A urethral valve driven by SMA wire powered by magnetic induction heating

Abstract

The present invention relates to a urethral valve driven by an SMA wire powered by magnetic induction heating. The valve comprises a valve body located within the body and an alternating magnetic field generating device located outside the body for generating an alternating magnetic field. The valve body comprises a valve core, a clamping portion, and a driving portion. The valve core and the driving portion are both connected to the clamping portion. The driving portion comprises a driving sac, a connector, an SMA wire, and a magnetic fluid. The driving sac and the connector form a sealed cavity. The magnetic fluid and the SMA wire are both located within the inner cavity of the sealed cavity. The SMA wire is connected to the connector, which is also connected to the clamping portion. The driving sac is an elastic film. When the magnetic fluid is in the alternating magnetic field generated by the alternating magnetic field generating device, the SMA wire is initially bent and straightened after being heated. This solution utilizes the heating of the magnetic fluid in the alternating magnetic field to control the shape change of the SMA wire to control the opening and closing of the urethra. The driving method has few energy conversion steps, high efficiency, and a simple urethral valve structure.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a urethral valve driven by a magnetic induction heating energy supply SMA wire. Background Art

[0002] Clinically, urinary incontinence refers to the involuntary loss of urine due to bladder sphincter damage or neurological dysfunction, resulting in a loss of urinary control. It is a common and frequent condition that can occur in all ages and genders, but is particularly prevalent in women and the elderly. It can lead to complications such as perineal and sacrococcygeal dermatitis and pressure ulcers, severely impacting patients' quality of life and physical and mental health.

[0003] There are many factors that cause urinary incontinence, the most important of which is urethral sphincter dysfunction or trauma. To address the problem of urinary incontinence caused by urethral sphincter dysfunction, current clinical treatments are mainly conservative treatment and surgical treatment. Among them, conservative treatments include hormone replacement medication, exercise therapy that alleviates or corrects symptoms by strengthening pelvic floor muscle tension, and traditional Chinese medicine treatments that improve bladder function through acupuncture. However, the above therapies are only suitable for patients with mild urinary incontinence, and are not effective for moderate and severe patients, who must undergo surgical treatment. Surgical treatment is easily limited by differences caused by various reasons such as the patient's age and gender, and is prone to complications such as dysuria, bladder perforation, and vascular damage. The long-term efficacy is still unclear.

[0004] Therefore, it is of great clinical significance to adopt a urethral valve device that can autonomously control the opening and closing of the urethra to solve the problem of severe urinary incontinence caused by urethral sphincter dysfunction. For example, a wirelessly powered SMA-driven urethral valve with application number 201611131207.8 is driven by an SMA spring, which is sensitive and can achieve the purpose of autonomous urethra control. However, it requires the arrangement of an energy receiving coil in the body, which makes surgical installation difficult and the process complicated. Once the coil falls off in the body, the urethral valve fails due to the inability to obtain energy, and another surgery is required to reset it. Its energy conversion steps are "magnetic energy-electrical energy-thermal energy", which has many conversion steps and low efficiency. Summary of the Invention

[0005] To address the challenges of prior art solutions, such as urethral valves requiring an internal energy receiving coil, resulting in difficult and complex surgical installation, multiple energy conversion steps, and low efficiency, this invention provides a magnetically inductively heated SMA wire-driven urethral valve. This solution eliminates the need for an implanted receiving coil and directly converts magnetic energy into thermal energy, minimizing the number of energy conversion steps.

[0006] The technical solution adopted by the present invention is: a urethral valve driven by an SMA wire powered by magnetic induction heating, comprising a valve body located inside the patient's body and an alternating magnetic field generating device located outside the patient's body for generating an alternating magnetic field, the valve body comprising a valve core, a clamping part and a driving part, the valve core and the driving part are both connected to the clamping part, the driving part comprises a driving capsule, a connecting part, an SMA wire and a magnetic fluid, the driving capsule and the connecting part form a sealed cavity, the magnetic fluid and the SMA wire are both located in the inner cavity of the sealed cavity, the SMA wire is connected to the connecting part, and the connecting part is also connected to the clamping part, the driving capsule is an elastic film, the magnetic fluid generates heat when in the alternating magnetic field generated by the alternating magnetic field generating device, the SMA wire is initially in a bent state, and straightens after being heated.

