CN210144706U

CN210144706U - Thrombus aspiration catheter

Info

Publication number: CN210144706U
Application number: CN201821389006.2U
Authority: CN
Inventors: 徐荣; 傅堃; 张楚楚
Original assignee: Grace Pulse (shanghai) Medical Technology Co Ltd
Current assignee: Sino Medical Sciences Technology Inc
Priority date: 2018-08-27
Filing date: 2018-08-27
Publication date: 2020-03-17
Anticipated expiration: 2028-08-27

Abstract

The utility model discloses a thrombus suction catheter, including the pipe main part and with the elasticity pipe of pipe main part one end intercommunication, the one end that the pipe main part was kept away from to the elasticity pipe can curl to one side and form the head end, be provided with the through-hole on the elasticity pipe, the through-hole be located with the head end curls on opposite side of opposite direction and is close to the pipe main part, be provided with at least one suction hole in the pipe main part. According to an embodiment of the present disclosure, the utility model discloses simple structure, convenient operation. In addition, the blood vessel intima can be effectively protected, and the blood vessel can be prevented from being damaged when thrombus is removed.

Description

Thrombus aspiration catheter

Technical Field

The utility model belongs to the technical field of medical instrument, more specifically relates to a thrombus suction catheter.

Background

Thrombi are small patches of blood flow that form on the surface of a denuded or repaired site within a blood vessel of the cardiovascular system. In the variable fluid-dependent type, the thrombus is composed of insoluble fibrin, deposited platelets, accumulated white blood cells and entrapped red blood cells, and obstructions such as deposits, plaques and the like exist to form thrombus to block or interrupt blood flow, thereby causing local tissue necrosis to affect human health and even being life-threatening.

In the prior art, in order to solve the problem that thrombus blocks a blood vessel, a thrombus suction catheter is generally used in the prior art, the catheter is conveyed to a thrombus part along the blood vessel, negative pressure is directly given, thrombus is extracted, and the blood vessel reestablishes blood flow power. However, the thrombus aspiration catheter in the prior art has a complex structure and a complex operation process, and is usually a straight tube, so that the inner wall of a blood vessel can be scratched in the aspiration process. In addition, when some large thrombi are aspirated, the thrombi cannot be broken, and long-time aspiration is required, which increases the amount of blood to be aspirated, and is not good for the health of the patient. The existing thrombus aspiration catheter mostly adopts a double-cavity tube which is respectively an aspiration cavity and a guide wire cavity. The guidewire lumen of some thrombus aspiration catheters is located outside the aspiration lumen, resulting in an increase in the catheter cross-sectional area. The guide wire cavity of part of the thrombus suction catheter is positioned in the suction cavity, the radial cross-sectional area of the suction cavity is small, and the suction efficiency is low. The existing thrombus suction catheter is easy to face a vascular wall in the internal conveying process, thrombus can not be accurately sucked, and the suction efficiency is low.

Accordingly, there is a need for an improved thrombus aspiration catheter that addresses at least one of the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a thrombus aspiration catheter for pulmonary arteries, peripheral arteries, and the like.

According to the utility model discloses an aspect provides a thrombus suction catheter, including the pipe main part and with the elasticity pipe of pipe main part one end intercommunication, the one end that the pipe main part was kept away from to the elasticity pipe can curl to one side and form the head end, be provided with the through-hole on the elasticity pipe, the through-hole be located with the head end curls on the opposite side opposite in direction and is close to the pipe main part, be provided with at least one suction hole in the pipe main part.

Optionally, the diameter of the elastic tube is smaller than or equal to the diameter of the catheter main body, the elastic tube has the same diameter or the outer diameter of the elastic tube gradually decreases in the direction away from the catheter main body.

Optionally, the catheter body is a hollow single lumen body;

or a guide wire cavity is further arranged in the catheter main body and communicated with the elastic tube.

