Cervical dilating rod capable of controlling medicine release

Abstract

The invention discloses a cervical dilation rod capable of controlling medicine release, and relates to the technical field of medical instruments, the cervical dilation rod comprises an insertion piece, one end of the insertion piece is fixedly connected with a connecting thread sleeve, one end of the connecting thread sleeve is fixedly connected with a limiting plate, and the interior of the connecting thread sleeve is in threaded connection with a driving rod; a plurality of flexible arc-shaped petals are installed at the end, away from the connecting thread sleeve, of the inserting piece, a liquid supplementing piece is fixedly connected to one side of the interior of the inserting piece, one end of the liquid supplementing piece communicates with the flexible arc-shaped petals, the driving rod is manually rotated, so that components in the driving rod operate, one end of the driving rod extrudes the flexible arc-shaped petals from inside to outside, and the flexible arc-shaped petals are fixed to the end, away from the connecting thread sleeve, of the inserting piece. The extrusion speed is stable, the multiple flexible arc-shaped flaps are expanded to achieve radial expansion, a doctor can control the expansion diameter in real time according to the hand feeling, follow-up operation treatment of the doctor is facilitated, the doctor becomes a main guide of the expansion process through pure mechanical transmission, accurate control can be conducted according to the real-time hand feeling, and the operation safety is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a cervical dilator with controlled drug release. Background Technology

[0002] Cervical dilators are minimally invasive medical devices specifically designed for gynecological clinical use. They are primarily used to gradually dilate the cervical canal, creating a pathway for subsequent diagnostic and treatment procedures. Their core structure is typically a cylindrical or conical rod, often made of medical-grade stainless steel, titanium alloy, or medical-grade silicone (soft dilators). The surface is polished to ensure a smooth, burr-free finish, and some models have graduated markings for precise control of the dilation depth. Based on the dilation method, they can be divided into mechanical dilators (such as metal dilators with a gradient design from thin to thick diameter) and pharmacological dilators (such as sustained-release dilators containing prostaglandins). The former achieves dilation through physical expansion, while the latter promotes cervical maturation, softening, and natural dilation through medication. Both types must meet aseptic medical standards to ensure clinical safety.

[0003] The core purpose of cervical dilators is to gently and gradually dilate the cervix to the required diameter, avoiding complications such as cervical tearing and bleeding caused by forced manipulation, while creating a safe passage for the entry of instruments into the uterine cavity. Their clinical applications are mainly concentrated in various gynecological surgeries, including: induced abortion (especially vacuum aspiration, which requires cervical dilation to accommodate the suction tube into the uterine cavity), hysteroscopic surgery (such as endometrial polyp removal, myomectomy, and adhesiolysis, which require cervical dilation to allow the hysteroscope and instruments to enter the uterine cavity smoothly), tubal patency testing or hysterosalpingography (dilation of the cervix to facilitate catheter insertion into the uterine cavity for checking tubal patency), and cervical adhesiolysis (used to dilate adhered cervical canals, restoring normal access between the uterine cavity and the outside). In addition, during labor, soft dilators are sometimes used to assist in cervical ripening and dilation, helping to shorten labor and reduce the risk of dystocia.

[0004] Currently, the disposable cervical dilators widely used in clinical practice mainly rely on the water-swelling properties of polymer materials (such as PVP and PVA) to mechanically dilate the cervix. This principle has the following inherent drawbacks: The expansion process is uncontrollable: the expansion rate and final size are determined by the water absorption properties of the material. Doctors cannot intervene in real time and accurately based on individual patient differences (such as cervical rigidity, primiparity or multiparity), which poses a risk of insufficient or excessive expansion.

[0005] Poor patient comfort: The continuous radial pressure applied during the self-expansion process can easily cause pain and cervical reflex spasm in patients, which in turn increases the difficulty of dilation.

