CN117244158B

CN117244158B - Mechanical thrombus taking catheter and thrombus taking device

Info

Publication number: CN117244158B
Application number: CN202311474749.5A
Authority: CN
Inventors: 赵洁洁; 赵旭升; 马腾飞
Original assignee: Hengyi Beijing Medical Technology Co ltd
Current assignee: Hengyi Beijing Medical Technology Co ltd
Priority date: 2023-11-07
Filing date: 2023-11-07
Publication date: 2024-05-28
Anticipated expiration: 2043-11-07
Also published as: CN117244158A

Abstract

The application relates to a mechanical thrombus taking catheter and a thrombus taking device, wherein the mechanical thrombus taking catheter comprises a thrombus taking cavity and a thrombus taking opening which enables the thrombus taking cavity to be communicated with a blood vessel cavity, a plugging plate is arranged in the thrombus taking cavity, a movable piston is arranged between the plugging plate and the thrombus taking opening, the movable piston comprises an inward turning plate which is movably turned towards the proximal end, and the inward turning plate is opened and closed in a matched manner with an opening which is penetrated through the movable piston; the inner turning plate naturally jacks up under the pressure of the blood vessel cavity, and can rotate to cover the opening along with the retraction of the movable piston; the piston rod is characterized by further comprising a bolt discharging cavity, a one-way diaphragm is arranged between the bolt taking cavity and the bolt discharging cavity, and when the movable piston is pulled, the one-way diaphragm can be turned outwards to the bolt discharging cavity, so that the bolt taking cavity is communicated with the bolt discharging cavity. The application can perform thrombus extraction at multiple frequencies, has small influence on blood vessels and low operation precision requirement, can cause a closed environment, can be repeatedly expanded, and is convenient for extracting thrombus types which are not completely blocked.

Description

Mechanical thrombus taking catheter and thrombus taking device

Technical Field

The application relates to the technical field of medical instruments, in particular to a mechanical thrombus removing catheter and a thrombus removing device.

Background

Most of thrombus is not obvious before complete blockage, once complete blockage occurs, the death disability rate is extremely high, interventional therapy is mostly adopted in current treatment of thrombus, thrombus is taken through the thrombus taking catheter entering a lesion position, and the blocked blood vessel is opened to treat diseases.

The existing thrombus taking catheter is mainly used for manually and mechanically taking thrombus, so that the injury to blood vessels is large, and the other type of thrombus taking catheter is used for negative pressure thrombus taking, the accurate control of the extraction pressure is needed, the thrombus taking effect is poor due to the fact that the extraction pressure is too small, and the injury to the blood vessels can be caused due to the fact that the extraction pressure is too large.

Disclosure of Invention

The application aims to provide a mechanical thrombus taking catheter and a thrombus taking device, which can take thrombus at multiple times, have small influence on blood vessels, have low operation precision requirements, can cause a closed environment, can be repeatedly expanded, and are convenient for extracting thrombus types which are not completely blocked.

In order to achieve the above object, in a first aspect, the present invention provides a mechanical thrombus removing catheter, including a thrombus removing cavity and a thrombus removing port for communicating the thrombus removing cavity with a blood vessel cavity, wherein a plugging plate is installed in the thrombus removing cavity, a movable piston is arranged between the plugging plate and the thrombus removing port, the movable piston includes an inversion plate which is turned over and folded towards a proximal end, and the inversion plate is opened and closed in cooperation with an opening penetrating through the movable piston;

The inversion plate naturally jacks up under the pressure of the blood vessel cavity, and can rotate to cover the opening along with the retraction of the movable piston;

The plug removing device is characterized by further comprising a plug removing cavity, wherein a one-way diaphragm is arranged between the plug removing cavity and the plug removing cavity, and when the movable piston is pulled, the one-way diaphragm can be turned outwards to the plug removing cavity so that the plug removing cavity is communicated with the plug removing cavity.

In an alternative embodiment, the thrombus removing port comprises an open pipe orifice positioned at the distal end of the catheter, the plugging plate comprises a fixed plugging plate connected inside the thrombus removing cavity, the movable piston is accommodated in the pipe cavity of the fixed plugging plate and the open pipe orifice in a limiting mode, a space between the fixed plugging plate and the movable piston forms a thrombus introducing cavity, and blood with thrombus can enter the introducing cavity from the opening and enter the thrombus discharging cavity from the introducing cavity through the unidirectional membrane.

