Steerable catheter and medical device

Abstract

The application discloses a bend-adjustable catheter and medical equipment, which comprises an inner layer pipe, a bend-adjustable pipe sleeved outside the inner layer pipe, a first bend-adjustable pipe section and a second bend-adjustable pipe section arranged on the bend-adjustable pipe, a first hollow part and a first cutting part arranged in the circumferential direction of the first bend-adjustable pipe section, a second hollow part and a second cutting part arranged in the circumferential direction of the second bend-adjustable pipe section, an outer layer pipe sleeved outside the bend-adjustable pipe, a pull wire arranged between the inner layer pipe and the outer layer pipe, the pull wire being located at the first hollow part and the second hollow part in the circumferential direction, a first end of the pull wire being fixed to a distal end of the catheter, and a second end of the pull wire extending out of a proximal end of the catheter. The hollow part and the cutting part are arranged on different bend-adjustable pipe sections of the bend-adjustable pipe, and then the pull wire is driven to present different bending directions, so that the catheter is bent into a multi-bend mode, and the structure is simple and the operation is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and further relates to a bend-adjustable catheter and a medical device. BACKGROUND

[0002] Interventional surgery has the advantage of small trauma and is the development direction of medical devices, but the internal cavity of the human body is complex, and higher requirements are also placed on the shape of the catheter. For example, transcatheter aortic replacement surgery may cause the calcified fragments around the patient's aortic valve to fall off, and the fallen calcified fragments are easy to enter the cerebral blood vessels through the left common carotid artery or the brachiocephalic trunk artery. In order to prevent the calcified fragments from entering the brain, a cerebral protection device with a filter screen needs to be used.

[0003] This cerebral protection device can effectively prevent the calcified fragments from entering the brain, and an S-shaped bendable catheter needs to be used between the two filter screens of the cerebral protection device. The forward bending of the catheter is generally driven by a traction wire, and the distal end of the forward bending part is compressed by a metal sheet or a metal wire to compress the proximal end of the reverse bending part, so that different bending directions appear on different parts of the catheter. However, such a catheter structure is complex and has poor flexibility. SUMMARY

[0004] In view of the above technical problems, the purpose of the present application is to provide a bend-adjustable catheter and a medical device, which are simple in structure and convenient to operate by setting a hollow part and a cutting part on different bend-adjustable tube segments of the bend-adjustable tube, and then driving the pull wire to present different bending directions, so as to bend the catheter into a multi-bend shape.

[0005] In order to achieve the above-mentioned purpose, the present application provides a bend-adjustable catheter, comprising:

[0006] an inner layer tube;

[0007] a bend-adjustable tube, which is sleeved on the outer side of the inner layer tube, and is provided with a first bend-adjustable tube segment and a second bend-adjustable tube segment, the first bend-adjustable tube segment is provided with a first hollow part and a first cutting part in the circumferential direction, and the second bend-adjustable tube segment is provided with a second hollow part and a second cutting part in the circumferential direction;

[0008] an outer layer tube, which is sleeved on the outer side of the bend-adjustable tube, and the distal end of the bend-adjustable tube is fixed between the inner layer tube and the outer layer tube;

[0009] a pull wire, which is arranged between the inner layer tube and the outer layer tube, and the pull wire is located at the first hollow part and the second hollow part on the axis, the first end of the pull wire is fixed to the distal end of the catheter, and the second end of the pull wire extends out of the proximal end of the catheter, which is used to control the first bend-adjustable tube segment and the second bend-adjustable tube segment to present different bending directions.

[0010] In some embodiments, the first hollowed part comprises a plurality of first notches, the plurality of first notches being arranged along a length direction of the adjustable elbow pipe, the first cutting part comprises a plurality of first cutting slits, the plurality of first cutting slits being arranged along the length direction of the adjustable elbow pipe;

[0011] The second hollowed part comprises a plurality of second notches, the plurality of second notches being arranged along a length direction of the adjustable elbow pipe, the second cutting part comprises a plurality of second cutting slits, the plurality of second cutting slits being arranged along the length direction of the adjustable elbow pipe.

