A monitoring device for monitoring stenosis after arteriovenous fistulaplasty

Abstract

This invention provides a stenosis monitoring device after arteriovenous fistula (AVF) repair surgery, comprising a housing, a wristband connected to one side of the housing, a data acquisition pad installed in the middle of the inner side of the wristband, a vibration sensor installed on the side of the data acquisition pad away from the wristband, and a sound sensor and a pressure sensor installed on the data acquisition pad, located on the side of the vibration sensor. A through-slot is provided inside the housing, and a gear is installed on one side of the middle of the through-slot. This invention, through the wristband, vibration sensor, sound sensor, and pressure sensor, can automatically detect fistula thrills and murmurs via the vibration and sound sensors, increasing the accuracy of daily fistula examinations and effectively helping patients after AVF repair surgery to promptly detect fistula stenosis. The teeth and gears also allow for automatic wristband retraction, preventing the wristband from being too tight and compressing the fistula.

Description

Technical Field

[0001] This invention relates to the field of arteriovenous fistula stenosis diagnosis technology, and specifically to a stenosis monitoring device after arteriovenous fistula repair surgery. Background Technology

[0002] Arteriovenous fistula (AVF) is a surgical procedure mainly used in hemodialysis treatment in nephrology. An AVF is created by suturing an artery near the wrist in the forearm to a nearby vein, allowing arterial blood to flow through the anastomosed vein. The AVF provides sufficient blood for hemodialysis, ensuring adequate dialysis treatment, and is a commonly used vascular access for maintenance hemodialysis patients.

[0003] Because there is a maturation period (about one and a half months) after arteriovenous fistula formation surgery, the fistula can only be used after the doctor assesses that it is mature. During the maturation period, the patient needs to check the fistula at least three times a day to determine whether the fistula is patent. A successful fistula can be felt with a thrill and heard with a vascular murmur. When the fistula is narrowed, the thrill is weakened and a high-pitched murmur can be heard. When there is a thrombus in the fistula, neither a thrill can be felt nor a murmur can be heard. If the fistula is blocked, the patient needs to seek medical attention immediately.

[0004] However, due to a lack of diagnostic awareness, patients in clinical practice often fail to accurately examine arteriovenous fistulas and cannot perform regular and quantitative examinations. As a result, stenosis or blockage of the fistula often occurs during the mature stage. Clinically, there is a lack of instruments to diagnose fistula stenosis in order to help patients who have undergone arteriovenous fistula repair surgery to detect the problem of fistula stenosis in a timely manner, thereby avoiding the blockage of the fistula vessels. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention provides a stenosis monitoring device after arteriovenous fistula repair surgery.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A postoperative stenosis monitoring device for arteriovenous fistula repair includes a housing. A wristband is connected to one side of the housing. A data acquisition pad is installed in the middle of the inner side of the wristband. A vibration sensor, a sound sensor, and a pressure sensor are installed on the side of the data acquisition pad away from the wristband. A through-slot is provided inside the housing. One end of the wristband is fixedly connected to the end of the housing near the through-slot. The other end of the wristband passes through the through-slot from the other end of the housing. The outer surface of the other end of the wristband is provided with teeth. A motor is provided inside the housing. A rotating shaft is fixedly connected to the power output shaft of the motor. A gear is installed on the rotating shaft. One side of the gear extends towards the middle of the through-slot and meshes with the teeth on the outer surface of the wristband. A microprocessor is installed inside the housing and on the outer side of the motor away from the wristband. The vibration sensor, sound sensor, and pressure sensor are connected to the input terminal of the microprocessor through a circuit. An alarm connected to the output terminal of the microprocessor is also provided inside the housing.

[0008] In a preferred embodiment of the present invention, an air chamber is provided inside the housing near the wristband, and a pressure sensor is provided inside the air chamber. One end of the housing is provided with a connection hole communicating with the air chamber, and a venting connector is inserted into the connection hole. The outer end of the venting connector is connected to a balloon through a venting tube. The pressure sensor is connected to the input terminal of a microprocessor through a circuit.

