Telescopic insertion mechanism and endoscope

Abstract

The invention relates to the technical field of medical instruments, in particular to a telescopic insertion mechanism and an endoscope, the telescopic insertion mechanism is applied to the endoscope, the telescopic insertion mechanism comprises a lens assembly, an outer tube, an inner tube and an elastic piece, the inner tube is used for moving the lens assembly, and the hollow interior of the inner tube is used for forming a channel for a working instrument to penetrate into the uterus; the inner tube penetrates through the outer tube in a sliding manner; the inner tube slides in the outer tube to drive one end of the lens assembly to be hidden or exposed at the far-end opening of the outer tube; the elastic member is used for connecting the lens assembly. The endoscope comprises the telescopic insertion mechanism. The radial size of the insertion part composed of the insertion tube and the lens assembly can be flexibly adjusted, adjustment of the radial size of the insertion part can be achieved only by moving the inner tube, use is convenient and flexible, and the problems that according to an existing endoscope, due to the small-size insertion part, an instrument channel is narrow, operation difficulty is increased, and operation cost is reduced are solved. And the problem of secondary injury caused by the fact that the insertion part with a larger size may scratch the cervix is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a telescopic insertion mechanism and an endoscope. Background Art

[0002] With the rapid development of medical technology, endoscopes are increasingly widely used in the medical field. Gynecological endoscopes were the first to be clinically used and are the main means for the diagnosis and treatment of uterine cavity diseases, and are used for the treatment of diseases such as intrauterine adhesions, submucous myomas of the uterus, abnormalities of intrauterine contraceptive devices, uterine malformations, and endometrial polyps.

[0003] Currently, the common problem of all endoscopes is that the inner diameter of the working channel is small and the applicable range is narrow. Especially when performing uterine examinations and treatments, the lens part is used frequently. However, due to the small opening of the cervix, the relatively large-sized lens insertion part may scratch the cervix and cause secondary damage. On the other hand, the outer diameter of the lens insertion part must be maintained within a certain range. A smaller size will inevitably make the instrument channel inside the instrument tube smaller, and the narrow instrument channel will increase the difficulty of operation and reduce the surgical efficiency. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a telescopic insertion mechanism and an endoscope, so as to at least solve the problems that the relatively small-sized insertion part of the existing endoscope makes the instrument channel narrow and increases the operation difficulty, and the relatively large-sized insertion part may scratch the cervix and cause secondary damage.

[0005] The present invention solves the above technical problems through the following technical means:

[0006] The first aspect of the present invention provides a telescopic insertion mechanism applied to an endoscope, including:

[0007] A lens assembly for obtaining images inside the uterus;

[0008] An outer tube having a proximal opening and a distal opening;

[0009] An inner tube for moving the lens assembly, and the hollow interior of the inner tube is used to form a channel for working instruments to pass through and enter the uterus. The inner tube slides through the outer tube, and the inner tube also has a proximal opening and a distal opening;

[0010] An elastic member for connecting the lens assembly. One end of the elastic member is installed on the inner tube, and the other end is connected to the lens assembly;

[0011] The inner tube slides in the outer tube to drive the lens assembly to retract and is limited by the distal opening of the outer tube, so that the distal openings of the outer tube and the inner tube are both blocked by the lens assembly;

[0012] Alternatively, the inner tube slides within the outer tube to drive the lens assembly to move away from the distal opening of the outer tube. At this time, the lens assembly can be lifted by the working instrument that can be inserted.

[0013] With the above technical solution, during the process of inserting the cannula into the uterus, one end of the lens assembly is partially hidden in the distal opening of the outer tube. At this time, the upper edge of the lens assembly close to the cannula abuts against the distal opening of the outer tube, and the lens assembly is limited by the tube wall of the distal opening of the outer tube, and the elastic piece deforms into a bent state. At this time, the overall radial dimension of the insertion part composed of the cannula and the lens assembly is small, and it can smoothly pass through narrow channels such as the cervix; after the lens assembly enters the uterus, when the working instrument needs to operate on the inside of the uterus, the inner tube is slid relative to the outer tube in the distal direction. At this time, since both the elastic piece fixing sleeve and the front support are clamped on the inner tube, the elastic piece fixing sleeve, the elastic piece and the front support all move in the distal direction following the inner tube. At the same time, the lens assembly also moves away from the distal direction. During the movement, the elastic piece gradually recovers its deformation, and the lens assembly will gradually be exposed to the distal opening of the outer tube. At this time, it is equivalent to the lens assembly being lifted, and the elastic piece recovers its deformation and becomes a flat state. Or after the lens assembly moves away from the distal direction, under the action of the inserted working instrument, the lens assembly is pushed out and lifted, so that the lens assembly is exposed to the distal opening of the outer tube; after the operation is completed, the inner tube is slid relative to the outer tube in the direction away from the lens assembly. During the sliding process, the lens assembly is driven to slide in the same direction, thereby causing the elastic piece to deform and bend again, and the lens assembly is lowered, so that one end of the lens assembly is hidden in the distal port of the outer tube, and the tube wall at the distal opening of the outer tube limits the lens assembly, making the overall radial dimension of the insertion part composed of the cannula and the lens assembly smaller. The radial dimension of the insertion part of the present invention can be flexibly adjusted, and the adjustment of the radial dimension of the insertion part can be achieved only by moving the inner tube, which is convenient and flexible to use, and solves the problems existing in the existing endoscope that the instrument channel of the insertion part with a smaller size is narrow, increasing the operation difficulty, and the insertion part with a larger size may scratch the cervix and cause secondary damage.

