Structure for improving measurement accuracy of ear thermometer and control method thereof

Abstract

The invention discloses a structure for improving the measurement accuracy of an ear thermometer and a control method thereof.The structure comprises a thermometer body and an earmuff support assembly, the earmuff support assembly comprises an earmuff support A matched with the thermometer body and an earmuff support B connected with the small end of the earmuff support A, and the earmuff support B is a metal piece; a temperature measuring sensor and a ceramic heating piece are sequentially arranged in the earcap support B from the small end to the large end, and a heat insulation pad is arranged between the ceramic heating piece and the temperature measuring sensor. The device has the advantages of being simple in structure, sensitive in reaction, high in stability and high in measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a structure for improving the measurement accuracy of an ear thermometer and a control method thereof. Background Art

[0002] The ear thermometer consists of a gun body and a temperature probe. The temperature probe is equipped with a device for detecting the infrared spectrum emitted by the eardrum (equivalent to the hypothalamus) to determine the body temperature. In actual use, the temperature probe needs to be inserted into the human ear canal for measurement. The infrared rays emitted by the eardrum are received by the infrared sensor and converted into voltage signals and transmitted to the processing device, which outputs the relative body temperature value after calculation.

[0003] When measuring in winter or other cold environments, the internal temperature of the human ear canal is significantly different from the temperature of the temperature probe. After the temperature probe enters the ear canal, a cooling effect will occur, causing unstable measurement of the temperature probe and large errors. To address this problem, existing ear thermometer products use a preheating solution, such as the Braun IRT6525 ear thermometer from Germany.

[0004] However, when the machine is just turned on for measurement, the temperature of the probe plastic part (earmuff bracket) that is in direct contact with the ear canal is often lower than the normal temperature of the human body surface (preset temperature). The control board heats the probe, and the temperature sensor in the probe senses that the surrounding temperature has reached the normal temperature of the human body surface (preset temperature). The control board stops heating, but the probe plastic part that is in direct contact with the ear canal has not yet reached the normal temperature of the human body surface, so the measurement will be inaccurate when the machine is just turned on.

[0005] For example, the WelchAllyn ear thermometer Pro6000 with high measurement accuracy has a metal film on the probe plastic part (earmuff bracket), but the process of bonding the metal film with the probe plastic part is relatively complicated. Therefore, we urgently need an ear thermometer with a simple structure, sensitive response and high measurement accuracy. Summary of the invention

[0006] In view of the problem that the ear thermometer probe in the prior art is unstable and has errors in measuring ear temperature under different ambient temperatures, the present invention aims to provide a structure and a control method for improving the measurement accuracy of the ear thermometer. The structure has the advantages of simple structure, sensitive response, high stability and high measurement accuracy.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is: a structure for improving the measurement accuracy of an ear thermometer, comprising a gun body and a temperature measuring probe assembly, wherein the temperature measuring probe assembly comprises an earmuff bracket assembly, the earmuff bracket assembly comprises an earmuff bracket A mounted in cooperation with the gun body and an earmuff bracket B connected to the small end of the earmuff bracket A, and the earmuff bracket B is a metal part.

[0008] In the aforementioned structure for improving the measurement accuracy of an ear thermometer, a ceramic heating element, a thermal insulation pad and a temperature sensor are sequentially arranged in the earmuff bracket B from the large end to the small end, and the thermal insulation pad is a non-metallic insulating material.

[0009] In the aforementioned structure for improving the measurement accuracy of the ear thermometer, heat conduction is facilitated, and the gaps between the ceramic heating element, the thermal insulation pad, the temperature sensor and the earmuff bracket B are completely filled and fixed with thermal conductive glue.

[0010] In the aforementioned structure for improving the measurement accuracy of an ear thermometer, the ceramic heating element is a ceramic heating sheet or a ceramic heating ring.

