An ultrasonic probe

Abstract

The application relates to the technical field of medical devices, in particular to an ultrasonic probe. The ultrasonic probe comprises an inner sleeve and an outer sleeve with a tubular shell, the tubular shell is a hollow structure with at least one open end, the inner sleeve and the outer sleeve can be inserted into the patient's anal rectum separately or jointly, an ultrasonic transducer is arranged on the inner sleeve or the outer sleeve, the inner sleeve is rotatable and detachably sleeved in the inner chamber of the outer sleeve, the outer periphery of the inner sleeve is in gap cooperation with the inner periphery of the outer sleeve; the corresponding open ends of the inner sleeve and the outer sleeve are provided with a magnetic attraction coupling structure without a lock buckle, the magnetic attraction coupling structure keeps the inner sleeve in the inner chamber of the outer sleeve through magnetic attraction force. In the application, the ultrasonic probe realizes the effect of ultrashort distance and wide angle through the magnetic attraction coupling structure without a lock buckle of the inner and outer sleeves, the taper sleeve structure and the optimized included angle design, the operation distance is shortened to 65 mm, and the "chopstick effect" is avoided.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to an ultrasound probe. Background Technology

[0002] During transanal hemorrhoidal artery ligation under Doppler ultrasound guidance, the hemorrhoidal arteries supplying blood to the hemorrhoids are located using a Doppler diagnostic instrument or examination device. The arteries are then ligated using a needle holder, suture needle, and other auxiliary equipment through the ligation window of the Doppler instrument or examination device. Typically, the ligation site for hemorrhoidal artery ligation is near the dentate line within the anal canal and rectum. Therefore, the distance from the distal end (the end furthest from the anal verge) of the ligation window is generally consistent across different types of Doppler diagnostic instruments or examination devices.

[0003] However, because the power supply lines, control circuits, lighting systems, and other components of the ultrasound probe in traditional cannulated Doppler diagnostic and therapeutic instruments or examination instruments are mounted on the cannula, they are basically supported by a support platform set on the cannula (see Appendix). Figure 1 The aforementioned components are installed on this support platform, which connects the cannula, probe, etc., to the handle (see holder 7 as specified in US20100130857A1). This results in the ultrasound probe being too large outside the anal verge (see Appendix). Figure 1 The longitudinal distance is relatively long, which leads to a longer operating distance (the distance between the outer edge of the ultrasound probe (operating window) and the ligation window). This often requires an extra-long needle holder (such as a 25cm needle holder) to perform hemorrhoidal artery ligation, resulting in a significant "chopstick effect." This requires doctors performing hemorrhoidal artery ligation to have extensive experience, significantly increasing the difficulty of the procedure. Moreover, the relatively large size of the ultrasound probe outside the anal verge also makes it easy to obstruct the view of the ligation window when observing it from the operating window, further increasing the difficulty of the ligation procedure and lengthening the doctor's learning curve. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides an ultrasound probe comprising an inner sleeve and an outer sleeve with a tubular shell. The tubular shell is a hollow structure with an opening at at least one end. The inner sleeve and the outer sleeve can be inserted into the patient's anal canal or rectum individually or jointly. An ultrasound transducer is provided on the inner sleeve or the outer sleeve. The inner sleeve is rotatably and detachably fitted into the internal cavity of the outer sleeve, and the outer circumferential surface of the inner sleeve and the inner circumferential surface of the outer sleeve are in clearance fit. A latchless magnetic coupling structure is provided at the corresponding opening end of the inner sleeve and the outer sleeve. The latchless magnetic coupling structure holds the inner sleeve in the internal cavity of the outer sleeve through magnetic attraction.

[0005] Furthermore, the non-inserted operating openings of the inner and outer sheaths of the patient's anal canal and rectum are each folded outwards to form a conical sleeve structure with an arc transition.

[0006] Furthermore, a lighting system is provided on the side wall of the conical sleeve structure of the inner or outer sleeve along the circumferential direction of the side wall.

[0007] Furthermore, the inner or outer sleeve has a connecting port on its tapered sleeve structure; the lighting system and the ultrasonic transducer are connected to an external power source through the connecting port.

