Catheter structure

Abstract

The invention relates to the technical field of interventional medical instruments, and provides a catheter structure which comprises a catheter body and a cutter. A tube body; two ends of the tube body are respectively a near end and a far end; the tube body comprises an elastic cutting section located at the far end of the tube body and a containing cavity formed in the cutting section and used for containing an expander. And the cutter is arranged on the outer surface of the cutting section.

Description

Technical Field

[0001] The present invention belongs to the technical field of interventional medical devices, and more specifically, relates to a catheter structure. Background Art

[0002] Vascular interventional catheters are essential instruments for vascular interventional diagnosis and treatment. They belong to a special type of medical catheters with high scientific and technological content and technical requirements. There are many types of vascular interventional catheters, including microcatheters, guide catheters, balloon catheters, intermediate catheters, etc. Usually, several different types of vascular interventional catheters are used in combination in a vascular interventional procedure. In interventional surgery, intravascular catheters provide a stable pathway for other interventional instruments, making it easier for the instruments to reach designated locations in the blood vessels. They are used in all types of vascular interventional treatments and have a wide range of uses.

[0003] Percutaneous transluminal angioplasty (PTA) refers to percutaneous puncture of blood vessels, inserting a balloon dilatation catheter through an intravascular catheter, dilating the diseased blood vessels and improving blood flow in the narrowed parts of the blood vessels. In some calcified or fibrotic vascular lesions, it is difficult for ordinary balloon dilatation catheters to dilate the lesions to restore blood flow, and the restenosis rate is high.

[0004] Among them, the balloon catheter can refer to the balloon in (Chinese Utility Model Patent; Publication Number: CN211132630U; Subject Name: Balloon Catheter; Publication Date: 2020-07-31). Summary of the invention

[0005] The object of the present invention is to provide a catheter structure to solve the technical problem in the prior art that it is difficult to dilate the blood vessels to restore the blood flow by dilating the lesions with a balloon catheter.

[0006] To achieve the above object, the technical solution adopted by the present invention is to provide a catheter structure, comprising:

[0007] The tube body has two ends, a proximal end and a distal end respectively; the tube body comprises: a cutting section located at the distal end of the tube body and having elasticity, and a receiving cavity disposed in the cutting section and used for placing the expander;

[0008] as well as,

[0009] Cutter; the cutter is arranged on the outer surface of the cutting section.

[0010] Furthermore, it also includes: an expander that can expand in volume, and the expander is arranged in the accommodating cavity.

[0011] Furthermore, the expander is a balloon.

[0012] Furthermore, it also includes: a delivery channel arranged in the tube body; the delivery channel extends from the proximal end to the cutting section, and the delivery channel is connected with the accommodating cavity; the expander can move along the delivery channel before expansion.

[0013] Furthermore, the cutter is arranged around the outer surface of the cutting section.

[0014] Furthermore, the delivery channel is a hole in the tube body.

[0015] Furthermore, the cutter comprises: a metal mesh laid and fixed on the surface of the cutting section and capable of being stretched open by the cutting section.

[0016] Furthermore, the metal mesh is: a mesh tube sleeved and fixed on the outer surface of the cutting section; when the cutting section is in a contracted state, the mesh tube is assembled into a cylindrical shape; when the cutting section is in an expanded state stretched by the expander, the metal mesh expands into a mesh with mesh holes.

[0017] Furthermore, when the inner wall of the net cylinder is in close contact with the outer wall of the cutting section.

[0018] Furthermore, when the cutting section is in a contracted state, the mesh tube is in the shape of a cylindrical tube or a spindle-shaped tube.

[0019] Furthermore, the cutter is an integral piece made of any one or more materials selected from the group consisting of shape memory material, stainless steel, and nickel-titanium metal.

[0020] Furthermore, the cutter comprises: a metal wire extending along the cutting section and wound around the outer surface of the cutting section.

[0021] Furthermore, the metal wire is in a spiral shape.

[0022] Furthermore, the metal wire is wound around the outer side of the cutting section for multiple turns.

[0023] Furthermore, the cutting section is an integral piece made of elastic polymer material.

[0024] Furthermore, the cutting section is an integral piece made of any one or more of shape memory material, nylon elastomer, polyurethane, and silicone.

[0025] Furthermore, a development mark is provided at the distal end.

[0026] Furthermore, the distal end is made of soft polyurethane or polyamide, and / or the outer surface of the distal end is smooth and streamlined.

