A medical catheter

Abstract

The present invention provides a medical catheter, comprising a tube body, the tube body having an instrument channel and a plurality of accommodating cavities; the plurality of accommodating cavities are arranged at intervals along the circumference of the tube body; the accommodating cavities are isolated from the instrument channel, and the accommodating cavities are used to accommodate a target object; when at least part of the accommodating cavities accommodate the target object, the target object exerts a radially outward force on the wall of the tube body along the corresponding accommodating cavity, and causes the wall of the tube body located on the side of the accommodating cavity accommodating the target object away from the axis of the tube body to expand radially outward along the tube body. During the use of the medical catheter, the wall of the tube body is partially expanded radially outward by arranging a target object capable of exerting a force on the wall of the tube body in the accommodating cavity, so that the outer side surface of the tube body can at least partially abut against the blood vessel wall to improve the positioning stability of the medical catheter in the blood vessel, so that the medical catheter is not prone to displacement, flipping and other problems.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a medical catheter. Background Art

[0002] Interventional treatment is a percutaneous puncture under the guidance of medical imaging equipment (such as angiography, fluoroscopy, CT, MR, B-ultrasound, etc.) to introduce precision instruments such as puncture needles, catheters, supports, etc. into blood vessels for minimally invasive diagnosis and treatment of diseases. Media therapy has the characteristics of less trauma, less discomfort to patients, faster recovery of patients, and targeted treatment. It can effectively treat some patients who cannot tolerate surgery or have lost the opportunity for surgery or are resistant to drugs. In some areas, it has replaced surgery as the preferred treatment option.

[0003] Catheters are important tools in interventional therapy. Since 1929, when Dr. Werner Forssmann performed angiography with a rubber catheter through the antecubital vein, proving the feasibility of pulmonary artery catheter implantation, various types of catheters have been developed to meet different medical purposes. For example, the catheter can be straight or curved, and the distal end of the catheter can be tapered or not. When the catheter is used, it generally enters the vascular access through a sheath and reaches the target position in the blood vessel under the guidance of a guidewire. Once the catheter reaches the target position, the operator can use the catheter to perform some operations, such as angiography, balloon or stent or other medical device delivery and release. However, the diameter of the catheter in the prior art is generally fixed and cannot be adjusted, but blood vessels in different regions have different diameters. When the catheter passes through a tortuous blood vessel region with a larger diameter, the catheter does not fit the blood vessel wall, which results in the catheter being displaced or flipped due to uneven force in the circumferential direction when a device passes through the lumen of the catheter. Summary of the invention

[0004] The object of the present invention is to provide a medical catheter, aiming to improve the positioning stability of the medical catheter in a blood vessel.

[0005] To achieve the above-mentioned purpose, the present invention provides a medical catheter, comprising a tube body, the tube body having an instrument channel extending through it along its own axial direction; the tube body also having a plurality of accommodating cavities extending along its own axial direction, the plurality of accommodating cavities being arranged at intervals along the circumference of the tube body and being located at the outer periphery of the instrument channel; the accommodating cavities being isolated from the instrument channel and being used to accommodate a target object; the medical catheter is configured such that when at least part of the accommodating cavity accommodates the target object, the target object can exert a radially outward force on the wall of the tube body along the corresponding accommodating cavity, and cause a portion of the wall of the tube body located on a side of the accommodating cavity accommodating the target object away from the axis of the tube body to expand radially outwardly along the tube body.

[0006] Optionally, the tube body includes a first tube body and a second tube body, the second tube body is at least partially inserted into the first tube body, and the tube cavity of the second tube body constitutes the instrument channel; the elastic modulus of the second tube body is greater than the elastic modulus of the first tube body; the accommodating cavity is arranged on the first tube body, or the accommodating cavity is arranged between the first tube body and the second tube body.

