An adjustable bending sheath and an adjustable bending system

Abstract

The present invention provides an adjustable bending sheath, comprising: an outer tube and an inner tube, wherein the inner tube is arranged inside the outer tube and extends along the axial direction of the outer tube; the inner tube includes a bending section and an inner tube main body section, the bending section is located at the distal end, and the inner tube main body section is located at the proximal end; the outer tube includes an outer tube distal section and an outer tube main body section, the outer tube distal section is located at the distal end, and the outer tube main body section is located at the proximal end; the inner tube further includes a rotating head, the rotating head is arranged at the distal end of the bending section and can rotate relative to the outer tube distal section, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube. By optimizing the assembly relationship of the rotating head, the bending radius of the adjustable bending sheath is reduced, and the rotating head can accurately and quickly align with the target position.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an adjustable bending sheath and an adjustable bending system. Background Art

[0002] The adjustable bending sheath is a sheath tube assembly applied in the process of interventional and minimally invasive treatment surgeries. It consists of two parts, namely a sheath tube (also known as an outer sheath, outer tube, etc.) and a sheath core (also known as an inner sheath, inner tube, etc.). Through the operation of a handle, the distal end of the sheath tube can be bent within a certain angle range. After the distal end of the sheath tube is bent, the tip of the sheath tube can point to the target position, facilitating the surgical operation of the curved path during the surgery. However, in the prior art, the relatively large bending radius of the adjustable bending sheath has always restricted the medical device from reaching the target position during the surgery. In addition, in the prior art, the distal end of the sheath tube is bent by a traction wire, and it is necessary to synchronously bend the sheath tube and the sheath core, and their bending forms are basically the same. During the above-mentioned bending process, the pulling force of the traction wire is relatively large, and the anchoring ring and the traction wire are easily broken, resulting in the failure of bending adjustment, thereby causing operation risks and affecting the surgical safety. Therefore, how to reduce the bending radius of the adjustable bending sheath, or reduce the problems or risks caused by the traction wire, etc. are the problems that need to be overcome urgently at present. Summary of the Invention

[0003] In order to overcome at least one of the many problems in the related art, the first aspect of the present invention provides an adjustable bending sheath. Among them, the adjustable bending sheath includes:

[0004] An outer tube and an inner tube, the inner tube is disposed inside the outer tube and extends along the axial direction of the outer tube;

[0005] The inner tube includes a bending adjustment section and an inner tube main body section, the bending adjustment section is located at the distal end, and the inner tube main body section is located at the proximal end;

[0006] The outer tube includes an outer tube distal section and an outer tube main body section, the outer tube distal section is located at the distal end, and the outer tube main body section is located at the proximal end;

[0007] The inner tube further includes a rotating end head, the rotating end head is disposed at the distal end of the bending adjustment section and can rotate relative to the outer tube distal section, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube.

[0008] In some optional embodiments, at least a part of the inner tube can move relative to the axis of the outer tube, and the movement drives the rotating end head to generate the rotation movement.

[0009] In some optional embodiments, at least a part of the side wall of the outer tube distal section includes an opening part, and at least a part of the bending adjustment section of the inner tube penetrates through the side wall through the opening part and moves away from the outer tube distal section when being bent.

[0010] In some alternative embodiments, the distal section of the outer tube includes a connecting rod, and the connecting rod is connected to the main body section of the outer tube;

[0011] An opening is provided on the side wall of the connecting rod to form the open part.

[0012] In some alternative embodiments, a rotating shaft hole is provided at the distal end of the connecting rod, and a rotating shaft is provided at the distal end of the bending section of the inner tube;

[0013] The rotating shaft is engaged with the rotating shaft hole to guide the rotating end to rotate relative to the distal section of the outer tube.

[0014] In some alternative embodiments, the rotating shaft hole is an eccentric hole. When the inner tube moves distally relative to the outer tube, the rotating shaft is subjected to the eccentric force of the rotating shaft hole, so that at least part of the bending section penetrates through the side wall through the open part and moves in a direction away from the axis of the outer tube; or,

[0015] The axis of the rotating shaft is arranged offset from the axis of the inner tube. When the inner tube moves distally relative to the outer tube, the rotating shaft is subjected to the eccentric force of the rotating shaft hole, so that at least part of the bending section penetrates through the side wall through the open part and moves in a direction away from the axis of the outer tube.