[0014] Combined with the first aspect, in some embodiments, the outer tube and the inner tube are eccentrically arranged, and the gap between the outer tube and the inner tube forms a lumen for the water injection flow channel and the FPC cable to pass through.

[0015] Combined with the first aspect, in some embodiments, the distal opening of the inner tube has a notch, the position of the elastic member is opposite to the position of the notch, and the width dimension of the elastic member is smaller than the width dimension of the notch.

[0016] Combined with the first aspect, in some embodiments, the elastic member is an elastic piece in the shape of a long strip with the ability to deform.

[0017] In combination with the first aspect, in some embodiments, a shrapnel fixing sleeve is arranged between the inner tube and the outer tube. The shrapnel fixing sleeve is clamped on the inner tube. The shrapnel fixing sleeve has a shrapnel installation groove, and one end of the elastic member extends into the shrapnel installation groove.

[0018] In combination with the first aspect, in some embodiments, a first flat side is provided on the outer wall of the top of the shrapnel fixing sleeve, and a second flat side is arranged on the outer side wall of the shrapnel fixing sleeve.

[0019] In combination with the first aspect, in some embodiments, a front support member is further installed at the distal ends of the inner tube and the outer tube. A through groove is provided on the inner wall of the front support member, and the through groove is a channel for the elastic member and the FPC cable to pass through.

[0020] In combination with the first aspect, in some embodiments, the outer wall of the front support member has a third flat side. A water-blocking arc block is formed at the end of the front support member close to the lens assembly. The position of the water-blocking arc block is opposite to the position of the third flat side, and the outer side wall of the water-blocking arc block is slidably fitted with the inner wall of the outer tube.

[0021] In combination with the first aspect, in some embodiments, the outer tube has a water outlet hole, and the water outlet hole is on the same side as the third flat side.

[0022] In combination with the first aspect, in some embodiments, the lens assembly includes a lens holder, a lens module, an LED lamp, and an FPC. The other end of the elastic member is fixedly connected to the lens holder. The lens module is installed on the lens holder. The FPC is connected to the lens module, and the LED lamp is arranged on the outer circumference of the lens module.

[0023] The second aspect of the present invention lies in providing an endoscope, and the endoscope includes the above telescopic insertion mechanism.

[0024] In combination with the second aspect, in some embodiments, the endoscope further includes a handle assembly. The handle assembly is used to drive the inner tube to slide relative to the outer tube and limit the sliding of the inner tube. The proximal ends of the inner tube and the outer tube are both located inside the handle assembly.

[0025] In combination with the second aspect, in some embodiments, the handle assembly includes a housing, a rear guide sleeve, and a support sleeve. The support sleeve is rotatably installed inside the housing. The support sleeve is fixedly sleeved on the proximal end of the outer tube. The rear guide sleeve slidably passes through the housing and is connected with a knob on the outside of the housing. The knob is used to control the rotation angle of the outer tube and the inner tube. A snap ring is provided on the outer wall of the rear guide sleeve. A card slot is opened on one side of the housing where the rear guide sleeve passes through. When the rear guide sleeve moves relative to the housing, the snap ring can be embedded into the card slot. A toggle button is provided on the housing, and the toggle button can control the up and down movement of the card slot;

[0026] A support tube is connected between the support sleeve and the rear guide sleeve. The support tube is sleeved on the proximal end of the inner tube. A first spring is sleeved on the support tube, and the first spring is located between the support sleeve and the rear guide sleeve.

[0027] In combination with the second aspect, in some embodiments, an axial through hole is formed inside the rear guide sleeve, and the through hole communicates with the inner tube to form an instrument channel.

