Instrument tube assembly, insertion part and endoscope

Abstract

The invention provides an instrument tube assembly, an insertion part and an endoscope, relates to the technical field of endoscopes, and solves the problem of poor stability of intra-renal pressure when the perfusion flow is adjusted. The instrument tube assembly is used for an insertion part of an endoscope and comprises a first tube section, an adapter tube section and a second tube section which are in butt joint in sequence, the adapter tube section is provided with a channel, an inner side port of the channel is located between a near-end tube opening of the first tube section and a far-end tube opening of the second tube section, and an outer side port of the channel is used for being located on the peripheral face of a passive bending section of the insertion part. The channel is controlled to be opened and closed through the switch piece, so that part of perfusion liquid can be discharged into the annular space in advance to establish part of fluid circulation before reaching the far-end pipe opening of the first pipe section; the perfusion flow entering the kidney and the suction flow discharged from the kidney are adjusted in a synchronous, delay-free and matched mode, so that the pressure in the kidney is effectively stabilized, and the stability of the pressure in the kidney can be better maintained when perfusion pulses are generated.

Description

Technical Field

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

[0002] Currently, in the case of treating kidney stones through the ureter using a nephroscope, during the operation, it is necessary to send a lithotripsy laser fiber through an instrument channel and use it as a perfusion channel to perfuse liquid into the kidney. It is also necessary to use a sheath tube to cooperate with the insertion portion of the nephroscope to form an annular space located outside the insertion portion and inside the sheath tube, and use this annular space as a return water channel to aspirate the liquid and the crushed stones mixed therein, so as to establish a stable fluid circulation and maintain the stability of the renal pressure. To stably maintain the renal pressure, generally, a matching perfusion flow rate and aspiration flow rate are required. However, in some cases, it is necessary to actively adjust the perfusion flow rate into the kidney. For example, in some cases, in order to obtain a clear field of view or better stone removal efficiency, the perfusion flow rate and / or the aspiration flow rate may be artificially adjusted. Due to possible adjustment delays or errors between the perfusion pump and the aspiration pump, the renal pressure may fluctuate beyond the preset value; in other cases, in order to improve the stone removal effect, a perfusion pulse is artificially created, which may lead to an intermittent mismatch between the perfusion volume into the kidney and the aspiration volume flowing out of the kidney into the annular space, resulting in a significant fluctuation of the renal pressure, and even exceeding the safe value of the renal pressure. All of the above situations may increase the complications related to high renal pressure and occult renal injury. Summary of the Invention

[0003] The object 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 renal pressure when adjusting the perfusion flow rate.

[0004] The present invention is achieved by the following technical solutions: The present application provides an instrument tube assembly for the insertion portion of an endoscope. The instrument tube assembly includes an instrument tube and a switch member. The instrument tube includes a first tube section, a transition tube section, and a second tube section that extend axially from the distal end to the proximal end and are sequentially butted. The wall of the transition tube section is provided with a channel that penetrates from the inner wall surface to the outer wall surface. The inner port of the channel is located between the proximal end opening of the first tube section and the distal end opening of the second tube section. The outer port of the channel is used to be positioned on the outer peripheral surface of the passive bending section of the insertion portion. The switch member is correspondingly arranged at the channel for controllably opening and closing the channel.

[0005] When the above - mentioned setting structure is adopted, the instrument tube assembly is provided with a channel on its adapter tube section that connects the working channel inside the instrument tube to the outside. It is possible to utilize the opening time of the channel to allow some of the perfusion liquid that has already entered the instrument tube to be discharged from the working channel in advance before reaching the distal nozzle of the first tube section. Further, since the outer port of the channel will be arranged on the outer peripheral surface of the passive bending section of the insertion part, the liquid discharged from the outer port of the channel can directly enter the annular space between the sheath tube and the insertion part, enabling the perfusion liquid to establish partial fluid circulation through the channel in advance. Therefore, by controlling the opening and closing of the channel, it will only affect the perfusion flow rate that will ultimately flow into the kidney on the proximal side of the inner port of the channel, and the suction volume that enters the annular space from the kidney on the distal side of the outer port of the channel. There is basically no impact on the perfusion flow rate on the distal side of the inner port of the channel and the suction flow rate on the proximal side of the outer port. In this way, the opening and closing degree of the channel can be controlled by controlling the switching element, so as to synchronously and without delay adjust the perfusion flow rate entering the kidney and the suction flow rate discharged from the kidney in a matching manner without adjusting the power of the perfusion pump and the suction pump, so as to effectively stabilize the renal pressure. It is also possible to continuously adjust the opening and closing degree of the channel to better maintain the stability of the renal pressure while generating a perfusion pulse at the distal nozzle of the first tube section.

