Olfactory detection apparatus

Abstract

The application relates to the field of medical devices and discloses an olfactory detection device which comprises a host, a breathing mask and a connecting structure arranged between the host and the breathing mask; at least one smell bottle, a blowing pump and a blowing electromagnetic valve are arranged in the host; the blowing pump is used for providing airflow so that the airflow carries test smell in the smell bottle to the breathing mask; the breathing mask is provided with a blowing passage and a backflow passage. In the application, the blowing passage and the backflow passage are arranged at the breathing mask, test gas is transported to the nose area of a subject to perform olfactory detection, meanwhile, the remaining test gas which is not inhaled can be recycled, the test gas escaping to the external environment and remaining in the device are reduced, the cross smell interference between front and rear wheel tests is reduced, and the stability of the olfactory detection process and the reliability of the detection result are improved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to olfactory detection devices. Background Technology

[0002] Olfactory detection devices are mainly used to release test odors into the nasal area of ​​subjects and to evaluate their olfactory function based on their perception, discrimination, identification, or recall of the test odors. These devices are used to conduct olfactory threshold detection, odor recognition detection, and odor recall detection. Existing olfactory detection devices typically include an odor source, an air delivery structure, and an output end for subjects to smell. By delivering the test odor to the vicinity of the subject's nose, the subject completes the corresponding smelling and judgment operations within a specified time.

[0003] A search revealed that CN116616720A discloses an odor delivery and olfactory detection device and its control method. The device includes a main air pump, multiple test odor sources, an air exchange source, and an air path structure connected to the test object, which can realize the delivery of test odors and air exchange and cleaning.

[0004] However, in the process of testing odor release, existing devices usually leave a portion of uninhaled test gas in addition to the portion actually inhaled by the subject. This portion of test gas is prone to escape from the vicinity of the output end and form residues around the device or in the gas path, which interferes with subsequent tests and affects the stability of the detection process and the accuracy of the detection results. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an olfactory detection device that solves the problem that, during the odor release testing process, existing devices typically leave a portion of uninhaled test gas in addition to the portion actually inhaled by the subject. This uninhaled test gas tends to escape from the vicinity of the output end and form residues around the device or in the gas path, interfering with subsequent tests and affecting the stability of the detection process and the accuracy of the test results.

[0006] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0007] An olfactory detection device includes a main unit, a breathing mask, and a connection structure disposed between the main unit and the breathing mask; the main unit contains at least one odor bottle, an air pump, and an air solenoid valve; the air pump is used to provide airflow so that the airflow carries the test odor in the odor bottle to the breathing mask; the breathing mask is provided with an air blowing passage and a return passage, the air blowing passage is used to deliver test gas into the breathing mask, and the return passage is used to recover the remaining gas in the breathing mask that has not been inhaled.

[0008] In one embodiment, the main unit is provided with an air inlet and a return outlet; the air blowing passage includes an air inlet, an air blowing chamber and an air blowing hole, and the return flow passage includes a return hole, a return chamber and a return outlet; the breathing mask is provided with an air blowing chamber and a return chamber, the air blowing chamber is connected to the air blowing hole and the return chamber is connected to the return hole.

[0009] Preferably, the air inlet is located on the upper side of the breathing mask, and the return inlet is located on the lower side of the breathing mask, so that the test gas forms a top-to-bottom flow path inside the breathing mask.

[0010] In one embodiment, the connection structure includes a connector and a control head. One end of the connector is mounted on the host and the other end is provided with a movable slot. The control head is slidably mounted in the movable slot and is connected to the breathing mask.

[0011] In one embodiment, an elastic element is provided between the control head and the movable slot, the elastic element being used to drive the control head to reset toward the initial position.

[0012] In one embodiment, the control head is provided with an air blowing connection pipe and a return flow connection pipe, and the connection seat is provided with an air blowing pipe and a return flow pipe; the air blowing connection pipe is connected to the air blowing pipe, and the return flow connection pipe is correspondingly provided with the return flow pipe; the air blowing connection pipe is connected to the air blowing chamber, and the return flow connection pipe is connected to the return flow chamber.

[0013] Preferably, when the patient brings their nose close to or inserts it into the breathing mask, the breathing mask moves the control head relative to the connector, causing misalignment between the return pipe and the return tube to reduce or close the return path; when the patient leaves the breathing mask, the control head resets under the action of the elastic element, allowing the return pipe to reconnect with the return tube to restore the return path.

