Acetone sensor and diabetes detector beneficial to miniaturization and portability

Abstract

The acetone sensor comprises a base body, a detection electrode and a gas-sensitive material, a groove is formed in the upper edge of the base body, the detection electrode is arranged in the groove, the groove is filled with the gas-sensitive material, the gas-sensitive material wraps the detection electrode, a plurality of process grooves are formed in the upper edge of the gas-sensitive material, and the process grooves are communicated with the gas-sensitive material. The detection electrode comprises an upper surface horizontal electrode strip distributed close to the upper edge of the gas sensitive material, a vertical electrode strip distributed close to the side edge of the process tank and a lower surface horizontal electrode strip distributed close to the bottom edge of the process tank; the adjacent upper surface horizontal electrode strips, vertical electrode strips and lower surface horizontal electrode strips are connected in series through connecting electrode plates to form a continuous detection electrode, and the two ends of the detection electrode penetrate out of the opposite sides of the base body respectively. According to the utility model, the space in the diabetes detector is fully utilized by the acetone sensor, so that the miniaturization and portability of the diabetes detector are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor design, in particular to an acetone sensor and a diabetes detector which is conducive to miniaturization and portability. Background Art

[0002] Exhaled breath testing is a new supplementary testing method for diabetes diagnosis, in addition to blood and urine testing. Because the acetone content in exhaled breath is positively correlated with the acetone content in the human body, and acetone is related to the metabolism and esterification of glucose in the human body, the acetone content can be used as an important gas marker for monitoring diabetes, and physicians can diagnose the patient's condition based on the acetone content. Compared with blood and urine testing, exhaled breath testing is safer and more convenient.

[0003] In order to solve the problem of sensing accuracy of gas sensors in the prior art, the applicant's prior application CN202322230042.1 provides an acetone sensor and a detector for acetone content in the exhaled gas of diabetic patients. The detection electrode itself is serpentine, and the side wall is provided with a V-shaped groove and is wavy, so that the contact area between the detection electrode and the gas-sensitive material can be increased, which helps to improve the sensitivity of the detection electrode to signal changes, and thus helps to improve the accuracy of the sensor. However, the applicant found in further research on the technical solution that although the detection electrode in the technical solution is set in a serpentine shape and the side wall is provided with a V-shaped groove to increase the contact area with the gas-sensitive material, the detection electrode as a whole is still arranged in a plane form. This arrangement method results in that, under the premise of ensuring sufficient accuracy of the sensor, the area on the side where the acetone sensing part of the sensor is set to the gas-sensitive material is still large, and thus the cross-sectional area of ​​the airway of the diabetes detector is large, which is not conducive to the miniaturization and portability of the diabetes detector developed based on the acetone sensor. Utility Model Content

[0004] The utility model aims to provide an acetone sensor and a diabetes detector which is conducive to miniaturization and portability, so that the acetone sensor fully utilizes the space in the diabetes detector to realize the miniaturization and portability of the diabetes detector.

[0005] In order to solve the above technical problems, the specific scheme adopted by the utility model is: an acetone sensor, including a substrate, a detection electrode and a gas-sensitive material, a groove is opened on the upper edge of the substrate, the detection electrode is arranged in the groove, the gas-sensitive material is filled in the groove and covers the detection electrode, the upper edge of the gas-sensitive material has a plurality of process grooves, the detection electrode includes an upper horizontal electrode strip distributed near the upper edge of the gas-sensitive material, a vertical electrode strip distributed near the side edge of the process groove, and a lower horizontal electrode strip distributed near the bottom edge of the process groove, the adjacent upper horizontal electrode strips, the vertical electrode strips and the lower horizontal electrode strips are respectively connected in series through connecting electrode sheets to form a continuous detection electrode, and the two ends of the detection electrode respectively pass through the opposite sides of the substrate.

[0006] Preferably, the process groove is a rectangular groove, the groove and the gas-sensitive material are corresponding rectangles, the length direction of the process groove is perpendicular to the length direction of the gas-sensitive material, and all the process grooves are spaced apart along the length direction of the gas-sensitive material.

[0007] Preferably, the upper horizontal electrode strips, the vertical electrode strips and the lower horizontal electrode strips are all in the shape of long flat plates.

[0008] Preferably, the upper horizontal electrode strips, the vertical electrode strips and the lower horizontal electrode strips are all wavy in shape.

[0009] Preferably, a first ventilation hole is opened through the substrate, and a second ventilation hole corresponding to the first ventilation hole is opened through the gas-sensitive material. The second ventilation hole is located at the bottom of the process tank and between the adjacent vertical electrode strips and the lower horizontal electrode strip.

