Artificial anal sphincter system based on defecation perception

Abstract

The invention relates to an artificial anal sphincter system based on defecation perception. The artificial anal sphincter system comprises a defecation perception module, a driving module, an execution module, a control circuit and a single-chip microcomputer control module. The defecation perception module comprises a sensor, an alarm module and a screen display module; the defecation perception module, the driving module and the execution module are all connected with the control circuit. When the patient needs to defecate, the execution module controls the clamping mechanism to release the rectum, and normal defecation is carried out; after defecation is finished, the execution module clamps the rectum again, and the sensor replaces normal rectal nerves. Compared with the prior art, the device simulates the contraction mechanism of the sphincter, the movement of the upper clamping plate and the lower clamping plate acts on the intestinal canal, the closed state of the intestinal canal tissue is simulated, a complex mechanical structure is avoided, the effectiveness of the artificial sphincter is improved, the defecation sense sensing function of the rectum and the sphincter group is remodeled, and the practicability is higher.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an artificial anal sphincter system based on the perception of the urge to defecate. Background Technology

[0002] Fecal incontinence remains an unsolved medical problem, causing patients physical inconvenience and severe psychological distress. Treatment for fecal incontinence varies depending on the severity of the condition, including conservative and surgical approaches. For particularly severe cases, colostomy or artificial anal sphincter implantation is often necessary. Artificial anal sphincter implantation is a method for treating anal sphincter dysfunction. During the procedure, the surgeon implants an artificial sphincter into the existing anal sphincter to enhance its function. This artificial sphincter can be derived from tissue from other parts of the patient's body or made of artificial materials.

[0003] Normal human defecation is a complex process, and the defecation control and urge-to-defecation mechanisms are the two most crucial aspects, ensuring that intestinal pressure remains within a safe range. Chinese patent CN103393480B discloses an artificial anal sphincter prosthesis based on elastic scaling. A pressure sensor built into the prosthesis senses changes in intestinal pressure. When defecation is needed, a drive device automatically opens the prosthesis to an appropriate degree based on pressure sensing, initiating defecation. After defecation, when defecation control is required, the prosthesis automatically closes, closing to an appropriate degree based on pressure sensing and closed-loop control. While this patent achieves defecation control, it lacks an urge-to-defecation function. This can cause patients to frequently miss appropriate defecation opportunities, leading to intestinal blood supply difficulties and ultimately serious complications such as tissue necrosis. The presence of localized high-pressure areas further exacerbates this phenomenon.

[0004] Current research and development of artificial anal sphincter systems, both domestically and internationally, primarily focuses on sealing the artificial anus and controlling defecation. However, progress remains limited in addressing the relationship between stoma leakage and intestinal ischemia, as well as common complications such as stoma and surrounding skin infections. This is mainly due to biomechanical mismatch issues arising from long-term morphological changes in the tissues surrounding the implant in artificial sphincter research, leading to failure, ischemic necrosis, or tissue atrophy. Furthermore, currently used artificial anal sphincter systems in clinical practice rely solely on patients periodically opening and closing the sealing device to control defecation; they lack the ability to perceive defecation and cannot effectively distinguish the nature of intestinal contents.

[0005] Therefore, given the shortcomings of existing artificial anal sphincter systems in clinical or experimental stages, further improvements are needed to ensure the safety and effectiveness of artificial anal sphincter systems. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an artificial anal sphincter system based on the perception of defecation urges. By mimicking the sphincter contraction mechanism and using a combination of microcontroller and prosthetic device, the defecation urge perception function of the rectum and sphincter group is reshaped. This not only ensures safety and effectiveness but also enables real-time monitoring and perception of defecation urges. Furthermore, it can classify intestinal contents, thereby reshaping the human body's ability to perceive defecation urges.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] This invention provides an artificial anal sphincter system based on defecation urge sensing, including a defecation urge sensing module, a drive module, an execution module, a control circuit, and a microcontroller control module;

[0009] The defecation sensing module, driving module, and execution module are all connected to the control circuit.

[0010] The microcontroller control module is soldered to the pin header and control circuit.

[0011] The defecation sensing module includes a sensor, an alarm module, and a screen display module;

[0012] When the patient needs to defecate, the execution module controls the clamping mechanism to release the rectum for normal defecation; after defecation, the execution module clamps the rectum again; the sensor replaces the rectal nerve, detecting the pressure inside the rectum and determining the amount of stool, thus replacing the normal rectal nerve's sensing function for defecation requests; when the amount of stool detected by the microcontroller control module exceeds a set threshold, the alarm module reminds the patient to prepare for defecation; the control system, composed of the microcontroller control module, drive module, alarm module, and control circuit, controls the anal sphincter to open and close at the appropriate time, replacing the central nervous system's control ability during defecation.

