CN219783493U - Contrast liquid-passing instrument - Google Patents

Abstract

The utility model relates to a contrast liquid-passing instrument, which comprises an inner tube and an outer tube; the inner pipe is arranged in the outer pipe in a penetrating way; the far end of the inner tube is provided with an injection port, and the other end of the inner tube is provided with a conical head; the outer tube is provided with a cervical cladding device. The advantages are as follows: through setting up conical head and cervical cladding device, in the in-process of using, only need put into the cervical intraductal can, avoid the contrast medium to flow out to with the cervical pipe shutoff, the inner tube of making a shadow only need insert at the ectocervical mouth can, avoided the sacculus pipe that tradition used, need the catheter head to get into the palace chamber, cause painful sense and uncomfortable sense to and the sacculus shelters from palace chamber and oviduct opening, the misdiagnosis's that easily causes the condition takes place. Secondly, through setting up the cooperation of cervical cladding device and cone, can be to the better supporting role of cone, prevent that the cone roll-off from leading to the radiography failure.

Description

A kind of contrast fluid passing device

Technical field

The utility model relates to the technical field of medical devices, specifically, it is an imaging fluid-passing device.

Background technique

Among the causes of female infertility, fallopian tube obstruction accounts for a large proportion, with statistics ranging from 30% to 50%. The simplest and most effective way to diagnose fallopian tube obstruction is hysterosalpingography, and there are other methods to treat fallopian tube obstruction. In addition to traditional gynecological surgeries, interventional methods for recanalization are currently very common in hospitals at all levels because they are simple to operate, convenient and effective, and have low technical requirements.

Currently, the most commonly used fallopian tube angiography is to use a balloon catheter to insert into the uterine cavity and then inject contrast agent. During the operation, it is sometimes necessary to use cervical forceps to clamp the cervix and pull it. The filled balloon before injecting the contrast agent will occupy the More than half of the uterine cavity space, these can cause varying degrees of pain and discomfort. This stimulates the nerve endings distributed in these areas. Most patients can regulate themselves through the nervous system. However, there are also a few patients who have poor autonomic nerve stability and enhanced vagus nerve reflexes, which causes the body to release a large amount of acetylcholine and promote coronary artery disease. Spasm, weakened myocardial contractility, reduced cardiac blood output, resulting in nausea and vomiting, chest tightness, pale complexion, drop in blood pressure, arrhythmia, etc. In severe cases, a series of symptoms such as coma, convulsions, and shock may occur. And when using a balloon catheter for salpingography, after the contrast agent is injected, the balloon will be filled in the uterine cavity. This may cause some adhesions, polyps, etc. in the uterine cavity to be blocked and cannot be observed. At the same time, due to The catheter may be squeezed to one side by the balloon, causing the contrast agent to flow sluggishly, and the fallopian tube on the other side is not visualized because there is no contrast agent, causing the false impression that the fallopian tube is blocked. And there is no scale on the catheter, so the distance into the uterine cavity cannot be judged.

Chinese patent document CN110812669A, application date 2019-11-22, patent name: fallopian tube contrast catheter device, discloses a fallopian tube contrast catheter device, which includes a first tube body, the inner cavity of the first tube body has a first channel and at least one second channel, the inner diameter of the first channel is greater than the inner diameter of the second channel, a joint is connected to the rear of the first pipe body, and each second channel of the first pipe body is close to the joint The parts are connected to an inflatable conduit respectively, and the other end of each inflatable conduit is connected to a power mechanism respectively. One or two balloons are sealingly connected to the outer front of the first tube body, and each balloon is filled with There is gas or liquid, and each of the balloons is connected to one of the second channels.

The fallopian tube imaging catheter device of the above-mentioned patent document has a simple structure design, can safely enter the cervix, and can safely, reliably and conveniently treat uterine inflammation with ozone. However, there is no corresponding disclosure regarding a technical solution that reduces patient discomfort and has good stability in covering the cervix.

In summary, there is an urgent need for a painless hysterosalpingography fluid-draining device that reduces patient discomfort and can cover the cervix with good stability. However, this kind of painless hysterosalpingography fluid-passing device has not yet been reported.

Contents of the invention

The purpose of this utility model is to provide a painless hysterosalpingography fluid-passing device that reduces patient discomfort and has good stability in covering the cervix.

