An insertion portion, an endoscope, and a medical device

Abstract

The present invention relates to the technical field of medical devices, and discloses an insertion part, an endoscope and a medical device. The insertion part includes an insertion tube and a protective cover; the insertion tube is provided with an instrument channel for water flow and optical fiber to pass through along its own axial direction; the protective cover is arranged at the distal end of the insertion tube for covering the stone, and its circumferential wall is provided with an opening; the water flow flowing out of the instrument channel can flow to the outside of the protective cover through the opening. The endoscope includes an endoscope handle and an insertion part. The medical device includes a sheath tube, and an insertion part or an endoscope. Through the above solutions, the present invention can solve the technical problem of stone splashing existing in lithotripsy in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an insertion portion, an endoscope, and a medical device. Background Art

[0002] An endoscope is a commonly used medical device, which is an inspection device that can directly enter the natural ducts of the human body and can provide sufficient diagnostic information for doctors to treat diseases. During the operation of using the endoscope for lithotripsy, the crushed stones are likely to splash, resulting in the possibility that the crushed stones may not be completely discharged from the patient's body.

[0003] Therefore, providing an insertion portion, an endoscope, and a medical device that can prevent the splashing of stones is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The present invention discloses an insertion portion, an endoscope, and a medical device to solve the technical problem of stone splashing existing in the related lithotripsy.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, an insertion portion is disclosed, which includes an insertion tube and a protective cover;

[0007] The insertion tube is provided with an instrument channel for water flow and optical fiber to pass through along its own axial direction;

[0008] The protective cover is arranged at the distal end of the insertion tube and around the instrument channel, and is used to cover at least part of the area of the stone. An opening is provided on its circumferential wall; the water flow flowing out of the instrument channel can flow to the outside of the protective cover through the opening.

[0009] In some solutions, the opening includes a through hole provided in the middle of the circumferential wall of the protective cover and / or a plurality of notches provided at the distal end of the protective cover;

[0010] The water flow flowing out of the instrument channel can flow to the outside of the protective cover through the through hole and the plurality of notches; and / or, after the distal end of the protective cover is subjected to an external force along the axial direction of the instrument channel, the gap between the plurality of notches increases, so that the distal end of the protective cover moves radially outward.

[0011] In some solutions, the distal end diameter of the protective cover is larger than the proximal end diameter of the protective cover;

[0012] Alternatively, the distal end diameter of the protective cover is equal to the proximal end diameter of the protective cover.

[0013] In some solutions, the protective cover has a fixed end and a free end, and the fixed end is connected to the distal end of the insertion tube;

[0014] The protective cover is configured to have a first state and a second state; when the protective cover is in the first state, the free end extends axially beyond the distal end of the insertion tube; when the protective cover is in the second state, the free end abuts against the outer peripheral wall of the insertion tube;

[0015] Wherein, the protective cover can be switched from the second state to the first state.

[0016] In some solutions, the free end has a clamping portion, and a clamping groove is provided on the outer peripheral wall of the insertion tube; when the protective cover is in the second state, the clamping portion is stopped and limited within the clamping groove.

[0017] In some solutions, the insertion portion further includes a toggling member; the toggling member can move axially along the insertion tube and is used to toggle the clamping portion away from the clamping groove;

[0018] The protective cover is provided with a reset rib, and the reset rib has a folded form and an unfolded form; when the clamping portion leaves the clamping groove, the reset rib is switched from the folded form to the unfolded form and drives the protective cover to be switched from the second state to the first state.

[0019] In a second aspect, an endoscope is disclosed, which includes an endoscope handle and the insertion portion of the first aspect;

[0020] The proximal end of the insertion tube is connected to the endoscope handle.

[0021] In a third aspect, a medical device is disclosed, which includes the endoscope of the second aspect or the insertion portion of the first aspect; the medical device further includes a sheath tube;

[0022] The insertion portion is arranged inside the sheath tube and can move axially along the sheath tube;

[0023] A water return channel is formed between the inner wall of the sheath tube and the outer wall of the insertion tube, and the water flow flowing from the opening to the outside of the protective cover can be discharged out of the sheath tube through the water return channel.