[0006] Further, to better implement the present invention, the following setting structure is specifically adopted: the distal nozzle of the second tube section is used to be positioned at the distal end of the passive bending section of the insertion part.

[0007] When the above - mentioned setting structure is adopted, the distal nozzle of the second tube section will be arranged at the distal end of the passive bending section of the insertion part. This can make the inner port of the channel closer to the distal nozzle of the instrument tube while keeping the path of the channel as short as possible, so that the perfusion pulse can be generated closer to the distal nozzle of the instrument tube to ensure the stone - clearing effect of the perfusion pulse.

[0008] Further, to better implement the present invention, the following setting structure is specifically adopted: the outer port of the channel is used to be positioned on the outer peripheral surface at the distal end of the passive bending section of the insertion part.

[0009] When the above - mentioned setting structure is adopted, the outer port of the channel is further used to be positioned at the distal end of the passive bending section of the insertion part. This can ensure that the channel has a short path while guaranteeing the stone - clearing effect of the perfusion pulse, so as to quickly establish fluid circulation through the channel and reduce the degree of renal pressure fluctuation.

[0010] Further, to better implement the present invention, the following setting structure is specifically adopted: the channel gradually expands from its inner port to its outer port.

[0011] Furthermore, to better implement the present invention, the following structural settings are particularly adopted: The inner port shape of the channel is a flat opening shape whose dimension along the circumferential direction of the adapter pipe section is larger than the dimension along the axial direction of the adapter pipe section.

[0012] When the above structural settings are adopted, when the inner port of the channel is set to a flat opening shape, the axial span can be reduced, and the situation where the instrument collides with the inner port of the channel when passing through can be avoided as much as possible, ensuring the smooth movement of the instrument.

[0013] Furthermore, to better implement the present invention, the following structural settings are particularly adopted: The direction of the channel at its outer port deflects towards the proximal end of the second pipe section.

[0014] When the above structural settings are adopted, the channel can guide the liquid to flow towards the proximal end, so as to reduce the obstructive effect on the fluid entering the annular space from the kidney.

[0015] Furthermore, to better implement the present invention, the following structural settings are particularly adopted: The distal end and the proximal end of the adapter pipe section are respectively provided with a first socket and a second socket for receiving and axially positioning the proximal end of the first pipe section and the distal end of the second pipe section.

[0016] Furthermore, to better implement the present invention, the following structural settings are particularly adopted: The inner peripheral wall of the first socket is provided with a first convex ring extending along its circumferential direction, the first pipe section is provided with a first thickened section with the wall thickness increasing radially outwards, and the proximal end of the first convex ring axially abuts against the distal end of the first thickened section for preventing the first pipe section from withdrawing from the first socket; The inner peripheral wall of the second socket is provided with a second convex ring extending along its circumferential direction, the second pipe section is provided with a second thickened section with the wall thickness increasing radially outwards, and the distal end of the second convex ring axially abuts against the proximal end of the second thickened section for preventing the second pipe section from withdrawing from the second socket.

[0017] When the above structural settings are adopted, the first thickened section provided at the proximal end of the first pipe section can improve the anti-collapse ability of the end, avoid collapse after being inserted into the first socket, and at the same time can cooperate with the first convex ring to form a clamping structure to avoid detachment. The second thickened section provided at the distal end of the second pipe section can improve the anti-collapse ability of its end, avoid collapse after being inserted into the second socket, and at the same time can cooperate with the second convex ring to form a clamping structure to avoid detachment.

[0018] Furthermore, to better implement the present invention, the following structural settings are particularly adopted: The inner ring surface of the first convex ring contacts the outer peripheral wall of the first pipe section, and a first glue filling groove surrounding the outer peripheral wall of the first pipe section is formed on the proximal side of the first convex ring inside the first socket; The inner ring surface of the second convex ring contacts the outer peripheral wall of the second pipe section, and a second glue filling groove surrounding the outer peripheral wall of the second pipe section is formed on the distal side of the second convex ring inside the second socket.

[0019] When the above-mentioned setting structure is adopted, glue can be added into the first glue filling groove to seal the fitting gap between the first pipe section and the first socket, so as to improve the sealing performance. Glue can be added into the second glue filling groove to seal the fitting gap between the second pipe section and the second socket, so as to improve the sealing performance.

[0020] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: The switch member includes a valve plate, a control wire connected to the valve plate, and a reset member. The valve plate is provided with a valve hole; the valve plate can be switched between a first position and a second position relative to the channel. In the case of the first position, the valve hole is misaligned with the channel to close the channel. In the case of 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 member can drive the valve plate to return from the second position to the first position; Or, the switch member includes a frame, a film covering the frame, a first closing wire and a second closing wire that are mutually attached and fixed to the inner side of the frame, and a control wire connecting the second closing wire. The film is provided with a slit aligned with the channel. The opposite sides of the slit are respectively connected to the first closing wire and the second closing wire to close the channel. The control wire can drive the second closing wire to deform to disengage from the first closing wire to open the slit to open the channel. The second closing wire has the ability to recover deformation to fit with the first closing wire.

