Leak-proof water bag assembly and water bag midwifery instrument

Abstract

The application relates to the technical field of medical equipment, and discloses a water bag assembly capable of preventing leakage and a water bag midwifery instrument, which comprises a water injection cylinder, a mounting seat and a water bag body. One end of the water injection cylinder is fixedly provided with a connecting pipe, and a plug-in groove is formed in the end of the connecting pipe. When the water bag is broken or leaks, the water injection resistance will suddenly decrease, at this moment, the external force on the compressed precision spring is reduced, the precision spring rapidly rebounds under the elastic action of the precision spring, the pointer is quickly reset through the rotation angle sensor, when the obvious pointer rebound phenomenon appears, the driving motor transmits an electric signal to the body, the red indicator light is turned on, and the prompter emits a prompt sound, the prompt sound can be set as relatively brisk music, so that the interference on the pregnant woman is avoided, medical staff can judge the abnormal phenomenon of the water bag body in the water injection process, and the water injection operation needs to be immediately stopped.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically to a leak-proof water bag assembly and a water bag delivery device. Background Technology

[0002] The water balloon delivery device uses a water balloon instead of the fetal head, placing the water balloon successively into the cervical canal and birth canal, gradually injecting water into the water balloon to mechanically dilate the birth canal. However, many problems that urgently need to be solved have been exposed in clinical practice.

[0003] In existing water-filled birthing devices, the connection between the water bag and the injection device often uses a simple plug-and-play structure, which lacks stability. Under the pressure of continuous water injection, the connection is prone to loosening and displacement, leading to leakage of saline solution and contamination of the operating area. Furthermore, existing equipment generally lacks a real-time monitoring mechanism. When encountering quality problems such as aging of the water bag material or manufacturing defects, or human factors such as improper control of the injection speed or excessive force by medical staff, sudden rupture and leakage of the water bag may go undetected. This monitoring blind spot may lead to adverse reactions in the mother, such as vaginal mucosal damage and sudden changes in uterine pressure. In severe cases, it may even cause uterine atony, interruption of the delivery process, or medical accidents. Moreover, due to the relatively simple structure of existing water bags, there is no structural constraint during inflation and expansion, making it prone to local bulging, lateral wall depression, and irregular overall shape. This can easily cause local stress concentration, resulting in single-point compression of the cervical canal tissue, leading to tissue ischemia, edema, and severe pain, causing discomfort to the mother. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a leak-proof water bag assembly and a water bag delivery device to solve the problems existing in the background art.

[0005] This invention provides the following technical solution: a leak-proof water bladder assembly, comprising a water injection cylinder, a mounting base, and a water bladder body. A connecting pipe is fixedly installed at one end of the water injection cylinder, and an insertion groove is provided at the end of the connecting pipe. One end of the water bladder body is inserted into the insertion groove via a mounting unit. A seepage monitoring unit is provided on the inner wall of the insertion groove. A piston plate is slidably installed inside the water injection cylinder. A push rod is fixedly installed at one end of the piston plate. A spring resistance feedback unit is provided inside the push rod. The spring resistance feedback unit includes a compression plate. A compression groove is jointly provided inside the piston plate and the push rod. The compression plate is slidably installed inside the compression groove. A square cavity is provided inside the push rod. A compression shaft is fixedly installed on the side of the compression plate. A precision spring is sleeved on the outer wall of the compression shaft. The other end of the compression shaft extends into the square cavity and is provided with a displacement measuring element. An indicating unit is provided on the mounting base, and the indicating unit is electrically connected to the displacement measuring element.

[0006] Preferably, the installation unit includes a rotating sleeve, and a rotating groove is formed on the outer peripheral wall of the connecting pipe. A limiting ring is rotatably installed in the rotating groove. The outer peripheral wall of the limiting ring is fixedly connected to the inner peripheral wall of the rotating sleeve. One end of the rotating sleeve extends to the outside of the connecting pipe and is connected to the water bag body through a threaded connection element.

[0007] Preferably, one end of the water bladder body is provided with a stepped structure, the outer diameter of the stepped structure is the same as the inner diameter of the rotating sleeve, the outer peripheral wall of the stepped structure is provided with an external thread groove, the inner peripheral wall of the rotating sleeve is provided with an internal thread, and the internal thread is threadedly connected to the external thread groove.

[0008] Preferably, a rotating ring is fixedly sleeved on the outer periphery of the rotating sleeve, and the outer periphery of the rotating ring is provided with multiple anti-slip grooves.