[0028] In combination with the second aspect, in some embodiments, a drainage connection pipe is connected to the rear guide sleeve. The drainage connection pipe is connected to a drainage pipe, and the drainage connection pipe communicates with the instrument channel; a water injection connection pipe is connected to the support sleeve. The water injection connection pipe communicates with the lumen, and the water injection connection pipe is connected to a water injection pipe.

[0029] In combination with the second aspect, in some embodiments, the support sleeve includes a front sleeve and a rear sleeve fixedly connected. A plurality of steel ball grooves are circumferentially and equidistantly arranged on the outer wall of the front sleeve. A steel ball column is fixed to the inner wall of the housing corresponding to the position of the front sleeve, and a movable steel ball is placed inside the steel ball column.

[0030] In combination with the second aspect, in some embodiments, a second spring is installed between the steel ball column and the steel ball.

[0031] In combination with the second aspect, in some embodiments, a limit post is fixed on the outer wall of the front sleeve, and a clamping block is further installed on the inner wall of the housing. The clamping block is used to limit the infinite rotation of the limit post.

[0032] In combination with the second aspect, in some embodiments, a driven sleeve is sleeved on the support tube. The driven sleeve is located inside the support sleeve. A first sealing ring and a retaining ring are arranged inside the driven sleeve, and both the first sealing ring and the retaining ring are sleeved on the support tube.

[0033] In combination with the second aspect, in some embodiments, a second sealing ring and a retaining ring are installed near the knob inside the rear guide sleeve. The retaining ring is located outside the second sealing ring, and both the second sealing ring and the retaining ring are provided with through holes.

[0034] The radial dimension of the insertion part in the endoscope of the present invention can be flexibly adjusted, and the adjustment of the radial dimension of the insertion part can be achieved only by moving the inner tube. It is convenient and flexible to use, and solves the problems existing in the existing endoscope that the instrument channel is narrow due to the small-size insertion part, increasing the operation difficulty, and the large-size insertion part may scratch the cervix and cause secondary injury.

[0035] By toggling the knob, the snap ring is inserted into the card slot, enabling the inner tube to slide proximally relative to the outer tube, driving the lens assembly to move and hiding one end of the lens assembly at the distal port of the outer tube for limiting, thus reducing the radial dimension of the insertion portion; by pressing the rear guide sleeve, the snap ring is disengaged from the card slot and abuts against the inner wall of the housing, allowing the lens assembly to be lifted to facilitate the entry of the working instrument, with simple and convenient operation.

[0036] For the endoscope of the present invention, by rotating the knob, the rear guide sleeve can be driven to rotate, and then the support tube and the support sleeve can be driven to rotate, enabling the inner tube and the outer tube to rotate simultaneously, for adjusting the rotation angle of the insertion mechanism, so as to facilitate the lens assembly to obtain images of the uterine interior from multiple angles and facilitate the multi-angle operation of the working instrument, with flexible and convenient use. And during the rotation of the support sleeve, the cooperation of the steel ball groove and the steel ball can achieve multi-gear selection of the rotation angle, and the cooperation of the clamping block and the limiting post can prevent the excessive rotation of the support sleeve, causing chaos in the internal wiring and connecting pipes. Description of the Drawings

[0037] Figure 1 It is a schematic structural view of the lens assembly in a retracted state in the telescopic insertion mechanism of Embodiment 1;

[0038] Figure 2 It is a schematic structural view of the lens assembly in a lifted state in the telescopic insertion mechanism of Embodiment 1;

[0039] Figure 3 It is a schematic structural view of the connection between the lens assembly and the elastic member;

[0040] Figure 4 It is an enlarged schematic structural view of the elastic piece fixing sleeve;

[0041] Figure 5 It is an enlarged schematic structural view of the front support member;

[0042] Figure 6 It is Figure 1 An enlarged view of the G-G cross-sectional view in

[0043] Figure 7 It is a schematic structural view of the lens assembly in a retracted state in the endoscope of Embodiment 2;

[0044] Figure 8 It is Figure 7 An enlarged schematic structural view of the position A in

[0045] Figure 9 It is a schematic structural view of the lens assembly in a lifted state in the endoscope of Embodiment 2;

[0046] Figure 10 It is Figure 9 An enlarged schematic structural view of the position B in

[0047] Figure 11 is Figure 7 an enlarged view of the J-J direction view in

[0048] Figure 12 a schematic structural view of a support sleeve;

[0049] Figure 13 a schematic structural view of a rear guide sleeve;

[0050] Figure 14 a schematic structural view of a housing;

[0051] Figure 15 an enlarged schematic structural view of a support tube and a driven sleeve;