[0024] In some solutions, the maximum diameter of the distal end of the protective cover is greater than or equal to or less than the inner diameter of the sheath tube;

[0025] And / or, the opening and the water return channel are configured such that: within a unit time, the water flow rate passing through the opening is greater than the water flow rate passing through the maximum cross-section of the water return channel.

[0026] In some solutions, when the maximum diameter of the distal end of the protective cover is greater than or equal to the inner diameter of the sheath tube, the insertion portion is configured during the movement in the sheath tube as follows:

[0027] One side of the protective cover along its radial direction abuts against one side of the inner wall of the sheath tube along its radial direction, so that one side of the protective cover along its radial direction and at least part of the insertion tube abut against the other side of the inner wall of the sheath tube along its radial direction.

[0028] The technical solutions adopted by the present invention can achieve the following beneficial effects:

[0029] During the operation, the insertion part of the present application inserts the insertion tube into the patient's body cavity and makes the protective cover cover the stone. The optical fiber enters the patient's body cavity through the instrument channel to break the stone. Moreover, due to the presence of the protective cover, the splashing route of the broken stone is restricted by the protective cover and is generally intercepted by the protective cover and splashes inside the protective cover, which can avoid the splashing of the crushed stone to the hard-to-aspirate corners in the distance to a certain extent, thereby reducing the possibility of stone residue. During the process of the optical fiber breaking the stone, the flushing liquid enters the patient's body cavity through the instrument channel to flush the patient's stone, keeping the surgical field clear, and the water flow can drive the broken stone to flow through the opening to the outside of the protective cover and finally be discharged from the patient's body cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 is the axonometric view of the medical device of the present invention;

[0032] Figure 2 is the partial structural schematic diagram of the insertion part of the present invention Figure 1 ;

[0033] Figure 3 is the partial structural schematic diagram of the insertion part of the present invention Figure 2 ;

[0034] Figure 4 is the partial structural schematic diagram of the insertion part of the present invention Figure 3 ;

[0035] Figure 5 is the partial structural schematic diagram of the insertion part of the present invention Figure 4 ;

[0036] Figure 6 is Figure 5 the enlarged view of part A in

[0037] Figure 7 is the partial structural schematic diagram of the insertion part of the present invention Figure 5 ;

[0038] Figure 8 is the partial structural schematic diagram of the insertion part of the present invention Figure 6 ;

[0039] Figure 9 is the partial structural schematic diagram of the insertion part of the present inventionFigure 7 ;

[0040] Figure 10 It is an axonometric view of the protective cover of the present invention.

[0041] In the figure: 100, insertion part; 110, insertion tube; 111, instrument channel; 112, slot; 120, protective cover; 121, through hole; 122, notch; 123, reset rib; 124, clamping part; 130, optical fiber; 140, toggle member; 200, endoscope; 210, endoscope handle; 300, medical device; 310, sheath; 311, water return channel. DETAILED DESCRIPTION

[0042] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0043] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0044] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of each component relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0045] The inventor discovered during the kidney stone surgery that during the lithotripsy surgery, the optical fiber would generate strong energy, causing the stones to break up quickly and splash out at a high speed. Some of the splashed stone fragments may escape the surgical field and enter the narrow part of the renal calyx, resulting in the stone fragments not being completely discharged from the patient's body.

[0046] The following is combined with Figures 1 to 10 , an insertion portion 100, an endoscope 200 and a medical device 300 provided in the present application are described in detail through specific embodiments and their application scenarios.

[0047] Some embodiments of the present application provide an insertion portion 100, as Figures 1 - 10 shown, including an insertion tube 110, a protective cover 120, and a toggling member 140.

[0048] As Figures 2 - 4 and Figures 7 - 9 shown, the insertion tube 110 is provided with an instrument channel 111 for water flow and the optical fiber 130 to pass through along its own axial direction. The insertion tube 110 is used to enter the human body cavity and reach the stone area.

[0049] Water can enter the stone area through the instrument channel 111. During the operation, there may be blood, crushed stone fragments, or other impurities in the stone and its surrounding environment, which will interfere with the doctor's vision. By flushing water, the surgical field of view can be kept clear, enabling the doctor to accurately judge the position, size, and shape of the stone, and thus perform the surgical operation more precisely.

