Bending-adjustable sheath and bending-adjustable system

Abstract

The invention provides an adjustable bending sheath which comprises an outer tube and an inner tube, and the inner tube is arranged in the outer tube and extends in the axis direction of the outer tube; the inner tube comprises a bending adjusting section and an inner tube main body section, the bending adjusting section is located at the far end, and the inner tube main body section is located at the near end; the outer tube comprises an outer tube far-end section and an outer tube main body section, the outer tube far-end section is located at the far end, and the outer tube main body section is located at the near end; the inner tube further comprises a rotating end, the rotating end is arranged at the far end of the bending adjusting section and can rotate relative to the far end section of the outer tube, and the rotating axis of the rotating motion is perpendicular to or approximately perpendicular to the axis of the outer tube. By optimizing the assembling relation of the rotating end, the bending adjusting radius of the bending adjusting sheath is reduced, and the rotating end can be accurately and quickly aligned to the target position.

Description

Technical Field

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

[0002] The bending sheath is a sheath assembly used in interventional and minimally invasive surgical procedures. It consists of a sheath (or outer sheath, outer tube, etc.) and a sheath core (or inner sheath, inner tube, etc.). The distal end of the sheath can be bent within a certain angle range by operating the handle. After the distal end of the sheath is bent, the tip of the sheath can be pointed to the target position, which is convenient for surgical operations on curved paths during surgery. However, in the prior art, the large bending radius of the bending sheath has always restricted medical devices from reaching the target position during surgery. In addition, in the prior art, the distal end of the sheath is guided to bend by a traction wire, and the sheath and the sheath core need to be bent synchronously, and the bending shapes of the two are basically the same. During the above-mentioned bending process, the traction wire has a large pulling force, and the anchor ring and the traction wire are easily broken, resulting in bending failure, which in turn causes operational risks and affects the safety of the surgery. Therefore, how to reduce the bending radius of the bending sheath or reduce the problems or risks caused by the traction wire is a problem that needs to be overcome urgently. Summary of the invention

[0003] In order to overcome at least one of the problems in the related art, the first aspect of the present invention provides an adjustable bending sheath. The adjustable bending sheath comprises: 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 comprises a bending adjustment section and an inner tube main body section, wherein the bending adjustment section is located at the distal end and the inner tube main body section is located at the proximal end; The outer tube comprises an outer tube distal section and an outer tube main section, wherein 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 head, which is arranged at the distal end of the bending section and can rotate relative to the distal end section of the outer tube, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube.

[0004] In some optional embodiments, at least a portion of the inner tube is movable relative to the axis of the outer tube, and the movement drives the rotating end to generate the rotational motion.

[0005] In some optional embodiments, at least part of the side wall of the distal section of the outer tube includes an open portion, and the bending section of the inner tube penetrates the side wall at least partly through the open portion during bending and moves in a direction away from the distal section of the outer tube.

[0006] In some optional embodiments, the outer tube distal end section includes a connecting rod, and the connecting rod is connected to the outer tube main body section; The side wall of the connecting rod is provided with an opening to form the open portion.

[0007] In some optional 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 adjustment section of the inner tube; The rotating shaft cooperates with the rotating shaft hole to guide the rotating end head to rotate relative to the distal end section of the outer tube.

[0008] In some optional embodiments, the shaft hole is an eccentric hole. When the inner tube moves toward the distal end relative to the outer tube, the shaft is subjected to an eccentric force from the shaft hole so that at least a portion of the bending section passes through the opening portion and penetrates the side wall and moves in a direction away from the axial direction of the outer tube; or The axis of the rotating shaft is set to deviate from the axis of the inner tube. If the inner tube moves toward the distal end 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 passes through the opening part and penetrates the side wall and moves in a direction away from the axis of the outer tube.

[0009] In some optional embodiments, at least a portion of the inner wall of the connecting rod is provided with a protrusion; When the bending is not being adjusted, the protrusion is close to or in contact with the outer wall of the bending section of the inner tube; During bending, the protrusion guides at least a portion of the bending section to pass through the opening portion, penetrate the side wall and move in a direction away from the axis of the outer tube.

