Insertion part, endoscope and medical instrument

Abstract

The invention relates to the technical field of medical instruments, and discloses an insertion part, an endoscope and a medical instrument. The insertion part comprises an insertion tube and a protection cover; the insertion tube is provided with an instrument channel along the axial direction of the insertion tube, and the water flow and the optical fiber pass through the instrument channel; the protective cover is arranged at the far end of the insertion tube and used for covering the calculus, and an opening is formed in the circumferential wall of the protective cover; water 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 portion. The medical instrument comprises a sheath tube and an insertion part or an endoscope. By means of the scheme, the technical problem of stone splashing existing in stone breaking in the related technology can be solved.

Description

Technical Field

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

[0002] Endoscope is a commonly used medical device, which is an inspection instrument that can directly enter the natural channels of the human body and provide doctors with sufficient diagnostic information to treat diseases. In the operation of lithotripsy, the lithotripsy is easy to splash, resulting in the lithotripsy not being completely discharged from the patient's body.

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

[0004] The invention discloses an insertion part, an endoscope and a medical device to solve the technical problem of stone splashing in the related art of stone crushing.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions: In a first aspect, an insertion portion is disclosed, comprising an insertion tube and a protective cover; The insertion tube is provided with an instrument channel along its axial direction for water flow and optical fiber to pass through; The protective cover is arranged at the distal end of the insertion tube and around the instrument channel to cover at least a part of the stone, and its circumferential wall is provided with openings; the water flowing out of the instrument channel can flow to the outside of the protective cover through the openings.

[0006] In some embodiments, the opening includes a through hole disposed in the middle of the circumferential wall of the protective cover and / or a plurality of notches disposed 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 gaps; 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 gaps increase, causing the distal end of the protective cover to move radially outward.

[0007] In some embodiments, the distal diameter of the protective cover is greater than the proximal diameter of the protective cover; Alternatively, the distal diameter of the protective cover is equal to the proximal diameter of the protective cover.

[0008] In some embodiments, 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; The protective cover can be switched from the second state to the first state.

[0009] In some schemes, 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 limited in the clamping groove.

[0010] In some embodiments, the insertion portion further includes a toggle member; the toggle member can move along the axial direction of the insertion tube to toggle the clamping portion out of the clamping slot; The protective cover is provided with a reset rib, which 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.

[0011] In a second aspect, an endoscope is disclosed, comprising an endoscope handle and an insertion portion of the first aspect; The proximal end of the insertion tube is connected to the endoscope handle.

[0012] In a third aspect, a medical device is disclosed, comprising the endoscope of the second aspect or the insertion portion of the first aspect; the medical device further comprises a sheath; The insertion portion is 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, and the 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.

[0013] In some embodiments, 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; And / or, the opening and the water return channel are configured such that: within a unit time, the water flow rate through the opening is greater than the water flow rate through the maximum cross-section of the water return channel.

[0014] In some embodiments, when the maximum diameter of the distal end of the protective cover is greater than or equal to the inner diameter of the sheath, the insertion portion is configured as follows during movement in the sheath: 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 the other radial side of the inner wall of the sheath tube.

[0015] The technical solution adopted by the present invention can achieve the following beneficial effects: The insertion part of the present application inserts the insertion tube into the patient's body cavity during surgery, and the protective cover covers the stones. The optical fiber enters the patient's body cavity through the instrument channel to crush the stones. In addition, due to the presence of the protective cover, the splashing route of the crushed stones is limited by the protective cover, and they are generally intercepted by the protective cover and splashed in the protective cover, which can to a certain extent prevent the crushed stones from splashing to distant corners that are difficult to aspirate, thereby reducing the possibility of residual stones. In the process of crushing stones by optical fiber, the flushing fluid enters the patient's body cavity through the instrument channel to flush the patient's stones, keeping the surgical field clear, and the water flow can drive the crushed stones to flow through the opening to the outside of the protective cover, and finally discharged out of the patient's body cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is an axonometric view of the medical device of the present invention; Figure 2 This is a partial structural diagram of the insertion part of the present invention. Figure 1 ; Figure 3 This is a partial structural diagram of the insertion part of the present invention. Figure 2 ; Figure 4 This is a partial structural diagram of the insertion part of the present invention. Figure 3 ; Figure 5 This is a partial structural diagram of the insertion part of the present invention. Figure 4 ; Figure 6 yes Figure 5 The enlarged view of point A in the middle; Figure 7 This is a partial structural diagram of the insertion part of the present invention. Figure 5 ; Figure 8 This is a partial structural diagram of the insertion part of the present invention. Figure 6 ; Fig. 9 This is a partial structural diagram of the insertion part of the present invention. Figure 7 ; Fig.10 It is an axonometric view of the protective cover of the present invention.

