CN216167692U

CN216167692U - Catheter tube

Info

Publication number: CN216167692U
Application number: CN202122520068.0U
Authority: CN
Inventors: 刘庆龙; 刘云云; 林恒; 罗雪莉
Original assignee: Microport Neurotech Shanghai Co Ltd
Current assignee: Microport Neurotech Shanghai Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-04-05
Anticipated expiration: 2031-10-19

Abstract

The present invention provides a catheter, comprising: a catheter body including a grip; the surface roughness of the holding part is larger than that of other parts of the catheter body; the distance between the proximal end of the holding part and the nearest end of the catheter along the axial direction of the catheter body is 0-1800 mm. By the arrangement, the gripping part with larger surface roughness is arranged, so that the friction force between the fingers of the operator and the catheter is increased, the pressing force required to be exerted on the catheter by the operator can be reduced, the deformation damage of the pressing force to the catheter is reduced, and the collapse of the catheter is reduced. Further, the grip portion is disposed at a distance of 0mm to 1800mm from the proximal end of the catheter, without changing the structure of the distal portion of the catheter, and therefore without adversely affecting the flexibility and intended use of the catheter.

Description

Catheter tube

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a catheter.

Background

During interventional clinical procedures, surgeons often use catheters as a pathway for the interventional procedure. For example, in a thrombus aspiration procedure, the operator uses a catheter (e.g., an aspiration catheter or a guiding catheter) to aspirate the thrombus under negative pressure, such as direct aspiration of the thrombus or aspiration in combination with mechanical thrombus removal. After the catheter sucks the thrombus or the thrombus taking device anchors the thrombus, an operator combines the near end of the pulling catheter to pull the catheter and the thrombus from the lesion position together and takes out the thrombus. In the process, due to the combined action of the suction negative pressure and the pinching pressure of the fingers of the operator, the proximal end of the catheter may collapse, that is, the proximal end of the catheter is locally crushed and deformed, so that the suction process is interrupted, the thrombus escapes again, and other negative effects are caused, and the effectiveness and the safety of the suction embolus operation are further influenced. In other procedures, the catheter, such as a support catheter, a microcatheter, etc., used by the surgeon may collapse under the action of external force.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a catheter, which solves the problem that the existing catheter is easy to collapse when in use.

To solve the above technical problem, the present invention provides a catheter, comprising: a catheter body including a grip;

the surface roughness of the holding part is larger than that of other parts of the catheter body;

the distance between the proximal end of the holding part and the nearest end of the catheter along the axial direction of the catheter body is 0-1800 mm.

Optionally, the outer wall of the gripping portion is radially outwardly convex or concave.

Optionally, the holding portion includes a first concave-convex structure protruding outward or inward along a radial direction of the catheter body and connected to the outer wall of the catheter body; or the first concave-convex structure is formed by the outer wall of the catheter body protruding or recessed outwards in the radial direction.

Optionally, the first concave-convex structure is at least one of a point shape, a stripe shape, a ring shape and a spiral shape.

Optionally, the first concave-convex structure is integrally formed with the outer wall of the catheter body.

Optionally, the catheter body comprises an inner layer and an outer layer sleeved outside the inner layer.

Optionally, the catheter further comprises: a support portion;

the supporting part is arranged between the inner layer and the outer layer along the circumferential direction, and the axial position of the supporting part along the catheter body is matched with the axial position of the holding part along the catheter body.

Optionally, the supporting portion includes a tubular body and a second concave-convex structure; the second concave-convex structure is convexly connected to the outer wall of the tubular body along the radial direction of the tubular body.

Optionally, a portion of the outer layer wrapping the second concave-convex structure protrudes outward in a radial direction to form the holding portion.

Optionally, the tubular body is a rigid member.

In order to solve the above technical problem, the present invention also provides a catheter, comprising: the catheter comprises a catheter body and a holding part, wherein the holding part is detachably connected with the catheter body;

the surface roughness of the holding part is larger than that of the catheter body;

Optionally, the holding part is of a spiral structure, and the holding part is detachably spirally wound around the catheter body.

Optionally, the holding part includes a third concave-convex structure and an assembly body, the assembly body is circumferentially disposed around the catheter body, and the assembly body includes at least one axial notch; the inner wall of the assembly body is used for being connected with the catheter body, and the axial gap is used for the catheter body to penetrate through; the third concave-convex structure is formed by radially outward protruding or inward recessing of the outer wall of the assembly body.