[0008] Furthermore, the angle between the outwardly folded-out end face of the conical sleeve structure and the outer side wall of the inner or outer sleeve is no greater than 135°; more preferably, the angle between the outwardly folded-out end face of the conical sleeve structure and the outer side wall of the inner or outer sleeve is 120-135°.

[0009] Furthermore, the latchless magnetic coupling structure consists of two sets of magnetic components with opposite polarities; or, the latchless magnetic coupling structure consists of a set of magnetic components and a set of magnetically attracted metal components; the magnetic components and the metal components are respectively mounted on the inner sleeve and / or the outer sleeve.

[0010] Furthermore, the outer sleeve and inner sleeve have mounting grooves on their inner or outer sides for mounting components of the latchless magnetic coupling structure.

[0011] Furthermore, the inner side of the tapered sleeve structure of the outer sleeve is provided with an annular mounting groove along its circumference, and a magnetic component or a magnetically attracted metal component is provided in the annular mounting groove of the outer sleeve.

[0012] Furthermore, the inner sleeve has an annular mounting groove along its circumference on the outer side of the tapered sleeve structure, and a magnetic component or a magnetically attracted metal component is disposed in the annular mounting groove.

[0013] Furthermore, the magnetic component or the magnetically attracted metal component in the annular mounting groove of the outer sleeve is embedded and sealed in the annular mounting groove of the outer sleeve by a suitable annular cover plate of the outer sleeve; the magnetic component or the magnetically attracted metal component in the annular mounting groove of the inner sleeve is embedded and sealed in the annular mounting groove of the inner sleeve by a suitable annular cover plate of the inner sleeve.

[0014] Furthermore, the outer sleeve annular cover plate and the inner sleeve annular cover plate are respectively provided with sawtooth groove structures with tooth shape and tooth pitch adapted to each other. The sawtooth groove structures are arranged horizontally along the circumference of the tubular shell or vertically along the axial direction. The sawtooth groove structure is configured to make the inner sleeve and the outer sleeve rotate coaxially relative to each other by external force, and at the same time fix the inner sleeve and the outer sleeve relative to each other when there is no external force.

[0015] Furthermore, the straight section of the outer sheath is provided with a longitudinally extending ligation window on its sidewall, through which tissue suturing can be performed; the ligation window includes a longitudinally extending sidewall end and a distal end near the anal canal and rectal insertion end, and the sidewall end and the arc-shaped connection portion extend at least partially into the ligation window in the circumferential direction to form a window extension end.

[0016] Furthermore, the edge of the window extension is folded towards the internal cavity of the outer sleeve to form a protruding structure.

[0017] Compared with existing related technologies and products, the ultrasound probe provided in this application has the following advantages: Compared with the traditional sheath-type Doppler diagnostic and therapeutic instruments or examination instruments with an operating distance of up to 105mm, this application achieves an ultra-short distance wide-angle effect through the non-locking magnetic coupling structure of the inner and outer sheaths, the conical sleeve structure, and the optimized angle design, shortening the operating distance to 65mm and avoiding the "chopstick effect." Moreover, compared with traditional diagnostic and therapeutic instruments or examination instruments that require the use of a 25cm needle holder, the probe of this application can use a 20cm needle holder, significantly expanding the compatibility range of various needle holders and reducing the difficulty of operation. In addition, the lighting system and concealed wiring layout of this application improve the clarity of the field of vision and reduce visual obstruction; the non-locking magnetic coupling structure and the sawtooth groove enable convenient rotation positioning and separation, improving operational efficiency; the extended end design of the ligation window solves the problem of blind spots in the field of vision and improves the accuracy of ligation. These improvements significantly reduce the operating threshold for doctors, shorten the learning curve, and improve the safety and effectiveness of hemorrhoidal artery ligation. Attached Figure Description

[0018] To further explain the structure and construction of the ultrasonic probe in this application, corresponding drawings are provided. It should be noted that the drawings described in this application are only individual examples selected from all the drawings and are not intended to limit the claims. All other corresponding atlases obtained through the drawings provided in this application fall within the scope of protection of this application.

