A cervical cerclage teaching practice device simulating cervical incompetence

Abstract

The utility model relates to medical teaching device technical field discloses a kind of cervical loop binding teaching practice devices of simulated cervical insufficiency, including pig belly water bag model and base, the pig belly water bag model includes by simulated cervical insufficiency outer wrapper and simulated amniotic sac internal filler, pig belly pylorus in model has simulated this special anatomical structure and human cervical texture in human cervical internal orifice, simultaneously, rubber sleeve has simulated the state of amniotic sac very realistically, the model presents cervical insufficiency state realistically.Simultaneously base can be adjusted height according to need, adapt to different height student or simulate different cervical position.

Description

Technical Field

[0001] This utility model relates to the field of medical teaching device technology, specifically a cervical cerclage teaching and practice device simulating cervical insufficiency. Background Technology

[0002] Cervical insufficiency refers to painless dilation of the cervix during mid-pregnancy. In severe cases, the amniotic sac protrudes from the cervical os, making it impossible to continue the pregnancy and leading to the delivery of the fetus (miscarriage or premature birth). Its incidence rate is 0.5%-1% of all pregnant women and accounts for 8%-9% of all premature births. It is a significant cause of adverse pregnancy outcomes and neonatal mortality. Premature infants consume substantial medical resources and incur high costs, placing a huge burden on the country and society. Furthermore, premature infants face various long-term complications. Therefore, the treatment of patients with cervical insufficiency is particularly important, and cervical cerclage is the most effective treatment. The inventor team has long been engaged in clinical surgical procedures and related research on cervical insufficiency. However, they have found that currently, there is no teaching model that can effectively simulate the pathological state of cervical insufficiency, both domestically and internationally. This limits the teaching and promotion of cervical cerclage techniques. Therefore, developing a realistic simulation teaching model of the pathological state of cervical insufficiency, especially a highly adjustable device that facilitates teaching practice, is crucial and has significant economic and social benefits. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a cervical cerclage teaching and practice device that simulates cervical insufficiency. It features a pig-belly water sac model that realistically simulates the state of human cervical insufficiency and an attached worktable with a support structure that allows for height and pressure adjustment, thus solving the problems mentioned in the background technology.

[0004] (II) Technical Solution To achieve the aforementioned purpose of having a supporting structure and adjustable height, this utility model provides the following technical solution: a cervical cerclage teaching and practice device simulating cervical insufficiency, comprising a pig stomach water-filled sac model 5. The pig stomach water-filled sac model consists of an external wrapping material simulating the cervical canal and an internal filling material simulating the amniotic sac. The external wrapping material is a pig stomach with a pyloric portion retained for 1cm-5cm. The internal filling material is a water-injected rubber sleeve, which is thin and elastic. Physiological saline is injected into the rubber sleeve to expand the pyloric glands of the pig stomach. The water-injected rubber sleeve is then inserted into the pyloric portion of the pig stomach. A detachable binding thread is provided at the other end of the pig stomach to fix the water-injected rubber sleeve inside the pig stomach and to create a certain degree of compression effect, causing the end of the water-injected rubber sleeve to protrude outside the pylorus of the pig stomach, thereby simulating the state of cervical insufficiency. Furthermore, the degree of protrusion of the end of the water-injected rubber sleeve changes accordingly after being subjected to pressure.

[0005] As a novel approach, the cervical cerclage teaching practice device also includes a base, on the top of which a mounting frame is fixedly installed, and on the top of the mounting frame a lighting component is provided. On the bottom of the base, an anti-slip seat is fixedly installed, and on the bottom of the base, a counterweight is fixedly installed. An adjustment mechanism extending to the front of the mounting frame is provided on the inner side of the mounting frame, and a support mechanism is provided on the right side of the adjustment mechanism. A pig-stomach water sac model is provided on the inner side of the support mechanism, and a pressing mechanism extending above and fitting against the pig-stomach water sac model is provided on the top of the support mechanism. The lighting assembly includes an adjustment bracket, which is fixedly mounted on the top of the mounting frame, and a lighting lamp is movably mounted on the bottom of the adjustment bracket.