[0009] Preferably, the seepage monitoring unit includes a humidity sensor, the inner wall of the insertion slot is provided with an installation groove, the humidity sensor is fixedly installed in the installation groove, a sponge gasket is fixedly installed on the inner wall of the insertion slot, the outer wall of the sponge gasket is in contact with the humidity sensor, and the inner wall of the sponge gasket is in contact with the stepped structure.

[0010] Preferably, the displacement measuring element includes a rotating shaft, with its two ends rotatably mounted on opposite inner walls of the square cavity. A device groove is formed on the inner side wall of the square cavity, and a rotation angle sensor is fixedly installed in the device groove. One end of the rotating shaft is connected to the rotation angle sensor. A gear is fixedly sleeved on the outer circumferential wall of the rotating shaft. A cross groove is formed at the end of the extrusion shaft, and a straight rack that meshes with the gear is fixedly installed on the bottom inner wall of the cross groove.

[0011] Preferably, the indicating unit includes a dial, which is fixedly installed on the top of the mounting base. A rotating rod is rotatably installed on the top of the mounting base. A pointer is fixedly sleeved on the outer periphery of the rotating rod. A device cavity is opened inside the mounting base. A drive motor is fixedly installed on the top inner wall of the device cavity. The output shaft of the drive motor is connected to the end of the rotating rod. A plurality of heat dissipation holes are evenly opened on the bottom inner wall of the device cavity. The indicator unit also includes three indicator lights and a prompter. The three indicator lights and the prompter are all electrically connected to the drive motor. The colors of the three indicator lights are green, yellow and red, respectively.

[0012] Preferably, the water-filled balloon body includes a cervical spherical water-filled balloon, an inner tube, a positioning rubber ring, a longitudinal shaping rib, an annular traction rib, a heat-conducting sealing layer, and an injection hard valve. The fixed sleeve is fitted on the outside of the water-filled balloon body, and initially flattens out and fits the water-filled balloon body. The injection hard valve is located on the outside of the water-filled balloon body and is connected to the inner tube. The inner tube is located on the inner wall of the water-filled balloon body and is connected to the heat-conducting sealing layer. The positioning rubber ring is located on the inner top wall of the cervical spherical water-filled balloon. The annular traction rib is located in the upper, middle, and lower sections of the cervical spherical water-filled balloon, and the annular rib has a closed-loop structure. The longitudinal shaping ribs are evenly distributed along the circumference of the water bladder, forming a cage-like biomimetic mesh skeleton, which limits the maximum tensile deformation of the water bladder and prevents excessive elongation, skew, and displacement. The thermally conductive sealing layer is set on the inner bottom wall of the cervical spherical water balloon, and the longitudinal shaping ribs, annular traction ribs, positioning rubber rings, and thermally conductive sealing layer are completely embedded inside the wall interlayer of the cervical spherical water balloon.

[0013] Preferably, the water injection cylinder is made of a transparent material, specifically polypropylene. The outer wall of the water injection cylinder is provided with a scale strip, and every five scale strips correspond to a water volume of 25 ml. The outer wall of the piston plate is provided with an annular groove, and a sealing gasket is provided in the annular groove.

[0014] A water bag delivery device includes a leak-proof water bag assembly as described in any of the above claims: a connecting hose is installed on the main body, the other end of the connecting hose is connected to the inside of the water injection cylinder, a square groove is provided on the main body, the mounting base is fixedly installed in the square groove, and the three indicator lights and the prompter are all fixedly installed on the main body.

[0015] The beneficial effects of this invention compared to the prior art are: 1. Insert one end of the water bladder body into the connecting tube, rotate the rotating ring to drive the rotating sleeve to rotate, thereby installing the water bladder body through the threaded connection between the internal thread and the external thread groove until the end of the stepped structure fits against the inner wall of the insertion groove. The installation operation is complete. The entire installation process is simple, and during subsequent use, the rotating sleeve can be limited by pinching the anti-slip groove with your fingers to prevent loosening.

[0016] 2. When water leakage occurs at the connection between the connecting pipe and the water bladder body, the sponge gasket absorbs the leaked water. When the humidity sensor detects that the sponge gasket has become wet, it sends an electrical signal to the staff to prompt them to check in time.

[0017] 3. During normal water filling, as the water bladder gradually fills, the water filling resistance will steadily increase. At this time, the precision spring will be gradually compressed as the resistance increases, eventually causing the pointer to rotate clockwise at a constant speed on the dial. When the water bladder ruptures or leaks, the water filling resistance will suddenly drop sharply. At this time, under the elastic action of the precision spring, the pointer will eventually rotate counterclockwise to reset.

