Adjustable deflectable sheath

Abstract

The present invention discloses an adjustable bending sheath tube. The adjustable bending sheath tube includes a distal tube body and a main tube body. A spaced first accommodation cavity and a first traction wire cavity are provided in the distal tube body, and the first accommodation cavity axially penetrates the distal tube body; the main tube body is connected to the proximal end of the distal tube body, and a second accommodation cavity axially penetrating the main tube body is provided in the main tube body, and an inner diameter channel is provided in the second accommodation cavity; a traction wire, the part of the traction wire located in the distal tube body is movably threaded through the first traction wire cavity, and the part of the traction wire located in the main tube body is movably threaded through the inner diameter channel; wherein, both the first accommodation cavity and the first traction wire cavity are communicated with the second accommodation cavity, and the inner diameter of the first accommodation cavity is smaller than the inner diameter of the second accommodation cavity, so that the traction wire is suspended in the main tube body. According to the adjustable bending sheath tube of the present invention, the traction wire in the main tube body is suspended, and the main tube body is hardly stressed, thereby avoiding the "humpback" phenomenon of the adjustable bending sheath tube.

Description

Technical Field

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

[0002] With the continuous development of interventional therapy, adjustable bending sheath tubes with various structures are widely used in clinical diagnosis or treatment. By adjusting the distal bending angle of the adjustable bending delivery sheath tube, drugs or devices for treatment can be accurately delivered to the lesion location.

[0003] In the existing adjustable bending sheath tube, a traction wire cavity is usually axially arranged inside the tube wall of the tube body, and a traction wire integrally accommodated in the traction wire cavity. The distal end of the traction wire is fixed to the distal end of the tube body, and the proximal end of the traction wire is connected to the handle at the proximal end of the tube body. The operator operates the handle to pull the traction wire and drive the tube body at the distal end of the sheath tube to bend to different angles, realizing the "adjustable bending" function of the tube body. However, during the bending process of this adjustable bending sheath tube, since the traction wire cavity is continuously installed and laid on one inner wall side of the sheath tube body, when the traction wire is pulled, the traction wire cavity is affected by the force of the traction wire, which will generate pressure on the tube wall and force the tube body to bend, resulting in the bending of the tube body section where the traction wire cavity is accommodated, and thus the entire tube body will show a "humpback" phenomenon, that is, the entire tube body is not straight and will present different degrees of bending, as Figure 1 shown, which will seriously affect the normal use of the adjustable bending catheter and the surgical process.

[0004] To address this problem, the prior art also discloses an adjustable bending sheath tube with gradually increasing hardness from the distal end to the proximal end of the tube body. The higher-hardness proximal tube body resists this bending, but this will cause the acting force to accumulate on the side of the tube body where the traction wire is laid. Moreover, since the cross-section of the sheath tube wall is not completely regular and there are parts with uneven thickness, it is easy to interfere with the pulling of the traction wire. Eventually, the force received by the traction wire in the circumferential direction is anisotropic. Therefore, when the operator twists the proximal tube body, the entire tube body cannot be twisted synchronously, which not only fails to improve the "humpback" phenomenon of the tube body well but also causes the pulling force to be lost in the tube body, reducing the sensitivity during the bending process. Summary of the Invention

[0005] In order to solve the technical problems existing in the prior art, the present invention provides an adjustable bending sheath tube, which includes:

[0006] A distal tube body and a main tube body. The distal tube body is provided with spaced first accommodation cavities and a first traction wire cavity. The first accommodation cavity axially penetrates the distal tube body. The main tube body is connected to the proximal end of the distal tube body. The main tube body is provided with a second accommodation cavity axially penetrating the main tube body, and an inner diameter channel is arranged in the second accommodation cavity;

[0007] The traction wire, the part of the traction wire located in the distal tube body is movably threaded through the first traction wire cavity, and the part of the traction wire located in the main body tube body is movably threaded through the inner diameter channel;

[0008] Wherein, both the first accommodation cavity and the first traction wire cavity communicate with the second accommodation cavity, and the inner diameter of the first accommodation cavity is smaller than the inner diameter of the second accommodation cavity, so that the traction wire is suspended inside the main body tube body.

