A guiding catheter sheath for an endoscope, an endoscope, and an application method

Abstract

The present invention relates to a guiding catheter sheath, an endoscope, and an application method thereof, including a guiding tube body. A working channel and a fluid channel are provided on the guiding tube body. The guiding tube body includes a follow-up bending section disposed at the distal end. The fluid channel is a closed space, and at least part of the fluid channel is correspondingly arranged with the follow-up bending section. A regulation interface communicating with the fluid channel is provided at the proximal end of the guiding tube body. The regulation interface is used to adjust the fluid pressure in the fluid channel so as to realize the stiffness adjustment of the fluid channel corresponding to the follow-up bending section. The present invention can not only meet the requirement of quickly and accurately reaching the target position, but also effectively increase the observation and operation space of the endoscope insertion part at the target position after reaching the target position, improve the observation and operation space of the endoscope corresponding to a single surgical area opening, thereby effectively reducing the number of surgical area openings required for performing a complete operation, improving the efficiency of minimally invasive surgery, and reducing the pain and injury of patients.

Description

Technical Field

[0001] The present invention relates to the technical field of endoscopes, and in particular to a guide tube sheath of an endoscope, an endoscope, and an application method. Background Art

[0002] As an important medical device in modern minimally invasive surgery, the operator can insert the endoscope into the human body to detect and operate the human body cavity environment. At the same time, by operating the endoscope handle located outside the human body, the bending angle of the active bending part at the front end of the insertion part can be adjusted, so that it can be deflected in a predetermined direction, helping people obtain a larger observation and operation space.

[0003] Existing endoscopic technology can insert the endoscope into the human body through natural channels or surgical openings. When using the surgical opening method, in order to ensure that the endoscope insertion part can quickly and accurately insert into the target position, a guide sheath is required to guide the endoscope insertion part. In the process of realizing the present invention, the applicant found that since the guide sheath needs to maintain a certain rigidity to constrain the endoscope insertion part to ensure that the endoscope insertion part can quickly and accurately insert into the target position, the observation and operation space corresponding to a single surgical opening is small. Therefore, in actual application, multiple surgical openings are generally required to achieve complete observation or operation of the human body cavity. Opening multiple surgical openings will cause the operation to take a long time and cause great damage to the human body. Summary of the invention

[0004] The purpose of this application is to provide an endoscope guide sheath, an endoscope, and an application method to solve the above technical problems existing in the prior art, mainly including the following three aspects:

[0005] The first aspect of the present application provides a guide tube sheath of an endoscope, including a guide tube body, on which a working channel and a fluid cavity are arranged, the working channel and the fluid cavity are respectively arranged along the length direction of the guide tube body, the working channel is used to place the endoscope insertion part, the guide tube body includes a follower bending section arranged at the distal end, the fluid cavity is a closed space, the fluid cavity is at least partially arranged corresponding to the follower bending section, the proximal end of the guide tube body is provided with a control interface connected to the fluid cavity, the control interface is used to adjust the fluid pressure in the fluid cavity to achieve stiffness adjustment of the follower bending section corresponding to the fluid cavity, the fluid cavity includes a first state and a second state, in the first state, the fluid pressure of the fluid cavity is greater than the first preset pressure value, so that the follower bending section constrains the bending deformation of the endoscope insertion part; in the second state, the fluid pressure of the fluid cavity is less than the second preset pressure value, so that the follower bending section can produce a coordinated bending deformation when the endoscope insertion part is bent and deformed.

[0006] Further, the follow - up bending section and / or the guiding tube body are made of flexible materials.

[0007] Further, the fluid cavity is arranged in a spiral shape around the working channel.

[0008] Further, a plurality of fluid cavities are arranged on the guiding tube body, and the plurality of fluid cavities are arranged around the working channel.

[0009] Further, a drainage channel is further arranged on the guiding tube body. The drainage channel is arranged along the length direction of the guiding tube body. The distal end of the drainage channel passes through the wall surface of the guiding tube body and communicates with the outside. A drainage interface communicated with the drainage channel is arranged at the proximal end of the guiding tube body.