[0018] 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

[0019] 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.

[0020] 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.

[0021] 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".

[0022] 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.

[0023] 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.

[0024] Some embodiments of the present application provide an insertion portion 100, such as Figure 1-Figure 10 As shown, the invention comprises an insertion tube 110 , a protective cover 120 and a toggle member 140 .

[0025] like Figure 2-Figure 4 and Figure 7-Figure 9 As shown, the insertion tube 110 is provided with an instrument channel 111 along its axial direction for water flow and optical fiber 130 to pass through. The insertion tube 110 is used to enter the human body cavity and reach the stone area.

[0026] The water flow can enter the stone area through the instrument channel 111. During the operation, the stone and its surrounding environment may contain blood, stone fragments or other impurities, which will interfere with the doctor's vision. By flushing water, the surgical field of view can be kept clear, allowing the doctor to accurately determine the location, size and shape of the stone, thereby performing the operation more accurately.

[0027] Also, during the lithotripsy process, the stones are broken into smaller pieces for easier excretion. Flushing can help these broken pieces to be flushed out of the body faster, reducing the possibility of residual stones.

[0028] The optical fiber 130 is used to transmit the laser light generated by the laser generator to the location of the stones in the human body, and accurately break the stones into small particles, so as to facilitate the discharge of the stones from the patient's body.

[0029] 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 begins to break up the stone.

[0030] In some embodiments, the number of the instrument channel 111 is one, and the optical fiber 130 and the water flow occupy the same instrument channel 111 .

[0031] In some embodiments, there are two instrument channels 111 , and the optical fiber 130 and the water flow each occupy one instrument channel 111 .

[0032] Among them, this embodiment preferably uses a solution with 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 much space of the instrument channel 111, and can ensure that the flow rate of water entering the kidney through the instrument channel 111 meets the use requirements within a unit time. Although the method of setting two instrument channels 111 separates the optical fiber 130 and the water flow, it increases the processing difficulty of the insertion part 100. Therefore, this embodiment adopts a solution with one instrument channel 111, which ensures that the flow rate of the water flow meets the use requirements and reduces the processing difficulty of the insertion part 100.

[0033] 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 visual field of the distal end of the insertion tube 110 in real time, and then find the location of the stone.

[0034] like Figure 2-Figure 4 and Figure 7-Figure 9 As shown, the protective cover 120 is arranged at the distal end of the insertion tube 110 to cover the stone. During the stone surgery, the protective cover 120 covers the stone and blocks the splashing stone, thereby preventing the splashing stone from entering the narrow part of the renal calyx, thereby reducing the possibility of stone residue.

[0035] like Fig.10 As shown, the circumferential wall of the protective cover 120 is provided with an opening. In the process of crushing stones by the optical fiber 130, water flow is required to wash the stones and carry the stones out of the patient's body through the water flow. Therefore, the circumferential wall of the protective cover 120 is provided with an opening, and the water flow for washing the stones carries the crushed stones to flow from the opening to the outside of the protective cover 120, and finally is discharged from the patient's body.

[0036] Specifically, Fig.10 As shown, the opening includes a through hole 121 disposed in the middle of the circumferential wall of the protective cover 120 and / or a plurality of notches 122 disposed at the distal end of the protective cover 120. The water flow for washing the stones carries the broken stones from the through hole 121 in the middle and the plurality of notches 122 at the distal end to the outside of the protective cover 120, and is finally discharged from the patient's body. In addition, the through hole 121 disposed in the middle of the circumferential wall of the protective cover 120 can shorten the return water distance, so that the stones carried by the water flow can be discharged to the outside of the protective cover 120 in a shorter path.