Optionally, the assembly body includes at least two sub-assembly bodies, at least two sub-assembly bodies are circumferentially arranged around the catheter body, and at least two sub-assembly bodies are detachably connected to each other.

Optionally, the assembly body includes a structural layer and an inner liner, the inner liner is disposed at an inner side of the structural layer along a radial direction of the assembly body, and the inner liner is used for connecting with the catheter body; the inner liner is a flexible part, and the structural layer is a rigid part.

Optionally, the assembly body further includes a fourth concave-convex structure, and the fourth concave-convex structure is connected to the inner wall of the inner liner layer along the radial direction of the assembly body in a protruding manner

In summary, the present invention provides a catheter comprising: a catheter body including a grip; the surface roughness of the holding part is larger than that of other parts of the catheter body; the distance between the proximal end of the holding part and the proximal end of the catheter along the axial direction of the catheter body is 0-1800 mm. Or, the catheter provided by the utility model comprises a catheter body and a holding part, wherein the holding part is detachably connected with the catheter body; the surface roughness of the holding part is larger than that of the catheter body; the distance between the proximal end of the holding part and the nearest end of the catheter along the axial direction of the catheter body is 0-1800 mm.

With the configuration, the gripping part or the gripping part with larger surface roughness is arranged, so that the friction force between the fingers of the operator and the catheter is increased, the pressing force required to be exerted on the catheter by the operator can be reduced, the deformation damage of the catheter caused by the pressing force is reduced, and the collapse of the catheter is reduced. Further, the gripping portion or gripping member is positioned between 0mm and 1800mm from the proximal-most end of the catheter without altering the configuration of the distal portion of the catheter, and therefore without adversely affecting the flexibility and intended use of the catheter.

Drawings

It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the utility model and do not constitute any limitation to the scope of the utility model. Wherein:

FIG. 1 is a schematic axial cross-sectional view of a catheter according to a first embodiment of the present invention;

FIG. 2 is a schematic axial cross-sectional view of a catheter according to a second embodiment of the utility model;

FIG. 3 is a schematic view of a gripping member according to a third embodiment of the present invention;

FIG. 4 is a schematic view of a third embodiment of the utility model showing the gripping member and the catheter body before they are assembled;

fig. 5 is a schematic view of the holding member and the catheter body according to the third embodiment of the present invention after assembly.

In the drawings:

100-a catheter body; 110-an inner layer; 120-an outer layer; 130-an intermediate layer; 200-a grip portion; 210-a first relief structure; 220-a third relief structure; 230-assembly; 231-a connecting band; 232-buckling; 233-structural layer; 234-an inner liner; 235-a fourth relief structure; 236-subassembly; 240-a gripping member; 300-a support; 310-a tubular body; 320-a second relief structure.

Detailed Description

To further clarify the objects, advantages and features of the present invention, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.

As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or at least two of such features, the term "proximal" generally being the end near the operator, the term "distal" generally being the end near the patient, i.e. near the lesion, the terms "end" and "proximal" and "distal" generally referring to the corresponding two parts, which include not only the end points, the terms "mounted", "connected" and "connected" being to be understood in a broad sense, e.g. as being fixedly connected, as well as detachably connected, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. Furthermore, as used in the present invention, the disposition of an element with another element generally only means that there is a connection, coupling, fit or driving relationship between the two elements, and the connection, coupling, fit or driving relationship between the two elements may be direct or indirect through intermediate elements, and cannot be understood as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below or to one side of another element, unless the content clearly indicates otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The catheter provided by the present invention is described below in connection with several embodiments.

[ EXAMPLES one ]

Referring to fig. 1, a catheter according to an embodiment of the present invention includes: a catheter body 100, said catheter body 100 comprising a grip 200; the surface roughness of the grip 200 is greater than the surface roughness of the rest of the catheter body 100; the distance between the proximal end of the holding part 200 and the most proximal end of the catheter along the axial direction of the catheter body 100 is 0mm-1800 mm. Preferably, the distance between the proximal end of the holding part 200 and the most proximal end of the catheter along the axial direction of the catheter body 100 is between 0mm and 800 mm; more preferably, the proximal end of the grip 200 is located between 0mm and 300mm from the proximal-most end of the catheter in the axial direction of the catheter body 100. Optionally, the outer wall of the grip 200 is radially outwardly convex or concave.

