An arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal

Abstract

The application discloses an arm-circumference-adaptive portable autologous arteriovenous internal fistula auscultation terminal and belongs to the technical field of medical devices. The arm-circumference-adaptive portable autologous arteriovenous internal fistula auscultation terminal comprises a terminal shell, a handle fixedly connected to one side of the terminal shell, and a connecting rod rotatably connected to the bottom end of the handle. A locking mechanism is installed at the bottom end of the connecting rod, a lifting mechanism is installed in the terminal shell, and an auscultation mechanism is installed at the bottom end of the lifting mechanism. The locking mechanism can be operated by a single medical staff, so that the whole device can be worn on the arm, and subsequent medical staff can conveniently perform internal fistula auscultation through the auscultation mechanism. The operation does not require multiple people and is simple. Meanwhile, the device can be used for different patients, can quickly adhere the auscultation mechanism to the arm, forms an independent and closed gas storage cavity, thereby guaranteeing the sealing performance and signal collection accuracy of the auscultation sound pickup link, and greatly improves the crowd adaptation range of the device.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a portable autologous arteriovenous fistula auscultation terminal with arm circumference adaptive. Background Technology

[0002] The arm-circumference adaptive portable autogenous arteriovenous fistula (AVF) auscultation terminal is a smart medical device designed for hemodialysis patients for daily monitoring of AVFs in home or clinical settings. Its core feature is its "arm-circumference adaptive" structure, which, through an adjustable or flexible fit mechanism, stably adapts to the upper arms of patients of different circumferences, ensuring a constant and comfortable contact pressure between the sensor and the skin of the fistula area. The terminal integrates a high-sensitivity acoustic sensor and signal processing module, clearly acquiring the blood flow sounds (flutter, murmur) and pulsation characteristics of the fistula, and supports Bluetooth or wireless transmission to mobile phones or healthcare platforms. The device can assist in identifying abnormal hemodynamic changes such as fistula stenosis and thrombosis, enabling early warning. Compared to traditional stethoscopes, its advantages lie in its ease of operation, portability, wearability, and objective data recording, helping to improve patient self-management capabilities and the quality of remote follow-up.

[0003] When auscultating a patient's arm fistula, the stethoscope is usually placed at the fistula site to determine vascular abnormalities by listening to the sounds. However, the traditional stethoscope is cumbersome to adjust and not convenient for single-person operation. At the same time, there are significant individual differences in the size of patients' arms in clinical practice, and the stethoscope is not very precise in fitting the arm, resulting in insufficient auscultation signal acquisition accuracy and inaccurate information, which has become a pain point of limited clinical adaptability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal.

[0005] The technical solution adopted to solve the above technical problems is: a portable autogenous arteriovenous fistula auscultation terminal with arm circumference adaptive, including a terminal shell, a handle fixedly connected to one side of the terminal shell, and a connecting rod rotatably connected to one side of the bottom end of the handle;

[0006] A locking mechanism is installed at the bottom of the connecting rod, and a lifting mechanism is installed inside the terminal housing. A stethoscope mechanism is installed at the bottom of the lifting mechanism.

[0007] Furthermore, two limiting grooves are provided at the bottom of the terminal housing.

[0008] The above technical solution facilitates the lifting and lowering activities of the lifting mechanism.

[0009] Furthermore, the locking mechanism includes a mounting shell with a ball head connected to the bottom end of the connecting rod. A first locking ring is fixedly connected inside the mounting shell, and a second locking ring is rotatably connected to the first locking ring. The second locking ring has multiple toothed grooves. A locking rod is rotatably connected to the inner wall of the mounting shell above the first locking ring. A limit strip is slidably connected to the inner wall of the mounting shell above the locking rod. A U-shaped elastic strip is fixedly connected to the inner wall of the mounting shell between the locking rod and the limit strip. A rotating shaft is rotatably connected to the front end of the inner side of the mounting shell.