[0021] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: The adapter pipe section is provided with an installation groove, and the switch member is inserted into the installation groove.

[0022] The present application also provides an insertion part, which includes the above-mentioned instrument tube assembly. The instrument tube assembly is arranged inside the insertion part and extends from the distal end surface of the insertion part to the proximal side of the insertion part. The outer port of the channel is exposed on the outer peripheral surface of the insertion part.

[0023] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: The insertion part includes a skin located on its outermost layer in the radial direction. The skin extends along the axial direction of the insertion part and is axially disconnected at the channel to expose the outer port of the channel.

[0024] Furthermore, to better implement the present invention, the following setting structure is particularly adopted: The adapter pipe section is arranged at the distal end of the passive bending section of the insertion part. The proximal end and the distal end of the adapter pipe section form 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 pipe shell of the passive bending section are respectively sleeved on the journal of the corresponding shoulder and axially abut against the step surface of the corresponding shoulder.

[0025] This 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 to control the switch to open and close the channel.

[0026] The present invention has the following advantages and beneficial effects: In the present invention, the instrument tube assembly is provided with a channel on its adapter pipe section that connects the working channel inside the instrument tube to the outside. The opening time of the channel can be utilized to allow part of the perfusion liquid that has entered the instrument tube to be discharged from the working channel in advance before reaching the distal end opening of the first tube section. Further, since the outer port of the channel will be arranged on the outer peripheral surface of the passive bending section of the insertion part, the liquid discharged from the outer port of the channel can directly enter the annular space between the sheath tube and the insertion part, enabling the perfusion liquid to establish partial fluid circulation through the channel in advance. Therefore, by controlling the opening and closing of the channel, only the perfusion flow rate that will eventually flow into the kidney on the proximal side of the inner port of the channel and the suction volume that enters the annular space from the kidney on the distal side of the outer port of the channel will be affected. There is basically no impact on the perfusion flow rate on the distal side of the inner port of the channel and the suction flow rate on the proximal side of the outer port. In this way, the opening and closing degree of the channel can be controlled by controlling the switch, so as to synchronously and without delay and matchingly adjust the perfusion flow rate entering the kidney and the suction flow rate discharged from the kidney without adjusting the power of the perfusion pump and the suction pump, so as to effectively stabilize the renal pressure. It is also possible to continuously adjust the opening and closing degree of the channel to better maintain the stability of the renal pressure while generating a perfusion pulse at the distal end opening of the first tube section. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 It is a schematic diagram of the external structure of the endoscope; Figure 2Shows the installation structure of the switch control key and the handle; Figure 3 Is a schematic structural diagram of the insertion part; Figure 4 On Figure 3 Removed the skin; Figure 5 Shows a cross-sectional structure of the insertion part in a partial area including the adapter tube section; Figure 6 Is a cross-sectional view structure diagram of the instrument tube assembly; Figure 7 Shows another cross-sectional structure of the insertion part in a partial area including the adapter tube section (the second tube section is hidden in the figure); Figure 8 Is a partial side view of the insertion part; Figure 9 Is Figure 8 The A-A cross-sectional view in Figure 10 Is a schematic structural diagram of the adapter tube section from the proximal side view.

[0029] The markings in the figure are: 100, instrument tube assembly; 10, instrument tube; 11, first tube section; 111, first thickened section; 12, adapter tube section; 121, channel; 122, first socket; 123, first convex ring; 124, second socket; 125, second convex ring; 126, installation groove; 127, shoulder; 128, journal; 129, step surface; 1210, through channel; 13, second tube section; 131, second thickened section; 20, switch; 21, valve plate; 211, valve hole; 22, operating wire; 23, reset part; 24, frame; 25, film; 26, first closing wire; 27, second closing wire; 28, control wire; 30, first caulking groove; 40, second caulking groove; 200, insertion part; 201, active bending section; 202, snake bone; 203, passive bending section; 204, tube shell; 205, skin; 300, endoscope; 301, handle; 302, switch control key. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope protected by the present invention.

[0031] In the description of the present application, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0032] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In each embodiment of the present application, "proximal end" and "distal end" refer to the relative distances of each component from the user in the usage environment. Among them, the end closer to the user is defined as the "proximal end", and the end farther from the user is defined as the "distal end".