[0014] In one embodiment, the main unit is further provided with a placement tray and a multi-port, and the odor bottle is placed in the placement tray; the air outlet of the air pump is connected to the multi-port, and the multiple outputs of the multi-port are selectively connected to multiple odor bottles respectively; the air outlet of each odor bottle is connected to an air blowing solenoid valve, and the air outlet of the air blowing solenoid valve is connected to an air blowing port to deliver the test gas to the breathing mask.

[0015] In a preferred embodiment, the multiple output terminals of the multi-channel are respectively connected to multiple odor bottles via corresponding one-way valves; the main unit is also provided with an air-blowing solenoid valve, the air outlet of the air pump is also connected to the air inlet of the air-blowing solenoid valve, and the air outlet of the air-blowing solenoid valve is connected to the air-blowing solenoid valve; the air-blowing solenoid valve is used to provide airflow to the air-blowing solenoid valve to clean the air-blowing passage.

[0016] In another preferred embodiment, the main unit is further provided with a reflux pump, which is connected to a reflux port and is used to draw in the remaining gas in the breathing mask.

[0017] (III) Beneficial Effects This invention provides an olfactory detection device. Compared with the prior art, it has the following advantages: By setting up an air blowing path and a return path at the breathing mask, the test gas can be delivered to the subject's nasal area for olfactory detection, while the remaining test gas that is not inhaled can be recovered. This reduces the escape of test gas into the external environment and the residue in the device, reduces cross-contamination between the front and rear tests, and improves the stability of the olfactory detection process and the reliability of the test results.

[0018] By setting up a connector, control head, reflux tube, and reflux coupling tube between the main unit and the breathing mask, and by utilizing the movement of the control head when the subject approaches or inserts into the breathing mask, the reflux coupling tube and the reflux tube are misaligned, reducing or closing the reflux path; after the subject leaves, the control head resets under the action of the elastic element, and the reflux path is restored. This not only recovers the escaping gas in the non-detection state, but also avoids the reflux effect from affecting the subject's inhalation of sufficient test gas during actual smelling, thus balancing the recovery of residual gas and the effective inhalation of test gas.

[0019] By incorporating a placement tray, multi-port valve, one-way valve, odor bottle, blowing solenoid valve, air-blowing solenoid valve, and reflux pump, the device enables coordinated delivery of test gases, cleaning of the blowing path, and recovery of residual gas. The multi-port valve and multiple odor bottles facilitate switching between different test odors or odors with different concentration gradients. The one-way valve helps reduce backflow and crossflow between different odor bottles. The air-blowing solenoid valve provides airflow during test intervals to clean the blowing path, improving the ease of use and consistency of continuous testing. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of the host of the present invention.

[0023] Figure 3 This is a schematic diagram of the gas path connection relationship of the present invention.

[0024] Figure 4 This is a perspective view of the breathing mask, connector, and control head of the present invention.

[0025] Figure 5 This is a three-dimensional schematic diagram of the breathing mask, connector, and control head of the present invention from another perspective.

[0026] Figure 6 This is a cross-sectional view of the breathing mask, connector, and control head of the present invention.

[0027] Figure 7 This is a schematic diagram of the return path switching process of the present invention.

[0028] Figure 8 This is a photographic illustration of the actual product of the present invention.

[0029] The attached figures are labeled as follows: 10. Main unit; 101. Air outlet; 102. Return outlet; 103. Odor bottle; 104. Placement tray; 105. Multi-port valve; 106. Air pump; 107. Air blowing solenoid valve; 108. Return pump; 109. Air blowing solenoid valve; 20. Breathing mask; 201. Exhalation chamber; 202. Exhalation port; 203. Return chamber; 204. Return port; 30. Connecting seat; 301. Air blowing pipe; 302. Return pipe; 303. Elastic element; 40. Control head; 401. Air blowing connection pipe; 402. Return flow connection pipe. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides an olfactory detection device suitable for olfactory threshold detection, odor recognition detection, and odor recall detection in subjects. The device can deliver the test odor, clean the blowing passage by blowing air after the test, and recover the escaping gas when the subject is not wearing the breathing mask 20, thereby reducing residual odor and cross-contamination interference, and improving the stability and reliability of the detection results.