[0006] Limited functionality: Existing products are only solid or simply coated rods, which cannot simultaneously provide analgesia or anesthesia during the crucial dilation step. Doctors need to perform additional procedures to administer medication to the cervix, which is a cumbersome process.

[0007] Therefore, there is an urgent need in the field for an integrated device that can combine controlled mechanical expansion with precise local drug delivery to improve the accuracy, safety and patient comfort of surgery. Summary of the Invention

[0008] The purpose of this application is to address the problems of uncontrollable dilation process, poor patient comfort, and limited functionality of dilators in the aforementioned background technology. This application provides a cervical dilator with controlled drug release.

[0009] To achieve the above objectives, this application specifically adopts the following technical solution: A controlled-release cervical dilator includes an insert, one end of which is fixedly connected to a connecting sleeve, one end of which is fixedly connected to a limiting plate, a drive rod being threadedly connected to the inside of the connecting sleeve, multiple flexible arc-shaped flaps being installed at the end of the insert away from the connecting sleeve, a fluid replenishment component being fixedly connected to one side of the insert, one end of which communicates with the flexible arc-shaped flaps, multiple auxiliary components being installed inside the drive rod, the auxiliary components being installed inside the insert, and a blocking plate being fixedly connected to one end of the drive rod.

[0010] By adopting the above technical solution, the internal components of the drive rod are operated by manually rotating the drive rod, so that one end of the drive rod squeezes multiple flexible arc-shaped flaps from the inside out and the squeezing speed is stable, so that multiple flexible arc-shaped flaps unfold and achieve radial expansion. The doctor can control the expansion diameter in real time according to the feel, which facilitates the doctor's subsequent operation and treatment. Through pure mechanical transmission, the doctor becomes the leader of the expansion process and can make precise control according to the real-time feel, which significantly improves the safety of the operation. Furthermore, when the drive rod drives the flexible arc-shaped flap to expand radially, the expansion action itself compresses the flexible arc-shaped flap, forcing the medication inside the flap to seep out and directly act on the surface of the cervical tissue being expanded, thereby achieving the effect of dilation and anesthesia. This allows the local anesthetic to be applied directly and targeted to the surface of the cervical tissue under the greatest pressure, reducing the patient's pain and spasm response from the source and improving the surgical experience. In addition, the kinetic energy of mechanical expansion is cleverly converted into the potential energy of compression for drug delivery. The two core functions share a single drive mechanism, deeply integrated, producing a synergistic effect. The design fits the actual clinical needs, simplifies the surgical procedure, and improves surgical efficiency.

[0011] Furthermore, one end of the drive rod is provided with an external thread, which is threadedly connected to the connecting threaded sleeve. Multiple grooves are provided on the external thread. The end of the drive rod away from the blocking plate is provided with a tapered abutment, and an inner cavity is provided inside the drive rod.

[0012] By adopting the above technical solution, the external thread and the connecting sleeve are continuously engaged by manually rotating the drive rod, which drives the drive rod to move inside the plug-in and causes the conical contact part to contact and squeeze multiple flexible arc-shaped flaps, so that the flexible arc-shaped flaps are opened at a uniform speed, thereby dilating the cervix. The doctor can then use instruments to operate on the dilated area through the inner cavity to carry out the surgery.

[0013] Furthermore, the flexible arc-shaped flap includes a flap body installed at one end of the flexible sleeve, the flap body being conical arc-shaped, and multiple flap bodies forming a conical column shape.

[0014] By adopting the above technical solution, multiple valves can be driven through the conical contact part, so that the multiple valves dilate the cervix.

[0015] Furthermore, the valve body has a liquid storage cavity inside, and multiple drainage ports are provided at one end of the valve body. A cross valve is provided inside the drainage port, and a cross valve is provided at the end of the valve body away from the drainage port. Multiple directional micropores are provided on the outer arc of the valve body.

