CN210301984U - Catheter with adjustable hardness and intervention device - Google Patents

Abstract

The utility model discloses a pipe and intervention device of adjustable hardness belongs to medical instrument technical field. The utility model provides a pipe includes pipe body and hardness control body, is provided with the hardness regulation hole that can peg graft the hardness control body on the pipe body. When the hardness adjusting body is inserted into the hardness adjusting hole, the hardness of the conduit can be increased, and when the hardness adjusting body is pulled out from the hardness adjusting hole, the hardness of the conduit can be reduced. And the hardness adjusting body can be partially or completely inserted into the catheter body according to requirements, so that different parts of the catheter have different hardness. The utility model provides a pipe can be according to user demand adjustment hardness number, and the pipe that has suitable hardness in the treatment process is convenient for pass through pathological change tissue, and moving direction is controllable, and the compliance is good, and the flexibility is high and the commonality is high, not only is favorable to quick, the efficient to accomplish the operation, and the operation effect is better, and the patient later stage of being convenient for resumes.

Description

Catheter with adjustable hardness and intervention device

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a pipe and intervention device of adjustable hardness.

Background

Interventional therapy is a minimally invasive treatment that is an emerging therapeutic approach between surgical and medical treatment. The interventional therapy method needs to introduce a special catheter into the human body under the guidance of medical imaging equipment so as to diagnose and locally treat the internal disease state. During treatment, the physician extends the physician's hands with the catheter. The incision (puncture point) for interventional therapy is very small, and can be used for treating various diseases such as embolism, tumor, hemangioma and the like by operation without cutting human tissues, and has the characteristics of no operation, small wound, quick recovery, good effect and the like.

With the gradual advocation of fine interventional therapy, the performance requirements of catheters used for interventional therapy are higher and higher in clinic. The catheter is used as a basic transmission tool for interventional therapy, is not only used for conveying and supporting various interventional instruments, but also has the function of monitoring rescue drugs and hemodynamics in real time in various related treatments. Therefore, the catheter is the key for success of the interventional therapy and is one of the crucial determinants for improving the success rate of the interventional therapy.

However, in clinical applications, the hardness of the existing catheter is often not suitable for special lesions. When the hardness of the catheter is too hard, the catheter cannot pass through pathological changes in a circuitous way in the pushing process, so that destructive damage is easily caused to pathological change tissues, and the subsequent operation and treatment of doctors are not facilitated; when the hardness of the catheter is too soft, the direction of the catheter is easily uncontrollable due to insufficient supporting performance of the catheter in the blood vessel, so that the catheter cannot be pushed to a target position quickly, and the operation time is prolonged. Moreover, the hardness of the catheter is generally kept consistent, the catheter cannot be adaptively adjusted according to specific requirements in the treatment process, the flexibility is poor, and the interventional operation can be finished quickly with high quality.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a pipe of adjustable hardness, this pipe hardness is adjustable, and the compliance is good, and flexibility and commonality are higher.

Another object of the utility model is to provide an intervene device, this intervene device treatment is effectual, can accomplish fast and intervene the operation.

To achieve the purpose, the utility model adopts the following technical proposal:

an adjustable stiffness catheter comprising:

the catheter comprises a catheter body, wherein a hardness adjusting hole is formed in the catheter body;

the hardness adjusting body is selectively arranged in the hardness adjusting hole, at least part of the hardness adjusting body is configured to be capable of being inserted into the hardness adjusting hole to increase the hardness of the conduit, and at least part of the hardness adjusting body is configured to be capable of being pulled out of the hardness adjusting hole to reduce the hardness of the conduit.

Preferably, the hardness adjusting hole is provided in a plurality, and each of the hardness adjusting holes is arranged along an axial direction of the catheter body.

Preferably, the number of the hardness adjusting bodies is multiple, and at least one hardness adjusting body can be inserted into each hardness adjusting hole.

Preferably, the plurality of hardness adjustment holes have different cross-sectional shapes, and the hardness adjustment holes are adapted to the shape of the hardness adjustment body located therein.

Preferably, the catheter body comprises a lubricating inner-layer tube, a supporting middle-layer tube and an outer-layer tube which are sequentially nested from inside to outside, and the hardness adjusting hole is formed in the outer-layer tube.

