An obstetric amniotic fluid drainage device
Patent Information
- Application Number
- CN202511351489.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2026-10-13
AI Technical Summary
[0004]而通过手指被动封堵的方式，在实际操作时羊水的流速波动范围波动大(理想流速应控制在200～300ml/min)，无法准确控制，进而会增加脐带脱垂风险
[0016]本技术方案中可对羊水在单位时间内的流量进行控制，进而就能起到控制羊水排放速度的效果，进而避免羊水快速流出，导致脐带脱垂的问题。
Smart Images
Figure CN122894571A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of drainage devices, specifically relating to an amniotic fluid drainage device for obstetrics. Background Technology
[0002] Artificial rupture of membranes, also known as "artificial water breaking," occurs when the amniotic sac disappears, allowing the fetal head to directly contact and compress the cervix. This stimulates the nerve plexus surrounding the cervix, reflexively strengthening the pacemaker of uterine contractions. It also increases the secretion of posterior pituitary hormones, leading to a corresponding increase in oxytocin release. This enhances the responsiveness of the uterine muscles to oxytocin, further strengthening the intensity of uterine contractions and promoting the delivery process.
[0003] The current method of artificial rupture of membranes usually involves medical staff inserting their fingers into the dilated cervix to touch the anterior amniotic sac; under the guidance of the fingers, placing toothed forceps / clamps on the surface of the amniotic sac; during the interval between contractions, bluntly puncturing the amniotic sac with the tips of the forceps (clamps) to allow the amniotic fluid to flow out slowly; the examining fingers are temporarily "blocked" in the vagina to prevent the amniotic fluid from flowing out too quickly, which could lead to problems such as umbilical cord prolapse.
[0004] However, when using a finger to passively block the flow of amniotic fluid, the flow rate fluctuates greatly during the actual operation (the ideal flow rate should be controlled at 200-300 ml / min), making it impossible to control accurately and thus increasing the risk of umbilical cord prolapse. Summary of the Invention
[0005] In view of this, the purpose of the present invention is to provide an obstetric amniotic fluid drainage device to improve the flow rate control effect during amniotic fluid drainage and reduce the risk of umbilical cord prolapse.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] This invention discloses an amniotic fluid drainage device for obstetrics, comprising an external conduit with an internal mounting block. The mounting block includes a front mounting block, a middle mounting block, and a rear mounting block arranged sequentially. The outer surface of the middle mounting block is sealed to the inner wall of the external conduit. The front mounting block has a conical hole inside, with its small-diameter end near the middle mounting block and its large-diameter end communicating with the outer end of the front mounting block. The rear mounting block has a through mounting groove communicating with the interior of the conical hole. The hole has a conical block inside, the height of which is less than the height of the conical hole. The rear mounting block has a fixing ring inside, and the middle of the fixing ring has a connecting hole. A compression spring is provided between the fixing ring and the small diameter end of the conical block. The two ends of the compression spring are respectively fixed to the small diameter end of the conical block and the fixing ring. A traction rope is provided on the small diameter end of the conical block. One end of the traction rope is fixed to the conical block, and the other end of the traction rope passes through the connecting hole and the mounting groove, and extends to the outside of the end of the external conduit, and is detachably connected to the surface of the external conduit.
[0008] During drainage, a tension is applied to the traction rope under the reset action of the compression spring. The length of the traction rope moving into the external catheter is manually controlled, and the movement distance of the control cone block within the cone hole is controlled, thereby controlling the size of the gap formed between the cone block and the cone hole, and thus controlling the flow rate of amniotic fluid discharged outward.
[0009] Furthermore, an installation gap is provided between the front-end mounting block and the external conduit. A plurality of first airways are provided circumferentially on the middle mounting block located within the installation gap. A first annular cavity is provided on the outer side of the first airways. The first annular cavity is fixed on the middle mounting block. The interior of the first annular cavity communicates with the ends of the plurality of first airways. A first trachea is provided on the side of the first annular cavity. One end of the first trachea communicates with the interior of the first annular cavity. The other end of the first trachea extends to the outer side of the end of the external conduit. The large-diameter end of the front-end mounting block is located inside the end of the external conduit. A membrane-breaking cone is provided on the large-diameter end of the conical block. The membrane-breaking cone is fixed on the conical block. The limit movement position of the membrane-breaking cone is located between the end of the external conduit and the end of the front-end mounting block.