[0050] Moreover, during the lithotripsy process, the stone will be crushed into small pieces for excretion. Flushing water can help these crushed stone fragments flush out of the body faster and reduce the possibility of stone residue.

[0051] The optical fiber 130 is used to conduct the laser generated by the laser generator to the position of the stone in the human body, and precisely crush the stone into fine particles for easy excretion of the stone from the patient's body.

[0052] Among them, the human body cavity in this embodiment refers to the urethra, and the stone area refers to the location of the stone in the kidney. The distal end of the insertion tube 110 enters the kidney through the urethra, and then starts to crush the stone.

[0053] In some embodiments, there is one instrument channel 111. The optical fiber 130 and the water flow share one instrument channel 111.

[0054] In some embodiments, there are two instrument channels 111. The optical fiber 130 and the water flow respectively occupy one instrument channel 111.

[0055] Among them, this embodiment preferably adopts the scheme of one instrument channel 111. Since the diameter of the optical fiber 130 is relatively thin, when the optical fiber 130 is in the instrument channel 111, it will not occupy too much space in the instrument channel 111, and can ensure that the flow rate of water entering the kidney through the instrument channel 111 per unit time meets the usage requirements. The method of setting two instrument channels 111, although separating the optical fiber 130 and the water flow, increases the processing difficulty of the insertion portion 100. Therefore, this embodiment adopts the scheme of one instrument channel 111, which not only ensures that the flow rate of water meets the usage requirements but also reduces the processing difficulty of the insertion portion 100.

[0056] Correspondingly, a camera module is integrated at the distal end of the insertion tube 110. When the insertion tube 110 enters the kidney through the urethra, the camera module can obtain the field of view at the distal end of the insertion tube 110 in real time, and then locate the position of the stone.

[0057] As Figures 2 - 4 and Figures 7 - 9 shown, the protective cover 120 is arranged at the distal end of the insertion tube 110 for covering the stone. During the stone operation, the protective cover 120 covers the stone, playing a role in blocking the splashing stone, preventing the splashing stone from entering the narrow part of the renal calyx, and thus reducing the possibility of stone residue.

[0058] As Figure 10 shown, the circumferential wall of the protective cover 120 is provided with an opening. During the process of the optical fiber 130 breaking the stone, it is necessary to flush the stone with water and discharge the stone from the patient's body through the water flow. Therefore, an opening is arranged on the circumferential wall of the protective cover 120, and the water flow flushing the stone carries the broken stone and flows out of the protective cover 120 from the opening, and finally discharges from the patient's body.

[0059] Specifically, as Figure 10 shown, the opening includes a through hole 121 arranged in the middle of the circumferential wall of the protective cover 120 and / or a plurality of notches 122 arranged at the distal end of the protective cover 120. The water flow flushing the stone carries the broken stone and flows out of the protective cover 120 from the through hole 121 in the middle and the plurality of notches 122 at the distal end, and finally discharges from the patient's body. Moreover, the through hole 121 arranged in the middle of the circumferential wall of the protective cover 120 can shorten the return water path, enabling the water flow to carry the stone and be discharged to the outside of the protective cover 120 along a shorter path.

[0060] In some embodiments, the opening includes a through hole 121 arranged in the middle of the circumferential wall of the protective cover 120.

[0061] In some embodiments, the opening includes a plurality of notches 122 arranged at the distal end of the protective cover 120.

[0062] In some embodiments, the opening includes a through hole 121 arranged in the middle of the circumferential wall of the protective cover 120 and a plurality of notches 122 arranged at the distal end of the protective cover 120.