[0007] SMA wire is a shape memory alloy with a two-way memory effect: its memory shape at low temperatures is a curved shape, and its memory shape at high temperatures is a straight shape. Magnetic fluids undergo a relaxation effect in an alternating magnetic field, generating heat and causing the temperature to rise. Heat generation in magnetic fluids occurs primarily through Brownian and Neel relaxation. Neel relaxation occurs when the magnetic moment of magnetic solid particles in an alternating magnetic field overcomes the anisotropic energy barrier due to thermal disturbances. Brownian relaxation occurs when magnetic particles, when subjected to an alternating magnetic field, rotate as a whole within a carrier fluid.

[0008] During the patient's urination phase, the alternating magnetic field generator generates an alternating magnetic field and is brought close to the patient's body. The handheld alternating magnetic field generator is placed on the patient's abdomen. The magnetic fluid undergoes a relaxation effect under the alternating magnetic field and begins to generate heat. When the temperature of the magnetic fluid rises to a temperature sufficient for the SMA wire to deform, the SMA wire in the magnetic fluid at this temperature changes from being bent to being straight. The elongated SMA wire drives the connector to deform the drive capsule, increasing the internal space of the clamping portion and the internal space of the valve core. This reduces the clamping pressure on the urethra, causing the urethra to return to its cylindrical shape and become a passageway. Urine is discharged from the urethra under the action of bladder pressure. After the patient finishes urinating, the alternating magnetic field generator stops generating the magnetic field, and the temperature of the magnetic fluid drops. When the temperature of the magnetic fluid and the SMA wire drops to the critical value of the SMA wire, the SMA wire returns to a bent state, the drive capsule loses its driving force and returns to its deformation, the internal space of the clamping portion decreases, driving the internal space of the valve core to decrease, clamping the urethra closed, preventing urine from flowing out, and the bladder re-enters the urine storage phase.

[0009] This solution uses the relaxation effect of magnetic fluid under an alternating magnetic field to generate heat to control the shape change of the SMA wire, thereby controlling the opening and closing of the urethra. This driving method has fewer energy conversion steps, high efficiency and reliable driving. It is not necessary to arrange electronic components and circuits in the body to provide energy for the movement of the SMA components, which greatly simplifies the structure of the urethral valve. When installing the implanted device, there is no need to perform a surgical incision in the urethra, which does not cause muscle tissue wounds and infections, reducing the difficulty of surgical installation. The components implanted in the body are non-contact with urine and will not cause urinary tract infections and complications. During use, there is no need to leave unclosed wounds in the human body to prevent secondary infection. The use of an external alternating magnetic field generator to control urination is simple to operate and can avoid displacement of the valve body in the body due to improper self-operation by the patient.

[0010] Preferably, the clamping portion includes a first clamping portion and a second clamping portion, the connecting member includes a first connecting member and a second connecting member, the first connecting member and the second connecting member are respectively connected to the first clamping portion and the second clamping portion, the valve body includes two driving portions, the two driving portions are respectively connected to the two ends of the first clamping portion and the second clamping portion so that the two driving portions and the first clamping portion and the second clamping portion form a closed loop, and the valve core is located in the inner cavity of the closed loop. The opposite sides of the valve core are fixedly connected to the first clamping portion and the second clamping portion respectively. The clamping portion is driven by two driving portions to increase the driving force, and compared with the piston-cylinder drive structure, the drive structure of this clamping portion can avoid the phenomenon of the valve core being stuck, and is more suitable for the working environment in the abdominal cavity. The opposite sides of the valve core are fixedly connected to the first clamping portion and the second clamping portion respectively, which increases the connection strength between the valve core and the clamping portion, and makes the positioning of the valve core in the closed loop formed by the driving portion and the clamping portion more accurate.

[0011] Preferably, the ends of the sidewalls of the actuating capsule are connected to the sidewalls of the first and second connectors, respectively; the ends of the SMA wire are connected to the end surfaces of the first and second connectors, respectively; and the other end surfaces of the first and second connectors are connected to the first and second clamping portions, respectively. The connection of the ends of the actuating capsule to the sidewalls of the connectors increases the contact area between the actuating capsule and the connectors, compared to connection of the end surfaces of the actuating capsule to the connectors, resulting in a more stable connection.