[0009] In a preferred embodiment of the present invention, the sampling pad includes a base plate, an airbag cover, and a gas-guiding rotating handle; the base plate contacts and is rotatably fitted with the middle of the inner side of the wristband, the airbag cover is fitted onto the base plate, and an air cavity is formed between the airbag cover and the base plate; the vibration sensor, sound sensor, and pressure sensor are all disposed on the outer side of the airbag cover away from the base plate; the wristband has a mounting hole perpendicular to the surface of the wristband in its middle, and an annular groove is provided in the middle of the mounting hole along the circumferential direction; the gas-guiding rotating handle passes through the mounting hole and the base plate, and the gas-guiding rotating handle rotates and is sealed with both ends of the inner wall of the mounting hole through a sealing ring; the gas-guiding rotating handle is fixedly connected to the base plate. One end of the air guide rotary handle extends into the air chamber, and the other end of the air guide rotary handle is located on the outside of the wristband and forms a handle. One end of the air guide rotary handle is provided with an axial guide hole communicating with the air chamber. A radial guide hole is provided on the air guide rotary handle and located in the annular groove. One end of the radial guide hole communicates with the axial guide hole, and the other end of the radial guide hole communicates with the annular groove. An air passage I is provided in the wristband, and an air passage II is provided in the housing. The annular groove communicates with the air chamber through air passage I and air passage II. An electromagnetic valve for opening or closing air passage II is provided in air passage II near the air chamber. The electromagnetic valve is connected to the output terminal of the microprocessor.

[0010] As a preferred embodiment of the present invention, the thickness of the airbag cover near the vibration sensor, sound sensor and pressure sensor is less than the thickness of the rest of the parts.

[0011] As a preferred embodiment of the present invention, a display screen is mounted on the outer surface of the housing away from the wristband, and a rechargeable battery is also installed inside the housing. The display screen is connected to the output terminal of the microprocessor.

[0012] As a preferred embodiment of the present invention, the balloon is an elliptical balloon.

[0013] In a preferred embodiment of the present invention, a metal plate is installed at the bottom of the housing, a magnetic plate is disposed below the metal plate, and an adhesive strip is disposed at the bottom of the magnetic plate. The housing is magnetically connected to the magnetic plate through the metal plate.

[0014] As a preferred embodiment of the present invention, the side of the magnetic plate away from the shell has an inwardly concave arc-shaped surface.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The arteriovenous fistula postoperative stenosis monitoring device of the present invention, through the setting of a wristband, vibration sensor, sound sensor and pressure sensor, forms a ring by passing one end of the wristband through a through groove, and the shell and the collection pad can be worn on the upper and lower sides of the arm respectively, so that the vibration sensor and sound sensor on the collection pad contact the fistula of the patient's arm. The detection end of the vibration sensor contacts the fistula to detect whether the fistula blood vessel is vibrating, and the sound sensor receives the vascular murmur and transmits the sound wave vibration image data to the microprocessor. After processing by the microprocessor, it is displayed on the screen. When the fistula vibration is lower than the preset threshold or a high-pitched murmur is present, the microprocessor controls the alarm to sound, reminding the user of fistula stenosis. By automatically detecting fistula vibration and murmur through vibration sensor and sound sensor, the accuracy of daily fistula examination is increased, which can effectively help patients after arteriovenous fistula repair to detect fistula stenosis in time.

[0017] 2. The arteriovenous fistula postoperative stenosis monitoring device of the present invention, through the set teeth and gears, allows the wristband to be in a loose state or removed from the wrist when the fistula is not being detected. When the fistula is being detected, the motor drives the rotating shaft to rotate, the rotating shaft drives the gear to rotate, and the gear drives the teeth to move the wristband in the through groove, so that the wristband is tightened on the arm, causing the vibration sensor and sound sensor on the collection pad to be in close contact with the patient's fistula for detection, realizing the automatic contraction function of the wristband, and avoiding the wristband being worn too tightly on the arm and compressing the fistula.

[0018] 3. The arteriovenous fistula postoperative stenosis monitoring device of the present invention uses a metal plate, a magnetic plate and an adhesive tape. The magnetic plate is attached to the patient's arm by the adhesive tape. The bottom of the magnetic plate is arc-shaped and concave, which can make the magnetic plate fit tightly against the patient's arm. The shell is magnetically connected to the magnetic plate through the bottom metal plate. On the one hand, the shell can be quickly disassembled and assembled, which is convenient for the patient's daily use. On the other hand, the magnetic plate limits the shell, ensuring that the collection pad can accurately contact the fistula site with each wristband contraction.