[0018] 4. The water-filled balloon assembly in this device uses three closed annular traction ribs (upper, middle, and lower) inside the balloon to evenly distribute pressure within the balloon, constraining its inflation shape and ensuring it expands into a standard ellipsoidal shape without bulges or depressions. This avoids localized stress concentration, ensures uniform pressure on the cervical canal, and effectively reduces tissue ischemia, damage, and dilation pain. The longitudinal shaping ribs are evenly distributed along the five circumferences and connect with the annular traction ribs to form a cage-like biomimetic mesh framework. This framework limits excessive axial stretching and lateral deviation of the water-filled balloon while retaining its axial flexible dilation capacity, precisely adapting to the gradual physiological process of cervical dilation. This significantly improves dilation accuracy and adaptability. A thermally conductive sealing layer, along with the inner tube and injection valve, allows for the introduction of media at different temperatures. This enables both conventional gradual cervical dilation and the use of constant-temperature media to promote cervical blood circulation and accelerate cervical softening, or low-temperature media to reduce cervical edema and alleviate pain. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure in this embodiment; Figure 2 This is an enlarged schematic diagram of the connection structure between the water injection cylinder, water bladder, and push rod in this embodiment; Figure 3 This is a partial cross-sectional view of the connecting pipe, water bladder body, and rotating sleeve in this embodiment; Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the water bladder body structure in this embodiment; Figure 6 This is a partially enlarged cross-sectional view of the connecting pipe and the sponge gasket in this embodiment; Figure 7 for Figure 6 Enlarged structural diagram at point B; Figure 8 This is a partially enlarged cross-sectional view of the water injection cylinder and sealing gasket in this embodiment; Figure 9 This is a partial cross-sectional view of the water injection cylinder, push rod, and piston plate in this embodiment; Figure 10 for Figure 9 Enlarged structural diagram at point C; Figure 11This is a partial cross-sectional view of the body and mounting base in this embodiment; Figure 12 for Figure 11 Enlarged structural diagram at point D; Figure 13 This is a partial structural diagram of the present invention. Figure 1 ; Figure 14 This is a partial structural diagram of the present invention. Figure 2 (Sectional view); Figure 15 This is a partial structural diagram of the present invention. Figure 3 .

[0020] The attached figures are labeled as follows: 1. Body; 2. Water injection cylinder; 3. Mounting base; 4. Water bladder body; 5. Connecting pipe; 6. Sponge gasket; 7. Humidity sensor; 8. Stepped structure; 9. External threaded groove; 10. Rotating sleeve; 11. Internal thread; 12. Limiting ring; 13. Rotating ring; 14. Push rod; 15. Push plate; 16. Piston plate; 17. Sealing gasket; 18. Extrusion groove; 19. Extrusion plate; 20. Square cavity; 21. Extrusion. 21. Shaft; 22. Precision spring; 23. Rotating shaft; 24. Rotation angle sensor; 25. Gear; 26. Spur rack; 27. Dial; 28. Rotating rod; 29. ​​Pointer; 30. Drive motor; 31. Indicator light; 32. Indicator; 33. Scale bar; 34. Cervical bulb; 35. Inner tube; 36. Positioning ring; 37. Longitudinal shaping rib; 38. Annular traction rib; 39. Thermally conductive sealing layer; 40. Injection valve. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. However, those skilled in the art should understand that the detailed description given herein with reference to the accompanying drawings is for better explanation. The structure of the present invention necessarily exceeds the limited embodiments described herein. Some equivalent alternatives or common means will not be described in detail herein, but still fall within the protection scope of this application.

[0022] Figures 1-15 This is the preferred embodiment of the present invention, which is described below in conjunction with the accompanying drawings. Figures 1-15 The present invention will be further described below.

[0023] A leak-proof water bladder assembly includes a water injection cylinder 2, a mounting base 3, and a water bladder body 4. A connecting pipe 5 is fixedly installed at one end of the water injection cylinder 2, and an insertion groove is provided at the end of the connecting pipe 5. One end of the water bladder body 4 is inserted into the insertion groove via a mounting unit. A seepage monitoring unit is provided on the inner wall of the insertion groove. A piston plate 16 is slidably installed inside the water injection cylinder 2. A push rod 14 is fixedly installed at one end of the piston plate 16. A spring resistance feedback unit is provided inside the push rod 14. The spring resistance feedback unit includes a compression plate 19. A compression groove 18 is jointly provided in the piston plate 16 and the push rod 14. The compression plate 19 is slidably installed in the compression groove. Inside the groove 18, a square cavity 20 is opened in the push rod 14. A squeezing shaft 21 is fixedly installed on the side of the squeezing plate 19. A precision spring 22 is sleeved on the outer wall of the squeezing shaft 21. Specifically, the precision spring 22 can be a stainless steel compression spring. After repeated tests, the spring elastic coefficient of the selected precision spring 22 matches the resistance range when injecting normal physiological saline. More specifically, every 14 kPa of pressure applied corresponds to a spring compression of 1 cm. The other end of the squeezing shaft 21 extends into the square cavity 20 and is equipped with a displacement measuring element. An indicating unit is provided on the mounting base 3. The indicating unit is electrically connected to the displacement measuring element.