[0012] In some embodiments, a circumferential length of the first notch is greater than a circumferential length of the first cutting slit, and the first notch is arranged in a staggered manner with the first cutting slit;

[0013] A circumferential length of the second notch is greater than a circumferential length of the second cutting slit, and the second notch is arranged in a staggered manner with the second cutting slit.

[0014] In some embodiments, the first hollowed part and the second hollowed part are arranged in a staggered manner along a circumferential direction of the adjustable elbow pipe;

[0015] Alternatively, the first hollowed part and the second hollowed part are respectively located on two axial sides of the adjustable elbow pipe.

[0016] In some embodiments, a width of the plurality of first notches is equal, the plurality of first notches are arranged uniformly or non-uniformly along the length direction of the adjustable elbow pipe, and the plurality of first cutting slits are arranged uniformly or non-uniformly along the length direction of the adjustable elbow pipe;

[0017] A width of the plurality of second notches is equal, the plurality of second notches are arranged uniformly or non-uniformly along the length direction of the adjustable elbow pipe, and the plurality of second cutting slits are arranged uniformly or non-uniformly along the length direction of the adjustable elbow pipe.

[0018] In some embodiments, further comprising: a pull wire ring;

[0019] The pull wire ring is fixed between the inner layer pipe and the outer layer pipe and located at a distal end of the adjustable elbow pipe, the pull wire ring is arranged in a spaced manner or a connected manner with the adjustable elbow pipe;

[0020] A protective sleeve is sleeved on the pull wire, and a first end of the pull wire is fixed on the pull wire ring.

[0021] In some embodiments, one pull wire is arranged, a circumferential position of the pull wire remains unchanged, and the pull wire is located at the first hollowed part and the second hollowed part simultaneously in a circumferential direction;

[0022] Or, the pull wire is provided in one, the pull wire is arranged in a curved shape along the catheter, and the pull wire is located at the first hollow part and the second hollow part at the same time in the circumferential direction.

[0023] In some embodiments, further comprising: an auxiliary pull wire;

[0024] The distal end of the pull wire is fixed to the distal end of the first adjustable elbow segment, and part of the structure of the pull wire is located at the first hollow part in the circumferential direction; the distal end of the auxiliary pull wire is fixed to the distal end of the second adjustable elbow segment, and part of the structure of the auxiliary pull wire is located at the second hollow part in the circumferential direction; the proximal end of the pull wire and the proximal end of the auxiliary pull wire are integrated at the proximal end of the catheter and extend out of the proximal end of the catheter.

[0025] Or, the distal end of the pull wire is fixed to the distal end of the first adjustable elbow segment, and part of the structure of the pull wire is located at the first hollow part in the circumferential direction; the distal end of the auxiliary pull wire is fixed to the distal end of the second adjustable elbow segment, and part of the structure of the auxiliary pull wire is located at the second hollow part in the circumferential direction; the proximal end of the pull wire and the proximal end of the auxiliary pull wire extend out of the proximal end of the catheter respectively.

[0026] In some embodiments, the inner layer tube, the adjustable elbow, and the outer layer tube are arranged in sequence in close contact, a pull wire groove is arranged between the inner layer tube and the outer layer tube along the track of the pull wire, the space of the pull wire groove is greater than the outer diameter of the pull wire, and the pull wire is arranged in the pull wire groove, so that pulling the pull wire can drive the first adjustable elbow segment and the second adjustable elbow segment to bend in a preset direction.

[0027] Or, the adjustable elbow and the outer layer tube are arranged in close contact, the adjustable elbow and the inner layer tube are spaced apart by a preset distance to form a hollow structure, and the pull wire is arranged in the hollow structure, so that pulling the pull wire can drive the first adjustable elbow segment and the second adjustable elbow segment to bend in a preset direction.

