CN120604970A - Endoscope - Google Patents

Abstract

The invention relates to the technical field of medical instruments, in particular to an endoscope, which comprises an insertion mechanism and a handle mechanism, wherein the insertion mechanism is arranged on the handle mechanism, the insertion mechanism comprises an imaging assembly, a front guide sleeve and an insertion tube, one end of the imaging assembly is movably arranged on the front guide sleeve, the front guide sleeve is used for wrapping part of the imaging assembly, the lateral outline of the front guide sleeve is completely flush with the outline of the imaging assembly when the front guide sleeve is wrapped on the imaging assembly, the insertion tube is provided with a first tube cavity and a second tube cavity, the first tube cavity is used for a working instrument to pass through an instrument channel extending into uterus, and the imaging assembly is lifted up and partially separated from the front guide sleeve when the working instrument penetrates out from a distal end port of the insertion tube. The movable imaging component is arranged in the insertion mechanism of the endoscope, the imaging component is wrapped in the front guide sleeve to form an insertion end with a smaller diameter during insertion, and the imaging component is lifted when a working instrument passes through after insertion, so that the working instrument can be used normally, the use is convenient, and the operation efficiency can be effectively improved.

Description

Endoscope with a lens

Technical Field

The invention relates to the technical field of medical instruments, in particular to an endoscope.

Background

The endoscope is used as a medical diagnosis instrument, can enter the human body through a natural cavity or a minimally invasive hole of the human body, and can shoot images of focus through a camera encapsulated at the far end of the endoscope, so that sufficient diagnosis information and treatment scheme are provided for doctors. The endoscope is increasingly applied to modern minimally invasive surgery, the uterine cavity endoscope is one of the endoscopes, the uterine cavity endoscope is used for checking the interior of the uterine cavity, when the endoscope is used, the front part of the lens enters the uterine cavity, the lens of the uterine cavity endoscope can amplify and observe the position in the uterine cavity, the endoscope is precisely measured, the abdomen opening is not needed, the diagnosis is more accurate, the diagnosis accuracy is obviously improved, and the uterine cavity endoscope is a preferred checking instrument for gynecological hemorrhagic diseases and intrauterine lesions from the checking point of view.

In the using process of the uterine cavity endoscope, the uterine cavity endoscope is limited by the narrow using environment of the cervical and oral passages of a human body, the insertion part with a larger caliber can have larger friction with human tissues, the passing is blocked, the pain uncomfortable feeling of a patient is increased, meanwhile, the in-vivo mucous membrane injury can be caused, the treatment is not facilitated, and even the risk of secondary injury can be caused. Therefore, the outer diameter of the insertion portion of the intrauterine endoscope must be maintained at a certain size, while the insertion portion of the endoscope is the execution end of the endoscope, and it is necessary to provide an illumination LED or a light guide beam, a camera module, a flushing and treatment instrument channel tube, etc., which are all disposed in the insertion portion, and an insertion portion having a large inner diameter is necessary.

Therefore, there is a need for an endoscope having an insertion portion that can smoothly pass through a narrowed cervical canal of a human body, avoid secondary injuries, and reasonably dispose various devices.

Disclosure of Invention

Therefore, the invention aims to provide an endoscope, wherein a movable imaging component is arranged in an insertion mechanism, the imaging component is wrapped in a front guide sleeve to form an insertion end with a smaller diameter during insertion, and the imaging component is lifted when a working instrument passes through after insertion, so that the working instrument can be used normally, the endoscope is convenient to use, and the operation efficiency can be effectively improved.

The invention solves the technical problems by the following technical means:

The invention provides an endoscope, which comprises an insertion mechanism and a handle mechanism, wherein the insertion mechanism is arranged on the handle mechanism, the insertion mechanism comprises an imaging assembly, a front guide sleeve and a cannula, one end of the imaging assembly is movably arranged on the front guide sleeve, the front guide sleeve is used for wrapping part of the imaging assembly and limiting the movement of the imaging assembly, and when the front guide sleeve is wrapped on the imaging assembly, the lateral outer contour of the front guide sleeve is completely flush with the lateral outer contour of the imaging assembly;

The cannula has a first lumen extending from a proximal port portion of the cannula to a distal port portion of the cannula and a second lumen, the first lumen being located within the second lumen, the first lumen being for passage of a working instrument through an instrument channel extending into the uterus, the second lumen being for passage of an FPC flat cable, the front guide sleeve being mounted at the distal port portion of the cannula, the imaging assembly being lifted and partially disengaged from the front guide sleeve when the working instrument is threaded out of the distal port of the cannula.