[0006] Preferably, the adjustment mechanism includes a support plate. The support plate is fixedly installed between the upper and lower sides of the inner wall of the mounting frame. A movable block is slidably installed on the outer side of the support plate. A threaded rod located on the left side of the support plate is rotatably connected between the upper and lower sides of the inner wall of the mounting frame. A threaded block is threadedly connected to the outer side of the threaded rod. The threaded block is fixedly connected to the left side of the movable block. A support block is fixedly installed on the inner bottom wall of the mounting frame. A rotating rod extending to the front side of the mounting frame is rotatably connected to the rear side of the support block. A gear meshing with each other is fixedly installed at the rear end of the rotating rod and the outer side of the threaded rod. A rotating wheel is fixedly installed at the front end of the rotating rod. An installation hole is opened inside the movable block. A vertical plate extending to the bottom of the movable block is slidably installed between the front and rear sides of the inner wall of the installation hole. A pull rod extending to the right side of the movable block is fixedly installed on the right side of the vertical plate. A fixing spring fixedly connected to the right side of the inner wall of the installation hole is fixedly installed on the right side of the vertical plate. A locking block that engages with the support plate is fixedly installed on the left side of the vertical plate.

[0007] Preferably, the support mechanism includes a U-shaped frame, with a U-shaped frame extending to the right side of the mounting frame fixedly installed between the front and rear sides of the movable block, a bracket fixedly installed on the right side of the U-shaped frame, and an operating table provided below the bracket.

[0008] Preferably, the pig stomach water bladder model includes a pig stomach, which is placed inside the bracket. A rubber sleeve is placed inside the pig stomach. The pressing mechanism includes an electric telescopic rod. The electric telescopic rod is fixedly installed on the top of the U-shaped frame. A strip plate is fixedly installed at the output end of the electric telescopic rod. A pressure plate that fits against the pig stomach is fixedly installed at the bottom of the strip plate.

[0009] Preferably, the inner side of the rubber sleeve is filled with saline solution and one end is fixed by a strap, and the top of the bracket is provided with a placement groove.

[0010] Preferably, the support plate has a locking hole inside that matches the locking block. The number of locking holes shall not be less than six and they shall be evenly distributed from top to bottom. The right side of the movable block has a through hole that communicates with the right side of the inner wall of the mounting hole. The size of the through hole is adapted to the pull rod.

[0011] (III) Beneficial Effects Compared with the prior art, this utility model provides a cervical cerclage teaching and practice device that simulates cervical insufficiency, which has the following beneficial effects: This cervical cerclage teaching and practice device, through the inclusion of an adjustment mechanism, a support mechanism, and a pig-stomach water-filled sac model, uses a rotating wheel to drive a rotating rod. Through gear meshing, the threaded rod rotates synchronously. A threaded block, threadedly engaged with the threaded rod and slidably connected to the support plate via a moving block, converts the rotational motion into linear motion, driving the U-shaped frame to rise and fall vertically. This allows for height adjustment as needed. A fixed spring pushes a locking block into a locking hole in the support plate, forming a mechanical locking structure to prevent the U-shaped frame from shifting due to external forces during practice. When height adjustment is required, pulling the lever disengages the locking block from the locking hole, releasing the lock. The evenly spaced locking holes on the support plate allow for precise height adjustment at fixed intervals, accommodating different body shapes. The model, designed to simulate different cervical positions for trainees of varying heights, utilizes a U-shaped frame and a support structure to form an L-shaped support structure. A placement slot at the top of the support matches the curvature of the pig's stomach bottom, using gravity and friction to secure the model and prevent slippage. The pig's stomach, a natural biological material, has a mucosal layer with similar elasticity and thickness to the cervical mucosa, providing a realistic tactile experience. An internal rubber sleeve simulates the amniotic sac, filled with saline solution to simulate amniotic fluid. Straps are used to adjust pressure and regulate the size of the protruding sac. The saline-filled rubber sleeve is inserted into the pig's stomach and placed at the pyloric gland area. A thread is tied to the other end of the pig's stomach to maintain tension on the internal sac. The size of the sac protruding from the pylorus can be adjusted as needed, achieving a support structure with adjustable height. Attached Figure Description

[0012] Figure 1 This is a three-dimensional view of the structure of this utility model; Figure 2 This is a left-side sectional perspective view of a partial structure of this utility model; Figure 3 This is a bottom sectional perspective view of a partial structure of this utility model; Figure 4 This is a partial sectional perspective view of the present invention; Figure 5 This is an exploded cross-sectional view of a portion of the structure of this utility model; Figure 6 This is a photograph of the actual pig stomach water sac model.