Optionally, the sidewall of the catheter body is of a single layer construction;

or the side wall of the catheter main body is of a multi-layer composite structure, the multi-layer composite structure comprises a reinforcing layer, and the reinforcing layer is of a metal wire woven structure.

Optionally, the catheter body material is made of at least one of PTFE, ETFE, Pebax, Nylon, FEP, PET, PEEK, TPU;

or the material for making the metal wire comprises at least one of nickel-titanium alloy, stainless steel, titanium alloy and cobalt-chromium alloy.

Optionally, the curl angle of the head end is 30 ° -720 °.

Optionally, the crimping diameter of the tip is larger than the radius of the catheter body, and the at least one suction hole is located on the same side of the thrombus aspiration catheter as the direction of crimping of the tip.

Optionally, the suction hole is provided with a beveled end face, and the angle of inclination of the beveled end face is 10-90 degrees.

Optionally, the suction hole has two opposing chamfered end faces thereon.

Optionally, the outer surface of the tip or/and catheter body is coated with a silicone rubber coating or a hydrophilic-based coating.

Optionally, the other end of the catheter main body is provided with a Y-shaped hemostatic valve, and one joint of the Y-shaped hemostatic valve is communicated with the negative pressure suction device.

Optionally, a flow regulating mechanism and a valve are further arranged between the Y-shaped hemostatic valve and the negative pressure suction device.

Optionally, the head end is made of a radiopaque polymeric material;

or one or more of the head end, the through hole and the two sides of the suction hole are provided with developing rings.

Optionally, the developing ring is made of at least one of a platinum alloy and a palladium alloy.

According to an embodiment of the present disclosure, the utility model discloses simple structure, convenient operation. In addition, the blood vessel intima can be effectively protected, and the blood vessel can be prevented from being damaged when thrombus is removed.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic external view of some embodiments.

Fig. 2 is a schematic diagram of the structure of the elastic tube in some embodiments.

Fig. 3 is a schematic structural diagram of other embodiments.

Fig. 4 is a partial structural schematic of some embodiments.

In the figure, 1 a catheter main body, 11 suction holes, 12 guide wire cavities, 13Y-shaped hemostatic valves, 2 elastic tubes, 21 head ends, 22 through holes, 23 straight tubes, 3 flow regulating mechanisms and 4 valves.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The utility model provides a thrombus aspiration catheter, as shown in figure 1-2, which comprises a catheter main body 1 and an elastic tube 2 communicated with one end of the catheter main body 1. When the catheter body 1 and the elastic tube 2 are penetrated by a guide wire, the elastic tube 2 follows the shape of the guide wire. After the guide wire is pulled away, one end of the elastic tube 2, which is far away from the catheter main body 1, can be curled to one side to form a head end 21, namely, one end of the elastic tube 2, which is far away from the catheter main body 1, is in a pigtail shape in a natural state, but can be straightened when being subjected to external force. The elastic tube 2 is provided with a through hole 22. The through hole 22 is located on the other side opposite to the curling direction of the head end 21 and close to the catheter main body 1, and the through hole 22 is used for enabling a guide wire to extend forwards through the through hole 22 after the head end 21 is formed, and then enabling the head end 21 to rotate around the guide wire. The through hole 22 may be circular or oval. At least one suction hole 11 is provided on the catheter body 1 for negative pressure suction.

When the utility model is used, the following steps can be included:

delivering a guidewire to a specified location in a blood vessel;

the thrombus aspiration catheter of the utility model is conveyed along the guide wire, so that the elastic tube is close to the thrombus;

withdrawing part of the guide wire to enable one end of the elastic tube far away from the catheter main body 1 to be curled into a pigtail shape;

pushing the guide wire out of the through hole 22;

slightly rotating the thrombus suction catheter by taking the guide wire as an axis, scattering a large-volume thrombus by using the head end, and sucking the thrombus through the suction hole;

after the suction is finished, the negative pressure suction of the suction hole is closed, and then the thrombus suction catheter is withdrawn.