[0019] Appendix Figure 1 A schematic diagram of the structure of an existing Doppler diagnostic and therapeutic instrument.

[0020] Appendix Figure 2 This application provides a schematic diagram of the exploded structure of the inner and outer sleeves of the ultrasonic probe.

[0021] Appendix Figure 3 A schematic diagram of the cross-sectional view of the inner and outer sleeve assembly in the ultrasonic probe of this application.

[0022] Appendix Figure 4 This application provides a schematic diagram of the exploded structure of the outer sheath of the ultrasonic probe.

[0023] Appendix Figure 5 This application provides a schematic diagram of the exploded structure of the inner sleeve in the ultrasonic probe.

[0024] Appendix Figure 6 A schematic diagram of the sawtooth groove structure of the inner sleeve in the ultrasonic probe of this application.

[0025] Appendix Figure 7 A schematic diagram of the sawtooth groove structure of the outer sleeve in the ultrasonic probe of this application.

[0026] Appendix Figure 8 This application provides schematic diagrams showing the different positions of the serrated groove structure in the outer sleeve of the ultrasonic probe.

[0027] Appendix Figure 9 This application provides schematic diagrams showing the different positions of the serrated groove structure in the inner sleeve of the ultrasonic probe.

[0028] Appendix Figure 10 A schematic diagram of the window extension end structure of the outer sheath in the ultrasonic probe of this application.

[0029] Appendix Figure 11 A schematic diagram of the edge of the ligation window as seen from the operating window of the ultrasound probe in this application.

[0030] Among them: 11 needle holder, 12 operating window, 13 ligation window, 14 operating distance, 15 anal verge position, 16 support platform, 100 inner cannula, 200 outer cannula, 201 conical sleeve structure, 101 lamp plate, 102 lamp plate mounting groove, 103 connection port, 104 inner cannula annular mounting groove, 105 N pole magnetic ring, 204 outer cannula annular mounting groove, 205 S pole magnetic ring, 206 outer cannula annular cover plate, 106 inner cannula annular cover plate, 1061 inner cannula serrated groove structure, 2061 outer cannula serrated groove structure, 213 outer cannula ligation window, 2131 side wall end, 2132 distal end, 2133 extension end, 2134 protruding structure. Detailed Implementation

[0031] The present application will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present application, and therefore only show the components relevant to the present application.

[0032] See appendix Figure 2The ultrasound probe provided in this application includes an inner sheath 100 and an outer sheath 200, both having tubular shells. The tubular shells are hollow structures with at least one open end; that is, the tubular shells of both the inner sheath 100 and the outer sheath 200 can be independently open at one end or open at both ends. The inner sheath 100 and the outer sheath 200 can be inserted into the patient's anal canal and rectum individually or jointly. The outer diameter of the inner sheath 100 and the outer sheath 200 generally does not exceed 6 cm, preferably 3-6 cm. The length of the tubular shell portion inserted into the patient's anal canal and rectum generally does not exceed 25 cm, preferably 6-20 cm, conforming to the physiological structure of the human body under anesthesia. The specific dimensions can be adjusted accordingly based on the needs of those skilled in the art. An ultrasound transducer is provided on the tubular shell of the inner sheath 100 or the outer sheath 200, preferably installed at the end of the inner sheath or the outer sheath inserted into the patient's anal canal and rectum. It can be connected to the interface on the conical sleeve structure via a wire in a groove embedded in the side wall of the inner sheath or the outer sheath. The ultrasonic transducer can emit ultrasonic waves of a specific frequency and receive the echoes, converting them into electrical signals to locate blood vessel positions and blood flow speeds. It employs ultrasonic transducers (e.g., ultrasonic transducers with an emission frequency of approximately 8.2 MHz) or similar ultrasonic probes and other instruments well-known to those skilled in the art.

