An artificial anal sphincter device with rope drive for constant force clamping

Abstract

The present invention relates to an artificial anal sphincter device with constant-force clamping by rope drive, which includes a drive motor, a non-coplanar wheel, a pair of constant-force elements, a co-planar and opposite-direction wheel and a clamping element. The pair of constant-force elements are respectively a constant-force element A and a constant-force element B. One ends of the constant-force element A and the constant-force element B are respectively connected to the drive motor. The other ends of the constant-force element A and the constant-force element B are respectively wound around the non-coplanar wheel and the co-planar and opposite-direction wheel and then connected to the clamping element. When the drive motor controls one of the constant-force element A and the constant-force element B to tighten, the other one is relaxed. Through the coordinated action of the pair of constant-force elements, the drive motor realizes the opening and closing of the clamping element. By embedding the designed constant-force element in the rope-wheel drive structure, the present invention can always maintain a constant clamping force during the long-term clamping of the intestinal tube, effectively avoiding intestinal tube damage or device failure caused by excessive or too small force on the intestinal tube, and effectively solving the biomechanical compatibility between the artificial anal sphincter and the intestinal tube.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an artificial anal sphincter device with a rope drive for constant force clamping. Background Art

[0002] Fecal incontinence is one of the common diseases in anorectal surgery and is a sociological and hygienic problem. Fecal incontinence refers to the inability to voluntarily control the excretion of liquid or solid, and clinically it is mainly manifested as the inability to voluntarily control defecation caused by the disorder of defecation control ability. Although fecal incontinence is not life-threatening, it brings great physical and mental pain and inconvenience to patients.

[0003] As a common and frequently-occurring disease, fecal incontinence is a complex clinical symptom caused by multiple factors. There are many risk factors for fecal incontinence, including old age, physical weakness, disability, childbirth, rectal radiotherapy, anorectal surgery, and diarrhea. Therefore, the incidence of fecal incontinence increases with age and the decline of mental and physiological states. The causes of fecal incontinence include: (1) congenital physiological structure defects; (2) dysfunction or damage of the brain center and peripheral nervous system that control defecation; (3) dysfunction or damage of perianal muscles such as the anal sphincter and levator ani muscle.

[0004] Currently, the commonly used treatment methods for fecal incontinence at home and abroad include rehabilitative conservative treatment and surgical treatment. Rehabilitative conservative treatment includes intestinal motility treatment, drug-assisted treatment, perianal muscle training, biofeedback treatment, and non-surgical electrical stimulation. Surgical treatment includes sphincter repair, gracilis muscle transplantation, sacral nerve electrical stimulation, injection molding with dilator, colostomy, and artificial anal sphincter.

[0005] Doctors will select relatively appropriate treatment methods according to the specific conditions of patients such as different diseases and causes. However, for severely fecal incontinent patients with congenital, neurological anal incontinence and colorectal cancer, the artificial anal sphincter is an ideal treatment method. The artificial anal sphincter is a surgical treatment method that can effectively treat fecal incontinence, and the devices developed abroad have been clinically applied. The artificial anal sphincter refers to an artificial prosthesis device that can control defecation by simulating the physiological function of the normal external anal sphincter, thereby treating fecal incontinence. In the current research on artificial sphincters, the biomechanical matching problem caused by the long-term morphological changes of the tissues around the implant leading to failure, ischemic necrosis, and tissue atrophy is the key problem in the clinical application of this technology. Summary of the Invention

[0006] Based on the problem of the mismatch between the artificial anal sphincter device and the intestinal tissue mechanics in the prior art, the present invention provides an artificial anal sphincter device with a rope drive for constant force clamping.

[0007] The present invention utilizes the superelastic characteristics of a filamentous shape memory alloy (SMA) material. By embedding a designed constant force device in the transmission structure of the device, it can always maintain a constant clamping force during the long-term clamping of the intestinal tube, effectively avoiding intestinal tube damage or device failure caused by excessive or insufficient force on the intestinal tube, and effectively solving the biomechanical compatibility between the artificial anal sphincter and the intestinal tube.

