CN111134784A

CN111134784A - Thrombus cutter

Info

Publication number: CN111134784A
Application number: CN202010076112.0A
Authority: CN
Inventors: 吉训明; 张学敏; 张巧玉; 卢军; 郑建良; 王涛; 张旭志; 扬晓林; 赵宇; 张学改
Original assignee: Beijing Hong Hai Minimally Invasive Technology Co Ltd
Current assignee: Beijing Hong Hai Minimally Invasive Technology Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-05-12
Anticipated expiration: 2040-01-22
Also published as: CN111134784B

Abstract

The invention discloses a thrombus cutter. The key point is that a cutting part consisting of a plurality of elastic cutting wires (3) is fixedly connected between a front end head (1) and a rear end head (2) of the thrombus cutter, wherein the front end head and the rear end head are provided with through holes, and each cutting wire (3) is provided with a vertex angle part (4) which plays a role in cutting thrombus. The rotary cutting device can cut thrombus along the axial direction of the blood vessel and can rotate to cut thrombus, and has excellent safety and cutting reliability.

Description

Thrombus cutter

The technical field is as follows:

the invention relates to a key device of a medical instrument, in particular to a thrombus cutter in a thrombus taking device in a human blood vessel.

Background art:

in blood vessels in the human body, thrombosis, such as thrombosis of the arterial/venous system caused by various causes, is frequently generated, and when the medical treatment is difficult to control the above-mentioned diseases, the thrombosis needs to be broken and taken out by using a medical instrument. One of the thrombus taking instruments used at present is to utilize a hollow catheter to extend into a thrombus formation part in a blood vessel, and then utilize a suction device to suck thrombus into a catheter and output the thrombus out of the body, but when the thrombus formation time is long, the thrombus hardness is large, the thrombus is difficult to suck into the catheter by the thrombus sucking catheter, and the other is to utilize a bowl-shaped thrombus taking guide wire to cut and break the thrombus, but the bowl-shaped thrombus taking guide wire also cannot effectively cut and break harder thrombus, and because the blood vessel wall of a human body is very thin, the hard penetrating object is difficult to be used to cut the thrombus, so the effective cutting or breaking of the harder thrombus still has a problem which is not really solved in medical treatment. Thus, providing a safe and reliable thrombus cutter remains a problem to be solved.

The purpose of the invention is as follows:

the invention aims to disclose a safe and reliable cutter for cutting thrombus in a human blood vessel.

The technical solution for realizing the invention is as follows: the thrombus cutter is characterized in that a cutting part consisting of a plurality of elastic cutting wires is fixedly connected between the front end head and the rear end head of the thrombus cutter, wherein the front end head and the rear end head of the thrombus cutter are provided with through holes, and each cutting wire is provided with a top corner part which plays a role in cutting thrombus.

The adjacent cutting wires are arranged at equal intervals, and the vertex angle parts of the cutting wires are distributed at equal intervals with the front end head.

The adjacent cutting wires are arranged at equal intervals, one of the vertex angle parts of the two adjacent cutting wires is close to the front end, and the other is close to the rear end.

The two adjacent cutting wires are arranged in a crossed mode, the vertex angle part of one cutting wire is close to the front end head, and the vertex angle part of the other cutting wire arranged in a crossed mode is close to the rear end head.

The two cutting wires which are mutually crossed are mutually wound for at least one circle at the crossed position.

The distance from the vertex of the vertex part close to the front end to the connecting line between the front end and the rear end is smaller than the distance from the vertex of the vertex part close to the rear end to the connecting line between the front end and the rear end.

The thrombus cutter has a unique design structure, namely, the cutter formed by the metal wire has certain rigidity by using the flexible metal wire and utilizing the unique structural design, can cut thrombus along the axial direction of the blood vessel and can rotate to cut the thrombus, and has excellent safety and cutting reliability.

Description of the drawings:

FIG. 1 is a schematic structural diagram of a thrombus extractor according to the present invention.

Fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the embodiment shown in fig. 1 in a use state.

Fig. 4 is a schematic structural diagram of the embodiment shown in fig. 1, which is retracted in the use state.

The specific implementation mode is as follows:

the embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be noted that the embodiments of the present invention are given for comprehensive understanding of the technical spirit of the present invention and should not be construed as limiting the scope of the claims of the present invention.

Referring to fig. 1 to 4, a technical solution of an embodiment of the present invention is: a cutting part consisting of a plurality of elastic cutting wires 3 is fixedly connected between a front end head 1 and a rear end head 2 of the thrombus cutter, wherein the front end head and the rear end head are provided with through holes, and each cutting wire 3 is provided with a top corner part 4 which plays a role in cutting thrombus. As shown in figure 1, the thrombus collecting device is arranged on a catheter 6 of the thrombus taking device, a through hole with the front and the rear ends (1, 2) of a thrombus cutter penetrates through the catheter 6, a thrombus collector 7 is arranged in front of the through hole, when the thrombus cutter enters the blood vessel of the human body along with the catheter 6 and is unfolded to form the state shown in figures 1-4, the thrombus taking device is operated to enable the thrombus cutter to move and rotate back and forth along with the catheter 6, the cutting wire 3 of the thrombus cutter cuts thrombus, the unfolding degree of the thrombus cutter is changed by operating the thrombus taking device, i.e. the aforementioned distance between apex 4 and duct 6, varies, when the aforementioned distance is smaller, the cutting can be performed by a thrombus cutter which is inserted or placed inside the thrombus, and in fact, the apex portion 4 performs the cutting of the thrombus, and the obliquely placed cutting wires 3 on both sides of the apex portion 4 also perform the cutting of the thrombus.

