Hysteroscope resectoscope capable of preventing uterus perforation and use method of hysteroscope resectoscope

Abstract

The invention relates to the technical field of hysteroscope resectoscopes, and discloses a hysteroscope resectoscope capable of preventing uterine perforation and a using method thereof.The hysteroscope resectoscope comprises a hysteroscope body and a plurality of ultrasonic ranging modules, a camera is arranged at the far end of the hysteroscope body and faces the resection position, the ultrasonic ranging modules are arranged at the far end, and the ultrasonic ranging modules are arranged at the far end of the hysteroscope body and face the resection position. The ultrasonic ranging modules face the electric resection part and are used for measuring the thickness of the uterus wall of the electric resection part. According to the hysteroscope, the ultrasonic ranging modules are arranged at the far end of the hysteroscope body to measure the thickness of the uterus wall of the electric resection part, the situation that when an electric resection operation of uterine submucosal myoma or endometrial polyp is carried out, due to the fact that the thickness of the uterus wall cannot be accurately evaluated, uterus perforation is accidentally caused is avoided, the safety and accuracy of the operation are improved, and the operation efficiency is improved. Complications are reduced, and the fertility of a patient is protected.

Description

Technical Field

[0001] The present application relates to the technical field of hysteroscopic resectoscopes, and particularly to a hysteroscopic resectoscope for preventing uterine perforation and its using method. Background Art

[0002] In the field of gynecological surgery, hysteroscopic technology has become an indispensable diagnostic and treatment tool and is widely used in the treatment of endometrial polyps. Hysteroscopic surgery, with its minimally invasive nature, high-resolution imaging ability, and rapid recovery characteristics, is widely used in the treatment of space-occupying lesions such as intrauterine polyps, submucous myomas of the uterus, and retained placenta, and is also used in surgeries such as endometrial biopsy, adhesiolysis of intrauterine adhesions, and correction of septate uterus. These surgeries not only improve the treatment effect but also reduce the pain and recovery time of patients.

[0003] However, the existing hysteroscopic technology still has limitations in some aspects, especially in evaluating the thickness of the uterine wall. During the resection of submucous myomas of the uterus or endometrial polyps, due to the inability to accurately evaluate the thickness of the uterine wall, the resection loop may accidentally cut through the uterine wall, leading to serious complications. This situation not only brings immediate pain to the patient but may also have an impact on the patient's long-term health, especially for those women who have not given birth yet. The accidental perforation of the uterine wall may damage the integrity of the uterus, thereby affecting its fertility, and in severe cases, even lead to intestinal perforation, causing irreparable adverse consequences. In addition, this complication may also increase the risk of infection, prolong the recovery time, and bring additional psychological and economic burdens to the patient.

[0004] Therefore, the existing technology still needs to be improved and developed, and there is a lack of a hysteroscopic resectoscope that can monitor the thickness of the uterine wall. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention arranges a plurality of ultrasonic ranging modules at the distal end of the hysteroscope body to measure the thickness of the uterine wall at the resection site, avoiding accidental uterine perforation during the resection of submucous myomas of the uterus or endometrial polyps due to the inability to accurately evaluate the thickness of the uterine wall, improving the safety and accuracy of the surgery, reducing the occurrence of complications, and protecting the fertility of patients.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A hysteroscopic resectoscope for preventing uterine perforation, comprising: a hysteroscope body, a camera is arranged at the distal end of the hysteroscope body, and the camera is arranged facing the resection site;

[0007] A plurality of ultrasonic ranging modules are provided at the distal end and all of the ultrasonic ranging modules are directed toward the electroresection site, and the plurality of ultrasonic ranging modules are used to measure the thickness of the uterine wall at the electroresection site.

[0008] Furthermore, the hysteroscope also includes: an alarm, which is respectively connected to the plurality of ultrasonic ranging modules, and is used for giving an alarm when the thickness of the uterine wall at the electroresection site is less than a preset thickness.

[0009] Furthermore, the frequency of the ultrasonic ranging module is less than 7.5 MHZ.

