Cervical dilation device and method for gynaecology and obstetrics

Abstract

The invention relates to a cervical dilation device and method for the obstetrics and gynecology department. The cervical dilation device comprises a shell, a separation shell clamped to one side of the shell, an inner core arranged in the shell, a guide part arranged in the separation shell and an empty cylinder. The mounting bracket is detachably connected to the other side of the shell; the at least one group of clamping assemblies are arranged in the mounting bracket and are used for clamping and fixing the empty cylinder; the injection mechanism is connected in the mounting bracket in a sliding manner and is used for pushing liquid in the empty cylinder to be injected into the inner core or extracted from the inner core through the mounting bracket; by means of the innovative clutch type transmission design, when the device needs to be withdrawn, an operator only needs to directly, rapidly and axially pull the injection column, the piston can be driven to rapidly pump liquid in the inner core back to the empty cylinder, the inner core is rapidly shrunk, traditional slow reverse rotation operation is abandoned in the process, time consumed in the withdrawing stage is reduced to the minimum, and the device is convenient to use. Therefore, the whole operation time is effectively shortened, the turnover efficiency of an operating room is improved, and related risks possibly brought by instrument retention are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a cervical dilatation device for gynecology and obstetrics and a method thereof. BACKGROUND

[0002] In the clinical operation of gynecology and obstetrics, cervical dilatation is a common and key operation step, which is widely used in operations such as artificial abortion, hysteroscopy, endometrial biopsy, intrauterine device placement or removal, etc. The purpose of cervical dilatation is to safely and progressively expand the inner diameter of the cervical canal so that subsequent medical devices can smoothly enter the uterine cavity, while minimizing trauma to the cervical tissue and patient pain. Currently, the commonly used cervical dilatation devices in clinical practice generally include mechanical dilatation rods (such as Hegar dilators) and inflatable dilatation devices based on fluid pressure. The basic operation process of an existing inflatable cervical dilatation device is as follows: the patient is placed in a lithotomy position, the vaginal speculum is used to dilate the vagina, and the cervical orifice is exposed; the guide part at the front end of the dilator is placed at the cervical orifice, and the inner core is gently pushed to pass through the cervical canal and enter the uterine cavity; then the liquid in the water storage cylinder is pushed into the inflatable structure (such as a balloon) in the inner core through the rotating screw mechanism, causing it to inflate and thus uniformly and controllably dilate the cervical canal. This device controls the injection of water through a screw drive, which improves the injection speed and volume accuracy to some extent, facilitating stable and adjustable dilatation force. However, in actual use, it is found that this device has obvious deficiencies in the removal stage after the operation is completed. When the inflated part needs to be retracted to remove the device, the liquid still needs to be slowly withdrawn by reversing the rotation of the screw, which takes a long time. This not only prolongs the overall operation time and affects the operation efficiency, but also slightly increases the risk of infection or patient discomfort due to the increased residence time of the device. Therefore, the cervical dilatation device based on the bidirectional transmission of the screw in the prior art has low liquid discharge (retraction) efficiency and needs to be improved. SUMMARY

[0003] The present application aims to provide a cervical dilatation device for gynecology and obstetrics and a method thereof.

[0004] The purpose of the present application is achieved by the following technical solution: a cervical dilatation device for gynecology and obstetrics and a method thereof, comprising a shell, a separation shell connected to one side of the shell, an inner core arranged in the shell, a guide part and a cylinder arranged in the separation shell. Further comprising: a mounting bracket, which is detachably connected to the other side of the shell; at least one set of clamping components arranged in the mounting bracket for clamping and fixing the cylinder; an injection mechanism slidably connected in the mounting bracket for pushing the liquid in the cylinder to be injected into the inner core or withdrawn through the mounting bracket; The injection mechanism includes an injection column, the inner wall of the mounting bracket is provided with a spiral groove, and the side wall of the injection column is provided with a plurality of helically distributed clearance holes. Multiple mating blocks are slidably disposed inside the injection column. Each mating block is provided with an elastic element a between itself and the inner wall of the injection column, and one end of the elastic element a is fixedly connected to a contact column. The injection mechanism further includes a triggering unit for driving the contact post to drive the corresponding mating block to overcome the elastic force of the elastic element a and extend out of the relief hole to engage with the spiral groove.