[0009] Compared with the prior art, for an adjustable bending sheath tube provided by the present invention, the traction wire inside the main body tube body is suspended and not integrated with the main body tube body. When the distal tube body is controlled to bend through the traction wire, the acting force will not be transmitted and press on the main body tube body, and the main body tube body is hardly stressed, so that the main body tube body remains straight and has better anti-bending performance, avoiding the "humpback" phenomenon of the adjustable bending sheath tube; at the same time, since the main body tube body does not need to be gradually hardened, the loss of traction force can be avoided, and the sensitivity of the bending process can be improved.

[0010] The additional aspects and advantages of the present invention will be given in the following description, and the additional aspects and advantages will become obvious from the following description or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments in line with the present invention, and are used together with the specification to explain the principles of the present invention.

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 Shows the "humpback" phenomenon of the adjustable bending sheath tube in the prior art;

[0014] Figure 2 Shows the three-dimensional view of the adjustable bending sheath tube in some embodiments of the present invention;

[0015] Figure 3 is Figure 2 The enlarged view at D in;

[0016] Figure 4 Shows the schematic diagram of the adjustable bending sheath tube in some embodiments of the present invention in the bending state;

[0017] Figure 5 Shows the three-dimensional perspective view of the adjustable bending sheath tube in some embodiments of the present invention;

[0018] Figure 6Shows a cross-sectional view of the steerable sheath tube according to some embodiments of the present invention;

[0019] Figure 7 Shows an exploded schematic view of the steerable sheath tube according to some embodiments of the present invention;

[0020] Figure 8 Shows a perspective view of the steerable sheath tube according to some embodiments of the present invention;

[0021] Figure 9 Is Figure 8 The cross-sectional view at A-A in

[0022] Figure 10 Is Figure 8 The cross-sectional view at B-B in

[0023] Figure 11 Shows an overall exploded view of the steerable sheath tube according to some embodiments of the present invention;

[0024] Figure 12 Shows a structural schematic view of the steerable sheath tube according to some embodiments of the present invention;

[0025] Figure 13 Shows a structural schematic view of the channel tube, the first positioning ring and the second positioning ring of the steerable sheath tube according to some embodiments of the present invention;

[0026] Figure 14 Shows a structural schematic view of the inner liner tube, the channel tube, the first positioning ring and the second positioning ring of the steerable sheath tube according to some embodiments of the present invention;

[0027] Figure 15 Is Figure 14 The enlarged view at E in

[0028] Figure 16 Shows an exploded view of the steerable sheath tube according to some embodiments of the present invention. Detailed implementation manners

[0029] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0033] As Figures 2 - 3 shown, the adjustable bending sheath tube 1 of certain embodiments of the present invention includes a distal tube body 10, a main tube body 20, and a traction wire 30. Optionally, the adjustable bending sheath tube 1 includes a handle assembly. The proximal end of the main tube body 20 is connected to the handle assembly, and the operator can remotely control the bending, twisting, axial movement, etc. of the adjustable bending sheath tube 1 outside the patient's body by operating the handle assembly.

[0034] As Figure 4 shown, in certain embodiments, the adjustable bending sheath tube 1 further includes a proximal tube body 40, and the proximal end of the proximal tube body 40 is connected to the handle assembly. The operator remotely controls the bending, twisting, axial movement, etc. of the adjustable bending sheath tube 1 outside the patient's body by operating the handle assembly.