[0010] Furthermore, the hysteroscope body comprises: a fixing portion, wherein the fixing portion has a mounting surface at one end facing the distal end, and a plurality of the ultrasonic ranging modules are arranged on the mounting surface;

[0011] A movable part, wherein the movable part is arranged on the mounting surface, and the camera is arranged on the movable part;

[0012] Wherein, the movable part is driven to have a contracted state and an expanded state;

[0013] In the contracted state, the movable part is coaxially arranged with the fixed part, and the movable part covers a plurality of the ultrasonic ranging modules;

[0014] In the unfolded state, the movable part and the fixed part are arranged non-coaxially, and a plurality of ultrasonic ranging modules are arranged at intervals from the movable part.

[0015] Furthermore, the hysteroscope further comprises: a rotating shaft, one end of which is rotatably arranged on the fixed part, and the other end of which is fixedly connected to the movable part, and the rotating shaft and the fixed part are non-coaxially arranged.

[0016] Furthermore, the hysteroscope further comprises: a transmission hole, wherein the transmission hole is arranged through the fixing portion, and the axis of the transmission hole is parallel to the axis of the fixing portion, and the rotating shaft is rotatably arranged in the transmission hole.

[0017] Furthermore, one end of the rotating shaft away from the movable part forms a control end, and the control end is driven to rotate to drive the movable part to be in a retracted state or an extended state.

[0018] Furthermore, the outer diameter of the movable part is not less than the outer diameter of the fixed part.

[0019] Furthermore, the electrocutting portion of the electrocutting ring is located in a direction where the movable portion is away from the fixed portion, and the electrocutting portion is coaxially arranged with the fixed portion.

[0020] A method for using a hysteroscopic resectoscope for preventing uterine perforation as described above, comprising the following steps: driving the movable part and making the movable part in a contracted state;

[0021] Moving the movable part and the fixed part to a preset position;

[0022] Driving the movable part and making the movable part in an unfolded state.

[0023] Beneficial effects: By arranging a plurality of ultrasonic ranging modules at the distal end of the hysteroscope body, the present invention measures the thickness of the uterine wall at the resection site, avoids accidentally causing uterine perforation due to the inability to accurately evaluate the thickness of the uterine wall during the resection of submucous myoma or endometrial polyp of the uterus, improves the safety and accuracy of the operation, reduces the occurrence of complications, and protects the fertility of patients. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a hysteroscopic resectoscope for preventing uterine perforation according to an embodiment provided by the present invention;

[0025] Figure 2 For the present invention Figure 1 The partial enlarged structural diagram of part A;

[0026] Figure 3 It is a schematic structural diagram of a hysteroscopic resectoscope for preventing uterine perforation according to another embodiment provided by the present invention;

[0027] Figure 4 For the present invention Figure 3 The partial enlarged structural diagram of part B;

[0028] Figure 5 For the present invention Figure 3 The partial structural diagram from another perspective;

[0029] Figure 6 It is a partial structural diagram of a hysteroscopic resectoscope for preventing uterine perforation according to still another embodiment provided by the present invention.

[0030] The reference signs in the drawings are: 100, electrosection loop; 110, electrosection part; 200, hysteroscope; 210, hysteroscope body; 211, fixed part; 2111, mounting surface; 2112, transmission hole; 212, movable part; 220, camera; 230, rotating shaft; 231, control end; 300, ultrasonic ranging module. Detailed Embodiments

[0031] The present invention provides a hysteroscopic resectoscope for preventing uterine perforation and its using method. To make the objectives, technical solutions and effects of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0033] It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0035] The following further describes the content of the invention with reference to the accompanying drawings and by way of description of the embodiments.