[0034] The instrument tube assembly 100, insertion portion 200, and endoscope 300 of the present invention are provided with a channel 121 on the instrument tube 10 at the position of the insertion portion, which laterally communicates the working channel with the external environment of the insertion portion. When the endoscope 300 cooperates with the sheath tube for a surgery that requires the establishment of a liquid circulation, such as a lithotripsy for treating kidney stones through the ureter, by controlling the opening and closing of the channel 121, the perfusion flow rate finally entering the kidney can be adjusted without adjusting the total perfusion flow rate received by the working channel. Synchronously, the suction flow rate entering the annular space inside the sheath tube and outside the insertion portion 200 from the kidney can be adjusted, without affecting the total suction flow rate discharged from the annular space. This can make the renal pressure more stable when the perfusion flow rate entering the kidney needs to be adjusted, especially when generating a perfusion pulse at the distal side of the insertion portion 200 by adjusting the perfusion flow rate to wash the crushed stones, because the perfusion pulse requires a high adjustment frequency and the operation is generally relatively frequent, and it is too late to react by adaptively adjusting the suction flow rate through the endoscope handle or the main unit and other means.

[0035] The following combines the attached Figures 1 to 10 , and through specific embodiments and their application scenarios, an instrument tube assembly 100, insertion portion 200, and endoscope 300 provided by the present application are described in detail.

[0036] On the one hand, the present invention provides an instrument tube assembly 100 for the insertion portion of an endoscope. As Figure 6 shown, the instrument tube assembly 100 includes an instrument tube 10 provided with a channel 121 and a switch member 20 for controlling the opening and closing of the channel 121. Among them, the switch member 20 can control the opening and closing degree of the channel 121 with only two gears of 0 and 100%, such as a switch member 20 using a solenoid valve, a piezoelectric sheet attached to one port of the channel 121, etc. The switch member 20 can also additionally have gears between the above two gears for controlling the opening and closing degree of the channel 121, such as a 50% gear, or also a 30% or 70% gear. Of course, in addition to the above fixed gears, the opening and closing degree of the channel 121 can also be adjusted steplessly.

[0037] Figure 5 and Figure 7 In, the instrument tube 10 includes a first tube section 11, a transition tube section 12, and a second tube section 13 that extend axially from the distal end to the proximal end. The first tube section 11, the transition tube section 12, and the second tube section 13 are sequentially butted along the axial direction of the instrument tube 10 from the distal end to the proximal end. A working channel is provided inside the instrument tube 10, which penetrates from the distal end port of the first tube section 11 to the proximal end port of the second tube section 13. The working channel is used for the passage of instruments including a holmium laser fiber and for receiving and guiding the perfusion liquid to flow distally.

[0038] As Figure 10 and Figure 6As shown in the figure, a through-channel 121 is provided on the tube wall of the adapter tube section 12. The channel 121 penetrates from the inner side port formed on the inner wall surface of the adapter tube section 12 to the outer side port formed on the outer wall surface, laterally connecting the working channel inside the instrument tube 10 with the outside of the adapter tube section 12.

[0039] The switch member 20 is correspondingly arranged at the channel 121 of the adapter tube section 12 of the instrument tube 10, and it can be controlled to open and close the channel 121 through manual control.

[0040] Since the instrument tube assembly 100 is used as a component of the insertion part 200 of the endoscope 300 during use, in order to clearly describe the setting positions of the inner side port and the outer side port of the channel 121 provided on the adapter tube section 12, the insertion part 200 is introduced as follows: The inner side port of the channel 121 of the adapter tube section 12 is located between the proximal pipe orifice of the first pipe section 11 and the distal pipe orifice of the second pipe section 13, and can be positioned at the active bending section 201 of the insertion part 200 or at the passive bending section 203 of the insertion part 200. The position of the inner side port of the channel 121 is specifically determined according to the lengths of the first pipe section 11 and the second pipe section 13.

[0041] The setting position of the outer side port of the channel 121 is relatively crucial because the purpose of the 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 pipe orifice of the instrument tube 10. Considering that during the operation of treating ureteral stones, in many cases, the active bending section of the insertion part 200 needs to at least partially extend out of the sheath for operation, and the passive bending section is mostly not extended out of the sheath for operation. If the liquid discharged through the channel 121 is not to enter the renal internal environment but directly discharged into the annular space, then the outer side port of the channel 121 cannot be too close to the distal end of the insertion part 200. Refer to Figure 3 and Figure 4 , the outer side 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 part. The outer side 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 the proximal end of the passive bending section. Generally speaking, when the outer side port of the channel 121 is at the middle section and the distal end of the passive bending section, it cannot extend out of the sheath anymore. 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 shown in Figures 3 to 5 and Figure 8 such that the outer side port of the channel 121 is positioned on the outer peripheral surface of the distal end of the passive bending section of the insertion part.

