An obstetric amniotic fluid drainage device

Abstract

This invention discloses an amniotic fluid drainage device for obstetrics and gynecology, relating to the field of obstetric and gynecological instruments. It includes: a drainage tube and a puncture needle installed at the end of the drainage tube. A guide box is fitted around the outside of the puncture needle. A first support plate and a second support plate are symmetrically distributed on the outside of the guide box. Two positioning rods are fixedly installed on the outside of the guide box, and the two positioning rods are rotatably installed on the inner sides of the first and second support plates, respectively. A contact ring is installed between the first and second support plates. It also includes: a quick-release mechanism for removing the contact ring from the abdomen. The quick-release mechanism includes multiple pulleys symmetrically arranged inside the contact ring. Through this quick-release mechanism, medical tape can be attached to the pulleys. The medical tape on multiple pulleys is applied to the pregnant woman's abdomen. After drainage, the pulleys can be rotated to detach the medical tape from the skin in a rotating manner, avoiding pulling on the puncture site and thus improving the safety of the puncture drainage.

Description

Technical Field

[0001] This invention relates to the field of obstetric and gynecological instruments, specifically an amniotic fluid drainage device for obstetric use. Background Technology

[0002] In obstetrics, amniotic fluid drainage is a medical procedure to artificially drain excess amniotic fluid from the uterus to alleviate abnormal conditions in the mother and fetus. It is an intervention with clear medical indications and is not a routine delivery procedure. After local anesthesia, under real-time ultrasound guidance, a puncture needle is inserted through the abdominal wall and uterine wall into the amniotic cavity, and then connected to a drainage device to slowly and controllably release the amniotic fluid.

[0003] During abdominal amniocentesis, the area with the greatest amniotic fluid depth under ultrasound is first selected and temporarily marked on the body surface with a sterile marker. The puncture needle is then inserted into the marked location, allowing the tip of the needle to enter the amniotic cavity for drainage. To ensure the stability of the puncture insertion, existing drainage devices first attach a support plate to the pregnant woman's abdomen before inserting the puncture needle through the support plate. However, the skin on the pregnant woman's abdomen is relatively smooth, and to ensure that the support plate adheres tightly to the skin, it also needs to be fixed with medical tape. During the removal of the support plate, the puncture site will be pulled, resulting in lower safety. Summary of the Invention

[0004] The purpose of this invention is to provide an amniotic fluid drainage device for obstetrics to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An obstetric amniotic fluid drainage device includes: a drainage tube and a puncture needle installed at the end of the drainage tube. A guide box is sleeved on the outside of the puncture needle. A first support plate and a second support plate are symmetrically distributed on the outside of the guide box. Two symmetrically distributed positioning rods are fixedly installed on the outside of the guide box, and the two positioning rods are rotatably installed on the inner sides of the first support plate and the second support plate, respectively. A contact ring is fixedly installed between the first support plate and the second support plate. The device also includes: a quick-release mechanism for smoothly removing the contact ring from the abdomen. The quick-release mechanism is installed on the inner side of the contact ring and includes multiple centrally symmetrically arranged... A pulley is placed inside the contact ring, and the pulley can be attached to the skin with medical tape; a guiding mechanism is used to position and puncture the puncture needle, and the guiding mechanism is installed inside the guide box. The guiding mechanism includes two first pressure rollers and two second pressure rollers rotatably installed inside the guide box, and the first pressure rollers and second pressure rollers can provide positioning and guidance for the puncture needle; an angle adjustment mechanism is used to adjust the puncture angle of the puncture needle, and the angle adjustment mechanism is installed inside the first support plate. The angle adjustment mechanism includes a fixing ring disposed inside the first support plate, and the fixing ring can adjust the angle of the guide box.