[0005] The triggering unit includes at least one trigger block disposed inside the injection column. The side of the trigger block contacts the end of the contact column. The pressing column slides through one end of the injection column and is fixedly connected to the trigger block. An elastic element b is disposed between the pressing column and the injection column to provide a reset elastic force that separates the trigger block from the contact column.

[0006] The clamping assembly includes a guide rod fixed within the mounting bracket and two clamping blocks symmetrically slidably sleeved on the guide rod. Each clamping block is rotatably mounted with an adjusting wheel, and an elastic element c is provided between the clamping block and the mounting bracket. The two adjusting wheels are used to clamp and drive the empty cylinder to move together.

[0007] An injection tube is provided inside the mounting bracket. The injection tube is connected to the inner core. Rotating the adjusting wheel can drive the empty cylinder to move towards the injection tube and make the nipple of the empty cylinder sealed to the injection tube.

[0008] An adjusting column is also threaded inside the housing. Rotating the adjusting column can compress the surface of the inner core to seal it. Both the inner core and the guide are made of silicone.

[0009] The guide portion has a hollow structure, and the expansion portion of the inner core is housed within the guide portion. The cross-section of the trigger block is cross-shaped, enabling it to simultaneously contact multiple contact posts distributed circumferentially.

[0010] During operation, pressing the pressing column moves the trigger block, which in turn squeezes multiple contact columns, causing each contact column to extend its corresponding mating block out of the clearance hole and engage with the spiral groove. At this time, rotating the injection column allows for precise control of the injection column's advance speed through the engagement relationship between the spiral groove and the mating block, thereby achieving precise liquid injection.

[0011] S1. Gently insert the guide portion along with its unexpanded inner core into the cervix and push the shell along the direction of the cervical canal so that the expanded portion of the inner core reaches the predetermined position in the uterine cavity. S2. Install the pre-filled liquid empty cylinder onto the clamping assembly of the mounting bracket, and rotate the adjusting wheel to seal the empty cylinder with the injection tubing; then connect the mounting bracket to the housing; rotate the adjusting column to press its front end against the inner core surface to form an initial seal; S3. Reverse rotation of the adjusting column releases the pressure on the inner core and opens the fluid channel; press the pressing column of the injection column to make the trigger block push the mating block out and engage with the spiral groove; keep pressing and rotate the injection column to drive the piston to inject the liquid in the empty cylinder into the inner core through the injection tube, causing it to expand to dilate the cervix; S4. Release the pressing column to retract the mating block and disengage it from the spiral groove; directly pull the injection column axially to quickly draw the liquid in the inner core back into the empty cylinder through the piston to cause it to contract; then withdraw the entire device from the cervical canal and vagina.

[0012] Compared with the prior art, the advantages of the present invention are as follows: 1. This solution utilizes an innovative clutch-type transmission design. When the device needs to be withdrawn, the operator only needs to directly and quickly pull the injection column axially to drive the piston to rapidly draw the liquid in the inner core back into the empty cylinder, causing the inner core to contract rapidly. This process eliminates the traditional slow reverse rotation operation, minimizing the time spent in the withdrawal stage, thereby effectively shortening the overall operation time, improving the turnover efficiency of the operating room, and reducing the related risks that may be caused by instrument retention.