Preferably, the outer tube is provided with a hydrophilic lubricating coating.

Preferably, the catheter body comprises straight sections and a curved section, the curved section is arranged between two adjacent straight sections, and the curved section is configured to enable two adjacent straight sections to be parallel or collinear.

Preferably, the adjustable stiffness catheter further comprises:

the connecting seat is arranged at one end of the catheter body, an inserting hole communicated with the hardness adjusting hole is formed in the connecting seat, and the inserting hole is used for inserting the hardness adjusting body.

Preferably, the adjustable stiffness catheter further comprises:

the protection tube, the protection tube sets up between the pipe body with the connecting seat, be provided with stress relief structure on the protection tube.

An interventional device comprises the catheter with adjustable hardness.

The utility model has the advantages that:

the utility model provides a pipe of adjustable hardness, this pipe include pipe body and hardness control body, are provided with the hardness regulation hole that can peg graft the hardness control body on the pipe body. When the hardness adjusting body is inserted into the hardness adjusting hole, the hardness of the conduit can be increased, and when the hardness adjusting body is pulled out from the hardness adjusting hole, the hardness of the conduit can be reduced. And the hardness adjusting body can be partially or completely inserted into the catheter body according to requirements, so that different parts of the catheter have different hardness. The utility model provides a pipe can be according to user demand adjustment hardness number, and the pipe that has suitable hardness in the treatment process is convenient for pass through pathological change tissue, and moving direction is controllable, and the compliance is good, and the flexibility is high and the commonality is high, not only is favorable to quick, the efficient to accomplish the operation, and the operation effect is better, and the patient later stage of being convenient for resumes.

Drawings

Fig. 1 is a schematic structural view of a catheter with adjustable stiffness provided by the present invention;

FIG. 2 is a schematic structural view of the hardness-adjustable catheter according to the present invention without a hardness adjuster inserted therein;

FIG. 3 is an assembly view of the catheter body and the hardness-adjusting body provided by the present invention;

fig. 4 is a partially enlarged view of a portion a of fig. 3;

fig. 5 is a side view of a catheter body and a hardness-adjusting body provided by the present invention;

fig. 6 is a schematic structural view of a catheter body provided by the present invention;

fig. 7 is a partially enlarged view of a portion B in fig. 6;

fig. 8 is a side view of a catheter body provided by the present invention;

fig. 9 is a partially enlarged view of portion C of fig. 6;

fig. 10 is a schematic structural diagram of the protection tube provided by the present invention.

In the figure: 1. a catheter body; 11. a hardness adjusting hole; 12. lubricating the inner pipe; 13. supporting the intermediate pipe; 14. an outer tube; 101. a straight line segment; 102. a curved section;

2. a hardness adjuster;

3. a connecting seat; 301. a first connection portion; 302. a second connecting portion; 303. a rotating part; 304. an insertion hole;

4. protecting the tube; 401. a stress relief structure;

5. a hydrophilic lubricious coating.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply 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 limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present embodiments provide an adjustable stiffness catheter that can be used as a delivery tool in minimally invasive procedures to assist a physician in performing an interventional procedure on a patient. As shown in fig. 1 to 5, the catheter includes a catheter body 1 and ahardness adjuster 2, the catheter body 1 is a tubular structure having a cavity therein, and thehardness adjuster 2 is a rod-like structure. Be provided withhardness regulation hole 11 on pipe body 1,hardness regulation hole 11 can be the blind hole, also can be the through-hole, andhardness regulation hole 11 preferably extends the setting along the axis direction of pipe body 1. Thehardness adjusting body 2 is selectively disposed in thehardness adjusting hole 11. Because thehardness adjusting body 2 has certain hardness, when thehardness adjusting body 2 is inserted into thehardness adjusting hole 11, compared with the part without thehardness adjusting body 2, the hardness of the part of the conduit provided with thehardness adjusting body 2 is increased; when thehardness adjuster 2 is pulled out from thehardness adjusting hole 11, the hardness of the portion of the catheter where thehardness adjuster 2 is not provided is reduced as compared with the portion where thehardness adjuster 2 is provided. When thehardness adjusting body 2 is inserted or pulled away, a doctor can select partial insertion, partial pulling away, full insertion or full pulling away according to requirements, so that different parts of the catheter have different hardness.