[0042] In this embodiment, the instrument tube assembly 100 can control the opening and closing of the channel 121 by using the switch member 20. When the channel 121 is open, part of the perfusion liquid that has entered the instrument tube 10 can be discharged from the channel 121 in advance to the outside of the insertion portion 200 through the working channel before reaching the distal nozzle of the first tube section 11. Since the outer port of the channel 121 is provided on the outer peripheral surface of the passive bending section of the insertion portion 200, it can be basically ensured that the liquid discharged from the outer port of the channel 121 can directly enter the annular space between the sheath tube and the insertion portion 200, so that the perfusion liquid can establish a partial fluid circulation in advance through the channel 121. Therefore, by controlling the opening and closing of the channel 121, it will only affect the perfusion flow rate that will finally flow into the kidney on the proximal side of the inner port of the channel 121, and the suction volume that enters the annular space from the kidney on the distal side of the outer port of the channel 121. It will basically have no effect on the perfusion flow rate on the distal side of the inner port of the channel 121 and the suction flow rate on the proximal side of the outer port. In this way, the opening and closing degree of the channel 121 can be controlled by controlling the switch member 20, so as to synchronously and without delay and match the regulation of the perfusion flow rate entering the kidney and the suction flow rate discharged from the kidney without adjusting the power of the perfusion pump and the suction pump, so as to effectively stabilize the renal pressure. It is also possible to continuously adjust the opening and closing degree of the channel 121 to better maintain the stability of the renal pressure while generating a perfusion pulse at the distal nozzle of the first tube section 11.

[0043] According to some alternative embodiments, as Figure 5 shown, the length of the second tube section 13 is such that its distal nozzle 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 adapter tube section 12 will be between the distal end face of the insertion portion 200 and the distal end of the passive bending section 203, which will make the inner port of the channel 121 closer to the distal nozzle of the instrument tube 10, so that the perfusion pulse is generated closer to the distal nozzle of the instrument tube 10 to ensure the stone-clearing effect of the perfusion pulse.

[0044] In some of these embodiments, as Figure 7 shown, the outer port of the channel 121 is simultaneously positioned on the outer peripheral surface at the distal end of the passive bending section 203 of the insertion portion 200, which will make the inner port of the channel 121 closer to the distal nozzle of the instrument tube 10 while making the path of the channel 121 as short as possible.

[0045] To further shorten the path of the channel 121, as Figure 5 and Figure 7 shown, the proximal nozzle of the first tube section 11 can be positioned at the proximal end of the active bending section 201 of the insertion portion 200, so that while ensuring the stone-clearing effect of the perfusion pulse, it can ensure that the channel 121 has a short path, so as to quickly establish a fluid circulation through the channel 121 and reduce the degree of renal pressure fluctuation.

[0046] 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.

[0047] According to some optional embodiments, Figures 5 to 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.

[0048] 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.

[0049] According to some optional embodiments, Figure 7 and Figure 10 As 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.

[0050] In some of these embodiments, in order to prevent the first pipe segment 11 and the second pipe segment 13 from disengaging from the corresponding first socket 122 and second socket 124, a convex ring is provided in the first socket 122 and the second socket 124 of the adapter pipe segment 12, and a stepped structure is provided on the first pipe segment 11 and the second pipe segment 13. Specifically, as Figure 6 , Figure 7 and Figure 10 show, the inner peripheral wall of the first socket 122 at the distal end of the adapter pipe segment 12 is provided with a first convex ring 123 extending along its circumferential direction. At the same time, the first pipe segment 11 is provided with a first thickened section 111 at its distal end portion. The first thickened section 111 has a thickened portion that increases radially outward compared to the pipe wall of other portions of the first pipe segment 11. When the distal end of the first pipe segment 11 is inserted into the first socket 122, the outer peripheral wall of the first thickened section 111 contacts the inner peripheral wall of the first socket 122 along the circumferential direction. The proximal end face of the first pipe 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 pipe segment 11 from withdrawing from the first socket 122. The proximal end face of the first thickened section 111 can be flush with the proximal end face of the first pipe segment 11 as shown in Figure 6 and Figure 7 , or can be located on the distal side of the proximal end face of the first pipe segment 11.

[0051] The first thickened section 111 provided at the proximal end of the first pipe segment 11 can cooperate with the first convex ring 123 to form a snap-fit structure to prevent disengagement, and at the same time can also improve the anti-collapse ability of the proximal end portion of the first pipe segment 11 to avoid collapse after being inserted into the first socket 122.