[0010] Furthermore, the end of the front mounting block is provided with an annular groove, and an annular airbag is provided in the annular groove. The inner ring of the annular airbag is fixed in the annular groove. The inner circumference of the wall thickness of the front mounting block is provided with a plurality of second air passages. One end of the plurality of second air passages is connected to the annular airbag. The other end of the second air passage is provided with a second annular cavity. The second annular cavity is fixed on the middle mounting block. The interior of the second annular cavity is connected to the other end of the plurality of second air passages. A second air tube is provided on the side of the second annular cavity. One end of the second air tube is connected to the interior of the second annular cavity. The other end of the second air tube extends to the outer side of the end of the external conduit.
[0011] Furthermore, a third air tube is provided at the end of the rear mounting tube, one end of the third air tube is connected to the rear mounting tube, and the other end of the third air tube extends to the outside of the end of the external conduit.
[0012] Furthermore, a rubber sealing layer is provided on the outer surface of the central mounting block, and the rubber sealing layer slides in contact with the inner wall of the external conduit.
[0013] Furthermore, a retaining ring is provided on the inner wall of the external conduit, and the outer ring of the retaining ring is fixed to the inner wall of the external conduit. The retaining ring is used to restrict the installation position of the central mounting block inside the external conduit.
[0014] Furthermore, the end of the external catheter that contacts the amniotic sac has a rounded chamfer.
[0015] The beneficial effects of this invention are as follows:
[0016] This technical solution can control the flow rate of amniotic fluid per unit time, thereby controlling the rate of amniotic fluid discharge and preventing rapid outflow of amniotic fluid, which could lead to umbilical cord prolapse.
[0017] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description
[0018] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:
[0019] Figure 1 This is a schematic diagram of the front view and cross-sectional view of the drainage device of the present invention;
[0020] Figure 2 This is a three-dimensional schematic diagram of the internal components of the drainage device of the present invention;
[0021] Figure 3 This is a three-dimensional schematic diagram of the mounting block in the drainage device of the present invention;
[0022] Figure 4 This is a schematic cross-sectional view of the mounting block in the drainage device of the present invention;
[0023] Figure 5 This is a three-dimensional schematic diagram of the conical block and compression spring, etc., in the drainage device of the present invention;
[0024] Figure 6 This is a schematic cross-sectional view of the conical block and compression spring components in the drainage device of the present invention.
[0025] The following labels are shown in the attached diagram:
[0026] 1. External catheter; 2. Amniotic sac; 3. Amniotic fluid; 4. Front mounting block; 5. Rear mounting block; 6. Conical groove; 7. Mounting groove; 8. Middle mounting block; 9. Annular airbag; 10. First airway; 11. Second airway; 12. Conical block; 13. Membrane rupture cone; 14. Compression spring; 15. Traction rope; 16. First annular cavity; 17. Second annular cavity; 18. First trachea; 19. Second trachea; 20. Fixing ring; 21. Connecting hole. Detailed Implementation
[0027] like Figures 1-6 As shown, an amniotic fluid drainage device for obstetrics includes an external conduit 1. The external conduit 1 has an internal mounting block, which includes a front mounting block 4, a middle mounting block 8, and a rear mounting block 5 arranged sequentially (all three are integrally molded). The outer surface of the middle mounting block 8 is sealed to the inner wall of the external conduit 1. The front mounting block 4 has a conical hole inside, with the small-diameter end of the conical hole located near the middle mounting block 8, and the large-diameter end of the conical hole communicating with the outer end of the front mounting block 4. The rear mounting block 5 has a through mounting groove 7, which communicates with the interior of the conical hole. (In this specific embodiment, the front mounting block 4 also has a guide hole that connects the mounting groove 7 and the conical hole.) 20 can be set in either the guide hole or the connecting hole 21. The tapered hole has a tapered block 12 inside, and the height of the tapered block 12 is less than the height of the tapered hole. The rear mounting block 5 has a fixing ring 20 inside, and the middle of the fixing ring 20 has a connecting hole 21. A compression spring 14 is provided between the fixing ring 20 and the small diameter end of the tapered block 12. The two ends of the compression spring 14 are respectively fixed to the small diameter end of the tapered block 12 and the fixing ring 20. A traction rope 15 is provided on the small diameter end of the tapered block 12. One end of the traction rope 15 is fixed to the tapered block 12, and the other end of the traction rope 15 passes through the connecting hole 21 and the mounting groove 7 and extends to the outer side of the end of the external conduit 1, and can be detachably connected to the surface of the external conduit 1.
