Electronic rapid detection device

Abstract

The utility model discloses an electronic type quick detection device, belongs to in vitro sample detection technical field, including detection subassembly, sampling subassembly and sample bin, detection subassembly is connected with sample bin, the sampling subassembly is provided in the sample bin, detection subassembly includes detection part and reagent strip, the detection part is connected with the sample bin. One part of the reagent strip is located in the sample bin, the other part of the reagent strip extends into the detection assembly, the detection component is arranged in the detection assembly and comprises a detection main board and a photoelectric detection element, the photoelectric detection element is arranged on the detection main board, the detection main board is arranged in the detection assembly, and the photoelectric detection element is arranged on the detection main board. According to the kit, the detection of the sample is completed through the closed sample bin, the operation steps are clear and reliable, errors caused by human recognition are reduced, and the kit is suitable for being used by non-professionals.

Description

Technical Field

[0001] The utility model relates to the technical field of in vitro sample detection, in particular to an electronic rapid detection device. Background Art

[0002] In vitro testing is widely used due to its convenience and accuracy. Among them, fecal testing can be used for auxiliary diagnosis of various diseases, such as: gastrointestinal bleeding can be caused by various diseases. By detecting hemoglobin or transferrin in the feces, it can be used to check whether the subject has gastrointestinal bleeding; Helicobacter pylori is a Gram-negative helicobacter that parasitizes the human gastric mucosa and is related to the occurrence of various gastrointestinal diseases such as gastric cancer and gastric ulcers. By detecting Helicobacter pylori-related antigens in feces, it can be determined whether the subject is infected with Helicobacter pylori; Rotavirus and adenovirus are both important causes of diarrhea in children. By detecting rotavirus / adenovirus-related antigens in feces, it can be determined whether the subject is infected with rotavirus / adenovirus. At present, fecal testing usually requires the subject to collect the feces and hand it over to medical staff for testing. It takes a long waiting time for the results to appear, which is not convenient, resulting in low compliance with fecal testing and a high abandonment rate. In order to reduce the difficulty of fecal processing and the requirements of the environment for testing, a flexible detection device is needed.

[0003] The existing patent application with publication number CN107667290A discloses a lateral flow detection device, a kit or an instrument comprising the detection device, and a method for quantitatively detecting an analyte in a saliva sample using the detection device, the kit or the instrument, for example, a saliva sample from a subject, for example, to determine hormones, ovulation, pregnancy and / or fertility for a user, for example, to perform hormone, ovulation, pregnancy, fertility status, time window, trend, or treatment monitoring or guidance for a user. The detection device is not closed to use and manual operation is cumbersome. Utility Model Content

[0004] The utility model aims to provide an electronic rapid detection device, which solves the problems of the existing in vitro detection device that the sample chamber is not sealed and is prone to leakage and difficult to operate.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] An electronic rapid detection device comprises a detection component, a sampling component and a sample chamber, wherein the detection component is connected to the sample chamber, the sampling component is arranged in the sample chamber, the detection component comprises a detection part and a reagent strip, a part of the reagent strip is in the sample chamber, and the other part extends into the detection component, the detection component is arranged in the detection component, the detection part comprises a detection mainboard and a photoelectric detection element, the photoelectric detection element is arranged on the detection mainboard, the detection mainboard is arranged in the detection component, the detection element is opposite to the other part of the reagent strip, the sample detection is completed through the closed sample chamber, the operation steps are clear and reliable, the error of human recognition is reduced, and it is suitable for use by non-professionals.

[0007] Furthermore, the detection component also includes a trigger electrode, one end of which is in contact with the reagent strip and the other end is connected to the detection main board, which clarifies the operation steps and increases the service life of the electronic rapid detection device.

[0008] Furthermore, the detection component also includes a display screen, which is arranged on the detection main board, and also includes a side cover, which is arranged on the side wall of the detection component. The side cover is provided with an observation window, and the display screen is opposite to the observation window. The detection result is converted into a human-readable form through the display screen, thereby reducing errors in human recognition and improving the accuracy of detection.