[0035] Specifically, in combination with Figures 5 - 10As shown in the figure, an intermediate first accommodation cavity 11 and a first traction wire cavity 12 are provided in the distal tube body 10 at intervals. The first accommodation cavity 11 axially penetrates through the distal tube body 10; the main tube body 20 is connected to the proximal end of the distal tube body 10. A second accommodation cavity 21 axially penetrating through the main tube body 20 is provided in the tube body 23 of the main tube body 20, and an inner diameter channel 22 is provided in the second accommodation cavity 21; the part of the traction wire 30 located in the distal tube body 10 is movably threaded through the first traction wire cavity 12, and the part of the traction wire 30 located in the main tube body 20 is movably threaded through the inner diameter channel 22; wherein, both the first accommodation cavity 11 and the first traction wire cavity 12 communicate with the second accommodation cavity 21, and the inner diameter of the first accommodation cavity 11 is smaller than the inner diameter of the second accommodation cavity 21, so that the traction wire 30 is suspended in the main tube body 20.

[0036] The distal tube body 10 has a relatively high flexibility and can be bent, which is beneficial for bending adjustment; the main tube body 20 has a relatively high hardness and is generally in a straight state, so it has strong support. The distal end of the traction wire 30 is fixedly connected to the distal tube body 10 and extends in the first traction wire cavity 12. The traction wire 30 is used to adjust the bending of the distal tube body 10 in different directions.

[0037] Since the part of the traction wire 30 located in the main tube body 20 is movably threaded through the inner diameter channel 22, the inner diameter channel 22 plays a role in guiding and limiting the traction wire 30, so that the traction wire 30 threaded in the main tube body 20 is suspended, that is, the traction wire 30 is separated from the main tube body 20, and the traction wire 30 is suspended in the main tube body 20. When the traction wire 30 pulls the distal tube body 10, the acting force will not be transmitted and pressed on the main tube body 20, and the main tube body 20 is hardly stressed, thereby improving the anti-bending performance of the main tube body 20 and avoiding the "humpback" phenomenon of the tube body of the adjustable bending sheath 1.

[0038] In addition, when the operator twists the proximal end of the adjustable bending sheath 1, the pulling force of the traction wire 30 is mainly transmitted to the distal tube body 10, and the pulling force of the traction wire 30 will not be lost in the main tube body 20. The entire main tube body 20 can be smoothly twisted synchronously, thereby improving the bending adjustment sensitivity of the distal tube body 10, so that the adjustable bending sheath 1 can be applied to blood vessels with a larger bending angle, such as the aortic arch.

[0039] The first receiving cavity 11 and the second receiving cavity 21 are used for the intervention instrument to pass through. Optionally, the difference between the inner diameter of the first receiving cavity 11 and the inner diameter of the second receiving cavity 21 is greater than the wire diameter of the traction wire 30, so as to prevent the traction wire 30 from being squeezed in the inner diameter channel 22, enabling it to slide freely and avoiding the cutting effect on the traction wire 30; the difference between the inner diameter of the first receiving cavity 11 and the inner diameter of the second receiving cavity 21 is less than or equal to 2 times the wire diameter of the traction wire 30, so as to limit and guide the traction wire 30 at the step formed by this inner diameter difference, avoiding the influence of the too large movable space of the traction wire 30 on the torque transmission of the main body tube 20 and improving the bending adjustment efficiency of the distal tube 10.

[0040] Optionally, the bendable sheath 1 further includes a fixing ring 63, the fixing ring 63 is embedded in the tube wall of the distal tube 10, and the distal end of the traction wire 30 is fixedly connected to the fixing ring 63 by welding, fusing, bonding or other means, so as to drive the distal tube 10 to bend in different directions by controlling the traction wire 30 to pull the fixing ring 63.

[0041] Optionally, the proximal tube 40 is connected to the proximal end of the main body tube 20. The proximal tube 40 is provided with a spaced third receiving cavity 41 and a second traction wire cavity 42. The third receiving cavity 41 axially penetrates the proximal tube 40, and the part of the traction wire 30 located in the proximal tube 40 is movably disposed in the second traction wire cavity 42. Among them, both the third receiving cavity 41 and the second traction wire cavity 42 communicate with the second receiving cavity 21, and the inner diameter of the third receiving cavity 41 is smaller than the inner diameter of the second receiving cavity 21, so that the traction wire 30 is suspended in the main body tube 20. When the traction wire 30 pulls the distal tube 10, the main body tube 20 is hardly stressed, and the "humpback" phenomenon of the tube body of the bendable sheath 1 can be avoided. It should be noted that overall, the threading path of the entire traction wire 30 extends along the axial direction and sequentially passes through the first traction wire cavity 12, the inner diameter channel 22, and the second traction wire cavity 42 until reaching the proximal end of the proximal tube 40.