[0019] 4. The arteriovenous fistula postoperative stenosis monitoring device of the present invention, by setting up a balloon, an air tube and a pressure sensor, allows the patient to manually press the balloon after the sutures are removed at the fistula site. This is done by inserting the air connector into the connection hole to connect the connection hole and the balloon. The patient can then manually press the balloon to train the arm and promote blood flow at the fistula site. When the balloon is compressed, the air pressure in the air tube and connection hole increases. The pressure sensor detects the increase in air pressure and transmits a signal to the microprocessor. The microprocessor receives the signal and counts and times the balloon pressing training, assisting the patient in hand movement training. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a stenosis monitoring device after arteriovenous fistula repair surgery;

[0021] Figure 2 This is a schematic diagram of the planar structure of a stenosis monitoring device after arteriovenous fistula repair surgery;

[0022] Figure 3 This is a schematic diagram of the internal structure of the shell;

[0023] Figure 4 This is a schematic diagram of the structure in which the shaft, gears, and motor are installed inside the housing;

[0024] Figure 5 This is a schematic diagram of the module connection structure;

[0025] Figure 6 This is a schematic diagram of the collection pad structure;

[0026] Figure 7 This is a schematic diagram of the structure with mounting holes on the wristband;

[0027] Figure 8 This is a schematic diagram of the air guide rotary handle;

[0028] Figure 9 This is a schematic diagram of the structure where the adhesive layer is set on the magnetic plate.

[0029] In the diagram: 1-Housing; 2-Wristband; 3-Data Acquisition Pad; 4-Vibration Sensor; 5-Sound Sensor; 6-Pressure Sensor; 7-Groove; 8-Tooth; 9-Gear; 10-Shaft; 11-Motor; 12-Microprocessor; 13-Alarm; 14-Display Screen; 15-Battery; 16-Metal Plate; 17-Magnetic Plate; 18-Adhesive Tape; 19-Connecting Hole; 20-Pressure Sensor; 21-Ventilation Connector; 22-Ventilation Tube; 23-Balloon; 24-Air Chamber; 25-Base Plate; 26-Airbag Cover; 27-Air Guide Rotating Handle; 28-Air Cavity; 29-Mounting Hole; 30-Annular Groove; 31-Sealing Ring; 32-Axial Guide Hole; 33-Radial Guide Hole; 34-Airway I; 35-Solenoid Valve. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the embodiments and accompanying drawings.

[0031] like Figure 1 As shown, a stenosis monitoring device after arteriovenous fistula repair surgery includes a housing 1. A wristband 2 is connected to one side of the housing 1. The wristband 2 unfolds into a rectangular strip and is made of rubber. A data acquisition pad 3 is installed in the middle of the inner side of the wristband 2. A vibration sensor 4, a sound sensor 5, and a pressure sensor 6 are installed on the side of the data acquisition pad 3 away from the wristband 2. The model of the vibration sensor 4 is selected according to the actual fistula thrill frequency and detection accuracy, and is used to detect whether there is a thrill in the fistula. The sound sensor 5 is located to one side of the vibration sensor 4 and is used to detect whether there is a murmur in the fistula blood vessel. The pressure sensor 6 is used to control the tightness of the wristband 2 during automatic contraction.