[0012] Preferably, the SMA wire is in a bent state below 42°C, and changes from the bent state to a straight state between 42°C and 50°C. The SMA wire includes a first SMA wire and a second SMA wire. The first SMA wire is located on the side of the first connector away from the valve core; the second SMA wire is located on the side of the first connector close to the valve core. When the SMA wire bends, the first SMA wire bends toward the second SMA wire, and the second SMA wire bends toward the first SMA wire. Under normal conditions, the highest temperature in the human body is 37°C. The SMA wire is in a bent state below 42°C to maintain the bent state in the human body. The SMA wire changes from a bent state to a straight state between 42°C and 50°C. At 42°C, the SMA wire begins to deform and straighten. This temperature is different from the temperature in the human body, preventing the SMA wire from deforming due to the patient's fever-induced increase in body temperature, thereby ensuring the accuracy of urethral valve control. Two SMA wires are installed within the drive unit, increasing the driving force on the clamping unit when the SMA wires deform as the magnetic fluid heats up, improving the driving effect. The SMA wires cross when bent, reducing the space occupied by the bent wires and preventing them from contacting the drive capsule and causing deformation.

[0013] Preferably, the clamping part is made of non-metallic material, the connecting piece is made of non-metallic material, the valve core is made of silicone rubber, and the driving capsule is made of rubber. Since metal materials have a shielding effect on magnetic fields, they will weaken the magnetic field strength generated by the alternating magnetic field generator, resulting in a decrease in the heating rate of the magnetic fluid or an inability to heat up. Therefore, the clamping part and the connecting piece are made of non-metallic materials, and the clamping part and the connecting piece can be made of ceramic or plastic materials. The valve core is made of silicone rubber, which has excellent biocompatibility and can simulate the shape, contraction and relaxation mode of the external urethral sphincter, effectively controlling the opening and closing of the urethra. When the urethra is closed, the inner wall of the valve core fits the outer wall of the urethra, so that the clamping pressure on the outer wall of the urethra is uniform, avoiding mechanical damage to the organ and tissue necrosis caused by poor blood circulation. The driving capsule is a layer of elastic rubber membrane that is retractable and can cooperate with the SMA wire to produce corresponding contraction and extension actions during the bending and straightening deformation of the SMA wire.

[0014] Preferably, the alternating magnetic field generating device includes an alternating current generator and a coil, the alternating current generator and the coil being electrically connected. The alternating current generator is configured to generate an alternating current, and the coil is configured to generate an alternating magnetic field when the alternating current flows through it. The alternating magnetic field generating device is located outside the patient's body. When in operation, the alternating current generator provides a sinusoidal alternating voltage source. When connected to the coil, it generates a current within the coil, and the coil simultaneously generates an alternating magnetic field, providing a magnetic field environment for heating the magnetic fluid within the patient's body.

[0015] Compared with existing technologies, the present invention offers the following advantages: It utilizes the heat generated by magnetic fluid in an alternating magnetic field to control the shape change of an SMA wire to control urethral opening and closing. This driving method requires fewer energy conversion steps, resulting in high efficiency and a simple urethral valve structure. The implant does not require a urethral puncture, reducing the surgical installation process and leaving the patient with an open wound, thus preventing secondary infection. Urination is controlled by an external alternating magnetic field generator, making it easy to operate.

[0016] The clamping section is driven by two actuators, increasing driving force. The valve core is fixedly connected to the first and second clamping sections, strengthening the connection between the two. This allows for more precise positioning of the valve core within the closed loop formed by the actuator and clamping sections. The clamping section and connectors are constructed of non-metallic materials to prevent shielding of magnetic fields.

[0017] The SMA wire straightens from a bent state between 42°C and 50°C, a temperature difference from the human body's internal temperature. This prevents the SMA wire from deforming due to a fever, ensuring accurate urethral valve control. Two SMA wires are incorporated into the actuator, providing greater driving force on the clamping unit and improving the driving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a urethral valve driven by a magnetic induction heating power supply SMA wire according to the present invention;

[0019] Figure 2 This is a schematic diagram of the valve body structure of a urethral valve driven by an SMA wire powered by magnetic induction heating according to the present invention, in which the SMA wire is in an extended state;

[0020] Figure 3 This is a schematic diagram of the valve body structure of a urethral valve driven by an SMA wire powered by magnetic induction heating according to the present invention, in which the SMA wire is in a bent state;