[0052] Among them, lumen 0, lens holder 111, step structure 1111, lens module 112, LED lamp 113, outer tube 120, water outlet hole 121, inner tube 130, notch 131, elastic member 140, FPC cable 150, shrapnel fixing sleeve 160, shrapnel installation groove 161, first flat side 162, second flat side 163, front support member 170, through groove 171, third flat side 172, water blocking arc block 173, rear support member 180;

[0053] housing 210, card slot 211, dial button 212, steel ball column 213, steel ball 214, card block 215, rear guide sleeve 220, snap ring 221, drain connection pipe 222, support sleeve 230, water injection connection pipe 231, steel ball groove 232, limit post 233, cable hole 234, knob 240, support tube 250, fifth flat side 251, first spring 260, second spring 270, driven sleeve 280, first sealing ring 281, retaining ring 282, fourth flat side 283, second sealing ring 291, retaining ring 292;

[0054] drain pipe 310, water injection pipe 320. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0056] For those not specified in the following embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For raw materials, equipment or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0057] Embodiment 1

[0058] Please refer to Figures 1-6 , this embodiment describes a telescopic insertion mechanism, which can be applied to an endoscope for examining a patient's uterus. The telescopic insertion mechanism includes a lens assembly, an outer tube 120, an inner tube 130 and an elastic member 140. The lens assembly is used to obtain an image of the inside of the uterus. The lens assembly includes a lens seat 111, a lens module 112, at least one LED lamp 113 and an FPC. The lens module 112 generally includes a camera capable of taking pictures, which is used to take images of the inside of the uterus. The outer wall of the lens seat 111 has a step structure 1111. The lens seat 111 is used to install and fix the lens module 112. The other end of the elastic member 140 is fixed on the lens seat 111. In this embodiment, the connection method of the elastic member 140 and the lens seat 111 is not specifically limited, as long as the two can be fixedly connected, for example, it can be welded or fixed with screws. The FPC is connected to the lens module 112, and the FPC cable led out of the FPC passes through the lens seat 111 and is arranged above the elastic member 140. The LED lights 113 are arranged on the outer circumference of the lens module 112 to illuminate the inside of the uterus.

[0059] The inner tube 130 is used to move the lens assembly, and the hollow interior of the inner tube 130 is used to form a passage for the working instrument to pass through and enter the uterus. Both the inner tube 130 and the outer tube 120 have a proximal opening and a distal opening, where the distal end refers to the end extending into the uterus, and the proximal end refers to the end away from the distal end. The outer tube 120 and the inner tube 130 are both long, tubular components, and the sizes of the two are sufficient to pass through the cervix and enter the uterus. The inner tube 130 is slidably inserted into the outer tube 120 to form a cannula that passes through the cervix and enters the uterus. The inner tube 130 slides in the outer tube 120 to drive one end of the lens assembly to be hidden or exposed in the distal opening of the outer tube 120. Specifically, the inner tube 130 slides in the outer tube 120, driving the lens assembly to retract and be limited by the distal opening of the outer tube 120, so that the distal openings of the outer tube 120 and the inner tube 130 are both blocked by the lens assembly; or, the inner tube 130 slides in the outer tube 120, driving the lens assembly to move away from the distal opening of the outer tube 120, at which time the lens assembly can be lifted by the inserted working tool.

[0060] Please refer to Figure 6 In order to reduce the radial dimension of the cannula as much as possible, the inner tube 130 and the outer tube 120 are arranged eccentrically, and the gap between the outer tube 120 and the inner tube 130 constitutes a lumen 0, which is used for the water injection flow channel and the FPC cable 150 passing through the channel. The side with a larger gap between the eccentrically arranged inner tube 130 and the outer tube 120 serves as the main cavity of the lumen 0.

[0061] The working instrument can be used for surgical or biopsy purposes, and the working instrument includes, but is not limited to, various biopsy instruments having a size of 5 Fr or smaller (e.g., forceps, graspers, scissors, etc.).

[0062] The elastic member 140 is used to connect the lens assembly. One end of the elastic member 140 is mounted on the inner tube 130, and the other end is fixedly connected to the lens assembly. The elastic member 140 is a strip-shaped elastic sheet with the ability to deform, generally made of a metal material. In this embodiment, it is preferably made of nickel-titanium alloy and has a thickness of about 0.3 mm.

[0063] The distal opening of the inner tube 130 has a notch 131. The position of the elastic member 140 is opposite to the position of the notch 131, and the width dimension of the elastic member 140 is smaller than the width dimension of the notch 131 to facilitate the swinging of the elastic member 140 within the notch 131.