[0008] The object of the present invention is achieved through the following technical solutions:

[0009] The present invention provides an artificial anal sphincter device with a rope drive type constant force clamping, which includes a driving motor, a skew wheel, a pair of constant force elements, a co-planar and opposite-direction wheel, and a clamping element. The skew wheel is arranged close to the driving motor, and the co-planar and opposite-direction wheel is arranged close to the clamping element. The pair of constant force elements are respectively a constant force element A and a constant force element B. One end of the constant force element A and the constant force element B are respectively connected to the driving motor. The other ends of the constant force element A and the constant force element B are respectively wound around the skew wheel and the co-planar and opposite-direction wheel and then connected to the clamping element. When the driving motor controls one of the constant force element A and the constant force element B to tighten, the other relaxes. The driving motor realizes the opening and closing of the clamping element through the coordinated action of the pair of constant force elements.

[0010] In an embodiment of the present invention, both the constant force element A and the constant force element B include shape memory alloy wires. One end of the shape memory alloy wire is connected to the driving motor, and the other ends of the shape memory alloy wires are respectively wound around the skew wheel and the co-planar and opposite-direction wheel and then connected to the clamping element.

[0011] In an embodiment of the present invention, the clamping element includes an upper clamping plate, a lower clamping plate, and a hinge rotating shaft, and the hinge rotating shaft connects the upper clamping plate and the lower clamping plate.

[0012] In an embodiment of the present invention, one end of the shape memory alloy wire is connected to the driving motor, and the other ends of the shape memory alloy wires are respectively wound around the skew wheel and the co-planar and opposite-direction wheel and then connected to the hinge rotating shaft. The driving motor realizes the open or closed state between the upper clamping plate and the lower clamping plate by tightening or relaxing the shape memory alloy wires of the pair of constant force elements.

[0013] In an embodiment of the present invention, the skew wheel includes a skew A wheel, a skew B wheel arranged in a skew manner, and a skew wheel frame. The skew A wheel and the skew B wheel are installed on the skew wheel frame. The spatial planes where the skew A wheel and the skew B wheel are located are perpendicular to each other, and are used to change the transmission direction. Two skew A wheels and two skew B wheels are respectively provided, and are respectively used for the shape memory alloy wires of the constant force element A and the constant force element B to pass through.

[0014] In an embodiment of the present invention, the co-planar and counter-rotating wheels include a pair of co-planar and counter-rotating Wheel A, a pair of co-planar and counter-rotating Wheel B, and a co-planar and counter-rotating wheel frame. The pair of co-planar and counter-rotating Wheel A and the pair of co-planar and counter-rotating Wheel B are installed on the co-planar and counter-rotating wheel frame. The constant force element A and the constant force element B are wound around the pair of co-planar and counter-rotating Wheel A and the pair of co-planar and counter-rotating Wheel B in a non-coplanar manner. One of the co-planar and counter-rotating Wheel A and one of the co-planar and counter-rotating Wheel B form a group for the shape memory alloy wire of the constant force element A or the constant force element B to pass through.

[0015] In an embodiment of the present invention, one end of the shape memory alloy wire is connected to the driving motor. After the other end of the shape memory alloy wire is wound around the non-coplanar Wheel A and the non-coplanar Wheel B of the non-coplanar wheels respectively, and then wound around one of the co-planar and counter-rotating Wheel A and one of the co-planar and counter-rotating Wheel B of the co-planar and counter-rotating wheels, it is connected to the hinge rotating shaft.

[0016] In an embodiment of the present invention, a carbon fiber tube is sleeved outside the shape memory alloy wire.

[0017] In an embodiment of the present invention, the connection mode between the shape memory alloy wire and the driving motor is as follows: after the shape memory alloy wire is connected to the driving motor, the shape memory alloy wire is wound around the bolt and locked by the nut.

[0018] In an embodiment of the present invention, the connection mode between the shape memory alloy wire and the hinge rotating shaft is as follows: after the shape memory alloy wire is connected to the hinge rotating shaft, the shape memory alloy wire is wound around the bolt and locked by the nut. In an embodiment of the present invention, the constant force element A includes two pairs of nuts, a shape memory alloy wire, and a pair of bolts. The shape memory alloy wire is wound around the bolt and locked by the nuts on both sides.

[0019] In an embodiment of the present invention, the clamping element further includes a pair of medical silicone pads. The side surface of the medical silicone pad is an arc surface, which is convenient for fitting with the intestinal tube. The other side surface of the medical silicone pad is fixed on the upper clamping plate and the lower clamping plate.

[0020] In an embodiment of the present invention, a flexible stopper is further provided in the clamping element, and the flexible stopper is located between the upper clamping plate and the lower clamping plate.