[0033] To facilitate the insertion of the ultra-short-range wide-angle ultrasound probe into the patient's anal canal and rectum, preferably, at least one of the inner cannula 100 and the outer cannula 200 is configured with a tubular shell that is open at one end and closed at the other. The open end serves as the operating window, and the closed end is used for insertion into the patient's anal canal and rectum. When both ends of the outer cannula 200 are open, one end of the inner cannula 100 is closed, and this closed port extends beyond the open end of the outer cannula 200, serving as the end for insertion into the patient's anal canal and rectum. An ultrasound transducer can be installed on the side wall of the inner cannula 100 or the outer cannula 200 to locate the target blood vessel. The operator can use auxiliary instruments such as a needle holder to perform suturing, ligation, and other operations at the port equipped with the ultrasound transducer through the operating opening of the inner and outer cannulas.

[0034] The inner sleeve 100 is rotatably and detachably fitted into the internal cavity of the outer sleeve 200. The outer circumferential surface of the inner sleeve 100 and the inner circumferential surface of the outer sleeve 200 are in clearance fit. In this application, there are no special requirements or limitations on the clearance value of the clearance fit, as long as it is adapted to the assembly requirements of the medical device. For example, the clearance value can be 0.1-0.5mm. The corresponding opening end of the inner sleeve 100 and the outer sleeve 200 is provided with a latchless magnetic coupling structure. Preferably, it is set on the operating end that is not inserted into the patient's anal canal or rectum. The latchless magnetic coupling structure holds the inner sleeve 100 in the internal cavity of the outer sleeve 200 by magnetic attraction. More preferably, the magnitude of the magnetic attraction force is set such that the inner sleeve 100 and the outer sleeve 200 can rotate relatively coaxially, while the inner sleeve 100 and the outer sleeve 200 can be separated by external force.

[0035] Referring to Figure 3, in this application, the non-insertion openings of the inner sleeve 100 and outer sleeve 200 of the patient's anal canal and rectum are each folded outwards at a certain angle, extending together to form a conical sleeve structure 201 with a smooth arc transition. Preferably, the outward folding angles of the inner sleeve 100 and outer sleeve 200 are the same. This conical sleeve structure 201 expands outwards through a smooth arc transition, effectively increasing the operator's field of vision for observing the internal chamber from the operating window. It also avoids the "chopstick effect" caused by the protruding structure in traditional equipment, i.e., the instability problem of instruments such as ultra-long needle holders during operation, making suturing, ligation, and other operations more convenient. This application does not impose a special limitation on the arc transition dimension of the conical sleeve structure; it can be adjusted according to dimensions known to those skilled in the art, for example, a transition radius of 5-10 mm can be used. Furthermore, the angle α between the outwardly folded-out end face of the conical sleeve structure 201 and the outer sidewall of the inner sleeve 100 or outer sleeve 200 is no greater than 135°; in some embodiments, the angle α is preferably 120°-135° (e.g., 125°, 130°). This angle range design maximizes the reduction of the operating distance (i.e., the longitudinal distance between the operating window and the ligation window, see Appendix) while ensuring comfort and fit when inserted into the human anal canal and rectum. Figure 1 The operating distance marked 14 is increased, the operating angle is widened, the line of sight is reduced, and the operating difficulty is significantly reduced.

[0036] See appendix Figure 5In this application, an illumination system is provided on the side wall of the conical sleeve structure 201 of the inner sleeve 100 or the outer sleeve 200, along the circumferential direction of the conical sleeve structure. The illumination system may be a ring-shaped lamp panel 101 (LED), which is installed in the lamp panel mounting groove 102 inside the conical sleeve structure 201, and can uniformly illuminate the internal cavity of the sleeve, so that the operator can clearly observe all areas that need to be operated, including the hemorrhoidal artery location near the dentate line.

[0037] To further address the issues of power supply lines occupying space and obstructing vision in traditional equipment, a connection port 103 is provided on the conical sleeve structure 201 of the inner sleeve 100 or outer sleeve 200, preferably located in a non-visual area of ​​the conical sleeve structure 201. The power supply lines of the lighting system and the signal lines of the ultrasonic transducer can both be connected to an external power source through this connection port 103. The ultrasonic transducer is also connected to an external ultrasonic diagnostic device via this connection port. Preferably, the lines are arranged along the outer side or inner groove of the conical sleeve structure 201, and do not protrude from the inner or outer wall surface of the conical sleeve structure, avoiding protrusions or obstructions in the area between the operating window and the ligation window, further shortening the operating distance and optimizing the field of vision.