[0016] In some alternative embodiments, at least part of the inner wall of the connecting rod is provided with a convex part;

[0017] When not bending, the convex part is adjacent to or abuts against the outer wall of the bending section of the inner tube;

[0018] When bending, the convex part guides at least part of the bending section to penetrate through the side wall through the open part and move in a direction away from the axis of the outer tube.

[0019] In some alternative embodiments, it further includes a bending section, and the bending section is arranged at the distal end of the connecting rod, and the bending section is connected to the rotating end;

[0020] When at least part of the inner tube moves relative to the axis of the outer tube, the bending section is bent and deformed to drive the rotating end to move, so that the rotating end rotates relative to the distal section of the outer tube, and the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube.

[0021] In some alternative embodiments, the bending section is integrally formed with the side wall of the connecting rod, and the stiffness of the bending section is less than the stiffness of the connecting rod.

[0022] The second aspect of the present invention provides an adjustable bending system. It includes an operating part and the bending sheath according to any one of the first aspect. The operating part is used to control at least part of the inner tube to move distally or proximally relative to the axis of the outer tube, so as to adjust the rotation angle of the rotating head.

[0023] The technical solution of the present invention has the following advantages or beneficial effects:

[0024] In some embodiments of the present invention, by optimizing the assembly relationship of the rotating head, it can rotate relative to the distal section of the outer tube, and the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube, so as to reduce the bending radius of the bending sheath, and enable the rotating head to accurately and quickly align with the target position.

[0025] In some embodiments of the present invention, the traction wire is discarded, thus effectively avoiding various problems caused by the deformation of the traction wire guiding sheath tube. After removing the traction wire, in this embodiment, by driving the relative displacement relationship between the inner tube and the outer tube, the distal end of the inner tube is deformed and the rotating head is rotated, thus effectively solving the problem of the driving force required for the rotation of the rotating head at the distal end of the inner tube.

[0026] In some embodiments of the present invention, an opening part is provided at the distal end of the outer tube. After the bending section is deformed, it passes through the outer tube, so that the deformed part of the main body of the bending section occurs outside the outer wall of the outer tube, and then is fully extruded and deformed, enabling the rotating head to rotate at a large angle. Since only the deformation amount of the bending section of the inner tube needs to be controlled to control the rotation state of the rotating head, it avoids the problem in the prior art that the inner tube and the outer tube need to be bent synchronously through the traction wire to align the distal end of the sheath tube with the target, effectively reducing the bending radius of the sheath tube, enabling the distal end of the sheath tube to flexibly and quickly align with the target, and improving the applicable range of the instrument.

[0027] In some embodiments of the present invention, an independent connecting rod is provided, an opening part is provided on the connecting rod, and at the same time, the distal end of the connecting rod is fixed to the distal end of the inner tube to solve the problem of the connection between the inner tube and the outer tube. It reduces the production and manufacturing cost, and also improves the applicable reliability of the bending sheath. Description of the Drawings

[0028] The drawings are used to better understand the present invention and do not constitute an improper limitation to the present invention. Among them:

[0029] Figure 1 is a partial enlarged schematic view of the first exemplary adjustable bending sheath according to an embodiment of the present invention;

[0030] Figure 2 is a schematic view of the first exemplary adjustable bending system according to an embodiment of the present invention;

[0031] Figure 3Partial enlarged schematic view of the inner tube of the adjustable bending sheath according to the first example of the embodiment of the present invention;

[0032] Figure 4 is Figure 3 Partial enlarged schematic view of the cross-section at A-A in;

[0033] Figure 5 Schematic view of the outer tube of the adjustable bending sheath according to the first example of the embodiment of the present invention;

[0034] Figure 6 Partial enlarged schematic view of the outer tube of the adjustable bending sheath according to the first example of the embodiment of the present invention;

[0035] Figure 7 is Figure 6 Partial enlarged schematic view of the end of the outer tube in;