[0010] With the above technical solution, when the entire device is placed on the patient's arm, the second locking ring is in the open state compared to the first locking ring. It is first passed through the arm so that the auscultation mechanism can be aligned with the fistula on the arm. The second locking ring is then pushed forcefully, causing multiple grooves on the second locking ring to quickly engage with the ratchet, thus closing the second locking ring and the first locking ring. This allows the entire device to be placed on the arm, facilitating subsequent auscultation of the fistula by medical staff through the auscultation mechanism. The entire process can be completed by a single medical staff member, without the need for multiple people to operate, and it is convenient for single-person operation.

[0011] Furthermore, a sliding groove is provided on one side of the mounting shell, multiple ratchet teeth are provided at the bottom end of the locking rod, and a protrusion is fixedly connected to the top end of the locking rod. In the combined state, the multiple ratchet teeth mesh with the corresponding tooth grooves.

[0012] Through the above technical solution, when the second locking ring and the first locking ring are in the closed state, the second locking ring and the first locking ring have a self-locking function due to the meshing of multiple ratchet teeth with the corresponding tooth grooves. This allows the locking mechanism to be stably fitted on the arm, enabling a single medical staff member to quickly raise and lower the mechanism and accurately align the auscultation device with the fistula for auscultation.

[0013] Furthermore, the bottom end of the limiting strip is provided with a groove and two slots, and a limiting block is fixedly connected to one side of the limiting strip.

[0014] With the above technical solution, when the second locking ring is closed with the first locking ring, the protrusion and the groove are aligned. By forcefully pushing the limiting block, the limiting strip is driven to move, so that the protrusion and the groove are misaligned, preventing the locking rod from swinging up and down, and further improving the closing stability of the second locking ring and the first locking ring.

[0015] Furthermore, a locking block is fixedly connected to the top of the U-shaped elastic bar. In the combined state, the locking block fits into the corresponding slot. A push plate is fixedly connected to the center of the outer wall of the rotating shaft. A torsion spring is fixedly installed at one end of the outer wall of the rotating shaft. A first rotating head is fixedly connected to the other end of the rotating shaft. The torsion spring is fixedly connected to the inner wall of the mounting shell.

[0016] Through the above technical solution, when multiple ratchet teeth engage with their corresponding tooth grooves, the second locking ring pushes the locking rod to swing, causing the locking rod to push the U-shaped spring. The U-shaped spring has an elastic effect, allowing the locking rod to return to its original swing position. This allows multiple ratchet teeth to engage within designated tooth grooves, resulting in different closing diameters for the second and first locking rings. This caters to different arm dimensions and can be applied to various patients. When the limiting strip moves to the designated position, the locking block engages with the corresponding groove, preventing the limiting strip from slipping. This improves the stability when the second and first locking rings are closed. To open the second locking ring and the first locking ring, first reverse the first rotating head, which will drive the rotating shaft to rotate, thereby driving the push plate to rotate. This will cause the push plate to push the limiting strip, aligning the protrusion with the groove. Then, rotate the first rotating head clockwise, which will drive the push plate to push the locking rod, causing the locking rod to swing upward. This will separate the multiple ratchet teeth from the tooth groove, allowing the second locking ring to be opened. The entire device can then be removed from the patient's arm. The rotating shaft can be reset by a torsion spring after rotation. The operation is simple, and the locking mechanism can be stably fitted onto the patient's arm, making it convenient for medical staff to clearly auscultate the arteriovenous fistula through the auscultation device.

[0017] Furthermore, the lifting mechanism includes a mounting plate fixedly connected to the inner wall of the terminal housing. A ring seat is rotatably connected to the bottom center of the mounting plate. A worm gear is fixedly connected to the bottom end of the ring seat. A threaded rod is fixedly connected to the inner wall of the worm gear. A cavity is opened in the center of the threaded rod. Two mounting seats are fixedly connected to one side of the bottom of the mounting plate. A worm is rotatably connected between the two mounting seats. A second rotating head is fixedly connected to one end of the worm. A threaded sleeve is threadedly connected to the outer wall of the threaded rod. Two limiting rods are fixedly connected to the outer wall of the threaded sleeve.