[0052] The inner peripheral wall of the second socket 124 provided at the proximal end of the adapter pipe segment 12 is provided with a second convex ring 125. The second convex ring 125 extends along the circumferential direction of the inner peripheral wall of the second socket 124. At the same time, the second pipe segment 13 is provided with a second thickened section 131 at its top portion. The second thickened section 131 has a thickened portion that increases radially outward compared to the pipe wall of other portions of the second pipe segment 13. When the proximal end of the second pipe segment 13 is axially inserted into the second socket 124, the outer peripheral wall of the second thickened section 131 contacts the inner peripheral wall of the second socket 124 along the circumferential direction. The distal end face of the second pipe segment 13 axially abuts against the step located at the distal end of the second socket 124, and the distal end of the second convex ring 125 axially abuts against the proximal end of the second thickened section 131 to prevent the second pipe segment 13 from withdrawing from the second socket 124. Similarly, the distal end face of the second thickened section 131 can be flush with the distal end face of the second pipe segment 13 as shown in Figure 6 , or can be located on the proximal side of the distal end face of the second pipe segment 13.

[0053] The second thickened section 131 provided at the distal end of the second pipe section 13 can cooperate with the second convex ring 125 to form a clamping structure to prevent disengagement. At the same time, it can also improve the anti-collapse ability of the distal end of the second pipe section 13 and prevent collapse after being inserted into the second socket 124.

[0054] In some of these embodiments, such as Figure 6 As shown, the first convex ring 123 provided on the inner wall of the adapter pipe section 12 is located in the middle section of the first socket 122. When the first pipe section 11 is inserted and mated with the first socket 122, the inner ring surface of the first convex ring 123 contacts the outer peripheral wall of the first pipe section 11. A first caulking groove 30 surrounding the outer peripheral wall of the first pipe section 11 is formed in the area between the proximal end of the first convex ring 123 and the distal end surface of the adapter pipe section 12 on the inner side of the first socket 122.

[0055] The second convex ring 125 provided on the inner wall of the adapter pipe section 12 is located in the middle section of the second socket 124. When the second pipe section 13 is inserted and mated with the second socket 124, the inner ring surface of the second convex ring 125 contacts the outer peripheral wall of the second pipe section 13. A second caulking groove 40 surrounding the outer peripheral wall of the second pipe section 13 is formed in the area between the distal end of the second convex ring 125 and the proximal end surface of the adapter pipe section 12 on the inner side of the second socket 124.

[0056] In this embodiment, the user can inject glue into the first caulking groove 30 and / or the second caulking groove 40 according to specific circumstances to seal the mating gap between the first pipe section 11 and the first socket 122 or between the second pipe section 13 and the second socket 124, so as to improve the sealing performance and connection stability.

[0057] According to some alternative embodiments, such as Figure 5 and Figure 6 As shown, the switch member 20 includes a valve plate 21, a control wire 22 connected to the valve plate 21, and a reset member 23. The control wire 22 can be a steel wire rope or a nylon rope, etc. The reset member 23 can be a helical spring or an elastic rubber, etc. The valve plate 21 is a flat plate or an arc-shaped plate conforming to the curvature of the adapter pipe section 12. The valve plate 21 is provided with a valve hole 211 penetrating along its thickness direction. The valve plate 21 is inserted into the installation groove 126 provided in the adapter pipe section 12. The distal end of the control wire 22 extends into the installation groove 126 and is connected to the proximal end of the valve plate 21. The proximal end extends along the axial direction of the instrument tube 10 towards the proximal end of the instrument tube 10. The reset member 23 is arranged in the installation groove 126, with the distal end abutting against the bottom of the installation groove 126 and the proximal end abutting against 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 installation groove 126. In the case of the first position, the valve hole 211 and the channel 121 are as Figure 6Displaced in that way to close the channel 121. In the case of the second position, the valve hole 211 is aligned with the channel 121 to open the channel 121. By driving the proximal end of the operating wire 22 to move axially along the instrument tube 10, the valve plate 21 can be driven 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.

[0058] According to some alternative embodiments related to the switching member 20, such as Figure 7 As shown, the switching member 20 includes a frame 24 fixedly installed in the installation groove 126 provided in the adapter pipe section 12, a film 25 covering the frame 24, a first closing wire 26 and a second closing wire 27 that are attached 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 can be a steel wire rope or a nylon rope, etc. The proximal end of the control wire 28 extends axially along the instrument tube 10 towards the proximal end of the instrument tube 10. The film 25 is provided with a slit aligned with the channel 121. The opposite sides of the slit are respectively connected to the first closing wire 26 and the second closing wire 27 to close the channel 121. By controlling the proximal end of the control wire 28, the second closing wire 27 can be driven to deform to disengage from the first closing wire 26 to open the slit and open the channel 121. Among them, the second closing wire 27 or both the first closing wire 26 and the second closing wire 27 are flat wire or round wire structures with the ability to recover deformation. After the second closing wire 27 recovers deformation, it can fit with the first closing wire 26 to close the slit and thus close the channel 121.