[0013] 2. This solution integrates the functions of "precision injection" and "rapid aspiration" onto a single injection column. It allows for switching between "press and rotate" and "release and pull directly" actions, eliminating the need for physicians to change instruments or perform complex mode conversions. The entire process from precise dilation to rapid withdrawal can be completed simply by changing hand movements, simplifying the operation steps. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is the present invention. Figure 1 A sectional view; Figure 3 This is the present invention. Figure 1 A split diagram; Figure 4 This is the present invention. Figure 3 A split diagram; Figure 5 This is a schematic diagram of the injection mechanism structure of the present invention; Figure 6 This is the present invention. Figure 5 A sectional view; Figure 7 This is a schematic diagram of the clamping component structure of the present invention; Figure 8 This is a schematic diagram of the clearance hole structure of the present invention; Figure 9 This is a schematic diagram of the mating block structure of the present invention; Figure 10 This is a schematic diagram of the threaded groove structure of the present invention; Figure 11 This is a schematic diagram of the trigger block structure of the present invention; Figure 12 This is a schematic diagram of the cross-section of the trigger block of the present invention.

[0015] Labeling Explanation: 1. Shell; 101. Separation Shell; 102. Inner Core; 103. Guide Section; 104. Empty Cylinder; 2. Mounting Bracket; 3. Injection Column; 301. Spiral Groove; 302. Displacement Hole; 303. Mating Block; 304. Elastic Component a; 305. Contact Column; 306. Pressing Column; 307. Elastic Component b; 4. Trigger Block; 5. Guide Rod; 501. Clamping Block; 502. Adjusting Wheel; 503. Elastic Component c; 6. Injection Pipeline; 7. Adjusting Column. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figures 1-12 The diagram shown is a schematic representation of an embodiment of a cervical dilation device and method for obstetrics and gynecology provided by the present invention, including a housing 1, a separation shell 101 snapped onto one side of the housing 1, an inner core 102 disposed inside the housing 1, a guide portion 103 disposed inside the separation shell 101, and an empty cylinder 104. Also includes: Mounting bracket 2 is detachably connected to the other side of housing 1; At least one set of clamping components is provided in the mounting bracket 2 for clamping and fixing the empty cylinder 104; The injection mechanism is slidably connected to the mounting bracket 2 and is used to push the liquid in the empty cylinder 104 into the inner core 102 through the mounting bracket 2 or to extract it. The injection mechanism includes an injection column 3, a spiral groove 301 is provided on the inner wall of the mounting bracket 2, and a plurality of helically distributed clearance holes 302 are provided on the side wall of the injection column 3. Multiple mating blocks 303 are slidably disposed inside the injection column 3. Each mating block 303 is provided with an elastic element a304 between itself and the inner wall of the injection column 3, and one end of the elastic element a304 is fixedly connected to a contact column 305. The injection mechanism also includes a triggering unit for driving the contact post 305 to drive the corresponding mating block 303 to overcome the elastic force of the elastic element a304 and extend out of the relief hole 302 to engage with the spiral groove 301. This design defines the overall structure of the device, with its core being the design of the engagement between the injection column 3, the mating block 303, and the spiral groove 301 within the mounting bracket 2. The beneficial effect is that by controlling the extension and retraction of the mating block 303 through the trigger unit, the injection column 3 can quickly switch between a "rotational propulsion mode engaged with the spiral groove 301" and an "axial free sliding mode disengaged from engagement." This directly corresponds to the two clinical operation requirements of "precise injection expansion" and "rapid aspiration withdrawal," solving the problem of low removal efficiency in traditional single-screw mechanisms.

[0017] The triggering unit includes at least one triggering block 4 disposed inside the injection column 3. The side of the triggering block 4 contacts the end of the contact column 305. The pressing column 306 slides through one end of the injection column 3 and is fixedly connected to the triggering block 4. The elastic element b307 is disposed between the pressing column 306 and the injection column 3 to provide a reset elastic force that separates the triggering block 4 from the contact column 305. The scheme further defines the specific composition of the trigger unit, including trigger block 4, pressing post 306 and elastic element b307. Its working principle is: pressing down on pressing post 306 can directly drive trigger block 4 to move and squeeze contact post 305; after releasing, elastic element b307 can automatically reset trigger block 4. The beneficial effect is that it provides a trigger mechanism that is intuitive to operate, responds quickly and can automatically reset, ensuring the reliability and convenience of mode switching.