[0027] Furthermore, the tube body also includes: a guide section located between the proximal end and the cutting section; the proximal end is connected to the cutting section through the guide section; and the delivery channel passes through the proximal end, the guide section and the cutting section in sequence.

[0028] Furthermore, the guide section includes: an inner cylinder, an outer cylinder sleeved outside the inner cylinder, and a reinforcement layer; the reinforcement layer is located between the inner cylinder and the outer cylinder; and the conveying channel passes through the inner space of the inner cylinder.

[0029] Furthermore, the inner cylinder is an integral part made of any one or more of high-density polyethylene, polytetrafluoroethylene or polyimide;

[0030] The reinforcement layer is an integral piece made of any one or more materials selected from stainless steel, nickel-titanium and tungsten;

[0031] The outer cylinder is an integral piece made of one or more materials including nylon, polyamide, polyurethane and polyolefin.

[0032] Furthermore, the inner cylinder, the outer cylinder, and the reinforcement layer can be connected by any one of the following first connection method, second connection method, third connection method, and fourth connection method;

[0033] The first connection method: the inner cylinder, the outer cylinder, and the reinforcement layer are welded together by hot melting;

[0034] The second connection method: the inner cylinder and the reinforcement layer are connected by hot melting, and the reinforcement layer is embedded inside the outer cylinder;

[0035] The third connection method: the outer cylinder is connected to the reinforcement layer by hot-melt connection, and the inner cylinder is embedded inside the reinforcement layer;

[0036] The fourth connection method is as follows: the outer cylinder is embedded on the outer side of the reinforcement layer, and the inner cylinder is embedded on the inner side of the reinforcement layer.

[0037] Furthermore, the hardness of the outer cylinder gradually increases in the extending direction from the cutting section toward the proximal end.

[0038] Furthermore, the guiding section comprises a metal rod and a connecting section, wherein the connecting section connects the metal rod and the cutting section respectively; and a hydrophilic coating or a hydrophobic coating is provided on the surface of the metal rod.

[0039] Furthermore, one end of the connecting section is provided with an inclined surface which is inclined relative to the extending direction of the tube body; and the inclined surface is provided with an entrance which is connected with the conveying channel.

[0040] Furthermore, the metal rod may be an integral piece made of any one or more of stainless steel, nickel titanium or tungsten metal materials.

[0041] Furthermore, in the extending direction from the cutting section to the proximal end, the hardness of the guiding section gradually increases.

[0042] Furthermore, it also includes a catheter seat, which is connected to the proximal end.

[0043] Furthermore, the catheter seat and the guide section are connected by UV glue or thermosetting glue.

[0044] Furthermore, the catheter seat is an integral piece made of any one or more materials selected from the group consisting of hard polycarbonate and polyurethane.

[0045] Furthermore, it also includes: a stress relief tube, one end of which is sleeved on the proximal end, and the other end of which is arranged on the catheter seat.

[0046] Furthermore, the stress relief tube is an integral piece made of any one or more materials selected from polyurethane elastomer, polyolefin or polyethylene elastomer.

[0047] Furthermore, the stress relief tube includes: a hollow cone and a hollow cylinder; in the extension direction of the tube body from the distal end to the proximal end, the outer diameter of the hollow cone gradually increases; the hollow cone is connected to the proximal end, and the hollow cylinder is connected to the catheter seat.

[0048] The beneficial effects of the catheter structure provided by the present invention are as follows: compared with the prior art, the catheter structure provided by the present invention has a proximal end and a distal end at both ends of the tube body, and the distal end can be inserted into the blood vessel, and after the distal end enters the blood vessel, the tube body can be guided into the blood vessel; the tube body has a cutting section, and the cutting section is located on the distal end; the cutting section is elastic; the cutting section has a receiving cavity, and an expander can be provided in the receiving cavity; when the expander is provided in the receiving cavity, the cutting section can be expanded during the expansion of the expander volume; a cutter is provided on the outer surface of the cutting section, and during the expansion of the cutting section, the cutter can move radially outward along the cutting section, and during the movement of the cutter toward the radial outside of the cutting section, the external objects to be cut that hinder the blood flow (external objects to be cut: such as calcified (and / or fibrotic) blood vessels, cysts) can be cut, thereby improving and restoring the blood flow condition in the blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 A schematic front view of a catheter structure provided by an embodiment of the present invention;