[0032] Example 1 Reference Figure 1-8This embodiment provides an olfactory detection device, including a main unit 10, a breathing mask 20, and a connection structure disposed between the main unit 10 and the breathing mask 20.

[0033] The main unit 10 is the main body of the device, used to install and accommodate components such as the odor bottle 103, the placement tray 104, the multi-channel 105, the blowing pump 106, the air blowing solenoid valve 107, the return pump 108, the blowing solenoid valve 109, and the main control system; the breathing mask 20 is used to be set up corresponding to the nose of the subject during the test to form a local olfactory space; the connecting structure is used to connect the main unit 10 and the breathing mask 20 and realize the connection between the blowing passage and the return passage.

[0034] The main unit 10 is provided with an air outlet 101 and a return outlet 102. The air outlet 101 is used to output the test airflow or airflow generated in the main unit 10 to the breathing mask 20, and the return outlet 102 is used to guide the remaining gas in the breathing mask 20 that has not been inhaled by the subject back into the main unit 10 so that it can be sucked back by the return pump 108.

[0035] The breathing mask 20 is provided with an air blowing chamber 201 and a return chamber 203. The air blowing chamber 201 is connected to the air blowing port 202, and the return chamber 203 is connected to the return port 204. The air blowing port 202 is located on the upper side of the breathing mask 20, and the return port 204 is located on the lower side of the breathing mask 20, so that the test gas forms a top-to-bottom flow path within the breathing mask 20.

[0036] Specifically, after the test odor airflow is blown out through the air outlet 202, it preferentially acts on the subject's nasal area. The remaining gas that is not inhaled continues to flow downwards and enters the return chamber 203 through the return outlet 204. This upward blowing and downward returning structure helps to improve the efficiency of the test gas's effect on the subject's nose and also helps to control the direction of odor overflow, reducing the diffusion of the test gas into the surrounding environment.

[0037] In this embodiment, the blowing passage includes a blowing port 101, a blowing chamber 201, and a blowing hole 202, while the return passage includes a return hole 204, a return chamber 203, and a return port 102. The breathing mask 20 can adopt a near-nose mask structure suitable for close contact or partial insertion with the nose. Its inner surface can be an arc surface, a concave surface, or a surrounding surface that conforms to the shape of the nose to improve stability and comfort during testing. The number, diameter, and distribution of the blowing holes 202 and the return holes 204 are not limited, as long as they can form a directional flow from the blowing side to the return side.

[0038] To facilitate the subject to form a relatively stable testing posture, the breathing mask 20 is preferably positioned close to the subject's nose and can protrude appropriately to one side relative to the connecting seat 30. When the subject follows the operation instructions to bring their nose close to or insert it into the breathing mask 20, it is easier to form a stable contact with the breathing mask 20, providing a basis for the subsequent trigger displacement of the control head 40.

[0039] Example 2 Reference Figure 3-6 A connecting seat 30 and a control head 40 are provided between the main unit 10 and the breathing mask 20. One end of the connecting seat 30 is installed on the main unit 10, and the other end is provided with a movable groove. The control head 40 is slidably installed in the movable groove and is connected to the breathing mask 20. An elastic element 303 is provided between the control head 40 and the movable groove. The elastic element 303 is used to drive the control head 40 to return to the initial position. The elastic element 303 can be a compression spring or a spring block.

[0040] The connecting seat 30 is provided with an air blowing pipe 301 and a return pipe 302. The control head 40 is provided with an air blowing connecting pipe 401 and a return pipe 402. The air blowing connecting pipe 401 is connected to the air blowing pipe 301 and is further connected to the air blowing chamber 201. The return pipe 402 is correspondingly provided to the return pipe 302 and is further connected to the return chamber 203.

[0041] In this embodiment, the air blowing connection pipe 401 and the air blowing pipe 301 are kept in communication so that the air blowing passage is always in a conductive state during the detection process. The return flow connection pipe 402 and the return flow pipe 302 are configured to have a connection state that can be changed with the relative displacement of the control head 40.

[0042] Specifically, in the initial state, the return pipe 402 and the return pipe 302 are aligned and connected, and the return path remains open. When the subject brings his nose close to or inserts it into the breathing mask 20, the breathing mask 20 moves the control head 40 relative to the connecting seat 30, causing misalignment between the return pipe 402 and the return pipe 302, thus reducing or closing the return path. When the subject leaves the breathing mask 20, the control head 40 resets under the action of the elastic element 303, and the return pipe 402 reconnects with the return pipe 302 to restore the return path.