[0021] In an embodiment of the present invention, the clamping element is connected to the co-planar and counter-rotating wheel frame. At the same time, the connection mode between the clamping element and the co-planar and counter-rotating wheel frame does not affect the rotation of the hinge rotating shaft in the clamping element, that is, it does not affect the angle adjustment between the upper clamping plate and the lower clamping plate.

[0022] In an embodiment of the present invention, the driving motor is a motor capable of forward and reverse rotation.

[0023] When the present invention is in use, the driving motor controls one constant-force element A to relax and the other constant-force element B to contract, and the clamping end clamps the intestinal tube to close it; if it is required that the clamping end opens the intestinal tube, the driving motor controls the constant-force element A to contract and the constant-force element B to relax. Through the coordinated action of a pair of constant-force elements, the opening and closing of the device, that is, the clamping and relaxation of the intestinal tube, can be achieved. Since the shape memory alloy wire has a constant-force characteristic, under this displacement change, the output force of the clamping end is a constant force. The present invention is driven by a motor, and the constant-force element is transmitted by a rope pulley to control the clamping element of the sphincter, realizing the opening and closing of the artificial sphincter. The present invention realizes the constant-force clamping of the intestinal tissue by the clamping mechanism by designing a constant-force mechanism embedded with shape memory alloy wires, effectively solving problems such as intestinal tissue ischemia and necrosis caused by the mechanical mismatch between the sphincter device and the intestinal tissue.

[0024] The constant-force element designed by the present invention realizes the constant-force clamping of the intestinal tube by embedding the shape memory alloy wire in the rope pulley transmission. Compared with the existing artificial anal sphincter technology, it has the following remarkable advantages:

[0025] (1) Adopting rope transmission, the structure is light, the transmission is relatively more flexible, and it is more conducive to realizing the swing and large-degree-of-freedom movement of the clamping element.

[0026] (2) The structure has a constant-force characteristic. During the process of clamping the intestinal tube, a constant clamping force is always applied to the intestinal tube, playing a role in protecting the intestinal tube, avoiding overpressure damage, realizing the long-term mechanical matching between the implanted device and the surrounding biological tissue, and thus improving the biocompatibility of the artificial sphincter. Brief Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the artificial anal sphincter device with constant-force clamping by rope transmission in Embodiment 1 of the present invention;

[0028] Figure 2 It is a schematic structural diagram of the different-plane wheel in the artificial anal sphincter device with constant-force clamping by rope transmission in Embodiment 1 of the present invention;

[0029] Figure 3 It is a schematic structural diagram of the constant-force element in the artificial anal sphincter device with constant-force clamping by rope transmission in Embodiment 1 of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the same-plane different-direction wheel in the artificial anal sphincter device with constant-force clamping by rope transmission in Embodiment 1 of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the clamping element in the artificial anal sphincter device with constant-force clamping by rope transmission in Embodiment 1 of the present invention;

[0032] Figure 6Schematic diagrams of the open and closed states of the cable-driven constant-force clamping artificial anal sphincter device in Embodiment 1 of the present invention.

[0033] As shown in the figure by the reference numerals:

[0034] 1 - drive motor

[0035] 2 - non-coplanar wheels, 201 - non-coplanar wheel A, 202 - non-coplanar wheel B, 203 - non-coplanar wheel frame

[0036] 3 - constant-force element A, 301 - nut, 302 - shape memory alloy wire, 303 - bolt

[0037] 4 - co-planar and counter-rotating wheels, 401 - co-planar and counter-rotating wheel A, 402 - co-planar and counter-rotating wheel B, 403 - co-planar and counter-rotating wheel frame

[0038] 5 - clamping element, 501 - upper clamping plate, 502 - lower clamping plate, 503 - hinge rotating shaft, 504 - medical silicone pad

[0039] 6 - flexible stopper

[0040] 7 - constant-force element B Detailed implementation mode

[0041] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Embodiment

[0043] As Figure 1 、 2 shown in Figures 3, 4, 5, 6, this embodiment provides a cable-driven constant-force clamping artificial anal sphincter device, including a drive motor 1, non-coplanar wheels 2, a pair of constant-force elements, co-planar and counter-rotating wheels 4 and a clamping element 5.