In this embodiment, thehardness adjusting hole 11 is formed in the catheter body 1, and thehardness adjusting body 2 is inserted into or pulled out of thehardness adjusting hole 11 according to the progress and the requirement of the interventional therapy, so that the hardness of the catheter can be adjusted to different values, and the catheter has the hardness most suitable for the progress of the therapy. Compared with a catheter with invariable hardness, the catheter with the invariable hardness has good compliance and high flexibility and universality, is beneficial to quickly and efficiently completing the operation, can also improve the operation effect, and is convenient for the later recovery of patients. Moreover, the hardness of the catheter is changed by inserting and pulling thehardness adjusting body 2, so that the operation is simple, the controllability is high, and the adjustment range of the hardness is wide.

Specifically, as shown in fig. 1 and 4, thehardness adjuster 2 is a rod-like structure made of a metal material or a polymer material. The metal material may be a metal wire such as a nickel titanium wire (NiTi) or a stainless steel wire, etc. Thehardness adjuster 2 made of a polymer material or a metal material has a certain toughness and supporting hardness. Preferably, thehardness adjuster 2 itself has a hardness greater than that of the original catheter body 1 (when thehardness adjuster 2 is not provided).

As shown in fig. 3 to 8, the catheter body 1 is a cylindrical structure, and the catheter body 1 is a cylindrical structure without edges and corners, so that the smoothness of the movement of the catheter in the patient can be improved, and the catheter can be prevented from scratching the normal tissues in the patient. The outer diameter of the catheter body 1 preferably ranges from 0.5mm to 4mm, and may for example be 0.5mm, 1mm, 2mm, 2.5mm, 3mm, 3.6mm or 4 mm. The one end that pipe body 1 stretched into the patient is internal has the circular arc structure, and the tip fish tail patient internal normal tissue of pipe can be avoided to the circular arc structure. In order to facilitate the use of the catheter with an external imaging device, so that a doctor can clearly grasp the position of the catheter in the patient, an X-ray opaque material is further disposed in the catheter body 1, and the X-ray opaque material may be a heavy metal material, such as platinum-iridium alloy or gold.

Further, the catheter body 1 may have a single-layer structure or a multi-layer structure. In order to improve the performance of the catheter body 1, the catheter body 1 is preferably provided as a multi-layer structure, and as shown in fig. 4 and 7, in the present embodiment, the catheter body 1 has a three-layer structure including a lubricatinginner layer tube 12, a supportingmiddle layer tube 13 and anouter layer tube 14 which are nested in this order from inside to outside. Of course, in other embodiments, the catheter body 1 may also include two or more layers, and is not limited in particular.

Specifically, the lubricatinginner tube 12 is a tubular structure made of a polymer material having a lubricating effect. The polymer material may be Polytetrafluoroethylene (PTFE), fluorinated ethylene propylene copolymer (FEP), or other materials having a low friction coefficient. The inner wall surface of the lubricatinginner layer pipe 12 made of the low friction coefficient material forms a lubricating pipe cavity which has a lubricating effect and is convenient for the liquid injected into the lubricating pipe cavity to flow.

The supportintermediate pipe 13 is mainly used to support the entire catheter body 1 to improve the structural strength of the catheter body 1. The supporting middle-layer pipe 13 is made of metal wire or high polymer materials and is arranged between the lubricating inner-layer pipe 12 and the outer-layer pipe 14 in a spiral or weaving structure. Further, the spiral density or the weave density of the supportingmiddle layer tube 13 in the length direction of the lubricatinginner layer tube 12 may be the same or different. In this embodiment, it is preferable to be different so that different portions of the catheter body 1 have different hardness. Further, the spiral density or the braid density of the supportingmedium tube 13 near the operating end of the doctor is preferably larger than that of the supportingmedium tube 13 far from the operating end of the doctor, and the increasing tendency may be uniformly increased or non-uniformly increased, and is not particularly limited herein.