In some embodiments, a spring is connected between the imaging assembly and the cannula, the spring being used to control the imaging assembly to reset.

In some embodiments, a first support sleeve is mounted inside the distal end of the cannula, the first support sleeve has a spring slot thereon, one end of the spring is embedded in the spring slot, and the other end is mounted on the imaging assembly.

In some embodiments, the first support sleeve further has a wire-traversing groove thereon, the wire-traversing groove in communication with the second lumen.

In some embodiments, the other end of the imaging assembly protrudes beyond the corresponding end of the front guide sleeve.

In some embodiments, the front guide sleeve has a mounting groove near one end of the cannula, the mounting groove is disposed obliquely, and the imaging assembly has a connecting post at a position corresponding to the mounting groove, and the connecting post is located in the mounting groove.

In some embodiments, the cannula comprises an inner tube and an outer tube, the outer tube being sleeved on the inner tube, and the inner tube and the outer tube being arranged eccentrically, a gap between the inner tube and the outer tube constituting the second lumen, a hollow interior of the inner tube constituting the first lumen.

In some embodiments, the handle mechanism includes a housing, a sleeve within the housing, a proximal end of the outer tube within the sleeve, a proximal end of the inner tube extending out of the sleeve and connected to a drive mechanism for controlling limited rotation of the cannula.

In some embodiments, the sleeve is provided with a water injection connecting pipe and a water pumping connecting pipe, the water inlet end of the water injection connecting pipe is connected with a water injection pipe, the water outlet end of the water injection connecting pipe is communicated with the second pipe cavity, the water inlet end of the water pumping connecting pipe is communicated with the first pipe cavity, and the water outlet end of the water pumping connecting pipe is communicated with the water pumping pipe.

In some embodiments, the water injection pipe has a hydraulic sensor mounted thereon.

In some embodiments, the driving mechanism comprises a knob and a stop collar, the proximal end of the inner tube is fixed in the stop collar, the knob rotates to drive the stop collar to rotate, a plurality of stop slots distributed along the circumferential equidistance are formed in the outer wall of the stop collar, steel ball blind holes are formed in the inner wall of the outer shell, movable steel balls are arranged in the steel ball blind holes, and the steel balls are clamped in one of the stop slots.

In some embodiments, a spring is connected between the steel ball and the steel ball blind hole.

In some embodiments, the side wall of the limit collar further has a limit bump, and the inner wall of the housing has a limit stop for limiting the circumferential unrestricted rotation of the limit bump.

In some embodiments, the proximal end of the inner tube is sleeved with a support tube, one end of the support tube is inserted into the sleeve, and the other end of the support tube is inserted into the limit sleeve.

In some embodiments, an eccentric tube is installed between the sleeve and the outer tube, and the eccentric tube is fixedly sleeved on the outer tube.

In the endoscope, during the whole process of inserting the cannula into the uterus, the imaging component part is wrapped in the front guide sleeve, the radial dimension of the insertion end part of the cannula is smaller at the moment so as to smoothly enter the uterus, and the side outer contour of the front guide sleeve is completely flush with the side outer contour of the imaging component, so that secondary injury caused by injury to surrounding tissues is avoided. When the working device enters the uterus for operation, the imaging component is ejected out to be partially separated from the front guide sleeve by the working device when the working device enters the distal end of the cannula from the first lumen, the working device can smoothly penetrate out of the cannula for operation, and the imaging component is reset into the front guide sleeve when the working device exits. Thus, the problem that the insertion of the working instrument requires a cannula with a larger size is solved, the cannula is convenient to use, and the operation efficiency can be effectively improved.