[0051] Figure 2 A schematic front view of a distal end, a cutting section and a cutter provided in an embodiment of the present invention;

[0052] Figure 3 A schematic diagram of a cutting section after expansion provided by an embodiment of the present invention;

[0053] Figure 4 for Figure 1 Middle AA section view;

[0054] Figure 5 for Figure 2 Middle BB section view;

[0055] Figure 6 A schematic cross-sectional view of a catheter structure provided by an embodiment of the present invention;

[0056] Figure 7 A schematic diagram of a catheter structure provided by an embodiment of the present invention in which the cutter is a spiral line;

[0057] Figure 8 A schematic front view of a catheter structure provided by an embodiment of the present invention using a connecting section and a metal rod;

[0058] Fig. 9 A schematic diagram of the installation of the expander provided in an embodiment of the present invention.

[0059] Among them, the reference numerals in the figure are:

[0060] 1-tube body; 11-proximal end; 12-distal end; 13-cutting section; 14-guiding section; 141-inner cylinder; 142-outer cylinder; 143-reinforcement layer; 144-connecting section; 145-metal rod; 15-delivery channel; 2-cutter; 3-expander; 4-catheter seat; 5-stress relief tube; 51-hollow cone; 52-hollow cylinder; 6-dilator. DETAILED DESCRIPTION

[0061] It should be noted that the specific embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0062] It should be noted that, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. Among them, A and B can be singular or plural respectively.

[0063] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" or "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. When an element is referred to as being "fixed on" or "set on" another element, it may be directly on the other element or indirectly on the other element.

[0064] It should be noted that the directions or positional relationships indicated by terms such as “length”, “width”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0065] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0066] It should be noted that the term "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0067] Please also read Figures 1 to 6 The catheter structure provided by the present invention is now described. The catheter structure includes: a tube body 1 and a cutter 2; the two ends of the tube body 1 are respectively a proximal end 11 and a distal end 12; the tube body 1 includes: a cutting section 13 located at the distal end 12 of the tube body 1 and having elasticity and a receiving cavity 131 disposed in the cutting section 13 and used to place the expander 3; the cutter 2 is disposed on the outer surface of the cutting section 13.

[0068] In this way, the two ends of the tube body 1 are respectively the proximal end 11 and the distal end 12, and the distal end 12 can be inserted into the blood vessel. After the distal end 12 enters the blood vessel, the tube body 1 can be guided into the blood vessel; the tube body 1 has a cutting section 13, and the cutting section 13 is located on the distal end 12; the cutting section 13 is elastic; the cutting section 13 has a receiving cavity 131, and the receiving cavity 131 can be provided with an expander 3; when the expander 3 is provided in the receiving cavity 131, the cutting section 13 can be expanded during the volume expansion of the expander 3; a cutter 2 is provided on the outer surface of the cutting section 13, and the cutter 2 can move radially outward along the cutting section 13 during the expansion of the cutting section 13. During the movement of the cutter 2 toward the radial outside of the cutting section 13, the external objects to be cut that hinder the blood flow (external objects to be cut: such as calcified (and / or fibrotic) blood vessels, cysts) can be cut, thereby improving and restoring the blood flow condition in the blood vessel.

[0069] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, it also includes: an expander 3 that can expand in volume, and the expander 3 is arranged in the accommodating chamber 131. In this way, the cutting section 13 has elasticity; the cutting section 13 has an accommodating chamber 131, and the expander 3 can be arranged in the accommodating chamber 131, and the cutting section 13 can expand during the volume expansion of the expander 3; a cutter 2 is arranged on the outer surface of the cutting section 13, and the cutter 2 can move radially outward along the cutting section 13 during the expansion of the cutting section 13. During the movement of the cutter 2 to the radial outside of the cutting section 13, the external objects to be cut that hinder the blood flow (external objects to be cut: such as calcified (and / or fibrotic) blood vessels, capsules) can be cut, thereby improving and restoring the blood flow condition in the blood vessels.

[0070] For further information, see Figures 1 to 6 As a specific implementation of the catheter structure provided by the present invention, the expander 3 is a balloon.

[0071] In one embodiment, the balloon can be expanded by injecting liquid or gas. In one embodiment, the balloon further comprises: a supply source communicated with the balloon; the supply source provides liquid (or gas) to the balloon.