[0009] Preferably, the detection component also includes a power supply element, an MCU and a wireless communication module. The power supply element, the MCU and the wireless communication module are all arranged on the detection mainboard, and the detection results can be transmitted to an external device to facilitate remote diagnosis and information tracing.

[0010] More preferably, the detection component further includes a buzzer, and the buzzer is arranged on the detection main board, which can convey more detection information to people.

[0011] Furthermore, it also includes a piston and a bottom cover, the piston is slidably connected in the sample chamber, the bottom cover is arranged at the ends of the detection component and the sample chamber, the sample chamber includes a dilution chamber and a sample input channel, the dilution chamber is arranged in the sample chamber, the sample input channel is arranged on the inner wall of the sample chamber, one end of the sample input channel is connected to the dilution chamber, and the other end extends into the bottom cover, the piston controls the connection state of the sample input channel, fully dilutes the sample, and the operation steps are clearly separated, which reduces the difficulty of operation and improves the accuracy of identification.

[0012] Preferably, the piston comprises a circulation portion and a sealing portion, and both the circulation portion and the sealing portion are arranged on the outer wall of the piston, thereby improving the sealing performance of the dilution chamber.

[0013] Furthermore, the bottom cover includes a top post and a buffer cavity, the buffer cavity is arranged in the bottom cover, the top post is arranged in the buffer cavity, and the top post can contact with the piston to ensure that the sample solution is in full contact with the reagent strip.

[0014] Preferably, the sample chamber further comprises a partition chamber and a partition wall, wherein the partition wall is arranged in the sample chamber to separate the sample chamber into the partition chamber and the dilution chamber which are communicable, so as to prevent leakage of the sample and quantify the sample.

[0015] Furthermore, it also includes a connecting block arranged between the detection component and the sample chamber, the sampling component includes a sampling part, a sampling cover, a sampling rod, a first positioning groove and a second positioning groove, one end of the sampling rod is connected to the sampling part, and the other end is connected to the sampling cover, the first positioning groove and the second positioning groove are sequentially arranged on the sampling cover along the axial direction of the sampling rod, and the first positioning groove and the second positioning groove are connected, the connecting block cooperates with the first positioning groove and the second positioning groove respectively to limit the depth of the sampling part entering the sample chamber, each operation has accurate positioning, which reduces the difficulty of operation and improves the accuracy of sample identification.

[0016] The beneficial effects of the utility model are:

[0017] (1) The electronic rapid detection device is provided with a detection component and a sample chamber. The sampling component takes samples from the in vitro sample and places them into the sample chamber for dilution and mixing. A reagent strip is provided between the detection component and the sample chamber. After the reagent strip contacts the sample in the sample chamber, a color reaction occurs. The detection component reads the detection result through a contactless photoelectric reaction and can store, display and transmit the result to the outside. The sampled sample is sealed in the sample chamber to prevent external contamination. After sampling, the detection component reads the sample, which reduces the error of manual sample reading. The device can be operated and used by non-professionals. It is flexible, safe and accurate to use.

[0018] (2) The electronic rapid detection device is provided with a trigger electrode, which contacts the reagent strip. After the sample in the reagent strip is fully soaked, the trigger electrode is turned on and the detection component is powered on and activated, so that the detection device can be used for a long time without worrying about power failure, making it easy to observe the operation steps and reducing the difficulty of use.

[0019] (3) The sample chamber of the electronic rapid detection device is provided with a piston and a sample delivery channel, the sample delivery channel connects the dilution chamber and the reagent strip, the piston can control the on and off of the sample delivery channel, and the contact between the sample and the reagent strip can be controlled by manually pressing the piston, which can facilitate the operation to fully mix the sample and ensure the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An exploded view of the electronic rapid detection device provided by the utility model;

[0021] Figure 2 An axonometric diagram of the electronic rapid detection device provided by the utility model;

[0022] Figure 3 A front view of the electronic rapid detection device provided by the utility model;

[0023] Figure 4 This is a side view of the electronic rapid detection device provided by the utility model.

[0024] Figure 5 for Figure 4 Section view along line AA;

[0025] Figure 6 for Figure 5 Sectional view along line BB;

[0026] Figure 7 for Figure 5 Sectional view along the CC line;

[0027] Figure 8 An axonometric diagram of the sample bin provided by the utility model;

[0028] Fig. 9 A press-fit plate provided by the utility model.