[0013] In the diagram: 1. Base, 2. Mounting frame, 3. Adjustment mechanism, 301. Support plate, 302. Moving block, 303. Threaded rod, 304. Threaded block, 305. Support block, 306. Rotating rod, 307. Gear, 308. Rotating wheel, 309. Mounting hole, 310. Vertical plate, 311. Pull rod, 312. Fixing spring, 313. Locking block, 4. Support mechanism, 41. U-shaped frame, 42. Bracket, 43. Operating table, 5. Pig stomach water bladder model, 51. Pig stomach, 52. Rubber sleeve, 6. Lighting assembly, 61. Adjustment frame, 62. Lighting lamp, 7. Anti-slip seat, 8. Counterweight, 9. Pressing mechanism, 91. Electric telescopic rod, 92. Strip plate, 93. Pressure plate. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-6 This utility model provides a technical solution: a cervical cerclage teaching and practice device simulating cervical insufficiency, including a base 1, an installation frame 2 fixedly installed on the top of the base 1, a lighting component 6 provided on the top of the installation frame 2, an anti-slip seat 7 fixedly installed on the bottom of the base 1 to increase the friction between the base and the table and prevent the device from sliding, a counterweight 8 fixedly installed on the bottom of the base 1 to lower the center of gravity of the device and enhance stability, an adjustment mechanism 3 extending to the front of the installation frame 2 is provided on the inner side of the installation frame 2, a support mechanism 4 is provided on the right side of the adjustment mechanism 3, a pig stomach water sac model 5 is provided on the inner side of the support mechanism 4, and a pressing mechanism 9 extending above and fitting with the pig stomach water sac model 5 is provided on the top of the support mechanism 4.

[0016] The pig stomach water sac model 5 consists of an external wrapping material simulating the cervical canal and an internal filling material simulating the amniotic sac. The external wrapping material is a pig stomach with a length of 1cm-5cm retaining the pyloric region. The internal filling material is a thin and elastic rubber sleeve. Physiological saline is injected into the rubber sleeve. After expanding the pyloric gland area of ​​the pig stomach, the water-filled rubber sleeve is inserted into the pyloric region of the pig stomach. A detachable binding line is provided at the other end of the pig stomach to fix the water-filled rubber sleeve inside the pig stomach, and the end of the water-filled rubber sleeve protrudes outside the pylorus of the pig stomach. The degree of protrusion of the water-filled rubber sleeve changes accordingly after pressure is applied. As a natural biological material, pig stomach has anatomical characteristics similar to the pyloric gland region and the internal os of the cervix. The texture of the pylorus is similar to that of the cervix in terms of elasticity and thickness, providing a realistic tactile experience. The water-filled rubber sleeve placed inside simulates the amniotic sac, and physiological saline is filled to simulate amniotic fluid. It is fixed with a ligation line to adjust the pressure and adjust the size of the protrusion of the water sac. The rubber sleeve filled with physiological saline is inserted into the pig stomach and placed in the pyloric gland region. The other end of the pig stomach is tied with a ligation line to give the water sac inside a certain tension. The size of the water sac protruding from the pylorus can be adjusted as needed, thereby simulating the state of cervical insufficiency. With the addition of a support structure, the height can be adjusted.

[0017] The lighting assembly 6 includes an adjustment bracket 61. The adjustment bracket 61 is fixedly installed on the top of the mounting frame 2, and the lighting lamp 62 is movably installed on the bottom of the adjustment bracket 61. The adjustment bracket 61 supports multi-angle adjustment of the lighting lamp 62.