[0011] The aforementioned control method of a structure for improving the measurement accuracy of an ear thermometer: when the ear thermometer is turned on, the control circuit board controls the ceramic heating element to heat up, and the ceramic heating element transfers the heat to the earmuff bracket B, and the earmuff bracket B then transfers the heat to the temperature sensor. When the temperature sensor measures that the temperature of the earmuff bracket B reaches the preset target temperature (generally, the normal temperature of the human body surface is close to 37.2 degrees Celsius), the control circuit board stops heating the ceramic heating element; when the temperature sensor measures that the temperature of the earmuff bracket B is lower than the preset target temperature, the control circuit board controls the ceramic heating element to heat up, and repeats in sequence to ensure that the temperature of the earmuff bracket B is always the preset target temperature. In this way, the heat radiated by the eardrum will not be lost, so that the output voltage accurately corresponds to the temperature of the human body. Compared with the prior art, the present invention adds a heat insulation pad, thereby effectively improving the accuracy of the detected human body temperature;

[0012] Furthermore, the earmuff bracket of the present invention is divided into an earmuff bracket A and an earmuff bracket B, wherein the earmuff bracket B is a metal part, and the heat conduction of the metal part is more sensitive;

[0013] Furthermore, the ceramic heating element of the present invention is a ceramic heating sheet or a ceramic heating ring, which has a faster heating speed and higher stability.

[0014] In summary, the present invention has the advantages of simple structure, sensitive response, high stability and high measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the ear thermometer of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the temperature measuring probe assembly of the present invention;

[0017] Figure 3 The present invention Figure 2 A partial enlarged view of point A;

[0018] Figure 4 This is a schematic diagram of the structure of a temperature measuring probe assembly according to Embodiment 1 of the present invention;

[0019] Figure 5 It is a schematic diagram of the structure of the temperature measuring probe assembly of embodiment 2 of the present invention.

[0020] The markings in the attached figure are: 1. gun body; 2. temperature probe assembly; 20. earmuff bracket assembly; 21. earmuff bracket; 21.1. earmuff bracket A; 21.2. earmuff bracket B; 22. temperature sensor; 23. ceramic heating element; 23.1. ceramic heating sheet; 23.2. ceramic heating ring; 24. thermal insulation pad; 25. thermal conductive glue. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Example 1

[0023] A structure for improving the measurement accuracy of an ear thermometer, such as Figure 1-3 As shown, it includes a gun body 1 and a temperature measuring probe assembly 2 connected to the top of the gun body 1, the temperature measuring probe assembly 2 includes an earmuff bracket assembly 20, the earmuff bracket assembly 20 includes an earmuff bracket A 21.1 installed in conjunction with the gun body 1 and an earmuff bracket B 21.2 connected to the small end of the earmuff bracket A 21.1, the earmuff bracket B 21.2 is a metal part, preferably, the metal part is made of nickel-plated copper, copper has good thermal conductivity and stable performance, the nickel plating is corrosion-resistant, wear-resistant, dense, can fill the fine pores and protrusions on the copper surface, and improve the bonding strength between metals.

[0024] The earmuff bracket A 21.1 and the earmuff bracket B 21.2 both have a truncated cone shape. A temperature sensor 22 and a ceramic heating element 23 are arranged inside the earmuff bracket B21.2 from the small end to the large end. An insulating pad 24 is arranged between the ceramic heating element 23 and the temperature sensor 22. The insulating pad 24 is a non-conductive material, such as a polyimide film.

[0025] The ceramic heating element 23, the thermal insulation pad 24 and the temperature sensor 22 are installed on the outer circumference of the earmuff bracket B21.2, and the inner circumference of the earmuff bracket B21.2 in contact with them is coated with thermal conductive glue 25, that is, the ceramic heating element 23, the thermal insulation pad 24, the temperature sensor 22 and the earmuff bracket B21.2 are in contact with each other without any gap.

[0026] The ceramic heating element 23 is a ceramic heating plate 23.1, on which a small wire avoidance hole is provided. The thickness h1 of the ceramic heating plate 23.1 is 1-2 mm, and the ceramic heating plate 23.1 has a small volume, a fast heating speed and high stability.

[0027] The height of the earmuff bracket B 21.2 is 9-12mm, which is to make the heat conduction faster and shorter, and at the same time it needs to conform to the design of the human ear canal so that it can contact and fit the ear canal.

[0028] Example 2

[0029] A structure for improving the measurement accuracy of an ear thermometer, such as Figure 4 As shown, the difference from Example 1 is that the ceramic heating element 23 is a ceramic heating ring 23.2, the thickness of the ceramic heating ring 23.2 is 1-2mm, the height h2 is 3-6mm, and its height can be flush with the bottom of the earmuff bracket B 21.2. In this way, the contact area between the ceramic heating ring 23.2 and the earmuff bracket B 21.2 is larger, the heat conduction effect is better, and at the same time the volume of the ceramic heating ring is reduced as much as possible, so that it heats up faster.