[0044] The non-coplanar wheels 2 are arranged close to the drive motor 1, the co-planar and counter-rotating wheels 4 are arranged close to the clamping element 5, and the pair of constant-force elements are respectively the constant-force element A 3 and the constant-force element B 7.

[0045] One ends of the constant-force element A 3 and the constant-force element B 7 are respectively connected to the drive motor 1, and the other ends of the constant-force element A 3 and the constant-force element B 7 are respectively wound around the non-coplanar wheels 2 and the co-planar and counter-rotating wheels 4 and then connected to the clamping element 5.

[0046] When the drive motor 1 controls one of the constant-force element A 3 and the constant-force element B 7 to tighten, the other is relaxed. The drive motor 1 realizes the opening and closing of the clamping element 5 through the coordinated action of the pair of constant-force elements.

[0047] In this embodiment, both the constant force element A3 and the constant force element B7 include a shape memory alloy wire 302. One end of the shape memory alloy wire 302 is connected to the driving motor 1, and the other end of the shape memory alloy wire 302 is respectively wound around the non-coplanar wheel 2 and the co-planar and counter-rotating wheel 4 and then connected to the clamping element 5.

[0048] In this embodiment, as Figure 1 , 5 shown, the clamping element 5 includes an upper clamping plate 501, a lower clamping plate 502 and a hinge rotating shaft 503. The hinge rotating shaft 503 connects the upper clamping plate 501 and the lower clamping plate 502.

[0049] In this embodiment, one end of the shape memory alloy wire 302 is connected to the driving motor 1, and the other end of the shape memory alloy wire 302 is respectively wound around the non-coplanar wheel 2 and the co-planar and counter-rotating wheel 4 and then connected to the hinge rotating shaft 503. The driving motor 1 realizes the open or closed state between the upper clamping plate 501 and the lower clamping plate 502 by tightening or loosening the shape memory alloy wires 302 of a pair of constant force elements.

[0050] In this embodiment, as Figure 1 , 2 shown, the non-coplanar wheel 2 includes a non-coplanar A wheel 201, a non-coplanar B wheel 202 and a non-coplanar wheel frame 203 which are non-coplanarly arranged. The non-coplanar A wheel 201 and the non-coplanar B wheel 202 are installed on the non-coplanar wheel frame 203. The spatial planes where the non-coplanar A wheel 201 and the non-coplanar B wheel 202 are located are perpendicular to each other and are used to change the transmission direction. Two non-coplanar A wheels 201 and two non-coplanar B wheels 202 are respectively provided for the shape memory alloy wires 302 of the constant force element A3 and the constant force element B7 to pass through.

[0051] In this embodiment, as Figure 1 , 4 shown, the co-planar and counter-rotating wheel 4 includes a pair of co-planar and counter-rotating A wheels 401, a pair of co-planar and counter-rotating B wheels 402 and a co-planar and counter-rotating wheel frame 403. The pair of co-planar and counter-rotating A wheels 401 and the pair of co-planar and counter-rotating B wheels 402 are installed on the co-planar and counter-rotating wheel frame 403. The constant force element A3 and the constant force element B7 are wound around the pair of co-planar and counter-rotating A wheels 401 and the pair of co-planar and counter-rotating B wheels 402 in a non-coplanar manner. One co-planar and counter-rotating A wheel 401 and one co-planar and counter-rotating B wheel 402 are taken as a group for the shape memory alloy wire 302 of the constant force element A3 or the constant force element B7 to pass through.

[0052] In this embodiment, one end of the shape memory alloy wire 302 is connected to the drive motor 1. After the other end of the shape memory alloy wire 302 is wound around the different-plane A wheel 201 and the different-plane B wheel 202 of the different-plane wheel 2 respectively, and then wound around one of the same-plane different-direction A wheels 401 and one of the same-plane different-direction B wheels 402 of the same-plane different-direction wheel 4, it is connected to the hinge rotating shaft 503.

[0053] In this embodiment, a carbon fiber tube is sleeved outside the shape memory alloy wire 302.