[0007] Optionally, there is a gap between the inner side surface of the first tube body and the outer side surface of the second tube body; the tube body also includes a plurality of third tube bodies, the plurality of third tube bodies are arranged between the inner side surface of the first tube body and the outer side surface of the second tube body, and the plurality of third tube bodies are arranged at intervals along the circumference of the medical catheter; the elastic modulus of the third tube body is smaller than the elastic modulus of the second tube body, and the lumen of each third tube body constitutes one accommodating cavity; the medical catheter is configured such that when at least one of the accommodating cavities accommodates the target object, the third tube body where the accommodating cavity accommodating the target object is located expands in its own radial direction, and causes the portion of the first tube body located at the third tube body accommodating the target object to expand outward in the radial direction of the tube body.

[0008] Optionally, there is a gap between the inner side surface of the first tube body and the outer side surface of the second tube body; the tube body also includes a plurality of filling bodies, and the plurality of filling bodies are filled between the first tube body and the second tube body at intervals along the circumference of the tube body, and the space between two adjacent filling bodies constitutes a accommodating cavity.

[0009] Optionally, the inner circumference of the first tube body is in contact with the outer circumference of the second tube body, and the first tube body is provided with the accommodating cavity.

[0010] Optionally, the medical catheter also includes a target object, which is a support body; the size of the cross-section of the support body in a preset direction is larger than the size of the accommodating cavity in a natural state in the radial direction of the tube body; when the accommodating cavity accommodates the target object, the preset direction extends along the radial direction of the tube body.

[0011] Optionally, the second tube body includes a first tube layer, a second tube layer and a third tube layer arranged in sequence from inside to outside, and the second tube layer includes a metal layer.

[0012] Optionally, the second tube layer includes a metal braided layer, and the metal braided layer is wrapped on the outer circumferential surface of the second tube layer.

[0013] Optionally, the second tube layer includes a metal helical spring structure, and the helical spring structure is sleeved on the outer circumferential surface of the second tube layer.

[0014] Optionally, the second tube layer is formed into an integral structure with the first tube layer and the second tube layer through an insert injection molding process.

[0015] Compared with the prior art, the medical catheter of the present invention has the following advantages: the aforementioned medical catheter includes a tube body, the tube body having an instrument channel extending through it along its own axial direction; a plurality of accommodating cavities extending along its own axial direction are formed on the wall of the tube body, and the plurality of accommodating cavities are arranged at intervals along the circumferential direction of the tube body; the accommodating cavities are isolated from the instrument channel and are used to accommodate a target object; the medical catheter is configured such that when at least part of the accommodating cavities accommodate a target object, the target object applies a radially outward force along the corresponding accommodating cavity to the wall of the tube body, and causes a portion of the wall of the tube body located on the side of the accommodating cavity that accommodates the target object and is away from the axis of the tube body to expand radially outward along the tube body. That is, during the use of the medical catheter, the target object capable of exerting force on the wall of the tube body is arranged in the accommodating cavity, so that the wall of the tube body is partially expanded radially outward, so that the outer surface of the tube body can at least partially abut against the blood vessel wall, thereby improving the positioning stability of the medical catheter in the blood vessel and making it less likely for the medical catheter to be displaced, flipped, or otherwise affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to better understand the present invention and shall not constitute improper limitations of the present invention.

[0017] Figure 1 It is a schematic structural diagram of a medical catheter provided according to an embodiment of the present invention.

[0018] Figure 2 It is a partially enlarged schematic diagram of a medical catheter provided according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of an application scenario of a medical catheter provided according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic structural diagram of a tube body of a medical catheter provided according to an embodiment of the present invention.

[0021] Figure 5 is a schematic structural diagram of a tube body of a medical catheter provided according to an embodiment of the present invention, Figure 5 A plurality of tortuous portions are formed on the tube body.

[0022] Figure 6 It is a partially enlarged schematic diagram of a tube body of a medical catheter provided according to an embodiment of the present invention.

[0023] Figure 7 It is a partially enlarged schematic diagram of a tube body of a medical catheter provided according to another embodiment of the present invention.