[0030] Preheating control method of ear thermometer: When the ear thermometer is turned on, the control circuit board controls the ceramic heating element 23 to heat up, and the ceramic heating element 23 transfers the heat to the earmuff bracket B 21.2, and the earmuff bracket B 21.2 then transfers the heat to the temperature sensor 22. When the temperature sensor 22 detects that the temperature of the earmuff bracket B 21.2 reaches the preset target temperature (generally the normal temperature of the human body surface is close to 37.2 degrees Celsius), the control circuit board stops heating the ceramic heating element 23; when the temperature sensor 22 detects that the temperature of the earmuff bracket B 21.2 is lower than the preset target temperature, the control circuit board controls the ceramic heating element 23 to heat up, and repeats in sequence to ensure that the temperature of the earmuff bracket B 21.2 is always the preset target temperature. In this way, the heat radiated by the eardrum will not be lost, so that the output voltage accurately corresponds to the temperature of the human body, thereby effectively improving the accuracy of the detected human body temperature.

Claims

1. A structure for improving the measurement accuracy of an ear thermometer, characterized in that: The invention comprises a gun body (1) and a temperature measuring probe assembly (2) connected to the top of the gun body (1), wherein the temperature measuring probe assembly (2) comprises an earmuff bracket assembly (20), and the earmuff bracket assembly (20) comprises an earmuff bracket (21) mounted in cooperation with the gun body (1), wherein the earmuff bracket (21) has a truncated cone shape, and a temperature measuring sensor (22) and a ceramic heating element (23) are arranged in sequence from the small end to the large end inside, and a heat insulating pad (24) is arranged between the ceramic heating element (23) and the temperature measuring sensor (22).

2. A structure for improving the measurement accuracy of an ear thermometer according to claim 1, characterized in that: The earmuff bracket (21) comprises an earmuff bracket A (21.1) and an earmuff bracket B (21.2) connected to the small end of the earmuff bracket A (21.1), and the material of the earmuff bracket B (21.2) is metal.

3. A structure for improving the measurement accuracy of an ear thermometer according to claim 2, characterized in that: The gaps between the ceramic heating element (23), the heat insulating pad (24), the temperature sensor (22) and the earmuff bracket B (21.2) are completely filled with heat conductive glue (25).

4. A structure for improving the measurement accuracy of an ear thermometer according to claim 2, characterized in that: The material of the earmuff bracket B (21.2) is nickel-plated copper.

5. A structure for improving the measurement accuracy of an ear thermometer according to claim 2, characterized in that: The length of the earmuff bracket B (21.2) is 9-12 mm.

6. A structure for improving the measurement accuracy of an ear thermometer according to claim 3, characterized in that: The ceramic heating element (23) is a ceramic heating sheet (23.1).

7. A structure for improving the measurement accuracy of an ear thermometer according to claim 6, characterized in that: The thickness of the ceramic heating plate (23.1) is 1-2 mm.

8. The structure for improving the measurement accuracy of an ear thermometer according to claim 3, characterized in that: The ceramic heating element (23) is a ceramic heating ring (23.2).

9. A structure for improving the measurement accuracy of an ear thermometer according to claim 8, characterized in that: The height of the ceramic heating ring (23.2) is 3-6 mm.

10. A control method for a structure for improving the measurement accuracy of an ear thermometer according to any one of claims 1 to 9, characterized in that: When the ear thermometer is turned on, the control circuit board controls the ceramic heating element (23) to heat up, and the ceramic heating element (23) transfers the heat to the earmuff bracket B (21.2), and the earmuff bracket B (21.2) then transfers the heat to the temperature sensor (22). When the temperature sensor (22) detects that the temperature of the earmuff bracket B (21.2) reaches a preset target temperature, the control circuit board stops heating the ceramic heating element (23); when the temperature sensor (22) detects that the temperature of the earmuff bracket B (21.2) is lower than the preset target temperature, the control circuit board controls the ceramic heating element (23) to heat up, and the process is repeated in sequence to ensure that the temperature of the earmuff bracket (21.2) B is always at the preset target temperature.

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