[0010] Some optional embodiments further include a curved section, which is disposed at the distal end of the connecting rod and is connected to the rotating end head; When the inner tube at least partially moves relative to the axis of the outer tube, the bending section bends and deforms to drive the rotating end to move, so that the rotating end rotates relative to the distal end of the outer tube, and the rotation axis of the rotation is perpendicular or approximately perpendicular to the axis of the outer tube.

[0011] In some optional embodiments, the bending section is integrally formed with the side wall of the connecting rod, and the rigidity of the bending section is smaller than the rigidity of the connecting rod.

[0012] The second aspect of the present invention provides an adjustable bending system, which comprises an operating unit and any bending adjustment sheath described in the first aspect, wherein the operating unit is used to control at least a portion of the inner tube to move distally or proximally relative to the axis of the outer tube to adjust the rotational movement angle of the rotating end.

[0013] The technical solution of the present invention has the following advantages or beneficial effects: In some embodiments of the present invention, the assembly relationship of the rotating end is optimized so that it can rotate relative to the distal end section of the outer tube, and the rotation axis of the rotational movement is perpendicular or approximately perpendicular to the axis of the outer tube, thereby reducing the bending radius of the bending sheath and allowing the rotating end to accurately and quickly align with the target position.

[0014] In some embodiments of the present invention, the traction wire is abandoned, thereby effectively avoiding various problems caused by deformation of the traction wire guide sheath. After removing the traction wire, the embodiment drives the relative displacement relationship between the inner tube and the outer tube to drive the deformation of the distal end of the inner tube and the rotation of the rotating end, thereby effectively solving the problem of the driving force required for the rotation of the rotating end at the distal end of the inner tube.

[0015] In some embodiments of the present invention, an open portion is provided at the distal end of the outer tube, and the bending section passes through the outer tube after deformation, so that the deformation of the main body of the bending section occurs outside the outer wall of the outer tube, and is fully extruded and deformed, so that the rotating end can rotate at a large angle. Since only the deformation amount of the inner tube bending section needs to be controlled to control the rotation state of the rotating end, the problem of the prior art that the inner tube and the outer tube need to bend synchronously through a traction line to align the distal end of the sheath tube with the target target is avoided, the bending radius of the sheath tube is effectively reduced, so that the distal end of the sheath tube can be flexibly and quickly aligned with the target target, and the application range of the instrument is improved.

[0016] Some embodiments of the present invention solve the problem of connecting the inner tube and the outer tube by providing an independent connecting rod, providing an open portion on the connecting rod, and fixing the distal end of the connecting rod to the distal end of the inner tube, thereby reducing the manufacturing cost and improving the applicability and reliability of the bending sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention. Figure 1 is a partially enlarged schematic diagram of a first example of an adjustable bending sheath according to an embodiment of the present invention; Figure 2 is a schematic diagram of a first exemplary adjustable bend system according to an embodiment of the present invention; Figure 3 is a partially enlarged schematic diagram of an inner tube of a first example of an adjustable bending sheath according to an embodiment of the present invention; Figure 4 yes Figure 3 A partial enlarged schematic diagram of the cross section at AA in the middle; Figure 5 is a schematic diagram of an outer tube of a first exemplary adjustable bending sheath according to an embodiment of the present invention; Figure 6is a partially enlarged schematic diagram of an outer tube of a first example adjustable bending sheath according to an embodiment of the present invention; Figure 7 yes Figure 6 An enlarged schematic diagram of the ends of the middle and outer tubes; Figure 8 is a schematic diagram of the cooperation between the distal ends of the outer tube and the inner tube of a first example of an adjustable bending sheath according to an embodiment of the present invention; Fig. 9 is a partial enlarged schematic diagram of the first example of an adjustable bending sheath after bending according to an embodiment of the present invention; Fig.10 is a partial enlarged schematic diagram of the distal end of the first example of an adjustable bending sheath after bending according to an embodiment of the present invention; Fig.11 yes Fig. 9 A partial enlarged schematic diagram of the cross section at the middle BB position; Fig.12 is a partially enlarged schematic diagram of an inner tube of a second example adjustable bending sheath according to an embodiment of the present invention; Fig.13 is a partially enlarged schematic diagram of the distal end of an outer tube of a second example adjustable bending sheath according to an embodiment of the present invention; Fig.14 is a partial enlarged schematic diagram of the distal end of the second example of an adjustable bending sheath after bending according to an embodiment of the present invention; Fig.15 is a partially enlarged schematic diagram of an outer tube of an adjustable bending sheath according to a third example of an embodiment of the present invention; Fig.16 yes Fig.15 A partial enlarged schematic diagram of the distal end of the middle and outer tubes; Fig.17 is a schematic diagram of a connecting rod according to an embodiment of the present invention; Fig.18 is another schematic diagram of a connecting rod according to an embodiment of the present invention; Fig.19 is a partial enlarged schematic diagram of the fourth example of an adjustable bending sheath after bending according to an embodiment of the present invention; Fig. 20 is a partial enlarged schematic diagram of the distal end of the fourth example of an adjustable bending sheath after bending according to an embodiment of the present invention; Fig.21 Schematic diagram of a connecting rod in a fourth example adjustable bending sheath according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0019] 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 of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, third, etc. may be used in the present application to describe various information, these 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 the present 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 "at the time of" or "when" or "in response to determining".