[0018] With the above technical solution, when the entire device is placed on the patient's arm, one hand holds the handle, and the index finger turns the second rotating head, which drives the worm gear to rotate, which in turn drives the worm wheel to rotate, which in turn drives the threaded rod to rotate, which in turn drives the threaded sleeve to descend inside the terminal shell, thereby causing the stethoscope mechanism to descend and fit against the patient's arm, facilitating subsequent auscultation.

[0019] Furthermore, the worm gear meshes with the worm wheel, and the two limiting rods are slidably connected to their respective limiting grooves.

[0020] Through the above technical solution, under the action of the limiting rod and the limiting groove, when the threaded rod drives the threaded sleeve to rotate, it can drive the sleeve to move up and down.

[0021] Furthermore, the auscultation device includes a pickup cover fixedly connected to the bottom end of the threaded sleeve, a flexible sealing skirt fixedly connected to the bottom end of the pickup cover, a circuit board fixedly connected to the top end of the mounting plate, a signal processor mounted on the top of the circuit board, a sound guiding channel installed in the cavity, and a sound sensor fixedly installed inside the pickup cover.

[0022] Using the above technical solution, the microphone cover quickly fits into the location of the fistula in the patient's arm under the action of the lifting mechanism. Since a Bluetooth chip is installed on the circuit board, medical staff only need to turn on their mobile phones and connect to the device via Bluetooth. At this time, the sound of blood flow at the fistula in the arm is transmitted to the sound sensor, and then the information is transmitted to the signal processor through the sound channel. The signal processor processes the information, and medical staff can receive it through their mobile phones to determine whether there is any abnormality in the fistula. The operation is simple.

[0023] Furthermore, the flexible sealing skirt is made of medical-grade silicone, the top end of the sound guide channel is fixedly connected to the signal processor, and the bottom end of the sound guide channel is fixedly connected to the sound sensor.

[0024] Through the above technical solution, the flexible sealing skirt can undergo elastic deformation under slight pressure, automatically conforming to the curved surface of the arm of different diameters to form an independent and closed air storage cavity, thereby ensuring the sealing performance and signal acquisition accuracy of the auscultation pickup process and greatly improving the population compatibility of the device.

[0025] The beneficial effects of the present invention are as follows: (1) The present invention designs a locking mechanism that can be operated by a single medical staff member, thereby putting the entire device on the arm, which makes it convenient for subsequent medical staff to auscultate the fistula through the auscultation mechanism. No multiple people are required to operate it, and the operation is simple. It can also be used for different patients. (2) The present invention designs a lifting mechanism and an auscultation mechanism. The lifting mechanism can quickly adjust the position of the auscultation mechanism, which can quickly fit the auscultation mechanism with the arm to form an independent and closed air storage cavity, thereby ensuring the sealing of the auscultation pickup link and the accuracy of signal acquisition, greatly improving the population compatibility range of the device. At the same time, the auscultation mechanism is equipped with Bluetooth. Medical staff only need to connect and receive the signal through their mobile phones to determine whether there is any abnormality in the fistula. The operation is simple and convenient. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the installation of the present invention on the arm structure;

[0027] Figure 2 This is a first-view view of the present invention;

[0028] Figure 3 This is a second-view view of the present invention;

[0029] Figure 4 This is the front view of the present invention;

[0030] Figure 5 This is a schematic diagram of the terminal housing structure of the present invention;

[0031] Figure 6 This is a side view of the locking mechanism of the present invention;

[0032] Figure 7 This is an exploded view of the locking mechanism of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of some parts of the locking mechanism of the present invention;

[0034] Figure 9 This is a schematic diagram of the lifting mechanism structure of the present invention;

[0035] Figure 10 This is an exploded view of the lifting mechanism and the stethoscope mechanism of the present invention.