[0064] A retaining sleeve 160 for the elastic sheet is provided between the inner tube 130 and the outer tube 120. The retaining sleeve 160 is clamped on the inner tube 130. Please refer to Figure 4 , the retaining sleeve 160 for the elastic sheet has an elastic sheet mounting groove 161. One end of the elastic member 140 extends into the elastic sheet mounting groove 161, and the width dimension of the elastic sheet mounting groove 161 matches that of the elastic sheet. The provision of the retaining sleeve 160 for the elastic sheet can achieve the mounting of the elastic sheet on the inner tube 130 with simple assembly. For better arrangement of the FPC cable 150, a first flat side 162 is provided on the top outer wall of the retaining sleeve 160 for the elastic sheet, and the FPC cable 150 passes through the first flat side 162. For the smooth flow of the injected water, a second flat side 163 is provided on the outer side wall of the retaining sleeve 160 for the elastic sheet.

[0065] A front support member 170 is further mounted at the distal ends of the inner tube 130 and the outer tube 120. The front support member 170 is clamped on the inner tube 130 to support the outer tube 120, enabling the outer tube 120 and the inner tube 130 to maintain an eccentric setting more stably. Please refer to Figure 5, there is a through groove 171 on the inner wall of the front support member 170, and the through groove 171 is a channel for the elastic member 140 and the FPC cable 150 to pass through. The outer side wall of the front support member 170 has a third flat 172, and the third flat 172 further enables the injected flowing water to flow smoothly. In order to prevent the injected flowing water from flowing towards the lens assembly and interfering with the normal operation of the lens assembly, a water blocking arc block 173 is formed at the end of the front support member 170 close to the lens assembly. The position of the water blocking arc block 173 is opposite to the position of the third flat 172. The outer side wall of the water blocking arc block 173 is slidably fitted with the inner wall of the outer tube 120 to prevent the injected flowing water from flowing towards the lens assembly. In order to enable the injected flowing water to smoothly enter the uterus, the outer tube 120 has a water outlet hole 121, and the water outlet hole 121 is on the same side as the third flat 172 and the positions correspond to each other. No matter how the inner tube 130 slides relative to the outer tube 120, at least one water outlet hole 121 coincides with the third flat 172. The injected flowing water enters from the lumen 0, flows through the second flat 163 on the outer side wall of the elastic piece fixing sleeve 160 and the third flat 172 on the front support member 170, and then flows out from the water outlet hole 121 into the uterus.

[0066] When the inner tube 130 slides in the outer tube 120 towards the proximal direction, it drives the lens assembly to retract and is limited by the distal opening of the outer tube, so that the distal openings of both the outer tube 120 and the inner tube 130 are blocked by the lens assembly; when the inner tube 130 slides in the outer tube 120 towards the distal direction, it drives the lens assembly to move away from the distal opening of the outer tube 120, and is lifted under the action of the elastic member 140, so that the distal opening of the inner tube 130 is completely penetrated, facilitating the extension operation of the working instrument.

[0067] Specifically, during the process of the intubation tube extending into the uterus, one end of the lens assembly is partially hidden in the distal opening of the outer tube 120. At this time, the tube wall of the distal opening of the outer tube 120 abuts against the step structure 1111, so that the lens assembly is limited by the distal opening of the outer tube 120 and is in a retracted state, and the elastic piece deforms into a bent state. At this time, the overall radial dimension of the insertion part composed of the intubation tube and the lens assembly is small, and it can smoothly pass through narrow channels such as the cervix. Please refer to Figure 1 ; after the lens assembly enters the uterus, when the working instrument needs to operate on the uterus, the inner tube 130 is slid relative to the outer tube 120 towards the distal direction. At this time, since both the elastic piece fixing sleeve 160 and the front support member 170 are clamped on the inner tube 130, the elastic piece fixing sleeve 160, the elastic piece and the front support member 170 all move towards the distal direction following the inner tube 130. At the same time, the lens assembly also moves away from the distal direction. During the movement, the elastic piece gradually recovers its deformation, and the lens assembly will gradually be exposed to the distal opening of the outer tube 120. At this time, it is equivalent to the lens assembly being lifted, and the elastic piece recovers its deformation and becomes a flat state. Please refer to Figure 2After the operation is completed, the inner tube 130 is slid relative to the outer tube 120 in a direction away from the lens assembly. During the sliding process, the lens assembly is driven to slide in the same direction, thereby deforming and bending the elastic piece again, and the lens assembly is lifted, so that one end of the lens assembly is hidden in the distal port of the outer tube 120, and the movement of the lens assembly is limited by abutting against the stepped structure 1111 through the tube wall of the distal opening of the outer tube 120, so that the overall radial dimension of the insertion part composed of the cannula and the lens assembly becomes smaller.