In order to achieve the above purpose, the technical solution adopted by this utility model is:

An imaging fluid-passing device, which includes an inner tube and an outer tube; the inner tube is passed through the outer tube; the far end of the inner tube is provided with an injection port, and the other end is provided with a cone shaped head; the outer tube is provided with a cervical coating device; the cervical coating device includes a clamping piece, a linkage mechanism, a first fixed bracket, a second fixed bracket, and a reciprocating rod; the clamp The holding piece is installed on the linkage mechanism; one end of the linkage mechanism is fixed on the first fixed bracket, and the other end is fixed on the second fixed bracket; the first fixed bracket is arranged on the reciprocating rod; The second fixed bracket is arranged on the outer tube; the reciprocating rod is provided with sliding teeth; the cervical coating device is also provided with an adjustment knob; the adjustment knob is provided with conical teeth; The conical teeth mesh with the sliding teeth on the reciprocating rod.

As a preferred technical solution, when the adjustment knob rotates clockwise, the conical teeth rotate clockwise synchronously and drive the reciprocating rod to move backward; when the reciprocating rod moves backward, the linkage mechanism is driven to expand inward. , thus driving the clamping piece to tighten inward; when the adjustment knob rotates counterclockwise, the conical teeth rotate counterclockwise synchronously and drive the reciprocating rod to move forward; when the reciprocating rod moves forward, the linkage mechanism is driven Expand outward, thereby driving the clamping piece to expand outward.

As a preferred technical solution, the cone-shaped head is located at the internal cervix of the human body when in use; the cervical covering device is located at the front end of the cervix.

As a preferred technical solution, the conical head is made of silicone material

As a preferred technical solution, the inner tube is provided with a scale.

As a preferred technical solution, the length of the conical head 13 is 3.2-3.8cm.

The advantages of this utility model are:

1. The utility model's fallopian tube imaging instrument is equipped with a conical head and a cervical covering device. During use, the conical head only needs to be placed into the cervical canal to prevent the contrast fluid from flowing out and seal the cervical canal. Blocking, the inner tube for imaging only needs to be inserted into the external cervical opening, which avoids the traditional use of balloon catheters, which require the catheter head to enter the uterine cavity, causing pain and discomfort, and the balloon blocks the uterine cavity and fallopian tube opening. It is easy to cause misdiagnosis. Secondly, by arranging the cooperation between the cervical covering device and the cone head, the cone head can be better supported and prevented from slipping out, causing angiography failure.

2. The inner tube is equipped with a cone-shaped head. When in use, the cone-shaped head is located in the cervical canal and plays a role in fixing the cervical canal. You only need to insert the inner tube into the cervical canal and reach the internal os of the cervical canal to perform imaging. No need for Reach the uterine cavity. It does not occupy the uterine cavity space, the patient feels comfortable, and there is no problem of blocking the fallopian tube, and it can accurately determine whether the fallopian tube is open.

3. The tapered head is made of silicone material and has certain plastic deformation characteristics. When inserted, it can be compressed according to the shape of the cervical canal of different patients, thereby better sealing the cervical canal. It is especially suitable for patients with a history of childbirth or those with a history of childbirth. Patients who have undergone cervical surgery, causing the external cervix to become enlarged or irregularly shaped.

4. The outer tube is equipped with a cervical covering device. By covering the cervix, it ensures that the position of the cervix is fixed, so that the conical head and the front end of the inner tube will not enter the uterine cavity due to physiological peristalsis. It will not cause pain or discomfort to the patient.

5. The cervical coating device is designed as a purely mechanical structure. With the cooperation of the linkage mechanism and the reciprocating rod, and controlled by the manual control knob, the cervical coating and release can be achieved. Clever design, manual control, and good patient comfort.

6. The cervical covering device adopts pneumatic control and can automatically adjust according to the shape of the cervix. It will not slip out when grabbing objects with smooth surfaces. Secondly, by covering the cervix, it ensures that the position of the cervix is fixed, so that The tapered head and the front end of the inner tube will not enter the uterine cavity due to physiological peristalsis. It will not cause pain or discomfort to the patient.

7. The cervical coating device adopts pneumatic control and has good compliance and softness. It can be automatically adjusted according to the shape of the cervix and can cover cervixes of different shapes. It will not slip when grabbing objects with smooth surfaces. In addition, the pneumatic form will not cause mechanical damage compared with other mechanical structure forms.

8. Through the pressure sensor, the air pressure on the clamping piece can be detected and fed back to the driver. The driver controls the solenoid valve to adjust the pressure according to the pressure, so that the pressure on the clamping piece can be adjusted to avoid excessive or excessive pressure. Small, the patient has no pain or is not suitable.