[0010] Further, two fluid cavities are arranged on the guiding tube body. The corresponding cavity planes of the two fluid cavities pass through the central axis of the working channel, and the cavity planes coincide with the deformation planes where the endoscope insertion part generates bending deformation.

[0011] Further, a connecting structure is arranged on the guiding tube body. The connecting structure is used to realize the detachable connection between the guiding tube body and the endoscope handle or the endoscope insertion part.

[0012] Further, the connecting structure includes a flared opening arranged at the proximal end of the guiding tube body. The working channel is communicated with the flared opening, and the guiding tube body is detachably connected with the endoscope handle or the endoscope insertion part through the flared opening.

[0013] In the second aspect of the present application, an endoscope is provided, including an endoscope handle, an endoscope insertion part, and the above - mentioned guiding tube sheath. The distal end of the endoscope handle is connected to the proximal end of the endoscope insertion part. The endoscope insertion part is inserted into the working channel of the guiding tube sheath. The endoscope insertion part includes an active bending section arranged at the distal end, and the active bending section is correspondingly arranged with the follow - up bending section.

[0014] In the third aspect of the present application, a method for using the above - mentioned guiding tube sheath or the above - mentioned endoscope is provided, including the following steps:

[0015] Step S100, insert the endoscope insertion part into the working channel of the guiding tube sheath, and make the active bending section of the endoscope insertion part correspond to the follow - up bending section of the guiding tube sheath;

[0016] Step S200, introduce fluid into the fluid cavity to increase the fluid pressure in the fluid cavity, and increase it until the fluid pressure in the fluid cavity is not less than the first preset pressure value;

[0017] Step S300, insert the guiding tube sheath and the endoscope insertion part into the human body cavity along the opening of the surgical area and extend them to the target position;

[0018] Step S400: Extract the fluid in the fluid channel to reduce the fluid pressure in the fluid channel until the fluid pressure in the fluid channel is not greater than the second preset pressure value; then drive the active bending section to generate a directional bend.

[0019] The present invention has at least the following technical effects compared with the prior art:

[0020] By regulating the fluid pressure in the fluid channel of the present invention, the stiffness of the follower bending section is changed, enabling the guiding sheath to not only meet the requirement of quickly and accurately reaching the target position, but also effectively increase the observation and operation space of the endoscopic insertion part at the target position after reaching the target position, improve the observation and operation space of the endoscope corresponding to a single surgical area opening, thereby effectively reducing the number of surgical area openings required for performing a complete operation, improving the efficiency of minimally invasive surgery, and reducing the pain and injury of patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments of the present invention or the prior art. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a schematic structural diagram of the guiding sheath of the present invention;

[0023] Figure 2 is a front view of the guiding sheath of the present invention;

[0024] Figure 3 is Figure 2 a sectional view taken along the A-A direction of the guiding sheath (including two fluid channels) in ;

[0025] Figure 4 is Figure 2 a sectional view taken along the A-A direction of the guiding sheath (including four fluid channels) in ;

[0026] Figure 5 is a side view of the guiding sheath of the present invention;

[0027] Figure 6 is Figure 5 a sectional view taken along the B-B direction in ;

[0028] Figure 7 is Figure 5 a sectional view taken along the C-C direction in ;

[0029] Figure 8 is a schematic structural diagram of the spiral fluid channel surrounding the working channel;

[0030] Figure 9 It is a schematic structural diagram of the endoscope of the present invention (the endoscope insertion part is inserted through the guiding catheter sheath);

[0031] Figure 10 It is a schematic structural diagram of the endoscope of the present invention (the guiding catheter sheath is separated from the endoscope insertion part);

[0032] In the figure,

[0033] 100. Guiding tube body; 110. Follow-up bending section; 120. Working channel; 130. Fluid cavity; 131. Regulation interface; 140. Drainage channel; 141. Drainage interface; 150. Support member; 160. Bell mouth; 170. Inner tube; 180. Outer tube; 200. Endoscope handle; 300. Endoscope insertion part; 310. Active bending section. Specific embodiments

[0034] The following description provides many different embodiments or examples for implementing different features of the present invention. The elements and arrangements described in the following specific examples are only used to concisely express the present invention, and they are only examples and not intended to limit the present invention.

