CN213884691U - Micro-catheter - Google Patents

Abstract

The utility model is suitable for a medical instrument field provides a little pipe, locate the sacculus in the body outside including body and cover, the body has seal wire channel and inflation channel, link up the setting around the seal wire channel and pass through for the seal wire, inflation channel is used for giving the sacculus is aerifyd, the body is located the pipeline section of the front side of sacculus is the head end, the head end is around being equipped with an at least first spiral silk, each first spiral silk is along same spiral around establishing the direction and spirally winding and locating the outer tube surface of head end. The utility model provides a little pipe effectively improves the propelling movement power and the torsion of little pipe, makes little pipe change in to twist reverse the propelling movement and gos forward, promotes the success rate that little pipe passes through the CTO pathological change district.

Description

Micro-catheter

Technical Field

The utility model belongs to the field of medical equipment, especially, relate to a little pipe.

Background

Percutaneous Transluminal Coronary Angioplasty (PTCA) is the most basic and leading interventional technique for treating atherosclerotic coronary stenosis. The peripheral artery is punctured percutaneously, a catheter with a balloon is sent into the coronary artery to reach a narrow section, the balloon is expanded to enlarge a narrow lumen, and blood flow is smooth.

Existing microcatheters can be generally divided into single lumen microcatheters and double lumen microcatheters. The single-cavity micro catheter has small outer diameter and good trafficability, but when the single-cavity micro catheter passes through a Chronic Total Occlusion (CTO) lesion, the single-cavity micro catheter often shows weak supporting force, insufficient pushing force and insufficient torsion, thereby influencing the success rate of the micro catheter passing through the CTO lesion area; the double-lumen microcatheter has two guide wire lumens, can simultaneously insert two guide wires, reduces the replacement frequency of interventional devices, but still has the problem of insufficient pushing force and torque force when passing through Chronic Total Occlusion (CTO) lesions. In addition, no matter the single-cavity micro catheter or the double-cavity micro catheter, after the CTO lesion area is passed, the guide wire is usually required to be replaced to feed the dilatation balloon again, the interventional device is required to be replaced for many times, the operation time is long, and the operation cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough, provide a little pipe, it aims at solving the current little pipe propelling movement and the not enough problem of torsion, can reduce the change number of times and the use quantity of intervention apparatus simultaneously, and it is long when shortening the operation, reduce the operation expense.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

the utility model provides a microcatheter, includes body and the sacculus of cover locating the body outside that extends around, the body has seal wire channel and inflation channel, seal wire channel link up the setting around in order to supply the seal wire to pass through, inflation channel is used for giving the sacculus is aerifyd, the body is located the pipeline section of the front side of sacculus is the head end, the head end is around being equipped with at least one first spiral silk, each first spiral silk is along same around establishing the outside surface of direction spiral ground locating the head end.

Optionally, the first spiral wire is wound on the outer side surface of the head end in a right-handed rotation manner.

Optionally, the cross-sectional shape of the first spiral wire is circular, oval, square, triangular or trapezoidal.

Optionally, both ends of the first spiral wire are welded to the head end.

Optionally, the first spiral wire is welded to the head end along a winding path thereof.

Optionally, a second spiral wire is wound on the balloon, the second spiral wire is an elastic member, the second spiral wire can be elastically extended when the balloon is expanded and can be reset when the balloon is contracted, and the winding direction of the second spiral wire is the same as that of the first spiral wire.

Optionally, the second spiral wire covers the entire balloon in the extending direction of the guide wire channel.

Optionally, the first spiral wire and the second spiral wire are integrally arranged, and free ends of the first spiral wire and the second spiral wire are connected with the pipe body.

Optionally, the cross-sectional shape of the second spiral wire is circular, elliptical, square, triangular or trapezoidal

Optionally, the first spiral wire and/or the second spiral wire are made of stainless steel, platinum-iridium alloy, nickel-titanium alloy or high polymer material.