In an alternative embodiment, the fixed plugging plate is connected with a telescopic rod capable of moving back and forth in a penetrating way, the telescopic rod is connected with the movable piston through a switching wire, a penetrating hole for the telescopic rod to penetrate is formed in the fixed plugging plate, and a sealing ring is fixedly arranged on the penetrating hole.

In an alternative embodiment, the varus plate is arranged at the center of the movable piston, the movable piston comprises a movable expansion plate, a sealing sleeve is arranged between the expansion plate and the cavity wall of the thrombus taking cavity, the varus plate is a part of the expansion plate, the root of the varus plate is connected to the opening, and a clamping step matched with each other is arranged between the edge of the varus plate and the expansion plate.

In an alternative embodiment, at least one length is arranged between the movable piston and the fixed plugging plate, and a pressure spring is connected between the movable piston and the fixed plugging plate;

one end of the pressure spring is connected with the fixed plugging plate, and the other end of the pressure spring is connected with a part between the opening and the edge of the expansion plate.

In an alternative embodiment, the adapting wire comprises a plurality of flexible wires, one end of each flexible wire is connected with the far end of the telescopic rod in a crossing way, the other end of each flexible wire is connected to the plate surface of the telescopic plate, and the flexible wires are uniformly distributed between the telescopic rod and the telescopic plate at intervals.

In an alternative embodiment, a blocking ring for preventing the moving piston from being separated from the thrombus taking cavity is fixedly arranged in the thrombus taking cavity, and the blocking ring is arranged on the proximal end side of the open pipe orifice and comprises an annular plane which can be used for the moving piston to be attached.

In an alternative embodiment, the proximal end of the telescoping rod extends from the proximal end of the thrombus removal lumen, and graduations are provided on the sidewall of the telescoping rod proximal end.

In an optional embodiment, a bolt discharging port is arranged between the bolt taking cavity and the bolt discharging cavity, the bolt discharging port comprises a plurality of bolt discharging ports, the bolt taking cavity is arranged on the cavity wall of the bolt taking cavity in a penetrating mode, the one-way membrane is connected to the side of the bolt discharging cavity, and the bolt discharging port can be turned outwards to the bolt discharging cavity to be opened, or the bolt discharging port is closed by a buckle cover;

the contour shape of the unidirectional diaphragm follows the contour shape of the bolt discharging opening, and the size of the unidirectional diaphragm is larger than the size of the bolt discharging opening.

In a second aspect, the present invention provides a thrombolytic device comprising a balloon and a mechanical thrombolysis catheter according to any of the preceding embodiments, the balloon being attached to the outer side wall of the catheter distal end and the distal end of the balloon being attached to the distal end of the catheter;

The catheter comprises a pressurizing cavity, wherein the pressurizing cavity, the thrombus taking cavity and the thrombus discharging cavity are independently arranged, and the pressurizing cavity is communicated with the inner cavity of the saccule;

the proximal end of the catheter comprises a bifurcation connector, the bifurcation connector comprises an operation interface, a bolt discharging interface and a pressurizing interface, and the operation interface, the bolt discharging interface and the pressurizing interface are respectively communicated with the bolt taking cavity, the bolt discharging cavity and the pressurizing cavity.

The mechanical thrombus taking catheter fully utilizes the characteristic that after the catheter stretches into a blood vessel, the pressure in the blood vessel cavity can reversely push up the inner turning plate in a natural state and in the process of pushing the movable piston forward, so that the blood with thrombus enters the thrombus taking cavity of the catheter, and the movable piston and the plugging plate are arranged, so that the thrombus blood is led out during retraction and pulling.

By arranging the thrombus taking cavity and the thrombus taking opening communicated with the blood vessel cavity on the catheter, the blood with thrombus can enter the thrombus taking cavity, and the movable piston does not act, or when the movable piston advances forwards, the pressure in the blood vessel cavity can reversely push up the varus plate positioned at the proximal end side of the movable piston, so that the varus plate is separated from the buckle cover of the opening penetrating the movable piston in the thickness direction, and the thrombus blood enters the cavity between the plugging plate and the movable piston through the opening of the movable piston.