[0021] 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.

[0022] like Figure 1 , Figure 2 and 19As 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 Fig. 9 or Fig.19 As shown, the inner tube includes a bending section (see Fig. 9 or Fig.19 The inner tube distal end bendable portion) and the inner tube main body section (see Fig. 9 or Fig.19 In the embodiment of the present invention, the portion other than 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 also includes a rotating end 102, the rotating end 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 rotational movement is perpendicular or approximately perpendicular to the axis of the outer tube. In practice, when the bending sheath is in use, its distal end will more or less deflect and deform in space, resulting in the rotation axis of the rotating end and the axis of the outer tube not being absolutely perpendicular under some working conditions. In fact, the two axes may be perpendicular or approximately perpendicular. The so-called approximately perpendicular includes that the angle between the two axes deviates by ±15° compared to 90°. When the control accuracy requirement is high, the deviation standard can be increased and reduced to ±10° or even ±5°. However, this places high demands on the selection of the manufacturing material of the sheath, operation control and other indicators. As Fig. 9As shown, the rotation axis of the rotating end 102 is different from the axis of the inner tube or the outer tube, and is perpendicular to the paper direction; while the axis of the outer tube or the inner tube is parallel to the paper direction. Therefore, when the rotating end rotates, it does not rotate along the axis of the inner tube or the outer tube, but rotates in a direction perpendicular to the paper, so that the distal end face of the rotating end quickly turns to 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 point 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 be rotated relative to the distal end section of the outer tube, and the rotation axis of the rotational movement is perpendicular or approximately perpendicular to the axis of the outer tube, so that the bending radius of the bending sheath is reduced, so that the rotating end can accurately and quickly align with the target point position.

[0023] In some optional embodiments, at least part of the inner tube can move relative to the axis of the outer tube, and the movement drives the rotating end to produce the rotating motion. Compared with the prior art, some embodiments of the present invention completely remove the traction wire, and how to manipulate the rotating end to rotate the rod becomes an urgent problem to be solved. Fig. 9 and 19 As 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 end of the inner tube and the distal end of the outer tube are fixedly connected, there is no displacement or only a small displacement between the two, and the main movement between the two is relative rotation. The rotation makes the normal of the end face of the rotating end rotate parallel to the axis direction of the outer tube to deviate from the axis. To achieve this rotation, in some embodiments, the inner tube can at least partially move relative to the axis of the outer tube. As explained above, the distal end of the inner tube is relatively fixed with the distal end of the outer tube, and when the inner tube moves relative to the outer tube, it is bound to cause local torsional deformation of the inner tube, thereby causing the rotating end of the inner tube to rotate. It can be seen that the traction wire is abandoned in this embodiment of the present invention, thereby effectively avoiding various problems caused by the traction wire. After removing the traction wire, the relative displacement relationship between the inner tube and the outer tube is driven in this embodiment, thereby effectively solving the problem of the driving force required for the rotation of the rotating end at the distal end of the inner tube.

