CN116269638A

CN116269638A - Double-channel type thrombus catheter

Info

Publication number: CN116269638A
Application number: CN202310206498.6A
Authority: CN
Inventors: 李畅; 李传明; 熊坤林; 杜春奇; 赵宇; 刘军; 冯俊榜; 赖雨琪
Original assignee: Chongqing Emergency Medical Center Chongqing Fourth People's Hospital And Chongqing Institute Of Emergency Medicine
Current assignee: Chongqing Emergency Medical Center Chongqing Fourth People's Hospital And Chongqing Institute Of Emergency Medicine
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-06-23

Abstract

The invention discloses a double-channel type thrombus catheter, which comprises a catheter body, and is characterized in that: the catheter body is provided with a branch pipe, a partition extending along the length direction of the catheter body is arranged in the catheter body, the interior of the catheter body is partitioned into a thrombus channel and a drug channel by the partition, the thrombus channel penetrates through the catheter body along the length direction of the catheter body, one end of the drug channel is positioned in the catheter body, and the other end of the drug channel is communicated with the branch pipe; the partition is made of elastic materials, and when blood flows through the thrombus channel, the partition can be deformed under pressure and is attached to the pipe wall of the catheter body. The beneficial effects of the invention are as follows: can make the thrombus duct have thrombus channel and medicine channel at the same time with smaller total pipe diameter.

Description

Double-channel type thrombus catheter

Technical Field

The invention relates to a vascular catheter, in particular to a double-channel type thrombus catheter.

Background

With the development of imaging medical technology, endovascular intervention has become a common procedure for treating thrombotic diseases. Endovascular interventions are the insertion of a thrombotic catheter into a patient's blood vessel, after which the thrombus is aspirated from the catheter by means of imaging techniques.

In early clinical surgical treatment, catheter blockage occurred when relatively large-sized thrombi were faced. At this time, it is necessary to pull the catheter out of the patient, push out the thrombus in the catheter in the opposite direction, then implant the catheter into the patient, and continue aspiration of the thrombus. Because the metal guide wire is firstly implanted in the thrombus catheter, repeated insertion of the guide wire and the vascular catheter can increase pain of a patient, even cause vasoconstriction, and the condition that the catheter cannot be inserted exists.

In order to avoid the problem that large-particle thrombus is easy to cause catheter blockage, a plurality of thrombus catheters with thrombolytic agent channels are also on the market at present, wherein the catheters comprise thrombus channels and drug channels, thrombolytic agents are firstly injected into blood vessels of patients from the drug channels during interventional operation treatment, and thrombus is sucked from the thrombus channels after the size of the large-particle thrombus is reduced.

The thrombolytic agent channel is additionally arranged on the thrombus catheter body, if the original thrombus channel size is ensured to be unchanged, the total size of the catheter body is inevitably thickened, so that the intubation difficulty is increased. Such as: the invention patent publication No. CN115444509A discloses a thrombus aspiration thrombolysis protection device, in which an embodiment of the device is described as a tube body for aspiration of thrombus, the tube body has an aspiration channel and a thrombolysis channel inside, and the thrombolysis channel is arranged in the circumferential direction of the aspiration channel in a concentric circle manner. And, for example: the invention patent publication No. CN209172418U discloses a thrombolytic aspiration catheter assembly, which comprises an aspiration interventional tube and a thrombolytic infusion tube, wherein the aspiration interventional tube and the thrombolytic infusion tube are arranged side by side along the radial direction. It is needless to say that both of the thrombotic catheters described in these patent documents with the thrombolytic agent passage attached thereto cause an increase in the overall diameter of the catheter body.