[0024] like Figure 7 As shown, the installation unit includes a rotating sleeve 10. A rotating groove is provided on the outer peripheral wall of the connecting pipe 5. A limiting ring 12 is rotatably installed in the rotating groove. The outer peripheral wall of the limiting ring 12 is fixedly connected to the inner peripheral wall of the rotating sleeve 10. One end of the rotating sleeve 10 extends to the outside of the connecting pipe 5 and is connected to the water bag body 4 through a threaded connection element.

[0025] With the above structure, the position of the rotating sleeve 10 can be fixed by setting the limiting ring 12, and the rotation effect is stable and convenient to use.

[0026] like Figure 5 and Figure 6 As shown, one end of the water bladder body 4 is provided with a stepped structure 8. The outer diameter of the stepped structure 8 is the same as the inner diameter of the rotating sleeve 10. The outer wall of the stepped structure 8 is provided with an external thread groove 9, and the inner wall of the rotating sleeve 10 is provided with an internal thread 11. The internal thread 11 is threadedly connected to the external thread groove 9.

[0027] With the above structure, the connection between the internal thread 11 and the external thread groove 9 is not only convenient to operate, but also has a stable connection effect. After connection, the connection can be prevented from loosening by simply limiting the rotating sleeve 10 with your fingers.

[0028] like Figure 3 and Figure 4 As shown, a rotating ring 13 is fixedly sleeved on the outer periphery of the rotating sleeve 10, and multiple anti-slip grooves are provided on the outer periphery of the rotating ring 13.

[0029] With the above structure, by setting an anti-slip groove on the outside of the rotating ring 13, the rotating ring 13 can be more stable when rotating, avoiding slippage. Furthermore, by pinching the anti-slip groove with fingers during operation, the rotating sleeve 10 can be prevented from rotating, thus improving stability.

[0030] like Figure 6 As shown, the water seepage monitoring unit includes a humidity sensor 7. Specifically, the humidity sensor 7 is existing technology. For details, please refer to the temperature and humidity sensor disclosed in Chinese Patent No. CN156591458U, "A Smart Humidifier with Temperature and Humidity Sensor in Remote Control". The specific working principle is not described here. The inner wall of the plug slot is provided with an installation groove. The humidity sensor 7 is fixedly installed in the installation groove. A sponge gasket 6 is fixedly installed on the inner wall of the plug slot. The outer wall of the sponge gasket 6 is in contact with the humidity sensor 7. The inner wall of the sponge gasket 6 is in contact with the stepped structure 8.

[0031] With the above structure, when water seepage occurs at the connection between the connecting pipe 5 and the water bladder body 4, the sponge gasket 6 absorbs the seeping water. When the humidity sensor 7 detects that the sponge gasket 6 has become wet, it sends an electrical signal to the staff to remind them, so that the staff can check in time.

[0032] like Figure 9 and Figure 10 As shown, the displacement measuring element includes a rotating shaft 23, with both ends of the rotating shaft 23 rotatably mounted on the opposite inner walls of the square cavity 20. The inner side wall of the square cavity 20 has an equipment groove, in which a rotation angle sensor 24 is fixedly installed. Specifically, the rotation angle sensor 24 is existing technology and can be a 300-degree rotating potentiometer (such as the WH148 type). Its specific installation method and working principle will not be described in detail here. One end of the rotating shaft 23 is connected to the rotation angle sensor 24. A gear 25 is fixedly sleeved on the outer circumferential wall of the rotating shaft 23. A cross groove is opened at the end of the extrusion shaft 21, and a straight rack 26 that meshes with the gear 25 is fixedly installed on the bottom inner wall of the cross groove.