[0016] By adopting the above technical solution, during dilation, the dilation action itself will compress the valve body, forcing the drug solution inside the reservoir cavity to seep out from the directional micropores and directly act on the surface of the cervical tissue being dilated, thus achieving the effect of dilation and anesthesia.

[0017] Furthermore, the fluid replenishment component includes a one-way valve fixedly connected to the insert, an injection tube installed inside the one-way valve, a flow tube fixedly connected inside one side of the insert, the one-way valve communicating with one end of the flow tube, an infusion chamber opened inside the end of the insert near the flexible arc-shaped valve, one end of the flow tube communicating with the infusion chamber, and one end of the second cross valve communicating with the infusion chamber.

[0018] By adopting the above technical solution, an external syringe is inserted into the injection tube to deliver the drug solution into the flow tube, which then delivers it into the infusion chamber. Finally, the drug solution is injected into the reservoir chamber through the cross valve.

[0019] Furthermore, the plug-in includes a flexible sleeve fitted on the outside of the drive rod, with multiple collars fixedly connected inside the flexible sleeve, and a movable cavity formed between the multiple collars, and the auxiliary component slidably installed inside the movable cavity.

[0020] By adopting the above technical solution, the ring can be driven by the operation of the auxiliary components, so that the ring surface forms an annular protrusion, which then comes into contact with the inner wall of the uterine cavity.

[0021] Furthermore, the flexible sleeve is a medical-grade silicone sleeve, and the collar is attached to the surface of the drive rod.

[0022] By adopting the above technical solution, the flexible sheath is made of medical-grade silicone, which is soft and will not cause damage to the patient. It is also less prone to bacterial growth, thus improving the safety of the surgery.

[0023] Furthermore, the auxiliary component includes an annular slider slidably connected inside the groove, a drive ring fixedly connected to the outer arc side of the annular slider, an elastic sheet rotatably connected to one end of the drive ring, and an end of the elastic sheet away from the drive ring rotatably connected to a collar, with both the drive ring and the elastic sheet located inside the movable cavity.

[0024] By adopting the above technical solution, the driving rod can drive the annular slider to move, so that the annular slider drives the driving ring to move towards the elastic sheet, thereby squeezing the elastic sheet, causing the elastic sheet to undergo arc deformation, and then abutting against the collar, so that an annular protrusion is formed on the surface of the collar.

[0025] In summary, this application includes at least one of the following beneficial effects; 1. In this application, by manually rotating the drive rod, the internal components of the drive rod are operated, causing one end to squeeze multiple flexible arc-shaped flaps from the inside out, and the squeezing speed is stable, so that the multiple flexible arc-shaped flaps unfold and achieve radial expansion. The doctor can control the expansion diameter in real time according to the feel, which facilitates the doctor's subsequent operation and treatment. Through pure mechanical transmission, the doctor becomes the leader of the expansion process and can make precise control according to the real-time feel, which significantly improves the safety of the operation.

[0026] 2. In this application, when the drive rod drives the flexible arc-shaped flap to expand radially, the expansion action itself will compress the flexible arc-shaped flap, forcing the drug solution inside the flexible arc-shaped flap to seep out and directly act on the surface of the cervical tissue being expanded, thereby achieving the effect of dilation and anesthesia. This allows the local anesthetic to be directly and targeted to the surface of the cervical tissue with the greatest stress, reducing the patient's pain and spasm response from the source and improving the surgical experience. In addition, the kinetic energy of mechanical expansion is cleverly converted into the potential energy of compression for drug delivery. The two core functions share a single drive mechanism, which is deeply integrated and produces a synergistic effect. The design fits the actual clinical needs, simplifies the surgical procedure, and improves surgical efficiency.