Disclosure of Invention

In view of this, the present invention provides a two-channel thrombotic catheter, which aims to provide a thrombotic catheter with both a thrombotic channel and a drug channel with a smaller total tube diameter.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

a double-channel thrombus catheter comprises a catheter body, and is characterized in that: the catheter body is provided with a branch pipe, a partition extending along the length direction of the catheter body is arranged in the catheter body, the interior of the catheter body is partitioned into a thrombus channel and a drug channel by the partition, the thrombus channel penetrates through the catheter body along the length direction of the catheter body, one end of the drug channel is positioned in the catheter body, and the other end of the drug channel is communicated with the branch pipe;

the partition is made of elastic materials, and when blood flows through the thrombus channel, the partition can be deformed under pressure and is attached to the pipe wall of the catheter body.

Preferably, a guide piece is arranged at the position of the catheter body close to the inner end of the partition, and the upper part of the guide piece is rotationally connected with the top of the catheter body;

when blood flows outwards from the inner end of the catheter body, the fluid can push the guide piece to rotate clockwise and force the guide piece to press the inner end of the partition against the top wall of the catheter body;

when the liquid medicine flows inward from the outer end of the medicine passage, the fluid can push the guide piece to rotate counterclockwise, so that the inner end of the medicine passage is opened.

Preferably, the top of the catheter body is provided with a miniature boss extending downwards, and the upper part of the guide piece is rotationally hung on the miniature boss.

Preferably, the miniature lug boss is provided with a limiting structure, and when the liquid medicine flows inwards from the medicine channel, the limiting structure can enable the guide piece to keep a rightward inclined posture.

Preferably, the inner end of the partition is provided with a deformation retaining section, the hardness of the deformation retaining section is between that of the partition and the catheter body, and the deformation retaining section can be switched between upward bending and downward bending.

Preferably, the partition is made of natural rubber, polyurethane, silica gel or latex.

Preferably, the cross-sectional ratio of the thrombus channel to the drug channel is greater than or equal to 3:1.

Preferably, the branch pipe is integrally formed with the catheter body.

Preferably, the branch pipe and the catheter body are constructed in a Y-shaped structure.

Preferably, the outer ends of the branch pipe and the catheter body are respectively provided with a medical standard threaded joint.

Compared with the prior art, the invention has the beneficial effects that:

by adopting the double-channel thrombus catheter provided by the invention, the thrombus channel and the medicine channel are formed by the partition, the partition can be flexibly expanded and deformed, and when thrombus is sucked, blood fluid can press the partition to deform upwards, and the thrombus channel is almost the total section of the whole catheter body. Obviously, the design not only ensures that the thrombus catheter has a thrombus channel and a medicine channel at the same time, but also does not additionally increase the total diameter of the catheter, and has the technical advantages of ingenious design conception, simple structure and high medical application value.

Drawings

FIG. 1 is a cross-sectional view of a two-channel thrombotic catheter (with guide blade 3 open);

FIG. 2 is a partial cross-sectional view of the inner end of the thrombotic catheter (with the guide blade 3 closed);

FIG. 3 is a schematic view (in perspective cross-section) of a portion of the inner end of a thrombotic catheter;

FIG. 4 is a schematic view of a partial structure of the inner end of the thrombus catheter (the guide sheet 3 is in an explosive separation state);

FIG. 5 is another embodiment of an internal partition 1a of the catheter body 1;

FIG. 6 is a cross-sectional view taken along the direction A-A in FIG. 5;

fig. 7 is a state diagram of the partition 1a in fig. 6 when it is opened.

Detailed Description

The invention is further described below with reference to examples and figures.

As shown in fig. 1, the double-channel thrombus catheter structurally comprises a catheter body 1, a branch pipe 2 is integrally formed at a position, close to the outer end of the catheter body 1, and the branch pipe 2 and the catheter body 1 are integrally in a Y-shaped pipeline structure. The catheter body 1 is internally provided with a partition 1a extending along the length direction of the catheter body, the partition 1a partitions the interior of the catheter body 1 into a thrombus channel a and a medicine channel b, one end of the partition 1a is positioned close to the inner end of the catheter body 1, and the other end of the partition 1a is positioned at the junction of the branch pipe 2 and the catheter body 1. The thrombus channel a penetrates along the length direction of the catheter body 1, one end of the medicine channel b is positioned at the inner end of the catheter body 1, and the other end of the medicine channel b is communicated with the branch pipe 2. The partition 1a is made of an elastic material.