[0033] With the above structure, when the operator is filling water, the spring's elastic deformation is proportional to the resistance, and the thrust during water filling is converted into spring compression. When the precision spring 22 is compressed, the extrusion plate 19 drives the extrusion shaft 21 to move horizontally in sync. When the extrusion shaft 21 moves horizontally, it can drive the rack 26 to move horizontally, thereby driving the rotating shaft 23 to rotate through the meshing action with the gear 25. The rotation angle of the rotating shaft 23 is monitored by the rotation angle sensor 24. Specifically, after repeated experiments, it can be measured that the rotating shaft 23 rotates once when the water volume reaches 50 ml.

[0034] like Figure 11 and Figure 12 As shown, the indicating unit includes a dial 27, which is fixedly installed on the top of the mounting base 3. A rotating rod 28 is rotatably installed on the top of the mounting base 3. A pointer 29 is fixedly sleeved on the outer periphery of the rotating rod 28. An equipment cavity is opened inside the mounting base 3. A drive motor 30 is fixedly installed on the top inner wall of the equipment cavity. Specifically, the drive motor 30 can be controlled by a PLC controller. The drive motor 30 is electrically connected to a rotation angle sensor 24. Specifically, for every rotation of the rotation angle sensor 24, the drive motor 30 drives the rotating rod 28 and the pointer 29 to rotate 15 degrees. The output shaft of the drive motor 30 is connected to the end of the rotating rod 28. Multiple heat dissipation holes are evenly opened on the bottom inner wall of the equipment cavity.

[0035] With the above structure, when the rotation angle sensor 24 detects that the rotating shaft 23 is rotating, it can transmit an electrical signal to the drive motor 30, thereby driving the rotating rod 28 and the pointer 29 to rotate synchronously. For every 50 milliliters of water injected, the drive motor 30 drives the pointer 29 to rotate 15 degrees on the dial 27.

[0036] like Figure 11 As shown, the indicator unit also includes three indicator lights 31 and a prompter 32. The three indicator lights 31 and the prompter 32 are all electrically connected to the drive motor 30. The colors of the three indicator lights 31 are green, yellow and red, respectively.

[0037] In this implementation scheme, during normal water filling, the pointer 29 rotates at a constant speed with the water volume. At this time, the green indicator light in the three indicator lights 31 remains on, indicating that the staff can continue the water filling operation. When the pointer 29 continues to rotate until the water in the water bladder body 4 reaches the appropriate amount, the yellow indicator light in the indicator lights 31 lights up, indicating that the staff should stop filling. When the water bladder body 4 is ruptured or leaks, the water filling resistance will suddenly drop significantly. At this time, the precision spring 22 quickly resets, causing the pointer 29 to quickly reset as well. At this time, the drive motor 30 transmits an electrical signal to the red indicator light 31 and the prompter 32, which emit a warning sound to indicate to the staff that the water bladder body 4 is damaged.

[0038] like Figure 9 As shown, the water injection cylinder 2 is made of transparent material, specifically polypropylene. The outer wall of the water injection cylinder 2 is provided with scale strips 33, and every five scale strips 33 correspond to a water volume of 25 ml. The outer wall of the piston plate 16 is provided with an annular groove, and a sealing gasket 17 is provided in the annular groove.

[0039] In this embodiment, by making the water injection cylinder 2 transparent, the movement position of the piston plate 16 can be observed in a timely manner, thereby determining the corresponding water injection volume.

[0040] like Figures 13-15As shown, the water-filled balloon body 4 includes a cervical spherical water-filled balloon 34, an inner tube 35, a positioning rubber ring 36, a longitudinal shaping rib 37, an annular traction rib 38, a heat-conducting sealing layer 39, and an injection valve 40. It is fixedly sleeved on the outside of the water-filled balloon body 4, initially flattened and fitting snugly against the water-filled balloon body 4. The injection valve 40 is located on the outside of the water-filled balloon body 4 and communicates with the inner tube 35. The inner tube 35 is located on the inner wall of the water-filled balloon body 4 and communicates with the heat-conducting sealing layer 39. The positioning rubber ring 36 is... On the inner top wall of the cervical spherical water balloon 34, a closed flexible annular traction rib 38 is arranged in the upper, middle and lower sections of the cervical spherical water balloon 34. The annular traction rib 38 is 2mm wide and 0.8mm thick. The three sets of annular ribs are evenly distributed in parallel with an 8mm vertical spacing. The annular ribs are a closed loop structure. The purpose of this arrangement is to prevent local stress concentration, ensure that the whole structure is a standard ellipsoid after expansion, without bulges or depressions, and improve the stability of the cervical spherical water balloon 34. The longitudinal shaping ribs 37 are evenly distributed around the circumference of the water sac. The longitudinal flexible ribs are 1.5 mm wide and 0.6 mm thick. They are vertically connected to three sets of annular shaping ribs to form a cage-like bionic mesh skeleton. The length of the longitudinal ribs matches the effective expansion height of the water sac, limiting the maximum tensile deformation of the water sac, preventing excessive elongation and skewness, and ensuring the positional accuracy of the cervical spherical water sac 34. A thermally conductive sealing layer 39 is disposed on the inner bottom wall of the cervical spherical water balloon 34, wherein optionally, a liquid at a constant temperature and suitable body temperature is injected into the inner tube 35; When injecting a constant temperature medium at 37°C, the local temperature of the cervix can be increased, promoting blood circulation and accelerating cervical softening. When injecting a low temperature medium at 20°C, cervical edema can be reduced and the pain response during dilation can be decreased.