[0024] In some optional embodiments, at least part of the side wall of the distal end section of the outer tube includes an open portion, and the bending adjustment section of the inner tube at least partly penetrates the side wall through the open portion and moves in a direction away from the distal end section of the outer tube during bending. In some embodiments, the diameters of the inner tube and the outer tube are relatively small. When the inner tube is relatively displaced inside the outer tube to drive the movement of the rotating end, the bending adjustment section of the inner tube will be constrained by the inner wall of the outer tube, making it unable to fully deform, thereby affecting the movement of the rotating end and unable to effectively align with the target. To this end, in some embodiments, at least part of the side wall of the distal end section of the outer tube includes an open portion. Exemplarily, the open portion can be a through hole provided on the outer wall of the outer tube. When the bending adjustment is performed, the bending adjustment section of the inner tube at least partly penetrates the side wall through the open portion and moves in a direction away from the distal end section of the outer tube. Fig. 9 As shown, due to the existence of the open portion, the bending section passes through the outer tube after deformation, so that the main body deformation part occurs outside the outer wall of the outer tube, and the bending section is fully squeezed and deformed, so that the rotating end can rotate at a large angle.

[0025] In some optional embodiments, the distal end section of the outer tube includes a connecting rod 1041, and the connecting rod is connected to the main section of the outer tube; the side wall of the connecting rod is provided with an opening to form the open portion. In practice, directly setting the open portion on the tube body of the outer tube and then fixing the distal ends of the outer tube and the inner tube will cause some manufacturing difficulties, which will lead to excessively high production costs. To this end, some embodiments of the present invention solve the problem of connecting the inner tube and the outer tube by providing an independent connecting rod, providing an open portion on the connecting rod, and fixing the distal end of the connecting rod to the distal end of the inner 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. Fig. 9 As shown, when the stiffness of the connecting rod meets the deformation requirements during the interventional process, its stiffness can be appropriately greater than that of the inner tube, so that when the inner tube moves toward the distal end, the inner tube bending portion bends and deforms, while the connecting rod basically does not deform, so as to effectively control the rotation angle of the rotating end.

[0026] In some optional embodiments, the distal end of the connecting rod is provided with a rotating shaft hole, and the distal end of the bending adjustment section of the inner tube is provided with a rotating shaft 101; the rotating shaft cooperates with the rotating shaft hole to guide the rotating end head to rotate relative to the distal end section of the outer tube. Figures 1 to 4 , Figure 4 It is shown that any section AA of the inner tube is a hollow structure, and a rotating shaft 101 is arranged at the far end of the bending section of the inner tube. There are two rotating shafts, which are symmetrically arranged on both sides of the inner tube. Figures 5 to 8As shown, the distal end of the connecting rod is provided with a shaft hole to cooperate with the shaft. When the shaft is fitted with the shaft hole, the rotating end of the inner tube can swing relative to the connecting rod. It is understandable that the positions of the shaft and the shaft hole can be reversed, that is, the shaft is provided on the connecting rod, and the shaft hole is provided at the distal end of the bending section. This embodiment only shows a way in which the inner tube and the outer tube are relatively fixed at the distal end. In practice, this relative setting can also be adopted in other ways.