[0036] Reference numerals: 1. Terminal housing; 11. Handle; 12. Connecting rod; 13. Limiting groove; 2. Locking mechanism; 201. Mounting shell; 2011. Slide groove; 202. First locking ring; 203. Second locking ring; 204. Tooth groove; 205. Locking rod; 2051. Ratchet; 2052. Protrusion; 206. Limiting strip; 2061. Groove; 2062. Limiting block; 2063. Slot; 207. U-shaped spring bar; 2071. Locking block; 208. Rotating shaft; 2081. Push plate; 2 082. Torsion spring; 2083. First rotating head; 3. Lifting mechanism; 301. Mounting plate; 302. Ring seat; 303. Worm gear; 304. Threaded rod; 305. Cavity; 306. Mounting seat; 307. Worm; 308. Second rotating head; 309. Threaded sleeve; 310. Limiting rod; 4. Stethoscope mechanism; 401. Sound pickup cover; 402. Flexible sealing skirt; 403. Circuit board; 404. Signal processor; 405. Sound guide channel; 406. Sound sensor; 5. Arm. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1-5 As shown, a portable autologous arteriovenous fistula auscultation terminal with arm circumference adaptive in this embodiment includes a terminal shell 1. A handle 11 is fixedly connected to one side of the terminal shell 1. A connecting rod 12 is rotatably connected to one side of the bottom end of the handle 11. Two limiting grooves 13 are opened at the bottom end of the terminal shell 1 to facilitate the lifting mechanism 3 to move up and down.

[0039] like Figures 1-8As shown, a locking mechanism 2 is installed at the bottom end of the connecting rod 12. The locking mechanism 2 includes a mounting shell 201 with a ball head connected to the bottom end of the connecting rod 12. A first locking ring 202 is fixedly connected inside the mounting shell 201. A second locking ring 203 is rotatably connected to the first locking ring 202. The second locking ring 203 has multiple toothed grooves 204. A locking rod 205 is rotatably connected to the inner wall of the mounting shell 201 above the first locking ring 202. A limit strip 206 is slidably connected to the inner wall of the mounting shell 201 above the locking rod 205. A U-shaped elastic strip 207 is fixedly connected to the inner wall of the mounting shell 201 between the locking rod 205 and the limit strip 206. The inner front end of the shell 201 is rotatably connected to a rotating shaft 208. When the entire device is placed on the patient's arm 5, the second locking ring 203 and the first locking ring 202 are in the open state. The device passes through the arm 5 first, so that the auscultation mechanism 4 can be aligned with the fistula on the arm 5. The second locking ring 203 is pushed forcefully, so that the multiple grooves 204 on the second locking ring 203 quickly engage with the ratchet 2051, completing the closure of the second locking ring 203 and the first locking ring 202. Thus, the entire device is placed on the arm 5, which makes it convenient for medical staff to auscultate the fistula through the auscultation mechanism 4. The entire process can be completed by a single medical staff member without the need for multiple people to operate, and it is convenient for single-person operation.