9. The driver is equipped with a positive pressure switch and a negative pressure switch that control the air pump. When the positive pressure switch is activated, the air pump ventilates the clamping piece through the ventilation piece, and the clamping piece opens outwards under the action of air pressure. When the negative pressure switch is turned off, and when the negative pressure switch is turned on, the clamping piece forms a vacuum and is harvested inward to clamp the cervix. The design is clever, and the clamping piece uses pneumatic pressure to grasp and release the cervix. On the one hand, it can be adapted to wrap cervixes of different sizes (because after women give birth to children, some cervixes are large and some are small. The program can adapt to different cervix sizes).

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of a contrast-enhancing fluid-passing device of the present invention.

Figure 2 is a schematic structural diagram of the cervical covering device.

Figure 3 is a schematic diagram of the inner tube structure.

Figure 4 is a schematic diagram of the tightening state of the clamping piece of the fallopian tube imaging instrument of the present invention when in use.

Figure 5 is a schematic diagram of the opening of the clamping piece in the use state of the fallopian tube imaging instrument of the present invention.

Figure 6 is a schematic diagram of the overall structure of another contrast-enhancing fluid passing device of the present invention.

Figure 7 is a structural block diagram of the cervical coating device in the second embodiment.

Figure 8 is a schematic diagram of the internal cavity structure of the clamping piece.

The reference signs and components involved in the drawings are as follows:

1. Inner tube 11. Injection port

12. Scale 13. Taper head

2. External tube 3. Cervical covering device

31. Clamping piece 32. Link mechanism

33. The first fixed frame 34. The second fixed frame

35. Reciprocating rod 36. Sliding gear

37. Adjustment knob 38 conical teeth

4. Driver 41. Trachea

42. Air pump 43. Solenoid valve

44. Pressure sensor 45. Clamping front

46. Clamping reverse side 47. Gas cavity

48. Positive pressure switch 49. Negative pressure switch

5. Uterine cavity 6. Cervix

7. Cervical canal.

Detailed ways

The utility model will be further described below with reference to the embodiments and the accompanying drawings.

Example 1

Please refer to Figure 1 , which is a schematic diagram of the overall structure of a contrast-enhanced fluid-passing device of the present invention. An imaging fluid-passing device; the contrast-enhancing fluid passing device includes an inner tube 1 and an outer tube 2; the inner tube 1 is inserted into the outer tube 2; the far end of the inner tube 1 is provided with an injection port 11 , the other end is provided with a conical head 13; the outer tube 2 is provided with a cervical covering device 3.

Please refer to Figure 2, which is a schematic structural diagram of the cervical covering device 3. The cervical coating device 3 includes a clamping piece 31, a linkage mechanism 32, a first fixed bracket 33, a second fixing bracket 34, and a reciprocating rod 35; the clamping piece 31 is installed on the linkage mechanism 32. ; One end of the linkage mechanism 32 is fixed on the first fixed bracket 33, and the other end is fixed on the second fixed bracket 34; the first fixed bracket 33 is provided on the reciprocating rod 35; the second The fixed bracket 34 is provided on the outer tube 2; the reciprocating rod 35 is provided with sliding teeth 36; the cervical coating device 3 is also provided with an adjustment knob 37; the adjustment knob 37 is provided with a tapered Teeth 38; the conical teeth 38 mesh with the sliding teeth 36 on the reciprocating rod 35.

When the adjustment knob 37 rotates clockwise, the conical teeth 38 rotate clockwise synchronously and drive the reciprocating rod 35 to move backward; when the reciprocating rod moves backward, it drives the linkage mechanism 32 to expand inward, thereby driving the clamp. The holding piece 31 tightens inward; when the adjustment knob 37 rotates counterclockwise, the conical teeth 38 rotate counterclockwise synchronously and drive the reciprocating rod 35 to move forward; when the reciprocating rod moves forward, the linkage mechanism is driven 32 expands outward, thereby driving the clamping piece 31 to expand outward.

Please refer to Figure 3, which is a schematic structural diagram of the inner tube 1. The injection port 11 is provided with an anti-backflow valve; the length of the conical head 13 is 3.2-3.8cm. As a preference, the length of the conical head 13 is 3.5cm; the length of the inner tube 1 An opening is provided at the front end; a scale 12 is provided on the inner tube 1 .

