Instrument tube assembly, insertion portion, and endoscope

Abstract

The present invention provides an instrument tube assembly, an insertion portion, and an endoscope, relating to the technical field of endoscopes and addressing the problem of poor intrarenal pressure stability when regulating perfusion flow. The instrument tube assembly of the present invention is used in the insertion portion of an endoscope and comprises a first tube segment, a transfer tube segment, and a second tube segment that are sequentially connected. The transfer tube segment is provided with a channel, the inner port of which is located between the proximal end of the first tube segment and the distal end of the second tube segment, and the outer port is positioned on the outer circumference of the passive bending section of the insertion portion. A switch element controls the opening and closing of the channel to allow some perfusion liquid to be discharged into the annular space before reaching the distal end of the first tube segment, establishing partial fluid circulation. This allows for synchronous, undelayed, and matching regulation of the perfusion flow entering the kidney and the suction flow discharged from the kidney without power adjustment of the perfusion pump and suction pump, effectively stabilizing intrarenal pressure and better maintaining intrarenal pressure stability during perfusion pulse generation.

Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, in particular to an instrument tube assembly, an insertion portion and an endoscope. Background Art

[0002] Currently, during transureteral nephrolithotomy for renal calculi, an instrument channel is used to deliver a lithotripsy laser fiber, which serves as an infusion channel for perfusing fluid into the kidney. A sheath is also required to form an annular space between the insertion port and the sheath, creating a return channel to aspirate fluid and the entrained stones. This annular space serves as a return channel to establish a stable fluid circulation and maintain stable intrarenal pressure. Maintaining stable intrarenal pressure requires a consistent infusion and aspiration flow rate. However, in some cases, active regulation of the infusion and / or aspiration flow rates into the kidney is necessary. For example, in some cases, adjustments may be made to maintain a clear view or improve stone clearance efficiency. Due to potential delays or errors in the regulation between the infusion and aspiration pumps, intrarenal pressure can fluctuate beyond the preset value. In other cases, artificial infusion pulses are created to enhance stone clearance. This can lead to intermittent mismatches between the infusion volume into the kidney and the aspiration volume flowing out of the kidney into the annular space, causing significant fluctuations in intrarenal pressure, even exceeding safe intrarenal pressure limits. All of the above situations may increase the complications and occult renal damage related to intrarenal hypertension. Summary of the Invention

[0003] The purpose of the present invention is to design an instrument tube assembly, an insertion portion and an endoscope to solve the problem of poor stability of the intrarenal pressure when adjusting the perfusion flow.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present application provides an instrument tube assembly, which is used for the insertion part of an endoscope. The instrument tube assembly includes an instrument tube and a switch member. The instrument tube includes a first tube segment, a transfer tube segment, and a second tube segment extending axially from the distal end to the proximal end and connected in sequence; the tube wall of the transfer tube segment is provided with a channel running from the inner wall surface to the outer wall surface, the inner port of the channel is located between the proximal tube opening of the first tube segment and the distal tube opening of the second tube segment, and the outer port of the channel is used to be positioned on the outer peripheral surface of the passive bending section of the insertion part; the switch member is correspondingly arranged at the channel for opening and closing the channel in a controlled manner.

[0006] When employing the above-described configuration, the instrument tube assembly includes a channel on its transition tube segment that connects the working channel within the instrument tube with the outside. This channel's timing of opening allows some perfusion fluid that has already entered the instrument tube to be discharged from the working channel before reaching the distal end of the first tube segment. Furthermore, because the channel's outer end is located on the outer circumference of the passively curved section of the insertion portion, fluid discharged from the outer end can directly enter the annular space between the sheath and the insertion portion, allowing the perfusion fluid to establish a partial fluid circulation through the channel. Therefore, controlling the opening and closing of the channel only affects the perfusion flow rate proximal to the inner end of the channel, ultimately flowing into the kidney, and the amount of fluid drawn from the kidney into the annular space distal to the outer end of the channel. It has little impact on the perfusion flow rate distal to the inner end of the channel and the aspiration flow proximal to the outer end. In this way, the degree of opening and closing of the channel can be controlled by controlling the switch element. This allows for synchronous, non-delayed, and matching regulation of the perfusion flow entering the kidney and the suction flow exiting the kidney without adjusting the power of the perfusion and suction pumps, effectively stabilizing intrarenal pressure. By continuously adjusting the degree of opening and closing of the channel, perfusion pulses can be generated at the distal end of the first tube segment, while maintaining stable intrarenal pressure.

[0007] In order to further better implement the present invention, the following configuration is particularly adopted: the distal end of the second tube segment is used to be positioned at the distal end of the passive bending segment of the insertion portion.

[0008] When the above-mentioned setting structure is adopted, the distal end of the second tube section will be set at the distal end of the passive bending section of the insertion part. This will make the inner port of the channel closer to the distal end of the instrument tube while making the path of the channel as short as possible, so that the perfusion pulse can be generated closer to the distal end of the instrument tube to ensure the stone-clearing effect of the perfusion pulse.

[0009] In order to further better implement the present invention, the following configuration is particularly adopted: the outer port of the channel is used to be positioned on the outer peripheral surface of the distal end of the passive bending section of the insertion portion.