[0028] During drainage, under the reset action of the compression spring 14, a tension is applied to the traction rope 15. The length of the traction rope 15 moving into the external catheter 1 is manually controlled, and the movement distance of the control cone block 12 in the cone hole is controlled, thereby controlling the size of the gap formed between the cone block 12 and the cone hole, and thus controlling the flow rate of amniotic fluid 3 discharged outward.
[0029] The working principle of the above technical solution is as follows:
[0030] First, the amniotic sac 2 is ruptured using tools such as cervical forceps. Then, the device is inserted into the cervix through the vagina, and the end of the external catheter 1 is brought into contact with the rupture. The amniotic fluid 3 is then drained into the external catheter 1. By controlling the distance that the traction rope 15 moves into the external catheter 1, the distance that the compression spring 14 pushes the conical block 12 outward can be controlled. This creates a gap between the conical block 12 and the conical groove 6, which serves as the outflow channel for the amniotic fluid 3 (gap - installation groove 7 - external catheter 1 - outside). By controlling the distance that the traction rope 15 enters the external catheter 1, the size of the gap can be controlled, thereby controlling the flow rate of the amniotic fluid 3 per unit time. This effectively controls the rate at which the amniotic fluid 3 is discharged, thus preventing the rapid outflow of amniotic fluid 3 and avoiding umbilical cord prolapse.
[0031] Preferably, in order to precisely control the distance of the traction rope 15 into the external conduit 1, a control component can be set on the end of the external conduit 1 that is located outside the conduit. For example, a clamp can be set on the traction rope 15, the diameter of which is larger than the diameter of the external conduit 1, and the traction rope 15 can be provided with a size scale (the size scale indicates the amount of amniotic fluid discharged per minute under the current gap). That is, by adjusting the position of the clamp, the length of the traction rope 15 entering the external conduit 1 can be precisely controlled, thereby precisely controlling the speed of amniotic fluid discharge.
[0032] In one feasible embodiment, an installation gap is provided between the front mounting block 4 and the external conduit 1. A plurality of first airways 10 are provided circumferentially on the middle mounting block 8 located within the installation gap. A first annular cavity 16 is provided on the outer side of the first airway 10. The first annular cavity 16 is fixed on the middle mounting block 8. The interior of the first annular cavity 16 communicates with the ends of the plurality of first airways 10. A first trachea 18 is provided on the side of the first annular cavity 16. One end of the first trachea 18 communicates with the interior of the first annular cavity 16. The other end of the first trachea 18 extends to the outer side of the end of the external conduit 1. The large-diameter end of the front mounting block 4 is located inside the end of the external conduit. A membrane-breaking cone 13 is provided on the large-diameter end of the conical block 12. The membrane-breaking cone 13 is fixed on the conical block 12. The limit movement position of the membrane-breaking cone 13 is located between the end of the external conduit 1 and the end of the front mounting block 4.
[0033] The working principle of the above technical solution is as follows:
[0034] A suction assembly (existing technology) is provided at the end of the first trachea 18. The suction assembly draws suction into the first annular cavity 16 through the first trachea 18, creating a negative pressure within the first annular cavity 16. This causes the ends of several first airways 10 to also be in a state of negative pressure suction. Specifically, when the end of the external conduit 1 contacts the amniotic sac 2, and because the amniotic sac 2 is thin, soft, and elastic, it will be drawn into the installation gap between the front mounting block 4 and the external conduit 1 under the action of negative pressure. Figure 1 As shown, part of the amniotic sac 2 is located outside the front mounting block 4 and is in a taut state. Therefore, at this time, it is only necessary to loosen the traction rope 15. Under the action of the compression spring 14, the membrane rupture cone 13 will move forward to rupture the amniotic sac 2 outside the front mounting block 4. After rupture, the gap between the cone block 12 and the cone groove 6 can be controlled, thereby controlling the discharge speed of the amniotic fluid 3. Therefore, in this way, the rupture operation of the amniotic sac 2 can be achieved by this device. At the same time, since the limit movement position of the membrane rupture cone 13 is located inside the end of the external catheter 1, and under the blocking effect of the end of the external catheter 1, the local tissue of the fetus inside the amniotic sac 2 will not be sucked into the external catheter 1. Therefore, when the amniotic sac 2 is sucked into the external catheter 1, the internal fetus will not be harmed when the membrane rupture cone 13 is used to rupture it, making it safer to use (of course, before rupture, it is necessary to confirm the position of the fetus and avoid contact between the fetus's fingers and other small tissues and the external catheter 1, and further avoid being sucked into the external catheter 1). At the same time, this method combines the membrane rupture operation with amniotic fluid drainage to further improve the drainage effect (if, as in the existing technology, the membrane is ruptured first using cervical forceps, and then the cervical forceps are removed and the drainage device is inserted, a large amount of amniotic fluid will flow out during the removal of the cervical forceps, which may easily lead to umbilical cord prolapse).