[0021] Figure 4 This is a schematic structural diagram of a driving portion of a urethral valve driven by a magnetic induction heating SMA wire according to the present invention;

[0022] Figure 5 It is a structural schematic diagram of an alternating magnetic field generating device of a urethral valve driven by a magnetic induction heating energy SMA wire according to the present invention. DETAILED DESCRIPTION

[0023] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some parts in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0024] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0026] Example 1

[0027] like Figure 1 The figure shows an embodiment 1 of a urethral valve driven by an SMA wire powered by magnetic induction heating, comprising a valve body located inside the patient's body and an alternating magnetic field generating device 7 located outside the patient's body for generating an alternating magnetic field. The valve body comprises a valve core 1, a clamping portion 2 and a driving portion. The valve core 1 and the driving portion are both connected to the clamping portion 2. The driving portion comprises a driving capsule 3, a connector 4, an SMA wire 5 and a magnetic fluid 6. The driving capsule 3 and the connector 4 form a sealed cavity. The magnetic fluid 6 and the SMA wire 5 are both located in the inner cavity of the sealed cavity. The SMA wire 5 is connected to the connector 4, and the connector 4 is also connected to the clamping portion 2. The driving capsule 3 is an elastic film. The magnetic fluid 6 generates heat when in the alternating magnetic field generated by the alternating magnetic field generating device 7. The SMA wire 5 is initially in a bent state and straightens after being heated.

[0028] The working principle or working process of this embodiment is as follows: The SMA wire 5 is a shape memory alloy with a two-way memory effect, that is, the memory shape at low temperatures is a curved shape, and the memory shape at high temperatures is a straight shape. The magnetic fluid 6 undergoes a relaxation effect in the alternating magnetic field, generating heat and increasing the temperature. For magnetic fluids, heat is mainly generated through Brownian relaxation and Neel relaxation. Neel relaxation is caused by the rotation of the magnetic moment of magnetic solid particles in the alternating magnetic field due to thermal disturbance overcoming the anisotropy barrier; Brownian relaxation is caused by the rotation of magnetic solid particles in the carrier fluid when the magnetic particles are subjected to the alternating magnetic field.

[0029] During the urination phase, the alternating magnetic field generator 7 generates an alternating magnetic field and is brought close to the patient's body. The handheld alternating magnetic field generator 7 is placed on the patient's abdomen. Under the alternating magnetic field, the magnetic fluid 6 undergoes a relaxation effect and begins to generate heat. After the temperature of the magnetic fluid 6 rises to a point where the SMA wire 5 is deformed, the SMA wire 5 changes from being bent to being straightened within the magnetic fluid 6 at this temperature. The elongated SMA wire 5 drives the connector 4 to drive the drive capsule 3 to deform, increasing the internal space of the clamping portion 2 and, in turn, the internal space of the valve core 1. This reduces the clamping pressure on the urethra, causing the urethra to return to its cylindrical shape and become a passageway. Urine is then discharged from the urethra under the action of bladder pressure. After the patient finishes urinating, the alternating magnetic field generator 7 stops generating the magnetic field, and the temperature of the magnetic fluid 6 decreases. Once the temperature of the magnetic fluid 6 and the SMA wire 5 drops to a critical value for the SMA wire 5, the SMA wire 5 returns to its bent state. The drive capsule 3 loses its driving force and recovers its deformation. The internal space of the clamping portion 2 decreases, driving the internal space of the valve core 1 to decrease, clamping the urethra closed and preventing urine from flowing out. The bladder then re-enters the urine storage phase.

[0030] Beneficial effects of this embodiment: This solution utilizes the relaxation effect of the magnetic fluid 6 under the alternating magnetic field to generate heat to control the shape change of the SMA wire 5, so as to control the opening and closing of the urethra. This driving method has fewer energy conversion steps, high efficiency and reliable driving. It is not necessary to arrange electronic components and circuits in the body to provide energy for the movement of the SMA element, which greatly simplifies the structure of the urethral valve. When installing the implanted device, there is no need to perform a surgical opening on the urethra, and no muscle tissue wounds and infections will be caused. The components implanted in the body are non-contact with urine and will not cause urinary tract infections and complications. During use, there is no need to leave unclosed wounds in the human body to prevent secondary infection. The use of an external alternating magnetic field generating device 7 to control urination is simple to operate and can avoid displacement of the valve body in the body caused by improper autonomous operation of the patient.