[0043] With the above structure, the return flow path can be automatically switched under different detection states. When the subject is not wearing the breathing mask 20, the return flow path remains open to facilitate the return pump 108 to recover the escaped gas. When the subject is actually smelling, the return flow path is reduced or closed to prevent the return pump 108 from drawing away the test gas that should have been inhaled by the subject. After the subject leaves the breathing mask 20, the return flow path is restored to remove residual gas in a timely manner.

[0044] In this embodiment, the switching of the return path does not rely on the subject performing an additional special pressing action. Instead, through the structural shape and installation position of the breathing mask 20 and the low-displacement trigger design of the control head 40, the triggering condition is naturally formed by the subject in a normal detection posture. The breathing mask 20 is set as a near-nose structure for the subject's nose to rest against or partially extend into. In order to form a stable olfactory position and reduce external air interference, the subject usually rests his nose against the breathing mask 20, thereby applying a natural contact force to the breathing mask 20 towards the host 10. The control head 40 is in the movable slot The sliding resistance inside is less than the nasal contact force of the breathing mask 20 in the normal contact state, and the restoring force of the elastic element 303 is less than the triggering force required to move the control head 40 to the predetermined position, so that the above-mentioned natural contact force can drive the control head 40 to move. When the control head 40 moves to the predetermined position, the return pipe 402 and the return pipe 302 are misaligned, which reduces or closes the return path. In order to further improve the triggering stability, the main control system can also guide the subject to place their nose against the predetermined detection position of the breathing mask 20 through display animation, text or voice prompts.

[0045] In other words, the present invention does not require each subject to consciously apply additional pressure to the breathing mask 20. Instead, through structural layout and operational guidance, the subject naturally generates a contact force sufficient to drive the displacement of the control head 40 under normal testing actions. This avoids overly complicated usage and also makes the triggering of the control head 40 highly stable and repeatable.

[0046] Furthermore, in this embodiment, the switching of the return path is triggered by the control head 40 displacing relative to the connector 30 in a way that is sufficient to change the connection state between the return connector 402 and the return pipe 302. If the subject only brings his nose close to the breathing mask 20 without causing the control head 40 to displace in a way that is sufficient to change the connection state, the return path remains open or is only partially reduced. After the subject leaves the breathing mask 20, the control head 40 is reset under the action of the elastic element 303, so that the return connector 402 is reconnected to the return pipe 302 to restore the return path.

[0047] The misalignment referred to here can be either a change from an aligned state to a partially misaligned state or a change from an aligned state to a completely misaligned state. The description of reducing or closing the return flow path in this invention includes situations where the flow cross-sectional area decreases, the flow resistance increases, and the return flow decreases, as well as situations where the return flow path is completely cut off.

[0048] Example 3 Reference Figure 1-7The main unit 10 is equipped with a placement tray 104 and a multi-port 105. Multiple odor bottles 103 are placed in the placement tray 104. The placement tray 104 can be used to centrally install and replace multiple odor bottles 103. The air outlet of the air pump 106 is connected to the multi-port 105. Multiple outputs of the multi-port 105 are connected to multiple odor bottles 103 through corresponding one-way valves. The air outlet of each odor bottle 103 is connected to the air blowing solenoid valve 109. The air outlet of the air blowing solenoid valve 109 is connected to the air blowing port 101 to deliver the test gas to the breathing mask 20.

[0049] The multi-port 105 can be a gas distribution component with multiple branch outputs, or a multi-way switching component with multiple selection channels. Furthermore, the multi-port 105 can be an electrically controlled multi-way valve, a rotary selector valve, or other switching components that can selectively connect one input to multiple outputs. A one-way valve is provided between the multi-port 105 and each odor bottle 103, mainly to prevent backflow, crossflow, and cross-contamination between different odor bottles 103. When one odor bottle 103 is in working condition, the one-way valve can prevent the test gas flow from entering other non-working odor bottle 103 branches in reverse, so as to maintain the independence between different odor sources.