[0018] The adjustment mechanism 3 includes a support plate 301. The support plate 301 is fixedly installed between the upper and lower sides of the inner wall of the mounting frame 2. A movable block 302 is slidably installed on the outer side of the support plate 301. A threaded rod 303 located on the left side of the support plate 301 is rotatably connected between the upper and lower sides of the inner wall of the mounting frame 2. A threaded block 304 is threadedly connected to the outer side of the threaded rod 303. The threaded block 304 is fixedly connected to the left side of the movable block 302. A support block 305 is fixedly installed on the inner bottom wall of the mounting frame 2. A rotating rod 306 extending to the front side of the mounting frame 2 is rotatably connected to the rear side of the support block 305. One rear end of the rotating rod 306 is fixedly connected to the outer side of the threaded rod 303. A gear 307 is fixedly installed, meshing with each other. A rotating wheel 308 is fixedly installed at the front end of the rotating rod 306. An installation hole 309 is opened inside the moving block 302. A vertical plate 310 extending to the bottom of the moving block 302 is slidably installed between the front and rear sides of the inner wall of the installation hole 309. A pull rod 311 extending to the right side of the moving block 302 is fixedly installed on the right side of the vertical plate 310. A fixing spring 312 fixedly connected to the right side of the inner wall of the installation hole 309 is fixedly installed on the right side of the vertical plate 310. The elastic coefficient of the fixing spring 312 can be set according to the requirements. A locking block 313 that engages with the support plate 301 is fixedly installed on the left side of the vertical plate 310.

[0019] The support plate 301 has a locking hole inside that matches the locking block 313. The number of locking holes shall not be less than six and they shall be evenly distributed from top to bottom. The right side of the moving block 302 has a through hole that connects to the right side of the inner wall of the mounting hole 309. The size of the through hole matches the pull rod 311.

[0020] The support mechanism 4 includes a U-shaped frame 41. The U-shaped frame 41, extending to the right side of the mounting frame 2, is fixedly installed between the front and rear sides of the movable block 302. A bracket 42 is fixedly installed on the right side of the U-shaped frame 41, fixing the model position via a placement slot. An operating table 43 is provided below the bracket 42 for convenient practice by operators. Furthermore, those skilled in the art should understand that, for convenience, the operating table 43 can be set separately and does not need to be fixedly connected to the base. For example, it can be configured as an operating table with adjustable leg height to accommodate U-shaped frames 41 of different heights. The operating table has a conventional structure; the legs are not shown in the accompanying drawings, and its structure will not be described in detail here.

[0021] The pig stomach 51 of the pig stomach water-filled model 5 is placed inside the bracket 42. A rubber sleeve 52 is placed inside the pig stomach 51. The composite model of the pig stomach 51 and the rubber sleeve 52 restores the elasticity of the cervical mucosa and the tension feedback of the cervical canal. The pressing mechanism 9 includes an electric telescopic rod 91. The electric telescopic rod 91 is fixedly installed on the top of the U-shaped frame 41. A strip plate 92 is fixedly installed at the output end of the electric telescopic rod 91. A pressure plate 93 that fits against the pig stomach 51 is fixedly installed at the bottom of the strip plate 92. By activating the electric telescopic rod 91, the strip plate 92 and the pressure plate 93 move up and down synchronously, which can adjust the pressure on the pig stomach 51, thereby adjusting the protrusion of the end of the water-filled rubber sleeve 52, thus simulating the cervical os of cervical insufficiency in different pathological states. The electric telescopic rod 91 is a commercially available product that is charged by a lithium battery. Because the pressure does not need to be too high, the electric telescopic rod does not need to have a large power and size.

[0022] The inside of the rubber sleeve 52 is filled with saline solution and one end is fixed by a strap. The top of the bracket 42 has a placement groove.