[0036] This embodiment provides a hysteroscopic resectoscope for preventing uterine perforation and its using method. As Figures 1 to 6 shown, to solve the above technical problems, the technical solutions adopted by the present invention are as follows: including an electrocision loop 100 and a hysteroscope 200. The hysteroscope 200 includes: a hysteroscope body 210, a camera 220 is disposed at the distal end of the hysteroscope body 210, and the camera 220 is oriented towards the resection site;

[0037] a plurality of ultrasonic ranging modules 300, the plurality of ultrasonic ranging modules 300 are disposed at the distal end, and all the plurality of ultrasonic ranging modules 300 are oriented towards the resection site, and the plurality of ultrasonic ranging modules 300 are used to measure the thickness of the uterine wall at the resection site.

[0038] It should be noted that when performing electrotomy of submucous myoma of the uterus, the uterus is filled with normal saline. There are tissues such as air and intestinal canals in the abdominal cavity outside the uterus, and there is an obvious boundary between the outer wall of the uterus and other tissues. The ultrasonic ranging module 300 in the present invention can adopt an ultrasonic probe. In the present invention, the axial ranging ability of the ultrasonic ranging module 300 is mainly utilized to measure the positions (boundaries) of the inner wall and the outer wall of the uterus at the electrotomy site, so as to obtain the thickness of the uterine wall. It has a relatively high requirement for its axial resolution (longitudinal resolution), while having a very low requirement for its lateral resolution (transverse resolution). Therefore, compared with ordinary ultrasonic probes, its volume is greatly reduced.

[0039] In the B-ultrasound image display, the axial resolution (longitudinal resolution) refers to the minimum distance that can distinguish two echo targets in the B-ultrasound image display along the direction of the sound beam axis (towards the electrotomy site in the present invention). The smaller this value is, the clearer the stratification of the longitudinal interface on the sonogram. For continuous ultrasonic waves, the achievable theoretical resolution is equal to half of the wavelength. Therefore, the higher the frequency, the better the resolution. In the present invention, the ultrasonic ranging module 300 is mainly used to measure the thickness of the uterine wall at the electrotomy site, so as to avoid accidentally causing uterine perforation due to the inability to accurately evaluate the thickness of the uterine wall when performing electrotomy of submucous myoma of the uterus or endometrial polyps, and it is not necessary to very accurately obtain the thickness of the uterine wall at the electrotomy site. Therefore, under the condition of permission, the frequency of the ultrasonic ranging module 300 can be reduced to improve the penetration of the ultrasonic ranging module 300, reduce the power of the ultrasonic ranging module 300, and greatly reduce the volume of the ultrasonic ranging module 300.

[0040] Specifically, when performing electrotomy of submucous myoma of the uterus, the measured thickness of the uterine wall is the thickness of the uterine wall along the direction of the sound beam axis of the ultrasonic ranging module 300, rather than the minimum thickness of the uterine wall at the electrotomy site. Therefore, by setting a plurality of ultrasonic ranging modules 300 and making the orientations of the plurality of ultrasonic ranging modules 300 different, but all towards the electrotomy site, the safety can be greatly improved.

[0041] Preferably, the hysteroscope body 210 has a proximal end opposite to the distal end. During actual use, by moving the electrotomy part of the electrotomy loop 100 towards the proximal end, the electrotomy part can be made flush with the ultrasonic ranging module 300. At this time, the ultrasonic ranging module 300 can be directly in contact with the inner wall of the uterus to measure the thickness of the uterine wall. It should be noted that under this implementation, a contact probe can be adopted to further reduce the size of the ultrasonic ranging module 300 (such as the Olympus NDT contact probe of models M208 - RM and M208 - SM, whose diameter is only 3mm. This model is only for illustrative purposes, and the actual situation can be selected according to actual needs).

[0042] In one embodiment, the hysteroscope 200 further includes: an alarm (not shown in the figure), which is respectively connected to several ultrasonic ranging modules 300. The alarm is used to give an alarm when the thickness of the uterine wall at the electrosurgical site is less than a preset thickness.