[0035] In one feasible embodiment, an annular groove is provided on the end of the front mounting block 4, and an annular airbag 9 is provided in the annular groove. The inner ring of the annular airbag 9 is fixed in the annular groove. A plurality of second air passages 11 are provided on the inner circumference of the wall thickness of the front mounting block 4. One end of the plurality of second air passages 11 is connected to the annular airbag 9. A second annular cavity 17 is provided on the outer side of the other end of the second air passages 11. The second annular cavity 17 is fixed on the middle mounting block 8. The interior of the second annular cavity 17 is connected to the other end of the plurality of second air passages 11. A second air tube 19 is provided on the side of the second annular cavity 17. One end of the second air tube 19 is connected to the interior of the second annular cavity 17. The other end of the second air tube 19 extends to the outer side of the end of the external conduit 1.
[0036] The working principle of the above technical solution is as follows:
[0037] When the first trachea 18 generates negative pressure to draw the amniotic sac 2 into the installation gap between the front cone block 12 and the external catheter 1, only air needs to be supplied to the second trachea 19 to inflate the annular airbag 9, thereby squeezing the amniotic sac 2 against the inner wall of the external catheter 1. This prevents the amniotic sac 2 from detaching from the installation gap after rupture due to decreased negative pressure absorption and its own elastic contraction, which would cause amniotic fluid 3 to flow out from the end of the installation tube and then from the contact gap between the installation tube and the vagina, making it impossible to accurately control the drainage of this leaked amniotic fluid 3. It is easy to understand that through the pressurization of the annular airbag 9, the amniotic sac 2 will not detach from the installation gap and will play a sealing role, keeping the rupture point of the amniotic sac 2 always inside the external catheter 1. This ensures that most of the amniotic fluid 3 can only be discharged outward through the inside of the catheter, thus allowing for more precise drainage control of the amniotic fluid 3 drainage rate. Furthermore, under the pressure sealing effect of the annular airbag 9, the negative pressure suction effect of the first trachea 18 can be closed, preventing excessive suction of amniotic fluid 3 from the first trachea 18 due to negative pressure, which would lead to poor performance.
[0038] In one feasible embodiment, a third trachea is provided at the end of the rear installation tube. One end of the third trachea is connected to the rear installation tube, and the other end of the third trachea extends to the outside of the end of the external conduit 1. The third trachea further controls the drainage speed of the amniotic fluid 3 by suction. Of course, the first traction rope 15 is located inside the third trachea, and then the end of the third trachea can be filled with the wall thickness of the third trachea and pass through. The diameter of the through hole is small and will not have too much impact on the negative pressure suction effect, that is, the impact is negligible.
[0039] In one feasible embodiment, a rubber sealing layer is provided on the outer surface of the central mounting block 8. The rubber sealing layer slides in contact with the inner wall of the external conduit 1, which can be understood as a piston block. That is, when it is needed, the central mounting block 8 is slid inside the external conduit 1 and sent into the designated position. After use, the central mounting block 8 and other components can be removed for cleaning by pulling the first air tube 18 or other means.
[0040] In one feasible embodiment, a retaining ring is provided on the inner wall of the external conduit 1, and the outer ring of the retaining ring is fixed to the inner wall of the external conduit 1. The retaining ring is used to restrict the installation position of the central mounting block 8 in the external conduit 1. The setting of the retaining ring avoids the problem that the mounting block is too close to the end of the external conduit 1, causing the limit stroke of the membrane rupture cone 13 to be located outside the end of the external conduit 1, that is, further avoids the problem that the membrane rupture cone 13 will cause damage to the fetus.
[0041] In one feasible approach, the end of the external catheter 1 that contacts the amniotic sac 2 has a rounded chamfer to avoid compression that could harm the fetus.
[0042] It should be noted that in this technical solution, components such as air pumps are required to generate negative pressure and pump air. The way they are used, the way the power of the air pumps and other components is controlled by program or manual, and the way they are used in conjunction with air pipes are all common knowledge well known to those skilled in the art, and will not be elaborated on here.
[0043] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.