[0029] Reference numerals:

[0030] 1. Detection assembly; 11. Side cover; 12. Observation window; 2. Sampling assembly; 21. Sampling part; 22. Sampling rod; 23. Ring groove; 24. Sampling cover; 25. First positioning groove; 26. Second positioning groove; 3. Sample chamber; 31. Connecting block; 32. Partition chamber; 33. Dilution chamber; 34. Partition wall; 35. Sample delivery channel; 36. Support bar; 4. Piston; 41. Flow part; 42. Sealing part; 5. Bottom cover; 51. Top column; 52, cache cavity; 6, detection component; 61, detection main board; 62, reagent strip; 621, conductive part; 622, color display part; 623, indication part; 624, substrate; 63, trigger electrode; 64, buzzer; 65, display screen; 66, detection element; 67, MCU; 68, wireless communication module; 69, power supply element; 7, press-fit plate; 71, electrode fixing groove; 72, fixing buckle; 73, detection hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Embodiment 1

[0033] like Figure 1-Figure 9 As shown, the present embodiment discloses an electronic rapid detection device, including a detection component 1, a sampling component 2 and a sample chamber 3, the detection component 1 is connected to the sample chamber 3, the sampling component 2 is arranged in the sample chamber 3, the sampling component 2 is plugged into the sample chamber 3, and is used for feces sampling, the detection component 1 includes a detection component 6 and a reagent strip 62, a part of the reagent strip 62 is in the sample chamber 3, and the other part extends into the detection component 1, and a color reaction occurs when the reagent strip 62 contacts the sample to be detected, the detection component 6 is arranged in the detection component 1, the detection component 6 includes a detection main board 61 and a photoelectric detection element 66, the photoelectric detection element 66 is arranged on the detection main board 61, the detection main board 61 is arranged in the detection component 1, the detection element 66 is opposite to the other part of the reagent strip 62, and is used to identify the color that appears after the reagent strip 62 undergoes a color reaction, and transmit the detected color signal to the detection main board 61, after sampling, the sample is processed and identified in a closed space, and the operator directly obtains the detection result, which is easy to use and has high recognition accuracy, and is suitable for general users.

[0034] Preferably, the reagent strip 62 includes a substrate 624 and a conductive portion 621, a color developing portion 622 and an indicating portion 623 which are sequentially arranged on the substrate 624. The conductive portion 621 is immersed in the sample solution, and the conductive portion 621 serves to connect the start signal of the detection main board 61. The color developing portion 622 is provided with a color developer which can contact with the indicator in the sample solution to produce a color developing reaction and cause a color change. The indicating portion 623 is used to judge the degree of immersion of the sample solution, so as to facilitate the judgment of the degree of completion of the reaction.

[0035] More preferably, the detection element 66 is a photoelectric sensor. The photoelectric sensor emits specific light from a transmitter, and the receiver detects the amount of red, green and blue light in the reflected light, and then determines the color of the reagent strip 62 by comparison.

[0036] Furthermore, the detection component 6 also includes a display screen 65, which is arranged on the detection main board 61, and also includes a side cover 11, which is arranged on the side wall of the detection component 1, and an observation window 12 is provided on the side cover 11. The display screen 65 is opposite to the observation window 12, and the display screen 65 is electrically connected to the detection main board 61, and can convert the color signal received on the detection main board 61 into a symbol recognizable by humans, so that the judgment of the detection result is free from manual judgment.

[0037] Furthermore, the detection component 6 also includes a power supply element 69, an MCU67 and a wireless communication module 68. The power supply element 69, the MCU67 and the wireless communication module 68 are all arranged on the detection main board 61. The power supply element 69 is used to provide long-term working power to the detection component 1, and the MCU67 is used to process the recognized color signal and control the peripheral output information. The wireless communication module 68 can transmit the detection results to an external control terminal, which facilitates the sharing of detection information and is suitable for remote and diagnostic use.

[0038] Preferably, the detection component 6 also includes a buzzer 64, which is disposed on the detection main board 61. The buzzer 64 is electrically connected to the detection main board 61 and transmits the detection result to the outside world in a vibration manner, making it more convenient to use.