Generally, the catheter body 100 has a smooth surface to facilitate movement through the blood vessel. The surface roughness of the grip 200 is relatively large, and for example, the grip may be provided with a convex or concave structure to improve the surface roughness.

With the configuration, the gripping part 200 with larger surface roughness is arranged, so that the friction force between the fingers of the operator and the catheter is increased, the pressing force required to be exerted on the catheter by the operator can be reduced, the deformation damage of the catheter caused by the pressing force is reduced, and the collapse of the catheter is reduced. Further, the grip 200 is positioned 0mm to 1800mm from the proximal end of the catheter without changing the configuration of the distal portion of the catheter, and therefore without adversely affecting the flexibility and intended use of the catheter.

Please refer to fig. 1, which is a schematic axial cross-sectional view of a catheter according to a first embodiment of the present invention. In the first embodiment of the present invention, the holding portion 200 includes a first concave-convex structure 210, and the first concave-convex structure 210 is convex or concave along the radial direction of the catheter body 100; or the first concave-convex structure 210 is formed by radially outwardly protruding or inwardly recessing the outer wall of the catheter body 100. The number of the first concave-convex structures 210 may be one or more. Here, the outward protrusion refers to a protrusion extending in a radial direction of the catheter body 100 away from the axial direction of the catheter body 100, and is directed to the upper and lower sides in fig. 1; the concave refers to a concave extending in the radial direction of the catheter body 100 toward the axial direction of the catheter body 100, and is toward the middle in fig. 1.

In some embodiments, the first concave-convex structure 210 is a convex structure additionally attached to the outer wall of the catheter body 100, and may be, for example, a convex structure adhered, welded or connected to the outer wall of the catheter body 100 by other connection methods. In other embodiments, the first concave-convex structure 210 may also be a convex structure formed by the outer wall of the catheter body 100 being convex in the radial direction, or a concave structure formed by the outer wall of the catheter body 100 being concave in the radial direction. The first concave-convex structure 210 increases the surface roughness of the grip 200, so that an operator can obtain enough friction force with a small pressing force to drive the catheter to move forward and backward in the axial direction during the gripping operation. It should be noted that in some embodiments, the first concave-convex structure 210 may include both a convex structure and a concave structure.

Optionally, the first concave-convex structure 210 is at least one of a point shape, a stripe shape, a ring shape and a spiral shape. It should be noted that the grip portion 200 includes a plurality of first concave-convex structures 210, and the shapes of the first concave-convex structures 210 may be the same or different, for example, all of the first concave-convex structures 210 may be in a dot shape, or a part of the first concave-convex structures 210 may be in a dot shape, and another part of the first concave-convex structures 210 may be in a stripe shape, and the shape of the plurality of first concave-convex structures 210 of the grip portion 200 may be arranged in combination according to actual needs by those skilled in the art. It should be noted that, since the first concave-convex structure 210 is a protrusion in some embodiments and a groove in other embodiments, the first concave-convex structure 210 in a dot shape should be understood as a protrusion, such as an arc-shaped protrusion with an arc-shaped cross section, or a recess, such as an arc-shaped recess. Similarly, the first concave-convex structure 210 has a stripe shape or a spiral shape and correspondingly includes linear protrusions or linear grooves. It should be understood that the dot-shaped, stripe-shaped, ring-shaped, and spiral first concave-convex structure 210 is only an exemplary example of the first concave-convex structure 210 and is not limited to the form of the first concave-convex structure 210.

