the maximum temperature corresponding to separating surface of crystal and powder after the solid-liquid interface or recrystallization produced after phase-change material undergoes phase transition completely.