[0039] Furthermore, it also includes a piston 4 and a bottom cover 5. The piston 4 is slidably connected in the sample chamber 3 and can slide along the axis of the sample chamber 3. The bottom cover 5 is arranged at the ends of the detection component 1 and the sample chamber 3. The sample chamber 3 includes a dilution chamber 33 and a sample delivery channel 35. The dilution chamber 33 is arranged in the sample chamber 3. A solution for diluting the sample is arranged in the dilution chamber 33, which plays a role in homogenizing the sample and improving the fluidity of the sample. The sample delivery channel 35 is arranged on the inner wall of the sample chamber 3. One end of the sample delivery channel 35 is connected to the dilution chamber 33, and the other end extends into the bottom cover 5. The piston 4 slides up and down to control the connection state of the sample delivery channel 35. A pit is arranged on the end surface of the piston 4. The sampling part 21 contacts the pit to push the piston 4 downward, so that the sample delivery channel 35 is connected with the dilution chamber 33. The diluted sample flows out through the sample delivery channel 35 and contacts with the reagent strip 62, and a color reaction begins. The flow of the sample is controlled by the piston 4, so that the sample can be fully diluted in the dilution chamber 33 to ensure the accuracy of the detection.

[0040] Preferably, the piston 4 includes a circulation portion 41 and a sealing portion 42 , both of which are arranged on the outer wall of the piston 4 . The circulation portion 41 can accelerate the downward flow of the sample solution, and a sealing ring is arranged in the sealing portion 42 to improve the sealing performance of the dilution chamber 33 .

[0041] Preferably, the bottom cover 5 includes a top column 51 and a cache cavity 52. ​​The cache cavity 52 is arranged in the bottom cover 5, and the top column 51 is arranged in the cache cavity 52. ​​The top column 51 can contact the piston 4. The top column 51 serves as the lower limit of the movement of the piston 4. The cache cavity 52 is used to store a certain amount of sample solution to ensure that the reagent strip 62 can contact enough samples. A maze wall is provided in the cache cavity 52 to reduce the fluidity of the sample solution.

[0042] More preferably, the sample chamber 3 also includes a partition chamber 32 and a partition wall 34. The partition wall 34 is arranged in the sample chamber 3 to divide the sample chamber 3 into a communicable partition chamber 32 and a dilution chamber 33. The partition chamber 32 can improve the sealing of the sample chamber 3. A through hole is provided in the partition wall 34. The through hole is gap-matched with the sampling rod 22 of the sampling assembly 2 and is tightly fitted with the annular groove 23 equipped with a sealing ring, so that the dilution chamber 33 can be completely closed to prevent the sample solution from leaking out. The through hole can also scrape off excess sample volume on the sampling part 21, so that the sample volume entering the dilution chamber 33 is accurate.

[0043] Furthermore, it also includes a connecting block 31 arranged between the detection component 1 and the sample chamber 3, and the two ends of the connecting block 31 are respectively connected to the detection component 1 and the sample chamber 3. The sampling component 2 includes a sampling part 21, a sampling cover 24, a sampling rod 22, a first positioning groove 25 and a second positioning groove 26. One end of the sampling rod 22 is connected to the sampling part 21, and the other end is connected to the sampling cover 24. The first positioning groove 25 and the second positioning groove 26 are sequentially arranged on the sampling cover 24 along the axial direction of the sampling rod 22, and the first positioning groove 25 and the second positioning groove 26 are connected. The first positioning groove 25 and the second positioning groove 26 are staggered along the axial direction of the sampling component 2. The connecting block 31 cooperates with the first positioning groove 25 and the second positioning groove 26 to limit the depth of the sampling part 21 entering the sample chamber 3. The connecting block 31 is slid by rotating the sampling component 2. After the connecting block 31 moves from the first positioning groove 25 to the second positioning groove 26, the sampling component 2 can be extended into the sample chamber 3, so that the steps of sample operation are clear and the operation difficulty is reduced.