[0063] A number of notches 122 are provided at the distal end of the protective cover 120. After an external force acts on the distal end of the protective cover 120, the gaps between the multiple notches 122 increase, causing the distal end of the protective cover 120 to move radially outward. During a lithotomy operation, by moving the insertion tube 110, the distal end of the protective cover 120 gradually approaches the calculus and finally abuts against the renal wall or the calculus. As the distal end of the insertion tube 110 continues to move toward the kidney, the distal end of the protective cover 120 is stressed, causing the gaps between the multiple notches 122 to increase, thereby causing the distal end of the protective cover 120 to move radially outward, increasing the area that the distal end of the protective cover 120 can cover the calculus. At the same time, it also avoids excessive force being transmitted from the distal end of the protective cover 120 to the renal wall or the calculus. Therefore, during a lithotomy operation, when the distal end of the protective cover 120 abuts against the renal wall or the calculus, the doctor can move the insertion tube 110 back and forth within a certain range, change the force on the distal end of the protective cover 120, and adjust the area covered by the distal end of the protective cover 120.

[0064] Correspondingly, the protective cover 120 is made of a deformable material, so that after an external force acting along the axial direction of the instrument channel acts on the distal end of the protective cover 120, it can move radially outward.

[0065] Among them, the number of notches 122 can be 2, 3, 4, 5 or more, which can be flexibly set according to the usage requirements, and this embodiment does not limit this.

[0066] As Figures 2 - 4 shown, the diameter of the distal end of the protective cover 120 is greater than or equal to the diameter of the proximal end of the protective cover 120. By setting the diameter of the distal end of the protective cover 120 to be greater than or equal to the diameter of the proximal end of the protective cover 120, it can be ensured that the distal end of the protective cover 120 can cover a calculus of a certain size to meet the usage requirements.

[0067] In some embodiments, the diameter of the distal end of the protective cover 120 is greater than the diameter of the proximal end of the protective cover 120.

[0068] In some embodiments, the diameter of the distal end of the protective cover 120 is equal to the diameter of the proximal end of the protective cover 120.

[0069] As Figures 2 - 8 shown, the protective cover 120 has a fixed end and a free end, and the fixed end is connected to the distal end of the insertion tube 110. The protective cover 120 is configured to have a first state and a second state; when the protective cover 120 is in the first state, the free end extends beyond the distal end of the insertion tube 110 in the axial direction of the insertion tube 110; when the protective cover 120 is in the second state, the free end abuts against the outer peripheral wall of the insertion tube 110.

[0070] During the process of kidney stone surgery, the distal end of the insertion tube 110 needs to enter the kidney through the urethra. Since the space inside the urethra is narrow and curved, and the protective cover 120 has a relatively small stiffness, during the movement of the insertion tube 110 inside the urethra, the protective cover 120 is prone to being hindered and deformed, increasing the friction force when the insertion tube 110 moves inside the urethra. Therefore, the protective cover 120 is set to have a first state and a second state. During the movement of the insertion tube 110 inside the urethra, the protective cover 120 is in the second state. At this time, the free end of the protective cover 120 abuts against the outer peripheral wall of the insertion tube 110, making the protective cover 120 fit as closely as possible to the outer peripheral wall of the insertion tube 110, avoiding the situation where the protective cover 120 is squeezed and deformed during the movement of the insertion tube 110 inside the urethra, and thus reducing the friction force when the insertion tube 110 moves inside the urethra. When the distal end of the insertion tube 110 enters the kidney through the urethra, the protective cover 120 is in the first state. At this time, the free end of the protective cover 120 extends beyond the distal end of the insertion tube 110 in the axial direction of the insertion tube 110, so that the free end of the protective cover 120 can abut against the kidney wall or the stone.

[0071] In this embodiment, a plurality of notches 122 are provided on the free end of the protective cover 120.

[0072] Correspondingly, the protective cover 120 can be switched from the second state to the first state. After the distal end of the insertion tube 110 enters the kidney through the urethra, the protective cover is switched from the second state to the first state, which not only ensures that the free end of the protective cover 120 can cover the stone, but also ensures that the insertion tube 110 can smoothly pass through the urethra and enter the kidney.