[0050] The main unit 10 is also equipped with an air blowing solenoid valve 107. The air outlet of the air blowing pump 106 is connected to the air inlet of the air blowing solenoid valve 107. The air outlet of the air blowing solenoid valve 107 is connected to the air blowing solenoid valve 109. After the target odor is released, the air blowing solenoid valve 107 can provide air blowing air to the air blowing solenoid valve 109 to clean the blowing passage.

[0051] The main unit 10 is also equipped with a reflux pump 108, which is connected to the reflux port 102 and is used to draw out the remaining gas in the breathing mask 20. The reflux pump 108, reflux port 102, reflux tube 302, reflux connecting tube 402, reflux chamber 203 and reflux hole 204 form a reflux path in sequence. The remaining gas that is not inhaled by the subject can enter the reflux chamber 203 through the reflux hole 204 and is finally drawn back by the reflux pump 108.

[0052] In this embodiment, the main control system is located inside the host 10. The main control system can be any control unit capable of logic control, such as a microcontroller, PLC, embedded control board, industrial control board, or host computer with drive module. The main control system is electrically connected to the air pump 106, air blowing solenoid valve 107, reflux pump 108, air blowing solenoid valve 109, and multi-port 105, and is used to control the delivery of test gas, air blowing cleaning, reflux recovery, and switching between different odor bottles 103.

[0053] The host 10 can also be connected to external devices via a communication interface. Preferably, the host 10 is equipped with an RJ45 interface, which allows it to communicate with a general-purpose computer. The general-purpose computer can send control commands, test parameters, or operating mode settings to the host 10. The host 10 controls the odor tubing according to the received commands to achieve target odor selection, odor release, air blowing cleaning, backflow control, and test process switching. The general-purpose computer can also be used to display the test interface, record patient information, store test data, generate test reports, and query historical records.

[0054] The main control system can also be connected to a display screen, speaker, input module and storage module to display the login interface, patient information, test interface, countdown, image options and result report, and output voice prompts and warning sounds. The device is equipped with a 12-inch touch screen on the front and back, and staff and subjects can operate it at the same time. The system includes functions such as login, patient information collection, formal testing, querying past records and test result dashboard.

[0055] Before the test begins, the main control system controls the air pump 106 to work and controls the air blowing solenoid valve 107 to open, so that clean airflow enters the breathing mask 20 through the air blowing port 101. At the same time, the return pump 108 works to pre-clean the pipeline and breathing mask 20 to remove residual gas from the previous test. This pre-cleaning stage can last for 15-30 minutes.

[0056] When a certain test odor needs to be released, the main control system controls the multi-channel 105 to select the target branch, so that the airflow output by the air pump 106 enters the corresponding odor bottle 103; controls the air blowing solenoid valve 109 to open, so that the test airflow carrying the target odor enters the air blowing chamber 201 through the air blowing port 101, the air blowing pipe 301, and the air blowing connecting pipe 401, and is finally blown out through the air blowing hole 202.

[0057] After a test odor release is completed, the main control system shuts down the target odor branch and controls the air-blowing solenoid valve 107 to open, allowing clean airflow to enter the air-blowing passage through the air-blowing solenoid valve 109, and to blow clean the air-blowing port 101, air-blowing pipe 301, air-blowing connecting pipe 401, air-blowing chamber 201 and air-blowing hole 202. An air-blowing phase of about 5 seconds can be set after each odor release.

[0058] The main control system can control the start / stop or working intensity of the reflux pump 108 according to different stages. When no subject is wearing the mask, the reflux pump 108 continues to work to recover the escaped gas. When the subject is wearing the breathing mask 20 and the reflux path is reduced or closed, the reflux pump 108 can be stopped or its working intensity reduced. After the test, the reflux pump 108 can be restarted to assist in the removal of residual gas.

[0059] To ensure that different subjects can stably trigger the displacement of the control head 40 under normal testing actions, the main control system can guide the subject to place their nose against the predetermined position of the breathing mask 20 and maintain the predetermined testing posture before the test begins through animation, pictures or voice prompts. The edge of the breathing mask 20 can also be set with a flexible contact edge, guide edge or limiting contour to help the subject form a stable contact position, which can further improve the consistency of use among different patients and reduce the problem of trigger instability caused by posture differences.

[0060] Example 4 Reference Figure 1-8 Before use, connect the electric air pump through the external adapter and start the device. The main control system controls the air pump 106, the air blowing solenoid valve 107 and the return pump 108 to pre-emptively ventilate the air blowing passage and breathing mask 20 to remove residual gas from the previous test. The pre-emptive venting time can be 15-30 minutes. The external connection pipe is used by a single person.