[0040] like Figures 1-8As shown, a sliding groove 2011 is provided on one side of the mounting shell 201. Multiple ratchet teeth 2051 are provided at the bottom of the locking rod 205, and a protrusion 2052 is fixedly connected to the top of the locking rod 205. In the combined state, the multiple ratchet teeth 2051 engage with the corresponding tooth grooves 204. When the second locking ring 203 and the first locking ring 202 are in the closed state, the engagement of the multiple ratchet teeth 2051 with the corresponding tooth grooves 204 gives the second locking ring 203 and the first locking ring 202 a self-locking function, allowing the locking mechanism 2 to be stably fitted onto the arm 5. This enables a single medical staff member to quickly raise and lower the mechanism 3, precisely aligning the auscultation mechanism 4 with the fistula for auscultation. A groove 2061 and two slots 2063 are provided at the bottom of the limiting strip 206. A fixed protrusion 2052 is provided on one side of the limiting strip 206. A limiting block 2062 is fixedly connected. When the second locking ring 203 closes with the first locking ring 202, the protrusion 2052 aligns with the groove 2061. Pushing the limiting block 2062 forces the limiting strip 206 to move, causing the protrusion 2052 to displace the groove 2061, preventing the locking rod 205 from swinging up and down, and further improving the stability of the second locking ring 203 and the first locking ring 202 when they are closed. A locking block 2071 is fixedly connected to the top of the U-shaped spring strip 207. In the combined state, the locking block 2071 engages with the corresponding locking groove 2063. A push plate 2081 is fixedly connected to the center of the outer wall of the rotating shaft 208. A torsion spring 2082 is fixedly installed at one end of the outer wall of the rotating shaft 208, and a first rotating head 2083 is fixedly connected to the other end of the rotating shaft 208. 82 is fixedly connected to the inner wall of the mounting shell 201. When multiple ratchet teeth 2051 engage with the corresponding tooth grooves 204, the second locking ring 203 pushes the locking rod 205 to swing, causing the locking rod 205 to push the U-shaped spring strip 207. The U-shaped spring strip 207 has an elastic effect, allowing the locking rod 205 to return to its original swing position. This allows multiple ratchet teeth 2051 to engage with the designated tooth grooves 204, resulting in different closing diameters for the second locking ring 203 and the first locking ring 202, thus satisfying the needs of different patients' arm dimensions. When the limiting strip 206 moves to the designated position, the locking block 2071 engages with the corresponding locking groove 2063 to prevent the limiting strip 206 from sliding, thereby improving the stability when the second locking ring 203 and the first locking ring 202 are closed. When it is necessary to open the second locking ring 203 and the first locking ring 202, first reverse the first rotating head 2083, thereby driving the rotating shaft 208 to rotate, thereby driving the push plate 2081 to rotate, so that the push plate 2081 pushes the limiting strip 206, so that the protrusion 2052 aligns with the groove 2061. Then rotate the first rotating head 2083 clockwise, driving the push plate 2081 to push the locking rod 205, so that the locking rod 205 swings upward, thereby separating the multiple ratchet teeth 2051 from the tooth groove 204. At this time, the second locking ring 203 can be opened, thereby disassembling the entire device from the patient's arm 5. After the rotating shaft 208 is rotated, it can be reset by the torsion spring 2082. The operation is simple, and the locking mechanism 2 can be stably fitted on the patient's arm 5, which makes it convenient for medical staff to auscultate the fistula through the auscultation mechanism 4.

[0041] like Figures 1-10 As shown, a lifting mechanism 3 is installed inside the terminal housing 1. The lifting mechanism 3 includes a mounting plate 301 fixedly connected to the inner wall of the terminal housing 1. A ring seat 302 is rotatably connected to the bottom center of the mounting plate 301. A worm gear 303 is fixedly connected to the bottom end of the ring seat 302. A threaded rod 304 is fixedly connected to the inner wall of the worm gear 303. A cavity 305 is opened in the center of the threaded rod 304. Two mounting seats 306 are fixedly connected to one side of the bottom of the mounting plate 301. A worm gear 307 is rotatably connected between the two mounting seats 306. A second rotating head 308 is fixedly connected to one end of the worm gear 307. A threaded sleeve 309 is threadedly connected to the outer wall of the threaded rod 304. Two limiting rods 310 are fixedly connected to the outer wall. When the entire device is placed on the patient's arm 5, one hand holds the handle 11. At this time, the index finger moves the second rotating head 308, which drives the worm gear 307 to rotate, which in turn drives the worm wheel 303 to rotate, which in turn drives the threaded rod 304 to rotate, which in turn drives the threaded sleeve 309 to descend within the terminal housing 1, thereby driving the auscultation mechanism 4 to descend and fit against the patient's arm 5 for convenient auscultation. The worm gear 307 and the worm wheel 303 are engaged. The two limiting rods 310 are slidably connected to the corresponding limiting grooves 13. Under the action of the limiting rods 310 and the limiting grooves 13, when the threaded rod 304 drives the threaded sleeve 309 to rotate, it can drive the sleeve to move up and down.