Theouter tube 14 is mainly used for fixing and supporting themiddle tube 13, setting thehardness adjusting hole 11 and contacting with the internal tissues of the patient. In this embodiment, theouter tube 14 is a tube made of a flexible polymer material. The plastic high polymer material can be nylon (PA or Pebax), polyvinyl chloride (PVC), silicon rubber, polypropylene (PP), Polyethylene (PE) and other formable tube materials. Further, in order to smoothly move the catheter body 1 in the blood vessel of the patient, reduce friction against the blood vessel wall when the catheter body 1 is introduced into the blood vessel, and reduce damage of the catheter to the blood vessel wall, as shown in fig. 2, ahydrophilic lubricating coating 5 is provided on the outer wall surface of theouter tube 14. The hydrophiliclubricious coating 5 is a layered structure made of a material having hydrophilic properties, being wettable, lubricious, suitable for specific biological interactions, and suitable for application over medical device interventional products. Thehydrophilic lubricating coating 5 can chemically interact with water to form a gel material which exhibits a very low coefficient of friction and super-lubricity. Still further, thehydrophilic lubricating coating 5 may be a single-layer structure or a multi-layer structure, preferably a multi-layer structure, to improve the lubricating performance.

In the present embodiment, thehardness adjustment hole 11 is provided in theouter tube 14, and extends from one end of theouter tube 14 near the doctor's operating end to the other end of theouter tube 14 in the axial direction of theouter tube 14. Of course, in other embodiments, if the catheter body 1 has a more layered structure, the hardness-adjustinghole 11 may be provided in the outermost layer or the middle layer. Alternatively, the number of the hardness adjustment holes 11 may be one or more, and in the present embodiment, as shown in fig. 4 and 7, preferably, a plurality of holes are provided. The hardness adjusting holes 11 are arranged at intervals in the circumferential direction of theouter layer pipe 14, and are preferably uniformly distributed. The bending property of the catheter body 1 bending to different directions can be changed by selecting differenthardness adjusting holes 11 to insert thehardness adjusting bodies 2, so that the catheter body 1 can give consideration to the bending property when having good hardness property, and the catheter body 1 is easy to pass through pathological change tissues in a tortuous manner.

Alternatively, the sectional shapes of the plurality of hardness-adjustingholes 11 may be the same, and as shown in fig. 4 and 5, the sectional shapes of the hardness-adjustingholes 11 are all circular. Of course, as shown in fig. 7 and 8, the cross-sectional shape of some of the hardness adjusting holes 11 may be circular, and the cross-sectional shape of some of the hardness adjusting holes 11 may be trapezoidal. The hardness-adjustingholes 11 of different sectional shapes are preferably provided at intervals in the circumferential direction of the catheter body 1. Of course, in other embodiments, the shape of thehardness adjusting hole 11 may be a regular shape such as a rectangle, a parallelogram, or an ellipse, or other irregular shapes. The sectional shape is preferably the same throughout each hardness-adjustinghole 11 to facilitate insertion of the hardness-adjustingbody 2. Correspondingly, the shape of thehardness adjustment body 2 is adapted to the shape of thehardness adjustment hole 11. Through setting up thehardness regulation hole 11 of different shapes, can peg graft thehardness regulation body 2 of different shapes, the bending force and the hardness of thehardness regulation body 2 of different shapes are different, can make pipe body 1 have different hardness attribute and bending attribute. For example, the bending forces of the square and the circular shape are different for the same sectional area of the hardness-adjustingbody 2.

The plurality of hardness adjustment holes 11 may have the same or different depths. In this embodiment, thehardness adjusting holes 11 are preferably different from each other so as to insert thehardness adjusting bodies 2 having different lengths, thereby achieving the purpose of making the hardness of the catheter body 1 different at different portions. The length of eachhardness adjustment hole 11 is not particularly limited and is specifically set according to the specific situation.