[0010] When the above-mentioned setting structure is adopted, the outer port of the channel is further used to be positioned to the distal end of the passive bending section of the insertion part. This can ensure that the channel has a shorter path while ensuring the stone-clearing effect of the perfusion pulse, so that fluid circulation can be quickly established through the channel and the degree of fluctuation of intrarenal pressure can be reduced.

[0011] In order to further better implement the present invention, the following configuration is particularly adopted: the channel gradually expands from its inner end to its outer end.

[0012] To further implement the present invention, the following configuration is particularly adopted: the inner port of the channel is in the shape of a flat mouth, in which the size along the circumference of the transfer tube segment is larger than the size along the axial direction of the transfer tube segment.

[0013] When the above-mentioned structure is adopted, the inner port of the channel is set to a flat shape to reduce the axial span, which can avoid the collision of the instrument with the inner port of the channel when passing through, thereby ensuring the smooth movement of the instrument.

[0014] To further better implement the present invention, the following configuration is particularly adopted: the direction of the channel at its outer end is biased toward the proximal end of the second tube segment.

[0015] When the above-mentioned configuration is adopted, the channel can guide the liquid to flow toward the proximal end, so as to reduce the obstruction to the fluid entering the annular space from the kidney.

[0016] To further implement the present invention, the following configuration is particularly adopted: the distal end and proximal end of the transfer tube segment are respectively provided with a first socket and a second socket for receiving and axially positioning the proximal end of the first tube segment and the distal end of the second tube segment.

[0017] In order to further better realize the present invention, the following setting structure is particularly adopted: the inner circumferential wall of the first socket is provided with a first convex ring extending along its circumference, and the first pipe segment is provided with a first thickened segment with a wall thickness increasing radially outward, and the proximal end of the first convex ring is axially abutted with the distal end of the first thickened segment to prevent the first pipe segment from exiting the first socket; the inner circumferential wall of the second socket is provided with a second convex ring extending along its circumference, and the second pipe segment is provided with a second thickened segment with a wall thickness increasing radially outward, and the distal end of the second convex ring is axially abutted with the proximal end of the second thickened segment to prevent the second pipe segment from exiting the second socket.

[0018] When the above arrangement is adopted, the first thickened section provided at the proximal end of the first tube segment can improve the end's ability to resist collapse, preventing collapse after insertion into the first socket, while also cooperating with the first protruding ring to form a snap-fit ​​structure to prevent disengagement. The second thickened section provided at the distal end of the second tube segment can improve its end's ability to resist collapse, preventing collapse after insertion into the second socket, while also cooperating with the second protruding ring to form a snap-fit ​​structure to prevent disengagement.

[0019] In order to further better implement the present invention, the following setting structure is particularly adopted: the inner ring surface of the first protruding ring contacts the outer peripheral wall of the first pipe segment, and the inner side of the first socket forms a first glue-filling groove around the outer peripheral wall of the first pipe segment on the proximal side of the first protruding ring; the inner ring surface of the second protruding ring contacts the outer peripheral wall of the second pipe segment, and the inner side of the second socket forms a second glue-filling groove around the outer peripheral wall of the second pipe segment on the distal side of the second protruding ring.

[0020] When the above arrangement is adopted, glue can be added to the first glue filling groove to seal the gap between the first pipe section and the first socket to improve the sealing performance. Glue can be added to the second glue filling groove to seal the gap between the second pipe section and the second socket to improve the sealing performance.

[0021] To further better implement the present invention, the following configuration is particularly adopted: the switch element includes a valve plate, a control wire connected to the valve plate, and a reset element; the valve plate is provided with a valve hole; the valve plate can switch between a first position and a second position relative to the channel; in the first position, the valve hole is misaligned with the channel to close the channel; in the second position, the valve hole is aligned with the channel to open the channel; wherein the control wire can drive the valve plate to move from the first position to the second position, and the reset element can drive the valve plate to return from the second position to the first position;

[0022] Alternatively, the switch element includes a frame, a film covering the frame, a first closing line and a second closing line adhered to each other and fixed on the inner side of the frame, and a control line connecting the second closing line, the film is provided with a slit aligned with the channel, opposite sides of the slit are respectively connected to the first closing line and the second closing line to close the channel, the control line can drive the second closing line to deform to separate from the first closing line to open the slit to open the channel, and the second closing line has the ability to recover its deformation to adhere to the first closing line.

[0023] In order to further better implement the present invention, the following configuration structure is particularly adopted: the transfer tube section is provided with a mounting groove, and the switch component is inserted into the mounting groove.

[0024] The present application also provides an insertion portion, which includes the above-mentioned instrument tube assembly, the instrument tube assembly is arranged inside the insertion portion and extends from the distal surface of the insertion portion to the proximal side of the insertion portion, and the outer port of the channel is exposed to the outer peripheral surface of the insertion portion.

[0025] To further implement the present invention, the following configuration is particularly adopted: the insert portion includes a radially outermost skin, which extends axially along the insert portion and is axially disconnected at the channel to expose an outer port of the channel.

[0026] In order to further better realize the present invention, the following setting structure is particularly adopted: the transfer tube section is arranged at the distal end of the passive bending section of the insertion part, and the proximal and distal ends of the transfer tube section are formed with shaft shoulders on the outer peripheral wall. The proximal end of the snake bone of the active bending section of the insertion part and the distal end of the tube shell of the passive bending section are respectively sleeved on the shaft necks of the corresponding shaft shoulders and axially abut the step surfaces of the corresponding shaft shoulders.