Drawings

FIG. 1 is a schematic view of an imaging assembly in an endoscope in a state of being wrapped in a front guide sleeve;

FIG. 2 is an enlarged view at C in FIG. 1;

FIG. 3 is a view in the A-A direction of FIG. 1;

FIG. 4 is an enlarged view at D in FIG. 3;

Fig. 5 is an enlarged view at E in fig. 3;

FIG. 6 is a view in the B-B direction of FIG. 1;

FIG. 7 is a schematic view of the structure of the endoscope with the lifted portion of the imaging assembly disengaged from the front guide sleeve;

Fig. 8 is an enlarged view at F in fig. 7;

FIG. 9 is a schematic cross-sectional view of FIG. 7;

fig. 10 is an enlarged view at G in fig. 9;

fig. 11 is an enlarged view at H in fig. 9;

FIG. 12 is an enlarged schematic view of the drive mechanism;

FIG. 13 is an enlarged schematic view of the front guide sleeve;

FIG. 14 is an enlarged schematic view of the imaging assembly;

FIG. 15 is a cross-sectional view of the sleeve;

FIG. 16 is an enlarged schematic view of the first support sleeve;

FIG. 17 is an enlarged schematic view of the second support sleeve;

Wherein, the front guide sleeve 110, the mounting sleeve 111, the limiting plate 112, the insertion tube 120, the inner tube 121, the outer tube 122, the round hole 1221 module 131, the lens holder 132, the connecting post 1321, the LED lamp 133, the spring plate 140, the first supporting sleeve 151, the spring plate slot 1511, the flat wire passing slot 1512, the second supporting sleeve 152, the flat square 1521,

The device comprises a shell 210, a clamping ring 211, a steel ball blind hole 212, a steel ball 213, a spring 214, a limit stop 215, a sleeve 220, a clamping groove 221, a wire arrangement hole 222, a water injection connecting pipe 223, a water pumping connecting pipe 224, a knob 231, a limit sleeve 232, a limit groove 2321, a limit protrusion 2322, a supporting pipe 240, a sealing seat 250, a water injection connecting pipe,

Eccentric pipe 300, stainless steel sleeve 400, water injection pipe 500, water pumping pipe 600, and hydraulic pressure sensor 700.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-17, the endoscope of the present embodiment includes an insertion mechanism and a handle mechanism, the insertion mechanism being mounted on the handle mechanism. The insertion mechanism is used to mount the imaging assembly and pass through the cervix and into the interior of the uterine cavity. The insertion mechanism comprises an imaging assembly 130, a front guide sleeve 110 and a cannula 120, wherein one end of the imaging assembly 130 is movably arranged on the front guide sleeve 110, the imaging assembly 130 is provided with a mounting end and a free end, the mounting end of the imaging assembly 130 is always arranged on the front guide sleeve 110, and the free end of the imaging assembly can move in a direction away from the front guide sleeve 110 or close to the front guide sleeve 110. The front guide sleeve 110 is used for wrapping part of the imaging assembly 130 and limiting the movement of the imaging assembly 130, and when the front guide sleeve 110 is wrapped on the imaging assembly 130, the lateral outer contour of the front guide sleeve 110 is completely flush with the lateral outer contour of the imaging assembly 130. Cannula 120 is an elongate, tubular member, and cannula 120 is sized to pass through the cervix and into the uterus. Cannula 120 has a first lumen and a second lumen extending from a proximal port portion of cannula 120 to a distal port portion of cannula 120, in this embodiment, the distal end of cannula 120 refers to the end of cannula 120 extending into the uterus, and the proximal end of cannula 120 refers to the end of cannula 120 facing away from the distal end. The first lumen is located within the second lumen for passage of a working instrument through the instrument channel extending into the uterus, the second lumen is for passage of an FPC cable, the front guide sheath 110 is mounted at the distal port portion of the cannula 120, and the imaging assembly 130 is lifted and partially disengaged from the front guide sheath 110 as the working instrument is passed out of the distal port of the cannula 120.

The working instrument of the present invention may be used for surgical or biopsy purposes, including but not limited to various biopsy instruments (e.g., forceps, graspers, scissors, etc.) having a size of 5Fr or less.