The utility model provides a little pipe can effectively improve the propelling movement power and the torsion of little pipe through the setting around establishing the first spiral silk at the head end, makes little pipe change in to twist reverse the propelling movement and gos forward, promotes the success rate that little pipe passes through the CTO pathological change district, and can pressurize the expansion to narrow pathological change region under the condition that need not put into sacculus pipe once more, reduces operation time and operation expense.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a first schematic view of a microcatheter according to an embodiment of the present disclosure;

fig. 2 is a second schematic view of a microcatheter according to an embodiment of the present disclosure.

Wherein, in the figures, the respective reference numerals:

10. a pipe body; 11. a head end; 20. a balloon; 31. a first spiral wire; 32. a second spiral wire; 101. a guidewire channel; 102. and an inflation channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "front," "back," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2, a microcatheter of the type provided herein is now illustrated. Referring to fig. 1, the microcatheter includes a tube 10 extending forward and backward and a balloon 20 sleeved outside the tube 10, the tube 10 has a guide wire channel 101 and an inflation channel 102, the guide wire channel 101 is disposed through the tube for the guide wire to pass through, and the inflation channel 102 is used for inflating the balloon 20.

The guide wire channel 101 and the inflation channel 102 are not communicated with each other.

The guide wire channel 101 is for the guide wire to pass through to cooperate with the surgical operation.

One end of the inflation channel 102 is communicated with the balloon 20, and the other end is externally connected with a pressure pump, when the balloon 20 enters the blood vessel along with the tube body 10, the balloon is in a contraction state attached to the outer surface of the tube body 10, and when reaching the CTO lesion area, air is pumped in by the pressure pump to expand, so that the tissue of the CTO lesion area is forced to be extruded towards the peripheral side to expand the aperture.

The tube section of the tube body 10 located at the front side of the balloon 20 is a head end 11, at least one first spiral wire 31 is wound on the head end 11, and the first spiral wire 31 is spirally wound on the outer tube surface of the head end 11 along the same winding direction. The same winding direction means that all the first spiral wires 31 are wound on the outer surface of the head end 11 in the right-handed or left-handed rotating direction.

When an operator uses the microcatheter to pass through a CTO lesion area, the first spiral wire 31 can improve the supporting force and the pushing force of the microcatheter, and when the operator twists along the same direction as the first winding direction (for example, the first spiral wire 31 is right-handed, and the operator twists the microcatheter right-handed), the first spiral wire 31 wound on the head end 11 can provide a track for the microcatheter to twist and spirally advance, so that the microcatheter is easier to twist and push forward, and the success rate of the head end 11 passing through the CTO lesion area is improved; after the sacculus 20 reaches the lesion area, the micro-catheter inflates the sacculus 20, the CTO lesion area can be directly dilated under the condition that a guide wire does not need to be replaced and an additional sacculus 20 catheter is arranged, the replacement frequency of an interventional device is reduced, and the convenience and the efficiency of operation are improved.

It should be noted that, because the head end 11 is a structure that the microcatheter reaches the CTO lesion area first, and the resistance is the greatest, the first spiral wire 31 is wound around the head end 11, compared with the case of winding around the other positions of the tube body 10, the puncture pressing effect of the microcatheter on the CTO lesion area can be enhanced more effectively, so that the success rate of the microcatheter passing through the CTO lesion area can be improved more favorably.

By the above, the micro-catheter provided by the embodiment of the application can effectively improve the pushing force and the torsion of the micro-catheter by winding the first spiral wire 31 arranged at the head end 11, so that the micro-catheter is easier to twist and push forwards, and the success rate of the micro-catheter passing through a CTO lesion area is improved. In addition, the utility model discloses can pressurize the expansion to narrow pathological change region under the condition that need not put into the sacculus pipe once more, reduce operation time and operation expense.

Preferably, when there are a plurality of first spiral wires 31, the first spiral wires 31 are equally spaced in the axial direction. The arrangement of the plurality of first spiral wires 31 is beneficial to improving the propelling efficiency of the micro-catheter.