[0059] The second closing wire 27 can be a linear spring or a linear shape memory alloy.

[0060] According to some alternative embodiments, such as Figure 9 and Figure 10 As shown, on the outer side of the part where the adapter pipe section 12 of the instrument tube 10 is docked with the first pipe section 11 and the second pipe section 13, there is an axially penetrating through-channel 1210 for threading necessary cables, water and gas channels, traction ropes, etc.

[0061] On the other hand, the present invention provides an insertion part 200, which includes an active bending section 201 and a passive bending section 203 that are axially butted in sequence from the distal end to the proximal end, and an instrument tube assembly 100 in any of the above embodiments arranged axially along the active bending section 201 and the passive bending section 203.

[0062] As Figures 3 to 9 shown, the instrument tube assembly 100 is arranged inside the insertion part 200 and extends axially along the insertion part 200 from the distal end surface of the insertion part 200 to the proximal side of the insertion part 200. The outer port of the channel 121 provided in the adapter pipe section 12 of the instrument tube 10 is exposed on the outer peripheral surface of the insertion part 200.

[0063] The active bending section 201 and the passive bending section 203 of the insertion portion 200 have a skin 205 located at the outermost layer in the radial direction thereof. The skin 205 extends axially along the insertion portion 200 and is axially disconnected at the channel 121 to expose the outer port of the channel 121.

[0064] According to some alternative embodiments, the adapter tube section 12 of the instrument tube 10 of the instrument tube assembly 100 is disposed at the distal end of the passive bending section 203 of the insertion portion 200, and the proximal end of the first tube section 11 of the instrument tube 10 extends beyond the proximal end of the last joint of the snake bone 202 of the active bending section 201 of the insertion portion 200 and is inserted into the first socket 122 of the adapter tube section 12.

[0065] According to some alternative embodiments, as Figures 3 to 8 shown, the adapter tube section 12 of the instrument tube 10 is disposed at the distal end of the passive bending section 203 of the insertion portion 200 and is docked with the proximal end of the active bending section 201 of the insertion portion 200. As Figure 7 and Figure 10 shown, shoulders 127 are formed at the proximal and distal ends of the adapter tube section 12 on the outer peripheral wall. The shoulders 127 include a stepped surface 129 and a journal 128 connected thereto.

[0066] As Figure 4 、 Figure 5 and Figure 7 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 tube shell 204 of the passive bending section 203 are respectively sleeved on the journals 128 of the corresponding shoulders 127 and are axially abutted against the stepped surfaces 129 of the corresponding shoulders 127. Among them, the tube shell 204 is generally composed of a spring tube and a braided tube wrapped outside the spring tube, and the skin 205 wraps the braided tube of the tube shell 204 to separate it from human tissues.

[0067] On the other hand, the present invention provides an endoscope 300, as Figure 1 shown, the endoscope 300 includes a handle 301 and the insertion portion 200 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 is docked with an instrument nozzle and a negative pressure pipeline provided on the handle 301 through a tee.

[0068] According to some alternative embodiments, as Figure 2 shown, a switch control key 302 for controlling the opening and closing of the channel 121 by connecting with the switch member 20 is disposed in the handle 301, and one end of the switch control key 302 extends out of the handle 301 for being manipulated by a human hand. Figure 2In this case, the switch control key 302 is pivotally connected to the handle 301 in a resetable manner. One end of the switch control key 302 that is located inside the handle 301 is connected to the proximal end of the operating wire 22 in some embodiments. By pressing down the switch control key 302, the proximal end of the operating wire 22 can be driven to move towards the proximal end of the handle 301 to drive the opening of the channel 121 provided on the instrument tube 10.

[0069] The connection manner of the operating wire 22 and the control wire 28 in some other embodiments to the switch control key 302 is similar, and reference can be made to Figure 2 In some alternative embodiments, a switch control key 302 is provided inside the handle 301 and is connected to the switch member 20 for controlling the opening and closing of the channel 121 by the switch member 20. One end of the switch control key 302 extends outside the handle 301 for being manipulated by a human hand. The switch control key 302 is pivotally connected to the handle 301 in a resetable manner. One end of the switch control key 302 that is located inside the handle 301 is connected to the proximal end of the control wire 28 in some embodiments. By pressing down the switch control key 302, the proximal end of the operating wire 22 or the control wire 28 can be driven to move towards the proximal end of the handle 301 to drive the opening of the channel 121 provided on the instrument tube 10.

[0070] The endoscope involved in the embodiments of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a nasal endoscope, an oral endoscope, a laryngoscope, a vaginoscope, a laparoscope, an arthroscope, etc. The embodiments of the present application do not specifically limit the types of endoscopes.