[0054] In this embodiment, the connection mode between the shape memory alloy wire 302 and the drive motor 1 is as follows: after the shape memory alloy wire 302 is connected to the drive motor 1, the shape memory alloy wire 302 is wound around the bolt 303 and locked by the nut 301. The connection mode between the shape memory alloy wire 302 and the hinge rotating shaft 503 is as follows: after the shape memory alloy wire 302 is connected to the hinge rotating shaft 503, the shape memory alloy wire 302 is wound around the bolt 303 and locked by the nut 301. That is, as Figure 1 , 3 shown, the constant force element A3 includes two pairs of nuts 301, a shape memory alloy wire 302 and a pair of bolts 303. The shape memory alloy wire 302 is wound around the bolt 303 and locked by the nuts 301 on both sides.

[0055] In this embodiment, as Figure 1 , 5 shown, the clamping element 5 further includes a pair of medical silicone pads 504. The side surface of the medical silicone pad 504 is an arc surface, which is convenient for fitting with the intestinal tube. The other side surface of the medical silicone pad 504 is fixed on the upper clamping plate 501 and the lower clamping plate 502.

[0056] In this embodiment, referring to Figure 1 , a flexible stopper 6 is further arranged in the clamping element 5, and the flexible stopper 6 is located between the upper clamping plate 501 and the lower clamping plate 502.

[0057] In this embodiment, referring to Figure 6 , the clamping element 5 is connected to the same-plane different-direction wheel frame 403. At the same time, the connection mode between the clamping element 5 and the same-plane different-direction wheel frame 403 does not affect the rotation of the hinge rotating shaft 503 in the clamping element 5, that is, it does not affect the angle adjustment between the upper clamping plate 501 and the lower clamping plate 502.

[0058] In this embodiment, the drive motor 1 is a motor capable of positive and negative rotation.

[0059] As Figure 6 shown, when the device works, it has an open state and a closed state. Figure 6 a is a schematic diagram of the clamping element when the device is in the open state. Figure 6Schematic diagram of the clamping element when the device is in the closed state.

[0060] In the present invention, orientation terms such as "upper" and "lower" are described according to the attached drawings, rather than the actual orientation of the device in use.

[0061] The working process of the present invention is specifically as follows: After a pair of constant force elements are wound around the driving motor 1, they enter the carbon fiber tube after passing through the non-coplanar wheel A 201 and the non-coplanar wheel B 202. During this process, the winding direction of the constant force element A 3 changes by 90°; then the constant force elements pass through a pair of coplanar and oppositely rotating wheels A 401 and a pair of coplanar and oppositely rotating wheels B 402 respectively, and are wound non-coplanarly, and then connected to the hinge shaft 503, so as to control the yaw movement of the clamping element 5 and realize the clamping function of the intestinal tube. The device enters the closed state, as shown in Figure 6 Figure b.

[0062] It can be seen from the winding method of the constant force elements that if it is required to close the intestinal tube at the clamping end, the driving motor 1 controls the constant force element B to tighten and the constant force element A to relax; if it is required to open the intestinal tube at the clamping end, the driving motor 1 controls the constant force element A to tighten and the constant force element B to relax. Through the coordinated action of a pair of constant force elements, the opening and closing of the device, that is, the clamping and relaxation of the intestinal tube, can be realized, as shown in Figure 6 Figure. Due to the constant force characteristic of the shape memory alloy wire, under this displacement change, the output force at the clamping end is a constant force.

[0063] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A rope-driven constant-force clamping artificial anal sphincter device, characterized in that, It includes a drive motor (1), a skew wheel (2), a pair of constant force elements, a co-planar and counter-rotating wheel (4) and a clamping element (5). The skew wheel (2) is arranged close to the drive motor (1), and the co-planar and counter-rotating wheel (4) is arranged close to the clamping element (5). The pair of constant force elements are respectively a constant force element A (3) and a constant force element B (7). One ends of the constant force element A (3) and the constant force element B (7) are respectively connected to the drive motor (1). The other ends of the constant force element A (3) and the constant force element B (7) are respectively wound around the skew wheel (2) and the co-planar and counter-rotating wheel (4) and then connected to the clamping element (5). When the drive motor (1) controls one of the constant force element A (3) and the constant force element B (7) to tighten, the other one is relaxed. The drive motor (1) realizes the opening and closing of the clamping element (5) through the cooperative action of a pair of constant force elements; Both the constant force element A (3) and the constant force element B (7) include shape memory alloy wires (302). One end of the shape memory alloy wire (302) is connected to the drive motor (1). The other end of the shape memory alloy wire (302) is respectively wound around the skew wheel (2) and the co-planar and counter-rotating wheel (4) and then connected to the clamping element (5); The clamping element (5) includes an upper clamping plate (501), a lower clamping plate (502) and a hinge rotating shaft (503). The hinge rotating shaft (503) connects the upper clamping plate (501) and the lower clamping plate (502); One end of the shape memory alloy wire (302) is connected to the drive motor (1). The other end of the shape memory alloy wire (302) is respectively wound around the skew wheel (2) and the co-planar and counter-rotating wheel (4) and then connected to the hinge rotating shaft (503). The drive motor (1) realizes the open or closed state between the upper clamping plate (501) and the lower clamping plate (502) by tightening or relaxing the shape memory alloy wires (302) of a pair of constant force elements.