[0072] Please also read Figures 1 to 6The catheter structure provided by the present invention is now described. The catheter structure includes: a tube body 1, an expander 3 that can expand in volume, and a cutter 2; the tube body 1 includes: a proximal end 11, a distal end 12, a cutting section 13 located between the proximal end 11 and the distal end 12 and having elasticity, and a receiving cavity 131 located in the cutting section 13; the expander 3 is arranged in the receiving cavity 131; and the cutter 2 is arranged on the outer surface of the cutting section 13. In this way, the two ends of the tube body 1 are respectively the proximal end 11 and the distal end 12, and the distal end 12 can be inserted into the blood vessel. After the distal end 12 enters the blood vessel, the tube body 1 can be guided into the blood vessel; the tube body 1 has a cutting section 13, and the cutting section 13 is located between the proximal end 11 and the distal end 12; the cutting section 13 is elastic; the cutting section 13 has a accommodating cavity 131, and the accommodating cavity 131 is provided with an expander 3, and the cutting section 13 can be expanded during the volume expansion of the expander 3; a cutter 2 is provided on the outer surface of the cutting section 13, and the cutter 2 can move radially outward along the cutting section 13 during the expansion of the cutting section 13. During the movement of the cutter 2 toward the radial outside of the cutting section 13, the external objects to be cut that hinder the blood flow (external objects to be cut: such as calcified (and / or fibrotic) blood vessels, cysts) can be cut, thereby improving and restoring the blood flow condition in the blood vessel.

[0073] In one embodiment, the "proximal end 11" referred to in the present application refers to the end closer to the user operator, and the "distal end 12" refers to the end farther from the user operator. In one embodiment, the distal end 12 is inserted into the blood vessel, and the proximal end 11 is exposed outside the blood vessel.

[0074] In one embodiment, the cutter 2 is a blade.

[0075] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, it also includes: a delivery channel 15 arranged in the tube body 1; the delivery channel 15 extends from the proximal end 11 to the cutting section 13, and the delivery channel 15 is connected with the accommodating cavity 131; the expander 3 can move along the delivery channel 15 before expansion. In this way, the delivery channel 15 extends from the proximal end 11 to the accommodating cavity 131 of the cutting section 13; the expander 3 can move along the delivery channel 15 before expansion, and the user can deliver the expander 3 from the delivery channel 15 of the proximal end 11 to the accommodating cavity 131 of the cutting section 13.

[0076] In one embodiment, the feed opening of the delivery channel 15 is located at the proximal end 11 .

[0077] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the cutter 2 is arranged around the outer surface of the cutting section 13. In this way, the cutter 2 surrounding the cutting section 13 can cut the object to be cut in different radial directions outward of the cutting section 13.

[0078] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the delivery channel 15 is a hole in the tube body 1. In this way, the structure is simple.

[0079] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the cutter 2 includes: a metal mesh laid and fixed on the surface of the cutting section 13 and can be stretched open by the cutting section 13. In this way, after the metal mesh is stretched open, the metal mesh contacts the object to be cut and can destroy the object to be cut.

[0080] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the metal mesh is: a mesh tube that is sleeved and fixed on the outer surface of the cutting section 13; when the cutting section 13 is in a contracted state, the mesh tube is assembled into a cylindrical shape; when the cutting section 13 is in an expanded state stretched by the expander 3, the metal mesh expands into a mesh with mesh holes. In this way, when the cutting section 13 is in a contracted state, the cylindrical mesh tube can improve the permeability of the metal mesh in the blood vessel; after the cutting section 13 becomes an expanded state, the metal mesh unfolds into a mesh with mesh holes, and the mesh metal mesh can be cut after contacting the object to be cut; as for how the metal mesh cuts the object to be cut, when the metal mesh expands radially outward along the cutting section 13, the metal mesh can be squeezed into the object to be cut (outside the metal mesh) to cut the object to be cut.

[0081] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, when the inner wall of the net tube is close to the outer wall of the cutting section 13, the contact between the net tube and the cutting section 13 is closer.

[0082] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, when the cutting section 13 is in a contracted state, the mesh tube is in the shape of a cylindrical tube or a spindle-shaped tube.

[0083] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the cutter 2 is an integral piece made of any one or more materials selected from shape memory material, stainless steel, and nickel-titanium metal. In this way, the cutter 2 can return to its original shape more quickly after deformation.

[0084] In one embodiment, the shape memory material is a shape memory metal.

[0085] In one embodiment, the shape memory material can return to its original shape after electricity is passed through the wire.