[0036] Figure 8 Schematic view of the cooperation between the outer tube and the distal end of the inner tube of the adjustable bending sheath according to the first example of the embodiment of the present invention;

[0037] Figure 9 Partial enlarged schematic view of the adjustable bending sheath after bending according to the first example of the embodiment of the present invention;

[0038] Figure 10 Partial enlarged schematic view of the distal end of the adjustable bending sheath after bending according to the first example of the embodiment of the present invention;

[0039] Figure 11 is Figure 9 Partial enlarged schematic view of the cross-section at B-B in;

[0040] Figure 12 Partial enlarged schematic view of the inner tube of the adjustable bending sheath according to the second example of the embodiment of the present invention;

[0041] Figure 13 Partial enlarged schematic view of the distal end of the outer tube of the adjustable bending sheath according to the second example of the embodiment of the present invention;

[0042] Figure 14 Partial enlarged schematic view of the distal end of the adjustable bending sheath after bending according to the second example of the embodiment of the present invention;

[0043] Figure 15 Partial enlarged schematic view of the outer tube of the adjustable bending sheath according to the third example of the embodiment of the present invention;

[0044] Figure 16 is Figure 15 Partial enlarged schematic view of the distal end of the outer tube in;

[0045] Figure 17 Schematic view of a connecting rod according to the embodiment of the present invention;

[0046] Figure 18 is another schematic diagram of the connecting rod according to an embodiment of the present invention;

[0047] Figure 19 is a partially enlarged schematic diagram after the bending adjustment of the fourth example adjustable bending sheath according to an embodiment of the present invention;

[0048] Figure 20 is a partially enlarged schematic diagram of the distal end after the bending adjustment of the fourth example adjustable bending sheath according to an embodiment of the present invention;

[0049] Figure 21 is a schematic diagram of the connecting rod in the fourth example adjustable bending sheath according to an embodiment of the present invention. Detailed implementation manners

[0050] The following describes exemplary embodiments of the present invention with reference to the accompanying drawings. Various details of the embodiments of the present invention are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted below.

[0051] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the", and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0052] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0053] As described in the background technology section, there are many inconveniences in the scheme of using a traction wire to guide the distal end of the sheath to bend, and even cause operational risks, affecting the safety of the operation. In order to solve at least one of the many problems in the related art mentioned in the background technology section, the first aspect of the present invention provides an adjustable bending sheath to remove the traction wire structure, thereby completely eliminating various problems caused by the traction wire. Wherein, the adjustable bending sheath includes: an outer tube and an inner tube, the inner tube is arranged inside the outer tube and extends along the axial direction of the outer tube; the inner tube includes a bending adjustment section and an inner tube main section, the bending adjustment section is located at the distal end, and the inner tube main section is located at the proximal end; the outer tube includes an outer tube distal section and an outer tube main section, the outer tube distal section is located at the distal end, and the outer tube main section is located at the proximal end; the inner tube also includes a rotating end, the rotating end is arranged at the distal end of the bending adjustment section, and can rotate relative to the outer tube distal section, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube.