Based on the above structural design, after the inner end of the thrombus catheter is inserted into the blood vessel of the patient, the medicine injector is connected to the end part of the branch pipe 2, so that the thrombolytic agent or other therapeutic medicine can be injected into the blood vessel of the patient through the medicine channel b. By attaching the thrombus-drawing device to the outer end of the catheter body 1, thrombus can be drawn out from the thrombus passageway a. Because the partition 1a is made of elastic membranous material, when thrombus is drawn, blood fluid can press the partition 1a to deform to be in a state of being attached to the top of the catheter body 1, and at the moment, the thrombus channel a is a channel corresponding to the whole catheter body 1. Therefore, the design ensures that the double-channel thrombus catheter has smaller total diameter, not only meets the requirement of drug injection, but also can ensure the feasibility of intubation.

Further, the material of the partition 1a may be natural rubber, polyurethane, silica gel or latex. In this embodiment, in order to sufficiently ensure the flow cross section of the thrombus passage a, the cross section ratio of the thrombus passage a to the drug passage b is 3:1 or more, that is, the ratio of the thrombus passage a to the total cross section of the catheter body 1 should be more than 75% in the natural state of the partition 1 a.

As shown in fig. 1, a guiding piece 3 is arranged at a position of the conduit body 1 near the inner end of the partition 1a, a miniature boss 1b extending downwards is arranged at the top of the conduit body 1, and the upper part of the guiding piece 3 is rotatably hung on the miniature boss 1 b. As can be seen from fig. 2, in the process of the blood drawing plug, blood flows outwards from the inner end of the catheter body 1, and fluid pushes the guide piece 3 to rotate clockwise until the guide piece 3 is attached to the top wall of the catheter body 1, the inner end of the partition 1a can be pressed on the top wall of the catheter body 1 in the process, so that the inner end of the medicine channel b is closed, and then the flexible partition 1a can be completely upwards spread by further blood flow, so that the partition 1a can be ensured to successfully deform in the direction of enlarging the thrombus channel a. In addition, the guide sheet 3 can prevent blood from flowing into the medicine passage b.

As shown in fig. 1 and 2, in the process of injecting thrombolytic agent or medicine, the medicine liquid flows inwards from the medicine channel b, and the fluid pushes the guiding piece 3 to rotate anticlockwise, so that the inner end of the medicine channel b is opened, thereby ensuring that the medicine liquid can be successfully delivered into the blood vessel of a patient. Further, as can be seen from fig. 3 and 4, the miniature boss 1b is provided with a limit structure 1c, and the limit structure 1c can keep the guide plate 3 at a proper inclination to the right during injection of thrombolytic agent or medicine, so that the design is helpful to ensure smooth closing of the guide plate 3 during thrombus extraction.

Further, the inner end of the partition 1a is provided with a deformation retaining section 1a1, the deformation retaining section 1a1 is also elastic with a proper amount, but the hardness of the deformation retaining section is between the partition 1a and the catheter body 1, so that the deformation retaining section 1a1 can be switched between upward bending and downward bending under the thrust action of the guide piece 3 and the liquid medicine fluid, and the inner end of the medicine channel b can be better closed and opened. In this embodiment, the guiding piece 3 has an arc structure, and the surface radian of the guiding piece is adapted to the inner wall of the catheter body 1.

In the above embodiment, the deformation retaining section 1a1 may be replaced by a simpler elastic rib, the elastic rib is integrally formed at the inner end of the partition 1a, and the inner end of the partition 1a can be automatically closed by the elastic rib when the injection of the chemical solution is stopped, so that the guide piece 3 can be omitted in the embodiment.