[0010] Preferably, the gas-sensitive material is made of tin dioxide nanomaterial or tungsten trioxide nanomaterial, the detection electrode is made of gold, silver or copper, and the substrate is made of insulating plastic.

[0011] Preferably, the upper horizontal electrode strips, the vertical electrode strips, the lower horizontal electrode strips and the corresponding connecting electrode sheets are integrally formed and manufactured.

[0012] A diabetes detector that is conducive to miniaturization and portability, comprising a detection shell, a power supply and a detection circuit board arranged in the detection shell, an air intake channel being arranged in the air intake channel, any one of the above-mentioned acetone sensors being arranged in the air intake channel, a gas-sensitive material of the acetone sensor being distributed toward the inlet end of the air intake channel, and a detection electrode of the acetone sensor being electrically connected to the detection circuit board.

[0013] Beneficial Effects

[0014] The gas-sensitive material in the utility model is provided with a plurality of process grooves, and the detection electrodes are continuously and bently distributed along the upper edge of the gas-sensitive material, the side edge of the process groove and the bottom edge of the process groove, so that the sensing surface and the detection electrodes of the gas-sensitive material of the utility model form a three-dimensional spatial structure. Through the above arrangement, on the one hand, the upper surface of the gas-sensitive material in the utility model and the surface of the bottom and side of the corresponding process groove can contact and react with the exhaled air to be tested, which is convenient for reducing the area of ​​the gas-sensitive material side in the acetone sensor, thereby reducing the cross-sectional area of ​​the air inlet duct occupied by the acetone sensor in the diabetes detector; on the other hand, the detection electrodes are distributed on the upper surface of the gas-sensitive material and the inside of the side and bottom positions of the process groove, and the contact area between the gas-sensitive material and the detection electrode can be increased in the spatial structure, which helps to improve the sensitivity of the detection electrode to signal changes. As a result, while the acetone sensor disclosed in the utility model and CN202322230042.1 achieve the same detection sensitivity and accuracy, the acetone sensor of the utility model has a smaller area on the gas-sensitive material side, can make more full use of the longitudinal space of the internal air intake channel of the diabetes detector, and is conducive to the miniaturization and portability of the diabetes detector.

[0015] In a further preferred embodiment of the present invention, a first vent hole and a second vent hole are correspondingly provided on the gas and the gas-sensitive material, and the second vent hole on the gas-sensitive material is located at the bottom of the process tank, so as to facilitate the exhaled air to flow through various positions on the sensing side of the gas-sensitive material, thereby allowing the sensing side of the gas-sensitive material to fully react with the exhaled air, thereby further improving the sensitivity of the acetone sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of Example 1 of the utility model acetone sensor;

[0017] Figure 2 is a schematic structural diagram of the detection electrode part in Example 1;

[0018] Figure 3 for Figure 1 A schematic diagram of a longitudinal cross-sectional structure;

[0019] Figure 4 It is a schematic diagram of a longitudinal cross-sectional structure of a diabetes detector based on the acetone sensor of Example 1;

[0020] Figure 5 This is a schematic structural diagram of Example 2 of the acetone sensor of the utility model;

[0021] Figure 6 for Figure 5 A schematic diagram of a longitudinal cross-sectional structure;

[0022] Markings in the figure: 1. Detection electrode, 101. External electrode strip, 102. Upper horizontal electrode strip, 103. Connecting electrode sheet, 104. Vertical electrode strip, 105. Lower horizontal electrode strip, 2. Substrate, 3. Gas-sensitive material, 4. Process groove, 5. Second air vent, 6. First air vent, 7. Detection shell, 8. Air inlet channel, 9. Blowing nozzle, 10. Filter, 11. Acetone sensor. DETAILED DESCRIPTION

[0023] The following three embodiments are used to illustrate the utility model acetone sensor and diabetes detector:

[0024] Example 1

[0025] This embodiment first provides an acetone sensor 11.

[0026] like Figure 1 As shown, an acetone sensor 11 of this embodiment mainly includes a substrate 2 and a gas-sensitive material 3 and a detection electrode 1 arranged in the substrate 2. The substrate 2 is rectangular and made of insulating engineering plastic. A rectangular groove is provided on the upper edge of the substrate 2 for installing the gas-sensitive material 3 and the detection electrode 1. The gas-sensitive material 3 is a tin dioxide nanomaterial, and three identical process grooves 4 are provided on the upper edge of the gas-sensitive material 3. The process grooves 4 are also rectangular, and the length direction of the process grooves 4 is distributed along the width direction of the substrate 2, and the three process grooves 4 are evenly spaced along the length direction of the substrate 2.