[0035] To make the purpose, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. 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. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0037] In the present invention, unless otherwise clearly defined and limited, the first feature being above or below the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features therebetween rather than direct contact. Moreover, the first feature being above, over, and on top of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0038] In addition, in the present invention, "proximal end" and "distal end" are the positions of the present structure relative to the human body during use, which are used to facilitate the description of the positional relationship between components and are also convenient for understanding; for the same component, "proximal end" and "distal end" are the relative positional relationships of the component, rather than absolute; therefore, it should be understood from the perspective of implementing the principle of the present invention and cannot deviate from the essence of the present invention.

[0039] Embodiment 1:

[0040] The embodiment of the present application provides a guiding catheter sheath for an endoscope, as Figures 1 to 7 shown, which includes a guiding tube body 100. A working channel 120 and a fluid channel 130 are provided on the guiding tube body 100. The working channel 120 and the fluid channel 130 are respectively arranged along the length direction of the guiding tube body 100. The working channel 120 is used for placing the insertion part 300 of the endoscope. The guiding tube body 100 includes a follow-up bending section 110 provided at the distal end. The fluid channel 130 is a closed space. At least part of the fluid channel 130 is correspondingly arranged with the follow-up bending section 110. A regulation interface 131 communicated with the fluid channel 130 is provided at the proximal end of the guiding tube body 100. The regulation interface 131 is used for regulating the fluid pressure in the fluid channel 130 to realize the stiffness regulation of the follow-up bending section 110 corresponding to the fluid channel 130. The fluid channel 130 includes a first state and a second state. In the first state, the fluid pressure in the fluid channel 130 is greater than a first preset pressure value to realize the constraint of the follow-up bending section 110 on the bending deformation of the insertion part 300 of the endoscope; in the second state, the fluid pressure in the fluid channel 130 is less than a second preset pressure value to realize that the follow-up bending section 110 can generate a cooperative bending deformation when the insertion part 300 of the endoscope undergoes a bending deformation.