[0018] The clamping assembly includes a guide rod 5 fixed in the mounting bracket 2 and two clamping blocks 501 symmetrically slidably sleeved on the guide rod 5. Each clamping block 501 is rotatably mounted with an adjusting wheel 502, and an elastic element c503 is provided between the clamping block 501 and the mounting bracket 2. The two adjusting wheels 502 are used to clamp and drive the empty cylinder 104 to move together. The scheme specifically describes the structure of the clamping assembly, which consists of a guide rod 5, a clamping block 501, an adjusting wheel 502, and an elastic element c503. The beneficial effect is that the empty cylinder 104 is clamped by two rotatable adjusting wheels 502, which not only fixes it firmly, but also allows the empty cylinder 104 to be easily driven to move axially by rotating the adjusting wheels 502 to achieve connection or disconnection with the injection line 6. The operation is convenient, and the elastic element c503 provides a constant clamping preload.

[0019] The mounting bracket 2 has an injection tube 6 inside, which is connected to the inner core 102. The rotating adjustment wheel 502 can drive the empty cylinder 104 to move towards the injection tube 6 and make the nipple of the empty cylinder 104 sealed to the injection tube 6. The scheme clarifies that the mounting bracket 2 is equipped with an injection line 6, and points out the function of the adjusting wheel 502 driving the empty cylinder 104 to connect with the line. Its working principle is that rotating the adjusting wheel 502 makes the nipple of the empty cylinder 104 tightly connected to the injection line 6, forming a sealed fluid channel. The beneficial effect is that it ensures the sealing of the entire liquid injection path from the empty cylinder 104 to the inner core 102, prevents liquid leakage, and ensures the effectiveness of liquid injection and liquid withdrawal operations.

[0020] The housing 1 is also threadedly connected to an adjusting column 7. Rotating the adjusting column 7 can press the surface of the inner core 102 to seal the inner core 102. Both the inner core 102 and the guide part 103 are made of silicone. The design adds an adjusting column 7 threaded into the housing 1, which is specified to be used to compress the silicone inner core 102 to achieve a seal. The beneficial effect is that, before the injection begins, the fluid channel can be actively closed by rotating the adjusting column 7 to compress the inner core 102, preventing accidental liquid infiltration that could cause the inner core 102 to expand prematurely, thus improving the safety of the device in standby mode. The inner core 102 and the guide part 103 are made of silicone, which has good biocompatibility and high flexibility.

[0021] The guide part 103 has a hollow structure, and the expansion part of the inner core 102 is housed in the guide part 103. The cross-section of the trigger block 4 is cross-shaped, which can simultaneously contact multiple contact posts 305 distributed along the circumference. The scheme further clarifies that the guide part 103 is a hollow structure to accommodate the inner core 102, and defines the trigger block 4 as a cross-shaped cross section. The beneficial effect is that the hollow guide part 103 can guide the inner core 102 to be inserted and protect the cervical tissue. The cross-shaped trigger block 4 can simultaneously and evenly drive all the circumferentially arranged contact posts 305, ensuring that multiple mating blocks 303 extend or retract synchronously and smoothly, making the transmission engagement and disengagement process more reliable.