[0028] According to another aspect of the present application, the present application further provides a medical instrument comprising the adjustable elbow catheter of any one of the above.

[0029] Compared with the prior art, the adjustable elbow catheter and the medical instrument provided by the present application have the following beneficial effects:

[0030] In the application, the conduit is bent into a multi-bend shape by setting the hollow parts and cutting parts in different adjustable elbow sections of the adjustable elbow, and then driving the pull wires to present different bending directions. By setting the relative positions of the hollow parts and the pull wires, one control mechanism can control one pull wire or two pull wires to complete multi-section and multi-angle bending control. Meanwhile, different adjustable elbow sections can present different bending directions, which can be located in one plane or different planes, and can present two bending sections or multiple bending sections. The conduit has a simple structure and convenient bending control operation. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above features, technical characteristics, advantages and implementation modes of the application will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0032] Figure 1 is a structure diagram of the conduit of the preferred embodiment of the application;

[0033] Figure 2 is a cross-sectional view of the conduit of the preferred embodiment of the application;

[0034] Figure 3 is a structure diagram of the conduit of another preferred embodiment of the application;

[0035] Figure 4 is a structure diagram of the conduit of another preferred embodiment of the application;

[0036] Figure 5 is a structure diagram of the conduit of another preferred embodiment of the application;

[0037] Figure 6 is a structure diagram of the conduit of another preferred embodiment of the application;

[0038] Figure 7 is a structure diagram of the conduit in a bent state of the preferred embodiment of the application;

[0039] Figure 8 is a structure diagram of the brain protection device in an application state of the preferred embodiment of the application.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] Inner layer tube 1, hollow structure 11, adjustable elbow 2, first adjustable elbow section 21, first hollow part 211, first notch 2111, first cutting part 212, first cutting seam 2121, second adjustable elbow section 22, second hollow part 221, second notch 2211, second cutting part 222, second cutting seam 2221, outer layer tube 3, pull wire 4, protective sleeve 41, auxiliary pull wire 42, pull wire ring 5, brain protection device 6, filter screen 61, conduit 62. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative effort, and other embodiments can also be obtained.

[0043] In order to make the drawings simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" situation.

[0044] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0045] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0047] In order to more clearly describe the structure of the present application, "distal" and "proximal" are used as directional words, where "distal" means the end far away from the operator during the operation, and "proximal" means the end close to the operator during the operation.

[0048] In actual application, such as trans-catheter aortic replacement surgery, calcified fragments around the aortic valve of the patient can be detached, and the detached calcified fragments can easily enter the cerebral blood vessels through the left common carotid artery or the brachiocephalic artery. In order to prevent the calcified fragments from entering the brain, a cerebral protection device with a filter screen is needed. Figure 8As shown, the brain protection device 6 can effectively prevent the calcified pieces from entering the brain, and a S-shaped curved conduit 62 is needed between the two filter screens 61. The positive bending of the conduit 62 is generally driven by a traction wire, and the positive bending part at the distal end of the conduit 62 compresses the reverse bending part at the proximal end through a metal sheet or wire, so that different bending directions appear on different parts of the conduit. However, the structure of such a conduit is complex and has poor flexibility.

[0049] To solve the above problems, with reference to the drawings attached to the specification Figures 1 to 3 The adjustable bending conduit provided by the present application comprises an inner layer tube 1, an adjustable bending tube 2, an outer layer tube 3 and a pull wire 4. The adjustable bending tube 2 is sleeved outside the inner layer tube 1, and the adjustable bending tube 2 is provided with a first adjustable bending tube segment 21 and a second adjustable bending tube segment 22. The first adjustable bending tube segment 21 is provided with a first hollow part 211 and a first cutting part 212 in the circumferential direction, and the second adjustable bending tube segment 22 is provided with a second hollow part 221 and a second cutting part 222 in the circumferential direction. The outer layer tube 3 is sleeved outside the adjustable bending tube 2, and the distal end of the adjustable bending tube 2 is fixed between the inner layer tube 1 and the outer layer tube 3. The pull wire 4 is arranged between the inner layer tube 1 and the outer layer tube 3, and the pull wire 4 is located at the first hollow part 211 and the second hollow part 221 in the circumferential direction. The first end of the pull wire 4 is fixed to the distal end of the conduit, and the second end of the pull wire 4 extends out of the proximal end of the conduit for controlling the first adjustable bending tube segment 21 and the second adjustable bending tube segment 22 to present different bending directions.