[0041] This ensures a good experience for patients with the cervical spherical water balloon 34, thereby improving the comfort of the stretched cervix and reducing user discomfort. The longitudinal shaping rib 37, the annular traction rib 38, the positioning rubber ring 36, and the heat-conducting sealing layer 39 are completely embedded inside the wall interlayer of the cervical spherical water balloon 34. They do not contact human tissue, do not protrude, and do not cause any foreign body sensation. They only limit the excessive lateral expansion, lateral displacement, and local collapse of the water balloon, while retaining the axial flexible expansion capacity. This can increase the local temperature of the cervix, promote blood circulation, accelerate cervical softening, and accurately adapt to the gradual dilation of the cervix.

[0042] A water bag delivery device includes any of the above-mentioned leak-proof water bag components: a connecting hose is installed on the main body, the other end of the connecting hose is connected to the inside of the water injection cylinder, a square groove is opened on the main body, a mounting base 3 is fixedly installed in the square groove, and three indicator lights and prompts are fixedly installed on the main body.

[0043] The working principle and usage process of this invention are as follows: During use, one end of the water bladder body 4 is inserted into the connecting pipe 5. At this time, the stepped structure 8 is aligned with the rotating sleeve 10. Rotating the rotating ring 13 drives the rotating sleeve 10 to rotate, thereby installing the water bladder body 4 through the threaded connection between the internal thread 11 and the external thread groove 9. Installation is complete when the end of the stepped structure 8 is flush with the inner wall of the insertion groove. When water leakage occurs at the connection between the connecting pipe 5 and the water bladder body 4, the sponge gasket 6 absorbs the leaked water. When the humidity sensor 7 detects that the sponge gasket 6 has become damp, it sends an electrical signal to alert the operator, allowing them to conduct a timely inspection.

[0044] After placing the water bladder body 4 in a suitable position, the staff slowly and evenly pushes the push plate 15 to inject water into the water bladder body 4. During the normal water injection process, as the water bladder gradually fills, the water injection resistance will steadily increase. Since the elastic deformation of the spring is proportional to the resistance, the spring will be gradually compressed as the resistance increases. When the precision spring 22 is compressed, it can drive the extrusion plate 19 and the extrusion shaft 21 to move synchronously. When the extrusion shaft 21 moves, it can drive the rack 26 to move horizontally, thereby driving the rotating shaft 23 to rotate through the meshing action with the gear 25. The rotation angle of the rotating shaft 23 is monitored by the rotation angle sensor 24. When the water volume reaches 50 ml, the compression of the precision spring 22 is exactly enough to drive the rotating shaft 23 to rotate one revolution.

[0045] When the rotation angle sensor 24 detects the rotation of the shaft 23, it can transmit an electrical signal to the drive motor 30, thereby driving the rotating rod 28 and the pointer 29 to rotate synchronously. For every 50 ml of water injected, the drive motor 30 drives the pointer 29 to rotate 15 degrees on the scale 27 to reach the 10 kPa position. This uniform and stable rotation of the pointer 29 indicates that the water bag is gradually expanding as expected, and the cervix is ​​also being compressed and dilated normally. Medical staff can continue to perform the water injection operation.

[0046] When abnormally high resistance is encountered during water injection, it indicates that the water volume in the water bladder body 4 has reached the threshold. At this time, the pointer 29 rotates to the appropriate position, and the drive motor 30 transmits an electrical signal to the yellow indicator light 31, prompting medical staff to stop the water injection operation when the water volume has reached the set value.

[0047] When the water bladder ruptures or leaks, the water injection resistance drops suddenly and significantly. At this time, the external force on the compressed precision spring 22 decreases, and it quickly rebounds under the elastic action of the spring 22. Through the action of the rotation angle sensor 24, the pointer 29 quickly rotates in the opposite direction to reset. When a clear rebound of the pointer 29 is observed, the drive motor 30 transmits an electrical signal to the main body 1, causing the red indicator light 31 to light up and the prompter 32 to emit a warning sound. The warning sound can be set to a relatively light and cheerful tune to avoid disturbing the pregnant woman. Medical staff can use this to determine if there is an abnormality in the water bladder body 4 during the water injection process, and the water injection operation must be stopped immediately, and the condition of the water bladder should be checked and dealt with.