[0013] In one embodiment of the present invention, the sensor includes a first sensor and a second sensor;

[0014] The first and second sensors are connected to the microcontroller control module via a control circuit;

[0015] The alarm module includes an LED light and a buzzer. When intestinal contents accumulate to the point where they need to be expelled, the LED light flashes continuously, and the buzzer sounds an alarm, together reminding the patient to defecate, thus serving as a defecation reminder.

[0016] The screen display module is used to display the values ​​detected by the first and second sensors and the state of intestinal contents discharge, for real-time monitoring of defecation dynamics.

[0017] In one embodiment of the present invention, the first sensor is a strip-shaped thin-film flexible pressure sensor. The first sensor is wrapped around the surface of the intestinal tract and is used to detect the pressure value on the surface of the intestinal tract and indirectly detect the amount of intestinal contents in order to determine the timing of defecation.

[0018] The second sensor is a humidity sensor. The electrodes of the second sensor are made of copper foil and the surface is plated with nickel. The second sensor is used to detect and classify the excreted intestinal contents.

[0019] In one embodiment of the present invention, the microcontroller control module is an STM32F103 microcontroller;

[0020] The drive module includes a driver and a stepper motor. The driver is a Yaskawa-CA230 driver, and the stepper motor is a Yaskawa-20HD1401 stepper motor.

[0021] In one embodiment of the present invention, the execution module includes, from top to bottom, an upper top plate, an upper movable plate, a lower movable plate, an upper clamping plate, a lower clamping plate, and a lower bottom plate;

[0022] The upper top plate is elliptical, and the center of the upper top plate is provided with four M2 threaded holes and one circular hole for connection with the stepper motor.

[0023] The upper movable plate is elliptical and is fixed between the upper top plate and the lower movable plate;

[0024] The upper clamping plate is connected to the lower end of the lower movable plate, and the lower clamping plate is connected to the lower base plate. Both the upper and lower clamping plates are made of polyetheretherketone (PEEK), and the outer sides of both the upper and lower clamping plates are wrapped with a medical silicone film.

[0025] In one embodiment of the present invention, the execution module further includes a weight pan, a first constant force spring, and a second constant force spring;

[0026] The weight pan has a first threaded hole in the middle, which is connected to the motor screw of the stepper motor. Three second threaded holes are evenly distributed around the first threaded hole. The weight pan is fixed to the upper end of the upper movable plate through the three second threaded holes.

[0027] One end of the first constant force spring and the second constant force spring are both connected to the lower end of the upper movable plate, and the other end is connected to the upper end of the lower movable plate. The first constant force spring and the second constant force spring are respectively fixed at both ends between the upper movable plate and the lower movable plate.

[0028] The first constant force spring and the second constant force spring are nickel-titanium springs.

[0029] In one embodiment of the present invention, the execution module further includes a left support frame and a right support frame;

[0030] The top plate has three evenly distributed M3 threaded holes on each side for screwing into the left and right support frames.

[0031] The bottom plate has three M2 threaded holes on each side for screwing into the left and right support frames.

[0032] The outer sides of the left and right support frames are generally arc-shaped, and the left and right support frames are also provided with elliptical sliding grooves. The sliding grooves are respectively connected to the protrusions on the upper movable plate and the lower movable plate to realize the up and down opening and closing movement of the execution module.

[0033] In one embodiment of the present invention, the upper movable plate and the lower movable plate are each provided with two holes, and the holes of the upper movable plate are connected to the holes of the lower movable plate by a flexible rope to enhance the fixation between the first constant force spring and the second constant force spring.

[0034] In one embodiment of the present invention, the microcontroller control module is an STM32F103 microcontroller, and a development board with the STM32F103ZET6 as the main chip is used. The chip adopts LOFP packaging. The microcontroller control module serves as the control unit of the entire system and is used for signal conversion and control.

[0035] In one embodiment of the present invention, a power management module for power supply is also included. The power management module includes a 24V rechargeable lithium battery with a rated capacity of 2600mAh and a weight of 300g. The power management module is used to supply power to the system.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] 1. This invention mimics the sphincter contraction mechanism and utilizes the movement of upper and lower splints to simulate the closed state of intestinal tissue, avoiding complex mechanical structures and improving the effectiveness of artificial sphincters.