[0073] As Figure 5 and Figure 6 shown, the free end has a clamping portion 124, and a clamping groove 112 is provided on the outer peripheral wall of the insertion tube 110; when the protective cover 120 is in the second state, the clamping portion 124 abuts and is limited within the clamping groove 112. During the movement of the insertion tube 110 inside the urethra, the free end of the protective cover 120 is prone to move towards the distal end of the insertion tube 110 under the action of the friction force, and there may be a situation where the free end of the protective cover 120 extends beyond the distal end of the insertion tube 110 in the axial direction of the insertion tube 110. Therefore, when the protective cover 120 is in the second state, the clamping portion 124 is abutted and limited within the clamping groove 112, increasing the stability of the free end of the protective cover 120 fixed on the insertion tube 110, and thus preferably avoiding the situation where the free end of the protective cover 120 is prone to move towards the distal end of the insertion tube 110 under the action of the friction force during the movement of the insertion tube 110 inside the urethra.

[0074] Preferably in this embodiment, the clamping portion 124 is provided on the free end of the protective cover 120. It goes without saying that the clamping portion 124 can also be provided at other positions of the protective cover 120.

[0075] As shown Figure 6 in FIG. Figure 6 , the toggling member 140 is axially movable along the insertion tube 110 for toggling the latching portion 124 away from the card slot 112. When the distal end of the insertion tube 110 enters the kidney, the toggling member 140 is controlled to move toward the distal end of the insertion tube 110, and the latching portion 124 is toggled to separate from the card slot 112, so that the protective cover 120 can be switched from the second state to the first state.

[0076] In some embodiments, the insertion tube 110 is provided with an operation channel along its axial direction. The distal end of the operation channel communicates with the card slot 112. The toggling member 140 is slidably disposed in the operation channel, and the proximal end of the toggling member 140 extends from the proximal end of the insertion tube 110 to the outside of the insertion tube 110. When the distal end of the insertion tube 110 enters the kidney, the doctor controls the proximal end of the toggling member 140 to move in the distal direction, so that the distal end of the toggling member 140 gradually approaches the card slot 112 and finally abuts against the latching portion 124, pushing the latching portion 124 to separate from the card slot 112.

[0077] In some embodiments, the toggling member 140 is slidably disposed outside the insertion tube 110, and the proximal end of the toggling member 140 extends to the outside of the insertion tube 110. When the distal end of the insertion tube 110 enters the kidney, the doctor controls the proximal end of the toggling member 140 to move in the distal direction, so that the distal end of the toggling member 140 gradually approaches the card slot 112 and finally abuts against the latching portion 124, pushing the latching portion 124 to separate from the card slot 112.

[0078] As shown Figure 10 in FIG. Figure 10 , the protective cover 120 is provided with a reset rib 123. The reset rib 123 has a folded form and an unfolded form. When in the folded form, the reset rib 123 can store a certain amount of elastic potential energy, and the elastic potential energy is released through the reset rib 123, so that the reset rib 123 is switched from the folded form to the unfolded form.

[0079] After the latching portion 124 leaves the card slot 112, the reset rib 123 is switched from the folded form to the unfolded form. The elastic potential energy released through the reset rib 123 drives the protective cover 120 to be switched from the second state to the first state. When the distal end of the insertion tube 110 enters the kidney, the protective cover 120 needs to be switched from the second state to the first state. The setting of the reset rib 123 drives the protective cover 120 to unfold in a non-powered manner and can make this process more reliable and efficient.

[0080] Among them, the reset rib 123 is made of shape memory alloy. After the protective cover 120 is switched from the second state to the first state, the shape memory alloy can make the protective cover 120 unfold into a preset shape to meet the use requirements.

[0081] In this embodiment, the number of reset ribs 123 can be 1, 2, 3 or more, which can be flexibly set according to actual usage requirements, and this embodiment does not limit this.

[0082] Some embodiments of the present application also disclose an endoscope 200, as Figure 1 shown, including an endoscope handle 210 and an insertion portion 100.

[0083] As Figure 1 and Figure 2 shown, the proximal end of the insertion tube 110 is connected to the endoscope handle 210. The optical fiber 130 is inserted into the instrument channel 111 from the instrument nozzle of the endoscope handle 210.

[0084] Some embodiments of the present application also disclose a medical device 300, as Figures 2 - 9 shown, including a sheath tube 310 and the insertion portion 100 or the endoscope 200.

[0085] As Figures 2 - 4 and Figures 7 - 9 shown, the insertion tube 110 is arranged inside the sheath tube 310 and can move along the axial direction of the sheath tube 310. During a kidney stone operation, the sheath tube 310 is first pre-inserted into the patient's urethra to establish a passage, and then the insertion tube 110 enters the kidney along the passage established by the sheath tube 310.