[0044] Preferably, the sampling portion 21 is provided with a plurality of grooves along the axis of the sampling rod 22 for accommodating sufficient samples; an inner cover is provided inside the sampling cover 24, and the inner cover cooperates with the inner wall of the sample chamber 3 to close the opening of the sample chamber 3 to prevent leakage of the sample odor and reduce the difficulty of operation; a plurality of anti-slip grooves are provided on the outer wall of the sampling cover 24 for convenient hand-held use.

[0045] Preferably, a pressing plate 7 is provided between the reagent strip 62 and the detection component 6, and one side of the pressing plate 7 cooperates with the support bar 36 on the outer wall of the sample chamber 3 to fix the reagent strip 62, and a fixing buckle 72 and a detection hole 73 are provided on the pressing plate 7. The fixing buckle 72 is used to fix the detection main board 61 to improve the stability of the detection main board 61, and the detection hole 73 is opposite to the detection element 66 and is used for detection by the detection element 66.

[0046] Embodiment 2

[0047] The present embodiment also discloses an electronic rapid detection device, in which the detection component 6 includes a trigger electrode 63, one end of which is in contact with the reagent strip 62, and the other end is connected to the detection main board 61. There are two trigger electrodes 63, and the two trigger electrodes 63 are spaced apart and respectively in contact with the reagent strip 62. When the reagent strip 62 is infiltrated by the sample, a current path is formed between the two trigger electrodes 63, and the detection element 66 is activated, transmitting the photoelectric signal identified on the reagent strip 62 to the detection main board 61 to complete the signal analysis.

[0048] More preferably, an electrode fixing groove 71 is provided on the pressing plate 7 , and the other end of the trigger electrode 63 is fixed in the electrode fixing groove 71 . After one end of the trigger electrode 63 is extended, it has a certain elasticity and can stably contact with the reagent strip 62 .

[0049] The working process of the electronic rapid detection device is as follows:

[0050] Hold the sampling cover 24 to separate the sampling assembly 2 from the sample chamber 3, extend the sampling part 21 into the sample and rotate it for a few turns, put the sampling assembly 2 into the sample chamber 3 again, and the sampling part 21 passes through the partition wall 34 and enters the dilution chamber 33. Rotate the sampling cover 24 to allow the sample on the sampling part 21 to fully dissolve into the diluent. After the sample is fully dissolved, rotate the sampling cover 24 to align the first positioning groove 25 with the connecting block 31, press the sampling assembly 2 to make the end of the sampling part 21 contact with the piston 4, rotate the sampling cover 24 until the connecting block 31 is aligned with the second positioning groove 26, press the sampling assembly 2 downward to drive the piston 4 to The sample solution enters the buffer cavity 52 of the bottom cover 5 along the sample delivery channel 35. After the sample solution fills the buffer cavity 52, it contacts the reagent strip 62. The sample solution moves along the reagent strip 62. The trigger electrode 63 is turned on. After receiving the signal, the detection main board 61 opens the detection element 66 and starts to enter the working state. The sample solution passes through the color development part 622 and the indication part 623. The detection element 66 performs photoelectric detection and transmits the color recognition to the detection main board 61. The detection main board 61 controls the buzzer 64 to sound and the display screen 65 to output the detection result for people to directly observe the result.

[0051] Embodiment 3

[0052] This embodiment also discloses an in vitro detection method, comprising the following steps:

[0053] S1. Sampling: providing a sampling component 2, a sample chamber 3 and a detection component 1, and collecting samples for in vitro detection by the sampling component 2;

[0054] S2. Sample processing: Hold the sampling component 2 and send the sample into the sample chamber 3, where the sample is dissolved and diluted;

[0055] S3. Sample transfer: The detection component 1 is provided with a reagent strip 62, and a sample delivery channel 35 is provided between the sample chamber 3 and the detection component 1, the sampling component 2 is pushed downward, the sample delivery channel 35 is opened, and the diluted sample contacts the reagent strip 62 through the sample delivery channel 35;

[0056] S4. Sample detection: The detection component 1 performs photoelectric recognition on the reagent strip 62 filled with the sample, and identifies the color change of the reagent strip 62;

[0057] S5. Result output: The detection component 1 outputs the color change signal of the reagent strip 62 in a form readable by humans and / or computers.