[0038] 2. This invention utilizes a microcontroller to combine signal acquisition, signal processing, and a prosthetic device to simulate the normal defecation mechanism, thereby reshaping the rectum and sphincter muscles' function of sensing the urge to defecate.

[0039] 3. This invention utilizes a nickel-titanium spring made from a shape memory alloy wire with a Ni content of 55.6% through a heat treatment process to achieve constant force clamping of intestinal tissue. This avoids the device failing due to insufficient force applied to the intestinal tissue or causing local ischemia and necrosis of the intestinal tissue due to excessive force applied to the intestinal tissue, thus ensuring the safety and effectiveness of the device.

[0040] 4. This invention utilizes a pressure sensor to detect the pressure of the flexible intestine, thereby indirectly monitoring the amount of feces in the intestine. Through sensor technology, wireless communication technology, and pressure detection algorithms, the measured value of the pressure sensor is displayed in real time on an external display screen.

[0041] 5. This invention utilizes a humidity sensor to classify intestinal contents, and the method is simple and effective.

[0042] 6. The actuator in this invention has a simple structural design and is more practical for use in ostomy compared to the complexity and uncertainty of the internal environment. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structural composition of an artificial anal sphincter system based on the perception of the urge to defecate.

[0044] Figure 2 A schematic diagram of the defecation sensing module structure of an artificial anal sphincter system based on defecation urge sensing;

[0045] Figure 3 A schematic diagram of the drive module structure of an artificial anal sphincter system based on the perception of defecation urge;

[0046] Figure 4 This is a schematic diagram of the execution module structure of an artificial anal sphincter system based on the perception of the urge to defecate.

[0047] Figure 1 Explanation of the award number:

[0048] 1-Human intestine, 2-Defecation sensation module, 3-Drive module, 4-Execution module, 5-Control circuit, 6-Microcontroller control module, 7-Power management module;

[0049] Figure 2 Explanation of the award number:

[0050] 2-Defecation sensing module, 201-First sensor, 202-Second sensor, 203-Alarm module, 204-Screen display module;

[0051] Figure 3 Explanation of the award number:

[0052] 3-Drive module, 301-Driver, 302-Stepper motor;

[0053] Figure 4 Explanation of the award number:

[0054] 302-Stepper motor, 401-Upper top plate, 402-Weight pan, 403-Upper movable plate, 404-First constant force spring, 405-Second constant force spring, 406-Lower movable plate, 407-Upper clamping plate, 408-Lower clamping plate, 409-Lower bottom plate, 410-Left support frame, 411-Right support frame. Detailed Implementation

[0055] The following examples illustrate specific implementations of the present invention. These examples are carried out based on the solution described in the present invention, and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following examples.

[0056] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art. The directional terms such as "upper," "lower," "left," and "right" in this invention are described according to the accompanying drawings, and do not represent the specific location of the device in actual use.

[0057] Example 1

[0058] This embodiment provides an artificial anal sphincter system based on the perception of the urge to defecate, such as... Figure 1 As shown, the system includes a defecation sensing module 2, a drive module 3, an execution module 4, a control circuit 5, a microcontroller control module 6, and a power management module 7. The microcontroller control module 6 is soldered to the pin header and control circuit 5. The pin header is a type of connector with a pin pitch of 2.54mm, characterized by its long service life and resistance to detachment. The control circuit 5 serves as the connection line between the microcontroller control module 6 and other modules. The microcontroller control module 6 acts as the main brain of the entire system, using a development board with an STM32F103ZET6 as the main chip. The chip is in a LOFP package. The microcontroller control module 6 acts as the control unit of the entire system, playing a role in signal conversion and control. The defecation sensing module 2 includes a sensor, an alarm module 203, and a screen display module 204. Its main function is to detect the patient's real-time defecation dynamics and classify the intestinal contents.

[0059] The urge sensing module 2, drive module 3, and execution module 4 are all connected to the control circuit 5; the main function of the drive module 3 is to drive the stepper motor 302, thereby driving the execution module 4 to perform opening and closing actions;

[0060] The power management module 7 includes a power chip and a 24V rechargeable lithium battery, model 24V 2600mAh, with a rated capacity of 2600mAh and a weight of approximately 300g, which provides power for the entire system.