[0032] The housing 1 has a through groove 7 that penetrates the housing 1. One end of the wristband 2 is fixedly connected to the end of the housing 1 near the through groove 7, and the other end of the wristband 2 passes through the through groove 7 from the other end of the housing 1. The outer surface of the other end of the wristband 2 is provided with teeth 8, such as... Figure 2 , Figure 3 and Figure 4As shown. A motor 11 is installed inside the housing 1. A rotating shaft 10 is fixedly connected to the power output shaft of the motor 11. One end of the rotating shaft 10 is fixedly connected to the power output shaft of the motor 11, and the other end of the rotating shaft 10 is rotatably connected to the inner wall of the other side of the housing 1 via a bearing. A gear 9 is installed on the rotating shaft 10. One side of the gear 9 extends into the middle of the through groove 7 and meshes with the teeth 8 on the outer surface of the wristband 2. The motor 11 is a motor 11 with forward and reverse rotation circuits. When the motor 11 rotates, it drives the gear 9 to rotate via the rotating shaft 10, and the gear 9 drives the wristband 2 to move within the through groove 7. A microprocessor 12 is installed inside the housing 1, located on the outer side away from the motor 11 and away from the wristband 2. A vibration sensor 4, a sound sensor 5, and a pressure sensor 6 are connected to the input terminal of the microprocessor 12 via circuitry. An alarm 13 connected to the output terminal of the microprocessor 12 is also provided inside the housing 1. Figure 5 As shown. Alarm 13 is used to sound when the fistula thrill is below a threshold or when a high-pitched murmur is heard in the blood vessel, alerting the patient to fistula stenosis. A display screen 14 is mounted on the outer surface of the housing 1 away from the wristband 2. A battery 15 is also installed inside the housing 1. The display screen 14 is connected to the output of the microprocessor 12.

[0033] An air chamber 24 is provided inside the housing 1 near the wristband 2, and a pressure sensor 20 is installed inside the air chamber 24. Figure 2 and Figure 3 As shown, one end of the shell 1 is provided with a connection hole 19 communicating with the air chamber 24. A vent connector 21 is inserted into the connection hole 19. The outer wall of the vent connector 21 is covered with a rubber layer. When the vent connector 21 is inserted into the connection hole 19, it seals against the hole wall of the connection hole 19. The outer end of the vent connector 21 is connected to a balloon 23 through a vent tube 22. Figure 1 As shown. The air pressure sensor 20 is connected to the input terminal of the microprocessor 12 via a circuit to detect the air pressure at the connection port 19. The balloon 23 is an elliptical balloon, which is connected to the air chamber 24 via the ventilation tube 22 and the ventilation connector 21. The patient can manually press the balloon 23 to train the arm and promote blood flow at the fistula. The ventilation connector 21 can be easily installed and removed. When the balloon 23 is compressed, the gas inside the balloon 23 enters the air chamber 24 through the ventilation tube 22 and the ventilation connector 21, increasing the air pressure in the air chamber 24. The air pressure sensor 20 detects the increase in air pressure and transmits a signal to the microprocessor 12. The microprocessor 12 receives the signal and counts and times the balloon 23 pressing training to assist the patient in hand movement training.

[0034] The housing 1 and the collection pad 3 are worn on the patient's wrist via the wristband 2, allowing the patient to check for abnormalities in the arteriovenous fistula multiple times a day. Gear 9 drives toothed teeth 8 to move the wristband 2 within the through groove 7, tightening it on the arm. The wristband 2 moves the collection pad 3, causing the vibration sensor 4 and sound sensor 5 on the collection pad 3 to press firmly against the patient's arteriovenous fistula for detection. Simultaneously, the collection pad 3 compresses the arm, and the pressure sensor 6 transmits a signal to the microprocessor 12. When the pressure reaches a preset threshold, the microprocessor 12 controls the motor 11 to stop rotating, preventing the wristband 2 from tightening too much and affecting the arteriovenous fistula. Vibration sensor 4 detects whether the fistula vessel vibrates when it contacts the fistula and transmits the data to microprocessor 12. Before use, housing 1 needs to be set with a normal fistula vibration threshold for subsequent monitoring and comparison. If the detected vibration data is lower than the threshold, it indicates that there may be fistula stenosis. Sound sensor 5 receives vascular murmurs and transmits the acoustic vibration image data to microprocessor 12. After processing by microprocessor 12, the data is displayed on display screen 14. If the frequency of the acoustic vibration image is too fast or too dense, it indicates the presence of high-pitched murmurs. When the fistula vibration is lower than the preset threshold or when high-pitched murmurs are present, microprocessor 12 controls alarm 13 to sound an alarm, reminding the user that the fistula is stenotic and that they should seek medical attention promptly. The automatic retraction function of the wristband 2 can be achieved by the motor 11, the gear 9 and the toothed 8 on the outer surface of the other end of the wristband 2. When the fistula is not being detected, the wristband 2 is kept in a relaxed state or removed from the wrist. When the fistula is being detected, the wristband 2 is retracted to prevent the wristband 2 from being worn too tightly on the arm and compressing the fistula. After the detection is completed, the motor 11 rotates in the opposite direction, which drives the gear 9 to rotate in the opposite direction. The gear 9 drives the wristband to extend and maintain a relaxed state.