When the movable piston is pulled and retracted, the position of the blocking plate is unchanged, and the cavity space between the blocking plate and the movable piston is gradually reduced, so that the inside is pressurized, the varus plate is turned outwards towards the far end side, an opening on the movable piston is closed, and a closed cavity between the movable piston and the blocking plate can be formed.

Along with further retraction of the movable piston, the pressure in the closed cavity can overcome the buckling cover pressure of the unidirectional diaphragm between the thrombus taking cavity and the thrombus discharging cavity, and the unidirectional diaphragm is turned outwards towards the thrombus discharging cavity, so that the thrombus taking cavity is communicated with the thrombus discharging cavity, and further thrombus blood can be discharged into the thrombus discharging cavity in the closed cavity of the thrombus taking cavity.

Through the setting of moving piston and shutoff board to combine the interior board of turning over on moving piston and get the one-way diaphragm between bolt chamber and the row's of bolt chamber, can make the thrombus blood enter into and get the bolt chamber and discharge through row's bolt chamber at the flexible in-process of moving piston.

The telescopic process of the movable piston can form an intravascular thrombus extraction process, multiple-frequency extraction can be performed, the movable piston only stretches in the thrombus extraction cavity in the catheter, no damage is caused to the blood vessel, the pressure influence on the blood vessel cavity is limited, thrombus which is not blocked by the blood vessel can be extracted in a form of a structural closed cavity, the operation is simple, the use is convenient, and the thrombus extraction efficiency is improved.

Additional features and advantages of the application will be set forth in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a mechanical thrombolysis catheter according to the present application;

FIG. 2 is a schematic diagram of a moving piston;

FIG. 3 is a schematic side view of the structure of FIG. 2;

fig. 4 is a schematic structural view of a telescopic rod, a compression spring, a movable piston and an adapter wire;

FIG. 5 is a schematic view showing a state structure of a movable piston of the telescopic rod when the telescopic rod is pushed forward;

FIG. 6 is a schematic view of the structure of the telescopic rod moving the piston during pulling;

FIG. 7 is a schematic diagram of the distribution of different chambers on a catheter;

Fig. 8 is a schematic view of the overall structure of the thrombus removing device.

Icon:

1-a catheter body; 1 a-a thrombus taking cavity; 1 b-a pin removal cavity; 1 c-a pressurizing cavity; 1 d-guidewire lumen;

11-a thrombus taking port; 12-a unidirectional membrane; 13-arranging a bolt hole; 14-bifurcation linker; 14 a-an operation interface; 14 b-pin removal interface; 14 c-a pressurizing interface;

2-fixing a plugging plate;

3-moving the piston; 31-an inner turning plate; 32-opening; 33-sealing sleeve; 34-snap-fit steps;

4-a telescopic rod;

5-transferring the wire;

6-a compression spring;

7-a blocking ring;

8-saccule.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put in use of the product of this application, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, the mechanical thrombus removing catheter is mainly used for mechanically extracting thrombus which is small in size and not completely blocked in blood vessels. By constructing a sealed chamber capable of being closed or released in the thrombus taking cavity 1a and constructing a thrombus discharging channel between the thrombus taking cavity 1a and the thrombus discharging cavity 1b, the introduction of thrombus blood into the thrombus taking cavity 1a and the discharge of the introduced thrombus blood into the thrombus discharging cavity 1b are facilitated.

The invention relates to a mechanical thrombus taking catheter, which comprises a catheter body 1, wherein the catheter body 1 comprises a thrombus taking cavity 1a with the largest space and a thrombus taking port 11 which enables the thrombus taking cavity 1a to be communicated with a blood vessel cavity, the thrombus taking port 11 comprises an open pipe orifice positioned at the far end of the catheter body 1, a plugging plate is arranged in the thrombus taking cavity 1a, the plugging plate specifically comprises a fixed plugging plate 2 fixedly connected inside the thrombus taking cavity 1a, a movable piston 3 is arranged between the fixed plugging plate 2 and the open pipe orifice at the far end of the catheter body 1, and the movable piston 3 is limited and accommodated in the thrombus taking cavity 1a of the fixed plugging plate 2 and the open pipe orifice.