[0038] See appendix Figure 4 and attached Figure 5In this application, the latchless magnetic coupling structure is used to achieve a detachable and rotatable connection between the inner sleeve 100 and the outer sleeve 200. In some embodiments, the latchless magnetic coupling structure consists of two sets of magnetic components with opposite polarities. For example, an N-pole magnetic ring 105 is provided in the inner sleeve annular mounting groove 104 of the inner sleeve 100, and an S-pole magnetic ring 205 is provided in the outer sleeve annular mounting groove 204 of the outer sleeve 200; or, an S-pole magnetic ring is provided in the inner sleeve annular mounting groove 104 of the inner sleeve 100, and an N-pole magnetic ring is provided in the outer sleeve annular mounting groove 204 of the outer sleeve 200, achieving coupling through the attraction of opposite poles. In some preferred embodiments, the latchless magnetic coupling structure consists of a set of magnetic components and a set of magnetically attracted metal components. For example, a neodymium iron boron magnet is disposed in the annular mounting groove 104 of the inner sleeve 100, and an iron-nickel alloy ring is disposed in the annular mounting groove 204 of the outer sleeve 200; or, an iron-nickel alloy ring is disposed in the annular mounting groove 104 of the inner sleeve 100, and a neodymium iron boron magnet is disposed in the annular mounting groove 204 of the outer sleeve 200, achieving coupling through magnetic attraction. This embodiment can significantly reduce costs and simplify assembly. The magnetic force of the magnetic component or the magnetically attracted metal component is optimized to both stably hold the inner sleeve 100 in the internal cavity of the outer sleeve 200 through magnetic attraction, and allow the inner sleeve 100 to rotate coaxially with the outer sleeve 200 under the action of external force, while also being able to separate the two by applying axial tension (for example, the operator can achieve separation by holding the operating window end of the inner sleeve 100 and pulling it outward). For example, the magnetic force of the neodymium iron boron magnetic ring can be set to 5-25N.

[0039] See appendix Figure 4 Appendix Figure 5 In some embodiments of this application, an annular mounting groove 204 is provided on the inner side of the conical sleeve structure 201 of the outer sleeve 200 along the circumferential direction of the conical sleeve structure 201, and an annular mounting groove 104 is provided on the outer side of the conical sleeve structure of the inner sleeve 100 along the circumferential direction of the conical sleeve structure. Preferably, the depth and width of the annular mounting groove are adapted to the size of the magnetic component / magnetized metal component. The magnetic component or the magnetized metal component 105 is installed in the annular mounting groove and then sealed by the adapted outer sleeve annular cover plate 206 or inner sleeve annular cover plate 106. The sealing design of the annular cover plate (including the outer sleeve annular cover plate 206 and the inner sleeve annular cover plate 106) can not only fix the magnetic component and prevent it from shifting or falling off, but also prevent the magnetic component or the magnetized metal component from directly contacting human tissue, thus improving biosafety. At the same time, the embedded design of the mounting groove and the annular cover plate does not increase the radial dimension of the device, thereby avoiding obstruction of vision or extension of the operating distance.