[0041] In the existing endoscope technology, it can be inserted into the human body through natural channels or openings in the surgical area. When using the method of opening in the surgical area, since the insertion part 300 of the endoscope is relatively soft and easy to bend, in order to ensure that the insertion part 300 of the endoscope can quickly and accurately reach the target position, a guiding catheter sheath is required to guide the insertion part 300 of the endoscope, and the rigid characteristics of the guiding catheter sheath are used to constrain the insertion part 300 of the endoscope, avoiding the bending of the insertion part 300 of the endoscope during the penetration process, so as to ensure that the insertion part 300 of the endoscope can quickly and accurately reach the target position. At the same time, due to the small and complex space of the human body cavity, the insertion part 300 of the endoscope is actually in a restricted space at the target position, and the insertion part 300 of the endoscope also needs to extend out of the guiding catheter sheath to generate a bending deformation. Therefore, the observation and operation space corresponding to a single opening in the surgical area is small. Furthermore, in the actual application process, in order to ensure the complete implementation of the operation, generally multiple openings in the surgical area are required to achieve the complete observation or operation of the human body cavity. However, opening multiple openings in the surgical area will cause problems such as an increase in the operation time and an increase in the damage to the human body; in this embodiment, the structure of the guiding catheter sheath is improved so that the stiffness of the guiding catheter sheath can be switched in a timely manner according to different usage states. In some example application processes, after opening an opening in the surgical area, fluid is introduced into the fluid cavity 130 from the control interface 131 to increase the fluid pressure in the fluid cavity 130 and increase it to not less than the first preset pressure value, that is, the fluid cavity 130 is controlled to the first state. During the pressurization process, with the increase in the fluid pressure in the fluid cavity 130, the stiffness of the follow-up bending section 110 corresponding to the fluid cavity 130 also increases synchronously until in the first state, the stiffness of the follow-up bending section 110 can limit the active bending section 310 of the insertion part 300 of the endoscope and constrain the bending deformation of the insertion part 300 of the endoscope occurring in the deformation plane, avoiding large bending deformation, and generally making the guiding tube body 100 and the insertion part 300 of the endoscope maintain a certain rigidity during the penetration process to meet the requirement of quickly and accurately reaching the target position through the opening in the surgical area;After the guiding tube body 100 and the endoscope insertion part 300 extend to the target position in the human body cavity, the fluid in the fluid cavity 130 is led out from the regulation interface 131 to reduce the fluid pressure in the fluid cavity 130, and the fluid pressure is reduced to not greater than the second preset pressure value. At this time, the fluid cavity 130 is controlled to the second state. During the pressure reduction process, with the reduction of the fluid pressure in the fluid cavity 130, the stiffness of the corresponding follow-up bending section 110 of the fluid cavity 130 also decreases synchronously. Until in the second state, when the endoscope insertion part 300 undergoes a bending deformation, the follow-up bending section 110 can cooperate with the endoscope insertion part 300 to generate an adaptive bending deformation. Furthermore, when the active bending section 310 of the endoscope insertion part 300 is manipulated by the traction rope to perform a directional bending in the deformation plane, the follow-up bending section 110 of the guiding tube body 100 can also follow the active bending section 310 to generate an adaptive directional bending, thereby effectively increasing the observation and operation space of the endoscope insertion part 300 at the target position, improving the observation and operation space of the endoscope corresponding to a single surgical area opening, and thus effectively reducing the number of surgical area openings required for performing a complete operation, improving the efficiency of minimally invasive surgery, and reducing the pain and injury of patients.

[0042] In addition, when the fluid cavity 130 switches between the first state and the second state, the stiffness of the corresponding part of the fluid cavity 130 and the guiding tube body 100 will change. Especially when the length of the fluid cavity 130 is close to the length of the guiding tube body 100, the switching of the fluid pressure state of the fluid cavity 130 corresponds to the stiffness switching of the entire guiding tube body 100 (including the follow-up bending section 110). In this structure, after the endoscope insertion part 300 and the guiding tube sheath extend to the target position and switch to the second state, due to the reduction of the stiffness of the entire guiding tube body 100, the guiding tube body 100 and the endoscope insertion part 300 can generate appropriate passive bending deformations along with the cavity of the human body cavity corresponding to the inserted part, so as to reduce the damage to the inner wall of the human body cavity in contact with the guiding tube sheath and reduce the surgical risk; and when the fluid cavity 130 is only correspondingly arranged with the follow-up bending section 110, the switching of the fluid pressure state of the fluid cavity 130 corresponds to the stiffness regulation of the follow-up bending section 110. In this structure, the volume of the fluid cavity 130 is smaller, and thus only a small amount of fluid needs to be input or output regulated to quickly regulate the fluid pressure to the predetermined pressure, improving the regulation efficiency and the convenience of equipment use.

[0043] It should be noted that the volume of the fluid cavity 130 will not change during the state switching process. That is to say, when the fluid pressure in the fluid cavity 130 increases or decreases, the volume of the fluid cavity 130 remains approximately unchanged. This performance is specifically affected by the material of the wall surface corresponding to the fluid cavity 130, that is, there are upper and lower limits for the fluid pressure regulation of the fluid cavity 130.

[0044] Specifically, the first preset pressure value is greater than the second preset pressure value. It should be noted that the first preset pressure value and the second preset pressure value are determined according to the stiffness of the guiding catheter sheath in the actual use environment.

[0045] Specifically, the follow-up bending section 110 is made of a flexible material so as to generate an adaptive bending deformation following the insertion part 300 of the endoscope in the second state. In this structure, the fluid channel 130 can be correspondingly arranged only with the follow-up bending section 110, and the part of the guiding tube body 100 other than the follow-up bending section 110 is made of a rigid material to ensure that the stiffness of the guiding catheter sheath meets the requirement of quickly and accurately extending into the target position.