Further, the plurality of first concave-convex structures 210 are circumferentially distributed around the catheter body 100, and the first concave-convex structures 210 may be circumferentially distributed in a certain angle range around the catheter body 100, or may be circumferentially distributed around the catheter body 100 over the whole catheter body 100. The plurality of first asperities 210 are preferably evenly distributed circumferentially around the catheter body 100. They may be regularly arranged or irregularly distributed. Optionally, the axial length of the grip 200 along the catheter body 100 is 10mm to 100mm, the concave-convex distance of the first concave-convex structure 210 (i.e., the radial distance between the top end of the protrusion or the bottom end of the recess of the first concave-convex structure 210 relative to the outer wall of the catheter body 100) is 0.05mm to 10mm, and the ratio of the concave-convex distance of the first concave-convex structure 210 to the wall thickness of the outer layer 120 is 0.1: 1-100: 1.

in some embodiments, the first concave-convex structure 210 is in a dot shape, and has a diameter of 0.05mm to 30 mm; in other embodiments, the first concave-convex structure 210 has a stripe shape, a ring shape, and a spiral shape, and a width (width of the finger stripe itself) of 0.05mm to 30mm, and the ratio of the axial length to the width of the stripe shape, the ring shape, and the spiral shape of the first concave-convex structure 210 itself is 1.1: 1-100: 1. preferably, the axial extension direction of the first uneven structure 210 in a stripe shape, a ring shape, and a spiral shape forms an angle of 0 to 180 ° with the axial direction of the catheter body 100. The distance between two adjacent first concave-convex structures 210 is 0.05 mm-30 mm.

In an alternative embodiment, the catheter body 100 comprises an inner layer 110 and an outer layer 120 covering the inner layer 110, the material of the inner layer 110 and/or the outer layer 120 is preferably a high molecular polymer, and the high molecular polymer includes but is not limited to at least one of Polyurethane (PU), polyamide-polyether block copolymer (Pebax), nylon, Polycarbonate (PC), polyvinyl chloride (PVC), Polyethylene (PE), Polystyrene (PS), polyether ether ketone (PEEK), Polyolefin (PO), Polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), Fluorinated Ethylene Propylene (FEP), High Density Polyethylene (HDPE), and Low Density Polyethylene (LDPE). In another embodiment, the catheter body 100 further comprises an intermediate layer 130 disposed between the inner layer 110 and the outer layer 120, wherein the inner layer 110 and the outer layer 120 can be polymer layers, the intermediate layer 130 can be a metal layer, and the intermediate layer 130 can be in a spiral or woven structure.

The material of the first concave-convex structure 210 may be the same as or different from the material of the outer layer 120, and the material of the first concave-convex structure 210 includes, but is not limited to, at least one of Polyurethane (PU), polyamide-polyether block copolymer (Pebax), nylon, Polycarbonate (PC), polyvinyl chloride (PVC), Polyethylene (PE), Polystyrene (PS), Polyetheretherketone (PEEK), Polyolefin (PO), Polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), Fluorinated Ethylene Propylene (FEP), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), silicone, and various steel materials (such as stainless steel or alloy steel), aluminum and its alloy, titanium and its alloy, cobalt-based alloy, copper and its alloy, zinc and its alloy, and magnesium and its alloy.

In some embodiments, the first relief structure 210 is integrally formed with the outer wall of the catheter body 100. For example, by integral extrusion through a corresponding die, or by injection molding through a corresponding die. In other embodiments, the first concave-convex structure 210 may be a protrusion that is separately adhered to the outer wall surface of the catheter body 100.

In other embodiments, the first concave-convex structure 210 can be formed by heat-shrinking a heat-shrinkable tube having a corresponding hollow shape, specifically, the heat-shrinkable tube with the hollow shape is sleeved on the outer layer 120 and heated. The heat shrinkable tube of the non-hollow portion is heat shrunk to press the outer layer 120, so that the radial dimension of the portion of the outer layer 120 pressed by the heat shrinkable tube is reduced and flattened. The outer layer 120 corresponding to the hollow-out portion of the heat shrinkable tube is not extruded, and the radial dimension does not change, and a protrusion is formed on the surface of the outer layer 120 extruded and shrunk by the heat shrinkable tube, so that the first concave-convex structure 210 is formed. Similarly, the first concavo-convex structure 210, which is shaped as a groove, may be formed by heat-shrinking a heat-shrinkable tube having a corresponding convex shape.