[0006] Preferably, the quick-release mechanism further includes a rotating ring rotatably mounted inside the contact ring. The surface of the contact ring has a square hole for mounting the pulley, and the pulley is rotatably mounted inside the square hole. The outer side of the pulley has a groove for attaching medical tape. A conical wheel is fixedly mounted at one end of the pulley. A toothed ring is fixedly mounted at the bottom of the rotating ring, and the toothed ring meshes with the conical wheel. A screw is fixedly mounted at the top of the rotating ring. An arc-shaped groove is provided at the top of the contact ring for limiting the sliding of the screw. An adjusting screw is threaded onto the outer side of the screw.

[0007] Preferably, the guiding mechanism further includes a first pressure block and a second pressure block respectively disposed on both sides of the guide box. Both ends of the first and second pressure rollers are fixedly mounted with ratchet wheels. Two symmetrically distributed mounting plates are disposed on both sides inside the guide box. T-shaped rods are slidably mounted on both ends of each mounting plate. A triangular locking tooth that engages with the ratchet is mounted on the end of the T-shaped rod near the ratchet. Two symmetrically distributed first springs are fixedly mounted between the triangular locking tooth and the mounting plate. The rotation direction of the ratchet is towards the puncture needle. A first push plate is fixedly mounted between the two mounting plates located outside the first pressure roller and the first pressure block. A second push plate is fixedly mounted between the two mounting plates located outside the second pressure roller and the second pressure block. An mounting groove is provided on the outer side of the guide box for the first and second pressure blocks to slide and be limited. Two round holes are provided on the corresponding side of each of the first and second pressure blocks, and a second spring is fixedly mounted on the inner side of each round hole and the inner side of the mounting groove.

[0008] Preferably, the angle adjustment mechanism further includes a slider slidably mounted on the inner side of the first support plate, a fixing ring fixedly mounted on the outer side of the adjacent positioning rod, an insert block fixedly mounted on the top of the slider, and a plurality of centrally symmetrical slots for the insert block to be inserted into the fixing ring. The end of the insert block away from the slider has an arc-shaped structure, and the opening of the slot has a beveled structure. A third spring is fixedly mounted between the bottom of the slider and the inner side of the first support plate, a pressure rod is fixedly mounted on the outer side of the slider, and a long groove for the pressure rod to be slidably limited on the outer side of the first support plate.

[0009] Preferably, a guide ring is fixedly installed on the top of the guide box, and both the inner ring and the top of the guide ring are arc-shaped structures.

[0010] Preferably, both the first pressure roller and the second pressure roller have a raised ring on their outer sides.

[0011] Preferably, a rubber washer is fixedly installed at the bottom of the contact ring, and the cross-section of the rubber washer is arc-shaped.

[0012] Preferably, positioning ribs are fixedly installed on the outer sides of both the first push plate and the second push plate, and the positioning ribs are slidably installed on the inner side of the guide box.

[0013] Preferably, a support cylinder is slidably installed inside the circular hole of both the first pressure block and the second pressure block, and the support cylinder is fixedly installed in the mounting groove of the guide box.

[0014] Preferably, a fixing plate is fixedly installed on the side of the first support plate near the pressure rod.

[0015] The beneficial effects of this invention are: 1. This invention uses a quick-release mechanism to attach medical tape to the pulleys. By attaching the medical tape on multiple pulleys to the pregnant woman's abdomen, the contact ring can be positioned, facilitating the insertion of the puncture needle into the abdomen through the guide box. After drainage is completed, the pulleys can be rotated to detach the medical tape from the skin in a rotating manner, avoiding pulling on the puncture point and thus improving the safety of puncture and drainage.

[0016] 2. The present invention, through the guiding mechanism, enables the two first pressure rollers and the two second pressure rollers to press against the outside of the puncture needle when the puncture needle is inserted into the guide box. The triangular retaining teeth and the ratchet are used to prevent the puncture needle from being pulled out upwards, thus preventing the elasticity of the skin from causing the puncture needle to bounce upwards, thereby improving the stability of the puncture needle during puncture.