The utility model discloses simple structure, convenient operation. In addition, the head end 21 can effectively protect the blood vessel intima and prevent the blood vessel from being damaged when the thrombus is removed. The setting of through-hole can make a head end seal wire is the axle, for head end 21 provides the support, improves the clearance efficiency of thrombus.

In some embodiments, as shown in fig. 1, further, the catheter body 1 may have a diameter of 1-10 mm. The catheter body 1 may be disposed coaxially with the flexible tube 2, or may be disposed non-coaxially with the flexible tube in some embodiments, which is not limited in this application. The diameter of the elastic tube 2 is smaller than or equal to the diameter of the catheter body 1. The front and back of the elastic tube 2 are equal in diameter; or the outer diameter of the elastic tube 2 is gradually reduced along the direction far away from the catheter main body 1, and the reduced outer diameter can reduce the resistance of the elastic tube 2 during the transportation in the blood vessel, thereby improving the transportation efficiency and the transportation effect.

In some embodiments, the catheter body 1 is a hollow single cavity, and a guide wire cavity is not separately arranged, so that the effective area of the cross section of the catheter body 1 can be larger, and the suction efficiency can be improved. Of course, in some other embodiments, as shown in fig. 3, a guide wire cavity 12 may also be further disposed in the catheter main body 1, and the guide wire cavity 12 is communicated with the elastic tube 2, so that the guide wire can penetrate into the elastic tube. Further, it may be only the elastic tube 2 which communicates with the guide wire lumen 12 of the catheter main body 1. The guidewire lumen 12 may or may not be concentric with the catheter body 1, as is intended and limited by the present application.

In some embodiments, the sidewall of the catheter body 1 may be a single layer structure integrally formed from a single material. Alternatively, the side wall of the catheter body 1 is a multi-layer composite structure. The multi-layer composite structure comprises a reinforcing layer which is a metal wire braided structure and can improve the conveying performance and the anti-bending capacity of the catheter main body 1. Further, the material of which the wire is made may include at least one of nickel titanium alloy, stainless steel, titanium alloy, cobalt chromium alloy, and the like. The material from which the catheter body 1 is made may comprise at least one of PTFE, ETFE, Pebax, Nylon, FEP, PET, PEEK, TPU, and the like.

In some embodiments, the curling angle of the head end 21 is 30 to 720 degrees, so that the head end 21 is curled to be located in the same plane, under the same condition, the diameter of the head end 21 is increased or certain structural strength of the head end 21 is enhanced by utilizing the same material to the maximum extent, and the efficiency of the head end 21 in thrombus breaking is improved.

In some embodiments, at least one of the suction holes 11 and the head end 21 are located on the same side of the thrombus suction catheter in the curling direction, and the curling diameter of the head end 21 is larger than the radius of the catheter main body 1, so that the suction holes 11 in the blood vessel can reduce the occurrence of blockage or damage to the blood vessel caused by the adhesion of the blood vessel wall, improve the suction efficiency and protect the blood vessel. In some embodiments, as shown in fig. 1, the suction holes 11 are close to the connecting position of the catheter main body 1 and the elastic tube 2, so that broken thrombus can be sucked away by the suction holes 11 as quickly as possible, which helps to improve the suction efficiency, and a sufficiently large space can be provided for the suction operation of the suction holes 11, which improves the suction efficiency.

In some embodiments, as shown in fig. 1 to 3, the suction hole 11 has a chamfered end surface, so that when the suction hole is obstructed by a blood vessel wall or the like, the suction can still be performed from the side, and the blood vessel wall is not directly adsorbed by negative pressure, so that the occurrence of injury is reduced. The angle of inclination of the chamfered end face may be 10 ° to 90 °. Further, the suction hole 11 may have two opposite chamfered end surfaces.