[0042] Optionally, the difference between the inner diameter of the third receiving cavity 41 and the inner diameter of the second receiving cavity 21 is greater than the wire diameter of the traction wire 30, avoiding the traction wire 30 from being squeezed in the inner diameter channel 22, enabling it to slide freely and avoiding the cutting effect on the traction wire 30; the difference between the inner diameter of the third receiving cavity 41 and the inner diameter of the second receiving cavity 21 is less than or equal to 2 times the wire diameter of the traction wire 30, so as to limit and guide the traction wire 30 at the step formed by this inner diameter difference, avoiding the influence of the too large movable space of the traction wire 30 on the torque transmission of the main body tube 20 and improving the bending adjustment efficiency of the distal tube 10.

[0043] Optionally, the first receiving cavity 11, the second receiving cavity 21, and the third receiving cavity 41 are substantially coaxial to facilitate the smooth passage of the interventional instrument; the first traction wire cavity 12, the inner diameter channel 22, and the second traction wire cavity 42 are substantially coaxial, so that the traction wire 30 threaded in the main body tube 20 can conform to the tube body, reducing stress concentration, thereby avoiding the displacement of the traction wire 30 caused by the distortion of the main body tube 20 during the bending adjustment, which affects the overall bending adjustment effect of the adjustable bending sheath tube 1.

[0044] Optionally, in combination Figure 11 with Figure 12 as shown, the adjustable bending sheath tube 1 further includes a channel tube 50 at least partially received in the inner diameter channel 22, and the outer diameter of the channel tube 50 is slightly smaller than the inner diameter of the inner diameter channel 22. The channel tube 50 is used to accommodate the traction wire 30, thereby protecting and isolating the traction wire 30, separating the traction wire 30 from the main body tube 20, preventing the interventional instrument threaded in the second receiving cavity 21 from entangling with the traction wire 30, and at the same time enabling the traction force of the traction wire 30 to be directly transmitted to the distal tube body 10.

[0045] Optionally, the channel tube 50 extends from the distal tube body 10 to the proximal tube body 40, or only extends from the main body tube 20 to the proximal tube body 40, and the channel tube 50 is suspended within the main body tube 20. Such a setting can ensure that the traction wire 30 is suspended within the main body tube 20 while increasing the structural diversity of the channel tube 50. Specifically, the channel tube 50 can extend from the distal end of the distal tube body 10 to the proximal end of the proximal tube body 40, or only extend from the distal end of the main body tube 20 to the proximal end of the main body tube 20. The channel tube 50 and the tube body of the adjustable bending sheath tube 1 are separated from each other, enabling the traction force of the traction wire 30 to be directly transmitted to the main body tube 20. The channel tube 50 can be made of metal materials such as stainless steel and nitinol, or can be made of high-hardness polymer materials such as polyimide and polyether ether ketone, so that the traction wire 30 is not easily deformed and remains straight, and to ensure that the traction wire 30 has sufficient suspended space.