[0054] like Figure 1 , Figure 2 and 19 As shown, the adjustable bending sheath provided in some embodiments of the present invention includes an outer tube 104 and an inner tube 103. The inner tube and the outer tube may be hollow structures to facilitate the insertion or installation of corresponding medical devices. For example, a guide wire or an instrument may be inserted in the hollow structure of the inner tube. The inner tube is arranged inside the outer tube and extends along the axial direction of the outer tube. Usually, the inner tube and the outer tube are in the form of round tubes to reduce production and manufacturing costs. Therefore, the inner tube and the outer tube each have their own extension axis. During assembly, the inner tube can be embedded in the hollow inner cavity of the outer tube and extended forward along the axial direction of the outer tube so that the two are nested. Preferably, the inner tube can be made of a harder material, such as a braided tube, a cutting tube, a sea wave tube, a spring tube, etc. The manufacturing material here is only an example and does not constitute a limitation on the scope of protection of the present invention. As Figure 9 or Figure 19 As shown, the inner tube includes a bending section (see Figure 9 or Figure 19 The inner tube distal end bendable portion) and the inner tube main body section (see Figure 9 or Figure 19In (the part other than the bending section), the bending section is located at the distal end, and the inner tube main body section is located at the proximal end. The outer tube includes an outer tube distal section and an outer tube main body section. The outer tube distal section is located at the distal end, and the outer tube main body section is located at the proximal end. The inner tube further includes a rotating end 102. The rotating end is provided at the distal end of the bending section and can rotate relative to the outer tube distal section, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube. In practice, in the use state of the bending sheath, its distal end will more or less deflect and deform in space, resulting in the rotation axis of the rotating end not being absolutely perpendicular to the axis of the outer tube under some working conditions. In fact, the two axes may be perpendicular or approximately perpendicular. The so-called approximate perpendicularity means that the included angle between the two axes deviates from 90° by ±15°. When the control accuracy requirement is relatively high, the deviation standard can be improved and reduced to ±10°, or even ±5°. However, this requires relatively high requirements for the selection of the manufacturing material of the sheath tube, operation control and other indicators. As Figure 9 shown, the rotation axis of the rotating end 102 is different from the axis of the inner tube or the outer tube, and it is perpendicular to the paper surface direction; while the axis of the outer tube or the inner tube is parallel to the paper surface direction. Therefore, when the rotating end rotates, it does not rotate along the axis of the inner tube or the outer tube, but rotates along the direction perpendicular to the paper surface, so that the distal end face of the rotating end quickly turns towards the side wall direction of the outer tube. In other words, when the inner tube or the outer tube extends in the blood vessel, by controlling the rotation of the rotating end, it can be quickly aligned with the target on the inner wall of the blood vessel. Preferably, when the rotating end rotates, the distal end of the outer tube is basically not deformed. In this embodiment, by optimizing the assembly relationship of the rotating end, it can rotate relative to the outer tube distal section, and the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube, so that the bending radius of the bending sheath is reduced, and the rotating end can accurately and quickly align with the target position.

[0055] In some alternative embodiments, at least a part of the inner tube can move relative to the axis of the outer tube, and the movement drives the rotating end to generate the rotation movement. Compared with the prior art, in some embodiments of the present invention, the traction wire is completely removed, and then how to manipulate the rotating end rotating rod becomes an urgent problem to be solved. For this reason, as Figure 9 and 19As shown, in some embodiments of the present invention, the inner tube and the outer tube are relatively fixed at the distal end. The relative fixation here means that the distal ends of the inner tube and the outer tube are fixedly connected, and there is no displacement or only a small amount of displacement between the two, while the main movement between the two is relative rotational movement. This rotational movement causes the normal line of the end face of the rotating end to rotate parallel to the axis direction of the outer tube to deviate from the axis. To achieve this rotational movement, in some embodiments, at least part of the inner tube is movable relative to the axis of the outer tube. As explained above, the distal end of the inner tube is relatively fixed to the distal end of the outer tube. When the inner tube moves relative to the outer tube, local torsional deformation of the inner tube will inevitably occur, causing the rotating end of the inner tube to rotate. Thus, it can be seen that the traction wire is discarded in this embodiment of the present invention, effectively avoiding various problems caused by the traction wire. After removing the traction wire, in this embodiment, by driving the relative displacement relationship between the inner tube and the outer tube, the problem of the driving force required for the rotation of the rotating end at the distal end of the inner tube is effectively solved.

[0056] In some alternative embodiments, at least part of the side wall of the distal section of the outer tube includes an opening portion. When the bending section of the inner tube is bent, at least part of it penetrates through the side wall through the opening portion and moves away from the distal section of the outer tube. In some embodiments, the diameters of both the inner tube and the outer tube are relatively small. When the inner tube moves relative to the outer tube inside the outer tube to drive the movement of the rotating end, the bending section of the inner tube will be restricted by the inner wall of the outer tube, making it unable to deform sufficiently, thereby affecting the movement of the rotating end and unable to effectively align with the target. For this reason, in some embodiments, at least part of the side wall of the distal section of the outer tube includes an opening portion. Exemplarily, the opening portion can be a through hole provided on the outer wall of the outer tube. When the bending section of the inner tube is bent, at least part of it penetrates through the side wall through the opening portion and moves away from the distal section of the outer tube. As Figure 9 shown, due to the existence of the opening portion, the bent section deforms and passes through the outer tube after deformation, causing the deformed part of the main body to occur outside the outer wall of the outer tube. The bent section is fully squeezed and deformed, enabling the rotating end to rotate at a large angle.