[0042] like Figures 1-10As shown, a stethoscope mechanism 4 is installed at the bottom of the lifting mechanism 3. The stethoscope mechanism 4 includes a microphone 401 fixedly connected to the bottom of the threaded sleeve 309. A flexible sealing skirt 402 is fixedly connected to the bottom of the microphone 401. A circuit board 403 is fixedly connected to the top of the mounting plate 301. A signal processor 404 is installed on the top of the circuit board 403. A sound guide channel 405 is installed inside the cavity 305. A sound sensor 406 is fixedly installed inside the microphone 401. Under the action of the lifting mechanism 3, the microphone 401 quickly fits against the fistula position in the patient's arm 5. Since a Bluetooth chip is installed on the circuit board 403, medical staff only need to turn on their mobile phones and connect to the device via Bluetooth. At this time, the sound of blood flow at the fistula in the arm 5 is transmitted to the device. The sound sensor 406 transmits information to the signal processor 404 via the sound channel 405, which then processes the information. Medical staff can receive the information via their mobile phones to determine if there are any abnormalities in the arteriovenous fistula. The operation is simple. The flexible sealing skirt 402 is made of medical-grade silicone. The top of the sound channel 405 is fixedly connected to the signal processor 404, and the bottom of the sound channel 405 is fixedly connected to the sound sensor 406. The flexible sealing skirt 402 can elastically deform under slight pressure, automatically conforming to the curved surface of the arm 5 with different diameters to form an independent and closed air storage cavity, thereby ensuring the sealing of the auscultation pickup process and the accuracy of signal acquisition, and greatly improving the population compatibility of the device.

[0043] The working principle of this embodiment is as follows: When the entire device is put on the patient's arm 5, the second locking ring 203 and the first locking ring 202 are in the open state. First, it passes through the arm 5 so that the auscultation mechanism 4 can be aligned with the fistula on the arm 5. Push the second locking ring 203 forcefully so that the multiple grooves 204 on the second locking ring 203 quickly engage with the ratchet 2051, and the second locking ring 203 and the first locking ring 202 are closed. At this time, the locking block 2071 engages with the corresponding locking groove 2063 to prevent the limiting strip 206 from sliding, thereby putting the entire device on the arm 5.

[0044] The medical staff holds the handle 11 with one hand, and at this time, the index finger rotates the second rotating head 308, which drives the worm gear 307 to rotate, which in turn drives the worm wheel 303 to rotate, which in turn drives the threaded rod 304 to rotate, which in turn drives the threaded sleeve 309 to descend within the terminal housing 1, thereby driving the pickup cover 401 to descend. The flexible sealing skirt 402 fits against the fistula position in the patient's arm 5. The flexible sealing skirt 402 can elastically deform under slight pressure, automatically fitting the curved surface of the arm 5 of different diameters to form an independent and closed air storage cavity, thereby ensuring the sealing of the auscultation pickup link and the accuracy of signal acquisition, greatly improving the population compatibility of the device. Since a Bluetooth chip is installed on the circuit board 403, the medical staff only needs to turn on the mobile phone, connect to the Bluetooth of the device, and the sound of blood flow at the fistula in the arm 5 is transmitted to the sound sensor 406, and then the information is transmitted to the signal processor 404 through the sound channel 405, so that the signal processor 404 processes the information. The medical staff can receive the information through the mobile phone to determine whether there is any abnormality in the fistula.

[0045] After auscultation, first reverse the first rotating head 2083, thereby driving the rotating shaft 208 to rotate, which in turn drives the push plate 2081 to rotate, causing the push plate 2081 to push the limiting strip 206, so that the protrusion 2052 aligns with the groove 2061. Then rotate the first rotating head 2083 clockwise, driving the push plate 2081 to push the locking rod 205, causing the locking rod 205 to swing upward, thereby separating the multiple ratchet teeth 2051 from the tooth groove 204. At this time, the second locking ring 203 can be opened, thereby disassembling the entire device from the patient's arm 5. The operation is simple.

[0046] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "setting," and "forming" should be interpreted broadly; for example, they can refer to fixed connections or settings, detachable connections or settings, or integrated structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components; those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In the description of this invention, references to terms such as “embodiment,” “specific example,” or “practical application” indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment or example of the invention; the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example, and the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A portable autogenous arteriovenous fistula auscultation terminal with arm circumference adaptation, comprising a terminal housing (1), characterized in that: A handle (11) is fixedly connected to one side of the terminal housing (1), and a connecting rod (12) is rotatably connected to one side of the bottom end of the handle (11). A locking mechanism (2) is installed at the bottom of the connecting rod (12), a lifting mechanism (3) is installed inside the terminal housing (1), and a stethoscope mechanism (4) is installed at the bottom of the lifting mechanism (3).

2. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 1, characterized in that, The bottom of the terminal housing (1) has two limiting grooves (13).

3. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 1, characterized in that, The locking mechanism (2) includes a mounting shell (201) with a ball head connected to the bottom end of the connecting rod (12). A first locking ring (202) is fixedly connected inside the mounting shell (201). A second locking ring (203) is rotatably connected to the first locking ring (202). A plurality of toothed grooves (204) are provided on the second locking ring (203). A locking rod (205) is rotatably connected above the first locking ring (202) on the inner wall of the mounting shell (201). A limiting strip (206) is slidably connected above the locking rod (205) on the inner wall of the mounting shell (201). A U-shaped elastic strip (207) is fixedly connected between the locking rod (205) and the limiting strip (206) on the inner wall of the mounting shell (201). A rotating shaft (208) is rotatably connected to the front end of the inner part of the mounting shell (201).

4. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 3, characterized in that, The mounting housing (201) has a sliding groove (2011) on one side, and the bottom end of the locking rod (205) is provided with multiple ratchet teeth (2051). The top end of the locking rod (205) is fixedly connected with a protrusion (2052). In the combined state, the multiple ratchet teeth (2051) mesh with the corresponding tooth grooves (204).

5. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 4, characterized in that, The bottom end of the limiting strip (206) is provided with a groove (2061) and two slots (2063), and a limiting block (2062) is fixedly connected to one side of the limiting strip (206).

6. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 5, characterized in that, The top of the U-shaped elastic bar (207) is fixedly connected to a locking block (2071). In the combined state, the locking block (2071) fits into the corresponding locking slot (2063). The center of the outer wall of the rotating shaft (208) is fixedly connected to a push plate (2081). One end of the outer wall of the rotating shaft (208) is fixedly installed with a torsion spring (2082). The other end of the rotating shaft (208) is fixedly connected to a first rotating head (2083). The torsion spring (2082) is fixedly connected to the inner wall of the mounting shell (201).

7. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 2, characterized in that, The lifting mechanism (3) includes a mounting plate (301) fixedly connected to the inner wall of the terminal housing (1). A ring seat (302) is rotatably connected to the bottom center of the mounting plate (301). A worm gear (303) is fixedly connected to the bottom end of the ring seat (302). A threaded rod (304) is fixedly connected to the inner wall of the worm gear (303). A cavity (305) is opened in the center of the threaded rod (304). Two mounting seats (306) are fixedly connected to one side of the bottom of the mounting plate (301). A worm (307) is rotatably connected between the two mounting seats (306). A second rotating head (308) is fixedly connected to one end of the worm (307). A threaded sleeve (309) is threadedly connected to the outer wall of the threaded rod (304). Two limiting rods (310) are fixedly connected to the outer wall of the threaded sleeve (309).

8. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 7, characterized in that, The worm (307) meshes with the worm wheel (303), and the two limiting rods (310) are slidably connected to the corresponding limiting grooves (13).

9. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 7, characterized in that, The auscultation device (4) includes a pickup cover (401) fixedly connected to the bottom end of the threaded sleeve (309). A flexible sealing skirt (402) is fixedly connected to the bottom end of the pickup cover (401). A circuit board (403) is fixedly connected to the top end of the mounting plate (301). A signal processor (404) is installed on the top of the circuit board (403). A sound guide channel (405) is installed in the cavity (305). A sound sensor (406) is fixedly installed inside the pickup cover (401).

10. The arm circumference adaptive portable autologous arteriovenous fistula auscultation terminal according to claim 9, characterized in that, The flexible sealing skirt (402) is made of medical-grade silicone. The top end of the sound channel (405) is fixedly connected to the signal processor (404), and the bottom end of the sound channel (405) is fixedly connected to the sound sensor (406).

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