Please refer to Figures 4 and 5. Figure 4 is a schematic diagram of the tightening state of the clamping piece 31 of the salpingography instrument of the present invention in use. Figure 5 is a schematic diagram of the clamping piece 31 opening in the use state of the fallopian tube imaging instrument of the present invention. The conical head 13 is located at the inner mouth of the human cervix 6 when in use; the cervical covering device 3 is located at the front end of the cervix 6 .

What needs to be explained in this embodiment is:

The inner tube 1 is provided with a conical head 13. In the use state, the conical head 13 is located in the cervical canal 7 and plays a role in fixing the cervical canal 7. It is only necessary to implant the inner tube 1 into the cervical canal 7. Imaging can be done as soon as it reaches the internal opening of the cervical canal 7 without reaching the uterine cavity 7 . It does not occupy the 7 space of the uterine cavity, the patient feels comfortable, and there is no problem of blocking the fallopian tube, and it can accurately determine whether the fallopian tube is unobstructed. In the traditional plan, a balloon is inserted into the uterine cavity 7 for contrast. During the operation, it is sometimes necessary to use cervical forceps to clamp the cervix 6 and pull it. The balloon that will be filled before injecting the contrast agent will account for more than Half of the uterine cavity space, these can cause varying degrees of pain and discomfort. This stimulates the nerve endings distributed in these areas. Most patients can regulate themselves through the nervous system. However, there are also a few patients who have poor autonomic nerve stability and enhanced vagus nerve reflexes, which causes the body to release a large amount of acetylcholine and promote coronary artery disease. Spasm, weakened myocardial contractility, reduced cardiac blood output, resulting in nausea and vomiting, chest tightness, pale complexion, drop in blood pressure, arrhythmia, etc. In severe cases, a series of symptoms such as coma, convulsions, and shock may occur. And when using a balloon catheter for salpingography, after the contrast agent is injected, the balloon will be filled in the uterine cavity. This may cause some adhesions, polyps, etc. in the uterine cavity to be blocked and cannot be observed. At the same time, due to The catheter may be squeezed to one side by the balloon, causing the contrast agent to flow sluggishly, and the fallopian tube on the other side is not visualized because there is no contrast agent, causing the false impression that the fallopian tube is blocked.

As a preference, the cone-shaped head 13 is made of silicone material and has certain plastic deformation characteristics. When inserted, it can be compressed according to the shape of the cervical canal 7 of different patients, thereby better sealing the cervical canal. 7. It is especially suitable for patients who have a history of childbirth or have undergone cervical uterine surgery, which has caused the external orifice of the cervix to become enlarged or irregular.

The outer side of the conical head 13 is provided with anti-slip threads, which effectively increases the contact area and prevents the conical head 13 from sliding out. The tapered head 13 can be configured to slide on the inner tube 1 and is suitable for adjustment by patients with different cervical 6 depths.

The inner tube 1 is provided with a scale 12 to facilitate medical personnel to assist in judging the distance of the inner tube 1 into the uterine cavity.

The outer tube 2 is provided with a cervical covering device 3. By covering the cervix 6, it is ensured that the position of the cervix 6 is fixed, so that the conical head 13 and the front end of the inner tube 1 will not enter due to physiological peristalsis. In the uterine cavity. It will not cause pain or discomfort to the patient.

The cervical coating device 3 includes a clamping piece 31, a linkage mechanism 32, a first fixed bracket 33, a second fixed bracket 34, and a reciprocating rod 35; wherein, the clamping piece 31 is at least two pieces, which is convenient for inserting the cervix into the cervix. A clamping point is established on the cervix 6 to cover the cervix 6; each linkage mechanism 32 is matched with a clamping piece 31, and the swing of the linkage mechanism 32 is controlled by the reciprocating motion of the reciprocating rod 35, thereby realizing the linkage mechanism. Clamping and tightening of the clamping piece 31 on 32. The first fixed bracket 33 is arranged on the reciprocating rod 35 and moves together with the reciprocating rod 35. The second fixed bracket is arranged on the outer tube 2 to keep one end of the link mechanism 32 fixed.

The reciprocating rod 35 is provided with sliding teeth 36, and the corresponding adjusting knob 37 is provided with conical teeth 38, so that the rotation of the adjusting knob 37 is converted into linear motion of the reciprocating rod. The clever design realizes manual control of the grabbing and opening of the clamping piece 31.

The cervical covering device 3 of this embodiment is designed to have a purely mechanical structure. With the cooperation of the linkage mechanism 32 and the reciprocating rod 35, and controlled by a manual control knob, the covering and releasing of the cervix 6 can be achieved. Clever design, manual control, and good patient comfort.