It is obvious that, when sucking thrombus, no matter the guide piece 3 is arranged at the inner end of the partition 1a or the elastic rib is arranged, the inner end of the partition 1a is pressed, so that the risk of downward deformation of the partition 1a is avoided, and the thrombus channel a is not smaller in the reverse direction when the elastic partition is used. In addition, the present embodiment provides a design to achieve this effect, specifically as follows:

referring to fig. 5 and 6, in the natural state of the thrombus catheter, the partition 1a is in a tensile stress state, the proportion of the drug channel b in the total section of the catheter body 1 is very small, and the partition 1a is almost in a bonding state with the top wall of the catheter body 1. This ensures that the thrombus passageway a has a sufficient flow cross section when aspirating a thrombus and that the partition 1a has a relatively low probability of expanding downwardly. Referring to fig. 7, when the liquid medicine is injected, the fluid pressure forces the partition 1a to expand downward, so that the circulation of the medicine passage b can be ensured. In this embodiment, the proportion of the drug channel b in the total cross section of the catheter body 1 is preferably controlled to within 5%, preferably 2%.

As shown in fig. 1, the outer ends of the branch pipe 2 and the catheter body 1 are respectively provided with a medical standard threaded joint for facilitating the connection of corresponding appliances.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A two-channel thrombotic catheter, comprising a catheter body (1), characterized in that: a branch pipe (2) is arranged on the catheter body (1), a partition (1 a) extending along the length direction of the catheter body (1) is arranged in the catheter body (1), the partition (1 a) divides the interior of the catheter body (1) into a thrombus channel (a) and a medicine channel (b), the thrombus channel (a) penetrates through the catheter body (1) along the length direction, one end of the medicine channel (b) is positioned in the catheter body (1), and the other end of the medicine channel (b) is communicated with the branch pipe (2);

the partition (1 a) is made of elastic materials, and when blood flows through the thrombus passage (a), the partition (1 a) can be pressed and deformed and is attached to the pipe wall of the catheter body (1).

2. The dual channel thrombotic catheter of claim 1, wherein: the guide piece (3) is arranged at the position of the guide pipe body (1) close to the inner end of the partition (1 a), and the upper part of the guide piece (3) is rotationally connected with the top of the guide pipe body (1);

when blood flows outwards from the inner end of the catheter body (1), the fluid can push the guide piece (3) to rotate clockwise and force the guide piece (3) to press the inner end of the partition (1 a) on the top wall of the catheter body (1);

when the liquid medicine flows inward from the outer end of the medicine passage (b), the fluid can push the guide piece (3) to rotate counterclockwise, so that the inner end of the medicine passage (b) is opened.

3. The dual channel thrombotic catheter of claim 2, wherein: the top of the catheter body (1) is provided with a miniature boss (1 b) extending downwards, and the upper part of the guide piece (3) is rotationally hung on the miniature boss (1 b).

4. A two-channel thrombotic catheter according to claim 3, wherein: the miniature lug boss (1 b) is provided with a limit structure (1 c), and when the liquid medicine flows inwards from the medicine channel (b), the limit structure (1 c) can enable the guide piece (3) to keep a rightward inclined posture.

5. The dual channel thrombotic catheter of claim 2, wherein: the inner end of the partition (1 a) is provided with a deformation retaining section (1 a 1), the hardness of the deformation retaining section (1 a 1) is between the partition (1 a) and the catheter body (1), and the deformation retaining section (1 a 1) can be switched between upward bending and downward bending.

6. The dual channel thrombotic catheter of claim 1, wherein: the partition (1 a) is made of natural rubber, polyurethane, silica gel or latex.

7. The dual channel thrombotic catheter of claim 1, wherein: the cross section ratio of the thrombus channel (a) to the drug channel (b) is more than or equal to 3:1.

8. The dual channel thrombotic catheter of claim 1, wherein: the branch pipe (2) and the catheter body (1) are integrally formed.

9. The dual channel thrombotic catheter of claim 1, wherein: the branch pipe (2) and the catheter body (1) are constructed in a Y-shaped structure.

10. The dual channel thrombotic catheter of claim 1, wherein: in a natural state, the partition (1 a) is in a stretching stress state, and the proportion of the medicine channel (b) to the total section of the catheter body (1) is not more than 5%.