[0040] See appendix Figure 7-8In some embodiments of this application, the outer sleeve annular cover plate 206 and the inner sleeve annular cover plate 106 are provided with serrated groove structures (inner sleeve serrated groove structure 1061, outer sleeve serrated groove structure 2061) that fit with a clearance fit. These are arranged horizontally along the circumferential direction of the tubular shell. When the inner sleeve 100 is assembled into the inner cavity of the outer sleeve 200, the inner sleeve 100 and the outer sleeve 200 are relatively fixed due to magnetic attraction. At this time, the inner sleeve serrated groove structure 1061 is above the outer sleeve serrated groove structure 2061, and the two are in a clearance fit. See Appendix Figure 8 and attached Figure 9 In some embodiments, a sawtooth groove structure 2061 for the outer sleeve is provided on the inner side wall of the conical sleeve structure 201 connected to the upper side of the outer sleeve annular cover plate 206; correspondingly, a sawtooth groove structure 1061 for the inner sleeve is provided on the outer side wall of the conical sleeve structure connected to the lower side of the inner sleeve annular cover plate 106. It is arranged vertically along the circumferential direction of the tubular shell. When the inner sleeve 100 is assembled in the inner cavity of the outer sleeve 200, the inner sleeve 100 and the outer sleeve 200 are relatively fixed due to magnetic attraction. At this time, the sawtooth groove structure 1061 of the inner sleeve is inside the sawtooth groove structure 2061 of the outer sleeve, and the two are in clearance fit. The tooth shape and pitch of the sawtooth groove structure of the inner and outer sleeves are adapted to each other. Through the combined effect of friction and magnetic attraction of the sawtooth groove structure, the inner sleeve 100 and the outer sleeve 200 are kept relatively fixed. The tooth shape, pitch, and other parameters of the sawtooth groove can be adjusted according to actual needs. For example, a triangular tooth shape with a tooth pitch of 1-3mm can be used, and the clearance value in the clearance fit can be 0.1-0.8mm. When the operator applies circumferential rotational force (e.g., rotating the inner sleeve 100 to adjust the detection angle of the ultrasonic transducer), the clearance fit of the sawtooth groove allows the two to rotate coaxially relative to each other. After rotation to the correct position, they can automatically maintain the current position without the need for an additional locking structure, significantly improving the convenience of operation and positioning accuracy.

[0041] See appendix Figure 10 In some preferred embodiments of this application, a longitudinally extending ligation window 213 is provided on the side wall of the outer sleeve 200 (attached). Figure 11 (The marked ligation window) allows the operator to perform suturing and ligation of the hemorrhoidal artery.

[0042] In some preferred embodiments of this application, the outer sheath ligation window 213 includes a longitudinally extending sidewall end 2131 and a distal end 2132 (i.e., the end closer to the inside of the anal canal and rectum) away from the latchless magnetic coupling structure. To solve the problem that it is difficult for operators to determine the position of the edge of the ligation window in conventional devices, in this application, the portion where the sidewall end 2131 and the distal end 2132 are connected extends at least partially into the outer sheath ligation window 213 in the circumferential direction to form a window extension end 2133.

[0043] More preferably, the edge of the window extension 2133 folds towards the internal cavity of the outer sleeve 200 to form a protruding structure 2134. This protruding structure 2134 can form a clear visual marker in the operator's field of vision, allowing the operator to operate from the window (attached). Figure 11 The distal edge of the ligation window (marked at 12 operation windows) can be clearly identified, especially the ligation position near the serrated line, avoiding blind spots and improving the accuracy and safety of the ligation operation.

[0044] Overall operating procedure: Based on the structural design of this application, the typical operating procedure for the ultra-short-range wide-angle ultrasonic probe is as follows:

[0045] Assembly preparation: Insert the inner sleeve 100 into the internal cavity of the outer sleeve 200, and achieve adsorption and fixation through the latchless magnetic coupling structure. At this time, the serrated groove structure maintains the initial positioning; connect the external host through the interface and turn on the power.

[0046] Insertion and positioning: The assembled probe is inserted into the patient's anal canal and rectum. The arc of the conical sleeve structure is adapted to the human tissue, and the ultrasonic transducer detects the location of the hemorrhoidal artery.

[0047] Angle Adjustment: If the ultrasonic detection angle needs to be adjusted, the operator can rotate the inner sleeve 100°. The serrated groove structure allows coaxial rotation and maintains the adjusted position.

[0048] Ligation procedure: The operator holds the needle through the operating window and sutures and ligates the hemorrhoidal artery through the ligation window. The protruding structure at the extended end of the window helps to determine the ligation position.

[0049] Equipment separation: After the operation is completed, apply axial tension to separate the inner sleeve 100 from the outer sleeve 200, and remove them or perform subsequent processing.