[0046] Optionally, in combination Figures 9 - 12 as shown, the adjustable bending sheath tube 1 further includes a lining tube 60. The lining tube 60 is threaded through the first receiving cavity 11, the second receiving cavity 21, and the third receiving cavity 41. The outer wall of the lining tube 60 is closely attached to the inner wall of the first receiving cavity 11 and the inner wall of the third receiving cavity 41 respectively. There is a gap between the outer wall of the lining tube 60 and the inner wall of the second receiving cavity 21, so that the traction wire 30 is suspended outside the lining tube 60 within the tube body 23 of the main body tube 20. The lining tube 60 extends from the proximal end to the distal end of the adjustable bending sheath tube 1, making the adjustable bending sheath tube 1 have an integrally smooth and uniform inner channel. The inner cavity of the lining tube 60 is the inner cavity of the entire adjustable bending sheath 1 for the smooth passage of the interventional instrument. Among them, in combination Figure 9As shown, the outer wall of the inner liner tube 60 is in close contact with the inner wall of the first receiving cavity 11, so that the part of the traction wire 30 in the distal tube body 10, the distal tube body 10 and the inner liner tube 60 are bonded together. Similarly, the outer wall of the inner liner tube 60 is also in close contact with the inner wall of the third receiving cavity 41, and the part of the traction wire 30 in the proximal tube body 40, the proximal tube body 40 and the inner liner tube 60 are bonded together, so that the distal tube body 10, the inner liner tube 60 and the proximal tube body 40 can be tightly connected. Combining Figure 10 As shown, there is a gap between the outer wall of the inner liner tube 60 and the inner wall of the second receiving cavity 21, so that the traction wire 30 is suspended outside the inner liner tube 60 within the main tube body 20. The traction wire 30, the inner liner tube 60 and the tube body 23 of the main tube body 20 are separated from each other, so that the traction wire 30 does not directly press on the main tube body 20. The traction wire 30 suspended in the main tube body 20 can flexibly control the bending of the distal tube body 10 and can transmit torque well at the same time.

[0047] Optionally, referring to Figures 11 - 16 As shown, a first positioning ring 61 and a second positioning ring 62 are sleeved on the inner liner tube 60. The first positioning ring 61 is connected to one end of the channel tube 50, and the second positioning ring 62 is connected to the other end of the channel tube 50. Through the first positioning ring 61 and the second positioning ring 62, the channel tube 50 can be fixed on the inner liner tube 60. The fixing methods of the first positioning ring 61 and the second positioning ring 62 to the channel tube 50 include welding, fusion welding and bonding, etc.

[0048] Optionally, referring to Figure 6 、 Figure 11 and Figure 12 As shown, the tube body 23 of the main tube body 20 includes a first inner layer 232, a first strengthening layer 234 and a first outer layer 236 arranged in sequence from the inside to the outside. The main tube body 20 is connected to the distal tube body 10 and / or the proximal tube body 40 through the first strengthening layer 234. Among them, since the first inner layer 232 will be in direct contact with the interventional device loaded in the second receiving cavity 21, in order to ensure the safe loading and release of the interventional device, the first inner layer 232 should be made of a biocompatible polymer material, such as e-PTFE, to ensure that the inner surface of the first inner layer 232 is relatively smooth. The first strengthening layer 234 is used to increase the strength of the main tube body 20, so that the main tube body 20 can have sufficient hardness to penetrate into the living body. Therefore, the first strengthening layer 234 can be made of a metal material, such as stainless steel or nitinol, and the form can be a braided mesh or a spring or a cut tube network, etc.; the first outer layer 236 is in direct contact with the body fluid in the living body and needs to be bent in part. Therefore, the first outer layer 236 can be made of a thermoplastic elastomer with good biocompatibility, such as Pebax.

[0049] Optionally, combining Figure 11 and Figure 12As shown, the tube bodies of the distal tube body 10 and / or the proximal tube body 40 each include a second inner layer 132, a second reinforcing layer 134, and a second outer layer 136 that are sequentially arranged from the inside to the outside. The materials of the second inner layer 132, the second reinforcing layer 134, and the second outer layer 136 of the distal tube body 10 and / or the proximal tube body 40 are the same as those of the corresponding layers of the main tube body 20, which will not be elaborated here. Preferably, the second reinforcing layer 134 of the distal tube body 10 and / or the proximal tube body 40 and the first reinforcing layer 234 of the main tube body 20 are of an integrally formed structure, which improves the connection strength between the tube bodies of each section of the steerable sheath tube 1 and is more likely to transmit torque.