[0086] For further information, see Figures 1 to 6As a specific embodiment of the catheter structure provided by the present invention, the cutter 2 includes: a metal wire extending along the cutting section 13 and wound on the outer surface of the cutting section 13. In this way, it is very convenient to install the cutter 2, and it is only necessary to wind the metal wire on the outer surface of the cutting section 13; the expansion device 3 can expand the cutting section 13 during the expansion process; the metal wire can be moved radially outward along the cutting section 13 during the expansion process of the cutting section 13, and the metal wire can be moved radially outward to the cutting section 13 during the movement of the metal wire radially outward to the cutting section 13. The external objects to be cut that hinder the blood flow (external objects to be cut: such as calcified (and / or fibrotic) blood vessels, capsules) can be cut during the movement of the metal wire radially outward to the cutting section 13, thereby improving and restoring the blood flow condition in the blood vessels; as for how the metal wire cuts the objects to be cut, when the metal wire moves radially outward along the cutting section 13, the metal wire can be squeezed into the objects to be cut (outside the metal wire) to cut the objects to be cut.

[0087] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the metal wire is in a spiral shape. In this way, it is more convenient to wind the metal wire around the cutting section 13.

[0088] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the metal wire is wound multiple times around the outside of the cutting section 13. In this way, the object to be cut can be cut at multiple positions on the metal wire.

[0089] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the cutting section 13 is an integral piece made of elastic polymer material. In this way, the cutting section 13 can recover to its original shape more quickly after deformation.

[0090] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the cutting section 13 is an integral piece made of any one or more of shape memory material, nylon elastomer, polyurethane, and silicone. In this way, the elasticity is good.

[0091] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, a developing mark is provided at the distal end 12. Thus, it is convenient for the user to identify the position of the distal end 12. In one embodiment, the developing mark can be developed under X-ray.

[0092] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the distal end 12 is made of soft polyurethane or polyamide, and / or the outer surface of the distal end 12 is smooth and streamlined. In this way, the distal end 12 has good elasticity and good passability along the pipeline.

[0093] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the tube body 1 further includes: a guide section 14 located between the proximal end 11 and the cutting section 13; the proximal end 11 is connected to the cutting section 13 through the guide section 14; and the delivery channel 15 passes through the proximal end 11, the guide section 14 and the cutting section 13 in sequence. In this way, the tube body 1 on the side of the guide section 14 close to the proximal end 11 can move under the guidance of the guide section 14.

[0094] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the guide section 14 includes: an inner cylinder 141, an outer cylinder 142 sleeved outside the inner cylinder 141, and a reinforcing layer 143; the reinforcing layer 143 is located between the inner cylinder 141 and the outer cylinder 142; the delivery channel 15 passes through the inner space of the inner cylinder 141. In this way, the guide section 14 adopts a multi-layer design with better toughness, and the reinforcing layer 143 can enhance the mechanical strength of the guide section 14.

[0095] In one embodiment, the reinforcing layer 143 is composed of any one or more of metal wire, metal wire winding, weaving, and laser cutting mesh. In one embodiment, the metal wire, metal wire winding, and weaving are round wires. In one embodiment, the metal wire, metal wire winding, and weaving are flat wires. In one embodiment, multiple parallel wires are arranged to change the hardness of the guide section 14 by changing the winding density, weaving density, or cutting density.

[0096] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the inner cylinder 141 is an integral piece made of any one or more of high-density polyethylene, polytetrafluoroethylene or polyimide. In this way, the friction coefficient is low.

[0097] In one embodiment, the reinforcement layer 143 is an integral piece made of any one or more materials selected from the group consisting of stainless steel, nickel-titanium, and tungsten.

[0098] In one embodiment, the outer cylinder 142 is a one-piece member made of one or more materials such as nylon, polyamide, polyurethane and polyolefin, so that the friction coefficient is low.

[0099] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the inner cylinder 141, the outer cylinder 142, and the reinforcement layer 143 can be connected by any one of the following first connection method, second connection method, third connection method, and fourth connection method.

[0100] In one embodiment, the first connection method is that the inner cylinder 141, the outer cylinder 142, and the reinforcing layer 143 are welded together by hot melting. In this way, it is very convenient to fix the inner cylinder 141, the outer cylinder 142, and the reinforcing layer 143.

[0101] In one embodiment, the second connection method is: the inner cylinder 141 and the reinforcing layer 143 are connected by heat melting, and the reinforcing layer 143 is embedded inside the outer cylinder 142. In this way, it is very convenient to fix the inner cylinder 141, the outer cylinder 142 and the reinforcing layer 143.