Example 2

Please refer to Figures 6 and 7. Figure 6 is a schematic diagram of the overall structure of another contrast-enhancing fluid-passing device of the present invention. Figure 7 is a structural block diagram of the cervical covering device 3 in the second embodiment. The contrast-enhanced recanalization device includes the contrast-enhanced fluid passage device including an inner tube 1 and an outer tube 2; the inner tube 1 is inserted into the outer tube 2; the distal end of the inner tube 1 is provided with an injection port. 11. The other end is provided with a tapered head 13; the outer tube 2 is provided with a cervical covering device 3.

The cervical coating device 3 includes a clamping piece 31, a driver 4, a trachea 41, an air pump 42, a solenoid valve 43, and a mounting frame; the clamping piece 31 is fixed on the mounting frame; one end of the trachea 41 is connected. The other end of the driver 4 is connected to the clamping piece 31; the air pump 42 is connected to the input end of the driver 4 through the solenoid valve 43; the driver 4 is provided with a pressure sensor 44, and the pressure sensor 44 is used to detect The pressure signal of the clamping piece 31 is transmitted to the driver 4. The driver 4 analyzes the pressure signal and outputs a control signal and transmits it to the solenoid valve 43. The solenoid valve 43 controls the air pump 42 after receiving the control signal. The size of the output gas pressure;

The clamping piece 31 is made of polymer silica gel; the driver 4 is provided with a positive pressure switch 48 and a negative pressure switch 49; when the positive pressure switch 48 is driven, the trachea 41 is positive to the clamping piece 31. When the negative pressure switch 49 is activated, the trachea 41 ventilates the clamping piece 31 with negative pressure, and the clamping piece 31 expands outwards due to the negative pressure of the air flow.

As a preference, in order to adjust the air pressure more accurately, the air pressure pipe is provided with a one-way throttle valve for adjusting the pressure in the air pipe 41, thereby adjusting the gas pressure in the clamping piece 31, Thereby adjusting the clamping force.

Please refer to FIG. 8 , which is a schematic diagram of the internal cavity structure of the clamping piece 31 . The clamping piece 31 includes a clamping front face 45 and a clamping back face; the clamping front face 45 and the clamping back face are both provided with a gas cavity 47, and the stroke of the gas cavity 47 of the clamping front face 45 is smaller than that of the clamping piece 31. Hold the gas cavity 47 on the opposite side 46.

What needs to be explained in this embodiment is:

This embodiment is provided with a cervical coating device 3. Unlike traditional mechanical clamps that rely on the shape and size of the clamped part, the cervical coating device 3 in this embodiment is controlled pneumatically and can be controlled according to the shape of the cervix 6 It is automatically adjusted so that it will not slip out when grabbing an object with a smooth surface. Secondly, by covering the cervix 6, it ensures that the position of the cervix 6 is fixed, so that the conical head 13 and the front end of the inner tube 1 will not move due to physiological peristalsis. Effect into the uterine cavity. It will not cause pain or discomfort to the patient.

In this embodiment, the cervical coating device 3 includes a clamping piece 31, a driver 4, a trachea 41, an air pump 42, and a solenoid valve 43. Among them, the air pump 42 ventilates the clamping piece 31 through the air pipe 41, and the solenoid valve 43 is used to control the size of the air flow. It is controlled by controlling the opening and closing size of the solenoid valve 43, so that the air pressure pump outputs gas with different pressure amplitudes, thereby controlling the clamping jaws. The opening displacement realizes the grasping of the cervix 6 and the control of the clamping force.

The driver 4 is provided with a positive pressure switch 48 and a negative pressure switch 49 that control the air pump 42. When the positive pressure switch 48 is activated, the air pump 42 ventilates the clamping piece 31 through the ventilation piece, and the clamping piece 31 opens outwards under the action of air pressure. . When the negative pressure switch 49 is turned off, or when the negative pressure switch 49 is turned on, the clamping piece 31 forms a vacuum and is harvested inward to clamp the cervix 6 . The design is clever, and the clamping piece 31 realizes the grasping and releasing of the cervix 6 through pneumatic pressure. On the one hand, it can be adapted to wrap the cervix 6 of different sizes (because after women give birth to children, some cervixes will be larger, and some will have larger cervixes). The cervix is small, and this solution can adapt to cervixes of different sizes); secondly, the covering force of the cervix is controlled by air pressure, which has good compliance and softness, and can cover cervixes of different shapes. cover.