[0050] Finally, it should be noted that the above description is only a part of the preferred embodiments of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An ultra-short-range wide-angle ultrasound probe, comprising an inner tube and an outer tube having a tubular shell, the tubular shell being a hollow structure open at at least one end, the inner tube and the outer tube being insertable individually or jointly into the anal canal and rectum of a patient, and an ultrasound transducer being disposed on the inner tube or the outer tube, characterized in that, The inner sleeve is rotatably and detachably fitted into the inner cavity of the outer sleeve, with the outer circumferential surface of the inner sleeve and the inner circumferential surface of the outer sleeve having a clearance fit; one end of the corresponding opening of the inner sleeve and the outer sleeve is provided with a latchless magnetic coupling structure, which holds the inner sleeve in the inner cavity of the outer sleeve by magnetic attraction; a longitudinally extending ligation window is provided on the side wall of the straight section of the outer sleeve; the ligation window includes a longitudinally extending side wall end and a distal end near the anal canal and rectal insertion end, and the arc-shaped connection between the side wall end and the distal end extends at least partially into the ligation window in the circumferential direction to form a window extension end; The edge of the window extension is folded towards the inner cavity of the outer sleeve to form a protruding structure.

2. The ultrasonic probe according to claim 1, characterized in that, The non-insertion openings of the inner and outer sheaths of the patient's anal canal and rectum are each folded outwards to form a conical sleeve structure with an arc transition.

3. The ultrasonic probe according to claim 2, characterized in that, A lighting system is provided on the side wall of the conical sleeve structure of the inner or outer sleeve along the circumferential direction of the side wall.

4. The ultrasonic probe according to claim 3, characterized in that, The inner or outer sleeve has a connecting port on its tapered sleeve structure; the lighting system and the ultrasonic transducer are connected to an external power source through the connecting port.

5. The ultrasonic probe according to claim 2, characterized in that, The angle between the outwardly folded end face of the conical sleeve structure and the outer side wall of the inner or outer sleeve is no greater than 135°.

6. The ultrasonic probe according to any one of claims 1-5, characterized in that, The latchless magnetic coupling structure consists of two sets of magnetic components with opposite polarities; or, the latchless magnetic coupling structure consists of a set of magnetic components and a set of magnetically attracted metal components; the magnetic components and the metal components are respectively mounted on the inner sleeve and / or the outer sleeve.

7. The ultrasonic probe according to claim 6, characterized in that, The outer sleeve and inner sleeve have mounting grooves on their inner or outer sides for mounting components of the latchless magnetic coupling structure.

8. The ultrasonic probe according to claim 7, characterized in that, The inner side of the tapered sleeve structure of the outer sleeve is provided with an annular mounting groove along its circumference, and a magnetic component or a magnetically attracted metal component is provided in the annular mounting groove of the outer sleeve.

9. The ultrasonic probe according to claim 8, characterized in that, The inner sleeve has an annular mounting groove along its circumference on the outer side of the tapered sleeve structure, and a magnetic component or a magnetically attracted metal component is provided in the annular mounting groove.

10. The ultrasonic probe according to claim 9, characterized in that, The magnetic component or the magnetically attracted metal component in the annular mounting groove of the outer sleeve is embedded and sealed in the annular mounting groove of the outer sleeve by a suitable annular cover plate; the magnetic component or the magnetically attracted metal component in the annular mounting groove of the inner sleeve is embedded and sealed in the annular mounting groove of the inner sleeve by a suitable annular cover plate.

11. The ultrasonic probe according to claim 10, characterized in that, The outer sleeve annular cover plate and the inner sleeve annular cover plate are respectively provided with sawtooth groove structures with tooth shape and tooth pitch adapted to each other. The sawtooth groove structures are arranged horizontally along the circumference of the tubular shell or vertically along the axial direction. The sawtooth groove structure is configured to make the inner sleeve and the outer sleeve rotate coaxially relative to each other by external force, and at the same time fix the inner sleeve and the outer sleeve relative to each other when there is no external force.

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