[0102] In one embodiment, the third connection method is: the outer cylinder 142 is connected to the reinforcing layer 143 by hot-melt connection, and the inner cylinder 141 is embedded inside the reinforcing layer 143. In this way, it is very convenient to fix the inner cylinder 141, the outer cylinder 142 and the reinforcing layer 143.

[0103] In one embodiment, the fourth connection mode is as follows: the outer cylinder 142 is embedded on the outer side of the reinforcing layer 143, and the inner cylinder 141 is embedded on the inner side of the reinforcing layer 143. In this way, it is very convenient to fix the inner cylinder 141, the outer cylinder 142 and the reinforcing layer 143.

[0104] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the hardness of the outer cylinder 142 gradually increases in the extending direction from the cutting section 13 to the proximal end 11. In this way, the outer cylinder 142 is not easily deformed during the process of the stress of the proximal end 11 being transmitted to the distal end 12.

[0105] For further information, see Figure 8 As a specific embodiment of the catheter structure provided by the present invention, the guide section 14 includes a metal rod 145 and a connecting section 144, and the connecting section 144 connects the metal rod 145 and the cutting section 13 respectively; the surface of the metal rod 145 is provided with a hydrophilic coating or a hydrophobic coating. In this way, the user can easily move the guide section 14 along the blood vessel through the metal rod 145; the hydrophilic coating or the hydrophobic coating on the surface of the metal rod 145 can be selected according to actual needs.

[0106] In one embodiment, the metal rod 145 may be a rod of equal diameter, or the metal rod 145 may be a rod of reduced diameter.

[0107] For further information, see Figure 8 As a specific embodiment of the catheter structure provided by the present invention, one end of the connecting section 144 is provided with an inclined surface inclined relative to the extension direction of the tube body 1; an inlet connected to the delivery channel 15 is provided on the inclined surface. In this way, the expander 3 can enter the delivery channel 15 through the inlet, and the existence of the inclined surface facilitates the inclined surface to enter or be withdrawn from the blood vessel.

[0108] For further information, see Figure 8 As a specific embodiment of the catheter structure provided by the present invention, the metal rod 145 can be an integral piece made of any one or more materials selected from stainless steel, nickel titanium or tungsten metal materials.

[0109] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the hardness of the guide section 14 gradually increases in the extending direction from the cutting section 13 to the proximal end 11. In this way, when the stress is transmitted from the proximal end 11 to the distal end 12 and passes through the guide section 14, the stress is more effectively transmitted along the guide section 14.

[0110] For further information, see Figures 1 to 6 As a specific implementation of the catheter structure provided by the present invention, it also includes a catheter seat 4, which is connected to the proximal end 11.

[0111] In one embodiment, the catheter adapter 4 has a hole. In one embodiment, the expander 3 can enter the delivery channel 15 through the hole on the catheter adapter 4.

[0112] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the catheter seat 4 and the guide section 14 are connected by UV glue or thermosetting glue. In this way, it is very convenient to fix the catheter seat 4 and the guide section 14.

[0113] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the catheter seat 4 is an integral piece made of any one or more materials selected from hard polycarbonate or polyurethane.

[0114] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, it also includes: a stress relief tube 5, one end of the stress relief tube 5 is sleeved on the proximal end 11, and the other end of the stress relief tube 5 is arranged on the catheter seat 4. In this way, the stress between the catheter seat 4 and the proximal end 11 can be transmitted through the stress relief tube 5.

[0115] For further information, see Figures 1 to 6 As a specific embodiment of the catheter structure provided by the present invention, the stress relief tube 5 is an integral piece made of any one or more materials selected from polyurethane elastomer, polyolefin or polyethylene elastomer. In this way, the elasticity is good.

[0116] For further information, see Figures 1 to 6As a specific embodiment of the catheter structure provided by the present invention, the stress relief tube 5 includes: a hollow cone 51 and a hollow cylinder 52; in the extension direction of the tube body 1 from the distal end 12 to the proximal end 11, the outer diameter of the hollow cone 51 gradually increases; the hollow cone 51 is connected to the proximal end 11, and the hollow cylinder 52 is connected to the catheter seat 4. In this way, it is convenient for the stress relief tube 5 to enter the blood vessel.

[0117] In one embodiment, the hollow cone 51 and the hollow cylinder 52 are an integral structure.