[0050] In this embodiment, the hollow part and the cutting part are arranged on different adjustable bending tube segments of the adjustable bending tube 2, and the pull wire 4 is driven to present different bending directions, so as to bend the conduit into a multi-bending shape. By setting the relative positions of the hollow part and the pull wire, multi-segment and multi-angle bending control can be achieved by using one pull wire. Meanwhile, different adjustable bending tube segments can present different bending directions, which can be located in one plane or different planes, and can present two bending segments or multiple bending segments. The conduit has a simple structure and convenient bending control operation.

[0051] In one embodiment, with reference to the drawings attached to the specification Figures 1 to 3 The first hollow part 211 comprises a plurality of first notches 2111, and the plurality of first notches 2111 are arranged at intervals in the length direction of the adjustable bending tube 2. The first cutting part 212 comprises a plurality of first cutting seams 2121, and the plurality of first cutting seams 2121 are arranged at intervals in the length direction of the adjustable bending tube 2. The second hollow part 221 comprises a plurality of second notches 2211, and the plurality of second notches 2211 are arranged at intervals in the length direction of the adjustable bending tube 2. The second cutting part 222 comprises a plurality of second cutting seams 2221, and the plurality of second cutting seams 2221 are arranged at intervals in the length direction of the adjustable bending tube 2.

[0052] Preferably, the circumferential length of the first notch 2111 is greater than that of the first cutting seam 2121, and the first notch 2111 is arranged in a staggered manner with the first cutting seam 2121; the circumferential length of the second notch 2211 is greater than that of the second cutting seam 2221, and the second notch 2211 is arranged in a staggered manner with the second cutting seam 2221; the first hollow part 211 and the second hollow part 221 are arranged in a staggered manner along the circumference of the adjustable elbow pipe 2; or the first hollow part 211 and the second hollow part 221 are respectively located on the two sides of the adjustable elbow pipe 2 in the axial direction. This structure can make the adjustable elbow pipe 2 more easily bent, reducing the difficulty of operation. Of course, the specific length of the notch and the cutting seam can be set according to actual needs, and the circumferential length of the notch can be set to be less than the circumferential length of the cutting seam; or the circumferential length of part of the notch is greater than that of part of the cutting seam, and the circumferential length of another part of the notch is greater than that of another part of the cutting seam, and they can be arranged in a staggered manner, so that adjacent notches and cutting seams partially overlap in the circumferential direction.

[0053] Further, the widths of the plurality of first notches 2111 are equal, the plurality of first notches 2111 are uniformly arranged or non-uniformly arranged along the length direction of the adjustable elbow pipe 2, and the plurality of first cutting seams 2121 are uniformly arranged or non-uniformly arranged along the length direction of the adjustable elbow pipe 2. The widths of the plurality of second notches 2211 are equal, the plurality of second notches 2211 are uniformly arranged or non-uniformly arranged along the length direction of the adjustable elbow pipe 2, and the plurality of second cutting seams 2221 are uniformly arranged or non-uniformly arranged along the length direction of the adjustable elbow pipe 2. By setting the width of the notch to be equal, not only can the deformation of the adjustable elbow pipe be more uniform, but also the processing difficulty can be reduced. Of course, according to different needs, the width of the notch can also be set to be different.