[0027] The present application also provides an endoscope, which includes a handle and the above-mentioned insertion part, the proximal end of the insertion part is connected to the handle, the handle is provided with a switch control key, and the switch control key is connected to the switch part for controlling the switch part to open and close the channel.

[0028] The present invention has the following advantages and beneficial effects:

[0029] In the present invention, the instrument tube assembly is provided with a channel on its transition tube segment, connecting the working channel within the instrument tube with the outside. This channel's timing of opening allows some perfusion fluid that has already entered the instrument tube to be discharged from the working channel before reaching the distal end of the first tube segment. Furthermore, because the channel's outer end is located on the outer circumference of the passively curved section of the insertion portion, fluid discharged from the outer end can directly enter the annular space between the sheath and the insertion portion, allowing the perfusion fluid to establish partial fluid circulation through the channel in advance. Therefore, controlling the opening and closing of the channel only affects the perfusion flow rate proximal to the inner end of the channel, which ultimately flows into the kidney, and the amount of fluid drawn from the kidney into the annular space distal to the outer end of the channel. It has little impact on the perfusion flow rate distal to the inner end of the channel and the aspiration flow proximal to the outer end. In this way, the degree of opening and closing of the channel can be controlled by controlling the switch element. This allows for synchronous, non-delayed, and matching regulation of the perfusion flow entering the kidney and the suction flow exiting the kidney without adjusting the power of the perfusion and suction pumps, effectively stabilizing intrarenal pressure. By continuously adjusting the degree of opening and closing of the channel, perfusion pulses can be generated at the distal end of the first tube segment, while maintaining stable intrarenal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0031] Figure 1 This is a schematic diagram of the appearance and structure of an endoscope;

[0032] Figure 2 Shows the installation structure of the switch control key and the handle;

[0033] Figure 3 It is a structural diagram of the insertion part;

[0034] Figure 4 exist Figure 3 The skin was removed from the base;

[0035] Figure 5 A cross-sectional structure of a local area of ​​the insert portion including the transfer tube section is shown;

[0036] Figure 6 It is a cross-sectional structural diagram of an instrument tube assembly;

[0037] Figure 7 Another cross-sectional structure of the insert portion in a local area including the transfer tube section is shown (the second tube section is hidden in the figure);

[0038] Figure 8 is a partial side view of the insertion portion;

[0039] Figure 9 yes Figure 8 AA section view in;

[0040] Figure 10 It is a structural schematic diagram of the transfer tube segment from the proximal side perspective.

[0041] The following are marked in the figure:

[0042] 100. Instrument tube assembly;

[0043] 10. Instrument tube; 11. First tube section; 111. First thickened section;

[0044] 12. Transfer tube section; 121. Passageway; 122. First socket; 123. First raised ring; 124. Second socket; 125. Second raised ring; 126. Mounting groove; 127. Shaft shoulder; 128. Shaft journal; 129. Step surface; 1210. Passageway;

[0045] 13. Second pipe section; 131. Second thickened section;

[0046] 20. Switch member; 21. Valve plate; 211. Valve hole; 22. Control wire; 23. Reset member; 24. Frame; 25. Covering film; 26. First closing wire; 27. Second closing wire; 28. Control wire;

[0047] 30. First glue filling groove;

[0048] 40. Second glue filling groove;

[0049] 200, insertion portion;

[0050] 201, active bending section; 202, snake bone; 203, passive bending section; 204, shell; 205, skin;

[0051] 300. Endoscope; 301. Handle; 302. Switch control key. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other implementations obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0053] In the description of this application, it should be noted that, unless otherwise specified, “plurality” means two or more; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, “front end”, “rear end”, “head”, “tail”, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the data used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects. 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 connected before and after are in an "or" relationship.

[0055] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application depending on the specific circumstances.

[0056] 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".

[0057] The instrument tube assembly 100, the insertion part 200 and the endoscope 300 of the present invention are provided with a channel 121 on the instrument tube 10 at the insertion part, which laterally connects the working channel with the external environment of the insertion part. When the endoscope 300 cooperates with the sheath to perform a surgery that requires the establishment of liquid circulation, such as lithotripsy for the treatment of kidney stones through the ureter, by controlling the opening and closing of the channel 121, the perfusion flow that ultimately enters the kidney can be adjusted without adjusting the total perfusion flow received by the working channel. At the same time, the suction flow from the kidney into the annular space inside the sheath and outside the insertion part 200 can be adjusted without affecting the total suction flow discharged from the annular space. This can make the intrarenal pressure more stable when the perfusion flow entering the kidney needs to be adjusted, especially when generating a perfusion pulse on the distal side of the insertion part 200 to flush the lithotripsy by adjusting the perfusion flow, because the perfusion pulse requires a higher adjustment frequency and the operation is generally more frequent, and adaptively adjusting the suction flow on the endoscope handle or the host will not have enough time to react.

[0058] The following is combined with Figures 1 to 10 , an instrument tube assembly 100, an insertion portion 200 and an endoscope 300 provided in this application are described in detail through specific embodiments and their application scenarios.