Referring to fig. 2-3, the fixed plugging plate 2 and the movable piston 3 can cooperate to form a closed chamber in the thrombus taking cavity 1a, the movable piston 3 comprises an varus plate 31 which is movably folded towards the proximal end side, the varus plate 31 is opened and closed in cooperation with an opening 32 which is formed in the movable piston 3 in a penetrating manner, the varus plate 31 and the opening 32 on the movable piston 3 can be fixed on the proximal end side of the movable piston 3 based on the fixed plugging plate 2 and a certain pressure in the vascular cavity, the application condition of the varus plate 31 can be naturally reversely pushed, when the movable piston 3 is pushed forward and displaced, the internal plugging plate 31 is further folded towards the proximal end side, the opening 32 on the movable piston 3 is opened, a channel on the movable piston 3 is opened, and thrombus blood is flushed into the cavity between the fixed plugging plate 2 and the movable piston 3 from the vascular cavity.

Meanwhile, when the movable piston 3 is retracted and pulled, as the cavity space between the fixed plugging plate 2 and the movable piston 3 is gradually reduced and the pressure is increased, the varus plate 31 can rotate towards the distal end at the proximal side of the movable piston 3 and is covered on the opening 32, so that the channel on the movable piston 3 is closed, and a closed cavity between the fixed plugging plate 2 and the movable piston 3 is formed.

The catheter body 1 further comprises a thrombus discharging cavity 1b, a one-way diaphragm 12 is arranged between the thrombus taking cavity 1a and the thrombus discharging cavity 1b, along with further pulling and collecting of the movable piston 3, the pressure of the formed closed cavity is further increased, the self elastic force of the one-way diaphragm 12 can be overcome, the one-way diaphragm 12 can be turned outwards towards the thrombus discharging cavity 1b, the thrombus taking cavity 1a is further communicated with the thrombus discharging cavity 1b, a thrombus discharging channel of thrombus blood is formed, and the thrombus blood is discharged from the closed cavity to the thrombus discharging cavity 1b under the action of the further increased internal pressure of the closed cavity.

In the mechanical thrombus removing catheter of the invention, the space between the fixed plugging plate 2 and the movable piston 3 can form a thrombus introducing cavity, and the blood with the thrombus can enter the introducing cavity from the opening 32 and enter the thrombus discharging cavity 1b from the introducing cavity through the unidirectional diaphragm 12.

By the arrangement, the introducing cavity can be switched between the sealing cavity and the state communicated with the blood vessel cavity under different displacement states of the movable piston 3, so that the introduction and the discharge of thrombus blood are facilitated.

Referring to fig. 3-6, the forward and retraction displacement of the moving piston 3 is controlled and adjusted, in particular by a telescopic rod 4. In one specific embodiment, the fixed plugging plate 2 is connected with a telescopic rod 4 capable of moving back and forth in a penetrating manner, and because the movable piston 3 is provided with an opening, in order to reduce the interference of the opening on the connection of the telescopic rod 4 and the movable piston 3, the telescopic rod 4 is connected with the movable piston 3 through a switching wire 5, and when the displacement of the movable piston 3 is controlled, the telescopic rod 4 can be pushed forward or pulled back.

The fixed plugging plate 2 is provided with a through hole for the telescopic rod 4 to pass through, in order to avoid the influence of the through hole on the construction of the closed cavity, the through hole is fixedly provided with a sealing ring, the sealing ring is sleeved on the outer side of the telescopic rod 4, and the telescopic rod 4 can be ensured to stretch out and draw back in the activity of the fixed plugging plate 2 on the premise of ensuring no leakage.

In this embodiment, the inner flap 31 is arranged in the center of the mobile piston 3, the mobile piston 3 comprises a movable expansion plate, the inner flap 31 is in particular a part cut on the expansion plate, after cutting is bent towards the proximal side of the expansion plate and constitutes a half-open opening 32 on the mobile piston 3.

In order to enable the inversion plate 31 to be reliably turned over the expansion plate, the root of the inversion plate 31 is connected to the rim of the opening 32. Further, the sealing sleeve 33 is arranged between the edge of the expansion plate and the cavity wall of the thrombus taking cavity 1a, so that the effective formation of a sealing cavity can be ensured, and the situation that the sealing cavity cannot be constructed in the state of internally overturning the closed opening 32 due to leakage is avoided.

Based on the above-described cutting process, the varus plate 31 is actually a part of the expansion plate, the root of the varus plate 31 is connected to the edge of the opening 32, and at the same time, according to the above-described movement turning manner of the varus plate 31, it can be seen that the varus plate 31 can only be turned towards the moving piston 3, i.e. the proximal side of the expansion plate, but cannot go beyond the expansion plate, at most keeping the varus plate 31 flush with the distal side wall surface of the expansion plate, preventing the occurrence of gaps.