[0118] In one embodiment, a hydrophilic material may be coated on the surface of the metal rod 145 to form a coating, or a hydrophobic material may be coated on the surface of the metal rod 145 to form a hydrophobic coating; or, a layered structure made of a hydrophilic material may be coated on the outside of the metal rod 145 to form a hydrophilic coating; or, a layered structure made of a hydrophobic material may be coated on the outside of the metal rod 145 to form a hydrophobic coating.

[0119] In one embodiment, see Fig. 9 , further comprising: a dilator 6. In this way, the dilator 6 can be inserted at the entrance of the blood vessel to expand the entrance of the blood vessel, so that the tube body 1 enters the blood vessel through the input hole inside the dilator 6.

[0120] In one embodiment, the catheter structure further includes: a guide wire and a dilator; the guide wire can pass through the dilator and the tube body 1 in sequence, and the guide wire passes through the accommodating cavity 131. In this way, the guide wire can guide the tube body 1 and the dilator into the blood vessel.

[0121] In one embodiment, the tubular body 1 and the dilator are assembled together for use.

[0122] In one embodiment, the catheter sheath can be used to enter the blood vessel first, and then the catheter body 1 and the dilator can be guided by the guide wire and enter the blood vessel through the catheter sheath.

[0123] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A catheter structure, characterized in that: include: tube body; The two ends of the tube body are respectively a proximal end and a distal end; the tube body comprises: a cutting section located at the distal end of the tube body and having elasticity, and a receiving cavity arranged in the cutting section and used for placing the expander; as well as, Cutter; the cutter is arranged on the outer surface of the cutting section.

2. The catheter structure according to claim 1, characterized in that: Also includes: An expander capable of expanding volume is disposed in the accommodating chamber.

3. The catheter structure according to claim 2, characterized in that: The expander is a balloon.

4. The catheter structure according to claim 1, characterized in that: Also includes: A delivery channel is arranged in the tube body; the delivery channel extends from the proximal end to the cutting section, and the delivery channel is communicated with the accommodating cavity; the expander can move along the delivery channel before expansion.

5. The catheter structure according to claim 1, characterized in that: The cutter is disposed circumferentially on the outer surface of the cutting section.

6. The catheter structure according to claim 1, characterized in that: The cutter comprises: a metal mesh which is laid and fixed on the surface of the cutting section and can be stretched open by the cutting section.

7. The catheter structure according to claim 6, characterized in that: The metal mesh is a mesh tube mounted and fixed on the outer surface of the cutting section; when the cutting section is in a contracted state, the mesh tube is assembled into a cylindrical shape; when the cutting section is in an expanded state opened by the expander, the metal mesh expands into a mesh with mesh holes.

8. The catheter structure according to claim 1, characterized in that: The cutter includes a metal wire extending along the cutting section and wound around an outer surface of the cutting section.

9. The catheter structure according to claim 8, characterized in that: The metal wire is in a spiral shape; the metal wire is wound around the outer side of the cutting section for multiple turns.

10. The catheter structure according to claim 4, characterized in that: The tube body further comprises: a guide section located between the proximal end and the cutting section; the proximal end is connected to the cutting section via the guide section; and the delivery channel passes through the proximal end, the guide section and the cutting section in sequence.

11. The catheter structure according to claim 10, characterized in that: The guide section comprises: an inner cylinder, an outer cylinder sleeved outside the inner cylinder, and a reinforcement layer; the reinforcement layer is located between the inner cylinder and the outer cylinder; and the conveying channel passes through the inner space of the inner cylinder.

12. The catheter structure according to claim 10, characterized in that: The guide section comprises a metal rod and a connecting section, wherein the connecting section connects the metal rod and the cutting section respectively; a hydrophilic coating or a hydrophobic coating is provided on the surface of the metal rod; The metal rod can be an integral piece made of any one or more materials selected from stainless steel, nickel titanium or tungsten metal materials.

13. The catheter structure according to claim 12, characterized in that: One end of the connecting section is provided with an inclined surface which is inclined relative to the extending direction of the tube body; and the inclined surface is provided with an entrance which is connected with the conveying channel.

14. The catheter structure according to claim 10, characterized in that: The hardness of the guiding section gradually increases in an extending direction from the cutting section to the proximal end.

15. The catheter structure according to any one of claims 1 to 14, characterized in that: Also included is a catheter seat connected to the proximal end.

Images