2. The artificial anal sphincter device with rope drive constant force clamping according to claim 1, characterized in that The skew wheel (2) includes a skew A wheel (201), a skew B wheel (202) arranged in a skew manner and a skew wheel frame (203). The skew A wheel (201) and the skew B wheel (202) are installed on the skew wheel frame (203). The spatial planes where the skew A wheel (201) and the skew B wheel (202) are located are perpendicular to each other and are used to change the transmission direction. Two skew A wheels (201) and two skew B wheels (202) are respectively arranged and are respectively used for the shape memory alloy wires (302) of the constant force element A (3) and the constant force element B (7) to pass through.

3. The artificial anal sphincter device with constant force clamping by rope drive according to claim 2, wherein The co-planar and counter-rotating wheels (4) include a pair of co-planar and counter-rotating A-type wheels (401), a pair of co-planar and counter-rotating B-type wheels (402), and a co-planar and counter-rotating wheel frame (403). The pair of co-planar and counter-rotating A-type wheels (401) and the pair of co-planar and counter-rotating B-type wheels (402) are installed on the co-planar and counter-rotating wheel frame (403). The constant force element A (3) and the constant force element B (7) are wound around the pair of co-planar and counter-rotating A-type wheels (401) and the pair of co-planar and counter-rotating B-type wheels (402) in a non-coplanar manner. One of the co-planar and counter-rotating A-type wheels (401) and one of the co-planar and counter-rotating B-type wheels (402) form a group through which the shape memory alloy wire (302) of the constant force element A (3) or the constant force element B (7) passes.

4. The artificial anal sphincter device with constant force clamping by rope drive according to claim 3, characterized in that, One end of the shape memory alloy wire (302) is connected to the drive motor (1). After the other end of the shape memory alloy wire (302) is wound around the non-coplanar A-type wheel (201) and the non-coplanar B-type wheel (202) of the non-coplanar wheel (2), it is then wound around one of the co-planar and counter-rotating A-type wheels (401) and one of the co-planar and counter-rotating B-type wheels (402) of the co-planar and counter-rotating wheel (4), and then connected to the hinge rotating shaft (503).

5. The artificial anal sphincter device with constant force clamping by rope drive according to claim 4, characterized in that, The connection mode between the shape memory alloy wire (302) and the drive motor (1) is as follows: after the shape memory alloy wire (302) is connected to the drive motor (1), the shape memory alloy wire (302) is wound around the bolt (303) and locked by the nut (301). The connection mode between the shape memory alloy wire (302) and the hinge rotating shaft (503) is as follows: after the shape memory alloy wire (302) is connected to the hinge rotating shaft (503), the shape memory alloy wire (302) is wound around the bolt (303) and locked by the nut (301).

6. The artificial anal sphincter device with rope drive constant force clamping according to claim 4, characterized in that The clamping element (5) is connected to the co-planar and counter-rotating wheel frame (403). At the same time, the connection mode between the clamping element (5) and the co-planar and counter-rotating wheel frame (403) does not affect the rotation of the hinge rotating shaft (503) in the clamping element (5), that is, it does not affect the angle adjustment between the upper clamping plate (501) and the lower clamping plate (502).

7. The artificial anal sphincter device with constant force clamping by rope transmission according to claim 1, characterized in that, A carbon fiber tube is sleeved outside the shape memory alloy wire (302).

8. The artificial anal sphincter device with constant force clamping by rope drive according to claim 1, characterized in that, The clamping element (5) further includes a pair of medical silicone pads (504). The side surface of the medical silicone pad (504) is an arc surface, which is convenient for fitting with the intestinal tube. The other side surface of the medical silicone pad (504) is fixed on the upper clamping plate (501) and the lower clamping plate (502).

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