When the operation of the working instrument is needed, the working instrument enters the first lumen from the handle mechanism, and the imaging assembly 130 is forced to be lifted to be partially separated from the front guide sleeve 110 along with the gradual reaching of the working instrument to the distal end of the cannula 120, so that the working instrument can smoothly pass out of the first lumen for operation.

In order to better reposition imaging assembly 130 within front guide sleeve 110 after the work implement exits cannula 120, a spring 140 is connected between imaging assembly 130 and cannula 120, and spring 140 is a flexible steel sheet for controlling the repositioning of imaging assembly 130. In order to better install the elastic piece 140, a first supporting sleeve 151 is installed inside the distal end of the insertion tube 120, referring to fig. 16, an elastic piece groove 1511 is formed on the first supporting sleeve 151, one end of the elastic piece 140 is embedded into the elastic piece groove 1511, the other end is installed on the imaging assembly 130, and the other end of the elastic piece 140 can be installed on the imaging assembly 130 by gluing.

Referring to fig. 10 and 14, the imaging assembly 130 includes a lens module 131, a lens holder 132 and at least one LED lamp 133, and the lens module 131 generally includes a camera capable of photographing for photographing an image of the interior of the uterus. Further, the other end of the elastic sheet 140 may be mounted on the lens mount by means of adhesive. The LED lamp 133 is used to illuminate the interior of the uterus, and the LED lamp 133 is disposed on the outer circumference of the lens module 131. The lens mount 132 is used for mounting and fixing the lens module 131 and the LED lamp 133, the lens mount 132 has a smooth outer surface, and the outer contour of the lens mount 132 is adapted to the front guide sleeve 110. In addition, the end of the lens mount 132 far away from the cannula 120 exceeds the corresponding end of the front guide sleeve 110, and the radial dimension of the part of the lens mount 132 exceeding the front guide sleeve 110 is smaller than or equal to the radial dimension of the other part of the lens mount 132 (the part of the lens mount 132 corresponding to the front guide sleeve 110), so that the design is beneficial to reducing the size of the insertion end of the insertion mechanism and facilitating the insertion mechanism to smoothly enter the uterus.

The cannula 120 comprises an inner tube 121 and an outer tube 122, the outer tube 122 is sleeved on the inner tube 121, a gap between the inner tube 121 and the outer tube 122 forms a second lumen, and a hollow interior of the inner tube 121 forms a first lumen. In order to reduce the radial size of the insertion tube 120 as much as possible, and also to smoothly pass the FPC cable and to smooth the injected water flow, the inner tube 121 and the outer tube 122 are eccentrically disposed, with the side of the eccentric arrangement where the gap between the inner tube 121 and the outer tube 122 is larger being the main channel of the second lumen, for the FPC cable to pass through the channel and the main flow channel of the injected water.

In order to better arrange the FPC cables connected to the lens module 131 and the LED lamp 133, referring to fig. 16, a cable wire groove 1512 is further provided on the first supporting sleeve 151, and the cable wire groove 1512 is in communication with the second lumen. In order to make the arrangement of the FPC flat cable more orderly, the flat cable passing groove 1512 is disposed at a position corresponding to the elastic sheet groove 1511, that is, the elastic sheet groove 1511 is located on the outer wall of the first supporting sleeve 151, and the flat cable passing groove 1512 is located on the inner wall of the first supporting sleeve 151 corresponding to the elastic sheet groove 1511.

Referring to fig. 13, an end of the front guide sleeve 110 near the insertion tube 120 is provided with a mounting groove 111, the mounting groove 111 is obliquely arranged and provided with a limiting plate 112, referring to fig. 14, a connecting post 1321 is arranged on the imaging assembly 130 corresponding to the mounting groove 111, and the connecting post 1321 is positioned in the mounting groove 111. The spacing sheet 112 may be provided to prevent the imaging assembly 130 from falling off.

The handle mechanism includes a housing 210, a sleeve 220, and a drive mechanism, the sleeve 220 being located within the housing 210, the proximal end of the outer tube 122 being located within the sleeve 220, the proximal end of the inner tube 121 extending out of the sleeve 220 to connect with the drive mechanism, the drive mechanism being used to control limited rotation of the cannula 120, and the drive mechanism also being used for insertion of a work implement.