[0027] 3. In this application, when the driving rod expands the flexible arc-shaped flap, the driving rod can also drive the auxiliary component at the same time, causing the internal components of the auxiliary component to undergo elastic deformation, thereby placing the insert on top and causing the surface of the insert to bulge with an arc-shaped protrusion, which can then abut against the anterior inner wall of the uterus. This helps to fix the dilator rod, reducing the possibility of slippage between the insert and the flexible arc-shaped flap during cervical dilation, reducing the possibility of secondary damage to the patient during the operation, improving the stability during dilation, and further improving the safety of the operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a partial structural diagram of this application; Figure 3 This is a schematic diagram of the drive rod structure in this application; Figure 4 This is a schematic diagram of the structure of the plug-in in this application; Figure 5 This is a schematic diagram of the flexible arc-shaped flap structure in this application; Figure 6 This is a structural schematic diagram of the auxiliary component in this application.

[0029] Explanation of reference numerals in the attached figures: 1. Insert; 2. Connecting screw sleeve; 3. Limiting plate; 4. Drive rod; 5. Blocking plate; 6. Fluid replenishment component; 7. Flexible arc-shaped valve; 8. Auxiliary component; 11. Collar; 12. Flexible sleeve; 13. Movable cavity; 41. External thread; 42. Slide groove; 43. Conical contact part; 44. Inner cavity; 61. One-way valve; 62. Injection tube; 63. Flow tube; 64. Infusion chamber; 71. Valve body; 72. Drain port; 73. Storage chamber; 74. Cross valve one; 75. Cross valve two; 76. Directional micropore; 81. Drive ring; 82. Annular slider; 83. Elastic sheet. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0031] This application discloses a cervical dilator with controlled drug release.

[0032] Reference Figures 1 to 3A controlled-release cervical dilator includes an insert 1, one end of which is fixedly connected to a connecting sleeve 2, and one end of the connecting sleeve 2 is fixedly connected to a limiting plate 3. A drive rod 4 is threadedly connected inside the connecting sleeve 2. Multiple flexible arc-shaped flaps 7 are installed at the end of the insert 1 away from the connecting sleeve 2. A fluid replenishment component 6 is fixedly connected to one side of the inside of the insert 1, and one end of the fluid replenishment component 6 communicates with the flexible arc-shaped flaps 7. Multiple auxiliary components 8 are installed inside the drive rod 4 and installed inside the insert 1. A blocking plate 5 is fixedly connected to one end of the drive rod 4. An external thread 41 is provided on the surface of one end of the drive rod 4, and the external thread 41 is threadedly connected to the connecting sleeve 2. Multiple grooves 42 are provided on the external thread 41. A conical contact part 43 is provided at the end of the drive rod 4 away from the blocking plate 5, and an inner cavity 44 is provided inside the drive rod 4.

[0033] During the procedure, the insert 1 is first inserted into the vagina, allowing the flexible arc-shaped flaps 7 to reach the cervix. Then, by manually rotating the drive rod 4, the external thread 41 continuously engages with the connecting sleeve 2, driving the drive rod 4 to move inside the insert 1 and causing the conical contact part 43 to contact and compress multiple flexible arc-shaped flaps 7. This compresses the multiple flexible arc-shaped flaps 7 from the inside out, causing them to open at a uniform speed, thereby dilating the cervix. After dilation, the doctor can use instruments to operate on the dilated area through the inner cavity 44 to carry out the surgery. As the drive rod 4 rotates, it can move the blocking plate 5 towards the limiting plate 3, blocking the limiting plate 3. When the limiting plate 3 is completely in contact with the blocking plate 5, the maximum safe threshold for dilation is reached.

[0034] Furthermore, when the drive rod 4 compresses and drives the flexible arc-shaped flaps 7, causing multiple flexible arc-shaped flaps 7 to expand radially, the expansion action itself will compress the flexible arc-shaped flaps 7, forcing the drug solution inside the flexible arc-shaped flaps 7 to seep out and directly act on the surface of the cervical tissue being expanded, thereby achieving the effect of dilation and anesthesia. This allows the local anesthetic to be applied directly and targeted to the surface of the cervical tissue with the greatest stress, reducing the patient's pain and spasm response from the source and improving the surgical experience. At the same time, the kinetic energy of mechanical expansion is cleverly converted into the potential energy of compression for drug administration, producing a synergistic effect, simplifying the surgical procedure and improving surgical efficiency. During the operation, when the drug solution inside the flexible arc-shaped flaps 7 has seeped out and needs to be replenished, the drug solution can be injected into the replenishment device 6 through an external syringe and delivered to the flexible arc-shaped flaps 7 through the replenishment device 6, thereby replenishing the drug solution in the flexible arc-shaped flaps 7.