[0046] In some embodiments, the guiding tube body 100 can be made of a flexible material. In this structure, the length of the fluid channel 130 is substantially the same as that of the guiding tube body 100, and the switching of the fluid pressure state of the fluid channel 130 corresponds to the switching of the stiffness of the entire guiding tube body 100 (including the follow-up bending section 110). Since the stiffness of the entire guiding tube body 100 is small, in the second state, the guiding tube body 100 and the insertion part 300 of the endoscope can generate appropriate passive bending deformations following the body cavity channel of the human body where the insertion part is located, so as to reduce the damage to the inner wall of the human body cavity in contact with the guiding catheter sheath and reduce the surgical risk.

[0047] In some embodiments, as Figure 8 shown, the fluid channel 130 can be arranged in a spiral shape around the working channel 120. In this way, during use, when the guiding catheter sheath and the insertion part 300 of the endoscope extend to the target position of the human body cavity, during the process of reducing the fluid pressure in the fluid channel 130, the guiding catheter sheath is easily compressed by the action of the human body cavity in the length direction, and then the end of the insertion part 300 of the endoscope will be exposed, reducing the constraint effect of the guiding catheter sheath on the visual range of the end of the insertion part 300 of the endoscope, and improving the observation and operation space of the insertion part 300 of the endoscope at the target position. In some examples, multiple spiral-shaped fluid channels 130 can also be provided, and the multiple fluid channels 130 are respectively arranged around the working channel 120 to increase the stiffness of the follow-up bending section in the first state.

[0048] In some embodiments, as Figure 4As shown, a plurality of fluid channels 130 can be provided on the guiding tube body 100. The plurality of fluid channels 130 are arranged around the working channel 120 and can be arranged on the same circumference. In this way, stiffness adjustment of the guiding tube body 100 can be achieved through the fluid channels 130 starting from multiple radial positions, without the need to restrict the relative circumferential direction of the endoscopic insertion portion 300 within the working channel, improving the convenience of equipment use. The fluid channels 130 can be arranged linearly along the length direction of the guiding tube body 100 or in a w-shaped wave form along the length direction of the guiding tube body 100.

[0049] In some embodiments, since the active bending section 310 of the endoscopic insertion portion 300 is generally controlled by two traction ropes on both sides to cause directional bending of the active bending section 310 in the deformation plane, two linear fluid channels 130 can be provided on the guiding tube body 100. The planes corresponding to the two fluid channels 130 are the channel planes. The channel plane passes through the central axis of the working channel 120 and coincides with the deformation plane in which the endoscopic insertion portion 300 generates bending deformation. In this way, during use, in the first state, the stiffness corresponding to the fluid channel 130 is the greatest. Therefore, by using the channel plane with the greatest stiffness to constrain the bending deformation of the endoscopic insertion portion 300 occurring in the deformation plane, it is possible to not only constrain the endoscopic insertion portion 300 to be generally in a straight state, but also reduce the requirements for fluid pressure during the state switching process of the fluid channel 130, improving the convenience of fluid pressure regulation.

[0050] It should be noted that the fluid can be a gas, a liquid, a solid-liquid mixture, or a solid-gas mixture. When using a solid-liquid mixture or a solid-gas mixture, the solid is preferably in a spherical structure; in addition, the gas is preferably an inert gas, the liquid is preferably a sterile liquid or physiological saline, and the solid is preferably ceramic; by introducing fluids in different states and densities, the stiffness of the follow-up bending section 110 in the first state can be controlled (under the same fluid pressure) to meet the usage requirements of different scenarios.