[0054] Further, the first adjustable elbow pipe segment 21 and the second adjustable elbow pipe segment 22 have a transition segment therebetween, and the length of the transition segment is used to define the axial distance between the two bending segments. By providing the transition segment, the adjustable elbow pipe 2 can have more bending shapes to be suitable for different application scenarios, thereby improving its application range.

[0055] In the embodiment, the adjustable elbow pipe 2 can be provided as a circular pipe, a part of the circular arc of the adjustable elbow pipe segment of the adjustable elbow pipe 2 is cut into a hollow part, the hollow part is distributed with uniform or non-uniform notches, the remaining circular arc part is a non-hollow part, the non-hollow part is distributed with uniform or non-uniform cutting seams, the cutting seams are arranged in a staggered manner with the deformation openings, and the pull wire is located within the range of the hollow part. When the pull wire 4 receives a pulling force, the gap of the notch under stress is reduced, the cutting seam of the non-hollow part is opened, and the adjustable elbow pipe segment bends towards the hollow part.

[0056] In one embodiment, reference is made to the drawings attached hereto Figures 1 to 7The adjustable bending catheter further comprises a pull wire ring 5, the pull wire ring 5 is fixed between the inner layer tube 1 and the outer layer tube 3 and is located at the distal end of the adjustable bending tube 2, and the pull wire ring 5 is arranged separately from or connected to the adjustable bending tube 2. A protective sleeve 41 is arranged on the pull wire 4, the protective sleeve 41 can be made of PTFE, and the first end of the pull wire 4 is fixed to the pull wire ring 5. By arranging the protective sleeve 41, the pull wire 4 can be protected, the service life of the pull wire 4 is improved, the friction of the pull wire 4 is reduced, and the operation convenience is improved.

[0057] In one embodiment, referring to the drawings attached to the specification Figure 3 , the pull wire 4 is arranged in one, the circumferential position of the pull wire 4 remains unchanged, and the pull wire 4 is circumferentially located at the first hollow part 211 and the second hollow part 221 at the same time; when the pull wire receives a pulling force, the first adjustable bending tube segment 21 and the second adjustable bending tube segment 22 present different bending directions.

[0058] In one embodiment, referring to the drawings attached to the specification Figure 4 , the pull wire 4 is arranged in one, the pull wire 4 is arranged in a curved shape along the catheter, the first hollow part 211 and the second hollow part 221 are arranged on the two sides of the adjustable bending tube 2 in the axial direction, and the pull wire 4 is circumferentially located at the first hollow part 211 and the second hollow part 221 at the same time; when the pull wire receives a pulling force, the first adjustable bending tube segment 21 and the second adjustable bending tube segment 22 present different bending directions.

[0059] In one embodiment, referring to the drawings attached to the specification Figure 5 , the adjustable bending catheter further comprises an auxiliary pull wire 42; the distal end of the pull wire 4 is fixed to the distal end of the first adjustable bending tube segment 21, and part of the structure of the pull wire 4 is circumferentially located at the first hollow part 211; the distal end of the auxiliary pull wire 42 is fixed to the distal end of the second adjustable bending tube segment 22, and part of the structure of the auxiliary pull wire 42 is circumferentially located at the second hollow part 221; the proximal end of the pull wire 4 and the proximal end of the auxiliary pull wire 42 are combined into one at the proximal end of the catheter and extend out of the proximal end of the catheter; the pull wire 4 and the auxiliary pull wire 42 can be connected by welding or mechanical connection.

[0060] In one embodiment, referring to the drawings attached to the specification Figure 6 , the adjustable bending catheter further comprises an auxiliary pull wire 42; the distal end of the pull wire 4 is fixed to the distal end of the first adjustable bending tube segment 21, and part of the structure of the pull wire 4 is circumferentially located at the first hollow part 211; the distal end of the auxiliary pull wire 42 is fixed to the distal end of the second adjustable bending tube segment 22, and part of the structure of the auxiliary pull wire 42 is circumferentially located at the second hollow part 221; the proximal end of the pull wire 4 and the proximal end of the auxiliary pull wire 42 are combined into one at the proximal end of the catheter and extend out of the proximal end of the catheter; the pull wire 4 and the auxiliary pull wire 42 can be connected by welding or mechanical connection.