[0048] In its initial state, the cervical spherical water balloon 34 is flat and completely fits the embedded cage-like skeleton, and is attached to the outer tube of the water balloon body 4. The cervical spherical water balloon 34 is smoothly implanted along the cervical canal through the outer tube of the water balloon body 4. The positioning rubber ring 36 embedded in the inner top wall of the cervical spherical water balloon 34 forms a slight support at the external os of the cervix, preventing the device from slipping out of the cervical canal or going too deep into the uterine cavity, and ensuring that the dilation position accurately corresponds to the entire cervix. The water injection cylinder 2 with a volume scale at the proximal end injects sterile saline and other media into the cervical spherical water balloon 34 through the injection valve 40 and the inner tube 35. By precisely controlling the injection volume and injection speed, the cervical canal is dilated gradually under low pressure, avoiding cervical tissue tearing or ischemic damage caused by excessively rapid injection.

[0049] The cervical spherical balloon 34, with its wall interlayer consisting of annular traction ribs 38 and longitudinal shaping ribs 37, forms a cage-like mesh framework, achieving uniform expansion. The annular traction ribs 38, with their three-segment closed-loop flexible ribs, evenly distribute the pressure within the balloon, constraining the radial expansion shape and ensuring that the balloon, once inflated, forms a standard ellipsoid, preventing local bulges and depressions and avoiding cervical ischemia caused by stress concentration. The longitudinal shaping ribs 37, with their five equally distributed longitudinal ribs vertically connected to the annular ribs, limit excessive axial stretching and skew of the balloon while maintaining axial flexibility, allowing it to slowly extend as the cervix softens, precisely adapting to the physiological process of gradual cervical dilation.

[0050] Temperature-controlled medium is injected into the heat-conducting sealing layer 39 through the inner tube 35. Temperature is transferred through the embedded heat-conducting sealing layer 39. When a constant temperature medium of 37°C is injected, the local temperature of the cervix can be increased, blood circulation can be promoted and cervical softening can be accelerated. When a low temperature medium of 20°C is injected, cervical edema can be reduced and the pain response during the dilation process can be reduced.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A leak-proof water bladder assembly, comprising a water injection cylinder (2), a mounting base (3), and a water bladder body (4), characterized in that: One end of the water injection cylinder (2) is fixedly installed with a connecting pipe (5), and the end of the connecting pipe (5) is provided with an insertion groove. One end of the water bladder body (4) is inserted into the insertion groove through an installation unit. A seepage monitoring unit is provided on the inner wall of the insertion groove. A piston plate (16) is slidably installed inside the water injection cylinder (2). A push rod (14) is fixedly installed on one end of the piston plate (16). A spring resistance feedback unit is provided inside the push rod (14). The spring resistance feedback unit includes a compression plate (19). The piston plate (16) and the... The push rod (14) has a common extrusion groove (18), the extrusion plate (19) is slidably installed in the extrusion groove (18), the push rod (14) has a square cavity (20), the side of the extrusion plate (19) is fixedly installed with an extrusion shaft (21), the outer wall of the extrusion shaft (21) is fitted with a precision spring (22), the other end of the extrusion shaft (21) extends into the square cavity (20) and is provided with a displacement measuring element, the mounting base (3) is provided with an indicator unit, and the indicator unit is electrically connected to the displacement measuring element.

2. The leak-proof water bladder assembly according to claim 1, characterized in that: The installation unit includes a rotating sleeve (10), and a rotating groove is provided on the outer peripheral wall of the connecting pipe (5). A limiting ring (12) is rotatably installed in the rotating groove. The outer peripheral wall of the limiting ring (12) is fixedly connected to the inner peripheral wall of the rotating sleeve (10). One end of the rotating sleeve (10) extends to the outside of the connecting pipe (5) and is connected to the water bag body (4) through a threaded connection element.

3. The leak-proof water bladder assembly according to claim 2, characterized in that: One end of the water bladder body (4) is provided with a stepped structure (8), the outer diameter of the stepped structure (8) is the same as the inner diameter of the rotating sleeve (10), the outer wall of the stepped structure (8) is provided with an external thread groove (9), the inner wall of the rotating sleeve (10) is provided with an internal thread (11), and the internal thread (11) is threadedly connected to the external thread groove (9).