[0017] 3. The present invention uses an angle adjustment mechanism to pull the insert block out of the current slot, thereby unlocking the positioning rod. This allows medical personnel to rotate the guide box to adjust its angle. The insert block is then inserted into the slot of the fixing ring to lock the fixing ring. The positioning rod then locks the guide box, thereby adjusting the angle of the guide box for multi-angle use of the puncture needle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional view of the guide box and the first pressure roller in this invention. Figure 3 This is a partial cross-sectional view of the first and second pressure plates in this invention. Figure 4 This is a schematic diagram of the ratchet and triangular tooth structure in this invention; Figure 5 for Figure 4 Enlarged structural diagram of area A in the middle; Figure 6 This is a schematic diagram of a partial cross-sectional structure of the contact ring and pulley in this invention; Figure 7 This is a schematic diagram of a partial cross-sectional structure of the rotating ring and screw in this invention; Figure 8 This is a partial cross-sectional structural diagram of the insert block and fixing ring in this invention.

[0019] In the diagram: 1. Drainage tube; 2. Puncture needle; 3. Guide box; 4. First support plate; 5. Second support plate; 6. Positioning rod; 7. Contact ring; 8. Pulley; 9. First pressure roller; 10. Second pressure roller; 11. Fixing ring; 12. Rotary ring; 13. Conical wheel; 14. Toothed ring; 15. Screw; 16. Adjusting screw; 17. First pressure block; 18. Second pressure block; 19. Ratchet; 20. Mounting plate; 21. T-shaped rod; 22. Triangular retaining tooth; 23. First spring; 24. First push plate; 25. Second push plate; 26. Second spring; 27. Slider; 28. Insert block; 29. ​​Third spring; 30. Pressure rod; 31. Guide ring; 32. Convex ring; 33. Rubber washer; 34. Positioning rib; 35. Support cylinder; 36. Fixing plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1-8 The diagram shows an amniotic fluid drainage device for obstetrics, including a drainage tube 1 and a puncture needle 2 installed at the end of the drainage tube 1. A guide box 3 is sleeved on the outside of the puncture needle 2. A first support plate 4 and a second support plate 5 are symmetrically distributed on the outside of the guide box 3. Two positioning rods 6 are fixedly installed on the outside of the guide box 3, and the two positioning rods 6 are respectively rotatably installed on the inside of the first support plate 4 and the second support plate 5. A contact ring 7 is fixedly installed between the first support plate 4 and the second support plate 5. The contact ring 7 is placed on the abdomen of the pregnant woman, so that the middle position of the guide box 3 is aligned with the body surface mark on the abdomen. The puncture needle 2 is inserted into the abdomen of the pregnant woman through the guide box 3, and then the amniotic fluid in the amniotic cavity is drained through the drainage tube 1. The quick-release mechanism includes multiple pulleys 8 arranged symmetrically inside the contact ring 7. The pulleys 8 can be applied to the skin using medical tape. The quick-release mechanism also includes a rotating ring 12 rotatably mounted inside the contact ring 7. The surface of the contact ring 7 has square holes for mounting the pulleys 8, and the pulleys 8 are rotatably mounted inside these square holes. The outer side of the pulleys 8 has grooves for attaching medical tape, allowing medical personnel to apply the tape to these grooves. A conical wheel 13 is fixedly mounted at one end of each pulley 8, and a toothed ring 14 is fixedly mounted at the bottom of the rotating ring 12. The toothed ring 14 meshes with the conical wheel 13. When the rotating ring 12 is rotated, the toothed ring 14 drives the conical wheel 13 to rotate, which in turn drives the pulley 8 to rotate. This causes the pulley 8 to bring the medical tape downwards, allowing medical personnel to apply the medical tape on the pulley 8 to the pregnant woman's abdomen. After drainage is completed, rotating the rotating ring 12 in the opposite direction causes the rotating ring 12 to rotate and reset the pulley 8 via the toothed ring 14 and the conical wheel 13, pulling the medical tape off the skin and avoiding pulling on the puncture site, thus increasing safety. A screw 15 is fixedly installed at the top of the rotating ring 12. The top of the contact ring 7 has an arc-shaped groove for the screw 15 to slide and limit its movement. An adjusting screw cylinder 16 is threaded onto the outer side of the screw 15. The adjusting screw cylinder 16 can pull the screw 15 to move, causing the screw 15 to drive the rotating ring 12 to rotate. After adjustment, rotating the adjusting screw cylinder 16 causes it to rotate downwards along the outer side of the screw 15 and contact the top of the contact ring 7, tightening the adjusting screw cylinder 16 and thus positioning the rotating ring 12, ensuring the angle of the pulley 8. A guide ring 31 is fixedly installed on the top of the guide box 3. The inner ring and top of the guide ring 31 are both arc-shaped, which makes it easy for medical personnel to insert the puncture needle 2 into the inner side of the guide box 3. The outer sides of the first pressure roller 9 and the second pressure roller 10 are both provided with protruding rings 32, so that the first pressure roller 9 and the second pressure roller 10 abut against the outer side of the puncture needle 2 through the protruding rings 32, so as to prevent the puncture needle 2 from shifting position. The bottom of the contact ring 7 is fixedly installed with a rubber gasket 33, and the cross-section of the rubber gasket 33 is arc-shaped. The contact ring 7 can abut against the skin of the abdomen through the rubber gasket 33, so as to prevent the contact ring 7 from directly contacting the skin.