In an exemplary embodiment, the proximal end of the grip 200 (i.e. the first concave-convex structure 210 located at the most proximal end) is 200mm away from the most proximal end of the catheter body 100 along the axial direction of the catheter body, and the first concave-convex structure 210 is an arc-shaped bump which is randomly distributed over the circumferential surface of the catheter body 100. The axial length of the grip 200 is 30 mm. The protruding height of the arc-shaped salient point is 0.05mm, and the diameter of the arc-shaped salient point is 1 mm. In use, the pusher catheter is first used according to a conventional procedure, and after the distal portion of the catheter reaches the desired lesion, the grip 200 is located outside the patient. When the catheter is pushed or withdrawn forwards along the axis, the fingers of an operator can press the holding part 200 to push or pull the catheter forwards, the friction force between the catheter and the hands of the operator is increased through the arrangement of the holding part 200, the radial extrusion force required to be exerted on the catheter by the operator is reduced, and therefore collapse damage of the catheter is reduced.

[ example two ]

Please refer to fig. 2, which is a schematic axial cross-sectional view of a catheter according to a second embodiment of the present invention. The catheter provided by the second embodiment of the present invention is basically the same as the catheter of the implant provided by the first embodiment, and the description of the same parts is omitted, and only different points will be described below.

As shown in fig. 2, the catheter according to the second embodiment further includes a support portion 300; the supporting portion 300 is circumferentially disposed between the inner layer 110 and the outer layer 120, and an axial position of the supporting portion 300 along the catheter body 100 is matched with an axial position of the grip portion 200 along the catheter body 100. The axial position of the support portion 300 is matched with the axial position of the grip portion 200, which means that the support portion 300 and the grip portion 200 at least overlap in the axial direction of the catheter body 100. Preferably, the axial length of the support portion 300 is the same as the axial length of the grip portion 200, and both are located at the same position in the axial direction of the catheter body 100. It is understood that since the support portion 300 is located between the inner layer 110 and the outer layer 120, the support portion 300 is also located inside the grip portion 200. When the operator grips and presses the grip portion 200, the support portion 300 can radially support the grip portion 200. Radial damage to the catheter is reduced or avoided.

Optionally, the supporting portion 300 includes a tubular body 310, and the tubular body 310 may be a circumferentially complete tubular body, or may be a tubular hollow grid body, a spring net, a woven net, or a cutting tube with a corresponding shape, which is not limited in this embodiment. Preferably, the tubular body 310 is a rigid member, which is understood herein to have a certain stiffness and structural support properties, such as a modulus of elasticity above 1.0 GPa. More specifically, the tubular body 310 may be made of metal, such as various steel materials (e.g., stainless steel or alloy steel), aluminum and its alloy, titanium and its alloy, cobalt-based alloy, copper and its alloy, zinc and its alloy, magnesium and its alloy, and high molecular polymer with a high melting point, such as Polyetheretherketone (PEEK), Polytetrafluoroethylene (PTFE), etc.

Preferably, the support 300 further includes a second concave-convex structure 320; the second concave-convex structure 320 is outwardly protruded from the outer wall of the tubular body 310 in the radial direction of the tubular body 310. The shape of the second concave-convex structure 320 may be the same as or different from the shape of the first concave-convex structure 210. Further, a portion of the outer layer 120 wrapping the second concave-convex structure 320 is radially outwardly convex to form the grip 200.

Referring to fig. 2, in an exemplary embodiment, the second concave-convex structure 320 is a rounded rectangular parallelepiped bump randomly distributed over the entire circumferential surface of the tubular body 310, the protruding height of the second concave-convex structure 320 (i.e. the radial distance between the top end of the protrusion of the second concave-convex structure 320 and the outer wall of the tubular body 310) is 1.4mm, and the length and width of the second concave-convex structure 320 itself are 8mm and 4mm, respectively. The axial length of the tubular body 310 along the catheter body 100 is 50mm, the axial length of the grip portion 200 formed by the outer layer 120 wrapping the tubular body 310 is also 50mm, and the distance between the proximal end of the tubular body 310 and the proximal-most end of the catheter is 300 mm. Preferably, the material of the tubular body 310 is 304 stainless steel, and the material of the second concave-convex structure 320 is also 304 stainless steel.

It should be noted that, in some embodiments, the grip 200 may include a convex portion formed by the outer layer 120 wrapping the second concave-convex structure 320 and the first concave-convex structure 210 as described in the first embodiment.