[0059] In one aspect, the present invention provides an instrument tube assembly 100 for an insertion portion of an endoscope, such as Figure 6 As shown, the instrument tube assembly 100 includes an instrument tube 10 having a channel 121 and a switch element 20 for controlling the opening and closing of the channel 121. The switch element 20 can control the opening and closing degree of the channel 121 in only two levels: 0% and 100%. For example, the switch element 20 can be a solenoid valve, a piezoelectric plate attached to a port of the channel 121, or the like. The switch element 20 can also control the opening and closing degree of the channel 121 in additional levels between the two levels, such as 50%, 30%, or 70%. Of course, in addition to the above fixed levels, the opening and closing degree of the channel 121 can also be continuously adjusted.

[0060] Figure 5 and Figure 7In the figure, the instrument tube 10 includes a first tube segment 11, a transfer tube segment 12, and a second tube segment 13 extending along its axial direction from the distal end to the proximal end. The first tube segment 11, the transfer tube segment 12, and the second tube segment 13 are simultaneously connected in sequence along the axial direction of the instrument tube 10 from the distal end to the proximal end. A working channel is provided in the instrument tube 10, which runs from the distal end of the first tube segment 11 to the proximal end of the second tube segment 13. The working channel is used for the passage of instruments including holmium laser optical fibers and for receiving and guiding the perfusion liquid to flow toward the distal end.

[0061] like Figure 10 and Figure 6 As shown, the tube wall of the transfer tube section 12 is provided with a through channel 121, which runs from the inner port formed on the inner wall surface of the transfer tube section 12 to the outer port formed on the outer wall surface, thereby connecting the working channel inside the instrument tube 10 with the outer side of the transfer tube section 12.

[0062] The switch member 20 is correspondingly disposed at the channel 121 of the transfer tube section 12 of the instrument tube 10 , and can be manually controlled to control the opening and closing of the channel 121 .

[0063] Since the instrument tube assembly 100 is used as a component of the insertion portion 200 of the endoscope 300, in order to clearly describe the location of the inner and outer ports of the channel 121 provided on the transfer tube section 12, the insertion portion 200 is now introduced for description:

[0064] The inner port of the channel 121 of the transfer tube segment 12 is located between the proximal tube end of the first tube segment 11 and the distal tube end of the second tube segment 13. It can be positioned at the active bending segment 201 of the insertion portion 200 or at the passive bending segment 203 of the insertion portion 200, wherein the position of the inner port of the channel 121 is specifically determined according to the length of the first tube segment 11 and the second tube segment 13.

[0065] The location of the outer port of channel 121 is critical because the purpose of channel 121 is to allow the perfusion liquid flowing in the working channel of the instrument tube 10 to be discharged laterally to the outside of the insertion part 200 before reaching the distal end of the instrument tube 10. Considering that during the surgical procedure of ureteral stone treatment, the active bending section of the insertion part 200 often needs to be at least partially extended from the sheath for operation, and the passive bending section is usually not extended from the sheath for operation, if the liquid discharged through channel 121 is to be discharged directly into the annular space without entering the renal environment, the outer port of channel 121 should not be too close to the distal end of the insertion part 200. Figure 3 and Figure 4, the outer port of the channel 121 of the instrument tube 10 is positioned on the outer peripheral surface of the passive bending section of the insertion portion. The outer port of the channel 121 can be positioned on the outer peripheral surface of the middle section of the passive bending section or on the outer peripheral surface of the distal end or proximal end of the passive bending section. Generally speaking, when the outer port of the channel 121 is in the middle section or distal end of the passive bending section, it can no longer extend to the outside of the sheath. Since the intensity of the perfusion pulse will weaken as the transmission path increases, in order to obtain a sufficiently good perfusion pulse effect, it can be as follows Figure 3-Figure 5 and Figure 8 As shown, the outer end of the channel 121 is positioned on the outer peripheral surface of the distal end of the passive bending section of the insertion portion.

[0066] In this embodiment, the instrument tube assembly 100 utilizes a switch 20 to control the opening and closing of channel 121. When channel 121 is open, some of the perfusion fluid that has entered the instrument tube 10 can be preemptively discharged from channel 121 out of the working channel and out of the insertion portion 200 before reaching the distal end of the first tube segment 11. Because the outer end of channel 121 is located on the outer circumference of the passively curved section of the insertion portion 200, fluid discharged from the outer end of channel 121 can essentially enter the annular space between the sheath and the insertion portion 200, allowing the perfusion fluid to preemptively establish a partial fluid circulation through channel 121. Therefore, controlling the opening and closing of channel 121 only affects the perfusion flow rate proximal to the inner end of channel 121, which ultimately flows into the kidney, and the amount aspirated from the kidney into the annular space distal to the outer end of channel 121. It has little impact on the perfusion flow rate distal to the inner end of channel 121 and the aspiration flow proximal to the outer end. In this way, the opening and closing degree of channel 121 can be controlled by controlling switch member 20. This allows for synchronous, non-delayed, and matching regulation of the perfusion flow rate entering the kidney and the suction flow rate exiting the kidney without adjusting the power of the perfusion and suction pumps, effectively stabilizing intrarenal pressure. By continuously adjusting the opening and closing degree of channel 121, perfusion pulses can be generated at the distal end of the first tube segment 11, while maintaining stable intrarenal pressure.