[0022] Example 2: Please refer to Figures 2-5This embodiment further illustrates Example 1. The guiding mechanism shown in the figure includes two first pressure rollers 9 and two second pressure rollers 10 rotatably mounted inside the guide box 3. The first pressure rollers 9 and second pressure rollers 10 can provide positioning and guidance for the puncture needle 2. The guiding mechanism also includes a first pressure block 17 and a second pressure block 18 respectively disposed on both sides of the guide box 3. Both ends of the first pressure rollers 9 and second pressure rollers 10 are fixedly mounted with ratchet wheels 19. Both sides inside the guide box 3 are provided with two symmetrically distributed mounting plates 20. Both ends of the mounting plates 20 are slidably mounted with T-shaped rods 21. The end of the T-shaped rod 21 near the ratchet wheel 19 is equipped with a triangular locking tooth 22 that cooperates with the ratchet wheel 19. Two symmetrically distributed locking teeth 22 are fixedly mounted between the triangular locking teeth 22 and the mounting plates 20. The first spring 23, using its elasticity, allows the triangular locking teeth 22 to lock the ratchet 19 in one direction. The ratchet 19 rotates towards the puncture needle 2. When the puncture needle 2 is inserted into the guide box 3, it contacts the two first pressure rollers 9 and the two second pressure rollers 10, causing them to rotate towards the puncture needle 2. The triangular locking teeth 22, in conjunction with the ratchet 19, prevent the ratchet 19 from rotating in the opposite direction, thus preventing the first and second pressure rollers 9 and 10 from rotating in the opposite direction. This avoids the puncture needle 2 from reverting upwards due to the skin's elasticity when it pierces the pregnant woman's abdomen, ensuring the puncture needle 2 can smoothly penetrate the pregnant woman's abdomen. The two mounting plates 20 located outside the first pressure roller 9 and the first pressure block 1... A first push plate 24 is fixedly installed between the two mounting plates 20 located outside the second pressure roller 10 and the second pressure block 18. A second push plate 25 is fixedly installed between the two mounting plates 20 located outside the second pressure roller 10 and the second pressure block 18. The outer side of the guide box 3 is provided with a mounting groove for the first pressure block 17 and the second pressure block 18 to slide in a limited manner. Two round holes are opened on the corresponding side of the first pressure block 17 and the second pressure block 18, and a second spring 26 is fixedly installed on the inner side of the round hole and the inner side of the mounting groove. When the first pressure block 17 and the second pressure block 18 are pressed at the same time, the first pressure block 17 can drive the corresponding mounting plate 20 to move through the first push plate 24, and the second pressure block 18 can drive the corresponding mounting plate 20 to move through the second push plate 25. The mounting plate 20 pulls the triangular tooth 22 away from the ratchet 19 through the T-shaped rod 21, thereby realizing the ratchet. Unlocking 19 unlocks the first pressure roller 9 and the second pressure roller 10, facilitating the removal of the puncture needle 2 from between them. When the first pressure block 17 and the second pressure block 18 are released, the elasticity of the second spring 26 allows the first pressure block 17 and the second pressure block 18 to reset. Positioning ribs 34 are fixedly installed on the outer sides of both the first push plate 24 and the second push plate 25, and these ribs 34 are slidably installed on the inner side of the guide box 3, providing positioning for the first push plate 24 and the second push plate 25 and improving the smoothness of their movement. Support cylinders 35 are slidably installed on the inner sides of the round holes of both the first pressure block 17 and the second pressure block 18, and these support cylinders 35 are fixedly installed in the mounting grooves of the guide box 3.The support cylinder 35 provides support for the first pressure block 17 and the second pressure block 18.