[0057] In some alternative embodiments, the distal section of the outer tube includes a connecting rod 1041, and the connecting rod is connected to the main body section of the outer tube; an opening is provided on the side wall of the connecting rod to form the opening portion. In practice, directly setting the opening portion on the tube body of the outer tube and then fixing the distal ends of the outer tube and the inner tube will have some manufacturing difficulties, resulting in too high production costs. For this reason, in some embodiments of the present invention, an independent connecting rod is provided, an opening portion is provided on the connecting rod, and at the same time, the distal end of the connecting rod is fixed to the distal end of the inner tube to solve the problem of the connection between the inner tube and the outer tube. Preferably, the stiffness of the connecting rod 1041 can be set to be greater than that of the inner tube, so that the outer tube has sufficient stiffness to support the bending deformation of the inner tube. AsFigure 9 As shown, when the stiffness of the connecting rod meets the deformation requirements during the intervention process, its stiffness can be appropriately greater than that of the inner tube. Then, when the inner tube moves distally, the bending section of the inner tube bends and deforms, while the connecting rod basically remains unchanged, so as to effectively control the rotation angle of the rotating head.

[0058] In some alternative embodiments, a rotating shaft hole is provided at the distal end of the connecting rod, and a rotating shaft 101 is provided at the distal end of the bending section of the inner tube; the rotating shaft cooperates with the rotating shaft hole to guide the rotating head to rotate relative to the distal section of the outer tube. See Figures 1 to 4 , Figure 4 shows that any cross-section A-A of the inner tube is a hollow structure, and a rotating shaft 101 is provided at the distal end of the bending section of the inner tube. There are 2 rotating shafts, which are symmetrically arranged on both sides of the inner tube. As Figures 5 to 8 shown, a rotating shaft hole is provided at the distal end of the connecting rod to cooperate with the rotating shaft. When the rotating shaft and the rotating shaft hole are assembled in cooperation, the rotating head of the inner tube can swing relative to the connecting rod. It can be understood that the positions of the above-mentioned rotating shaft and rotating shaft hole can be swapped, that is, the rotating shaft is provided on the connecting rod, and the rotating shaft hole is provided at the distal end of the bending section. This embodiment only shows one way of relatively fixing the inner tube and the outer tube at the distal end. In practice, other ways can also be adopted for this relative setting.

[0059] In some alternative embodiments, the rotating shaft hole is an eccentric hole. When the inner tube moves distally relative to the outer tube, the rotating shaft is subjected to the eccentric force of the rotating shaft hole so that at least part of the bending section penetrates through the side wall through the opening part and moves in a direction away from the axis of the outer tube; or, the axis of the rotating shaft is offset from the axis of the inner tube. When the inner tube moves distally relative to the outer tube, the rotating shaft is subjected to the eccentric force of the rotating shaft hole so that at least part of the bending section penetrates through the side wall through the opening part and moves in a direction away from the axis of the outer tube. As Figures 6 to 11 shown in the embodiment, the rotating shaft hole is eccentrically arranged, and the eccentricity D can be adjusted according to actual needs. For example, it can be set to be greater than or equal to 0.01 mm, etc. It should be noted that the eccentricity is the distance between the center of the eccentric hole and the axis of the rotating shaft. Specifically, as Figure 7 and 8 shown, the center of the eccentric hole is located on one side of the axis of the outer tube, and the axis of the rotating shaft intersects with the axis of the outer tube. In Figure 8In the initial assembly state shown, when no external force acts on the inner tube, the axis of the rotating shaft intersects with the axis of the outer tube. When an external force is applied to the inner tube such that a part of the outer tube moves distally relative to the outer tube, the rotating shaft will abut against and move along the inner wall of the eccentric hole, and the rotating shaft moves towards the center of the eccentric hole. During the movement, the rotating shaft is continuously subjected to the eccentric force generated by the eccentric hole. The eccentric force will push the bent section of the inner tube upwards and gradually separate from the connecting rod and pass through the opening of the connecting rod. Correspondingly, the rotating head also rotates accordingly. Figure 10 It shows a schematic diagram of the rotating shaft moving to a steady state in the eccentric hole. As Figure 11 shown, it shows the maximum radial dimension R of the distal end of the bending sheath. Since in the present invention, only the deformation amount of the bending section of the inner tube needs to be controlled to control the rotation state of the rotating head, it avoids the problem in the prior art that the inner tube and the outer tube need to be bent synchronously through a traction wire to align the distal end of the sheath to the target, thereby effectively reducing the bending radius of the sheath, enabling the distal end of the sheath to align to the target flexibly and quickly, and improving the applicable range of the instrument. In some other embodiments, as Figures 12 to 14 shown, the rotating shaft hole is arranged in a non-eccentric manner, while the rotating shaft is arranged eccentrically. The axis of the rotating shaft deviates from the axis of the inner tube by a distance F, and the value of the eccentric distance F can be flexibly adjusted according to actual needs and is not specifically limited here. For example, it can be set to be greater than or equal to 0.01 mm, etc. Similar to the aforementioned eccentric hole solution, when the eccentric rotating shaft rotates in the shaft hole, it is continuously subjected to an eccentric force, thereby causing the bending section to bend and deform, and finally causing the rotating head to rotate.