[0051] Specifically, a drainage channel 140 is further provided on the guiding tube body 100. The drainage channel 140 is arranged along the length direction of the guiding tube body 100. The distal end of the drainage channel 140 penetrates through the wall surface of the guiding tube body 100 and communicates with the outside. A drainage interface 141 communicating with the drainage channel 140 is provided at the proximal end of the guiding tube body 100. After the endoscopic insertion part 300 is guided into the target position in the human body by using the guiding tube sheath, the functional fluid can be ejected through the instrument tube of the endoscopic insertion part 300 to act on the target position in the human body cavity, and then the drainage channel 140 is used to recover the functional fluid to avoid the retention of the functional fluid in the human body cavity. It should be noted that the functional fluid can be gas, liquid, solid particles or their combinations, specifically gaseous medical agents, liquid medical agents and solid particle medical agents.

[0052] In some embodiments, the guiding tube body 100 includes an inner tube 170 and an outer tube 180 arranged in sequence from inside to outside. The working channel 120 is located inside the inner tube 170, and the fluid channel 130 and the drainage channel 140 are respectively located between the inner tube 170 and the outer tube 180. Further, to ensure the structural stability of the guiding tube sheath, a support member 150 can be provided between the inner tube 170 and the outer tube 180, and the fluid channel 130 and / or the drainage channel 140 can be embedded in the support member 150. In some examples, to ensure space utilization, the inner tube 170 and the outer tube 180 can be coaxially arranged, and the support member 150 is used to connect and support the inner tube 170 and the outer tube 180. The arc-shaped cavity between the inner tube 170 and the outer tube 180 serves as the drainage channel 140, and the fluid channel 130 is embedded in the support member 150. In this structure, especially in the structure with two support members 150 located on the same diameter, the stiffness of the fluid channel 130 corresponding to the channel plane is greater, and further, the requirement for fluid pressure during the state switching of the fluid channel 130 can be reduced, and the convenience of fluid pressure regulation can be improved.

[0053] In some embodiments, to ensure the isolation between each channel, the guiding tube body 100 can also be set as a multi-tube structure of 1 + 1 + N, that is, a first tube body provided with a working channel 120, a second tube body provided with a drainage channel 140, the first tube body and the second tube body are connected and arranged in parallel, and N third tube bodies provided with fluid channels 130, and the N third tube bodies surround the first tube body and the second tube body.

[0054] Specifically, a connection structure is provided on the guiding tube body 100, and the connection structure is used to detachably connect the guiding tube body 100 to the insertion portion 300 of the endoscope. By providing a connection structure on the guiding tube body 100 for connecting to the insertion portion 300 of the endoscope, it is possible to adapt one guiding tube sheath to multiple insertion portions 300 of endoscopes with different length dimensions, so as to ensure that during the installation process, the follow-up bending section 110 can always correspond to the active bending section 310, improving the convenience of use of the guiding tube sheath. For example, when the guiding tube body 100 is designed to be ten unit lengths, for an endoscope insertion portion 300 with a length of ten units, during the process of the endoscope insertion portion 300 penetrating into the working channel 120, directly abutting the proximal end of the guiding tube sheath against the endoscope handle 200 can ensure that the follow-up bending section 110 corresponds to the active bending section 310; when the guiding tube body 100 is designed to be ten unit lengths, for an endoscope insertion portion 300 with a length of fifteen units, during the process of the endoscope insertion portion 300 penetrating into the working channel 120, directly aligning the distal end of the endoscope insertion portion 300 with the distal end of the guiding tube sheath can ensure that the follow-up bending section 110 corresponds to the active bending section 310; similarly, for the case where the length of the endoscope insertion portion 300 is more than ten units, during the process of the endoscope insertion portion 300 penetrating into the guiding tube sheath, aligning the distal end of the endoscope insertion portion 300 with the distal end of the guiding tube sheath can be used to achieve the correspondence between the follow-up bending section 110 and the active bending section 310, ensuring the realization of the adjustment of the use state of the guiding tube sheath for the endoscope insertion portion 300. In addition, it should be noted that the detachable connection is a prior art, and specifically can be a threaded connection, a snap connection, an interference fit or a slide rail fit connection, and no specific limitation is made here.

[0055] In some embodiments, the connection structure can also be set to be used to detachably connect the guiding tube body 100 to the endoscope handle 200.