[0023] Example 3: Please refer to Figures 1-8 This embodiment further illustrates other embodiments. The angle adjustment mechanism shown in the figure includes a fixing ring 11 disposed inside the first support plate 4. The fixing ring 11 can adjust the angle of the guide box 3. The angle adjustment mechanism also includes a slider 27 slidably installed inside the first support plate 4. The fixing ring 11 is fixedly installed on the outside of the adjacent positioning rod 6. An insert block 28 is fixedly installed on the top of the slider 27. Multiple centrally symmetrical slots for the insert block 28 to be inserted are opened on the outside of the fixing ring 11. The end of the insert block 28 away from the slider 27 has an arc-shaped structure, and the opening of the slot has a beveled structure. A third spring 29 is fixedly installed between the bottom of the slider 27 and the inside of the first support plate 4, pushing the slider 27 to move along the inside of the first support plate 4, so that the insert block 28 is pulled out from the current slot. Unlocking the positioning rod 6 allows medical personnel to rotate the guide box 3, facilitating angle adjustment. When the slider 27 is released, the rebound force of the third spring 29 pushes the slider 27 upward to reset, causing the slider 27 to push the insert block 28 into the slot of the fixing ring 11, thus locking the fixing ring 11. The positioning rod 6 then locks the guide box 3. A pressure rod 30 is fixedly installed on the outside of the slider 27, and a long groove for the pressure rod 30 to slide is provided on the outside of the first support plate 4, allowing the slider 27 to move via the pressure rod 30. A fixing plate 36 is fixedly installed on the side of the first support plate 4 near the pressure rod 30, allowing medical personnel to press their thumb on the bottom of the fixing plate 36 and then press the pressure rod 30 with their index finger, improving the convenience of pressing the pressure rod 30.