[0061] In the above embodiments, the inner layer tube 1, the adjustable bend tube 2 and the outer layer tube 3 are sequentially and closely arranged, the pull wire slot is arranged between the inner layer tube 1 and the outer layer tube 3, the pull wire slot is arranged along the track of the pull wire 4, the space of the pull wire slot is greater than the outer diameter of the pull wire 4, and the pull wire 4 is arranged in the pull wire slot, so that pulling the pull wire 4 can drive the first adjustable bend tube segment 21 and the second adjustable bend tube segment 22 to bend in the preset direction. Alternatively, the adjustable bend tube 2 and the outer layer tube 3 are closely arranged, the adjustable bend tube 2 is spaced apart from the inner layer tube 1 by a preset distance to form the hollow structure 11, and the pull wire 4 is arranged in the hollow structure 11, so that pulling the pull wire 4 can drive the first adjustable bend tube segment 21 and the second adjustable bend tube segment 22 to bend in the preset direction.

[0062] In the above embodiments, the inner layer tube 1 is made of a high polymer material, has high lubricity and low friction, and has a smooth inner surface, which can ensure that the implanted instrument passes through the inner surface smoothly, and the material can be a high polymer material such as PTFE (polytetrafluoroethylene) and Pebax (nylon elastomer).

[0063] The adjustable bend tube 2 is a hard material tube, such as a metal tube, a non-metal tube with high hardness, etc. The adjustable bend tube 2 is preferably a stainless steel tube or a nickel-titanium material tube, and mainly functions as a support or framework of the catheter. When the adjustable bend tube segment of the adjustable bend tube 2 is bent, the entire catheter will present the same bending shape.

[0064] The inner layer tube 3 is made of a high polymer material, has high lubricity and low friction, and has a smooth outer surface, and the material can be a high polymer material such as PTFE (polytetrafluoroethylene) and Pebax (nylon elastomer).

[0065] The pull wire ring 5 can be a metal material, such as stainless steel, etc. The pull wire ring 5 is in the tube wall, is embedded in the high polymer tube wall by high polymer material fusion, and can be connected or welded with the adjustable bend tube 2, or can not be connected.

[0066] According to another aspect of the present application, the present application further provides a medical instrument comprising the adjustable bend catheter according to any one of the above embodiments.

[0067] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0068] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present application, and it should be noted that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered within the protection scope of the present application.

Claims

1. An adjustable-bend conduit, characterized in that, include: Inner tube; An adjustable bend is sleeved on the outside of the inner tube. The adjustable bend has a first adjustable bend section and a second adjustable bend section. The first adjustable bend section has a first hollow part and a first cut part along the circumference. The second adjustable bend section has a second hollow part and a second cut part along the circumference. The outer tube is sleeved on the outside of the adjustable bend, and the far end of the adjustable bend is fixed between the inner tube and the outer tube. A pull wire is disposed between the inner tube and the outer tube, and the pull wire is located at the first hollow part and the second hollow part in the circumferential direction. The first end of the pull wire is fixed to the distal end of the conduit, and the second end of the pull wire extends out of the proximal end of the conduit, for controlling the first adjustable bend section and the second adjustable bend section to present different bending directions. The pull wire is provided in one direction, and the circumferential position of the pull wire remains unchanged. The pull wire is located at both the first hollow part and the second hollow part in the circumferential direction. Alternatively, the pull wire is provided in a curved shape along the guide tube, and at least one segment of the pull wire is located at the first hollow part and at least one segment is located at the second hollow part in the circumferential direction.