Referring to fig. 11, an eccentric tube 300 is installed between the sleeve 220 and the outer tube 122, and the eccentric tube 300 is fixedly sleeved on the outer tube 122. The eccentric tube 300 seals one end of the housing 210 near the imaging assembly 130, a stainless steel sleeve 400 is installed between the eccentric tube 300 and the sleeve 220, and the stainless steel sleeve 400 is fixed to the inner wall of the sleeve 220 to reduce friction generated when the eccentric tube 300 rotates with respect to the sleeve 220. In order to better maintain eccentric arrangement between the outer tube 122 and the inner tube 121, a second supporting sleeve 152 is installed between the proximal end of the outer tube 122 and the inner tube 121, and a flat square 1521 is arranged on the outer wall of the second supporting sleeve 152, so that smooth passing of the FPC flat cable is facilitated due to the arrangement of the flat square 1521.

Referring to fig. 5,6 and 11, in order to make the sleeve 220 more stably installed in the housing 210, a clamping groove 221 is formed on the circumferential outer wall of the sleeve 220, a clamping ring 211 is formed at a position of the housing 210 corresponding to the clamping groove 221, and the clamping ring 211 is embedded in the clamping groove 221. In order to allow the FPC cable to smoothly enter the second lumen, a cable hole 222 is provided in the sleeve 220 for the FPC cable to pass through.

Referring to fig. 9, 11 and 15, the sleeve 220 has a water injection connection pipe 223 and a water pumping connection pipe 224, the water inlet end of the water injection connection pipe 223 is connected with a water injection pipe 500, the water outlet end of the water injection connection pipe 223 is communicated with the second lumen, i.e. the water outlet end of the water injection connection pipe 223 is communicated with the hollow interior of the sleeve 220, the hollow interior of the sleeve 220 is communicated with the interior of the outer tube 122, i.e. the hollow interior of the sleeve 220 is communicated with the second lumen, but the hollow interior of the sleeve 220 cannot be communicated with the inner tube 121. The water inlet end of the water pumping connection pipe 224 is communicated with the first pipe cavity, that is, the position of the inner pipe 121 corresponding to the water inlet end of the water pumping connection pipe 224 is provided with a water outlet hole, the water inlet end of the water pumping connection pipe 224 is connected at the water outlet hole, and the water outlet end of the water pumping connection pipe 224 is communicated with the water pumping pipe 600. To avoid distension Gong Shi, the uterus is transiently distracted, and a hydraulic sensor 700 is mounted on the water injection tube for monitoring the pressure inside the uterus to control the water injection, the hydraulic sensor 700 being located inside the housing 210.

Referring to fig. 5, 6, 11 and 12, the driving mechanism includes a knob 231 and a stop collar 232, and the knob 231 and the stop collar 232 each have a hole through which a working device passes. The proximal end of the inner tube 121 is fixed in the limit sleeve 232, one end of the knob 231 is fixedly inserted into the limit sleeve 232, the knob 231 rotates to drive the limit sleeve 232 to rotate, and the other end of the knob 231 penetrates out of the housing 210 to rotate. The outer wall of the limit sleeve 232 is provided with a plurality of limit grooves 2321 distributed at equal intervals along the circumferential direction, the inner wall of the shell 210 is provided with a steel ball blind hole 212, a movable steel ball 213 is arranged in the steel ball blind hole 212, a spring 214 is connected between the steel ball 213 and the steel ball blind hole 212, and the steel ball 213 is clamped in one of the limit grooves 2321. The knob 231 is rotated, the limit sleeve 232 rotates along with the rotation of the knob 231, the steel ball 213 jumps out of the original limit groove 2321 in the rotating process and is extruded into the steel ball blind hole 212 until the steel ball 213 rotates to a proper position, the steel ball 213 is embedded into the corresponding limit groove 2321, the rotation of the limit sleeve 232 drives the inner tube 121 to rotate, and the cooperation of the steel ball blind hole 212 and the steel ball 213 can form a certain damping gear sense for the rotation of the limit sleeve 232 and the inner tube 121. In order to avoid the confusion of FPC wires caused by the fact that the limiting sleeve 232 infinitely rotates to drive the inner tube 121 to infinitely rotate, the side wall of the limiting sleeve 232 is further provided with a limiting boss 2322, the inner wall of the housing 210 is provided with a limiting stop 215, and the limiting stop 215 is used for limiting the circumferential unlimited rotation of the limiting boss 2322.