The driver 4 is provided with a pressure sensor 44. The pressure sensor 44 is used to detect the pressure signal of the clamping piece 31 and transmit the pressure signal to the driver 4. The driver 4 analyzes the pressure signal and outputs a control signal. It is passed to the solenoid valve 43. After receiving the control signal, the solenoid valve 43 controls the output gas pressure of the air pump 42. The effect of this design is: through the pressure sensor 44, the air pressure on the clamping piece 31 can be detected and fed back to the driver 4. The driver 4 controls the solenoid valve 43 to adjust the pressure according to the pressure, so that the pressure on the clamping piece 31 is The pressure can be adjusted to prevent the pressure from being too high or too low, causing the patient no pain or discomfort.

The clamping piece 31 includes a clamping front face 45 and a clamping back face; the clamping front face 45 and the clamping back face are both provided with a gas cavity 47, and the stroke of the gas cavity 47 of the clamping front face 45 is smaller than that of the clamping piece 31. Hold the gas cavity 47 on the opposite side 46. The effect of this design is: through the cavities with different structures on the front and back of the clamping piece 31, the pressure difference is generated to cause the clamping piece 31 to deform in different directions, thereby realizing the wrapping of the cervix 6 by the clamping piece 31. Cover and release.

Driver 4 is equipped with a control board. The model of the control board can use the stm32f103 main control chip, which improves the accuracy of air pressure control and achieves precise control of air pressure. The pressure sensor 44 in the driver 4 can be a mems pressure sensor 44, which has high information collection sensitivity.

The utility model's fallopian tube imaging instrument is provided with a conical head 13 and a cervical coating device 3. During use, the conical head 13 only needs to be inserted into the cervical canal 7 to prevent the contrast fluid from flowing out and to keep the contrast fluid from flowing out. Cervical canal 7 is blocked, and the inner tube 1 for imaging only needs to be inserted into the outer opening of cervix 6. This avoids the traditional use of balloon catheters, which require the catheter head to enter the uterine cavity, causing pain and discomfort, as well as obstruction by the balloon. The opening of the uterine cavity and fallopian tubes can easily lead to misdiagnosis. Secondly, by arranging the cooperation between the cervical covering device 3 and the cone-shaped head 13, the cone-shaped head 13 can be better supported and prevented from slipping out, resulting in failure of imaging.

The above are only the preferred embodiments of the present utility model. It should be pointed out that those of ordinary skill in the art can also make several improvements and supplements without departing from the principles of the present utility model. These improvements and supplements can also be made. It should be regarded as the protection scope of this utility model.

Claims (6)

1. An imaging fluid-passing device, characterized in that the contrast-enhancing fluid passing device includes an inner tube and an outer tube; the inner tube is inserted into the outer tube; and the distal end of the inner tube is provided with an injection port. , the other end is provided with a tapered head; the outer tube is provided with a cervical coating device; the cervical coating device includes a clamping piece, a linkage mechanism, a first fixed bracket, a second fixed bracket, a reciprocating rod; the clamping piece is installed on the link mechanism; one end of the link mechanism is fixed on the first fixed bracket, and the other end is fixed on the second fixed bracket; the first fixed bracket is arranged on the reciprocating on the movement rod; the second fixed bracket is provided on the outer tube; the reciprocating rod is provided with sliding teeth; the cervical coating device is also provided with an adjustment knob; the adjustment knob is provided with Conical teeth; the conical teeth mesh with the sliding teeth on the reciprocating rod. 2. The imaging fluid passing instrument according to claim 1, characterized in that when the adjustment knob rotates clockwise, the conical teeth rotate clockwise synchronously and drive the reciprocating rod to move backward; when the reciprocating rod moves backward When moving, the connecting rod mechanism is driven to expand inward, thereby driving the clamping piece to tighten inward; when the adjustment knob is rotated counterclockwise, the conical teeth rotate counterclockwise synchronously, and drive the reciprocating rod to move forward; when the reciprocating When the rod moves forward, it drives the connecting rod mechanism to expand outward, thereby driving the clamping piece to expand outward. 3. The imaging fluid-passing device according to claim 1, wherein the cone-shaped head is located at the internal cervix of the human body when in use; and the cervical covering device is located at the front end of the cervix. 4. The imaging fluid passing device according to claim 1 or 3, characterized in that the tapered head is made of silicone material. 5. The imaging fluid passing instrument according to claim 1, characterized in that the inner tube is provided with a scale. 6. The imaging fluid passing instrument according to claim 1, characterized in that the length of the tapered head is 3.2-3.8cm.