[0061] refer to Figure 2As shown, the defecation sensing module 2 includes a first sensor 201, a second sensor 202, an alarm module 203, and a screen display module 204. The first sensor 201 and the second sensor 202 are connected to the control circuit 5 and the microcontroller control module 6 via DuPont wires.

[0062] The first sensor 201 is a long, thin-film flexible pressure sensor with a thickness of 0.4 mm, a pressure sensing range of 20 g-10 kg, and an overall length of 110 mm. The first sensor 201 surrounds the surface of the intestinal tract to detect the surface pressure. As intestinal contents pass through the intestines, they exert force on the intestinal surface. The first sensor 201 indirectly detects the amount of intestinal contents, thus better determining the timing of defecation. The second sensor 202 is a humidity sensor. Its electrodes are made of copper foil, and its surface is nickel-plated to better prevent rust, improve conductivity, and extend service life. Since the humidity of different intestinal contents varies significantly, the second sensor 202 can detect and classify the expelled intestinal contents. Based on the classification results, the patient's bowel health can be assessed, allowing for appropriate treatment measures to improve the patient's health. The alarm module 203 consists of an LED light and a buzzer, serving as a defecation reminder. When intestinal contents accumulate to the point where they need to be expelled, the LED light flashes continuously, and the buzzer sounds an alarm, jointly reminding the patient to defecate. The screen display module 204 displays the values ​​detected by the first sensor 201 and the second sensor 202, as well as the state of intestinal contents expulsion. The screen display module 204 allows for real-time monitoring of bowel movement dynamics. A humidity sensor is used to classify intestinal contents; this method is simple and effective. A pressure sensor is used to detect the pressure of the flexible intestine, thereby indirectly monitoring the amount of feces in the intestine. Through sensor technology, wireless communication technology, and pressure detection algorithms, the pressure sensor measurements are displayed in real-time on an external display screen.

[0063] refer to Figure 3 As shown, the drive module 3 includes a driver 301 and a stepper motor 302. The driver 301 is a Yaskawa-CA230 driver. The stepper motor 302 is operated by setting the microstepping value, attenuation mode and current of the stepper motor driver. The stepper motor 302 and the driver 301 are connected by a common anode method. The stepper motor 302 is a Yaskawa-20HD1401 stepper motor.

[0064] refer to Figure 4 As shown, the execution module 4 includes an upper top plate 401, a weight plate 402, an upper movable plate 403, a first constant force spring 404, a second constant force spring 405, a lower movable plate 406, an upper clamping plate 407, a lower clamping plate 408, a lower bottom plate 409, a left support frame 410, and a right support frame 411.

[0065] The upper top plate 401 has an overall elliptical shape. At its center are four M2 threaded holes and one circular hole for engaging and fixing with the stepper motor 302. Three evenly distributed M3 threaded holes are located on each side of the upper top plate 401 for engaging and fixing with the left support frame 410 and the right support frame 411. The weight pan 402 connects to the motor screw and the upper movable plate 403. The weight pan 402 has a first threaded hole in its center for engaging with the screw of the stepper motor 302; three second threaded holes are evenly distributed around the first threaded hole for engaging and fixing with the upper movable plate 403. The upper movable plate 403 is connected to the weight pan 402 at its upper end and to the first constant force spring 404 and the second constant force spring 405 at its lower end. The upper movable plate 403 has an overall elliptical shape, with protrusions on both sides for engaging with the left support frame 410 and the right support frame 411.

[0066] The first constant force spring 404 and the second constant force spring 405 are nickel-titanium springs made of shape memory alloy wire with a Ni content of 55.6% through a heat treatment process. The constant force springs are selected with specific dimensions and specifications, achieving a constant force effect after compression. This ensures constant force clamping of the intestinal tissue, preventing device failure due to insufficient force or local ischemia and necrosis caused by excessive force, thus guaranteeing the safety and effectiveness of the device. The upper end of the lower movable plate 406 is connected to the first constant force spring 404 and the second constant force spring 405. The two ends of the lower movable plate 406 are connected to the left support frame 410 and the right support frame 411 respectively, and the lower end is connected to the upper clamping plate 407.