[0067] According to some optional embodiments, Figure 5 As shown, the length of the second tube segment 13 is such that its distal tube opening is positioned at the distal end of the passive bending section 203 of the insertion portion 200. In this way, the inner port of the channel 121 of the transfer tube segment 12 will be located between the distal surface of the insertion portion 200 and the distal end of the passive bending section 203. This will allow the inner port of the channel 121 to be closer to the distal tube opening of the instrument tube 10, so that the perfusion pulse is generated closer to the distal tube opening of the instrument tube 10, thereby ensuring the stone-clearing effect of the perfusion pulse.

[0068] In some of the embodiments, Figure 7As shown, the outer port of the channel 121 is simultaneously positioned on the outer peripheral surface of the distal end of the passive bending section 203 of the insertion portion 200, which will make the path of the channel 121 as short as possible and the inner port of the channel 121 closer to the distal end of the instrument tube 10.

[0069] In order to further shorten the path of channel 121, as Figure 5 and Figure 7 As shown, the proximal tube opening of the first tube segment 11 can be positioned at the proximal end of the active curved segment 201 of the insertion portion 200. This ensures that the stone-clearing effect of the perfusion pulse is achieved while ensuring that the channel 121 has a shorter path, so that fluid circulation can be quickly established through the channel 121, thereby reducing the degree of fluctuation in intrarenal pressure.

[0070] According to some optional embodiments, Figure 6 As shown, the opening size of the channel 121 of the transfer tube section 12 of the instrument tube 10 gradually increases from its inner end to its outer end.

[0071] According to some optional embodiments, Figure 5-Figure 7 and Figure 10 As shown, the inner port of the channel 121 of the transfer tube section 12 of the instrument tube 10 is configured as a flat mouth. The inner port is larger in the circumferential direction of the transfer tube section 12 than in the axial direction. This results in the inner port of the channel 121 having a smaller span in the axial direction of the instrument tube 10. This minimizes collisions between instruments and the inner port of the channel 121 during passage, ensuring smooth instrument movement. Exemplarily, the inner port of the channel 121 of the transfer tube section 12 is elliptical, but may also be rectangular or oblong.

[0072] According to some optional embodiments, Figure 6 As shown, the channel 121 provided in the transfer tube segment 12 extends from its inner port to the outer port toward the proximal end of the instrument tube 10, so that the outer port of the channel 121 is directed toward the proximal end of the second tube segment 13. In this way, the channel 121 can guide the fluid to flow toward the proximal end, so as not to hinder the fluid flowing from the kidney into the annular space, and can merge with the fluid flowing from the kidney into the annular space more smoothly, thereby reducing the obstruction to the fluid.

[0073] According to some optional embodiments, Figure 7 and Figure 10As shown, the adapter tube segment 12 includes a tube body and a first socket 122 disposed at the distal end of the tube body. The proximal end of the first tube segment 11 is axially inserted into the first socket 122 and received therein, and the proximal end surface of the first tube segment 11 axially abuts the proximal end of the first socket 122 and the distal end of the tube body, forming a stepped axial positioning. A second socket 124 is disposed at the proximal end of the tube body of the adapter tube segment 12, coaxially disposed with the first socket 122. The distal end of the second tube segment 13 is axially inserted into the second socket 124 and received therein, and the distal end surface of the second tube segment 13 axially abuts the distal end of the second socket 124 and the proximal end of the tube body, forming a stepped axial positioning. The adapter tube segment 12 is plugged and fixed to the first and second tube segments 11, 13 via the provided socket. The socket can provide a certain radial constraint on the first and second tube segments 11, 13, ensuring the coaxiality of the first, adapter tube segment 11, 12, and second tube segments 13.

[0074] In some embodiments, in order to prevent the first pipe section 11 and the second pipe section 13 from falling out of the corresponding first sockets 122 and second sockets 124, a convex ring is provided in the first socket 122 and second socket 124 of the transfer pipe section 12, and a step structure is provided on the first pipe section 11 and the second pipe section 13. Figure 6 、 Figure 7 and Figure 10 As shown, the inner circumferential wall of the first socket 122 at the distal end of the transfer tube segment 12 is provided with a first convex ring 123 extending along its circumferential direction. At the same time, the first tube segment 11 is provided with a first thickened section 111 at its proximal end. The first thickened section 111 has a thickened portion that increases radially outward compared to the tube wall at other parts of the first tube segment 11. When the proximal end of the first tube segment 11 is inserted into the first socket 122, the outer circumferential wall of the first thickened section 111 contacts the inner circumferential wall of the first socket 122 along the circumferential direction, the proximal end face of the first tube segment 11 axially abuts against the step located at the proximal end of the first socket 122, and the proximal end of the first convex ring 123 axially abuts against the distal end of the first thickened section 111 to prevent the first tube segment 11 from withdrawing from the first socket 122. The proximal end face of the first thickened section 111 can be like Figure 6 and Figure 7 As shown in FIG, it is flush with the proximal end surface of the first pipe section 11 , and may also be located on the distal side of the proximal end surface of the first pipe section 11 .

[0075] The first thickened section 111 provided at the proximal end of the first tube section 11 can cooperate with the first convex ring 123 to form a snap-fit ​​structure to prevent separation, and at the same time can improve the anti-collapse ability of the proximal end of the first tube section 11 to avoid collapse after being inserted into the first socket 122.