Referring to fig. 11, in order to enhance the strength of the inner tube 121, a supporting tube 240 is sleeved at the proximal end of the inner tube 121, one end of the supporting tube 240 is inserted into the sleeve 220, and the other end is inserted into the stop collar 232. A sealing seat 250 is also installed between the support tube 240 and the sleeve 220, and a sealing ring is arranged in the sealing seat 250.

In the invention, the FPC wire is inserted into the casing 210 through the wire arrangement hole on the casing 220, enters the channel (namely, the second pipe cavity) between the outer pipe 122 and the inner pipe 121 through the flat square 1521 on the outer wall of the second supporting sleeve 152 between the outer pipe 122 and the inner pipe 121, extends to the first supporting sleeve 151 in the second pipe cavity and passes out from the wire arrangement groove of the first supporting sleeve 151, and is connected with the lens module 131 and the LED lamp 133 through the lens base 132.

In the present invention, the water injection pipe 500 is connected to an external water injection mechanism, the water suction pipe 600 is connected to an external negative pressure suction mechanism, and when water needs to be injected into the uterus, the flowing water injected through the water injection pipe 500 flows through the gap between the outer pipe 122 and the inner pipe 121 (i.e., the second lumen) and flows out of the gap between the distal ends of the outer pipe 122 and the inner pipe 121, or a plurality of circular holes 1221 are formed in the distal end of the outer pipe 122, the positions of the circular holes 1221 are located outside the positions corresponding to the first supporting sleeve 151, and the injected flowing water can also flow out of the circular holes 1221. When the waste liquid in the uterus is discharged, the waste liquid enters the hollow interior of the inner tube 121 under the action of the external negative pressure suction mechanism, flows into the pumping connection tube 224 through the water outlet hole, then enters the pumping tube 600, and is discharged by the pumping tube 600.

In the endoscope of the present invention, during insertion of the insertion tube 120, the imaging assembly 130 is wrapped in the front guide sleeve 110, and the end of the insertion tube 120 has a small radial dimension and a smooth outer contour, so that the insertion tube can be smoothly inserted into the uterus, thereby avoiding secondary injury. When the cannula 120 needs to be rotated so as to acquire a picture of the uterus at more angles by using the imaging assembly 130, the knob 231 is rotated, the steel ball 213 jumps out of the original limit groove 2321 to enter the steel ball blind hole 212 in the rotation process of the knob 231, the knob 231 is rotated to drive the limit sleeve 232 to rotate, the limit sleeve 232 is rotated to drive the support tube 240 and the inner tube 121 to rotate, and then the eccentric tube 300 and the outer tube 122 are driven to rotate, so that multi-angle photographing of the imaging assembly 130 is realized, the rotation of the knob 231 is stopped after the imaging angle of the imaging assembly 130 is determined, at the moment, the steel ball enters the corresponding limit groove 2321, the rotation of the limit sleeve 232 and the inner tube 121 is limited, and automatic rotation of the limit sleeve 232 and the inner tube 121 is avoided. When the working device is required to be operated, the working device penetrates into the inner tube 121 (namely the first lumen) from the knob 231 and the limit sleeve 232, the working device penetrates out of the inner tube 121 to jack up the imaging assembly 130 until the imaging assembly 130 is partially separated from the front guide sleeve 110, the working device can be smoothly penetrated out for operation, after the working device is used, the working device is withdrawn from the inner tube 121, the imaging assembly 130 is reset to be wrapped in the front guide sleeve 110 under the restoring force of the elastic sheet 140, and the subsequent intubation tube 120 is smoothly withdrawn from the uterus.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention. The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.