[0022] During operation, pressing the pressing column 306 moves the trigger block 4, which in turn squeezes multiple contact columns 305. This causes each contact column 305 to extend its corresponding mating block 303 out of the clearance hole 302 and engage with the spiral groove 301. At this time, rotating the injection column 3 allows for precise control of the injection column 3's advance speed through the engagement relationship between the spiral groove 301 and the mating block 303, thereby achieving precise liquid injection. The method claims protect the complete surgical procedure using the device. Its core steps, "press and rotate for precise fluid injection" and "release and pull directly for rapid fluid drainage," rely entirely on the unique function of the switchable transmission mechanism in the aforementioned device claims. The beneficial effect is that it combines innovative instrument structure with optimized surgical operation steps to form a standardized and efficient surgical method, significantly shortening the overall surgical time, especially accelerating the instrument withdrawal phase, thereby reducing patient discomfort and improving clinical efficiency.

[0023] S1. Gently insert the guide 103 along with the unexpanded inner core 102 into the cervix and push the housing 1 along the direction of the cervical canal so that the expanded part of the inner core 102 reaches the predetermined position in the uterine cavity. S2. Install the pre-filled liquid empty cylinder 104 onto the clamping assembly of the mounting bracket 2, and rotate the adjusting wheel 502 to seal and connect the empty cylinder 104 with the injection line 6; then connect the mounting bracket 2 to the housing 1; rotate the adjusting column 7 to make its front end press against the surface of the inner core 102 to form an initial seal; S3. Reverse rotation of the adjusting column 7 releases the pressure on the inner core 102 and opens the fluid channel; press the pressing column 306 of the injection column 3 to make the trigger block 4 push the mating block 303 out and engage with the spiral groove 301; keep pressing and rotate the injection column 3 to drive the piston to inject the liquid in the empty cylinder 104 into the inner core 102 through the injection tube 6, so that it expands to dilate the cervix. S4. Release the pressing column 306 to retract the mating block 303 and disengage it from the spiral groove 301; directly pull the injection column 3 axially to quickly draw the liquid in the inner core 102 back to the empty cylinder 104 through the piston to make it contract; then withdraw the entire device from the cervical canal and vagina.