In another embodiment of the present application, the first spiral wire 31 is wound on the outer surface of the head end 11 in a right-handed manner. The right-handed operation realizes the propulsion of the micro catheter and the left-handed operation realizes the exit of the micro catheter, which accords with the operation habit of the operator. The first spiral wire 31 is wound on the outer surface of the head end 11 in a right-handed manner, so as to facilitate the operation of the operator.

In another embodiment of the present application, referring to fig. 2, the balloon 20 is wound with a second spiral wire 32, the second spiral wire 32 is an elastic member capable of elastically extending when the balloon 20 expands and restoring when the balloon 20 contracts, and the winding direction of the second spiral wire 32 is the same as that of the first spiral wire 31.

The second spiral wire 32 is an elastic member that is elastically elongated when the balloon 20 is expanded and elastically restored when the balloon 20 is contracted. The arrangement is such that the second helical wire 32 is affixed to the surface of the balloon 20 at a relatively constant pitch whether the balloon 20 is in the expanded state or in the contracted state.

The second spiral wire 32 is arranged, firstly, in the process that the saccule 20 enters the CTO lesion area, the saccule 20 and the CTO lesion area move relatively, the second spiral wire 32 provides pushing force and torsion force for the saccule 20 to advance spirally, and the difficulty of the saccule 20 entering the CTO lesion area is reduced; secondly, in the process that the saccule 20 reaches the target position of the CTO lesion area and is inflated and expanded, the second spiral wire 32 is wound on the outer surface of the saccule 20 to achieve the effect of reinforcing the saccule 20, the angle is changed, the second spiral wire 32 protrudes out of the surface of the saccule 20, the pressure of the saccule 20 acts on the CTO lesion area through the second spiral wire 32, and compared with the process that the surface of the saccule 20 directly supports against the CTO lesion area, the pressure on the CTO lesion area can be increased, so that the expansion capacity of the CTO lesion area is improved; finally, the second spiral wire 32 is cut into the tissue of the CTO lesion area during the expansion of the balloon 20, and is engaged with the tissue of the CTO lesion area, so that the anti-slip effect is achieved.

It is to be understood that there are one or more of the second spiral wires 32, and when there are a plurality of the second spiral wires 32, the second spiral wires 32 are equally spaced in the axial direction.

In another embodiment of the present application, referring to fig. 2, the second spiral wire 32 covers the entire balloon 20 along the extension direction of the guide wire channel 101. In combination with the provision of the second spiral wire 32 as an elastic member, the second spiral wire 32 covers the entire balloon 20 such that the balloon 20 is uniformly stressed as a whole when expanded.

In another embodiment of the present application, the first spiral wire 31 and the second spiral wire 32 are integrally provided. The free ends of the first spiral wire 31 and the second spiral wire 32 are connected to the pipe body 10. Specifically, the free end of the first spiral wire 31 departing from the second spiral wire 32 is connected to the head end 11, and the free end of the second spiral wire 32 departing from the first spiral wire 31 is connected to the tube 10 behind the balloon 20.

For convenience of description, the integrated structure of the first spiral wire 31 and the second spiral wire 32 is made into an elastic wire. It is to be understood that, when there are a plurality of the first spiral wires 31, there are a plurality of the second spiral wires 32 connected to the first spiral wires 31 in a one-to-one correspondence, forming a plurality of elastic wires.

Two ends of the elastic wire are fixed on the tube body 10, and the elastic wire covers the balloon 20 and extends to part or all of the head end 11. Under the condition that both ends of the elastic wire are fixed, the winding number of turns and the winding position of the elastic wire are relatively fixed, and the thread pitch of the elastic wire is relatively fixed. The elastic wire is elastically elongated as a whole under the action of an external force, that is, the first spiral wire 31 and the second spiral wire 32 are elastically deformed together under the action of the external force. Specifically, when the balloon 20 is expanded, the first spiral wire 31 is elastically elongated by the tensile force of the second spiral wire 32, and the first spiral wire 31 extends to the region of the balloon 20. Under the condition that the expansion size of the balloon 20 is fixed, the arrangement can reduce the deformation amount of the second spiral wire 32, reduce the requirement on the elasticity of the second spiral wire 32, prolong the service life of the second spiral wire 32 and reduce the difficulty of expansion of the balloon 20 caused by the inward pressure from the second spiral wire 32 on the expansion of the balloon 20.