[0050] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An adjustable bending sheath tube, characterized in that, it includes: a distal tube body, a main tube body and a proximal tube body. A first accommodation cavity and a first traction wire cavity are provided at intervals in the distal tube body. The first accommodation cavity axially penetrates the distal tube body. The main tube body is connected to the proximal end of the distal tube body. A second accommodation cavity axially penetrating the main tube body is provided in the main tube body. An inner diameter channel is provided in the second accommodation cavity. The proximal tube body is connected to the proximal end of the main tube body. A third accommodation cavity and a second traction wire cavity are provided at intervals in the proximal tube body. The first accommodation cavity, the second accommodation cavity and the third accommodation cavity are substantially coaxial; a traction wire, the part of the traction wire located in the distal tube body is movably threaded through the first traction wire cavity, and the part of the traction wire located in the main tube body is movably threaded through the inner diameter channel; wherein, the first accommodation cavity and the first traction wire cavity are both communicated with the second accommodation cavity, and the inner diameter of the first accommodation cavity is smaller than the inner diameter of the second accommodation cavity, so that the traction wire is suspended in the main tube body; the adjustable bending sheath tube further includes a channel tube at least partially accommodated in the inner diameter channel, and the channel tube is used to accommodate the traction wire.

2. The adjustable bending sheath tube according to claim 1, characterized in that, the difference between the inner diameter of the first accommodation cavity and the inner diameter of the second accommodation cavity is greater than the wire diameter of the traction wire and less than or equal to 2 times the wire diameter of the traction wire.

3. The adjustable bending sheath tube according to claim 1, characterized in that, the third accommodation cavity axially penetrates the proximal tube body, and the part of the traction wire located in the proximal tube body is movably threaded through the second traction wire cavity; wherein, the third accommodation cavity and the second traction wire cavity are both communicated with the second accommodation cavity, and the inner diameter of the third accommodation cavity is smaller than the inner diameter of the second accommodation cavity, so that the traction wire is suspended in the main tube body.

4. The adjustable bending sheath tube according to claim 2, characterized in that, the difference between the inner diameter of the third accommodation cavity and the inner diameter of the second accommodation cavity is greater than the wire diameter of the traction wire and less than or equal to 2 times the wire diameter of the traction wire.

5. The adjustable bending sheath tube according to claim 3, characterized in that, the first traction wire cavity, the inner diameter channel and the second traction wire cavity are substantially coaxial.

6. The adjustable bending sheath tube according to claim 1, characterized in that, the channel tube extends from the distal tube body to the proximal tube body, or only extends from the main tube body to the proximal tube body, and the channel tube remains suspended in the main tube body.

7. The adjustable bending sheath tube according to claim 6, characterized in that, The adjustable bending sheath tube further includes a lining tube, which is inserted into the first accommodation cavity, the second accommodation cavity and the third accommodation cavity. The outer wall of the lining tube is closely attached to the inner wall of the first accommodation cavity and the inner wall of the third accommodation cavity respectively. There is a gap between the outer wall of the lining tube and the inner wall of the second accommodation cavity, so that the traction wire is suspended outside the lining tube in the tube body of the main tube body.

8. The adjustable bending sheath tube according to claim 7, wherein, a first positioning ring and a second positioning ring are sleeved on the lining tube. The first positioning ring is connected to one end of the channel tube, and the second positioning ring is connected to the other end of the channel tube.

9. The adjustable bending sheath tube according to claim 7, wherein, the tube body of the main tube body includes a first inner layer, a first strengthening layer and a first outer layer which are arranged in sequence from inside to outside. The main tube body is connected to the distal tube body and / or the proximal tube body through the first strengthening layer.

10. The adjustable bending sheath tube according to claim 9, wherein, the tube bodies of the distal tube body and / or the proximal tube body both include a second inner layer, a second strengthening layer and a second outer layer which are arranged in sequence from inside to outside, and the second strengthening layer of the distal tube body and / or the proximal tube body and the first strengthening layer of the main tube body are of an integral structure.

11. The adjustable bending sheath tube according to any one of claims 1 to 10, wherein, the adjustable bending sheath tube further includes a fixing ring, the fixing ring is embedded in the distal tube body, and the distal end of the traction wire is connected to the fixing ring.

Images