[0024] Figure 8 It is a partially enlarged schematic diagram of a tube body of a medical catheter provided according to another embodiment of the present invention.

[0025] [Description of the accompanying drawings is as follows]: 1-blood vessel wall, 10-medical catheter, 100-tube body, 101-instrument channel, 102-accommodating cavity, 103-target area, 110-first tube body, 120-second tube body, 121-first tube layer, 122-second tube layer, 123-third tube layer, 130-third tube body, 140-filling body, 200-target object. DETAILED DESCRIPTION

[0026] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0027] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0028] As used in this specification, the singular forms "one", "an" and "the" include plural objects, and the plural form "multiple" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. Relational terms such as the terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly indicate the number of technical features indicated. 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 circumstances.

[0029] The terms "proximal end" and "distal end" mentioned in this article are described based on the relative positions and orientations of the various elements and components of the medical device. Although non-limiting, the "proximal end" is usually the end closer to the operator during normal use of the medical device, and the "distal end" is the end away from the operator or the end that first enters the patient's body.

[0030] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0031] like Figures 1 to 8As shown, the medical catheter 10 includes a tube body 100, and the tube body 100 has an instrument channel 101 extending through the tube body 100 along its own axial direction. The tube body 100 also has a receiving cavity 102 extending along its own axial direction. The number of the receiving cavities 102 is multiple, and the multiple receiving cavities 102 are arranged at intervals along the circumference of the tube body 100 and are located on the outer periphery of the instrument channel 101. The receiving cavity 102 is isolated from the instrument channel 101. The receiving cavity 102 is used to receive the target 200. The medical catheter 10 is configured such that when at least a portion of the accommodating cavity 102 accommodates the target object 200, the target object 200 applies a radially outward force along the corresponding accommodating cavity 102 to the wall of the tube body 100, and causes a portion of the wall of the tube body 100 located on a side of the accommodating cavity 102 accommodating the target object 200 that is away from the axis of the tube body 100 to expand radially outward along the tube body 100.

[0032] For ease of understanding, please refer to Figure 3 , the portion of the wall of the tube body 100 located on the side of each accommodating cavity 102 away from the axis of the tube body 100 is called the target area 103. Figure 3 As shown in the example, eight accommodating chambers 102 are provided on the wall of the tube body 100, six of which accommodate the target objects 200. The six accommodating chambers 102 accommodating the target objects 200 are respectively referred to as the first accommodating chamber, the second accommodating chamber, the third accommodating chamber, the fourth accommodating chamber, the fifth accommodating chamber, and the sixth accommodating chamber. Thus, the target area 103 located at the first accommodating chamber expands radially outwardly along the tube body 100 under the action of the target object 200 in the first accommodating chamber; the target area 103 located at the second accommodating chamber expands radially outwardly along the tube body 100 under the action of the target object 200 in the second accommodating chamber; the target area 103 located at the third accommodating chamber expands radially outwardly along the tube body 100 under the action of the target object 200 in the third accommodating chamber; the target area 103 located at the fourth accommodating chamber expands radially outwardly along the tube body 100 under the action of the target object 200 in the fourth accommodating chamber; the target area 103 located at the fifth accommodating chamber expands radially outwardly along the tube body 100 under the action of the target object 200 in the fifth accommodating chamber; the target area 103 located at the sixth accommodating chamber expands radially outwardly along the tube body 100 under the action of the target object 200 in the sixth accommodating chamber. It should be noted that, during the deformation of the target area 103 , the instrument channel 101 of the tube body 100 does not change.