The thrombus cutter is provided with a plurality of cutting wires 3, adjacent cutting wires 3 are arranged at equal intervals, namely, the connecting line of the front end head (1) and the rear end head (2) is used as an axis, the adjacent cutting wires 3 are arranged at equal included angles, the technical significance is the same, the apical angle parts 4 of all the cutting wires 3 are distributed at equal intervals (not shown in the figure) with the front end head 1, namely, all the apical angle parts 4 are positioned on the circumference of one point on the catheter 6, for example, the thrombus is cut from one end face of a blood vessel, and the surface of the end face of the thrombus is cut in the advancing and rotating processes. The adjacent cutting wires 3 are arranged at equal intervals or at equal included angles, one apical angle part 4 of each two adjacent cutting wires 3 is close to the front end head 1, and the other apical angle part 4 is close to the rear end head 2 (shown in figures 1 to 4), so that the thrombus cutter has two annularly distributed apical angle parts 4 arranged at two positions, and is suitable for cutting from the end part of thrombus and also suitable for cutting in the inside of thrombus.

Two adjacent cutting wires 3 in the thrombus cutter are arranged in a crossed manner, the vertex angle part 4 of one cutting wire 3 is close to the front end head 1, the vertex angle part 4 of the other cutting wire 3 arranged in a crossed manner is close to the rear end head 2, a small included angle is formed between the cutting wire 3 and the axis, namely when the thrombus cutter is pushed forwards and backwards and pulled back, the cutting wire 3 has axial and oblique acting force on thrombus, and thus the cutting effect is better; in fact, when the cutting wire 3 in the above state is pushed, pulled or rotated, the cutting wire 3 is subjected to the reaction force of the thrombus on the cutting wire 3, so that the cutting wire 3 is deformed to a certain extent under the reaction force, especially the hard thrombus formed for a long time, the deformation of the cutting wire 3 is larger, because the rigidity of the cutting wire 3 is increased, the two cutting wires 3 which are arranged to cross each other are mutually wound for at least one circle at the crossing position 5, when the cutting wire 3 is received, the friction force between the two cutting wires 3 is increased due to the winding of the cutting wire 3 at the crossing position, that is, the two cutting wires 3 can resist the acting force applied by the thrombus together, so that the rigidity of the cutting wire 3 is improved, and the thrombus cutting effect is improved.

In order to further improve the thrombus cutting effect of the thrombus cutter, the distance between the vertex close to the vertex angle part 4 of the front end head 1 and the connecting line between the front end head (1) and the rear end head (2) is less than the distance between the vertex close to the vertex angle part 4 of the rear end head 2 and the connecting line between the front end head (1) and the rear end head (2), in common, the vertex angle part 4 close to the front end head 1 is short, and the vertex angle part 4 close to the rear end head 2 is high, so that when the thrombus cutter is pushed, the vertex angle part 4 close to the front end head 1 is firstly cut and goes deep into thrombus, the vertex angle part 4 close to the rear end head 2 continuously cuts the remaining part of thrombus on the basis of the cut thrombus, namely, the vertex angle parts 4 arranged at different positions can not cut too large thrombus at a time, and the thrombus cutting effect by layering or front.

According to the technical scheme, on the basis of the flexible metal cutting wire, the cutting wire has better capability of supporting the shape of the cutting wire and improved rigidity through structural design, so that the cutting effect of the thrombus cutter on thrombus is improved, and the cutting wire is prevented from possibly damaging the wall surface of a blood vessel.

Claims

1. A thrombus cutter is characterized in that a cutting part consisting of a plurality of elastic cutting wires (3) is fixedly connected between a front end head (1) and a rear end head (2) of the thrombus cutter, wherein the front end head and the rear end head are provided with through holes, and each cutting wire (3) is provided with a vertex angle part (4) which plays a role in cutting thrombus.

2. The thrombectomy cutter according to claim 1, wherein adjacent cutting wires (3) are arranged equidistantly, and apex (4) of each cutting wire (3) is arranged equidistantly from the front tip (1).

3. The thrombectomy cutter according to claim 1, wherein adjacent cutting wires (3) are disposed equidistantly, and the apex (4) of two adjacent cutting wires (3) is located close to the front tip (1) and close to the rear tip (2).

4. A thrombectomy cutter according to claim 1, 2 or 3, wherein two adjacent cutting wires (3) are crossed, the apex (4) of one cutting wire (3) is close to the front tip (1) and the apex (4) of the other cutting wire (3) is close to the rear tip (2).

5. The thrombectomy cutter according to claim 4, wherein the two cutting wires (3) are twisted around each other at the crossing position (5) for at least one turn.

6. A thrombectomy cutter according to claim 5, wherein the distance from the apex of the apex (4) near the front tip (1) to the line connecting the front and rear tips (1, 2) is smaller than the distance from the apex of the apex (4) near the rear tip (2) to the line connecting the front and rear tips (1, 2).