[0061] Before the test begins, staff or test subjects log into the system on a display screen. The main control system retrieves or creates patient files, displaying a page for collecting information such as name, gender, education, ID number, date of birth, underlying diseases, olfactory-related diseases, and smoking history. After completing the information, the user proceeds to the next page.

[0062] In the olfactory threshold test mode, multiple odor bottles 103 can correspond to 14 different concentration gradients of n-butanol solution, with the concentration halved at each level. Gradient 1 has the highest concentration, and gradient 14 has the lowest concentration. The main control system controls the multi-port 105 and the blowing solenoid valve 109 to selectively release the n-butanol odor of the target gradient starting from concentration gradient 8, while using air as a reference odor.

[0063] In each round of testing, the subject smells the odor twice and judges which odor is stronger. The interval between the two odors can be 5 seconds, and the duration of each odor can be 5 seconds. When the subject judges correctly twice in a row, the main control system switches to a weaker gradient. When the subject judges incorrectly, the main control system switches to a stronger gradient. After the preset number of reversals is reached, the program stops, and the average of the gradients corresponding to the last two reversals is calculated as the final threshold score.

[0064] During the test, the main control system controls the display screen to play rule explanation animations, display a countdown, and output voice prompts such as "first smell", "second smell", and "please tell me which smell is stronger". Preparation prompts can be given before the smell is released.

[0065] In the scent recognition and recall test mode, different scent bottles 103 can each contain different types of essential oils. The first round can select 10 scents, and the second round can select 20 scents. The first round of recognition test can include scents such as peppermint, dried clove, leather, strawberry, clove flower, pineapple, smoke, soap, grape and lemon. The second round can also add scents such as banana, garlic, cherry, baby powder, grass, mixed fruit, peach, chocolate, earth and orange.

[0066] During the test, the main control system controls the branch of the target odor bottle 103 to conduct, so that the corresponding odor is released to the vicinity of the subject's nose through the air outlet 101 and the breathing mask 20. The subject smells the odor under the guidance of voice or visual prompts and selects the item that is closest to the smell from four pictures on the display screen. After each odor is released, the main control system controls the air blowing solenoid valve 107 to clean the air blowing passage. If the subject cannot judge the odor the first time, he / she can select "smell again" through the interface, and the main control system will control the release of the odor again. After the first round, the system can wait for a predetermined time before entering the second round, or it can be entered directly through manual operation. In the second round, the subject is required to complete the odor identification and the judgment of whether it is an old odor.

[0067] After the test, the main control system generates a test report, which may include the patient's name, ID number, age, education level, test time, test results, and correction values. The threshold test section can display the inflection point and final score, while the recognition and recall test sections can display the recognition score and correction values.

[0068] In summary, compared with the prior art, the olfactory detection device proposed in this application has the following advantages: By setting up an air blowing path and a return path at the breathing mask 20, the test gas can be delivered to the subject's nasal area for olfactory detection, while the remaining test gas that has not been inhaled can be recovered. This reduces the escape of test gas into the external environment and the residue in the device, reduces cross-contamination between the front and rear tests, and improves the stability of the olfactory detection process and the reliability of the test results.

[0069] By setting a connecting seat 30, a control head 40, a return tube 302, and a return coupling tube 402 between the main unit 10 and the breathing mask 20, and by using the subject to move the control head 40 when it approaches or inserts into the breathing mask 20, the return coupling tube 402 and the return tube 302 are misaligned, reducing or closing the return path; after the subject leaves, the control head 40 is reset under the action of the elastic element 303, and the return path is restored. This can both recover the escaping gas in the non-detection state and avoid the backflow effect from affecting the subject's inhalation of sufficient test gas during actual smelling, thus taking into account both the recovery of residual gas and the effective inhalation of test gas.