[0033] Therefore, when the medical catheter 10 is used to perform vascular intervention, the tube body 100 can be partially inserted into the blood vessel first. At this time, the outer diameter of the tube body 100 is smaller, making it easier to move in the blood vessel. After the distal end of the tube body 100 reaches the target position in the blood vessel, if the diameter of the blood vessel is too large, the outer surface of the tube body 100 does not touch the blood vessel wall 1 (such as Figure 3 When the target object 200 abuts against the vascular wall 1, the operator can fill the target object 200 into at least a portion of the accommodating cavity 102 as needed, so that the cross section of the tube body 100 changes, and at least the outer side surface of the tube body 100 abuts against the vascular wall 1 at the portion of the accommodating cavity 102 filled with the target object 200 (such as Figure 3 As shown). In this way, the tube body 100 can maintain its position in the blood vessel by virtue of the friction between its outer side and the blood vessel wall 1, so that when an instrument or a guide wire passes through the instrument channel 101, or when the instrument channel 101 is used to perform some large-scale treatment operations such as thrombus aspiration, the tube body 100 can be effectively prevented from shifting or flipping due to uneven force. The instruments include but are not limited to balloons, stents, etc.

[0034] In actual application, it is preferred that the number of the accommodating cavities 102 filled with the target object 200 is at least two. The embodiment of the present invention does not particularly limit the number and specific distribution of the accommodating cavities 102 filled with the target object 200, as long as the tube body 100 can have more than three contact points with the blood vessel wall 1 to ensure that the tube body 100 is stably positioned in the blood vessel.

[0035] In a further preferred embodiment, more than three accommodating cavities 102 are filled with the target object 200, and the accommodating cavities 102 filled with the target object 200 are arranged at equal intervals along the circumference of the tube body 100, or, as Figure 3 As shown, the accommodating cavity 102 filled with the target 200 can be divided into two accommodating cavity groups, and the two accommodating cavity groups are symmetrical around the axis of the tube body 100. This can improve the force balance of the tube body 100.

[0036] It should be noted that the axis of the tube body 100 described in this article refers to a straight line passing through the center of any cross-section of the tube body 100 and extending along the extension direction of the tube body 100, the circumferential direction of the tube body 100 refers to the direction surrounding the axis of the tube body 100, and the radial direction of the tube body 100 refers to the extension direction of the straight line located on the cross-section of the tube body 100 and passing through the center of the cross-section of the tube body 100.

[0037] In some embodiments, the instrument channel 101 is coaxial with the tube body 100 in the natural state, and in other embodiments, the instrument channel 101 is not coaxial with the tube body 100 in the natural state. It should be understood that when all the accommodating cavities 102 are not filled with the target 200, the tube body 100 is in the natural state.

[0038] In addition, the cross-section of the accommodating cavity 102 is circular or non-circular. Regardless of whether the cross-section of the accommodating cavity 102 is circular, the radial direction of the accommodating cavity 102 refers to the extension direction of the straight line located on the cross-section of the accommodating cavity 102 and passing through the center of the cross-section of the accommodating cavity 102.

[0039] It should also be noted that the accommodating cavity 102 is at least open at the proximal end of the tube body 100, so as to allow the operator to fill the target object 200 into the accommodating cavity 102 at the proximal end of the tube body 100. The embodiment of the present invention has no special limitation on the specific type of the target object 200, as long as the target area 103 at the accommodating cavity 102 filled with the target object 200 can be expanded radially outwardly of the tube body 100 by filling the accommodating cavity 102 with the target object 200.

[0040] In some examples, the target object 200 is a support body, and the support body is used to at least partially penetrate the accommodating cavity 102. In order to achieve the aforementioned purpose of "filling the target object 200 in the accommodating cavity 102, so that the target area 103 at the accommodating cavity 102 filled with the target object 200 can expand outward along the radial direction of the tube body 100", the size of the cross section of the support body in a preset direction should be larger than the size of the accommodating cavity 102 in a natural state in the radial direction of the tube body 100, and when the support body is at least partially penetrated in the accommodating cavity 102, the preset direction is extended along the tube body 100.