[0024] Working principle: First, medical personnel attach medical tape to the groove of pulley 8 and place contact ring 7 on the pregnant woman's abdomen, so that the medical tape at the bottom of pulley 8 adheres to the skin, thus fixing contact ring 7. Then, the medical personnel press their thumb on the bottom of fixing plate 36 and press the pressure rod 30 with their index finger. The pressure rod 30 drives slider 27 to move along the inner side of the first support plate 4, compressing the third spring 29. Slider 27 drives insert block 28 to move synchronously, causing insert block 28 to be pulled out of the current slot on fixing ring 11. Then, the medical personnel rotate guide box 3 to align guide box 3 with the body surface mark on the abdomen. At this time, the medical personnel release pressure rod 30, and the rebound force of the third spring 29 pushes slider 27 upward to reset, causing slider 27 to push insert block 28 into the slot of fixing ring 11, locking fixing ring 11, and thus... Positioning rod 6 locks the guide box 3. Then, medical personnel insert the puncture needle 2 into the guide box 3, allowing the puncture needle 2 to move between the two first pressure rollers 9 and the two second pressure rollers 10. The puncture needle 2 can drive the first pressure rollers 9 and the second pressure rollers 10 to rotate, causing the first pressure rollers 9 and the second pressure rollers 10 to drive the ratchet 19 to rotate. By utilizing the cooperation between the triangular locking teeth 22 and the ratchet 19, the ratchet 19 cannot rotate in the opposite direction, and the first pressure rollers 9 and the second pressure rollers 10 cannot rotate in the opposite direction. This avoids the problem of the puncture needle 2 returning to its original position due to the elasticity of the skin when it is inserted into the pregnant woman's abdomen. It ensures that the puncture needle 2 can be inserted into the pregnant woman's abdomen smoothly. When the puncture needle 2 enters the amniotic cavity, medical personnel can drain the amniotic fluid in the amniotic cavity through the drainage tube 1, thereby achieving a smooth puncture effect and improving the convenience of puncture and drainage. After drainage is completed, medical staff first rotate the adjusting screw 16, causing it to rotate upwards along the outer side of the screw 15. Then, the adjusting screw 16 pulls the screw 15 along the arc-shaped groove on the contact ring 7. The screw 15 drives the rotating ring 12 to rotate, which in turn drives the toothed ring 14 to rotate synchronously. The toothed ring 14 drives the conical wheel 13 at the end of the pulley 8 to rotate, which in turn drives the pulley 8 to rotate. The pulley 8 pulls out the medical tape, keeping it away from the pregnant woman's abdominal skin to avoid pulling on the puncture site. Then, the medical staff presses the first pressure point. Block 17 and the second pressing block 18. The first pressing block 17 drives the corresponding two mounting plates 20 to move through the first push plate 24. At the same time, the second pressing block 18 drives the corresponding mounting plate 20 to move through the second push plate 25. The mounting plate 20 pulls the triangular locking tooth 22 to move through the T-shaped rod 21, so that the triangular locking tooth 22 moves away from the ratchet 19. The ratchet 19 unlocks the first pressing wheel 9 and the second pressing wheel 10. Medical personnel can then pull the guide box 3 and the contact ring 7 away from the pregnant woman's abdomen and then remove the puncture needle 2 from the pregnant woman's abdomen, thereby improving the safety of puncture and drainage.

[0025] 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 process, method, article, or apparatus.

[0026] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An obstetric amniotic fluid drainage device, characterized in that, include: A drainage tube (1) and a puncture needle (2) installed at the end of the drainage tube (1). A guide box (3) is sleeved on the outside of the puncture needle (2). A first support plate (4) and a second support plate (5) are symmetrically distributed on the outside of the guide box (3). Two positioning rods (6) are fixedly installed on the outside of the guide box (3). The two positioning rods (6) are rotatably installed on the inside of the first support plate (4) and the second support plate (5). A contact ring (7) is installed between the first support plate (4) and the second support plate (5). Also includes: A quick-release mechanism is used to remove the contact ring (7) from the abdomen. The quick-release mechanism is installed on the inner side of the contact ring (7). The quick-release mechanism includes a plurality of pulleys (8) arranged symmetrically on the inner side of the contact ring (7). The pulleys (8) can be attached to the skin with medical tape. A guiding mechanism is used to position and puncture the puncture needle (2). The guiding mechanism is installed inside the guide box (3). The guiding mechanism includes two first pressure rollers (9) and two second pressure rollers (10) rotatably installed inside the guide box (3). The first pressure rollers (9) and the second pressure rollers (10) can provide positioning and guidance for the puncture needle (2). An angle adjustment mechanism is used to adjust the puncture angle of the puncture needle (2). The angle adjustment mechanism is installed on the inner side of the first support plate (4). The angle adjustment mechanism includes a fixing ring (11) disposed on the inner side of the first support plate (4). The fixing ring (11) can adjust the angle of the guide box (3).