Therefore, it is necessary to consider to provide a necessary limit turning structure to block excessive turning of the inner turning plate 31, and a snap step 34 is provided between the edge of the inner turning plate 31 and the expansion plate. Specifically, the expansion plate is converted into a ring-shaped structure after being cut except for the root of the inner flap 31, so that the inner side of the ring-shaped structure constitutes the opening 32.

Meanwhile, the buckling step 34 is processed in the cutting process, and the edge of the inner turning plate 31 and the edge of the opening 32 can be respectively cut and processed to form the mutually matched buckling block and the buckling groove with slope structures, so that the edges of the inner turning plate 31 and the opening 32 respectively form the buckling step 34, when the inner turning plate 31 turns towards the far end side and is attached to the telescopic plate, the buckling block and the buckling groove can enable the inner turning plate 31 and the opening 32 to be overlapped and combined into the integral telescopic plate, tightness can be ensured through mutual buckling, and good limiting and sealing effects are achieved.

In order to form the leading-in cavity between fixed shutoff board 2 and the movable piston 3, and can do benefit to the space adjustment pressure of changing airtight cavity, set up one section length at least between movable piston 3 and the fixed shutoff board 2, and be connected with pressure spring 6 between the two, can make movable piston 3 flexible repeatedly under pressure spring 6 and telescopic link 4's effect, the multifrequency is extracted to do benefit to through pressure spring 6 and telescopic link 4's cooperation, with the operation of the form adjustment row bolt of change leading-in cavity space and bolt taking.

One end of the pressure spring 6 is connected with the fixed plugging plate 2, and the other end is connected with a part between the opening 32 and the edge of the expansion plate. Specifically, the proximal end of the pressure spring 6 is connected to the fixed plugging plate 2, and the distal end of the pressure spring 6 is connected to a portion between the opening 32 and the edge of the expansion plate, so that interference between the distal end of the pressure spring 6 and the sealing sleeve 33 is avoided, and the formation of the closed cavity is further affected.

Due to the arrangement of the pressure spring 6, the movable piston 3 does not need to be pushed forward purposely, and in a natural state, the self elastic force of the pressure spring 6 gives the movable piston 3, namely the expansion plate, a forward pushing trend, and more pulling and retracting operations are performed in the process of removing the thrombus. The telescopic rod 4 does not extend to the part of the telescopic plate, and the telescopic rod 4 is connected with the telescopic plate through the switching wire 5.

The switching silk 5 includes many flexible silk, and the one end of every flexible silk meets and connects the distal end at telescopic link 4, and the other end is connected on the face of expansion plate, and many flexible silk interval equipartitions are between telescopic link 4 and expansion plate. Based on the setting of pressure spring 6 to and the push-forward trend of expansion plate is driven to pressure spring 6 elasticity, many flexible silk distributes between expansion rod 4 distal end and expansion plate with the rib form, and this kind of setting mode has had the control of expansion rod 4 to the expansion plate concurrently, and dodges thrombus blood. The thrombotic blood can pass through the gaps between the flexible wires and is guided into the thrombus removal lumen 1b.

Based on the arrangement of the pressure spring 6, from the angle of preventing the moving piston 3 from being separated from the catheter, a blocking ring 7 is fixedly arranged in the thrombus taking cavity 1a and used for preventing the moving piston 3 from being separated from the thrombus taking cavity 1a.

The blocking ring 7 is arranged on the proximal side of the open orifice, i.e. inside the embolectomy 1a, and comprises an annular plane on which the mobile piston 3 can come into abutment. The distal end side face of the expansion plate included in the movable piston 3 can be blocked, limited and attached to the annular plane, so that the blocking ring 7 can exert a reliable blocking effect, and the use safety is enhanced.

The proximal end of the telescopic rod 4 extends out from the proximal end opening of the thrombus taking cavity 1a, the movable piston 3 can move in a telescopic manner between the fixed plugging plate 2 and the blocking ring 7, and in order to judge that the pulling and retracting stroke of the movable piston 3 does not cross the proximal end side of the unidirectional diaphragm 12, scales are arranged on the side wall of the proximal end of the telescopic rod 4, and can be obtained through the cooperation of the pressure spring 6 before assembly, so that the control of the pulling degree of the telescopic rod 4 is facilitated.