[0024] The working principle of this solution fully covers the entire process from preoperative preparation and precise dilation to rapid withdrawal. Its core lies in the convenient switching between the two operation modes of "precise injection" and "rapid aspiration" through a set of switchable transmission mechanisms. Before the surgery began, the patient was placed in the lithotomy position, and the doctor used a vaginal speculum to dilate the vagina and expose the cervix. First, the separation shell 101 of the device is separated from the housing 1. At this time, it can be seen that the guide part 103 (which is a hollow silicone structure) wraps the unexpanded inner core 102 (also made of silicone material). This design facilitates preoperative examination and disinfection. The doctor holds the part that is connected to the shell 1 and gently inserts the tip of the guide part 103 into the external os of the cervix. Then, the doctor pushes the shell 1 smoothly along the direction of the cervical canal. The shell 1 drives the inner core 102 inside to move synchronously, so that the inner core 102 passes through the cervical canal and finally its expanded part reaches the predetermined position in the uterine cavity. The guide part 103 plays a guiding and protecting role in this process. The empty cylinder 104 pre-filled with sterile liquid is placed on the clamping assembly of the mounting bracket 2. The two clamping blocks 501 initially clamp the empty cylinder 104 under the action of the elastic element c503. By rotating the adjusting wheel 502, the empty cylinder 104 can be driven to slide until its nipple is tightly connected to the injection tubing 6 in the mounting bracket 2. The mounting bracket 2 of the assembled empty cylinder 104 is detachably connected to the rear end of the shell 1 to make the entire liquid passage unobstructed. Before injection begins, the front end of the adjusting column 7 (threaded into the housing 1) is rotated to press the surface of the inner core 102 inward, forming a mechanical seal. This operation ensures that the liquid in the empty cylinder 104 will not accidentally enter the inner core 102 when not injecting, and the device is in a safe standby state. When controlled cervical dilation is required, follow these steps: First, rotate the adjusting column 7 in the opposite direction to move its front end backward, thereby releasing the pressure on the inner core 102 and opening the channel for liquid to flow into the inner core 102. The operator presses the pressing column 306 at the end of the injection column 3 with his finger. The pressing column 306 pushes the trigger block 4 to move. The trigger block 4 (with its cross-shaped cross section) simultaneously squeezes multiple circumferentially distributed contact columns 305. The contact post 305 drives the mating block 303 to overcome the elastic force of the elastic element a304, and extends out from the relief hole 302 of the injection post 3 to engage with the spiral groove 301 on the inner wall of the mounting bracket 2, and the elastic element b307 is stretched. At this time, the injection column 3 is rotated. Under the meshing transmission of the mating block 303 and the spiral groove 301, the injection column 3 is pushed forward at a constant speed according to the precise pitch. The piston connected to the front end of the injection column 3 is then pushed into the empty cylinder 104, and the liquid is smoothly injected into the inner core 102 through the injection pipe 6 and the inner passage of the shell 1. The continuous injection of liquid causes the inner core 102 to expand evenly in the uterine cavity, thereby applying a controllable radial expansion force to the cervical canal from the inside out. The doctor can precisely control the degree of expansion by controlling the angle or number of rotations of the injection column 3. Once the expansion has reached the desired level, the equipment needs to be removed. Follow these steps: Under the restoring force of elastic element b307, trigger block 4 returns to its original position. Subsequently, under the pulling force of elastic element a304, all mating blocks 303 retract, disengaging from the spiral groove 301. Injection column 3 returns to its free sliding state. The operator can directly and quickly pull the injection column 3 axially. The injection column 3 moves backward, causing its piston to exit from the empty cylinder 104, generating negative pressure, which quickly draws the liquid in the inner core 102 back into the empty cylinder 104, and the inner core 102 then quickly contracts and recovers. After the inner core 102 has fully contracted, first rotate the adjusting column 7 in the opposite direction to gently press the root of the inner core again to prevent residual liquid from dripping. Then, the entire device (including the guide part 103, the contracted inner core 102 and the shell 1) can be gently removed from the cervical canal and vagina. Finally, the mounting bracket 2 and the empty cylinder 104 can be separated and the used components can be disposed of. This solution utilizes a clutch-type transmission mechanism consisting of trigger block 4, cooperating block 303, and spiral groove 301 to enable a single injection column 3 to perform both "rotational precision injection" and "linear rapid aspiration" modes. This fundamentally solves the problem of slow removal of traditional screw-type expanders. While ensuring the expansion process is precise and controllable, it significantly shortens the operation time at the end of the surgery, improving surgical efficiency and patient comfort.

Claims

1. A gynecological cervical dilatation device, comprising a shell (1), a separation shell (101) clamped on one side of the shell (1), an inner core (102) arranged in the shell (1), a guide part (103) and an empty cylinder (104) arranged in the separation shell (101); characterized in that Further comprising: a mounting bracket (2) detachably connected to the other side of the shell (1); at least one set of clamping assemblies arranged in the mounting bracket (2) for clamping and fixing the empty cylinder (104); an injection mechanism slidingly connected in the mounting bracket (2) for pushing the liquid in the empty cylinder (104) to inject into the inner core (102) through the mounting bracket (2) or to extract it; the injection mechanism comprises an injection column (3), the inner wall of the mounting bracket (2) is provided with a spiral groove (301), and the side wall of the injection column (3) is provided with a plurality of clearance holes (302) distributed in a spiral manner; a plurality of matching blocks (303) are slidingly arranged in the injection column (3), an elastic element a (304) is arranged between each matching block (303) and the inner wall of the injection column (3), and one end of each matching block (303) is fixedly connected with a contact column (305); the injection mechanism further comprises a trigger unit for driving the contact column (305) to drive the corresponding matching block (303) to extend out of the clearance hole (302) against the elastic force of the elastic element a (304) to engage with the spiral groove (301).