[0037] In some embodiments, the opening includes a through hole 121 disposed in the middle of the circumferential wall of the protective cover 120 .

[0038] In some embodiments, the opening includes a plurality of notches 122 disposed at a distal end of the protective cover 120 .

[0039] In some embodiments, the opening includes a through hole 121 disposed in the middle of the circumferential wall of the protective cover 120 and a plurality of notches 122 disposed at the distal end of the protective cover 120 .

[0040] The distal end of the protective cover 120 is provided with a plurality of notches 122. When the distal end of the protective cover 120 is acted upon by an external force, the gaps between the plurality of notches 122 increase, so that the distal end of the protective cover 120 moves radially outward. During stone surgery, by moving the insertion tube 110, the distal end of the protective cover 120 gradually approaches the stone, and finally stops against the kidney wall or the stone. As the distal end of the insertion tube 110 continues to move toward the kidney, the distal end of the protective cover 120 is subjected to force, so that the gaps between the plurality of notches 122 increase, and the distal end of the protective cover 120 moves radially outward, increasing the area of ​​the stone that can be covered by the distal end of the protective cover 120. At the same time, it also prevents the distal end of the protective cover 120 from transmitting excessive force to the kidney wall or the stone. Therefore, during stone surgery, when the distal end of the protective cover 120 stops against the kidney wall or the stone, the doctor can move the insertion tube 110 back and forth within a certain range to 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.

[0041] Accordingly, the protective cover 120 is made of a deformable material, so that the distal end of the protective cover 120 can move radially outward after being acted upon by an external force along the axial direction of the instrument channel.

[0042] The number of the notches 122 may be 2, 3, 4, 5 or more, and may be flexibly set according to usage requirements, which is not limited in this embodiment.

[0043] like Figure 2-Figure 4 As shown, the distal diameter of the protective cover 120 is greater than or equal to the proximal diameter of the protective cover 120. By setting the distal diameter of the protective cover 120 to be greater than or equal to the proximal diameter of the protective cover 120, it can be ensured that the distal end of the protective cover 120 can cover stones of a certain size to meet the use requirements.

[0044] In some embodiments, the distal diameter of the protective cover 120 is greater than the proximal diameter of the protective cover 120 .

[0045] In some embodiments, the distal diameter of the protective cover 120 is equal to the proximal diameter of the protective cover 120 .

[0046] like Figure 2-Figure 8 As 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 exceeds 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.

[0047] During the kidney stone surgery, the distal end of the insertion tube 110 needs to enter the kidney through the urethra. Since the space in the urethra is narrow and curved, and the protective cover 120 has a small rigidity, the protective cover 120 is easily blocked and deformed during the movement of the insertion tube 110 in the urethra, which increases the friction force of the insertion tube 110 when it moves in 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 in 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, so that the protective cover 120 fits the outer peripheral wall of the insertion tube 110 as closely as possible, avoiding the occurrence of the situation where the protective cover 120 is squeezed and deformed during the movement of the insertion tube 110 in the urethra, thereby reducing the friction force of the insertion tube 110 when it moves in the urethra. When the distal end of the insertion tube 110 passes through the urethra and enters the kidney, the protective cover 120 is in the first state, at which time the free end of the protective cover 120 extends axially beyond the distal end of the insertion tube 110, so that the free end of the protective cover 120 can stop against the kidney wall or stones.

[0048] In this embodiment, a plurality of notches 122 are disposed on the free end of the protection cover 120 .

[0049] Correspondingly, the protective cover 120 can be switched from the second state to the first state. When the distal end of the insertion tube 110 passes through the urethra and enters the kidney, the protection is switched from the second state to the first state, which ensures that the free end of the protective cover 120 can cover the stones and that the insertion tube 110 can smoothly pass through the urethra and enter the kidney.