A bolt discharging opening 13 is arranged between the bolt taking cavity 1a and the bolt discharging cavity 1b, the bolt discharging opening 13 is specifically formed in the side wall of the bolt taking cavity 1a, the bolt discharging opening 13 comprises a plurality of bolt discharging openings, the bolt discharging openings penetrate through the cavity wall of the bolt taking cavity 1a, the unidirectional membrane 12 is connected to the side of the bolt discharging cavity 1b and can only be turned outwards towards the bolt discharging cavity 1b to form a unidirectional opening and closing structure, and the unidirectional membrane 12 can be turned outwards towards the bolt discharging cavity 1b to open the bolt discharging opening 13, or a buckle cover is attached to the outer cavity wall of the bolt taking cavity 1a to close the bolt discharging opening 13.

By providing the thrombus removal port 13 and the one-way membrane 12, reliable removal of thrombus blood from the thrombus removal chamber 1a into the thrombus removal chamber 1b can be ensured.

The contour shape of the unidirectional membrane 12 follows the contour shape of the bolt discharging opening 13, and the size of the unidirectional membrane 12 is larger than that of the bolt discharging opening 13, so that the reliability of closing the bolt discharging opening 13 by the buckle cover can be ensured.

Through the mechanical thrombus removing catheter, thrombus in a blood vessel can be finally guided into the thrombus removing cavity 1b in the process of pulling the telescopic rod 4, thrombus blood gathered in the thrombus removing cavity 1b can be withdrawn along with the catheter after the thrombus is removed, the operation is simple and controllable, and the safety and reliability of thrombus removing operation are ensured on the premise of reducing the influence on the blood vessel to the greatest extent.

The invention also provides a thrombus taking device which comprises a balloon 8 and the mechanical thrombus taking catheter, wherein the balloon 8 is connected to the outer side wall of the distal end of the catheter, the distal end of the balloon 8 is connected with the distal end of the catheter, the open orifice of the distal end of the catheter is effectively avoided, in the operation process, the balloon 8 can be pressurized and expanded at the proximal end side of a thrombus taking vessel section to form a blockage of a thrombus escape channel, so that thrombus can only enter the thrombus taking cavity 1a of the catheter through the open orifice of the distal end of the catheter, and the thoroughness of thrombus removal is enhanced.

The catheter body 1 is composed of a plurality of chambers, and comprises a pressurizing cavity 1c, a thrombus taking cavity 1a and a thrombus discharging cavity 1b, wherein the pressurizing cavity 1c, the thrombus taking cavity 1a and the thrombus discharging cavity 1b are independently arranged and respectively play the application function, and the pressurizing cavity 1c is communicated with the inner cavity of the balloon 8 so as to facilitate the pressurizing and depressurizing operation of the balloon 8.

The proximal end of the catheter body 1 comprises a bifurcation joint 14, the bifurcation joint 14 comprises an operation interface 14a, a bolt discharging interface 14b and a pressurizing interface 14c, and the operation interface 14a, the bolt discharging interface 14b and the pressurizing interface 14c are respectively communicated with the bolt taking cavity 1a, the bolt discharging cavity 1b and the pressurizing cavity 1c. The proximal end of the telescopic rod 4 is extended from the operation interface 14a, and the retraction of the telescopic rod 4 is operated by the scale. The bolt discharging port 14b can be directly communicated with the outside, so that stable air pressure balance is provided for the introduction of thrombus blood in the bolt discharging cavity 1b, and the air passage blockage in the cavity is avoided. The pressurizing port 14c can be externally connected with pressurizing equipment, so that the pressurizing and depressurizing operation on the balloon 8 is facilitated.

The catheter body 1 is also provided with a guide wire cavity 1d, the proximal end side of the guide wire cavity 1d is an RX port on the catheter body 1, and the distal end side directly extends to the end face of the distal end of the catheter body 1, so that the distal end of the catheter body 1 can be conveniently conveyed to the proximal end part of a blood vessel containing thrombus under the guidance of a guide wire.