[0035] While the drive rod 4 expands the flexible arc-shaped flap 7, the drive rod 4 can also drive the auxiliary component 8, causing the internal components of the auxiliary component 8 to undergo elastic deformation, thereby placing the insert 1 on top and causing the surface of the insert 1 to bulge with an arc-shaped protrusion, which can then come into contact with the anterior inner wall of the uterus, thereby assisting in fixing the dilator. This reduces the possibility of the insert 1 and the flexible arc-shaped flap 7 slipping during cervical dilation, thus improving the safety of the operation.

[0036] Reference Figure 2 and Figure 5 The flexible arc-shaped valve 7 includes a valve body 71 installed at one end of the flexible sleeve 12. The valve body 71 is conical arc-shaped, and multiple valve bodies 71 form a conical cylinder. A liquid storage chamber 73 is opened inside the valve body 71, and multiple drainage ports 72 are opened at one end of the valve body 71. A cross valve 74 is provided inside the drainage port 72, and a cross valve 75 is provided at the end of the valve body 71 away from the drainage port 72. Multiple directional micropores 76 are provided on the outer side of the arc of the valve body 71. The fluid replenishment component 6 includes a one-way valve 61 fixedly connected to the plug-in 1. An injection tube 62 is installed inside the one-way valve 61. A flow tube 63 is fixedly connected inside one side of the plug-in 1. The one-way valve 61 is connected to one end of the flow tube 63. An infusion chamber 64 is opened inside the end of the plug-in 1 near the flexible arc-shaped valve 7. One end of the flow tube 63 is connected to the infusion chamber 64, and one end of the cross valve 75 is connected to the infusion chamber 64.

[0037] The valve body 71 has a fluid reservoir 73 inside, which can store medication. The valve body 71 can be driven by the conical contact part 43, so that the valve body 71 dilates the cervix. During dilation, the dilation action itself will compress the valve body 71, forcing the medication inside the fluid reservoir 73 to seep out from the directional micropores 76 and directly act on the surface of the dilated cervical tissue, thus achieving the effect of dilation and anesthesia. In addition, if the squeezing force generated by dilation is too large, the medication inside the fluid reservoir 73 can be sprayed out from the cross valve 74 under pressure and sprayed onto the cervix through the drainage port 72. When it is necessary to replenish the medication inside the fluid reservoir 73, an external syringe can be inserted into the injection tube 62 to deliver the medication to the flow tube 63, and then deliver it to the infusion chamber 64 through the flow tube 63. After that, the medication is injected into the fluid reservoir 73 through the cross valve 75. Here, the inner arc side of valve 71 is made of rigid material, while the outer arc side is made of silicone composite material, specifically a compound of silicone rubber and nano-hydroxyapatite. Bioactive fillers are added to the silicone rubber base, which retains the flexibility and biocompatibility of silicone rubber while improving mechanical strength and anti-aging properties. This reduces the risk of deformation after long-term use and is suitable for complex gynecological surgeries. Its enhanced mechanical strength can prevent the valve from deforming or breaking during expansion. The bioactive fillers can reduce mucosal inflammation, making it especially suitable for expansion treatment in patients during the postoperative recovery period of cervical surgery, balancing treatment effectiveness and tissue protection.