[0071] It should be noted that in this article, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0072] In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed. It may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods can be performed in an order different from that described, and various steps can also be added, omitted, or combined. Additionally, the features described with reference to certain examples can be combined in other examples.

[0073] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. An instrument tube assembly for an insertion portion of an endoscope, characterized in that: The instrument tube assembly includes an instrument tube (10), and the instrument tube (10) includes a first tube section (11), a transition tube section (12), and a second tube section (13) that extend axially from the distal end to the proximal end and are butt-jointed in sequence; The tube wall of the transition tube section (12) is provided with a channel (121) that penetrates from the inner wall surface to the outer wall surface. The inner port of the channel (121) is located between the proximal end opening of the first tube section (11) and the distal end opening 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 part; A switch member (20) is correspondingly arranged at the channel (121) for controllably opening and closing the channel (121).

2. The instrument tube assembly according to claim 1, wherein: The distal end opening of the second tube section (13) is used to be positioned at the distal end of the passive bending section of the insertion part; And / or, 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 part.

3. The instrument tube assembly according to claim 2, characterized in that: The channel (121) gradually expands from its inner port to its outer port; And / or, the shape of the inner port of the channel (121) is a flat-mouth shape with a dimension along the circumferential direction of the transition tube section (12) being larger than the dimension along the axial direction of the transition tube section (12); And / or, the direction of the channel (121) at its outer port biases towards the proximal end of the second tube section (13).

4. An instrument tube assembly according to claim 1, wherein: The distal end and the proximal end of the transition tube section (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 section (11) and the distal end of the second tube section (13).

5. An 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 its circumferential direction. The first tube section (11) is provided with a first thickened section (11) with a radially outward increasing wall thickness. The proximal end of the first convex ring (123) axially abuts against the distal end of the first thickened section (11) to prevent the first tube section (11) from withdrawing from the first socket (122); The inner peripheral wall of the second socket (124) is provided with a second convex ring (125) extending along its circumferential direction. The second tube section (13) is provided with a second thickened section (131) with a radially outward increasing wall thickness. The distal end of the second convex ring (125) axially abuts against the proximal end of the second thickened section (131) to prevent the second tube section (13) from withdrawing from the second socket (124).

6. The instrument tube assembly according to claim 5, wherein: The inner ring surface of the first convex ring (123) contacts the outer peripheral wall of the first tube section (11), and a first glue filling groove (30) surrounding the outer peripheral wall of the first tube section (11) is formed on the proximal side of the first convex ring (123) inside the first socket (122); The inner ring surface of the second convex ring (125) contacts the outer peripheral wall of the second tube section (13), and a second glue filling groove (40) surrounding the outer peripheral wall of the second tube section (13) is formed on the distal side of the second convex ring (125) inside the second socket (124).

7. An instrument tube assembly according to claim 6, wherein: The switch member (20) includes a valve plate (21), a control wire (22) connected to the valve plate (21), and a reset member (23). 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 case of the first position, the valve hole (211) is misaligned with the channel (121) to close the channel (121). In the case of the second position, the valve hole (211) is aligned with the channel (121) to open the channel (121); wherein, the control wire (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; or, the switch member (20) includes a frame (24), a film (25) covering the frame (24), a first closing wire (26) and a second closing wire (27) that are mutually attached and fixed to the inner side of the frame (24), and a control wire (28) connecting the second closing wire (27). The film (25) is provided with a slit aligned with the channel (121). The opposite sides of the slit are respectively connected to the first closing wire (26) and the second closing wire (27) to be closed to close the channel (121). The control wire (28) can drive the second closing wire (27) to deform to disengage from the first closing wire (26) to open the slit to open the channel (121). The second closing wire (27) has the ability to recover deformation to fit with the first closing wire (26); and / or, the adapter pipe section (12) is provided with a mounting groove (126), and the switch member (20) is inserted into the mounting groove (126).

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

9. The insertion part according to claim 8, characterized in that: The insertion portion (200) includes a skin (205) located at the outermost layer in its radial direction. The skin (205) extends along the axial direction of the insertion portion (200) and is axially disconnected at the channel (121) to expose the outer port of the channel (121); and / or, the adapter pipe section (12) is disposed at the distal end of the passive bending section (203) of the insertion portion (200). Axial shoulders (127) are formed on the proximal and distal ends of the outer peripheral wall of the adapter pipe section (12). 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 pipe shell (204) of the passive bending section (203) are respectively sleeved on the journal (128) of the corresponding axial shoulder (127) and axially abut against the step surface (129) of the corresponding axial shoulder (127).

10. An endoscope (300), characterized in that: Comprising a handle (301) and the insertion part (200) as described in claim 8 or 9, the proximal end of the insertion part (200) is connected to the handle (301), 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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