[0035] Because the shape of the corresponding suture site on a patient's arm varies after vein suturing, most patients will develop a bulge at the suture site, and the shape of this bulge also varies. Since the data collection pad 3 is located near the suture site, the vibration sensor 4, sound sensor 5, and pressure sensor 6 on the data collection pad 3 sometimes cannot accurately contact the fistula site, leading to inaccurate monitoring. This invention adopts the following structure for the data collection pad 3: Figure 6 , Figure 7 and Figure 8As shown, the sampling pad 3 includes a base plate 25, an airbag cover 26, and an air-guiding rotating handle 27. The base plate 25 contacts the center of the inner side of the wristband 2 and is rotatably fitted. The airbag cover 26 is fitted onto the base plate 25, forming an air cavity 28 between the airbag cover 26 and the base plate 25. The vibration sensor 4, sound sensor 5, and pressure sensor 6 are all disposed on the outer side of the airbag cover 26 away from the base plate 25. In this embodiment, a set of vibration sensor 4, sound sensor 5, and pressure sensor 6 is used. To further improve monitoring accuracy, multiple sets of vibration sensor 4, sound sensor 5, and pressure sensor 6 can be disposed on the outer side of the airbag cover 26. The wristband 2 has a mounting hole 29 perpendicular to the surface of the wristband 2 in the center. The base plate 25 has a through hole in the center. An annular groove 30 is provided in the center of the mounting hole 29 along the circumferential direction. Figure 7 As shown, the air guide rotating handle 27 passes through the mounting hole 29 and the through hole on the base plate 25. The air guide rotating handle 27 rotates and seals against the inner wall of the mounting hole 29 at both ends through the sealing ring 31. The air guide rotating handle 27 is fixedly connected to the base plate 25. One end of the air guide rotating handle 27 extends into the air chamber 28, and the other end is located on the outside of the wristband 2 and forms a handle. By rotating the air guide rotating handle 27, the air guide rotating handle 27 drives the base plate 25 and the airbag cover 26 to rotate together, thereby changing the position of the vibration sensor 4, the sound sensor 5, and the pressure sensor 6, so that the vibration sensor 4, the sound sensor 5, and the pressure sensor 6 can better fit the fistula site. One end of the air guide rotating handle 27 is provided with an axial guide hole 32 that communicates with the air chamber 28. Figure 8As shown, a radial guide hole 33 is radially arranged on the air guide rotating handle 27 and located within the annular groove 30. In this embodiment, multiple radial guide holes 33 are evenly distributed in the circumferential direction of the air guide rotating handle 27. One end of the radial guide hole 33 communicates with the axial guide hole 32, and the other end of the radial guide hole 33 communicates with the annular groove 30. An air passage I 34 is provided in the wristband 2, and an air passage II is provided in the housing 1. The annular groove 30 communicates with the air chamber 24 through the air passage I 34 and the air passage II. A solenoid valve 35 for opening or closing the air passage II is provided near the air chamber 24 in the air passage II. The solenoid valve 35 is connected to the output terminal of the microprocessor 12. Open the solenoid valve 35 and manually press the balloon 23. The gas inside the balloon 23 enters the air chamber 28 through the trachea 22, the venting connector 21, the air chamber 24, the solenoid valve 35, airway II, airway I 34, the annular groove 30, the radial guide hole 33, and the axial guide hole 32. The pressure in the air chamber 28 increases, and the balloon cover 26 bulges outward. The vibration sensor 4, the sound sensor 5, and the pressure sensor 6 also move outward, allowing for better contact with the fistula in the patient's arm. If, during monitoring, the vibration sensor 4, the sound sensor 5, and the pressure sensor 6 are slightly misaligned with the fistula in the patient's arm, the position of the vibration sensor 4, the sound sensor 5, and the pressure sensor 6 can be adjusted by rotating the air guide handle 27. In this embodiment, the thickness of the airbag cover 26 near the vibration sensor 4, sound sensor 5, and pressure sensor 6 is less than the thickness of the rest of the cover. When the gas pressure inside the airbag cover 26 increases, the thinner portion of the cover 26 first undergoes elastic deformation and bulges outward. Therefore, the vibration sensor 4, sound sensor 5, and pressure sensor 6 can more easily contact the fistula in the patient's arm. After monitoring is complete, the balloon 23 is released, and the pressurized gas in the air chamber 28 returns to the balloon 23, reducing the pressure inside. The solenoid valve 35 is then closed. After the solenoid valve 35 is closed, squeezing the balloon 23 again can train the arm and promote blood flow to the fistula.