[0050] like Figure 5 and Figure 6 As shown, the free end has a clamping portion 124, and the outer peripheral wall of the insertion tube 110 is provided with a clamping groove 112; when the protective cover 120 is in the second state, the clamping portion 124 is stopped and limited in the clamping groove 112. In the process of the insertion tube 110 moving in the urethra, the free end of the protective cover 120 is easy to move toward the distal end of the insertion tube 110 under the action of friction, and there may be a situation where the free end of the protective cover 120 exceeds 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 stopped and limited in the clamping groove 112, which increases the stability of the free end of the protective cover 120 fixed on the insertion tube 110, thereby better avoiding the situation that the free end of the protective cover 120 is easy to move toward the distal end of the insertion tube 110 under the action of friction in the process of the insertion tube 110 moving in the urethra.

[0051] As a preferred embodiment of the present invention, the clamping portion 124 is disposed on the free end of the protective cover 120. Of course, the clamping portion 124 can also be disposed at other positions of the protective cover 120.

[0052] like Figure 6 As shown, the toggle member 140 can move along the axial direction of the insertion tube 110 to toggle the clamping portion 124 away from the clamping slot 112. When the distal end of the insertion tube 110 enters the kidney, the toggle member 140 is controlled to move toward the distal end of the insertion tube 110 to toggle the clamping portion 124 away from the clamping slot 112, so that the protective cover 120 is switched from the second state to the first state.

[0053] In some embodiments, the insertion tube 110 is provided with an operation channel along its axial direction, the distal end of the operation channel is communicated with the card slot 112, the toggle member 140 is slidably disposed in the operation channel, and the proximal end of the toggle 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 toggle member 140 to move toward the distal end, so that the distal end of the toggle member 140 gradually approaches the card slot 112, and finally stops on the clamping portion 124, pushing the clamping portion 124 to separate from the card slot 112.

[0054] In some embodiments, the toggle member 140 is slidably disposed outside the insertion tube 110, and the proximal end of the toggle member 140 extends outside the insertion tube 110. When the distal end of the insertion tube 110 enters the kidney, the doctor controls the proximal end of the toggle member 140 to move toward the distal end, so that the distal end of the toggle member 140 gradually approaches the slot 112, and finally stops against the clamping portion 124, pushing the clamping portion 124 to separate from the slot 112.

[0055] like Fig.10 As shown, the protective cover 120 is provided with a reset rib 123, which has a folded form and an unfolded form. When the reset rib 123 is in the folded form, it can store a certain elastic potential energy, and release the elastic potential energy through the reset rib 123, so that the reset rib 123 switches from the folded form to the unfolded form.

[0056] When the clamping portion 124 leaves the clamping slot 112, the reset rib 123 switches from the folded state to the unfolded state, and the elastic potential energy released by the reset rib 123 drives the protective cover 120 to switch 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 switch from the second state to the first state. The reset rib 123 drives the protective cover 120 to unfold in an unpowered manner, and can make this process more reliable and efficient.

[0057] The reset rib 123 is made of a memory alloy. When the protection cover 120 is switched from the second state to the first state, the memory alloy can enable the protection cover 120 to unfold into a preset shape to meet the use requirements.

[0058] In this embodiment, the number of the reset ribs 123 may be 1, 2, 3 or more, and may be flexibly arranged according to actual use requirements, which is not limited in this embodiment.

[0059] Some embodiments of the present application also disclose an endoscope 200, such as Figure 1 As shown, the endoscope comprises an endoscope handle 210 and an insertion portion 100 .

[0060] like Figure 1 and Figure 2 As shown, the proximal end of the insertion tube 110 is connected to the endoscope handle 210. The optical fiber 130 is inserted from the instrument mouth of the endoscope handle 210 and enters into the instrument channel 111.

[0061] Some embodiments of the present application also disclose a medical device 300, such as Figure 2-Figure 9 As shown, the apparatus includes a sheath tube 310 and an insertion portion 100 or an endoscope 200 .