[0068] Embodiment 2

[0069] Please refer to Figures 1-15 , this embodiment describes an endoscope, which includes the telescopic insertion mechanism and the handle assembly of Embodiment 1. The handle assembly is used to drive the inner tube 130 to slide relative to the outer tube 120, limit the sliding of the inner tube 130, and drive the inner tube 130 and the outer tube 120 to rotate simultaneously. The proximal ends of the inner tube 130 and the outer tube 120 are both located inside the handle assembly.

[0070] The handle assembly includes a housing 210, a rear guide sleeve 220 and a support sleeve 230. The support sleeve 230 is rotatably installed inside the housing 210. The support sleeve 230 is fixedly sleeved on the proximal end of the outer tube 120. The rear guide sleeve 220 slides through the housing 210 and is connected with a knob 240 on the outside of the housing 210. The knob 240 is used to control the rotation angle of the outer tube 120 and the inner tube 130. A snap ring 221 is provided on the outer wall of the rear guide sleeve 220. A clamping groove 211 is provided on the housing 210 on the side where the rear guide sleeve 220 passes through. When the rear guide sleeve 220 moves relative to the housing 210, the snap ring 221 can be embedded in the clamping groove 211. A toggle button 212 is provided on the housing 210, and the toggle button 212 can control the up and down movement of the clamping groove 211; A support tube 250 is connected between the support sleeve 230 and the rear guide sleeve 220. The support tube 250 is sleeved on the proximal end of the inner tube 130. A first spring 260 is sleeved on the support tube 250. The first spring 260 is located between the support sleeve 230 and the rear guide sleeve 220.

[0071] When the working instrument is operating inside the uterus, the lens assembly is in the lifted state. At this time, the snap ring 221 is disengaged from the clamping groove and is located inside the housing 210. At this time, the snap ring 221 abuts against the inner wall of the housing 210, and the first spring 260 is in a compressed state. Please refer to Figure 9 and Figure 10; When the working instrument is taken out after the operation is completed, the lens assembly needs to be taken out. At this time, the button 212 is toggled upward, the card slot 211 moves upward, and the inner wall of the housing 210 loses the ability to restrict the snap ring 221. Under the action of the deformation recovery force of the first spring 260, the rear guide sleeve 220 moves toward the outer wall direction of the housing 210 until the snap ring 221 is embedded in the card slot 211. The card slot 211 restricts the position of the snap ring 221 to prevent it from continuing to move outward of the housing 210. During the movement of the rear guide sleeve 220, the support tube 250 and the inner tube 130 are driven to move in the same direction, thereby driving the lens assembly to move. One end portion of the lens assembly is partially hidden in the distal opening of the outer tube 120, and the upper edge of the lens assembly near the cannula abuts against the distal opening of the outer tube 120. Please refer to Figure 7 and Figure 8 . When the working instrument needs to enter the uterus for work, only the rear guide sleeve 220 needs to be pressed toward the inside of the housing 210, so that the rear guide sleeve 220, the support tube 250 and the inner tube 130 move toward the lens assembly at the same time, causing the lens assembly to lift up.

[0072] Please refer to Figure 13 . An axial through hole is formed inside the rear guide sleeve 220, and the through hole communicates with the inner tube 130 to form an instrument channel. A drainage connection pipe 222 is connected to the rear guide sleeve 220, and the drainage connection pipe 222 is connected to a drainage pipe 310. The drainage connection pipe 222 communicates with the instrument channel; a water injection connection pipe 231 is connected to the support sleeve 230, the water injection connection pipe 231 communicates with the lumen 0, and the water injection connection pipe 231 is connected to a water injection pipe 320.

[0073] Please refer to Figure 12 . The support sleeve 230 includes a front sleeve and a rear sleeve fixedly connected. A plurality of steel ball grooves 232 are circumferentially and equidistantly arranged on the outer wall of the front sleeve. A steel ball post 213 is fixed to the inner wall of the housing 210 corresponding to the position of the front sleeve. A movable steel ball 214 is placed inside the steel ball post 213, and a second spring 270 is installed between the steel ball post 213 and the steel ball 214. When the support sleeve 230 rotates, when a steel ball groove 232 is opposite to the steel ball 214, a part of the steel ball 214 will be located in the steel ball groove 232. When the steel ball groove 232 is misaligned with the steel ball 214, at this time the steel ball 214 will be entirely located inside the steel ball post 213. The cooperation between the steel ball groove 232 and the steel ball 214 forms a certain damping gear feeling for the rotation of the support sleeve 230.

[0074] Since there are connecting pipes and FPC cable 150 inside the outer shell 210, if the support sleeve 230 rotates without limitation, it will affect the connection of the water pipe and the FPC cable 150. To prevent the support sleeve 230 from rotating 360° without limitation, a limit post 233 is fixed on the outer wall of the front sleeve, and a clamping block 215 is also installed on the inner wall of the outer shell 210. The clamping block 215 is used to limit the unlimited rotation of the limit post 233.