[0041] In a specific embodiment, the cross-section of the support body and the cross-section of the accommodating cavity 102 are both circular, and the outer diameter of the support body is larger than the diameter of the accommodating cavity 102 in a natural state. In another specific embodiment, the cross-section of the accommodating cavity 102 is elliptical, and the short axis of the ellipse where the cross-section of the accommodating cavity 102 is located extends along the radial direction of the tube body 100, the cross-section of the support body is circular, and the outer diameter of the support body is larger than the length of the short axis of the cross-section of the accommodating cavity 102 in a natural state, for example, it can be equal to the length of the long axis of the cross-section of the accommodating cavity 102 in a natural state. In this way, when the support body is at least partially disposed in the accommodating cavity 102, the target area 103 at the accommodating cavity 102 where the support body is accommodated can be deformed and expand outwardly along the radial direction of the tube body 100.

[0042] It should be noted that when the receiving cavity 102 is not filled with the target object 200, the receiving cavity 102 is in a natural state. In addition, when the target object 200 is the support body, the distal end of the receiving cavity 102 can be an open end or a closed end.

[0043] The support body can be a slender structure made of metal. The metal used to prepare the support body should have good biocompatibility, and the optional metal is, for example, shape memory alloy or stainless steel.

[0044] In other examples, the distal end of the accommodating cavity 102 is a closed end, and the target object 200 is a fluid. When the amount of the fluid filled into the accommodating cavity 102 is large enough, the filling pressure in the accommodating cavity 102 increases to a level that can cause the target area 103 to expand radially outwardly along the tube body 100. The fluid can be a liquid or a gas.

[0045] In addition, according to actual conditions, the accommodating chambers 102 may be connected or not connected. For example, when the target object 200 is the support body, at least some of the accommodating chambers 102 may be connected. For another example, when the target object 200 is a fluid, it is preferred that the accommodating chambers 102 are not connected to each other.

[0046] It can be understood that when the target object 200 is the support body, the medical catheter 10 can include the support body.

[0047] Please continue to refer to Figures 1 to 8Optionally, the tube body 100 includes a first tube body 110 and a second tube body 120, the first tube body 110 is sleeved on the outer circumference of the second tube body 120, and the first tube body 110 and the second tube body 120 remain relatively stationary in any appropriate manner. In this way, the area between the outer side surface of the first tube body 110 and the inner side surface of the second tube body 120 constitutes the wall of the tube body 100, and the lumen of the second tube body 120 constitutes the instrument channel 101. The elastic modulus of the first tube body 110 is smaller than the elastic modulus of the second tube body 120. The accommodating cavity 102 is arranged on the first tube body 110, or the accommodating cavity 102 is arranged between the first tube body 110 and the second tube body 120. In this way, the target area 103 is at least located on the first tube body 110.

[0048] The elastic modulus is a physical quantity used to describe the elasticity of a substance. The larger the elastic modulus, the less likely the substance is to deform, and the smaller the elastic modulus, the easier the substance is to deform. In the embodiment of the present invention, the elastic modulus of the first tube body 110 is small and is easily deformed under the action of the target object 200, so that the target area 103 can expand outward along the radial direction of the tube body 100 under the action of the target object 200; the elastic modulus of the second tube body 120 is large and will not be deformed under the action of the target object 200, so that the instrument channel 101 is not affected by the target object 200.

[0049] In an exemplary embodiment, the first tube body 110 is made of a polymer material. The polymer material that can be used to prepare the first tube body 110 includes but is not limited to at least one of nylon, segmented polyetheramide elastomer (Pebax), and polyurethane (TPU).