[0062] like Figure 2-Figure 4 and Figure 7-Figure 9 As shown, the insertion tube 110 is disposed in the sheath tube 310 and can move along the axial direction of the sheath tube 310. During the kidney stone surgery, the sheath tube 310 is first inserted into the patient's urethra to establish a passage, and then the insertion tube 110 is inserted into the kidney along the passage established by the sheath tube 310.

[0063] 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 .

[0064] like Figure 2-Figure 4 As shown, the maximum diameter of the distal end of the protective cover 120 is greater than, equal to, or less than the inner diameter of the sheath tube 310. In the above three methods, the protective cover 120 can be moved along the path suggested by the sheath tube 310.

[0065] 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 .

[0066] 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 .

[0067] In some embodiments, the maximum diameter of the distal end of the protective cover 120 is smaller than the inner diameter of the sheath tube 310 .

[0068] 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 .

[0069] In an embodiment 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, Figure 2 and Figure 3As shown, the insertion portion 100 is configured as follows during the movement in the sheath tube 310: one radial side of the protective cover 120 abuts against one radial side of the inner wall of the sheath tube 310, so that one radial side of the protective cover 120 and at least part of the insertion tube 110 abut against the other radial side of the inner wall of the sheath tube 310.

[0070] After the kidney stone surgery is completed, the doctor pulls out the insertion tube 110 and moves the protective cover 120 toward the proximal end along the sheath tube 310. Since the protective cover 120 cannot be switched from the first state to the second state, the protective cover 120 will be squeezed and deformed during the process of the protective cover 120 moving toward the proximal end along the sheath tube 310, so that the protective cover 120 along one side of its radial direction abuts against the inner wall of the sheath tube 310 along one side of its radial direction, and then the protective cover 120 along one side of its radial direction and at least part of the insertion tube 110 abut against the inner wall of the sheath tube 310 along the other side of its radial direction, so as to increase the maximum size of the return water channel 311 as much as possible, increase the passability of the stone, and prevent the stone from being stuck in the return water channel 311.

[0071] It should be noted that the protective cover 120 is disposable, and even if the protective cover 120 is damaged during the process of moving along the sheath tube 310 toward the proximal end, it will not cause any impact. Therefore, there is no need to set up an additional mechanism to enable the protective cover 120 to switch from the first state to the second state.

[0072] In an embodiment where the maximum diameter of the distal end of the protective cover 120 is greater than the inner diameter of the sheath tube 310, as Figure 2 As shown, the strength of one side of the protective cover 120 in the radial direction is greater than the strength of the other side. When the protective cover 120 moves toward the proximal end along the sheath tube 310, the protective cover 120 that is squeezed and deformed has a smaller deformation degree on the side with greater strength and is in line-surface contact or surface-surface contact with the inner wall of the sheath tube 310, while the deformation degree on the side with less strength is greater and fits the inner wall of the sheath tube 310 as much as possible.

[0073] In an embodiment where the maximum diameter of the distal end of the protective cover 120 is equal to the inner diameter of the sheath tube 310, Figure 3 As 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 radially extending beyond the sheath tube 310 and the other side not extending beyond the sheath tube 310. When the protective cover 120 moves toward the proximal end along the sheath tube 310, the side of the protective cover 120 radially extending beyond the sheath tube 310 will be squeezed and deformed, so that the other side of the protective cover 120 radially not extending beyond the sheath tube 310 fits as closely as possible to the inner wall of the sheath tube 310.

[0074] As a preferred embodiment of the present invention, the water flow rate passing through the opening in a unit time is greater than the water flow rate passing through the maximum cross-section of the return channel 311. With such a configuration, the space of the return channel 311 can be utilized to the maximum extent, and the efficiency of the water flow carrying stones out of the patient's body from the return channel 311 can be accelerated.

[0075] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0076] In addition, it should be noted 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 a 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. In addition, features described with reference to certain examples may be combined in other examples.

[0077] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by 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 flow and optical fiber to pass through; The protective cover is arranged at the distal end of the insertion tube and around the instrument channel to cover at least a portion of the stone, and its circumferential wall is provided with an opening; the water flowing out of the instrument channel can flow to the outside of the protective cover through the opening.

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.

Images