[0075] To enhance the sealing performance of the entire endoscope, a driven sleeve 280 is sleeved on the support tube 250. The driven sleeve 280 is located inside the support sleeve 230. A first sealing ring 281 and a retaining ring 282 are arranged inside the driven sleeve 280, and both the first sealing ring 281 and the retaining ring 282 are sleeved on the support tube 250. The inner wall of the driven sleeve 280 has a fourth flat side 283, and the support tube 250 has a fifth flat side 251. The support tube 250 is inserted into the driven sleeve 280, and the fourth flat side 283 abuts against the fifth flat side 251. Please refer to Figure 15 Inside the rear guide sleeve 220, near the knob 240, a second sealing ring 291 and a retaining ring 292 are installed. The retaining ring 292 is located outside the second sealing ring 291, and both the second sealing ring 291 and the retaining ring 292 have through holes.

[0076] To better arrange the FPC cable 150, the support sleeve 230 has a cable hole 234, and the FPC cable 150 passes through the cable hole 234 and enters the space between the outer tube 120 and the inner tube 130.

[0077] A rear support member 180 is also installed between the proximal end of the outer tube 120 and the inner tube 130. The rear support member 180 is fixedly sleeved on the inner tube 130. The rear support member 180 has a channel for water injection and circulation. Preferably, the structure of the rear support member is the same as that of the front support member 170.

[0078] After the FPC cable 150 enters the inside of the outer shell 210, it passes through the cable hole on the support sleeve 230 and enters the support sleeve 230, then passes through the rear support member and enters the lumen 0 between the outer tube 120 and the inner tube 130, passes through the first flat side on the elastic sheet fixing sleeve 160, and passes through the through slot inside the support member and is connected to the lens module 112 through the lens holder 111.

[0079] The water injection pipe is connected to an external water injection mechanism, and the drain pipe is connected to an external negative pressure suction mechanism. When injecting water into the uterus, the flowing water injected through the water injection pipe enters the interior of the support sleeve 230, and enters the lumen 0 between the outer tube 120 and the inner tube 130 through the rear support member, flows through the elastic piece fixing groove to the front support member 170, and realizes water injection into the uterus through the gap between the third flat side and the outer tube 120 and the water outlet holes. When discharging the waste liquid in the uterus, the waste liquid enters the interior of the inner tube 130 through the distal end of the inner tube 130, flows to the interior of the support tube 250, and then is discharged through the drain connection pipe into the drain pipe.

[0080] By rotating the knob, the rear guide sleeve 220 can be driven to rotate, and further drive the support tube 250 and the support sleeve 230 to rotate, so that the inner tube 130 and the outer tube 120 rotate simultaneously, which is used to adjust the rotation angle of the insertion mechanism, so as to facilitate the lens assembly to obtain images of the interior of the uterus from multiple angles, and facilitate the multi-angle operation of the working instrument. The cooperation between the steel ball groove 232 and the steel ball can realize multi-gear selection of the rotation angle. The cooperation between the block 215 and the limit post 233 can prevent the over-rotation of the support sleeve 230, resulting in chaos of the internal wiring and connection pipes.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A telescopic insertion mechanism, characterized in that, Applied to an endoscope, including: A lens assembly for acquiring images inside the uterus; An outer tube having a proximal opening and a distal opening; An inner tube for moving the lens assembly, and the hollow interior of the inner tube forms a passage for a working instrument to pass through and enter the uterus. The inner tube is slidably disposed within the outer tube, and the inner tube also has a proximal opening and a distal opening; An elastic member for connecting the lens assembly. One end of the elastic member is mounted on the inner tube, and the other end is connected to the lens assembly; The inner tube slides within the outer tube to drive the lens assembly to retract and is limited by the distal opening of the outer tube, so that both the distal openings of the outer tube and the inner tube are blocked by the lens assembly; Alternatively, the inner tube slides within the outer tube to drive the lens assembly to move away from the distal opening of the outer tube. At this time, the lens assembly can be lifted by the inserted working instrument.