[0076] The inner circumferential wall of the second socket 124 provided at the proximal end of the transfer tube segment 12 is provided with a second convex ring 125, and the second convex ring 125 extends circumferentially along the inner circumferential wall of the second socket 124. At the same time, the second tube segment 13 is provided with a second thickened section 131 at its distal end, and the second thickened section 131 has a thickened portion that increases radially outward compared to the tube wall of other parts of the second tube segment 13. When the distal end of the second tube segment 13 is axially inserted into the second socket 124, the outer circumferential wall of the second thickened section 131 is in circumferential contact with the inner circumferential wall of the second socket 124, the distal end face of the second tube segment 13 is axially abutted against the step located at the distal end of the second socket 124, and the distal end of the second convex ring 125 is axially abutted against the proximal end of the second thickened section 131 to prevent the second tube segment 13 from withdrawing from the second socket 124. Similarly, the distal end face of the second thickened section 131 can be like Figure 6 As shown in FIG, it is flush with the distal end surface of the second pipe section 13 , and may also be located on the proximal side of the distal end surface of the second pipe section 13 .

[0077] The second thickened section 131 provided at the distal end of the second tube section 13 can cooperate with the second convex ring 125 to form a snap-fit ​​structure to prevent separation, and at the same time can also improve the anti-collapse ability of the distal end of the second tube section 13 to avoid collapse after being inserted into the second socket 124.

[0078] In some of the embodiments, Figure 6 As shown, the first convex ring 123 provided on the inner wall of the transfer tube segment 12 is located in the middle section of the first socket 122. When the first tube segment 11 is plugged into the first socket 122, the inner ring surface of the first convex ring 123 contacts the outer peripheral wall of the first tube segment 11. The inner side of the first socket 122 forms a first glue filling groove 30 around the outer peripheral wall of the first tube segment 11 in the area between the proximal end of the first convex ring 123 and the distal end surface of the transfer tube segment 12.

[0079] The second protruding ring 125 provided on the inner wall of the adapter tube section 12 is located in the middle section of the second socket 124. When the second tube section 13 is mated with the second socket 124, the inner ring surface of the second protruding ring 125 contacts the outer peripheral wall of the second tube section 13. The inner side of the second socket 124, between the distal end of the second protruding ring 125 and the proximal end surface of the adapter tube section 12, forms a second glue-filled groove 40 around the outer peripheral wall of the second tube section 13.

[0080] In this embodiment, the user can inject glue into the first glue filling groove 30 and / or the second glue filling groove 40 according to specific circumstances to seal the fitting gap between the first pipe section 11 and the first socket 122 or between the second pipe section 13 and the second socket 124 to improve the sealing and connection stability.

[0081] According to some optional embodiments, Figure 5 and Figure 6As shown, the switch component 20 includes a valve plate 21 and an operating wire 22 and a reset component 23 connected to the valve plate 21. The operating wire 22 can be a steel wire rope or a nylon rope, etc., and the reset component 23 can be a coil spring or an elastic rubber, etc. The valve plate 21 is a flat plate or an arc-shaped plate that conforms to the curvature of the transfer tube section 12. The valve plate 21 is provided with a valve hole 211 that passes through it along its thickness direction. The valve plate 21 is inserted into the mounting groove 126 provided in the transfer tube section 12. The distal end of the operating wire 22 extends into the mounting groove 126 and connects to the proximal end of the valve plate 21. The proximal end extends along the axial direction of the instrument tube 10 toward the proximal end of the instrument tube 10. The reset component 23 is provided in the mounting groove 126, with the distal end abutting the bottom of the mounting groove 126 and the proximal end abutting the distal end of the valve plate 21. The valve plate 21 can switch between a first position and a second position relative to the channel 121 in the mounting groove 126. In the first position, the valve hole 211 and the channel 121 are as shown in FIG. Figure 6 In the second position, the valve plate 21 is displaced to close the channel 121. In the second position, the valve hole 211 is aligned with the channel 121 to open the channel 121. The valve plate 21 can be driven to move from the first position to the second position by driving the proximal end of the control wire 22 along the axial direction of the instrument tube 10, and the return member 23 can drive the valve plate 21 to return from the second position to the first position.

[0082] According to some alternative embodiments related to the switch 20, such as Figure 7 As shown, the switch member 20 comprises a frame 24 fixedly mounted within a mounting slot 126 provided in the transfer tube section 12; a coating 25 covering the frame 24; a first closing wire 26 and a second closing wire 27 affixed to and fixed to the inner side of the frame 24; and a control wire 28 connecting the second closing wire 27. The control wire 28 may be a steel cable or a nylon cable, for example. The proximal end of the control wire 28 extends axially toward the proximal end of the instrument tube 10. The coating 25 is provided with a slit aligned with the passage 121. Opposite sides of the slit are connected to the first closing wire 26 and the second closing wire 27, respectively, to close the passage 121. By controlling the proximal end of the control wire 28, the second closing wire 27 can be deformed to disengage from the first closing wire 26, thereby opening the slit and releasably releasing the passage 121. The second closing line 27 or the first closing line 26 and the second closing line 27 are flat or round wire structures with the ability to recover deformation. After the second closing line 27 recovers deformation, it can fit with the first closing line 26 to close the incision and then close the channel 121.

[0083] The second closing wire 27 may be a linear spring or a linear shape memory alloy.