[0056] In some embodiments, the connection structure can be set to include a flared mouth 160 provided at the proximal end of the guiding tube body 100. The working channel 120 communicates with the flared mouth 160, and the guiding tube body 100 is detachably connected to the endoscope handle 200 or the insertion portion 300 of the endoscope through the flared mouth 160.

[0057] Embodiment 2:

[0058] The embodiment of the present application provides an endoscope, such as Figure 9 and Figure 10As shown, it includes an endoscope handle 200, an endoscope insertion portion 300, and the guiding catheter sheath in Embodiment 1. The distal end of the endoscope handle 200 is connected to the proximal end of the endoscope insertion portion 300. The endoscope insertion portion 300 is inserted through the working channel 120 of the guiding catheter sheath. The endoscope insertion portion 300 includes an active bending section 310 provided at the distal end, and the active bending section 310 is correspondingly arranged with the follower bending section 110. During use, after opening the surgical area opening, fluid is introduced into the fluid channel 130 through the control interface 131 to increase the fluid pressure in the fluid channel 130, so as to achieve pressurization to the first state and increase the stiffness of the follower bending section 110. The rigid follower bending section 110 is used to constrain the bending deformation of the active bending section 310, ensuring that the guiding catheter sheath and the endoscope insertion portion 300 can quickly and accurately extend into the target position of the human body cavity through the surgical area opening. After the endoscope insertion portion 300 reaches the target position of the human body cavity, the fluid in the fluid channel 130 is output outward through the control interface 131 to reduce the fluid pressure in the fluid channel 130, so as to achieve depressurization to the second state and reduce the stiffness of the follower bending section 110, enabling the follower bending section 110 to adaptively bend directionally following the active bending section 310. At this time, the operator can drive the traction rope through the endoscope handle (the technology and structure of using the endoscope handle to drive the traction rope are prior arts and will not be elaborated here), so as to drive the active bending section 310 to generate directional bending deformation, and the follower bending section 110 can cooperate with the active bending section 310 to synchronously generate directional bending under the drive of the traction rope, thereby effectively increasing the movement range of the endoscope insertion portion 300 in a limited space, increasing the observation and operation space of the endoscope insertion portion 300 at the target position, improving the observation and operation space of the endoscope corresponding to a single surgical area opening, and thus effectively reducing the number of surgical area openings required for performing a complete operation, improving the efficiency of minimally invasive surgery, and reducing the pain and injury of patients.

[0059] It should be noted that the endoscope in the embodiment 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 embodiment of the present application does not specifically limit the type of the endoscope.

[0060] Embodiment 3:

[0061] The embodiment of the present application provides a method for using the guiding catheter sheath in Embodiment 1 or the endoscope in Embodiment 2, including the following steps:

[0062] Step S100, insert the endoscope insertion portion 300 through the working channel 120 of the guiding catheter sheath, and make the active bending section 310 of the endoscope insertion portion 300 correspond to the follower bending section 110 of the guiding catheter sheath;

[0063] Step S200: Introduce fluid into the fluid channel 130 to increase the fluid pressure in the fluid channel 130 until the fluid pressure in the fluid channel 130 is not less than the first preset pressure value.

[0064] Step S300: Insert the guiding sheath and the endoscope insertion part 300 into the human body cavity along the opening of the surgical area and extend them to the target position.

[0065] Step S400: Drain the fluid in the fluid channel 130 to reduce the fluid pressure in the fluid channel 130 until the fluid pressure in the fluid channel 130 is not greater than the second preset pressure value; then drive the active bending section to generate a directional bend.

[0066] By regulating the fluid pressure in the fluid channel 130 under different environments, the stiffness of the follower bending section 110 is changed, enabling the guiding sheath to not only meet the requirement of quickly and accurately reaching the target position, but also effectively increase the observation and operation space of the endoscope insertion part 300 at the target position after reaching the target position, improving the observation and operation space corresponding to a single surgical area opening, thereby effectively reducing the number of surgical area openings required for performing a complete operation, improving the efficiency of minimally invasive surgery, and reducing the pain and injury of patients.