[0067] The upper clamping plate 407 and the lower clamping plate 408 are connected to the lower movable plate 406 and the lower base plate 409, respectively. Both the upper clamping plate 407 and the lower clamping plate 408 are made of polyetheretherketone (PEEK) material and are wrapped with a medical-grade silicone film on the outside. The upper end of the lower base plate 409 is connected to the support frame and the lower clamping plate 408, respectively. The lower base plate 409 is generally elliptical, and its two sides are provided with three M2 threaded holes that connect to and reinforce the left support frame 410 and the right support frame 411. The upper movable plate 403 and the lower movable plate 406 each have two holes on their left and right sides. One hole in the upper movable plate 403 is connected to one hole in the lower movable plate 406 by a flexible rope to reinforce the fixation between the first constant force spring 404 and the second constant force spring 405.

[0068] The upper ends of the left support frame 410 and the right support frame 411 are connected to the upper top plate 401, and the lower ends are connected to the lower bottom plate 409. The outer sides of the left support frame 410 and the right support frame 411 are generally arc-shaped. The left support frame 410 and the right support frame 411 are also provided with elliptical sliding grooves, which cooperate with the upper movable plate 403 and the lower movable plate 406 respectively to realize the up and down opening and closing movement of the execution module 4.

[0069] The working process of this invention is as follows: In the initial state, the intestinal tract is closed. When the intestinal contents accumulate to the pressure threshold required for defecation, the first sensor 201, which detects the pressure on the intestinal wall, transmits the pressure signal to the microcontroller control module 6. At this time, the microcontroller main control unit 6 controls the alarm module 203 to issue an alarm to remind the patient to defecate. Furthermore, when the patient presses the open button, the execution module 4 opens, the intestinal tract is slowly released, and the intestinal contents are expelled. The second sensor 202 can detect the expelled intestinal contents, classify them according to their different water contents, and determine their state. When the patient finishes defecation, they press the close button, the execution module 4 slowly closes, and the entire defecation control process ends. The execution module 4 has a simple structural design and is used for stoma care. Compared to the complexity and uncertainty of the internal environment, this device is more practical.

[0070] A first sensor 201 is placed at the end of the rectum to detect rectal pressure. This sensor replaces the rectal nerves, effectively determining the amount of stool in the rectum and generating feedback, thus replacing the normal rectal nerves' sensing function for defecation requests. A control system composed of a microcontroller main control unit 6, a drive module 3, an alarm module 203, and control circuitry controls the opening and closing of the anal sphincter at the appropriate time, solving problems such as achieving the appropriate opening degree when opening and maintaining appropriate pressure after closing, thus replacing the central nervous system's control ability during defecation. Through the sphincter contraction mechanism, the movement of the upper and lower sphincter plates simulates the closure state of the intestinal tissue, avoiding complex mechanical structures and improving the effectiveness of the artificial sphincter. The microcontroller combines signal acquisition, signal processing, and the prosthetic device to simulate the normal defecation mechanism, thereby reshaping the rectum and sphincter group's function of sensing the urge to defecate.

[0071] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. An artificial anal sphincter system based on the perception of the urge to defecate, characterized in that, It includes a defecation sensing module (2), a driving module (3), an execution module (4), a control circuit (5), and a microcontroller control module (6); The defecation sensing module (2), drive module (3) and execution module (4) are all connected to the control circuit (5); The single-chip microcomputer control module (6) is welded to the pin header and control circuit (5); The defecation sensing module (2) includes a sensor, an alarm module (203), and a screen display module (204); When the patient needs to defecate, the execution module (4) controls the clamping mechanism to release the rectum for normal defecation; after defecation, the execution module (4) clamps the rectum again; the sensor is used to replace the rectal nerve, detects the pressure in the rectum and judges the amount of feces in the rectum, replacing the normal rectal nerve's sensing function for defecation requests; when the amount of feces detected by the microcontroller control module (6) exceeds the set threshold, the alarm module (203) reminds the patient to prepare for defecation; the control system is composed of the microcontroller control module (6), the drive module (3), the alarm module (203) and the control circuit (5), which controls the anal sphincter to open and close at the appropriate time, replacing the control ability of the nerve center in the human body during defecation.

2. The artificial anal sphincter system based on the urge to defecate as described in claim 1, characterized in that, The sensor includes a first sensor (201) and a second sensor (202); The first sensor (201) and the second sensor (202) are connected to the microcontroller control module (6) through the control circuit (5); The alarm module (203) includes an LED light and a buzzer. When the intestinal contents accumulate to the point where they need to be discharged, the LED light flashes continuously and the buzzer sounds an alarm, together reminding the patient to defecate and serving as a defecation reminder. The screen display module (204) is used to display the values ​​detected by the first sensor (201) and the second sensor (202) as well as the state of intestinal contents discharge, for real-time monitoring of defecation dynamics.