[0027] The material of the detection electrode 1 is silver, combined with Figure 2 As shown, the detection electrode 1 is a three-dimensional space bending structure corresponding to the process groove 4, including a long flat plate-shaped upper horizontal electrode strip 102, a vertical electrode strip 104 and a lower horizontal electrode strip 105. The adjacent upper horizontal electrode strips 102, the vertical electrode strips 104 and the lower horizontal electrode strips 105 are connected in series through the connecting electrode sheet 103, and the two upper horizontal electrode strips 102 located on the outermost sides are respectively provided with an external electrode strip 101, Figure 1 and Figure 3 In the embodiment, the external electrode strip 101 passes through the gas-sensitive material 3 and the substrate 2 to be connected to the external detection circuit board. The upper horizontal electrode strip 102, the vertical electrode strip 104, the lower horizontal electrode strip 105, the connecting electrode sheet 103 and the external electrode strip 101 are integrally formed to ensure structural strength and stable signal transmission.

[0028] like Figure 3As shown, the upper horizontal electrode strip 102, the vertical electrode strip 104 and the lower horizontal electrode strip 105 are all coated in the gas-sensitive material 3, wherein the upper horizontal electrode strip 102 is distributed close to the upper edge of the gas-sensitive material 3, the vertical electrode strip 104 is distributed close to the side wall of the process tank 4, and the lower horizontal electrode strip 105 is distributed close to the bottom of the process tank 4. Compared with the conventional planar arrangement of the gas-sensitive material 3 and the detection electrode 1, the present embodiment has a unit projection area ( Figure 1 On the vertical projection surface in the figure, the same below), the contact area between the gas-sensitive material 3 and the air to be measured is increased. On the other hand, the contact area between the detection electrode 1 and the gas-sensitive material 3 is also increased on the unit projection surface, which helps to improve the sensitivity and detection accuracy of the detection electrode 1 to signal changes. Further, in the case of a smaller unit projection surface, the detection accuracy can be the same as that of the conventional planar-arranged gas-sensitive material 3 and detection electrode 1, thereby making this embodiment more conducive to miniaturization and portability.

[0029] Based on the above acetone sensor 11, this embodiment also proposes a miniaturized and portable diabetes detector.

[0030] The diabetes detector of this embodiment uses the exhaled breath of the test subject to detect the acetone content, so as to characterize the patient's glucose metabolism and esterification level, so as to make a diagnosis based on the test results. Its technical principle and structure are similar to those of the prior patents proposed by the applicant. Figure 4 As shown, the diabetes detector has a detection shell 7, and the detection shell 7 has an air inlet channel 8. The right end of the air inlet channel 8 is connected to a mouthpiece 9 for the patient to exhale. The air inlet channel 8 is provided with a filter 10, an acetone sensor 11, a detection circuit board, a power supply, and an air outlet for gas to pass through in sequence to the left (the detection circuit board, the power supply, and the air outlet are not shown in the figure). The gas-sensitive material 3 side of the acetone sensor 11 is distributed toward the direction of the mouthpiece 9, the external electrode strip 101 of the detection electrode 1 is connected to the detection circuit board, and the outer edge of the substrate 2 and the peripheral wall of the air inlet channel have a gap for the patient to exhale through.

[0031] The difference between this embodiment and the patent cited in the background art is that the diabetes detector of this embodiment is provided with the above-mentioned gas-sensitive material 3 with process groove 4 and acetone sensor 11 with corresponding detection electrode 1. Figure 4 The right side surface of the acetone sensor 11 can be significantly reduced while maintaining the same detection sensitivity and accuracy, so that the cross-sectional area of ​​the air intake duct of the diabetes detector of this embodiment can be smaller, thereby facilitating the miniaturization and portability of the diabetes detector itself while making full use of the longitudinal space of the air intake duct.