[0070] By setting up a placement tray 104, a multi-port 105, a one-way valve, an odor bottle 103, a blowing solenoid valve 109, an air-blowing solenoid valve 107, and a return pump 108, the selective delivery of test gas, the cleaning of the blowing path, and the recovery of residual gas can be achieved in a coordinated manner. The multi-port 105 and multiple odor bottles 103 facilitate the switching between different test odors or odors with different concentration gradients; the one-way valve helps to reduce backflow and crossflow between different odor bottles 103; the air-blowing solenoid valve 107 can provide airflow during test intervals to clean the blowing path, improving the ease of use and consistency of testing during continuous testing.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0072] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An olfactory detection device, characterized in that, It includes a main unit (10), a breathing mask (20), and a connection structure disposed between the main unit (10) and the breathing mask (20); The main unit (10) is equipped with at least one odor bottle (103), an air pump (106) and an air solenoid valve (109). The air pump (106) is used to provide airflow so that the airflow carries the test odor in the odor bottle (103) to the breathing mask (20). The breathing mask (20) is provided with an air blowing passage and a return passage. The air blowing passage is used to deliver test gas into the breathing mask (20), and the return passage is used to recover the remaining gas in the breathing mask (20) that has not been inhaled.

2. The olfactory detection device according to claim 1, characterized in that, The host (10) is provided with an air blowing port (101) and a return port (102). The blowing passage includes a blowing port (101), a blowing chamber (201), and a blowing hole (202), and the return passage includes a return hole (204), a return chamber (203), and a return port (102). The breathing mask (20) is provided with an air blowing chamber (201) and a return chamber (203). The air blowing chamber (201) is connected to the air blowing hole (202), and the return chamber (203) is connected to the return hole (204).

3. The olfactory detection device according to claim 2, characterized in that, The blowing hole (202) is located on the upper side of the breathing mask (20), and the return hole (204) is located on the lower side of the breathing mask (20), so that the test gas forms a downward flow path in the breathing mask (20).

4. The olfactory detection device according to claim 1, characterized in that, The connection structure includes a connector (30) and a control head (40). One end of the connector (30) is mounted on the host (10), and the other end is provided with a movable groove. The control head (40) is slidably mounted in the movable groove and is connected to the breathing mask (20).

5. The olfactory detection device according to claim 4, characterized in that, An elastic element (303) is provided between the control head (40) and the movable groove. The elastic element (303) is used to drive the control head (40) to reset towards the initial position.

6. The olfactory detection device according to claim 4, characterized in that, The control head (40) is provided with an air blowing connection pipe (401) and a return flow connection pipe (402), and the connection seat (30) is provided with an air blowing pipe (301) and a return flow pipe (302). The air blowing connection pipe (401) is connected to the air blowing pipe (301), and the return flow connecting pipe (402) is correspondingly provided with the return flow pipe (302); The air blowing connection pipe (401) is connected to the air blowing chamber (201), and the return flow connection pipe (402) is connected to the return flow chamber (203).

7. The olfactory detection device according to claim 6, characterized in that, When the patient brings their nose close to or inserts it into the breathing mask (20), the breathing mask (20) moves the control head (40) relative to the connecting seat (30), causing misalignment between the return pipe (402) and the return pipe (302) to reduce or close the return path; When the patient leaves the breathing mask (20), the control head (40) is reset under the action of the elastic element (303), so that the return pipe (402) is reconnected to the return pipe (302) to restore the return path.

8. The olfactory detection device according to claim 1, characterized in that, The host (10) is also provided with a placement tray (104) and a multi-channel (105), and the scent bottle (103) is placed in the placement tray (104); The air outlet of the air pump (106) is connected to the multi-port (105), and the multiple outputs of the multi-port (105) are selectively connected to multiple odor bottles (103). The outlet of each odor bottle (103) is connected to the blowing solenoid valve (109), and the outlet of the blowing solenoid valve (109) is connected to the blowing port (101) to deliver the test gas to the breathing mask (20).

9. The olfactory detection device according to claim 8, characterized in that, The multiple outputs of the multi-port (105) are connected to multiple odor bottles (103) via corresponding one-way valves; The host (10) is also equipped with an air blowing solenoid valve (107), the air outlet of the air pump (106) is connected to the air inlet of the air blowing solenoid valve (107), and the air outlet of the air blowing solenoid valve (107) is connected to the air blowing solenoid valve (109). The air-blowing solenoid valve (107) is used to provide air-blowing airflow to the air-blowing solenoid valve (109) to clean the air-blowing passage.

10. The olfactory detection device according to claim 1, characterized in that, The host (10) is also equipped with a reflux pump (108), which is connected to the reflux port (102) and is used to draw out the remaining gas in the breathing mask (20).

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