[0060] In some optional embodiments, at least a part of the inner wall of the connecting rod is provided with a convex portion; when not bending, the convex portion is adjacent to or abuts against the outer wall of the bending section of the inner tube; when bending, the convex portion guides at least a part of the bending section to pass through the opening and penetrate the side wall and move in a direction away from the axis of the outer tube. As Figure 15 and 16 shown, the convex portion 107 is closer to the axis of the inner tube than other parts of the inner wall of the connecting rod. In this embodiment, the rotating shaft and the rotating shaft hole still exist, but neither the rotating shaft nor the rotating shaft hole is eccentric. When bending, the convex portion first contacts the bending section, so that the convex portion has a certain outward thrust on the outer wall of the inner tube, thereby causing the position of the bending section corresponding to the convex portion to bend and deform first, effectively controlling the deformation position of the distal end of the inner tube. This method is different from the aforementioned method of forcing the bending section to deform by an eccentric force, and it controls the deformation of the bending section through structural design. In addition, it should be noted that in the solution with a convex portion, the aforementioned eccentric hole or eccentric shaft solution can also be added so that the convex portion and the eccentric force act together on the bending section to promote its rapid bending and deformation.

[0061] In some embodiments, the connecting rod can adopt various forms. For example Figure 17 and Figure 18 The shown embodiments demonstrate some optional design schemes of the connecting rod. In practice, according to various factors such as actual manufacturing materials and deformation amounts, the size and form of the connecting rod can be appropriately adjusted. For example, when a relatively light connecting rod is required, some hollow structures can be provided thereon to improve the passing performance of the sheath in the blood vessel while also reducing its weight.

[0062] In some optional embodiments, it further includes a bending section. The bending section is arranged at the distal end of the connecting rod, and the bending section is connected to the rotating end head; when at least part of the inner tube moves axially relative to the axis of the outer tube, the bending section bends and deforms to drive the rotating end head to move, so that the rotating end head rotates relative to the distal section of the outer tube, and the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube. As Figures 19 to 21 In the shown embodiment, it demonstrates another optional scheme for fixing the distal ends of the inner tube and the outer tube. Among them, the distal ends of the inner tube and the outer tube are directly fixedly connected, and there is no relative rotational relationship between them. Specifically, the distal end of the connecting rod is connected with a bending section 2011, and the distal end of the bending section 2011 is directly connected to the rotating end head of the inner tube. The bending section has a lower stiffness, and under the action of an external force, it is more likely to bend and deform compared to other parts of the connecting rod. Therefore, when at least part of the inner tube moves axially relative to the axis of the outer tube, under the action of an external force, the rotating end head first moves to drive the bending section to deform, and then the rotating end head rotates relative to the distal section of the outer tube. During actual manufacturing, the bending section and the side wall of the connecting rod can be made by an integral molding process; or the bending section can be set as an independent component and then connected to the distal end of the connecting tube. In addition, the stiffness of the bending section can be made less than that of the connecting rod by reducing the circumferential dimension, wall thickness, etc. of the bending section.