4. The leak-proof water bladder assembly according to claim 2, characterized in that: The rotating sleeve (10) has a rotating ring (13) fixedly fitted on its outer periphery, and the outer periphery of the rotating ring (13) has multiple anti-slip grooves.

5. A leak-proof water bladder assembly according to claim 4, characterized in that: The water seepage monitoring unit includes a humidity sensor (7). The inner wall of the plug groove is provided with an installation groove. The humidity sensor (7) is fixedly installed in the installation groove. A sponge gasket (6) is fixedly installed on the inner wall of the plug groove. The outer wall of the sponge gasket (6) is in contact with the humidity sensor (7). The inner wall of the sponge gasket (6) is in contact with the stepped structure (8).

6. The leak-proof water bladder assembly according to claim 1, characterized in that: The displacement measuring element includes a rotating shaft (23), with both ends of the rotating shaft (23) rotatably mounted on the opposite inner walls of the square cavity (20). The inner side wall of the square cavity (20) is provided with an equipment groove, and a rotation angle sensor (24) is fixedly installed in the equipment groove. One end of the rotating shaft (23) is connected to the rotation angle sensor (24). A gear (25) is fixedly sleeved on the outer circumferential wall of the rotating shaft (23). A cross groove is provided at the end of the extrusion shaft (21), and a straight rack (26) that meshes with the gear (25) is fixedly installed on the bottom inner wall of the cross groove.

7. A leak-proof water bladder assembly according to claim 1, characterized in that: The indicating unit includes a dial (27), which is fixedly installed on the top of the mounting base (3). A rotating rod (28) is rotatably installed on the top of the mounting base (3). A pointer (29) is fixedly sleeved on the outer periphery of the rotating rod (28). A device cavity is opened inside the mounting base (3). A drive motor (30) is fixedly installed on the top inner wall of the device cavity. The output shaft of the drive motor (30) is connected to the end of the rotating rod (28). A plurality of heat dissipation holes are evenly opened on the bottom inner wall of the device cavity. The indicator unit also includes three indicator lights (31) and a prompter (32). The three indicator lights (31) and the prompter (32) are all electrically connected to the drive motor (30). The colors of the three indicator lights (31) are green, yellow and red, respectively.

8. A leak-proof water bladder assembly according to claim 1, characterized in that: The water-filled balloon body (4) includes a cervical spherical water-filled balloon (34), an inner tube (35), a positioning rubber ring (36), a longitudinal shaping rib (37), an annular traction rib (38), a heat-conducting sealing layer (39), and an injection hard valve (40). The cervical spherical water-filled balloon (34) is fixedly sleeved on the outside of the water-filled balloon body (4), and initially flattened and attached to the water-filled balloon body (4). The injection hard valve (40) is located on the outside of the water-filled balloon body (4) and is connected to the inner tube (35). The inner tube (35) is located on the inner wall of the water-filled balloon body (4) and is connected to the heat-conducting sealing layer (39). The positioning rubber ring (36) is located on the inner top wall of the cervical spherical water-filled balloon (34). The annular traction rib (38) is located in the upper, middle, and lower sections of the cervical spherical water-filled balloon (34), and the annular rib has a closed-loop structure. Longitudinal shaping ribs (37) are evenly distributed along the circumference of the water bladder to form a cage-like bionic mesh skeleton, which limits the maximum tensile deformation of the water bladder and prevents excessive elongation and skewness. The thermally conductive sealing layer (39) is set on the inner bottom wall of the cervical spherical water bag (34), and the longitudinal shaping rib (37), the annular traction rib (38), the positioning rubber ring (36), and the thermally conductive sealing layer (39) are completely embedded in the wall interlayer of the cervical spherical water bag (34).

9. A leak-proof water bladder assembly according to claim 1, characterized in that: The water injection cylinder (2) is made of transparent material, specifically polypropylene. The outer wall of the water injection cylinder (2) is provided with scale strips (33), and each five scale strips (33) correspond to a water volume of 25 ml. The outer wall of the piston plate (16) is provided with an annular groove, and a sealing gasket (17) is provided in the annular groove.

10. A water bag delivery device, characterized in that: Includes a body (1) and a leak-proof water bladder assembly as described in any one of claims 1-9: a connecting hose is installed on the body (1), the other end of the connecting hose is connected to the inside of the water injection cylinder (2), a square groove is provided on the body (1), the mounting base (3) is fixedly installed in the square groove, and the three indicator lights (31) and the prompter (32) are all fixedly installed on the body (1).

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