[0032] Example 2

[0033] This embodiment provides an acetone sensor 11, the main structure and basic functions of which are the same as those of the acetone sensor 11 in Embodiment 1, except that this embodiment is more conducive to the contact reaction between the patient's exhaled breath and the surface of the gas-sensitive material 3, thereby ensuring the detection sensitivity and accuracy. Specifically:

[0034] like Figure 5 and Figure 6 As shown, in this embodiment, second vent holes 5 are respectively provided on both sides of the bottom of the process tank 4 in the gas-sensitive material 3, and first vent holes 6 corresponding to and connected with the second vent holes 5 are provided on the substrate 2. Therefore, when the patient exhales toward the acetone sensor 11 through the air inlet of the diabetes detector, the gas not only passes through the gap between the acetone sensor 11 and the air inlet, but also can pass through the air path formed by the first vent hole 6 and the second vent hole 5, so that the gas does not produce a situation of being blocked and not flowing in the process tank 4, ensuring the ability of the surface part of the gas-sensitive material 3 corresponding to the side and bottom of the process tank 4 to react with the gas, thereby ensuring the sensitivity and accuracy of the detection.

[0035] Example 3

[0036] This embodiment does not provide drawings, and is a further improvement on the acetone sensor 11 of embodiments 1 and 2. The detection electrodes 1 in embodiments 1 and 2 are both in the shape of long strips and flat plates. The upper horizontal electrode strips 102, the vertical electrode strips 104, and the lower horizontal electrode strips 105 in the detection electrode 1 in this embodiment are similar to those in the scheme involved in the background technology, and are all provided with V-shaped grooves along their own thickness direction on the side to form a wavy shape, thereby further increasing the contact area between the detection electrode 1 and the gas-sensitive material 3, and further improving the sensor sensitivity and detection accuracy on the unit projection surface.

Claims

1. An acetone sensor, comprising a substrate (2), a detection electrode (1) and a gas-sensitive material (3), wherein a groove is provided on the upper edge of the substrate (2), the detection electrode (1) is arranged in the groove, and the gas-sensitive material (3) is filled in the groove and covers the detection electrode (1), characterized in that: The upper edge of the gas-sensitive material (3) is provided with a plurality of process grooves (4); the detection electrode (1) comprises an upper horizontal electrode strip (102) distributed near the upper edge of the gas-sensitive material (3), a vertical electrode strip (104) distributed near the side edge of the process groove (4), and a lower horizontal electrode strip (105) distributed near the bottom edge of the process groove (4); adjacent upper horizontal electrode strips (102), vertical electrode strips (104), and lower horizontal electrode strips (105) are respectively connected in series via a connecting electrode sheet (103) to form a continuous detection electrode (1); and two ends of the detection electrode (1) respectively pass through opposite sides of the substrate (2).

2. An acetone sensor as claimed in claim 1, characterized in that: The process groove (4) is a rectangular groove, the groove and the gas-sensitive material (3) are corresponding rectangles, the length direction of the process groove (4) is perpendicular to the length direction of the gas-sensitive material (3), and all the process grooves (4) are spaced apart along the length direction of the gas-sensitive material (3).

3. An acetone sensor as claimed in claim 2, characterized in that: The upper horizontal electrode strip (102), the vertical electrode strip (104) and the lower horizontal electrode strip (105) are all in the shape of long flat plates.

4. An acetone sensor as claimed in claim 2, characterized in that: The shapes of the upper horizontal electrode strips (102), the vertical electrode strips (104) and the lower horizontal electrode strips (105) are all wavy.

5. An acetone sensor as claimed in claim 1, characterized in that: A first ventilation hole (6) is formed through the substrate (2), and a second ventilation hole (5) corresponding to the first ventilation hole (6) is formed through the gas-sensitive material (3). The second ventilation hole (5) is located at the bottom of the process tank (4) and between the adjacent vertical electrode strips (104) and the lower horizontal electrode strips (105).

6. An acetone sensor as claimed in claim 1, characterized in that: The material of the gas-sensitive material (3) is tin dioxide nanomaterial or tungsten trioxide nanomaterial, the material of the detection electrode (1) is gold, silver or copper, and the material of the substrate (2) is insulating plastic.

7. An acetone sensor as claimed in claim 1, characterized in that: The upper horizontal electrode strip (102), the vertical electrode strip (104), the lower horizontal electrode strip (105) and the corresponding connecting electrode sheet (103) are integrally formed and manufactured.

8. A miniaturized and portable diabetes detector, comprising a detection housing (7) and a power supply and a detection circuit board arranged in the detection housing (7), characterized in that: An air intake passage (8) is provided in the detection housing (7), and an acetone sensor (11) according to any one of claims 1 to 7 is further provided in the air intake passage (8), a gas-sensitive material (3) of the acetone sensor (11) is distributed toward the inlet end of the air intake passage (8), and a detection electrode (1) of the acetone sensor (11) is electrically connected to a detection circuit board.

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