[0027] In some optional embodiments, the shaft hole is an eccentric hole. When the inner tube moves toward the distal end relative to the outer tube, the shaft is subjected to the eccentric force of the shaft hole so that at least a portion of the bending section passes through the opening to penetrate the side wall and moves in a direction away from the axial direction of the outer tube; or, the axis of the shaft is set to deviate from the axis of the inner tube. When the inner tube moves toward the distal end relative to the outer tube, the shaft is subjected to the eccentric force of the shaft hole so that at least a portion of the bending section passes through the opening to penetrate the side wall and moves in a direction away from the axial direction of the outer tube. Figures 6 to 11 In the embodiment shown, the 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. It should be noted that the eccentricity is the distance between the center of the eccentric hole and the axis of the shaft. Figure 7 and 8 As shown in FIG. 1 , 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. Figure 8 In the initial assembly state shown, when the inner tube is not subjected to external force, the axis of the rotating shaft intersects with the axis of the outer tube. When the inner tube is subjected to external force so that part of the outer tube moves toward the distal end relative to the outer tube, the rotating shaft will abut against the inner wall of the eccentric hole and move, and the rotating shaft moves toward the center of the eccentric hole. During the movement, the eccentric force generated by the eccentric hole will continuously act, and the eccentric force will push the curved section of the inner tube to bulge upward, and gradually separate from the connecting rod and pass through the open part of the connecting rod. Correspondingly, the rotating end also rotates accordingly. Fig.10 The figure shows the schematic diagram of the shaft moving to a steady state in the eccentric hole. Fig.11 As shown in the figure, it shows the maximum radial dimension R of the distal end of the bending sheath. Since the present invention only needs to control the deformation of the inner tube bending section to control the rotation state of the rotating end, the problem of the prior art that the inner tube and the outer tube need to bend synchronously through a traction line to align the distal end of the sheath tube with the target point is avoided, thereby effectively reducing the bending radius of the sheath tube, allowing the distal end of the sheath tube to flexibly and quickly align with the target point, and improving the scope of application of the instrument. In other embodiments, such as Figures 12 to 14As shown, the shaft hole is set in a non-eccentric manner, while the shaft is set eccentrically. The axis of the shaft deviates from the axis of the inner tube by a distance F. 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. Similar to the above-mentioned eccentric hole solution, when the eccentric shaft rotates in the shaft hole, it is continuously subjected to eccentric force, which causes the bending section to bend and deform, and finally causes the rotating end to rotate.

[0028] In some optional embodiments, at least part of the inner wall of the connecting rod is provided with a protrusion; when not in bending, the protrusion is close to or abuts against the outer wall of the bending section of the inner tube; when in bending, the protrusion guides at least part of the bending section to pass through the opening portion, penetrate the side wall and move in a direction away from the axis of the outer tube. Fig.15 and 16 As shown, the protrusion 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 there is no eccentricity in the rotating shaft and the rotating shaft hole. When adjusting the bend, the protrusion first contacts the bending section, so that the protrusion has a certain outward thrust on the outer wall of the inner tube, so that the position of the bending section corresponding to the protrusion first bends and deforms, thereby effectively controlling the deformation position of the far end of the inner tube. This method is different from the aforementioned scheme of using eccentric force to force the bending section to deform, and it controls the deformation of the bending section through structural design. In addition, it should be noted that in the scheme of setting the protrusion, the eccentric hole or eccentric shaft scheme described above can also be additionally provided, so that the protrusion and the eccentric force act together on the bending section to cause it to bend and deform quickly.

[0029] In some embodiments, the connecting rod may be in various forms, for example Fig.17 and Fig.18 The embodiment shown shows some optional connecting rod design solutions. In practice, the size and shape of the connecting rod can be appropriately adjusted according to various factors such as the actual manufacturing material and deformation amount. For example, when a lighter connecting rod is required, some hollow structures can be set on it to improve the passability of the sheath in the blood vessel while reducing its weight.

[0030] Some optional embodiments further include a bending section, which is disposed at the distal end of the connecting rod and is connected to the rotating end head; when the inner tube at least partially moves 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 end section of the outer tube, and the rotation axis of the rotation motion is perpendicular or approximately perpendicular to the axis of the outer tube. Figures 19 to 21In the embodiment shown, another optional solution for fixing the distal ends of the inner tube and the outer tube is shown. The distal ends of the inner tube and the outer tube are directly fixedly connected, and there is no relative rotation relationship between the two. Specifically, the distal end of the connecting rod is connected with a curved section 2011, and the distal end of the curved section 2011 is directly connected to the rotating end of the inner tube. The rigidity of the curved section is relatively low, and under the action of external force, it is more likely to bend and deform than other parts of the connecting rod. Therefore, when the inner tube at least partially moves relative to the axis of the outer tube, the rotating end first moves under the action of external force and drives the curved section to deform, and then the rotating end rotates relative to the distal end of the outer tube. In actual manufacturing, the curved section and the side wall of the connecting rod can be made by an integrated molding process; or the curved section can be provided with an independent component and then connected to the distal end of the connecting tube. In addition, the rigidity of the curved section can be made smaller than the rigidity of the connecting rod by reducing the circumferential size and wall thickness of the curved section.