[0036] A metal plate 16 is mounted on the bottom of the housing 1. The metal plate 16 is made of magnetically adsorbable metal. A magnetic plate 17 is located below the metal plate 16, and an adhesive strip 18 is located on the bottom of the magnetic plate 17. Figure 9 As shown, the housing 1 is magnetically connected to the magnetic plate 17 via the metal plate 16, enabling quick assembly and disassembly of the housing 1. The housing 1 can be temporarily removed during showering to prevent water damage and facilitate daily use by the patient. The side of the magnetic plate 17 away from the housing 1 has a concave arc shape. The magnetic plate 17 is attached to the upper surface of the patient's arm using adhesive tape 18. The bottom of the magnetic plate 17 has an arc-shaped concave design, allowing it to fit snugly against the patient's arm. Double-sided adhesive tape can be used for the adhesive tape 18.

[0037] This arteriovenous fistula (AVF) stenosis monitoring device is not only suitable for medical personnel but also convenient for patients to monitor at home. When using this device after AVF stenosis surgery, patients first determine the location of the fistula to be monitored. The magnetic plate 17 is then attached to the patient's arm using adhesive tape 18. The bottom of the magnetic plate 17 is concave, allowing it to fit snugly against the patient's arm. The arm is then passed through the wristband 2, and the metal plate 16 at the bottom of the housing 1 is magnetically connected to the magnetic plate 17, thus mounting the housing 1 on the arm. When not monitoring the fistula, the wristband 2 is in a relaxed state, and the collection pad 3 does not compress the arm. When monitoring the fistula, the motor 11 drives the rotating shaft 10 to rotate, which in turn drives the gear 9. The gear 9 drives the toothed groove 8 to move the wristband 2 within the through groove 7, tightening the wristband 2 on the arm and facilitating the collection process. When the vibration sensor 4, sound sensor 5, and pressure sensor 6 on the collection pad 3 are brought close to the patient's arteriovenous fistula, the solenoid valve 35 is activated, squeezing the balloon 23. The gas pressure in the air chamber 28 increases, and the balloon cover 26 bulges outward, causing the vibration sensor 4, sound sensor 5, and pressure sensor 6 to press tightly against the patient's arteriovenous fistula. The pressure sensor 6 detects the tightening pressure of the wristband 2. After the wristband 2 is tightened to a preset degree, the motor 11 is turned off. The detection end of the vibration sensor 4 contacts the arteriovenous fistula to detect whether the fistula vessel is vibrating and transmits the detection data to the microprocessor 12. The sound sensor 5 receives the vascular murmur and transmits the sound wave vibration image data to the microprocessor 12. After processing by the microprocessor 12, the data is displayed on the screen 14. When the arteriovenous fistula vibration is lower than the preset threshold or a high-pitched murmur occurs, the microprocessor 12 controls the alarm 13 to sound an alarm, reminding the user of arteriovenous fistula stenosis. After the solenoid valve 35 is closed, the patient manually presses the balloon 23 to train the arm and promote blood flow at the fistula. After the balloon 23 is compressed, the air pressure in the air chamber 24 increases. The air pressure sensor 20 detects the increase in air pressure and transmits the signal to the microprocessor 12. The microprocessor 12 receives the signal and counts and times the balloon 23 pressing training.