[0084] According to some optional embodiments, Figure 9 and Figure 10As shown, the transfer tube section 12 of the instrument tube 10 is provided with an axially penetrating passage 1210 on the outside of the portion where it connects with the first tube section 11 and the second tube section 13. The passage 1210 is used to pass necessary cables, water and gas channels, traction ropes, etc.

[0085] On the other hand, the present invention provides an insertion portion 200, which includes an active bending segment 201 and a passive bending segment 203 that are connected in sequence from the distal end to the proximal end along the axial direction, and an instrument tube assembly 100 in any of the above embodiments arranged along the axial direction of the active bending segment 201 and the passive bending segment 203.

[0086] like Figure 3-Figure 9 As shown, the instrument tube assembly 100 is disposed inside the insertion portion 200 and extends axially from the distal end of the insertion portion 200 to the proximal end of the insertion portion 200. The outer end of the channel 121 provided in the transfer tube section 12 of the instrument tube 10 is exposed to the outer circumferential surface of the insertion portion 200.

[0087] The active bending section 201 and the passive bending section 203 of the insert 200 have a radially outermost skin 205 . The skin 205 extends axially along the insert 200 and is axially disconnected at the channel 121 to expose an outer end of the channel 121 .

[0088] According to some optional embodiments, the transfer tube segment 12 of the instrument tube 10 of the instrument tube assembly 100 is arranged at the distal end of the passive bending segment 203 of the insertion part 200, and the proximal end of the first tube segment 11 of the instrument tube 10 extends beyond the proximal end of the distal segment of the serpentine bone 202 of the active bending segment 201 of the insertion part 200 and is inserted into the first socket 122 of the transfer tube segment 12.

[0089] According to some optional embodiments, Figure 3-Figure 8 As shown, the transfer tube section 12 of the instrument tube 10 is arranged at the distal end of the passive bending section 203 of the insertion part 200 and docks with the proximal end of the active bending section 201 of the insertion part 200. Figure 7 and Figure 10 As shown, the proximal and distal ends of the transfer tube section 12 are formed with shaft shoulders 127 at the outer peripheral wall. The shaft shoulders 127 include a step surface 129 and a shaft neck 128 connected thereto.

[0090] like Figure 4 、 Figure 5 and Figure 7As shown, the proximal end of the snake bone 202 of the active bending section 201 of the insertion portion 200 and the distal end of the tubular housing 204 of the passive bending section 203 are respectively sleeved onto the shaft neck 128 of the corresponding shaft shoulder 127 and axially abut against the step surface 129 of the corresponding shaft shoulder 127. The tubular housing 204 is generally composed of a spring tube and a braided mesh tube wrapped around the spring tube. The covering 205 is wrapped around the braided mesh tube of the tubular housing 204 to isolate it from human tissue.

[0091] In another aspect, the present invention provides an endoscope 300, such as Figure 1 As shown, the endoscope 300 includes a handle 301 and an insertion portion 200 as described in any of the above embodiments. The proximal end of the insertion portion 200 is connected to the handle 301. The proximal end of the second tube section 13 of the instrument tube 10 extends into the handle 301 and connects to the instrument nozzle and negative pressure line provided on the handle 301 through a tee.

[0092] According to some optional embodiments, Figure 2 As shown, a switch control key 302 connected to the switch 20 for controlling the switch 20 to open and close the channel 121 is provided in the handle 301 , and one end of the switch control key 302 extends out of the handle 301 for manual operation. Figure 2 In the embodiment, the switch control key 302 is resettably hinged on the handle 301, and one end thereof located inside the handle 301 is connected to the proximal end of the control wire 22 in some embodiments. By pressing the switch control key 302, the proximal end of the control wire 22 can be driven to move toward the proximal end of the handle 301 to drive the channel 121 set on the instrument tube 10 to open.

[0093] The connection method of the control wire 22 and the control wire 28 in other embodiments with the switch control key 302 is similar, which can be referred to Figure 2 In some optional embodiments, a switch control key 302 is provided in the handle 301 and is connected to the switch member 20 for controlling the switch member 20 to open and close the channel 121. One end of the switch control key 302 extends outside the handle 301 for manual operation. The switch control key 302 is hinged to the handle 301 in a resettable manner. One end of the switch control key 302 located in the handle 301 is connected to the proximal end of the control wire 28 in some embodiments. By pressing the switch control key 302, the proximal end of the control wire 22 or the control wire 28 can be driven to move toward the proximal end of the handle 301 to drive the channel 121 set on the instrument tube 10 to open.

[0094] The endoscope involved in the embodiments of the present application may be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiments of the present application do not impose any specific restrictions on the type of endoscope.

[0095] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0096] Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order depending on the functions involved. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with reference to certain examples may be combined in other examples.

[0097] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. An instrument tube assembly for an insertion portion of an endoscope, the instrument tube assembly comprising an instrument tube (10), characterized in that: The instrument tube (10) comprises a first tube section (11), a transfer tube section (12) and a second tube section (13) extending axially from the distal end to the proximal end and connected in sequence, wherein the distal tube opening of the second tube section (13) is used to be positioned at the distal end of the passive bending section of the insertion portion; The wall of the transfer tube section (12) is provided with a channel (121) extending from the inner wall surface to the outer wall surface, the inner port of the channel (121) is located between the proximal end of the first tube section (11) and the distal end of the second tube section (13), and the outer port of the channel (121) is used to be positioned on the outer peripheral surface of the passive bending section of the insertion portion; A switch member (20) is correspondingly arranged at the channel (121) and is used to controllably open and close the channel (121).