[0043] Preferably, the alarm can be built into the imaging device of the camera, and the signal lines of the alarm and the ultrasonic ranging module 300 are arranged in the wire channel of the camera. The alarm can also be arranged at one end of the hysteroscope body 210 facing away from the ultrasonic ranging module 300. Without affecting the operation, the alarm can give an alarm in ways such as sound, light, and vibration. The alarm can also be set with a pre-alarm function, that is, by associating the intensity or frequency of sound, light, and vibration with the thickness of the uterine wall at the electrosurgical site measured by the ultrasonic ranging module 300 (when the thickness of the uterine wall at the electrosurgical site is thinner, the intensity of sound, light, and vibration is greater, the frequency of the sound is higher, the flashing frequency of the light is faster, or the vibration frequency is higher, etc.). In addition, when the thickness of the uterine wall at the electrosurgical site is less than the preset thickness, the prompting method of the alarm needs to be different from that of the pre-alarm function, and the difference in the prompt is not limited to different sound types, different light colors, etc.

[0044] When performing the electrosurgical resection of uterine submucous myoma, considering that the thickness of the uterine myometrium is about 0.8 cm when not pregnant, the preset thickness can be set to 1 cm. The alarm gives an alarm when the thickness of the uterine wall at the electrosurgical site is less than 1 cm. Medical staff can evaluate the thickness of the uterine wall, greatly reducing the probability of accidentally puncturing the uterine wall and improving the safety and accuracy of the operation.

[0045] In one embodiment, the frequency of the ultrasonic ranging module 300 is less than 7.5 MHZ. The frequency of existing B-ultrasound probes generally includes 7.5 MHZ. Under permitted conditions, the frequency of the ultrasonic ranging module 300 can be reduced to improve the penetrability of the ultrasonic ranging module 300, reduce the power of the ultrasonic ranging module 300, and greatly reduce the volume of the ultrasonic ranging module 300.

[0046] In one embodiment, as Figures 3 to 6 shown in, the hysteroscope body 210 includes: a fixed part 211, the fixed part 211 has an installation surface 2111 at one end facing the distal end, and several ultrasonic ranging modules 300 are arranged on the installation surface 2111;

[0047] a movable part 212, the movable part 212 is arranged on the installation surface 2111, and the camera 220 is arranged on the movable part 212;

[0048] wherein, the movable part 212 is driven to have a contracted state and an expanded state;

[0049] In the contracted state, the movable part 212 is coaxially arranged with the fixed part 211, and the movable part 212 covers a plurality of ultrasonic ranging modules 300.

[0050] In the deployed state, the movable part 212 is non - coaxially arranged with the fixed part 211, and a plurality of ultrasonic ranging modules 300 are respectively arranged at intervals with the movable part 212.

[0051] Specifically, when performing the electrotomy of uterine submucous myoma, the hysteroscope 200 needs to enter the uterine cavity under the condition of light source visualization. By arranging the camera 220 on the movable part 212, the movable part 212 can enter the uterine cavity first whether it is in the contracted state or the deployed state, so as to meet the surgical requirements.

[0052] During actual use, the movable part 212 can be rotated so that the movable part 212 is in the contracted state. At this time, the movable part 212 is coaxial with the fixed part 211, and the outer diameter of the present invention will not be increased, which is convenient for entering the uterine cavity. After the movable part 212 and a part of the fixed part 211 enter the uterine cavity, the movable part 212 can be rotated again so that the movable part 212 is in the deployed state. At this time, the movable part 212 is non - coaxial with the fixed part 211, and a plurality of ultrasonic ranging modules 300 are exposed. At this time, the camera 220 and a plurality of ultrasonic ranging modules 300 can work simultaneously. In one embodiment, as Figures 3 to 6 shown in, the hysteroscope 200 further includes: a rotating shaft 230, one end of the rotating shaft 230 is rotatably arranged on the fixed part 211, and the other end is fixedly connected with the movable part 212. The rotating shaft 230 is non - coaxially arranged with the fixed part 211. In one embodiment, as Figures 3 to 6 shown in, the hysteroscope 200 further includes: a transmission hole 2112, the transmission hole 2112 is penetrated through the fixed part 211, and the axis of the transmission hole 2112 is parallel to the axis of the fixed part 211. The rotating shaft 230 is rotatably arranged in the transmission hole 2112. Specifically, as Figure 5 and Figure 6 shown in, the rotating shaft 230 and the electro - resection loop 100 are oppositely arranged on the fixed part 211, so that when the movable part 212 is in the deployed state, the movable part 212 is far away from the electro - resection loop 100, avoiding the movable part 212 interfering with the electro - resection loop 100 during the operation.