[0038] Reference Figure 4 and Figure 6 The plug-in 1 includes a flexible sleeve 12 fitted on the outside of the drive rod 4. Multiple collars 11 are fixedly connected inside the flexible sleeve 12, and a movable cavity 13 is opened between the multiple collars 11. The auxiliary component 8 is slidably installed inside the movable cavity 13. The flexible sleeve 12 is a medical silicone sleeve. The collars 11 are in contact with the surface of the drive rod 4. The auxiliary component 8 includes an annular slider 82 slidably connected inside the slide groove 42. A drive ring 81 is fixedly connected to the outer arc side of the annular slider 82. An elastic piece 83 is rotatably connected to one end of the drive ring 81. The end of the elastic piece 83 away from the drive ring 81 is rotatably connected to the collar 11. Both the drive ring 81 and the elastic piece 83 are located inside the movable cavity 13. Here, the flexible sleeve 12 is made of medical silicone, which is soft and will not cause damage to the patient. It is also not easy for bacteria to grow, thus improving the safety of the operation.

[0039] When the drive rod 4 rotates and moves towards the flexible arc-shaped petal 7, it can simultaneously drive the annular slider 82 to move, causing the annular slider 82 to drive the drive ring 81 to move towards the elastic piece 83, thereby squeezing the elastic piece 83 and causing the elastic piece 83 to undergo arc-shaped deformation, which in turn abuts against the collar 11, forming an annular protrusion on the surface of the collar 11, which in turn abuts against the inner wall of the uterus, thus assisting in fixing the dilator and reducing the possibility of slippage between the insert 1 and the flexible arc-shaped petal 7 during cervical dilation. When the drive rod 4 rotates, the annular slider 82 slides inside the groove 42, which can prevent the auxiliary component 8 from shifting when the drive rod 4 drives it. Here, the elastic sheet 83 is made of medical-grade stainless steel, which has excellent elastic modulus, corrosion resistance and sterilization resistance. The surface is smooth and burr-free after polishing. The elasticity is enhanced by cold working process, so that the elastic sheet 83 can support multiple reciprocating arc deformation and rebound reset.

[0040] Working principle: During the operation, the insert 1 is first inserted into the vagina so that the flexible arc-shaped flap 7 reaches the cervix. Then, by manually rotating the drive rod 4, the external thread 41 and the connecting sleeve 2 continuously engage, driving the drive rod 4 to move inside the insert 1 and drive the conical contact part 43 to drive multiple flaps 71. This squeezes multiple flaps 71 from the inside out, causing the flaps 71 to open at a uniform speed, thereby dilating the cervix. After dilation, the doctor can use the inner cavity 44 to operate instruments on the dilated area to carry out the operation.

[0041] Furthermore, when the drive rod 4 compresses and drives the flexible arc-shaped flaps 7, causing multiple flexible arc-shaped flaps 7 to expand radially, the expansion action itself will compress the flap body 71, forcing the drug solution inside the reservoir 73 to seep out from the directional micropores 76 and directly act on the surface of the cervical tissue being expanded, thus achieving the effect of expansion and anesthesia. This allows the local anesthetic to be directly and targeted to the surface of the cervical tissue with the greatest stress, reducing the patient's pain and spasm response from the source and improving the surgical experience. At the same time, the kinetic energy of mechanical expansion is cleverly converted into the potential energy of compression for drug administration, producing a synergistic effect, simplifying the surgical procedure and improving surgical efficiency. During the operation, when it is necessary to replenish the drug solution inside the reservoir 73, an external syringe can be inserted into the injection tube 62 to deliver the drug solution to the flow tube 63, which then delivers it to the infusion cavity 64. After that, the drug solution is injected into the reservoir 73 through the cross valve 2 75, thereby replenishing the drug solution for the flexible arc-shaped flaps 7.