[0086] Among them, the process of the insertion tube 110 moving in the urethra mentioned above refers to the process of the urethra moving in the passage established by the sheath tube 310.

[0087] As Figures 2 - 4 shown, the maximum diameter of the distal end of the protective cover 120 is greater than or equal to or less than the inner diameter of the sheath tube 310. In the above three ways, the protective cover 120 can move along the passage established by the sheath tube 310.

[0088] In some embodiments, the maximum diameter of the distal end of the protective cover 120 is greater than the inner diameter of the sheath tube 310.

[0089] In some embodiments, the maximum diameter of the distal end of the protective cover 120 is equal to the inner diameter of the sheath tube 310.

[0090] In some embodiments, the maximum diameter of the distal end of the protective cover 120 is less than the inner diameter of the sheath tube 310.

[0091] It should be noted that in this embodiment, the diameter of the distal end of the protective cover 120 is not less than the diameter of the proximal end of the protective cover 120.

[0092] In embodiments where the maximum diameter of the distal end of the protective cover 120 is greater than or equal to the inner diameter of the sheath tube 310, as Figure 2 and Figure 3As shown, during the movement of the insertion part 100 within the sheath tube 310, it is configured such that one side of the protective cover 120 along its radial direction abuts against one side of the inner wall of the sheath tube 310 along its radial direction, so that one side of the protective cover 120 along its radial direction and at least part of the insertion tube 110 abut against the other side of the inner wall of the sheath tube 310 along its radial direction.

[0093] After the kidney stone surgery is completed, the doctor pulls out the insertion tube 110 outward and makes the protective cover 120 move proximally along the sheath tube 310. Since the protective cover 120 cannot be switched from the first state to the second state, during the movement of the protective cover 120 proximally along the sheath tube 310, the protective cover 120 will be squeezed and deformed, so that one side of the protective cover 120 along its radial direction abuts against one side of the inner wall of the sheath tube 310 along its radial direction, and further one side of the protective cover 120 along its radial direction and at least part of the insertion tube 110 abut against the other side of the inner wall of the sheath tube 310 along its radial direction, so as to increase the maximum size of the water return channel 311 as much as possible, improve the passability of the stone, and prevent the stone from getting stuck in the water return channel 311.

[0094] It should be noted that the protective cover 120 is for single use. During the movement of the protective cover 120 proximally along the sheath tube 310, even if the protective cover 120 is damaged, it will not cause any impact. Therefore, there is no need to set up an additional mechanism to enable the protective cover 120 to be switched from the first state to the second state.

[0095] In an embodiment where the maximum diameter at the distal end of the protective cover 120 is greater than the inner diameter of the sheath tube 310, as Figure 2 shown, the strength of one side of the protective cover 120 along the radial direction is greater than that of the other side. When the protective cover 120 moves proximally along the sheath tube 310, the side of the protective cover 120 with greater strength has a smaller degree of deformation and is in line contact or surface contact with the inner wall of the sheath tube 310, and the side with smaller strength has a greater degree of deformation and fits as closely as possible to the inner wall of the sheath tube 310.

[0096] In an embodiment where the maximum diameter at the distal end of the protective cover 120 is equal to the inner diameter of the sheath tube 310, as Figure 3 shown, when the protective cover 120 is in the first state and outside the sheath tube 310, the projection of the protective cover 120 along the axial direction of the sheath tube 310 has one side exceeding the sheath tube 310 in the radial direction and the other side not exceeding the sheath tube 310. When the protective cover 120 moves proximally along the sheath tube 310, the side of the protective cover 120 that exceeds the sheath tube 310 in the radial direction will be squeezed and deformed, so that the other side of the protective cover 120 that does not exceed the sheath tube 310 in the radial direction fits as closely as possible to the inner wall of the sheath tube 310.

[0097] Preferably in this embodiment, within a unit time, the water flow rate passing through the opening is greater than the water flow rate passing through the maximum cross-section of the return water channel 311. With such a setting, the space of the return water channel 311 can be utilized to the greatest extent, and the efficiency of the water flow carrying the calculus out of the patient's body through the return water channel 311 can be accelerated.