[0067] Specifically, during the process of threading the endoscope insertion part 300 through the working channel 120 of the guiding sheath, when two linear fluid channels 130 are provided on the guiding tube body 100, the plane corresponding to the two fluid channels 130 is the channel plane. Make the channel plane pass through the central axis of the working channel 120, and the channel plane coincide with the deformation plane where the active bending section 310 generates a bending deformation to improve the efficiency of fluid pressure regulation.

[0068] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A guiding catheter sheath for an endoscope, characterized in that, It includes a guiding tube body (100), on which a working channel (120) and a fluid channel (130) are provided. The working channel (120) and the fluid channel (130) are respectively arranged along the length direction of the guiding tube body (100). The working channel (120) is used to place the insertion part (300) of the endoscope. The guiding tube body (100) includes a follow-up bending section (110) arranged at the distal end. The fluid channel (130) is a closed space, and at least part of the fluid channel (130) is correspondingly arranged with the follow-up bending section (110). A regulating interface (131) communicating with the fluid channel (130) is arranged at the proximal end of the guiding tube body (100). The regulating interface (131) is used to adjust the fluid pressure in the fluid channel (130) so as to realize the stiffness adjustment of the follow-up bending section (110) corresponding to the fluid channel (130). The fluid channel (130) includes a first state and a second state. In the first state, the fluid pressure in the fluid channel (130) is greater than a first preset pressure value to realize the restraint of the bending deformation of the follow-up bending section (110) on the insertion part (300) of the endoscope. In the second state, the fluid pressure in the fluid channel (130) is less than a second preset pressure value to realize that the follow-up bending section (110) can generate a cooperative bending deformation when the insertion part (300) of the endoscope undergoes a bending deformation.

2. The guiding sheath according to claim 1, characterized in that, The follow-up bending section (110) and / or the guiding tube body (100) is made of a flexible material.

3. The guiding sheath according to claim 2, wherein The fluid channel (130) is arranged in a spiral shape around the working channel (120).

4. The guiding sheath according to claim 2, wherein, A plurality of fluid channels (130) are provided on the guiding tube body (100), and the plurality of fluid channels (130) are arranged around the working channel (120).

5. The guiding sheath according to any one of claims 1 to 4, characterized in that, A drainage channel (140) is further provided on the guiding tube body (100). The drainage channel (140) is arranged along the length direction of the guiding tube body (100). The distal end of the drainage channel (140) passes through the wall surface of the guiding tube body (100) and communicates with the outside. A drainage interface (141) communicating with the drainage channel (140) is arranged at the proximal end of the guiding tube body (100).

6. The guiding cannula according to claim 5, wherein, Two fluid channels (130) are provided on the guiding tube body (100). The corresponding channel planes of the two fluid channels (130) pass through the central axis of the working channel (120), and the channel planes coincide with the deformation plane where the insertion part (300) of the endoscope generates a bending deformation.

7. The guiding sheath according to any one of claims 1 to 4, characterized in that A connecting structure is provided on the guiding tube body (100), and the connecting structure is used to realize the detachable connection between the guiding tube body (100) and the endoscope handle (200) or the insertion part (300) of the endoscope.

8. The guiding sheath according to claim 7, characterized in that, The connecting structure includes a flared mouth (160) arranged at the proximal end of the guiding tube body (100). The working channel (120) communicates with the flared mouth (160), and the guiding tube body (100) is detachably connected to the endoscope handle (200) or the insertion part (300) of the endoscope through the flared mouth (160).

9. An endoscope, characterized in that, It includes an endoscope handle (200), an endoscope insertion section (300), and the guiding catheter sheath according to any one of claims 1 to 8. The distal end of the endoscope handle (200) is connected to the proximal end of the endoscope insertion section (300). The endoscope insertion section (300) is disposed in the working channel (120) of the guiding catheter sheath, and includes an active bending section (310) provided at the distal end. The active bending section (310) is correspondingly arranged with the follower bending section (110).

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