[0053] Preferably, since the movable part 212 is far away from the electro - resection loop 100 when the movable part 212 is in the deployed state, the orientation of the camera 220 can be set non - parallel to the axis of the fixed part 211 (when the movable part 212 is in the deployed state, the camera 220 is inclined towards the axis of the fixed part 211), so that the camera 220 can better photograph the electro - resection site.

[0054] In one embodiment, as Figure 3As shown in the figure, one end of the rotating shaft 230 away from the movable part 212 forms a control end 231. The control end 231 is driven to rotate to drive the movable part 212 to be in a contracted state or an unfolded state.

[0055] Specifically, the structure of the control end 231 can be the same as that of the control end 231 of the electrocision loop 100. It is located outside the uterine cavity during the electrocision operation of uterine submucous myoma, so as to facilitate the rotation driven by medical staff.

[0056] Preferably, the hysteroscope 200 further includes a first limiting structure, so that the movable part 212 has two predetermined positions (when coaxial with the fixed part 211 and when the distance from the axis of the fixed part 211 is the farthest). The first limiting structure includes an elastic member. When the movable part 212 is in a non-predetermined position, it tends to move towards the nearest predetermined position. It also includes a second limiting structure, which can prevent the rotating shaft 230 from sliding along the axial direction of the fixed part 211. In addition, since the camera 220 needs to transmit signals to the outside, its signal line can be led out from one end of the rotating shaft 230 away from the camera 220. The first limiting structure can limit the rotation angle of the rotating shaft 230 (such as 180 degrees), so as to reduce the bending of the signal line and extend the service life without affecting the use requirements.

[0057] In one embodiment, as Figure 6 shown in the figure, one end of the transmission hole 2112 away from the axis of the fixed part 211 penetrates the fixed part 211, so that the fixed part 211 forms a chute arranged parallel to the axial direction of the fixed part 211. Preferably, the second limiting structure can be unlocked, and through the rotating shaft 230, the movable part 212 can slide along the axial direction of the fixed part 211.

[0058] During actual use, the camera 220 can be made flush with the ultrasonic ranging module 300 by sliding the movable part 212, or the ultrasonic ranging module 300 can protrude from the camera 220. In this state, the ultrasonic ranging module 300 can be in direct contact with the uterine inner wall to measure the thickness of the uterine wall.

[0059] In one embodiment, as Figures 3 to 6 shown in the figure, the outer diameter of the movable part 212 is not less than the outer diameter of the fixed part 211. The installation position of the ultrasonic ranging module 300 can be increased, and a larger-volume ultrasonic ranging module 300 can be set to improve the power of the ultrasonic ranging module 300.

[0060] In one embodiment, as Figure 6 shown in the figure, the electrocision part of the electrocision loop 100 is in the direction away from the fixed part 211 of the movable part 212, and the electrocision part 110 is coaxially arranged with the fixed part 211.

[0061] A method for using a hysteroscopic resectoscope for preventing uterine perforation as described above, comprising the following steps: driving the movable part 212 and making the movable part 212 in a contracted state;

[0062] Moving the movable part 212 and the fixed part 211 to a preset position;

[0063] Driving the movable part 212 and making the movable part 212 in an unfolded state.