[0023] When using the device, place it on a flat tabletop, ensuring stability with the anti-slip base 7 and counterweight 8. Connect the power supply and check if the light 62 is working properly. After cleaning the pig stomach 51, lay it flat in the placement slot of the bracket 42. Wearing gloves, check the condition of the pig stomach 51, trim the pylorus to the appropriate length, and dilate the pyloric gland area to the appropriate extent (1-5cm) by hand or with tools to facilitate the subsequent placement of the water sac. Unfold the rubber sleeve 52, inject an appropriate amount of physiological saline into the rubber sleeve 52, and tie the opening end tightly with a strap. To prevent fluid leakage, a water-filled sac is made. A rubber sleeve 52 is placed inside the pig's stomach 51, positioned at the pyloric gland area. The other end of the pig's stomach 51 is tied with thread to maintain tension on the water-filled sac. The size of the water-filled sac protruding from the pylorus is adjusted as needed. The sac is inserted into the pig's stomach 51 to simulate the state of an amniotic sac protruding from the cervix. The size of the exposed sac is adjusted as needed, and the pig's stomach 51 is tied at the rear to maintain tension and keep the sac protruding. The height is then adjusted by holding the lever 311 with the right hand and pulling it outwards to engage the locking mechanism. 313 disengages from the locking hole, while simultaneously holding the U-shaped frame 41 with the left hand to prevent falling. Rotate the rotating wheel 308, which, through gear transmission, causes the threaded rod 303 to rotate, raising the U-shaped frame 41. Reverse rotation lowers it. Adjust to a suitable position according to the student's height or the simulated scene. After adjustment, release the pull rod 311. The fixing spring 312 pushes the locking block 313 into the nearest locking hole, producing a "click" sound to confirm locking. Hold the lighting lamp 62 and rotate the adjustment bracket 61 to focus the light on the simulated cervical area of ​​the pig's belly 51. To avoid direct light shining into the trainees' eyes, the brightness was adjusted to a medium level to ensure clarity while reducing glare. After setting up the adjusted worktable, the cervical ligation practice could begin. After the practice, the pig stomach 51 and rubber sleeve 52 were disposed of as medical waste to avoid cross-contamination from reuse. The contact parts such as the U-shaped frame 41 and bracket 42 were wiped with 75% alcohol, dried, and then stored. Medical grease was applied to rotating parts such as the threaded rod 303 and gear 307 regularly to prevent rust.

[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0025] In summary, this cervical cerclage teaching and practice device, through the setting of adjustment mechanism 3, support mechanism 4, and pig stomach water sac model 5, rotates the rotating wheel 308 to drive the rotating rod 306 to rotate, and through the meshing transmission of gear 307, the threaded rod 303 rotates synchronously. The threaded block 304, due to its threaded engagement with the threaded rod 303 and its sliding connection with the support plate 301 through the moving block 302, converts the rotational motion into linear motion, driving the U-shaped frame 41 to rise and fall vertically, thereby adjusting the height as needed. Under the action of the fixed spring 312, the vertical plate 310 pushes the locking block 313 to embed into the locking hole of the support plate 301, forming a mechanical locking structure to prevent the U-shaped frame 41 from shifting due to external force during practice. When the height needs to be adjusted, pulling the pull rod 311 causes the locking block 313 to disengage from the locking hole, releasing the lock. The locking holes evenly distributed on the support plate 301 support the precise adjustment of the height at fixed intervals, adapting to different needs. For students of different heights or to simulate different cervical positions, the U-shaped frame 41 and bracket 42 form an L-shaped support structure. The placement groove at the top of the bracket 42 matches the curvature of the bottom of the pig stomach 51. The model is fixed by gravity and friction to prevent slippage. The pig stomach 51, as a natural biological material, has a mucosal layer with similar elasticity and thickness to the cervical mucosa, providing a realistic tactile feel. The rubber sleeve 52 inside simulates the cervical canal, and physiological saline is filled to simulate amniotic fluid. The straps are used to fix it to prevent liquid leakage. The rubber sleeve 52 filled with physiological saline is inserted into the pig stomach 51 and placed at the pyloric gland area. The other end of the pig stomach is tied with a thread to give the water sac inside a certain tension. The size of the water sac protruding from the pylorus can be adjusted as needed. This achieves the purpose of having a support structure and being height-adjustable, solving the problem that the lack of a corresponding support structure during the demonstration and the inconvenience of height adjustment affected the teaching and practice, resulting in low practicality.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cervical cerclage teaching and practice device simulating cervical insufficiency, characterized in that: The system includes a pig stomach water sac model (5), which consists of an external wrapping material simulating cervical insufficiency and an internal filling material simulating amniotic sac. The external wrapping material is a pig stomach (51) with a pyloric region of 1-5 cm. The internal filling material is a thin and elastic rubber sleeve (52). The rubber sleeve is filled with physiological saline. After the pyloric gland area of ​​the pig stomach is expanded, the water-filled rubber sleeve is inserted into the pyloric region of the pig stomach. A detachable binding line is provided at the other end of the pig stomach to fix the water-filled rubber sleeve inside the pig stomach and make the end of the water-filled rubber sleeve protrude to the outside of the pylorus of the pig stomach. It also includes a base (1), a mounting frame (2) is fixedly installed on the top of the base (1), a lighting component (6) is provided on the top of the mounting frame (2), an anti-slip seat (7) is fixedly installed on the bottom of the base (1), a counterweight (8) is fixedly installed on the bottom of the base (1), an adjustment mechanism (3) extending to its front side is provided on the inner side of the mounting frame (2), a support mechanism (4) is provided on the right side of the adjustment mechanism (3), a pig stomach water bladder model (5) is provided on the inner side of the support mechanism (4), and a pressing mechanism (9) extending to and fitting with the pig stomach water bladder model (5) is provided on the top of the support mechanism (4). The lighting assembly (6) includes an adjustment bracket (61), the adjustment bracket (61) is fixedly installed on the top of the mounting frame (2), and a lighting lamp (62) is movably installed on the bottom of the adjustment bracket (61).