[0031] Example 2

[0032] Example 2 of a urethral valve driven by a magnetic induction heating power supply SMA wire, as shown in FIG. Figure 2-Figure 4 As shown, based on Example 1, the structure of the valve body is further limited.

[0033] Specifically, the clamping portion 2 includes a first clamping portion 201 and a second clamping portion 202, and the connecting member 4 includes a first connecting member 401 and a second connecting member 402, which are respectively connected to the first clamping portion 201 and the second clamping portion 202. The valve body includes two driving parts, which are respectively connected to the ends of the first clamping portion 201 and the second clamping portion 202 to form a closed circuit. The valve core 1 is located within the closed circuit. Opposite sides of the valve core 1 are fixedly connected to the first clamping portion 201 and the second clamping portion 202.

[0034] Specifically, the two ends of the side wall of the driving capsule 3 are respectively connected to the side walls of the first connecting member 401 and the second connecting member 402, the two ends of the SMA wire 5 are respectively connected to the end faces of the first connecting member 401 and the second connecting member 402, and the other end face of the first connecting member 401 and the other end face of the second connecting member 402 are respectively connected to the first clamping portion 201 and the second clamping portion 201.

[0035] Specifically, the SMA wire 5 is in a bent state below 42°C and becomes straight between 42°C and 50°C. The SMA wire 5 includes a first SMA wire 501 and a second SMA wire 502. The first SMA wire 501 is located on the side of the first connector 401 away from the valve core 1; the second SMA wire 502 is located on the side of the first connector 401 closer to the valve core 1. When the SMA wire 5 bends, the first SMA wire 501 bends toward the second SMA wire 502, and the second SMA wire 502 bends toward the first SMA wire 501.

[0036] Specifically, the clamping portion 2 is made of ceramic material, the connecting piece 4 is made of plastic material, the valve core 1 is made of silicone rubber material, and the driving capsule 3 is made of rubber material.

[0037] The beneficial effects of this embodiment are as follows: the clamping portion 2 is driven by two drive units, which increases the driving force. Compared with a piston-cylinder drive structure, the drive structure of this clamping portion can avoid the valve core from getting stuck, making it more adaptable to the working environment within the abdominal cavity. The opposite sides of the valve core 1 are fixedly connected to the first clamping portion 201 and the second clamping portion 202, respectively, increasing the connection strength between the valve core 1 and the clamping portion 2 and making the positioning of the valve core 1 more precise within the closed loop formed by the drive unit and the clamping portion 2. The two ends of the drive capsule 3 are connected to the side walls of the connector 4, increasing the contact area between the drive capsule 3 and the connector 4 and making the connection more stable.

[0038] The SMA wire 5 is in a bent state below 42°C to maintain the bent state in the human body. The SMA wire 5 changes from a bent state to an extended state between 42°C and 50°C. The SMA wire 5 at 42°C begins to deform and straighten. This temperature is different from the temperature in the human body, which prevents the SMA wire 5 from deforming due to the patient's fever, thereby ensuring the accuracy of the urethral valve control. Two SMA wires 5 are provided in the driving part, so that when the SMA wire 5 deforms after the temperature of the magnetic fluid 6 rises, the driving force on the clamping part 2 is greater, and the driving effect is better. The SMA wire 5 is in a cross state when bent, which reduces the space occupied by the SMA wire 5 after bending, and prevents the SMA wire 5 from contacting the driving capsule 3 after bending, causing the driving capsule 3 to deform.

[0039] The clamping portion 2 and connector 4 are made of non-metallic materials and have no magnetic field or shielding effects. The valve core 1 is made of silicone rubber, a material with excellent biocompatibility. Silicone rubber can mimic the shape, contraction, and relaxation of the external urethral sphincter, effectively controlling the opening and closing of the urethra. When the urethra is closed, the inner wall of the valve core 1 conforms to the outer wall of the urethra, ensuring uniform clamping pressure on the outer wall, preventing mechanical damage to the organ and tissue necrosis caused by poor blood circulation. The drive capsule 3 is a flexible rubber membrane that contracts and extends in response to the bending and straightening of the SMA wire 5.