[ EXAMPLE III ]

Referring to fig. 3 to 5, fig. 3 is a schematic view of a holding member according to a third embodiment of the present invention;

FIG. 4 is a schematic view of a third embodiment of the utility model showing the gripping member and the catheter body before they are assembled; fig. 5 is a schematic view of the holding member and the catheter body according to the third embodiment of the present invention after assembly. The catheter provided in the third embodiment of the present invention is basically the same as the catheter provided in the first embodiment, and the description of the same portions will not be repeated, and only different points will be described below.

An embodiment provides a catheter comprising: a catheter body 100 and a holding member 240, wherein the holding member 240 is detachably connected to the catheter body 100; the gripping member 240 has a surface roughness greater than that of the catheter body 100; the distance between the proximal end of the holding part 240 and the proximal end of the catheter along the axial direction of the catheter body 100 is 0mm-1800 mm. Preferably, the distance between the proximal end of the holding part 200 and the most proximal end of the catheter along the axial direction of the catheter body 100 is between 0mm and 800 mm; preferably, the proximal end of the gripping member 200 is located between 0mm and 300mm from the proximal-most end of the catheter in the axial direction of the catheter body 100. It should be noted that the holding member 240 is detachably connected to the catheter body 100, so in theory, the holding member 240 may be installed at any position of the catheter body 100, preferably at the proximal end which is easily collapsed; meanwhile, because the holding part 240 is detachable from the catheter body 100, after the catheter body 100 is pushed to the proper position, the holding part 240 can be separated from the catheter body 100, when the catheter body 100 needs to be retracted, the holding part 240 is reconnected with the catheter body 100, and the use of the catheter body 100 can not be affected when the catheter body 100 is not pushed or retracted.

The gripping member 240 may be assembled with the catheter body 100 when desired, and so configured, existing aspiration or guide catheters may be utilized without modification to the catheter body 100.

Optionally, in an alternative embodiment, the holding member 240 has a spiral structure, and the holding member 240 is detachably spirally wound on the catheter body 100.

Referring to fig. 3 to 5, in another embodiment, the holding member 240 includes a third concave-convex structure 220 and an assembly body 230, the assembly body 230 is circumferentially disposed around the catheter body 100, and the assembly body 230 includes at least one axial notch; the inner wall of the assembly body 230 is used for connecting with the catheter body 100, and the axial gap is used for the catheter body 100 to pass through; the third concave-convex structure 220 is formed by radially outwardly protruding or inwardly recessing the outer wall of the assembly body 230. The number of the third concave-convex structures 220 may be one, or may be multiple, and the embodiment is not limited thereto. The shape of the third concave-convex structure 220 may be the same as or different from that of the first concave-convex structure 210, and reference may be made to the above description about the first concave-convex structure 210, which is not repeated here. When the fitting body 230 is assembled with the catheter body 100, the catheter body 100 may be inserted through the axial gap, so that the fitting body 230 is connected with the catheter body 100.

Preferably, the assembly body 230 comprises at least two sub-assembly bodies 236, at least two sub-assembly bodies 236 are arranged circumferentially around the catheter body 100, and at least two sub-assembly bodies 236 are used for being detachably assembled and connected with each other. Alternatively, the overall external shape of the assembly 230 formed by assembling and connecting at least two sub-assemblies 236 to each other includes, but is not limited to, a cylinder, a cuboid, a cube, a cone, or an ellipsoid. The sub-assemblies 230 can be detachably connected together by means of bayonet, knob or adhesive, and the tightness of the assembly can be adjusted according to the outer diameter of the catheter body 100.

In an exemplary embodiment, the holding member 240 includes two sub-assemblies 236, the two sub-assemblies 236 are connected to each other in a fitting manner, and have an overall outer contour that is approximately cylindrical, one side of each of the two sub-assemblies 236 is connected to the other side of the two sub-assemblies 236 by a connecting band 231, and the other sides of the two sub-assemblies 236 are detachably connected to each other by a snap 232. After the snap 232 of the two sub-assemblies 236 are engaged with each other, as shown in fig. 5, the inner wall of the formed assembly 230 is attached to the outer wall of the catheter body 100, and the assembly 230 can limit the axial movement of the catheter body 100. By grasping and manipulating the fitting body 230, the axial forward and backward movement of the catheter body 100 can be driven.