[0098] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0099] In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0100] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. An insertion portion, characterized in that: Includes insertion tube and protective cover; The insertion tube is provided with an instrument channel along its axial direction for water to flow out and for the optical fiber to pass through. The insertion tube is used to be arranged in the sheath tube and can move along the axial direction of the sheath tube. A water return channel is formed between the inner wall of the sheath tube and the outer wall of the insertion tube. The protective cover is arranged at the distal end of the insertion tube and around the instrument channel, and is used to cover at least a part of the area of ​​the stone, and its circumferential wall is provided with an opening for allowing water to flow from inside the protective cover to outside the protective cover; The water flowing out of the instrument channel can carry the stones broken by the optical fiber and flow to the outside of the protective cover through the opening, and then can be discharged to the outside of the sheath through the return water channel.

2. An insertion portion according to claim 1, characterized in that: The opening includes a through hole arranged in the middle of the circumferential wall of the protective cover and / or a plurality of notches arranged at the distal end of the protective cover; The water flowing out of the instrument channel can flow to the outside of the protective cover through the through hole and the multiple notches; and / or, after the distal end of the protective cover is subjected to an external force along the axial direction of the instrument channel, the gaps between the multiple notches increase, causing the distal end of the protective cover to move radially outward.

3. An insertion portion according to claim 1, characterized in that: The distal end diameter of the protective cover is larger than the proximal end diameter of the protective cover; Alternatively, the distal diameter of the protective cover is equal to the proximal diameter of the protective cover.

4. An insertion portion according to claim 1, characterized in that: The protective cover has a fixed end and a free end, and the fixed end is connected to the distal end of the insertion tube; The protective cover is configured to have a first state and a second state; when the protective cover is in the first state, the free end extends beyond the distal end of the insertion tube in the axial direction of the insertion tube; when the protective cover is in the second state, the free end abuts against the outer peripheral wall of the insertion tube; Wherein, the protective cover can be switched from the second state to the first state.

5. An insertion portion according to claim 4, characterized in that: The free end has a clamping portion, and the outer peripheral wall of the insertion tube is provided with a clamping groove; when the protective cover is in the second state, the clamping portion is stopped and limitedly located in the clamping groove.

6. An insertion portion according to claim 5, characterized in that: The inserting portion further comprises a toggle member; the toggle member can move along the axial direction of the inserting tube, and is used to toggle the clamping portion away from the clamping slot; The protective cover is provided with a reset rib, and the reset rib has a folded state and an unfolded state; when the clamping portion leaves the clamping slot, the reset rib switches from the folded state to the unfolded state, and drives the protective cover to switch from the second state to the first state.

7. An endoscope, characterized in that: comprising an endoscope handle and an insertion portion according to any one of claims 1 to 6; The proximal end of the insertion tube is connected to the endoscope handle.

8. A medical device, characterized in that: The medical device comprises the endoscope according to claim 7 or the insertion portion according to any one of claims 1 to 6; the medical device further comprises a sheath; The insertion portion is disposed in the sheath tube and is movable along the axial direction of the sheath tube; A water return channel is formed between the inner wall of the sheath tube and the outer wall of the insertion tube, and water flowing from the opening to the outside of the protective cover can be discharged to the outside of the sheath tube through the water return channel.

9. A medical device according to claim 8, characterized in that: The maximum diameter of the distal end of the protective cover is greater than, equal to, or less than the inner diameter of the sheath tube; And / or, the opening includes and the water return channel is configured such that: within a unit time, the water flow rate passing through the opening is greater than the water flow rate passing through the maximum cross-section of the water return channel.

10. A medical device according to claim 9, characterized in that: When the maximum diameter of the distal end of the protective cover is greater than or equal to the inner diameter of the sheath tube, the insertion portion is configured as follows during movement in the sheath tube: One radial side of the protective cover abuts against one radial side of the inner wall of the sheath tube, so that one radial side of the protective cover and at least part of the insertion tube abut against another radial side of the inner wall of the sheath tube.

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