2. The cervical cerclage teaching and practice device simulating cervical insufficiency according to claim 1, characterized in that: The adjustment mechanism (3) includes a support plate (301). The support plate (301) is fixedly installed between the upper and lower sides of the inner wall of the mounting frame (2). A moving block (302) is slidably installed on the outer side of the support plate (301). A threaded rod (303) located on the left side of the support plate (301) is rotatably connected between the upper and lower sides of the inner wall of the mounting frame (2). A threaded block (304) is threadedly connected to the outer side of the threaded rod (303). The threaded block (304) is fixedly connected to the left side of the moving block (302). A support block (305) is fixedly installed on the inner bottom wall of the mounting frame (2). A rotating rod (306) extending to the front side of the mounting frame (2) is rotatably connected to the rear side of the support block (305). The rear side of the rotating rod (306) One end of the threaded rod (303) is fixedly installed with a gear (307) that meshes with each other. The front end of the rotating rod (306) is fixedly installed with a rotating wheel (308). The moving block (302) has an installation hole (309) inside. The inner wall of the installation hole (309) is slidably installed between the front and rear sides, and a vertical plate (310) extending to the bottom of the moving block (302) is installed between the front and rear sides. A pull rod (311) extending to the right side of the moving block (302) is fixedly installed on the right side of the vertical plate (310). A fixing spring (312) fixedly connected to the right side of the inner wall of the installation hole (309) is fixedly installed on the right side of the vertical plate (310). A locking block (313) that engages with the support plate (301) is fixedly installed on the left side of the vertical plate (310).

3. The cervical cerclage teaching and practice device simulating cervical insufficiency according to claim 2, characterized in that: The support mechanism (4) includes a U-shaped frame (41). The U-shaped frame (41) extending to the right side of the mounting frame (2) is fixedly installed between the front and rear sides of the movable block (302). A bracket (42) is fixedly installed on the right side of the U-shaped frame (41). An operating table (43) is provided below the bracket (42).

4. The cervical cerclage teaching and practice device simulating cervical insufficiency according to claim 3, characterized in that: The pig stomach water bladder model includes a pig stomach (51), which is placed inside the bracket (42). A rubber sleeve (52) is placed inside the pig stomach (51). The pressing mechanism (9) includes an electric telescopic rod (91). The electric telescopic rod (91) is fixedly installed on the top of the U-shaped frame (41). A strip plate (92) is fixedly installed at the output end of the electric telescopic rod (91). A pressure plate (93) that fits against the pig stomach (51) is fixedly installed at the bottom of the strip plate (92).

5. The cervical cerclage teaching and practice device simulating cervical insufficiency according to claim 4, characterized in that: The inner side of the rubber sleeve (52) is filled with saline solution and one end is fixed by a strap. The top of the bracket (42) is provided with a placement groove.

6. The cervical cerclage teaching and practice device simulating cervical insufficiency according to claim 5, characterized in that: The support plate (301) has a locking hole inside that is compatible with the locking block (313). The number of locking holes shall not be less than six and they shall be evenly distributed from top to bottom. The moving block (302) has a through hole on the right side that is connected to the right side of the inner wall of the mounting hole (309). The size of the through hole is compatible with the pull rod (311).

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