[0050] The second tube body 120 is a composite tube. Figure 2 , Figure 3 , Figures 6 to 8As shown, the second tube body 120 may include a first tube layer 121, a second tube layer 122 and a third tube layer 123 arranged in sequence from the inside to the outside, the first tube layer 121 is a tube layer made of any suitable polymer material, and the polymer material that can be used to prepare the first tube layer 121 is, for example, polytetrafluoroethylene (PTFE), so that the wall of the instrument channel 101 has good lubricity, reducing the resistance of the guide wire or instrument when passing through the instrument channel 101. The second tube layer 122 includes a metal layer, such as a metal braided layer, and the metal braided layer is wrapped on the outer peripheral surface of the first tube layer 121, or the metal layer is composed of a spiral spring structure made of metal, and the spiral spring structure is sleeved on the outer peripheral surface of the first tube layer 121. The third tube layer 123 can be any suitable polymer material, such as at least one of nylon, front-end polyether amide elastomer, polyurethane, etc. This form of the second tube body 120 has a sufficiently large elastic modulus to resist the force applied by the target object 200, ensuring that the second tube body 120 is not deformed under the action of the target object 200 and that the instrument channel 101 does not change.

[0051] Alternatively, if Figure 2 , Figure 3 and Figure 6 As shown, there is a gap between the inner side of the first tube body 110 and the outer side of the second tube body 120, so that an annular cavity is formed between the first tube body 110 and the second tube body 120. The tube body 100 further includes a plurality of third tube bodies 130, which are disposed in the annular cavity and arranged at intervals along the circumference of the tube body 100. The third tube body 130 extends along the axial direction of the tube body 100, and the third tube body 130 remains relatively stationary with the first tube body 110 and the second tube body 120. The elastic modulus of the third tube body 130 is smaller than the elastic modulus of the second tube body 120, and the tube cavity of each of the third tube bodies 130 constitutes one of the accommodating chambers 102. In this way, the target 200 is filled in the tube cavity of the third tube body 130.

[0052] When the target object 200 is filled in the lumen of the third tube body 130, the target object 200 applies a radially outward force along the third tube body 130 to the wall of the corresponding third tube body 130, so that the third tube body 130 expands radially outward. The radially expanded third tube body 130 applies a radially outward force along the radial expansion of the third tube body 130 to the first tube body 110 and the second tube body 120, and the portion of the first tube body 110 located at the expanded third tube body 130 expands radially outward of the tube body 100. That is, the target area 103 is also partially located on the third tube body 130.

[0053] In this embodiment, the first tube body 110 , the second tube body 120 , and the third tube body 130 may be kept relatively still in any appropriate manner.

[0054] For example, the first tube body 110, the second tube body 120 and the third tube body 130 are formed separately, and then the first tube body 110 and the third tube body 130 are bonded to each other, and the third tube body 130 and the second tube body 120 are bonded to each other. It should be understood that when preparing the second tube body 120, the second tube layer 122 is prepared first, and then the first tube layer 121 and the third tube layer 123 are formed at one time by insert injection molding, and the first tube layer 121, the second tube layer 122, and the third tube layer 123 are connected.

[0055] For another example, the second tube layer 122 of the second tube body 120 is first prepared, and then the first tube body 110, the first tube layer 121 and the third tube layer 123 in the second tube body 120, and the third tube body 130 are integrally formed by insert injection molding.

[0056] In another embodiment, Figure 7 As shown, there is a gap between the inner side of the first tube body 110 and the outer side of the second tube body 120, so that an annular cavity is formed between the first tube body 110 and the second tube body 120. The tube body 100 further includes a plurality of filling bodies 140, which are filled in the annular cavity, and the plurality of filling bodies 140 are arranged at intervals along the circumference of the tube body 100. The filling body 140 and at least one of the first tube body 110 and the second tube body 120 remain relatively stationary. The space between two adjacent filling bodies 140 constitutes a containing cavity 102. It can be understood that the filling body 140 can also be deformed under the action of the force applied by the target object 200.

[0057] In yet another embodiment, Figure 8 As shown, the inner side surface of the first tube body 110 and the outer side surface of the second tube body 120 are in contact with each other, and the first tube body 110 is provided with the accommodating cavity 102 .