Optionally, the sub-assembly 236 of the holding member 240 has a cavity therein, which is partially or completely through along the axial direction after being assembled and connected, and the cavity is used for accommodating the catheter body 100. It will be appreciated that the lumen has an inner diameter sized to match the outer diameter of the catheter body 100, for example, the lumen has an inner diameter sized to equal the outer diameter of the catheter body 100, or the lumen has an inner diameter sized slightly smaller than the outer diameter of the catheter body 100. The inner diameter of the cavity is preferably 0.5 mm-5 mm, and the length of the cavity is preferably 5 mm-200 mm.

Optionally, the assembly body 230 includes a structural layer 233 and an inner liner 234, the inner liner 234 is disposed inside the structural layer 233 along a radial direction of the assembly body 230, and the inner liner 234 is configured to be connected to the catheter body 100; the inner liner 234 is a flexible member and the structural layer 233 is a rigid member. The inner liner 234 is a flexible member herein and is understood to have some elastic deformability, such as a material with an elastic modulus below 0.1 GPa. Preferably, the flexible member is made of a polymer material, including but not limited to: silicone, Polyolefins (PO) such as Polyethylene (PE) or polypropylene (PP), thermoplastic elastomers (TPE) such as Thermoplastic Polyurethane (TPU), Thermoplastic Polyamides (TPA) or polyamide polyether block copolymers (Pebax). Preferably, the flexible member has a Shore hardness of 30A-80D. Structural layer 233 is a rigid member that is understood to have a certain stiffness and structural support properties, such as an elastic modulus above 1.0 GPa. Preferably, the material of the structural layer 233 is metal, such as various steel materials (e.g., stainless steel or alloy steel), aluminum and its alloy, titanium and its alloy, cobalt-based alloy, copper and its alloy, zinc and its alloy, magnesium and its alloy, etc.; in addition, the material of the structural layer 233 may be selected from rigid plastics such as Polycarbonate (PC), polyvinyl chloride (PVC), Polyethylene (PE), Polystyrene (PS), Polyetheretherketone (PEEK), Polyolefin (PO), Polytetrafluoroethylene (PTFE), polyethylene terephthalate (PET), Fluorinated Ethylene Propylene (FEP), and the like. The structural layer 233 mainly provides support for the assembly 230, and when an operator holds the assembly 230 pressing the holding part 240, the structural layer 233 can play a role of radial support, so as to reduce or avoid radial damage of the catheter. The lining layer 234 is a flexible member, and when connected to the catheter body 100, the lining layer 234 can be extruded by the structural layer 233 to generate a certain deformation, so as to increase the friction force between the lining layer and the catheter body 100, so that the assembly body 230 can reliably drive the catheter body 100 to move in the axial direction when moving in the axial direction.

Further, the assembly body 230 further includes a fourth concave-convex structure 235, and the fourth concave-convex structure 235 is connected to the inner wall of the inner liner 234 in a protruding manner in the radial direction of the assembly body 230. Here, the inward projection means a projection extending in the radial direction of the fitting body 230 toward the axial direction of the catheter body 100, that is, a projection toward the center of the cavity of the fitting body 230. Due to the arrangement of the fourth concave-convex structure 235, the friction coefficient between the assembly body 230 and the catheter body 100 is further improved, and the axial connection reliability between the assembly body 230 and the catheter body 100 is improved. The fourth concave-convex structure 235 is also preferably a flexible member, and the material thereof may be a polymer material. The shape of the fourth concave-convex structure 235 may be the same as or different from the shape of the first concave-convex structure 210, and reference may be made to the description regarding the first concave-convex structure 210.

In an alternative example, the holding member 240 includes two sub-assemblies 236, the axial length of the sub-assembly 236 is 40mm, the two sub-assemblies 236 are coupled to each other to form a substantially cylindrical overall outer contour with an outer diameter of 8mm, and the material of the structural layer 233 is 316 stainless steel. The third concave-convex structure 220 is a stripe-shaped protrusion, and the length, width and height of the stripe-shaped protrusion are 8mm × 1mm × 0.6mm, respectively. The direction of distribution of the striated protrusions (i.e., the direction of extension of the striations themselves) makes an angle of 90 ° with the axial direction of the catheter body 100. The distance between adjacent stripe-shaped protrusions is 2mm, and the stripe-shaped protrusions are arranged in a staggered manner along the axial direction of the sub-assembly 236 to fill the entire outer surface of the sub-assembly 236. After the two sub-assemblies 236 are coupled together, the inner diameter of the cavity formed therein matches the outer diameter of the catheter, such as 2 mm. The cavity is through the sub-assembly 236 in the axial direction, i.e. the axial length of the cavity is also 40 mm. The material of inner liner 234 is silica gel, and the material of fourth concave-convex structure 235 is the same with the material of inner liner 234, and the shape of fourth concave-convex structure 235 is the punctiform arch, and it can be the internal surface of random distribution in inner liner 234. Optionally, the fourth concave-convex structure 235 is integrally formed with the inner liner 234.