[0031] A second aspect of the present invention provides an adjustable bending system. Figure 2 As shown, the adjustable bending system includes an operating part 105 and any of the bending adjustment sheaths described in the first aspect, and the operating part is used to control at least a portion of the inner tube to move distally or proximally relative to the axis of the outer tube to adjust the rotational movement angle of the rotating terminal. In practice, the operating part can be a handle structure. The inner tube and the outer tube are both connected to the handle. The proximal end of the inner tube is connected to the adjustment mechanism in the handle, and the outer tube is fixedly connected to the handle part, so that the inner tube is driven to move relative to the outer tube through the adjustment mechanism, and finally the rotating terminal is rotated.

[0032] The above specific implementation methods do not constitute a limitation on the scope of protection of the present invention. After considering the specification and practicing the technical solutions disclosed in this application, those skilled in the art will easily think of other implementation methods of the present disclosure. This application is intended to cover any modification, use or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the technical field that are not disclosed in this disclosure. The description and examples are regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0033] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An adjustable bending sheath, characterized in that: include: 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 comprises a bending adjustment section and an inner tube main body section, wherein the bending adjustment section is located at the distal end and the inner tube main body section is located at the proximal end; The outer tube comprises an outer tube distal section and an outer tube main section, wherein 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 head, which is arranged at the distal end of the bending section and can rotate relative to the distal end section of the outer tube, wherein the rotation axis of the rotation movement is perpendicular or approximately perpendicular to the axis of the outer tube.

2. The adjustable bending sheath according to claim 1, characterized in that: At least a portion of the inner tube is movable relative to the axis of the outer tube, and the movement drives the rotating end head to generate the rotating motion.

3. The adjustable bending sheath according to claim 1 or 2, characterized in that: At least part of the side wall of the outer tube distal end section includes an open portion, and the bending section of the inner tube penetrates the side wall at least partly through the open portion during bending and moves in a direction away from the outer tube distal end section.

4. The adjustable bending sheath according to claim 3, characterized in that: The outer tube distal end section includes a connecting rod, and the connecting rod is connected to the outer tube main body section; The side wall of the connecting rod is provided with an opening to form the open portion.

5. The adjustable bending sheath according to claim 4, characterized in that: The distal end of the connecting rod is provided with a rotating shaft hole, and the distal end of the bending adjustment section of the inner tube is provided with a rotating shaft; The rotating shaft cooperates with the rotating shaft hole to guide the rotating end head to rotate relative to the distal end section of the outer tube.

6. The adjustable bending sheath according to claim 5, characterized in that: The shaft hole is an eccentric hole. When the inner tube moves toward the distal end relative to the outer tube, the shaft is subjected to the eccentric force of the shaft hole so that at least part of the bending section passes through the opening portion, penetrates the side wall and moves in a direction away from the axial direction of the outer tube; or The axis of the rotating shaft is set to deviate from the axis of the inner tube. If the inner tube moves toward the distal end 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 passes through the opening part and penetrates the side wall and moves in a direction away from the axis of the outer tube.

7. The adjustable bending sheath according to claim 5, characterized in that: At least a portion of the inner wall of the connecting rod is provided with a protrusion; When the bending is not being adjusted, the protrusion is close to or in contact with the outer wall of the bending section of the inner tube; During bending, the protrusion guides at least a portion of the bending section to pass through the opening portion, penetrate the side wall and move in a direction away from the axis of the outer tube.

8. The adjustable bending sheath according to claim 4, characterized in that: It also includes a curved section, which is arranged at the distal end of the connecting rod and is connected to the rotating end head; When the inner tube at least partially moves relative to the axis of the outer tube, the bending section bends and deforms to drive the rotating end to move, so that the rotating end rotates relative to the distal end of the outer tube, and the rotation axis of the rotation is perpendicular or approximately perpendicular to the axis of the outer tube.

9. The adjustable bending sheath according to claim 8, characterized in that: The bending section is integrally formed with the side wall of the connecting rod, and the rigidity of the bending section is smaller than the rigidity of the connecting rod.

10. An adjustable bending system, characterized in that: It comprises an operating part and the adjustable bending sheath as described in any one of claims 1-9, wherein the operating part is used to control at least a part of the inner tube to move distally or proximally relative to the axis of the outer tube to adjust the rotational movement angle of the rotating end.

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