Claims (15)

1. The endoscope comprises an insertion mechanism and a handle mechanism, wherein the insertion mechanism is arranged on the handle mechanism, and is characterized in that the insertion mechanism comprises an imaging assembly, a front guide sleeve and an insertion tube, one end of the imaging assembly is movably arranged on the front guide sleeve, the front guide sleeve is used for wrapping part of the imaging assembly and limiting the movement of the imaging assembly, and when the front guide sleeve is wrapped on the imaging assembly, the lateral outer contour of the front guide sleeve is completely flush with the lateral outer contour of the imaging assembly;

The cannula has a first lumen extending from a proximal port portion of the cannula to a distal port portion of the cannula and a second lumen, the first lumen being located within the second lumen, the first lumen being for passage of a working instrument through an instrument channel extending into the uterus, the second lumen being for passage of an FPC flat cable, the front guide sleeve being mounted at the distal port portion of the cannula, the imaging assembly being lifted and partially disengaged from the front guide sleeve when the working instrument is threaded out of the distal port of the cannula.

2. The endoscope of claim 1, wherein a spring is connected between the imaging assembly and the cannula, the spring being configured to control the repositioning of the imaging assembly.

3. The endoscope of claim 2, wherein a first support sleeve is internally mounted at the distal end of the cannula, the first support sleeve having a spring slot therein, one end of the spring being embedded in the spring slot, the other end being mounted on the imaging assembly.

4. The endoscope of claim 3, wherein the first support sleeve further has a wire routing slot thereon, the wire routing slot in communication with the second lumen.

5. The endoscope of claim 1, wherein the other end of the imaging assembly projects beyond a corresponding end of the front guide sleeve.

6. The endoscope of claim 1, wherein the front guide sleeve has a mounting slot at an end thereof adjacent to the insertion tube, the mounting slot being disposed obliquely, and the imaging assembly has a connector post at a location corresponding to the mounting slot, the connector post being disposed within the mounting slot.

7. The endoscope of claim 1, wherein the cannula comprises an inner tube and an outer tube, the outer tube being over-laid on the inner tube and the outer tube being arranged eccentrically, a gap between the inner tube and the outer tube constituting the second lumen, a hollow interior of the inner tube constituting the first lumen.

8. The endoscope of any one of claims 1-7, wherein the handle mechanism comprises a housing, a sleeve within the housing, a proximal end of the outer tube within the sleeve, and a drive mechanism coupled to the drive mechanism for controlling limited rotation of the cannula.

9. The endoscope of claim 8, wherein the sleeve is provided with a water injection connecting pipe and a water pumping connecting pipe, the water inlet end of the water injection connecting pipe is connected with a water injection pipe, the water outlet end of the water injection connecting pipe is communicated with the second pipe cavity, the water inlet end of the water pumping connecting pipe is communicated with the first pipe cavity, and the water outlet end of the water pumping connecting pipe is communicated with the water pumping pipe.

10. The endoscope of claim 9, wherein the water injection tube has a hydraulic sensor mounted thereon.

11. The endoscope of claim 8, wherein the driving mechanism comprises a knob and a limiting sleeve, the proximal end of the inner tube is fixed in the limiting sleeve, the knob rotates to drive the limiting sleeve to rotate, a plurality of limiting grooves distributed at equal intervals along the circumferential direction are formed in the outer wall of the limiting sleeve, steel ball blind holes are formed in the inner wall of the outer shell, movable steel balls are arranged in the steel ball blind holes, and the steel balls are clamped in one of the limiting grooves.

12. The endoscope of claim 11, wherein a spring is connected between the steel ball and the steel ball blind hole.

13. The endoscope of claim 11, wherein the side wall of the stop collar further has a stop projection, and the housing inner wall has a stop block for limiting the circumferential unrestricted rotation of the stop projection.

14. The endoscope of claim 11, wherein the proximal end of the inner tube is sleeved with a support tube, one end of the support tube is inserted into the sleeve, and the other end of the support tube is inserted into the stop collar.

15. The endoscope of claim 8, wherein an eccentric tube is mounted between the sleeve and the outer tube, and the eccentric tube is fixedly sleeved on the outer tube.