3. The artificial anal sphincter system based on the urge to defecate as described in claim 2, characterized in that, The first sensor (201) is a long strip-shaped thin film flexible pressure sensor. The first sensor (201) is wrapped around the surface of the intestinal tube and is used to detect the pressure value on the surface of the intestinal tube and indirectly detect the amount of intestinal contents in order to determine the time of defecation. The second sensor (202) is a humidity sensor. The two electrodes of the second sensor (202) are made of copper foil and the surface is plated with nickel. The second sensor (202) is used to detect and classify the excreted intestinal contents.

4. The artificial anal sphincter system based on the urge to defecate as described in claim 1, characterized in that, The microcontroller control module (6) is an STM32F103 microcontroller; The drive module (3) includes a driver (301) and a stepper motor (302). The driver (301) is a Yaskawa-CA230 driver, and the stepper motor (302) is a Yaskawa-20HD1401 stepper motor.

5. The artificial anal sphincter system based on the urge to defecate according to claim 1, characterized in that, The execution module (4) includes, from top to bottom, an upper top plate (401), an upper movable plate (403), a lower movable plate (406), an upper clamping plate (407), a lower clamping plate (408), and a lower bottom plate (409); The upper top plate (401) is elliptical, and the upper top plate (401) has four M2 threaded holes and one circular hole in the center to connect with the stepper motor (302); The upper movable plate (401) is elliptical and is fixed between the upper top plate (401) and the lower movable plate (406). The upper clamping plate (407) is connected to the lower end of the lower movable plate (406), and the lower clamping plate (408) is connected to the lower base plate (409). The upper clamping plate (407) and the lower clamping plate (408) are both made of polyetheretherketone (PEEK). The outer sides of the upper clamping plate (407) and the lower clamping plate (408) are wrapped with a medical silicone film.

6. The artificial anal sphincter system based on the urge to defecate as described in claim 5, characterized in that, The execution module (4) further includes a weight pan (402), a first constant force spring (404), and a second constant force spring (405); The weight plate (402) has a first threaded hole in the middle, which is connected to the motor screw of the stepper motor (302). Three second threaded holes are evenly distributed around the first threaded hole. The weight plate is fixed to the upper end of the upper movable plate (403) through the three second threaded holes. One end of the first constant force spring (404) and the second constant force spring (405) are both connected to the lower end of the upper movable plate (403), and the other end is connected to the upper end of the lower movable plate (406). The first constant force spring (404) and the second constant force spring (405) are respectively fixed at both ends between the upper movable plate (403) and the lower movable plate (406). The first constant force spring (404) and the second constant force spring (405) are nickel-titanium springs.

7. The artificial anal sphincter system based on the urge to defecate as described in claim 4, characterized in that, The execution module (4) also includes a left support frame (410) and a right support frame (411); The top plate (401) has three evenly distributed M3 threaded holes on each side for screwing into the left support frame (410) and the right support frame (411); The bottom plate (409) has three M2 threaded holes on each side for screwing into the left support frame (410) and the right support frame (411); The outer sides of the left support frame (410) and the right support frame (411) are generally arc-shaped. The left support frame (410) and the right support frame (411) are also provided with elliptical sliding grooves. The sliding grooves are respectively connected to the protrusions on the upper movable plate (403) and the lower movable plate (406) to realize the up and down opening and closing movement of the execution module (4).

8. The artificial anal sphincter system based on the urge to defecate as described in claim 5, characterized in that, The upper movable plate (403) and the lower movable plate (406) are each provided with two holes. The holes of the upper movable plate (403) and the holes of the lower movable plate (406) are connected by flexible ropes to enhance the fixation between the first constant force spring (404) and the second constant force spring (405).

9. The artificial anal sphincter system based on the urge to defecate according to claim 1, characterized in that, The microcontroller control module (6) is an STM32F103 microcontroller. It uses a development board with STM32F103ZET6 as the main chip. The chip is packaged in LOFP. The microcontroller control module (6) serves as the control unit of the entire system and is used for signal conversion and control.

10. The artificial anal sphincter system based on the urge to defecate according to claim 1, characterized in that, It also includes a power management module (7) for power supply, the power management module (7) including a 24V rechargeable lithium battery with a rated capacity of 2600mAh and a weight of 300g, the power management module (7) is used to supply power to the system.

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