In some embodiments, the tip 21 and/or the outer surface of the catheter body 1 are coated with a silicone rubber coating or hydrophilic coating to reduce friction during delivery in the blood vessel, facilitate rapid delivery to a designated area, and improve surgical efficiency.

In some embodiments, the other end of the catheter body 1 is provided with a Y-shaped hemostatic valve 13, one connector of the Y-shaped hemostatic valve 13 is communicated with a negative pressure suction device, and the other connector is used for a guide wire to pass through. The negative pressure suction device is directly communicated with the suction hole 11 for suction. The negative pressure suction device can comprise an injector, a manual aspirator, a negative pressure air bag, an electric negative pressure machine and the like. Further, in some embodiments, as shown in fig. 4, a flow regulating mechanism 3 and a valve 4 are further disposed between the Y-shaped hemostatic valve 13 and the negative pressure suction device. The flow regulating mechanism 3 and the valve 4 are arranged on a connecting pipe between the Y-shaped hemostatic valve 13 and the negative pressure suction device. The flow rate adjusting mechanism 3 is used to control the suction speed of the suction hole 11, such as a roll clamp or the like. The valve is used for stopping the communication between the suction hole 11 and the negative pressure suction device and controlling the closing or opening of suction, such as a plug valve and the like.

In some embodiments, the head 21 is made of a radiopaque polymer material, which facilitates the observation of whether the head reaches a designated position and whether the head is curled during the operation by radiography, which helps to improve the success rate and efficiency of the operation.

In some embodiments, a developing ring is disposed on one or more of the head end 21, the through hole 22, and both sides of the suction hole 11. The developing ring can be fixed by means of pressing, gluing and the like. The developing ring can be made of at least one of platinum alloy, palladium alloy and other alloy materials.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. The utility model provides a thrombus aspiration catheter, its characterized in that, includes catheter main body and the elasticity pipe with catheter main body one end intercommunication, the one end that catheter main body was kept away from to the elasticity pipe can curl to one side and form the head end, be provided with the through-hole on the elasticity pipe, the through-hole be located with the head end curls on the opposite side of direction and is close to catheter main body, be provided with at least one suction hole on the catheter main body.

2. A thrombus aspiration catheter according to claim 1, wherein the diameter of the elastic tube is smaller than or equal to the diameter of the catheter main body, the elastic tube has a constant diameter or the outer diameter of the elastic tube becomes gradually smaller in a direction away from the catheter main body.

3. A thrombus aspiration catheter according to claim 1, wherein the catheter main body is a hollow single lumen body;

4. A thrombus aspiration catheter according to claim 1, wherein the side wall of the catheter main body is a single layer structure;

5. A thrombus aspiration catheter according to claim 1, wherein the crimp angle of the tip end is 30 ° -720 °.

6. A thrombus aspiration catheter according to claim 1, wherein the crimping diameter of the tip end is larger than the radius of the catheter body, and at least one of the suction holes is located on the same side of the thrombus aspiration catheter as the direction of crimping of the tip end.

7. A thrombus aspiration catheter according to claim 1, wherein the aspiration hole has a chamfered end face thereon, and the angle of inclination of the chamfered end face is 10 ° to 90 °.

8. A thrombectomy catheter according to claim 7, wherein said aspiration aperture has two opposing beveled end surfaces thereon.

9. A thrombectomy catheter according to claim 1, wherein an outer surface of said tip or/and catheter body is coated with a silicone rubber coating or a hydrophilic base coating.

10. A thrombus aspiration catheter according to claim 1, wherein the other end of the catheter main body is provided with a Y-shaped hemostatic valve, and one joint of the Y-shaped hemostatic valve is communicated with a negative pressure aspiration device.

11. A thrombus aspiration catheter according to claim 10, wherein a flow regulating mechanism and a valve are further provided between the Y-shaped hemostatic valve and the negative pressure aspiration device.

12. A thrombus aspiration catheter according to claim 1, wherein the tip is made of radiopaque polymeric material;