[0058] The operation of performing interventional surgery using the medical catheter 10 provided by the embodiment of the present invention is as follows: first, partially introduce the tube body 100 into the blood vessel according to a conventional method, and make the distal end of the tube body 100 reach the target position. It should be understood that at this time, none of the accommodating cavities 102 is filled with the target object 200. Then, according to actual needs, at least part of the accommodating cavities 102 is filled with the target object 200, so that the outer side of the tube body 100 abuts against the blood vessel wall 1. Afterwards, the instrument is introduced into the blood vessel through the instrument channel 101 according to a conventional method.

[0059] The operation of withdrawing the medical catheter 10 is as follows: first withdraw the target object 200 from the accommodating cavity 102 , and then withdraw the tube body 100 from the body.

[0060] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A medical catheter, characterized in that: It includes a tube body and a target object; wherein, The tube body has an instrument channel extending through the tube body along its own axial direction; the tube body also has a plurality of accommodating cavities extending along its own axial direction, the plurality of accommodating cavities are arranged at intervals along the circumferential direction of the tube body and are located at the outer periphery of the instrument channel; the accommodating cavities are isolated from the instrument channel, and the accommodating cavities are used to accommodate the target object; The tube body comprises a first tube body and a second tube body, the second tube body is at least partially disposed in the first tube body, and the tube cavity of the second tube body constitutes the instrument channel; the elastic modulus of the second tube body is greater than the elastic modulus of the first tube body; the accommodating cavity is disposed on the first tube body, or the accommodating cavity is disposed between the first tube body and the second tube body; The target object is a support body, and the size of the cross section of the support body in a preset direction is larger than the size of the accommodating cavity in a natural state in the radial direction of the tube body; when the accommodating cavity accommodates the target object, the preset direction extends along the radial direction of the tube body; The medical catheter is configured such that when at least a portion of the accommodating cavity accommodates the target object, the target object applies a radially outward force to the wall of the tube body along the corresponding accommodating cavity, and causes a portion of the wall of the tube body located on a side of the accommodating cavity accommodating the target object away from the axis of the tube body to expand radially outward along the tube body.

2. The medical catheter according to claim 1, characterized in that: There is a gap between the inner side surface of the first tube body and the outer side surface of the second tube body; The tube body further includes a plurality of third tube bodies, which are arranged between the inner side surface of the first tube body and the outer side surface of the second tube body, and are arranged at intervals along the circumference of the medical catheter; the elastic modulus of the third tube body is smaller than the elastic modulus of the second tube body, and the tube cavity of each third tube body constitutes one accommodating cavity; The medical catheter is configured such that when at least one of the accommodating cavities accommodates the target object, the third tube body where the accommodating cavity accommodating the target object is located expands in its own radial direction, and the portion of the first tube body located at the third tube body accommodating the target object expands outward in the radial direction of the tube body.

3. The medical catheter according to claim 1, characterized in that: There is a gap between the inner side surface of the first tube body and the outer side surface of the second tube body; The tube body further comprises a plurality of filling bodies, which are filled between the first tube body and the second tube body at intervals along the circumferential direction of the tube body, and the space between two adjacent filling bodies constitutes one accommodating cavity.

4. The medical catheter according to claim 1, characterized in that: The inner circumference of the first tube body is in contact with the outer circumference of the second tube body, and the first tube body is provided with the accommodating cavity.

5. The medical catheter according to any one of claims 1 to 4, characterized in that: The second tube body includes a first tube layer, a second tube layer and a third tube layer which are sequentially arranged from the inside to the outside, and the second tube layer includes a metal layer.

6. The medical catheter according to claim 5, characterized in that The second tube layer includes a metal braided layer, and the metal braided layer is wrapped on the outer peripheral surface of the second tube layer.

7. The medical catheter according to claim 5, characterized in that The second tube layer includes a metal spiral spring structure, and the spiral spring structure is sleeved on the outer circumferential surface of the second tube layer.

8. The medical catheter according to claim 5, characterized in that The second tube layer is formed into an integral structure with the first tube layer and the second tube layer through an insert injection molding process.

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