[0038] Finally, it should be noted that 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An instrument for monitoring stenosis after arteriovenous fistuloplasty, comprising a housing (1), characterized in that: A wristband (2) is connected to one side of the housing (1). A collection pad (3) is installed in the middle of the inner side of the wristband (2). A vibration sensor (4), a sound sensor (5), and a pressure sensor (6) are installed on the side of the collection pad (3) away from the wristband (2). A through groove (7) is provided inside the housing (1). One end of the wristband (2) is fixedly connected to the end of the housing (1) near the through groove (7). The other end of the wristband (2) passes through the through groove (7) from the other end of the housing (1). Teeth (8) are provided on the outer surface of the other end of the wristband (2). An electric... The motor (11) has a rotating shaft (10) fixedly connected to its power output shaft. A gear (9) is installed on the rotating shaft (10). One side of the gear (9) extends into the middle of the through groove (7) and meshes with the teeth (8) on the outer surface of the wristband (2). A microprocessor (12) is installed inside the housing (1) and on the outside of the motor (11) away from the wristband (2). The vibration sensor (4), sound sensor (5) and pressure sensor (6) are connected to the input terminal of the microprocessor (12) through a circuit. An alarm (13) connected to the output terminal of the microprocessor (12) is also provided inside the housing (1). An air chamber (24) is provided inside the housing (1) near the wristband (2). A pressure sensor (20) is provided inside the air chamber (24). A connection hole (19) communicating with the air chamber (24) is provided at one end of the housing (1). A venting connector (21) is inserted into the connection hole (19). The outer end of the venting connector (21) is connected to a balloon (23) through a venting tube (22). The pressure sensor (20) is connected to the input terminal of the microprocessor (12) through a circuit. The collection pad (3) includes a base plate (25), an airbag cover (26), and an air guide rotating handle (27); the base plate (25) contacts the middle of the inner side of the wristband (2) and is rotatably fitted; the airbag cover (26) is fitted onto the base plate (25), and an air cavity (28) is formed between the airbag cover (26) and the base plate (25); the vibration sensor (4), the sound sensor (5), and the pressure sensor (6) are all located on the airbag cover (26) away from the base plate (25). On the outer surface, the wristband (2) has a mounting hole (29) perpendicular to the surface of the wristband (2) in the middle. The mounting hole (29) has an annular groove (30) in the circumferential direction in the middle. The air guide rotating handle (27) passes through the mounting hole (29) and the base plate (25). The air guide rotating handle (27) rotates and seals with the inner wall of the mounting hole (29) at both ends through a sealing ring (31). The air guide rotating handle (27) is fixedly connected to the base plate (25). One end of the air guide rotating handle (27) extends into the air chamber (28), and the other end of the air guide rotating handle (27) is located outside the wristband (2) and forms a handle. One end of the air guide rotating handle (27) is provided with an axial guide hole (32) communicating with the air chamber (28) along the axial direction. A radial guide hole (33) is provided on the air guide rotating handle (27) and located in the annular groove (30) along the radial direction. One end of the radial guide hole (33) is connected to the axial guide hole (32). The radial guide hole (33) is connected to the annular groove (30) at the other end. An air passage I (34) is provided in the wristband (2), and an air passage II is provided in the housing (1). The annular groove (30) is connected to the air chamber (24) through the air passage I (34) and the air passage II. An electromagnetic valve (35) for opening or closing the air passage II is provided in the air passage II near the air chamber (24). The electromagnetic valve (35) is connected to the output end of the microprocessor (12). The thickness of the airbag cover (26) near the vibration sensor (4), sound sensor (5) and pressure sensor (6) is less than the thickness of the rest of the parts; A metal plate (16) is installed at the bottom of the housing (1), and a magnetic plate (17) is provided below the metal plate (16). An adhesive strip (18) is provided at the bottom of the magnetic plate (17). The housing (1) is magnetically connected to the magnetic plate (17) through the metal plate (16).

2. The arteriovenous fistula postoperative stenosis monitoring device according to claim 1, characterized in that: A display screen (14) is mounted on the outer surface of the housing (1) away from the wristband (2). A battery (15) is also installed inside the housing (1). The display screen (14) is connected to the output terminal of the microprocessor (12).

3. The arteriovenous fistula postoperative stenosis monitoring device according to claim 2, characterized in that: The balloon (23) is an elliptical balloon.

4. The arteriovenous fistula postoperative stenosis monitoring device according to claim 3, characterized in that: The magnetic plate (17) has a concave arc-shaped surface on the side away from the shell (1).

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