2. A gynecological cervical dilator as claimed in claim 1, wherein: The trigger unit comprises at least one trigger block (4) arranged inside the injection column (3), the side surface of the trigger block (4) is in contact with the end of the contact column (305), a pressing column (306) slidingly penetrates one end of the injection column (3) and is fixedly connected with the trigger block (4), and an elastic element b (307) is arranged between the pressing column (306) and the injection column (3) to provide a reset elastic force for separating the trigger block (4) from the contact column (305).

3. The gynecological cervical dilator device as claimed in claim 1, wherein: The clamping assembly comprises a guide rod (5) fixed in the mounting bracket (2), two clamping blocks (501) symmetrically slidingly sleeved on the guide rod (5), an adjusting wheel (502) rotatably mounted on each clamping block (501), and an elastic element c (503) arranged between the clamping block (501) and the mounting bracket (2); the two adjusting wheels (502) are used for jointly clamping and driving the movement of the empty cylinder (104).

4. A cervical dilator as claimed in claim 3, wherein: An injection pipeline (6) is arranged in the mounting bracket (2), the injection pipeline (6) is in communication with the inner core (102), rotating the adjusting wheel (502) can drive the empty cylinder (104) to move towards the injection pipeline (6), and the nipple of the empty cylinder (104) is in sealing connection with the injection pipeline (6).

5. The gynecological cervical dilator as claimed in claim 1, wherein: An adjusting column (7) is threadedly connected in the shell (1), rotating the adjusting column (7) can extrude the surface of the inner core (102) to seal the inner core (102), and the inner core (102) and the guide part (103) are both made of silica gel.

6. The gynecological cervical dilator according to claim 1, wherein: The guide part (103) is a hollow structure, the expansion part of the inner core (102) is contained in the guide part (103), the cross section of the trigger block (4) is cross-shaped, and can be in contact with multiple contact columns (305) distributed in the circumferential direction at the same time.

7. A gynecological cervical dilator as defined in claim 2 wherein: In operation, the pressing column (306) is pressed to drive the trigger block (4) to move, the trigger block (4) extrudes multiple contact columns (305), each contact column (305) drives the corresponding matching block (303) to extend out of the accommodation hole (302) and engage with the spiral groove (301), at this time, the injection column (3) is rotated, and the advancing speed of the injection column (3) can be accurately controlled through the matching relationship between the spiral groove (301) and the matching block (303), so that accurate injection is realized.

8. A method of using a gynecological cervical dilation device, comprising: The cervical dilatation device for gynecology and obstetrics according to any one of claims 1-7, the specific method comprises the following steps: S1. The guide part (103) is gently placed in the cervical os together with the unexpanded inner core (102) therein, and the shell (1) is pushed along the cervical canal direction, so that the expansion part of the inner core (102) reaches the predetermined position in the uterine cavity; S2. The empty cartridge (104) filled with liquid is installed on the clamping assembly of the mounting bracket (2), the adjustment wheel (502) is rotated to make the empty cartridge (104) in sealed communication with the injection pipeline (6), then the mounting bracket (2) is connected with the shell (1), and the adjustment column (7) is rotated to make the front end thereof extrude the surface of the inner core (102), so as to form an initial seal; S3. The adjustment column (7) is reversely rotated to release the extrusion on the inner core (102), so as to open the fluid passage; the pressing column (306) of the injection column (3) is pressed, so that the trigger block (4) drives the matching block (303) to extend out and engage with the spiral groove (301); the pressing is maintained and the injection column (3) is rotated, the piston drives the liquid in the empty cartridge (104) to be injected into the inner core (102) through the injection pipeline (6), so that the inner core (102) is expanded to dilate the cervix; S4. The pressing column (306) is released, so that the matching block (303) is retracted and separated from the spiral groove (301); the injection column (3) is directly axially pulled, the liquid in the inner core (102) is quickly drawn back into the empty cartridge (104) through the piston, so that the inner core (102) is contracted; then the device is withdrawn from the cervical canal and the vagina.

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