[0042] When the drive rod 4 expands the flexible arc-shaped flap 7, the drive rod 4 can also move the annular slider 82 simultaneously. This causes the annular slider 82 to move the drive ring 81 toward the elastic sheet 83, thereby squeezing the elastic sheet 83 and causing it to deform in an arc shape. This causes the elastic sheet 83 to come into contact with the collar 11, forming an annular protrusion on the surface of the collar 11. This protrusion then comes into contact with the inner wall of the cervix, thus providing auxiliary fixation for the dilator and reducing the possibility of slippage between the insert 1 and the flexible arc-shaped flap 7 during cervical dilation, thereby improving the safety of the procedure.

Claims

1. A controlled-release cervical dilator, comprising a plug (1), characterized in that: One end of the plug (1) is fixedly connected to a connecting screw sleeve (2), and one end of the connecting screw sleeve (2) is fixedly connected to a limiting plate (3). The connecting screw sleeve (2) is internally threaded with a drive rod (4). The plug (1) is equipped with multiple flexible arc-shaped flaps (7) at the end away from the connecting screw sleeve (2). The plug (1) is internally fixedly connected to a liquid replenishing component (6), and one end of the liquid replenishing component (6) is connected to the flexible arc-shaped flaps (7). The drive rod (4) is internally equipped with multiple auxiliary components (8), and the auxiliary components (8) are installed inside the plug (1). One end of the drive rod (4) is fixedly connected to a blocking plate (5).

2. The cervical dilator with controlled drug release according to claim 1, characterized in that: The drive rod (4) has an external thread (41) on one end surface. The external thread (41) is threaded to the connecting sleeve (2). The external thread (41) has multiple grooves (42). The drive rod (4) has a tapered abutment (43) at the end away from the blocking plate (5). The drive rod (4) has an inner cavity (44) inside.

3. The cervical dilator with controlled drug release according to claim 1, characterized in that: The flexible arc-shaped flap (7) includes a flap body (71) installed at one end of the flexible sleeve (12), the flap body (71) is conical arc-shaped, and multiple flap bodies (71) form a conical column shape.

4. The cervical dilator with controlled drug release according to claim 3, characterized in that: The valve body (71) has a liquid storage chamber (73) inside, and a plurality of drain ports (72) are provided at one end of the valve body (71). A cross valve first (74) is provided inside the drain port (72), and a cross valve second (75) is provided at the end of the valve body (71) away from the drain port (72). A plurality of directional micropores (76) are provided on the outer side of the arc of the valve body (71).

5. A cervical dilator with controlled-release drug delivery according to claim 4, characterized in that: The fluid replenishment component (6) includes a one-way valve (61) fixedly connected to the plug (1). An injection tube (62) is installed inside the one-way valve (61). A flow tube (63) is fixedly connected inside one side of the plug (1). One end of the one-way valve (61) is connected to one end of the flow tube (63). An infusion chamber (64) is opened inside the plug (1) near the flexible arc-shaped valve (7). One end of the flow tube (63) is connected to the infusion chamber (64). One end of the cross valve (75) is connected to the infusion chamber (64).

6. A cervical dilator with controlled drug release according to claim 2, characterized in that: The plug-in (1) includes a flexible sleeve (12) sleeved on the outside of the drive rod (4). Multiple collars (11) are fixedly connected inside the flexible sleeve (12). A movable cavity (13) is opened between the multiple collars (11). The auxiliary component (8) is slidably installed inside the movable cavity (13).

7. A cervical dilator with controlled drug release according to claim 6, characterized in that: The flexible sleeve (12) is a medical silicone sleeve, and the collar (11) is attached to the surface of the drive rod (4).

8. A cervical dilator with controlled drug release according to claim 6, characterized in that: The auxiliary component (8) includes an annular slider (82) slidably connected inside the slide groove (42). A drive ring (81) is fixedly connected to the outer arc side of the annular slider (82). An elastic sheet (83) is rotatably connected to one end of the drive ring (81). The end of the elastic sheet (83) away from the drive ring (81) is rotatably connected to the collar (11). Both the drive ring (81) and the elastic sheet (83) are located inside the movable cavity (13).

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