[0064] In summary, the present application relates to the technical field of hysteroscopic resectoscopes, and discloses a hysteroscopic resectoscope for preventing uterine perforation and its using method, which includes a hysteroscope body and a plurality of ultrasonic ranging modules. A camera is arranged at the distal end of the hysteroscope body, and the camera is arranged facing the resection site. The plurality of ultrasonic ranging modules are arranged at the distal end, and all the plurality of ultrasonic ranging modules are facing the resection site. The plurality of ultrasonic ranging modules are used to measure the thickness of the uterine wall at the resection site. By arranging a plurality of ultrasonic ranging modules at the distal end of the hysteroscope body, the present invention measures the thickness of the uterine wall at the resection site, avoids accidentally causing uterine perforation due to the inability to accurately evaluate the thickness of the uterine wall during the resection of submucous myoma of the uterus or endometrial polyps, improves the safety and accuracy of the operation, reduces the occurrence of complications, and protects the fertility of patients.

[0065] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hysteroscopic resectoscope for preventing uterine perforation, comprising an electric resection ring and a hysteroscope, characterized in that: The hysteroscope comprises: a hysteroscope body, a camera is arranged at the distal end of the hysteroscope body, and the camera is arranged toward the electroresection site; A plurality of ultrasonic ranging modules are provided at the distal end and all of the ultrasonic ranging modules are directed toward the electroresection site, and the plurality of ultrasonic ranging modules are used to measure the thickness of the uterine wall at the electroresection site.

2. The hysteroscopic resectoscope for preventing uterine perforation according to claim 1, characterized in that: The hysteroscope further comprises: an alarm, which is respectively connected to a plurality of the ultrasonic ranging modules, and is used for sounding an alarm when the thickness of the uterine wall at the electroresection site is less than a preset thickness.

3. The hysteroscopic resectoscope for preventing uterine perforation according to claim 1, characterized in that: The frequency of the ultrasonic ranging module is less than 7.5 MHZ.

4. The hysteroscopic resectoscope for preventing uterine perforation according to claim 1, characterized in that: The hysteroscope body comprises: a fixing part, wherein the fixing part has a mounting surface at one end facing the distal end, and a plurality of ultrasonic distance measuring modules are arranged on the mounting surface; A movable part, wherein the movable part is arranged on the mounting surface, and the camera is arranged on the movable part; Wherein, the movable part is driven to have a contracted state and an expanded state; In the contracted state, the movable part is coaxially arranged with the fixed part, and the movable part covers a plurality of the ultrasonic ranging modules; In the unfolded state, the movable part and the fixed part are arranged non-coaxially, and a plurality of ultrasonic ranging modules are arranged at intervals from the movable part.

5. The hysteroscopic resectoscope for preventing uterine perforation according to claim 4, characterized in that: The hysteroscope further comprises: a rotating shaft, one end of which is rotatably arranged on the fixed part, and the other end of which is fixedly connected to the movable part, and the rotating shaft and the fixed part are non-coaxially arranged.

6. The hysteroscopic resectoscope for preventing uterine perforation according to claim 5, characterized in that: The hysteroscope further comprises: a transmission hole, wherein the transmission hole is arranged through the fixing part, and the axis of the transmission hole is parallel to the axis of the fixing part, and the rotating shaft is rotatably arranged in the transmission hole.

7. The hysteroscopic resectoscope for preventing uterine perforation according to claim 6, characterized in that: One end of the rotating shaft away from the movable part forms a control end, and the control end is driven to rotate to drive the movable part to be in a contracted state or an expanded state.

8. The hysteroscopic resectoscope for preventing uterine perforation according to claim 4, characterized in that: The outer diameter of the movable part is not less than the outer diameter of the fixed part.

9. The hysteroscopic resectoscope for preventing uterine perforation according to claim 4, characterized in that: The electric cutting portion of the electric cutting ring is located in the direction where the movable portion is away from the fixed portion, and the electric cutting portion is coaxially arranged with the fixed portion.

10. A method for using a hysteroscopic resectoscope for preventing uterine perforation according to any one of claims 4 to 9, characterized in that: The steps include: driving the movable portion and placing the movable portion in a contracted state; Moving the movable part and the fixed part to a preset position; The movable portion is driven to be in an extended state.

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