2. The instrument tube assembly according to claim 1, characterized in that: The outer port of the channel (121) is used to be positioned on the outer peripheral surface of the distal end of the passive bending section of the insertion portion.

3. The instrument tube assembly according to claim 2, wherein: The channel (121) gradually expands from its inner end to its outer end; And / or, the inner port of the channel (121) is shaped like a flat mouth, wherein the dimension along the circumference of the transfer tube section (12) is larger than the dimension along the axial direction of the transfer tube section (12); And / or, the channel (121) is directed at its outer end toward the proximal end of the second tube section (13).

4. The instrument tube assembly according to claim 1, wherein: The distal end and the proximal end of the transfer tube segment (12) are respectively provided with a first socket (122) and a second socket (124) for receiving and axially positioning the proximal end of the first tube segment (11) and the distal end of the second tube segment (13).

5. The instrument tube assembly according to claim 4, characterized in that: The inner peripheral wall of the first socket (122) is provided with a first convex ring (123) extending along the circumference thereof, and the first pipe section (11) is provided with a first thickened section (111) whose wall thickness increases radially outward, and the proximal end of the first convex ring (123) is axially abutted against the distal end of the first thickened section (111) to prevent the first pipe section (11) from exiting the first socket (122); The inner peripheral wall of the second socket (124) is provided with a second convex ring (125) extending along the circumference thereof, and the second pipe section (13) is provided with a second thickened section (131) whose wall thickness increases radially outward, and the distal end of the second convex ring (125) is axially abutted against the proximal end of the second thickened section (131) to prevent the second pipe section (13) from exiting the second socket (124).

6. The instrument tube assembly according to claim 5, characterized in that: The inner annular surface of the first convex ring (123) contacts the outer peripheral wall of the first pipe section (11), and the inner side of the first socket (122) forms a first glue filling groove (30) surrounding the outer peripheral wall of the first pipe section (11) at the proximal end side of the first convex ring (123); The inner annular surface of the second protruding ring (125) contacts the outer peripheral wall of the second pipe section (13), and the inner side of the second socket (124) forms a second glue filling groove (40) surrounding the outer peripheral wall of the second pipe section (13) at the distal end side of the second protruding ring (125).

7. The instrument tube assembly according to claim 6, characterized in that: The switch member (20) includes a valve plate (21), a manipulation line (22) and a reset member (23) connected to the valve plate (21), and the valve plate (21) is provided with a valve hole (211); the valve plate (21) can be switched between a first position and a second position relative to the channel (121); in the first position, the valve hole (211) is misaligned with the channel (121) to close the channel (121); in the second position, the valve hole (211) is aligned with the channel (121) to open the channel (121); The control line (22) can drive the valve plate (21) to move from the first position to the second position, and the reset member (23) can drive the valve plate (21) to return from the second position to the first position; Alternatively, the switch element (20) comprises a frame (24), a coating (25) covering the frame (24), a first closed line (26) and a second closed line (27) adhered to each other and fixed to the inner side of the frame (24), and a control line (28) connecting the second closed line (27); the coating (25) is provided with a slit aligned with the channel (121); opposite sides of the slit are respectively connected to the first closed line (26) and the second closed line (27) to close the channel (121); the control line (28) can drive the second closed line (27) to deform so as to detach from the first closed line (26) to open the slit to open the channel (121); the second closed line (27) has the ability to recover its deformation to adhere to the first closed line (26); and / or, The transfer tube section (12) is provided with a mounting groove (126), and the switch component (20) is inserted into the mounting groove (126).

8. An insertion portion, characterized in that: The invention comprises an instrument tube assembly (100) according to any one of claims 1 to 7, wherein the instrument tube assembly (100) is arranged inside the insertion portion (200) and extends from the distal end surface of the insertion portion (200) to the proximal end side of the insertion portion (200), and the outer port of the channel (121) is exposed to the outer peripheral surface of the insertion portion (200).

9. The insertion portion according to claim 8, characterized in that: The insert (200) includes a skin (205) located at the radially outermost layer thereof, the skin (205) extending along the axial direction of the insert (200) and being axially disconnected at the channel (121) to expose an outer port of the channel (121); And / or, the transfer tube section (12) is arranged at the distal end of the passive bending section (203) of the insertion part (200), and the proximal end and the distal end of the transfer tube section (12) are formed with a shaft shoulder (127) at the outer peripheral wall, and the proximal end of the snake bone (202) of the active bending section (201) of the insertion part (200) and the distal end of the tube shell (204) of the passive bending section (203) are respectively sleeved on the shaft neck (128) of the corresponding shaft shoulder (127) and axially abut the step surface (129) of the corresponding shaft shoulder (127).

10. An endoscope (300), characterized in that: The invention comprises a handle (301) and an insertion portion (200) according to claim 8 or 9, wherein the proximal end of the insertion portion (200) is connected to the handle (301), and the handle (301) is provided with a switch control key (302), and the switch control key (302) is connected to the switch (20) for controlling the switch (20) to open and close the channel (121).

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