Further, in order to improve the bending performance of the catheter and enable the catheter to deliver therapeutic drugs, embolic agents, stents, coils, etc. to a target lesion site according to changes in the blood vessel or lesion conditions of a patient, the catheter body 1 provided in this embodiment is provided with a bendable joint structure. As shown in fig. 1, 3, 6 and 9, the catheter body 1 includes twostraight segments 101 and acurved segment 102, and thecurved segment 102 is the above-mentioned bendable joint structure, which is a tubular structure made of an easily deformable material. Thebending section 102 is arranged between the twostraight sections 101, and two adjacentstraight sections 101 can be parallel by bending thebending section 102, that is, onestraight section 101 is bent 180 degrees towards the side where the otherstraight section 101 is located, so that the effect that the twostraight sections 101 are parallel is achieved. While thecurved segment 102 remains straight, it is possible to make the twostraight segments 101 collinear. Of course, in other embodiments, multiple bendable joint structures may be provided on the catheter body 1. The main functions of the bendable joint structure are to ensure that thestraight line section 101 of the catheter body 1 is not bent when the catheter is bent, and eliminate redundant supporting stress when the catheter is bent, so that the compliance of the catheter is better, the recovery elasticity of the catheter is reduced, and the catheter can be easily guided into a tortuous vessel or a passage.

Further, in order to facilitate the operation of the catheter body 1 by the doctor, the catheter further comprises aconnection hub 3. As shown in fig. 1 and 2, theconnection holder 3 is a luer connection holder, which is provided at one end of the catheter body 1. Theconnector holder 3 includes afirst connection portion 301, arotation portion 303, and asecond connection portion 302 connected in this order. The first connectingportion 301 is provided with aninsertion hole 304 communicating with thehardness adjustment hole 11, and theinsertion hole 304 is used for inserting thehardness adjustment body 2. Compared with the inserting method of inserting thehardness adjusting body 2 along the axial direction of the catheter body 1, thehardness adjusting body 2 is bent to enter thehardness adjusting hole 11 after being inserted in the radial direction of the connectingseat 3, so that the operation habit of a doctor is better met, the force application of the doctor is facilitated, the alignment difficulty is reduced, and thehardness adjusting body 2 can be inserted and pulled out quickly. Therotating part 303 includes two rotary vanes that set up relatively, and the doctor holds the rotary vane to rotate and can realize the purpose of rotatory pipe body 1. Thesecond connector 302 is provided with a luer thread structure, which is provided to facilitate connection of the catheter with an external catheter delivery device.

Further, in order to improve the connection strength between theconnection holder 3 and the catheter body 1 and prevent the catheter body 1 and theconnection holder 3 from being broken when the catheter is excessively bent, the catheter further includes aprotection tube 4. As shown in fig. 1 and 2, aprotection tube 4 is disposed between the catheter body 1 and theconnection hub 3, and theprotection tube 4 is made of a soft polymer material, such as silicone rubber. Theprotection tube 4 is provided with astress relief structure 401, and specifically, as shown in fig. 10, thestress relief structure 401 is a groove structure provided on theprotection tube 4, and the arrangement of the groove structure makes the outer diameter of theprotection tube 4 be a gradual change structure, so that the stress concentrated between the catheter body 1 and theconnection seat 3 can be relieved when the catheter is bent, and the purpose of preventing the catheter body 1 and theconnection seat 3 from cracking or even breaking is achieved.

The use method of the catheter with adjustable hardness comprises the following steps:

before starting the interventional therapy, preparation is required, and firstly, a doctor assembles the injection device on the connectingseat 3 and then injects liquid into the lubricating cavity of the catheter body 1. Then, according to the case evaluation before the operation, whether or not to fill thehardness adjusting body 2 in thehardness adjusting hole 11 of the catheter body 1 is selected. Specifically, thehardness adjusting body 2 may not be filled in thehardness adjusting hole 11 in advance, and thehardness adjusting body 2 may be added when insufficient supporting force occurs during introduction of the catheter body 1 into the patient's body passage or blood vessel; alternatively, thehardness adjuster 2 may be inserted into all thehardness adjusting holes 11 in advance, and when the hardness of the catheter body 1 is too high during introduction into a blood vessel or a passage, part or all of thehardness adjuster 2 may be removed.