[0040] Example 3

[0041] Example 3 of a urethral valve driven by a magnetic induction heating power supply SMA wire, as shown in FIG. Figure 5 As shown, based on Example 1 or Example 2, the alternating magnetic field generating device 7 is further limited.

[0042] Specifically, the alternating magnetic field generating device 7 includes an alternating current generator 701 and a coil 702 . The alternating current generator 701 and the coil 702 are electrically connected. The alternating current generator 701 is used to generate an alternating current, and the coil 702 is used to generate an alternating magnetic field after the alternating current flows through it.

[0043] The beneficial effects of this embodiment are as follows: the alternating magnetic field generating device 7 is located outside the patient's body, and the alternating current generator 701 provides a sinusoidal alternating voltage source when working. After being connected to the coil 702, a current is generated in the coil 702. At the same time, the coil 702 generates an alternating magnetic field, providing a magnetic field environment for the magnetic fluid 6 in the patient's body to generate heat.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A urethral valve driven by SMA wire powered by magnetic induction heating, characterized in that: The invention comprises a valve body located inside the body and an alternating magnetic field generating device (7) located outside the body for generating an alternating magnetic field, wherein the valve body comprises a valve core (1), a clamping portion (2) and a driving portion, wherein the valve core (1) is connected to the clamping portion (2), and the driving portion comprises a driving capsule (3), a connecting member (4), an SMA wire (5) and a magnetic fluid (6), wherein the driving capsule (3) and the connecting member (4) form a sealed cavity, wherein the magnetic fluid (6) and the SMA wire (5) are both located in the inner cavity of the sealed cavity, wherein the SMA wire (5) is connected to the connecting member (4), and the connecting member (4) is connected to the clamping portion (2), wherein the driving capsule (3) is an elastic film, wherein the magnetic fluid (6) generates heat when in the alternating magnetic field generated by the alternating magnetic field generating device (7), and wherein the SMA wire (5) is initially in a bent state and straightens after being heated; The clamping portion (2) includes a first clamping portion (201) and a second clamping portion (202); the connecting member (4) includes a first connecting member (401) and a second connecting member (402); the first connecting member (401) and the second connecting member (402) are connected to the first clamping portion (201) and the second clamping portion (202) respectively; the valve body includes two driving portions, the two driving portions are connected to the two ends of the first clamping portion (201) and the second clamping portion (202) respectively so that the two driving portions and the first clamping portion (201) and the second clamping portion (202) form a closed loop; the valve core (1) is located in the inner cavity of the closed loop; The two ends of the side wall of the driving capsule (3) are respectively connected to the side walls of the first connecting member (401) and the second connecting member (402), the two ends of the SMA wire (5) are respectively connected to the end faces of the first connecting member (401) and the second connecting member (402), and the other end face of the first connecting member (401) and the other end face of the second connecting member (402) are respectively connected to the first clamping portion (201) and the second clamping portion (202).

2. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 1, characterized in that: Two opposite sides of the valve core (1) are fixedly connected to the first clamping portion (201) and the second clamping portion (202) respectively.

3. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 1, characterized in that: The SMA wire (5) is in a bent state below 42°C, and changes from the bent state to a straight state between 42°C and 50°C.

4. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 3, characterized in that: The SMA wire (5) comprises a first SMA wire (501) and a second SMA wire (502), wherein the first SMA wire (501) is located on a side of the first connecting member (401) away from the valve core (1); and the second SMA wire (502) is located on a side of the first connecting member (401) close to the valve core (1).

5. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 4, characterized in that: When the SMA wire (5) is bent, the first SMA wire (501) bends toward the second SMA wire (502), and the second SMA wire (502) bends toward the first SMA wire (501).

6. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 1, characterized in that: The clamping portion (2) is made of a non-metallic material, and the connecting piece (4) is made of a non-metallic material.

7. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 1, characterized in that: The valve core (1) is made of silicone rubber, and the driving capsule (3) is made of rubber.

8. The urethral valve driven by SMA wire powered by magnetic induction heating according to claim 1, characterized in that: The alternating magnetic field generating device (7) comprises an alternating current generator (701) and a coil (702), wherein the alternating current generator (701) and the coil (702) are electrically connected, the alternating current generator (701) is used to generate an alternating current, and the coil (702) is used to generate an alternating magnetic field after the alternating current flows through it.

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