In summary, the present invention provides a catheter comprising: a catheter body including a grip; the surface roughness of the holding part is larger than that of other parts of the catheter body; the distance between the proximal end of the holding part and the nearest end of the catheter along the axial direction of the catheter body is 0-1800 mm. Or, the catheter provided by the utility model comprises a catheter body and a holding part, wherein the holding part is detachably connected with the catheter body; the surface roughness of the holding part is larger than that of the catheter body; the distance between the proximal end of the holding part and the nearest end of the catheter along the axial direction of the catheter body is 0-1800 mm.

With the configuration, the gripping part or the gripping part with larger surface roughness is arranged, so that the friction force between the fingers of the operator and the catheter is increased, the pressing force required to be exerted on the catheter by the operator can be reduced, the deformation damage of the catheter caused by the pressing force is reduced, and the collapse of the catheter is reduced. Further, the gripping portion or member is positioned between 0mm and 1800mm from the proximal end of the catheter without altering the configuration of the distal portion of the catheter, thereby not adversely affecting the flexibility and intended use of the catheter.

It should be noted that, several of the above embodiments may be combined with each other. The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims

1. A catheter, comprising: a catheter body including a grip;

2. The catheter of claim 1, wherein the outer wall of the gripping portion is radially outwardly convex or concave.

3. The catheter according to claim 1, wherein the grip portion comprises a first concave-convex structure which is convex or concave in a radial direction of the catheter body; or the first concave-convex structure is formed by the outer wall of the catheter body protruding or recessed outwards in the radial direction.

4. The catheter of claim 3, wherein the first relief structure is at least one of point-like, stripe-like, annular, and helical.

5. A catheter as recited in claim 3, wherein the first relief structure is integrally formed with an outer wall of the catheter body.

6. The catheter of claim 1, wherein the catheter body comprises an inner layer and an outer layer disposed about the inner layer.

7. The catheter as claimed in claim 6, further comprising: a support portion;

8. The catheter of claim 7, wherein the support portion comprises a tubular body and a second relief structure; the second concave-convex structure is convexly connected to the outer wall of the tubular body along the radial direction of the tubular body.

9. The catheter of claim 8, wherein the portion of the outer layer surrounding the second concave-convex structure is radially outwardly convex to form the gripping portion.

10. The catheter of claim 8, wherein the tubular body is a rigid member.

11. A catheter, comprising: the catheter comprises a catheter body and a holding part, wherein the holding part is detachably connected with the catheter body;

12. The catheter of claim 11, wherein the gripping member is a helical structure, the gripping member being removably helically wound around the catheter body.

13. The catheter of claim 11, wherein the gripping member comprises a third relief structure and an assembly body disposed circumferentially about the catheter body, the assembly body comprising at least one axial indentation; the inner wall of the assembly body is used for being connected with the catheter body, and the axial gap is used for the catheter body to penetrate through; the third concave-convex structure is formed by radially outward protruding or inward recessing of the outer wall of the assembly body.

14. The catheter as claimed in claim 13, wherein the fitting body comprises at least two sub-fitting bodies, at least two of the sub-fitting bodies being arranged circumferentially around the catheter body, at least two of the sub-fitting bodies being adapted for mutually detachable fitting connection.

15. The catheter of claim 13 or 14, wherein the assembly body comprises a structural layer and an inner liner layer, the inner liner layer is arranged on the inner side of the structural layer along the radial direction of the assembly body, and the inner liner layer is used for being connected with the catheter body; the inner liner is a flexible part, and the structural layer is a rigid part.

16. The catheter of claim 15, wherein the assembly further comprises a fourth relief structure that is connected to an inner wall of the inner liner layer in a radially inward projection of the assembly.