When starting interventional therapy, a doctor firstly soaks or coats the surface of the catheter with medical liquid to ensure that thehydrophilic lubricating coating 5 arranged on the catheter body 1 has a lubricating effect; the physician then introduces the stiffness-adjustable, flexible joint structure-bearing catheter into a body vessel or passageway by puncture. In the process of pushing the catheter, if the introduction difficulty occurs and causes the reason of the introduction difficulty is that the support hardness of the catheter body 1 is insufficient and the catheter is soft, the doctor can insert thehardness adjusting body 2 into theinsertion hole 304 of theconnection seat 3, insert thehardness adjusting body 2 into thehardness adjusting hole 11 from theinsertion hole 304 and insert the hardness adjusting body to a certain depth until the catheter becomes hard enough to continue to push and introduce into the blood vessel.

If the catheter is found to be too hard to puncture blood vessels or tissues in the introduction process, part or all of thehardness adjusting body 2 can be drawn outwards, so that the aim of reducing the hardness of the catheter and enabling the catheter body 1 to become soft and compliant is fulfilled. The length of the extraction can be controlled according to the actual clinical requirement, and the amount of the extraction can also be selected to be extracted partially or completely according to the hardness requirement.

In the process of guiding the catheter into the blood vessel, if the catheter is bent by 180 degrees, the bending can be realized by controlling the position of the bendable joint structure on the catheter body 1, and the joint structure is placed at the position with the minimum size of the bending radius of the blood vessel, so that the catheter can be prevented from being broken and can be adapted to the bent blood vessel.

The present embodiments also provide an interventional device comprising an adjustable stiffness catheter as described above. Through utilizing above-mentioned pipe, this intervention device can accomplish intervention treatment fast, high-efficiently, is favorable to improving intervention treatment's efficiency and patient's postoperative recovery effect.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An adjustable stiffness catheter, comprising:

the catheter comprises a catheter body (1), wherein a hardness adjusting hole (11) is formed in the catheter body (1);

a hardness adjusting body (2), the hardness adjusting body (2) can be selectively arranged in the hardness adjusting hole (11), at least part of the hardness adjusting body (2) is configured to be capable of being inserted into the hardness adjusting hole (11) to increase the hardness of the catheter, and at least part of the hardness adjusting body (2) is configured to be capable of being drawn out from the hardness adjusting hole (11) to reduce the hardness of the catheter.

2. The adjustable stiffness catheter of claim 1,

the number of the hardness adjusting holes (11) is multiple, and each hardness adjusting hole (11) is arranged along the axial direction of the catheter body (1).

3. The adjustable stiffness catheter of claim 2,

the quantity of hardness regulation body (2) is a plurality of, every can peg graft at least one in hardness regulation hole (11) hardness regulation body (2).

4. The adjustable stiffness catheter of claim 2,

the cross-sectional shapes of the hardness adjusting holes (11) are different, and the hardness adjusting holes (11) are matched with the shapes of the hardness adjusting bodies (2) positioned in the hardness adjusting holes.

5. The adjustable stiffness catheter of claim 1,

the catheter body (1) comprises a lubricating inner-layer tube (12), a supporting middle-layer tube (13) and an outer-layer tube (14) which are sequentially nested from inside to outside, and the hardness adjusting hole (11) is formed in the outer-layer tube (14).

6. The adjustable stiffness catheter of claim 5,

the outer layer pipe (14) is provided with a hydrophilic lubricating coating (5).

7. The adjustable stiffness catheter of claim 1,

the catheter body (1) comprises straight sections (101) and a bent section (102), wherein the bent section (102) is arranged between two adjacent straight sections (101), and the bent section (102) is configured to enable two adjacent straight sections (101) to be parallel or collinear.

8. The adjustable stiffness catheter of claim 1, further comprising:

the connecting seat (3), the connecting seat (3) sets up the one end of pipe body (1), be provided with on connecting seat (3) with the patchhole (304) of hardness regulation hole (11) intercommunication, patchhole (304) are used for inserting hardness regulation body (2).

9. The adjustable stiffness catheter of claim 8, further comprising:

the protection tube (4), the protection tube (4) set up catheter body (1) with between connecting seat (3), be provided with stress relief structure (401) on protection tube (4).

10. An interventional device comprising an adjustable stiffness catheter of any one of claims 1-9.

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