Claims
1. An amniotic fluid drainage device for obstetrics, characterized in that: The device includes an external conduit (1), the interior of which is provided with mounting blocks. The mounting blocks include a front mounting block (4), a middle mounting block (8), and a rear mounting block (5) arranged sequentially. The outer surface of the middle mounting block (8) is sealed to the inner wall of the external conduit (1). The interior of the front mounting block (4) is provided with a tapered hole. The small diameter end of the tapered hole is located near the middle mounting block (8), and the large diameter end of the tapered hole is connected to the outer side of the end of the front mounting block (4). The interior of the rear mounting block (5) is provided with a through mounting groove (7), which is connected to the interior of the tapered hole. The interior of the tapered hole is provided with a tapered block (12), the height of which is less than [missing information]. The height of the conical hole, the rear mounting block (5) is provided with a fixing ring (20), the middle part of the fixing ring (20) is provided with a connecting hole (21), the fixing ring (20) and the small diameter end of the conical block (12) are provided with a compression spring (14), the two ends of the compression spring (14) are respectively fixed to the small diameter end of the conical block (12) and the fixing ring (20), the small diameter end of the conical block (12) is provided with a traction rope (15), one end of the traction rope (15) is fixed to the conical block (12), the other end of the traction rope (15) passes through the connecting hole (21) and the mounting groove (7), and extends to the outside of the end of the external conduit (1), and can be detachably connected to the surface of the external conduit (1); During drainage, under the reset action of the compression spring (14), a pulling force is applied to the traction rope (15). The length of the traction rope (15) moving into the external catheter (1) is manually controlled, and the movement distance of the control cone block (12) in the cone hole is controlled, thereby controlling the size of the gap formed between the cone block (12) and the cone hole, and thus controlling the flow rate of amniotic fluid (3) discharged outward.
2. The amniotic fluid drainage device for obstetrics according to claim 1, characterized in that: An installation gap is provided between the front mounting block (4) and the external conduit (1). A plurality of first airways (10) are circumferentially arranged on the middle mounting block (8) within the installation gap. A first annular cavity (16) is provided on the outer side of each first airway (10). The first annular cavity (16) is fixed to the middle mounting block (8). The interior of the first annular cavity (16) communicates with the ends of the plurality of first airways (10). A first air tube (18) is provided on the side of the first annular cavity (16). One end of the trachea (18) is connected to the interior of the first annular cavity (16), and the other end of the first trachea (18) extends to the outer side of the end of the external conduit (1). The large-diameter end of the front mounting block (4) is located inside the end of the external conduit. The large-diameter end of the conical block (12) is provided with a membrane-breaking cone (13). The membrane-breaking cone (13) is fixed on the conical block (12). The limit movement position of the membrane-breaking cone (13) is located between the end of the external conduit (1) and the end of the front mounting block (4).
3. The amniotic fluid drainage device for obstetrics according to claim 2, characterized in that: The front mounting block (4) has an annular groove at its end, and an annular airbag (9) is provided in the annular groove. The inner ring of the annular airbag (9) is fixed in the annular groove. The inner circumference of the wall of the front mounting block (4) has a plurality of second air passages (11). One end of the plurality of second air passages (11) is connected to the annular airbag (9). The other end of the second air passage (11) is provided with a second annular cavity (17). The second annular cavity (17) is fixed on the middle mounting block (8). The interior of the second annular cavity (17) is connected to the other end of the plurality of second air passages (11). The side of the second annular cavity (17) is provided with a second air tube (19). One end of the second air tube (19) is connected to the interior of the second annular cavity (17). The other end of the second air tube (19) extends to the outer side of the end of the external conduit (1).
4. The amniotic fluid drainage device for obstetrics according to claim 1, characterized in that: A third air pipe is provided at the end of the rear mounting tube. One end of the third air pipe is connected to the rear mounting tube, and the other end of the third air pipe extends to the outside of the end of the external conduit (1).
5. The amniotic fluid drainage device for obstetrics according to claim 1, characterized in that: A rubber sealing layer is provided on the outer surface of the central mounting block (8), and the rubber sealing layer slides in contact with the inner wall of the external conduit (1).
6. The amniotic fluid drainage device for obstetrics according to claim 5, characterized in that: The inner wall of the external conduit (1) is provided with a retaining ring, the outer ring of which is fixed to the inner wall of the external conduit (1). The retaining ring is used to restrict the installation position of the middle mounting block (8) inside the external conduit (1).
7. The amniotic fluid drainage device for obstetrics according to claim 1, characterized in that: The external catheter (1) has a chamfered edge with a smooth transition at the end that contacts the amniotic sac.