In other embodiments, the first spiral wire 31 and the second spiral wire 32 may be independently provided. The first spiral wire 31 is wound around the head end 11 and both end points are fixed to the head end 11 by welding. The first spiral wire 31 may be integrally fixed to the outer side of the head end 11 by an ultrasonic welding process to form a thread structure. In the case where the first spiral wire 31 and the second spiral wire 32 are provided independently, the first spiral wire 31 is not required to have elasticity.

In another embodiment of the present application, the cross-section of the first spiral wire 31/the second spiral wire 32 is circular, elliptical, square, triangular or trapezoidal. Preferably, the cross section of the first spiral wire 31 is an isosceles trapezoid or a rectangle with a long side abutting against the joint end 11. The second spiral wire 32 has an isosceles trapezoid or rectangle cross section with the long side abutting the balloon 20. The section is isosceles trapezoid or rectangle, and compared with the design of circle, semicircle or triangle, the propelling effect of precession micro-catheter operation is favorable to improving. The long side of the cross section of the first spiral wire 31 abuts against the head end 11, so that the relative fixation between the first spiral wire 31 and the head end 11 is improved, and the rotation of the first spiral wire 31 is reduced. The longer side of the cross section of the second spiral wire 32 abuts the balloon 20, which is advantageous for reducing the rotation of the second spiral wire 32 itself when the balloon 20 is expanded.

In another embodiment of the present application, the first spiral wire 31 and/or the second spiral wire 32 are made of stainless steel, platinum-iridium alloy, or nickel-titanium alloy. Stainless steel, platinum-iridium alloy or nickel-titanium alloy is selected, so that the structural strength and elasticity are good, and other metal materials or organic polymer materials can be adopted by a person skilled in the art, which is not limited herein.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims (10)

1. The utility model provides a microcatheter, its characterized in that, locates the sacculus in the body outside including the body that extends around with the cover, the body has seal wire channel and inflation channel, seal wire channel link up the setting around for the seal wire to pass through, inflation channel is used for aerifing the sacculus, the body is located the pipeline section of the front side of sacculus is the head end, the head end is around being equipped with at least one first spiral silk, each first spiral silk is along same winding direction spiral winding locate the outer tube surface of head end.

2. The microcatheter of claim 1, wherein said first helical wire is wound right-hand around an outer surface of said tip.

3. The microcatheter of claim 1, wherein the first helical wire has a cross-sectional shape that is circular, oval, square, triangular, or trapezoidal.

4. The microcatheter of claim 1, wherein both ends of said first spiral wire are welded to said tip.

5. The microcatheter of claim 1, wherein said first helical wire is welded to said tip along its winding path.

6. The microcatheter of any one of claims 1-3, wherein said balloon is wrapped with a second helical wire, said second helical wire being an elastic member capable of being elastically elongated when said balloon is expanded and reset when said balloon is contracted, said second helical wire being wrapped in the same direction as said first helical wire.

7. The microcatheter of claim 6, wherein said second helical wire covers the entire balloon along the extension of said guidewire channel.

8. The microcatheter of claim 6, wherein said first spiral wire and said second spiral wire are integrally formed, and wherein free ends of said first spiral wire and said second spiral wire are connected to said tubular body.

9. The microcatheter of claim 6, wherein the cross-sectional shape of said second helical wire is circular, oval, square, triangular or trapezoidal.

10. The microcatheter of claim 6, wherein the first and/or second helical wire is made of stainless steel, platinum iridium alloy, nickel titanium alloy, or a polymeric material.

Images