[0058] According to the disclosure and teaching of the above description, the technical personnel in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes of the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. An electronic rapid detection device, comprising a detection component (1), a sampling component (2) and a sample chamber (3), wherein the detection component (1) is connected to the sample chamber (3), and the sampling component (2) is arranged in the sample chamber (3), characterized in that: The detection component (1) comprises a detection component (6) and a reagent strip (62), a portion of the reagent strip (62) is located in the sample chamber (3), and another portion extends into the detection component (1), the detection component (6) is arranged in the detection component (1), the detection component (6) comprises a detection main board (61) and a photoelectric detection element (66), the photoelectric detection element (66) is arranged on the detection main board (61), the detection main board (61) is arranged in the detection component (1), and the detection element (66) is opposite to the other portion of the reagent strip (62).

2. The electronic rapid detection device according to claim 1, characterized in that: The detection component (6) further comprises a trigger electrode (63), one end of which is in contact with the reagent strip (62) and the other end of which is connected to the detection main board (61).

3. The electronic rapid detection device according to claim 2, characterized in that: The detection component (6) further comprises a display screen (65), wherein the display screen (65) is arranged on the detection main board (61), and further comprises a side cover (11), wherein the side cover (11) is arranged on a side wall of the detection component (1), and an observation window (12) is provided on the side cover (11), and the display screen (65) is opposite to the observation window (12).

4. The electronic rapid detection device according to claim 1, characterized in that: The detection component (6) further comprises a power supply element (69), an MCU (67) and a wireless communication module (68); the power supply element (69), the MCU (67) and the wireless communication module (68) are all arranged on the detection mainboard (61).

5. The electronic rapid detection device according to claim 4, characterized in that: The detection component (6) further comprises a buzzer (64), and the buzzer (64) is arranged on the detection main board (61).

6. The electronic rapid detection device according to any one of claims 1 to 5, characterized in that: The invention also comprises a piston (4) and a bottom cover (5), wherein the piston (4) is slidably connected in the sample chamber (3), and the bottom cover (5) is arranged at the ends of the detection component (1) and the sample chamber (3). The sample chamber (3) comprises a dilution chamber (33) and a sample delivery channel (35), wherein the dilution chamber (33) is arranged in the sample chamber (3), and the sample delivery channel (35) is arranged on the inner wall of the sample chamber (3), wherein one end of the sample delivery channel (35) is connected to the dilution chamber (33), and the other end extends into the bottom cover (5), and the piston (4) controls the connection state of the sample delivery channel (35).

7. The electronic rapid detection device according to claim 6, characterized in that: The piston (4) comprises a circulation portion (41) and a sealing portion (42), and the circulation portion (41) and the sealing portion (42) are both arranged on the outer wall of the piston (4).

8. The electronic rapid detection device according to claim 6, characterized in that: The bottom cover (5) comprises a top column (51) and a cache cavity (52); the cache cavity (52) is arranged in the bottom cover (5); the top column (51) is arranged in the cache cavity (52); and the top column (51) can contact the piston (4).

9. The electronic rapid detection device according to claim 6, characterized in that: The sample chamber (3) further comprises a partition chamber (32) and a partition wall (34); the partition wall (34) is arranged in the sample chamber (3) to separate the sample chamber (3) into the partition chamber (32) and the dilution chamber (33) which are communicable with each other.

10. The electronic rapid detection device according to any one of claims 1 to 5, characterized in that: The detection assembly (1) and the sample chamber (3) further comprise a connecting block (31) arranged between the detection assembly (1) and the sample chamber (3); the sampling assembly (2) comprises a sampling portion (21), a sampling cover (24), a sampling rod (22), a first positioning groove (25) and a second positioning groove (26); one end of the sampling rod (22) is connected to the sampling portion (21), and the other end is connected to the sampling cover (24); the first positioning groove (25) and the second positioning groove (26) are arranged on the sampling cover (24) in sequence along the axial direction of the sampling rod (22); the first positioning groove (25) and the second positioning groove (26) are communicated; the connecting block (31) cooperates with the first positioning groove (25) and the second positioning groove (26) respectively to limit the depth of the sampling portion (21) entering the sample chamber (3).

Images