[0063] The second aspect of the present invention provides an adjustable bending system. Specifically as Figure 2 shown, the adjustable bending system includes an operation part 105 and the bending sheath according to any one of the first aspect. The operation part is used to control at least part of the inner tube to move distally or proximally relative to the axis of the outer tube to adjust the rotation angle of the rotating end head. In practice, the operation part can be a handle structure. Both the inner tube and the outer tube are connected to the handle. The proximal end of the inner tube is connected to the adjustment mechanism inside the handle, and the outer tube is fixedly connected to the handle part, so as to drive the inner tube to move relative to the outer tube through the adjustment mechanism, and finally make the rotating end head rotate.

[0064] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the technical solutions disclosed in this application. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0065] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. An adjustable bending sheath, characterized in that: It includes: An outer tube and an inner tube, the inner tube is arranged inside the outer tube and extends along the axis direction of the outer tube; The inner tube includes a bending section and an inner tube main body section, the bending section is located at the distal end, and the inner tube main body section is located at the proximal end; The outer tube includes an outer tube distal section and an outer tube main body section, the outer tube distal section is located at the distal end, and the outer tube main body section is located at the proximal end; The inner tube further includes a rotating head, the rotating head is arranged at the distal end of the bending section and can rotate relative to the outer tube distal section, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube, and the rotation axis of the rotation movement is perpendicular to the bending plane of the bending section; At least part of the inner tube can move relative to the axis of the outer tube, and the movement drives the rotating head to generate the rotation movement; At least part of the side wall of the outer tube distal section includes an opening part, and at least part of the bending section of the inner tube penetrates through the side wall through the opening part and moves away from the outer tube distal section when bending.

2. The adjustable bending sheath according to claim 1, characterized in that The outer tube distal section includes a connecting rod, and the connecting rod is connected to the outer tube main body section; An opening is provided on the side wall of the connecting rod to form the opening part.

3. The adjustable bending sheath according to claim 2, characterized in that A rotating shaft hole is provided at the distal end of the connecting rod, and a rotating shaft is provided at the distal end of the bending section of the inner tube; The rotating shaft cooperates with the rotating shaft hole to guide the rotating head to rotate relative to the outer tube distal section.

4. The adjustable bending sheath according to claim 3, characterized in that The rotating shaft hole is an eccentric hole. When the inner tube moves distally relative to the outer tube, the rotating shaft is subjected to the eccentric force of the rotating shaft hole so that at least part of the bending section penetrates through the side wall through the opening part and moves away from the axis direction of the outer tube; or The axis of the rotating shaft is arranged offset from the axis of the inner tube. When the inner tube moves distally relative to the outer tube, the rotating shaft is subjected to the eccentric force of the rotating shaft hole so that at least part of the bending section penetrates through the side wall through the opening part and moves away from the axis of the outer tube.

5. The adjustable bending sheath according to claim 4, characterized in that At least part of the inner wall of the connecting rod is provided with a convex part; When not bending, the convex part is adjacent to or abuts against the outer wall of the bending section of the inner tube; When bending, the convex part guides at least part of the bending section to penetrate through the side wall through the opening part and move away from the axis of the outer tube.

6. The adjustable bending sheath according to claim 2, characterized in that It further includes a bending section, the bending section is arranged at the distal end of the connecting rod, and the bending section is connected to the rotating head; When at least part of the inner tube moves relative to the axis of the outer tube, the bending section is bent and deformed to drive the rotating head to move, so that the rotating head rotates relative to the outer tube distal section, and the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube.

7. The adjustable bending sheath according to claim 6, wherein the bending section is integrally formed with the side wall of the connecting rod, and the stiffness of the bending section is less than that of the connecting rod.

8. An adjustable bending system, characterized in that, It includes an operating part and the adjustable bending sheath according to any one of claims 1-7, and the operating part is used to control at least part of the inner tube to move distally or proximally relative to the axis of the outer tube so as to adjust the rotation angle of the rotating end.

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