2. The adjustable-bend conduit according to claim 1, characterized in that, The first hollowed-out portion includes a plurality of first slots, which are arranged at intervals along the length direction of the adjustable bend. The first cutting portion includes a plurality of first cutting slits, which are arranged at intervals along the length direction of the adjustable bend. The second hollowed-out portion includes a plurality of second slots, which are arranged at intervals along the length direction of the adjustable bend. The second cutting portion includes a plurality of second cutting slits, which are arranged at intervals along the length direction of the adjustable bend.

3. The adjustable-bend conduit according to claim 2, characterized in that, The circumferential length of the first slot is greater than the circumferential length of the first cutting seam, and the first slot and the first cutting seam are staggered. The circumferential length of the second groove is greater than the circumferential length of the second cutting seam, and the second groove and the second cutting seam are arranged in a staggered manner.

4. The adjustable-bend conduit according to claim 3, characterized in that, The first hollowed-out portion and the second hollowed-out portion are arranged in a staggered manner along the circumference of the adjustable bend. Alternatively, the first hollowed-out portion and the second hollowed-out portion are located on opposite sides of the axial direction of the adjustable bend.

5. The adjustable-bend conduit according to claim 4, characterized in that, The width of several first slots is equal, and the several first slots are evenly or non-uniformly arranged along the length direction of the adjustable bend. The several first cutting seams are evenly or non-uniformly arranged along the length direction of the adjustable bend. The width of several second slots is equal, and the several second slots are evenly or non-uniformly arranged along the length direction of the adjustable bend. The several second cutting seams are evenly or non-uniformly arranged along the length direction of the adjustable bend.

6. The adjustable-bend conduit according to any one of claims 1-5, characterized in that, Also includes: Pull ring; The pull ring is fixed between the inner tube and the outer tube and is located at the far end of the adjustable bend. The pull ring and the adjustable bend are spaced apart or connected. The first end of the pull wire is fixed to the pull ring.

7. The adjustable-bend conduit according to claim 6, characterized in that, Also includes: Auxiliary pull line; The distal end of the pull wire is fixed to the distal end of the first adjustable bend section. A portion of the pull wire's structure is located in the first hollowed-out portion in the circumferential direction. The distal end of the auxiliary pull wire is fixed to the distal end of the second adjustable bend section. A portion of the auxiliary pull wire's structure is located in the second hollowed-out portion in the circumferential direction. The proximal end of the pull wire and the proximal end of the auxiliary pull wire are integrated into the proximal end of the conduit and extend out of the proximal end of the conduit. Alternatively, the distal end of the pull wire is fixed to the distal end of the first adjustable bend section, and a portion of the pull wire's structure in the circumferential direction is located at the first hollow portion. The distal end of the auxiliary pull wire is fixed to the distal end of the second adjustable bend section, and a portion of the auxiliary pull wire's structure in the circumferential direction is located at the second hollow portion. The proximal ends of the pull wire and the auxiliary pull wire extend out of the proximal end of the conduit, respectively.

8. The adjustable-bend conduit according to claim 7, characterized in that, The inner tube, the adjustable bend tube, and the outer tube are arranged in close succession. A pull wire groove is provided between the inner tube and the outer tube. The pull wire groove is arranged along the trajectory of the pull wire. The space of the pull wire groove is larger than the outer diameter of the pull wire. The pull wire is disposed in the pull wire groove, so that pulling the pull wire can drive the first adjustable bend tube segment and the second adjustable bend tube segment to bend in a preset direction. Alternatively, the adjustable bend is disposed in close contact with the outer tube, and the adjustable bend is spaced apart from the inner tube by a preset distance to form a hollow structure. The pull wire is disposed within the hollow structure, so that pulling the pull wire can drive the first adjustable bend segment and the second adjustable bend segment to bend along a preset direction.

9. A medical device, characterized in that, Includes the adjustable conduit as described in any one of claims 1-8.

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