2. An obstetric amniotic fluid drainage device according to claim 1, characterized in that: The quick-release mechanism also includes a rotating ring (12) rotatably mounted inside the contact ring (7). The surface of the contact ring (7) is provided with a square hole for mounting the pulley (8), and the pulley (8) is rotatably mounted inside the square hole. The outer side of the pulley (8) is provided with a groove for attaching medical tape. One end of the pulley (8) is provided with a conical wheel (13). The bottom of the rotating ring (12) is provided with a toothed ring (14), and the toothed ring (14) meshes with the conical wheel (13). The top of the rotating ring (12) is provided with a screw (15). The top of the contact ring (7) is provided with an arc-shaped groove for limiting the sliding of the screw (15). The outer thread of the screw (15) is threaded with an adjusting screw (16).

3. The amniotic fluid drainage device for obstetrics according to claim 2, characterized in that: The guiding mechanism further includes a first pressure block (17) and a second pressure block (18) respectively disposed on both sides of the guide box (3). Both ends of the first pressure wheel (9) and the second pressure wheel (10) are equipped with ratchet wheels (19). Two mounting plates (20) are disposed on both sides inside the guide box (3). T-shaped rods (21) are slidably mounted on both ends of the mounting plates (20). A triangular locking tooth (22) that cooperates with the ratchet wheel (19) is mounted on one end of the T-shaped rod (21) near the ratchet wheel (19). Two first springs (23) are installed between the triangular locking tooth (22) and the mounting plate (20), and the rotation of the ratchet wheel (19)... The moving direction is towards the puncture needle (2). A first push plate (24) is installed between the two mounting plates (20) located outside the first pressure roller (9) and the first pressure block (17). A second push plate (25) is installed between the two mounting plates (20) located outside the second pressure roller (10) and the second pressure block (18). The guide box (3) has an installation groove on its outer side for limiting the sliding of the first pressure block (17) and the second pressure block (18). Two round holes are opened on the corresponding side of the first pressure block (17) and the second pressure block (18), and a second spring (26) is installed on the inner side of the round hole and the inner side of the installation groove.

4. The amniotic fluid drainage device for obstetrics according to claim 3, characterized in that: The angle adjustment mechanism also includes a slider (27) slidably installed on the inner side of the first support plate (4), a fixing ring (11) installed on the outer side of the adjacent positioning rod (6), a plug (28) installed on the top of the slider (27), a plurality of centrally symmetrical slots for the plug (28) to be inserted into the fixing ring (11), one end of the plug (28) is arc-shaped, and the opening of the slot is inclined, a third spring (29) is installed between the bottom of the slider (27) and the inner side of the first support plate (4), a pressure rod (30) is installed on the outer side of the slider (27), and a long groove for the pressure rod (30) to be slidably moved is opened on the outer side of the first support plate (4).

5. The amniotic fluid drainage device for obstetrics according to claim 1, characterized in that: The top of the guide box (3) is equipped with a guide ring (31), and the inner ring and the top of the guide ring (31) are both arc-shaped structures.

6. The amniotic fluid drainage device for obstetrics according to claim 2, characterized in that: Both the first pressure roller (9) and the second pressure roller (10) have a raised ring (32) on their outer sides.

7. The amniotic fluid drainage device for obstetrics according to claim 2, characterized in that: A rubber washer (33) is installed at the bottom of the contact ring (7), and the cross-section of the rubber washer (33) is arc-shaped.

8. The amniotic fluid drainage device for obstetrics according to claim 3, characterized in that: The first push plate (24) and the second push plate (25) are both equipped with positioning ribs (34) on their outer sides, and the positioning ribs (34) are slidably installed on the inner side of the guide box (3).

9. The amniotic fluid drainage device for obstetrics according to claim 3, characterized in that: The first pressure block (17) and the second pressure block (18) are both slidably fitted with support cylinders (35) inside their round holes, and the support cylinders (35) are installed in the mounting groove of the guide box (3).

10. The amniotic fluid drainage device for obstetrics according to claim 4, characterized in that: A fixing plate (36) is installed on one side of the first support plate (4).

Images