2. The telescopic insertion mechanism according to claim 1, wherein, The outer tube and the inner tube are eccentrically arranged, and the gap between the outer tube and the inner tube forms a lumen for a water injection flow passage and an FPC cable to pass through; 3. The telescopic insertion mechanism according to claim 1, wherein, The distal opening of the inner tube has a notch, the position of the elastic member is opposite to the position of the notch, and the width dimension of the elastic member is smaller than the width dimension of the notch; 4. A telescopic insertion mechanism according to claim 3, wherein, The elastic member is a strip-shaped elastic sheet with deformation ability; 5. The telescopic insertion mechanism according to claim 1, wherein, An elastic sheet fixing sleeve is provided between the inner tube and the outer tube. The elastic sheet fixing sleeve is clamped on the inner tube and has an elastic sheet mounting groove. One end of the elastic member extends into the elastic sheet mounting groove; 6. The telescopic insertion mechanism according to claim 5, wherein, The top outer wall of the elastic sheet fixing sleeve has a first flat side, and the outer side wall of the elastic sheet fixing sleeve is provided with a second flat side; 7. The telescopic insertion mechanism according to claim 6, wherein, The distal ends of the inner tube and the outer tube are also provided with a front support member. The inner wall of the front support member has a through groove for the elastic member and the FPC cable to pass through; 8. A telescopic insertion mechanism according to claim 7, wherein, The outer side wall of the front support member has a third flat side. A water blocking arc block is formed at the end of the front support member close to the lens assembly. The position of the water blocking arc block is opposite to the position of the third flat side, and the outer side wall of the water blocking arc block is slidably fitted with the inner wall of the outer tube; 9. A telescopic insertion mechanism according to claim 8, wherein, The outer tube has a water outlet hole on the same side as the third flat side; 10. A telescopic insertion mechanism according to claim 1, wherein, The lens assembly includes a lens holder, a lens module, an LED lamp, and an FPC. The other end of the elastic member is fixedly connected to the lens holder. The lens module is mounted on the lens holder. The FPC is connected to the lens module, and the LED lamp is arranged on the outer circumference of the lens module; 11. An endoscope, characterized in that, The endoscope includes a telescopic insertion mechanism according to any one of claims 1-10; 12. The endoscope according to claim 11, characterized in that, The endoscope further includes a handle assembly for driving the inner tube to slide relative to the outer tube and limiting the sliding of the inner tube. The proximal ends of the inner tube and the outer tube are both located inside the handle assembly.

13. The endoscope according to claim 12, characterized in that, The handle assembly includes a housing, a rear guide sleeve, and a support sleeve. The support sleeve is rotatably installed inside the housing. The support sleeve is fixedly sleeved on the proximal end of the outer tube. The rear guide sleeve is slidably inserted into the housing and is connected with a knob on the outside of the housing. The knob is used to control the rotation angle of the outer tube and the inner tube. A snap ring is provided on the outer wall of the rear guide sleeve. A slot is provided on the housing at the side where the rear guide sleeve passes through. When the rear guide sleeve moves relative to the housing, the snap ring can be inserted into the slot. A toggle button is provided on the housing, and the toggle button can control the up and down movement of the slot. A support tube is connected between the support sleeve and the rear guide sleeve. The support tube is sleeved on the proximal end of the inner tube. A first spring is sleeved on the support tube. The first spring is located between the support sleeve and the rear guide sleeve.

14. The endoscope according to claim 13, characterized in that, An axial through hole is provided inside the rear guide sleeve. The through hole communicates with the inner tube to form an instrument channel.

15. The endoscope according to claim 14, characterized in that, A drainage connection pipe is connected to the rear guide sleeve. The drainage connection pipe is connected with a drainage pipe. The drainage connection pipe communicates with the instrument channel. A water injection connection pipe is connected to the support sleeve. The water injection connection pipe communicates with the lumen. The water injection connection pipe is connected with a water injection pipe.

16. The endoscope according to claim 13, characterized in that, The support sleeve includes a front sleeve and a rear sleeve fixedly connected. A plurality of steel ball grooves are circumferentially and equidistantly arranged on the outer wall of the front sleeve. A steel ball column is fixed on the inner wall of the housing corresponding to the position of the front sleeve. An active steel ball is placed inside the steel ball column.

17. The endoscope according to claim 16, characterized in that, A second spring is installed between the steel ball column and the steel ball.

18. The endoscope according to claim 17, characterized in that, A limit post is fixed on the outer wall of the front sleeve. A clamping block is also installed on the inner wall of the housing. The clamping block is used to limit the unlimited rotation of the limit post.

19. The endoscope according to claim 13, wherein, A driven sleeve is sleeved on the support tube. The driven sleeve is located inside the support sleeve. A first sealing ring and a retaining ring are provided inside the driven sleeve. Both the first sealing ring and the retaining ring are sleeved on the support tube.

20. The endoscope according to claim 13, wherein, A second sealing ring and a retaining ring are installed inside the rear guide sleeve near the knob. The retaining ring is located outside the second sealing ring. Both the second sealing ring and the retaining ring are provided with through holes.

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