It is important to point out that the mechanical thrombus taking catheter and the thrombus taking device in the invention facilitate the collection of thrombus blood by the open pipe orifice at the distal end of the catheter after the balloon 8 is inflated to block the escape channel of thrombus, and the operation of extracting the thrombus blood is carried out in the catheter without any damage to the blood vessel. The balloon 8 can be pressurized and decompressed for multiple times, and the thrombus of different tube sections can be removed by combining the movement of the catheter, and meanwhile, the cutting structure can be arranged on the balloon 8 in a matching manner, so that thrombus blocking the blood vessel can be removed after being cut. The movable piston 3 in the thrombus taking cavity 1a can be repeatedly telescopic and operated for multiple times, the operation frequency of each time is small, the operation is light, and the thrombus taking operation task can be accurately completed. The telescopic rod 4 can be manually operated, can also be connected with an external electric motor to operate, and expands the use scene.

It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The mechanical thrombus taking catheter is characterized by comprising a thrombus taking cavity and a thrombus taking opening which enables the thrombus taking cavity to be communicated with a blood vessel cavity, wherein a plugging plate is arranged in the thrombus taking cavity, a movable piston is arranged between the plugging plate and the thrombus taking opening, and a thrombus introducing cavity is formed between the plugging plate and the movable piston;

The movable piston comprises an inward turning plate which is movably turned towards the proximal end, the inward turning plate is matched with an opening which is penetrated on the movable piston to open and close, and the movable piston also comprises a clamping step which is matched with the inward turning plate;

The movable piston is pulled, and the one-way diaphragm can be turned outwards to the bolt-discharging cavity so that the bolt-taking cavity is communicated with the bolt-discharging cavity;

The plugging plate is connected with a telescopic rod capable of moving forwards and backwards in a penetrating mode, and the telescopic rod is connected with the movable piston.

2. The mechanical embolectomy catheter of claim 1 wherein said embolectomy comprises an open nozzle at a distal end of the catheter, said stopper plate comprises a fixed stopper plate attached to an interior of said embolectomy lumen, said movable piston is received in a lumen of said fixed stopper plate and said open nozzle, a space between said fixed stopper plate and said movable piston defines an infusion lumen of thrombus, blood entrained with thrombus is capable of entering said infusion lumen through said opening and from said infusion lumen through said unidirectional diaphragm into said embolectomy lumen.

3. The mechanical thrombus removal catheter according to claim 2, wherein a telescopic rod capable of moving back and forth is connected to the fixed plugging plate in a penetrating manner, the telescopic rod is connected with the movable piston through a switching wire, a penetrating hole for the telescopic rod to penetrate is formed in the fixed plugging plate, and a sealing ring is fixedly arranged on the penetrating hole.

4. A mechanical embolectomy catheter according to claim 3 wherein the inversion plate is centrally disposed in the movable piston, the movable piston comprises a movable expansion plate, a sealing sleeve is disposed between the expansion plate and the wall of the embolectomy cavity, the inversion plate is part of the expansion plate, the root of the inversion plate is connected to the opening, and a snap-fit step is disposed between the edge of the inversion plate and the expansion plate.

5. The mechanical embolectomy catheter of claim 4 wherein said movable piston is at least one length disposed between said fixed plug and said compression spring coupled therebetween;

6. The mechanical embolectomy catheter of claim 4 wherein the transition wire comprises a plurality of flexible wires, one end of each flexible wire is connected to the distal end of the telescoping rod in a converging manner, the other end of each flexible wire is connected to the plate surface of the telescoping plate, and the plurality of flexible wires are evenly distributed between the telescoping rod and the telescoping plate at intervals.

7. The mechanical embolectomy catheter of claim 4 wherein said embolectomy lumen has fixedly disposed therein a blocking ring for preventing said moving piston from exiting said embolectomy lumen, said blocking ring disposed on a proximal side of said open nozzle and comprising an annular planar surface against which said moving piston can engage.

8. The mechanical embolectomy catheter of claim 4 wherein the proximal end of the telescoping rod extends from the proximal end of the embolectomy lumen and graduations are provided on a sidewall of the telescoping rod proximal end.

9. The mechanical embolectomy catheter of any of claims 1-8, wherein a embolectomy port is provided between the embolectomy lumen and the embolectomy lumen, the embolectomy port comprises a plurality of embolectomy ports, the two embolectomy ports are formed through the wall of the embolectomy lumen, the one-way membrane is connected to the side of the embolectomy lumen, and the embolectomy port can be opened by everting the embolectomy lumen or closed by a buckle cover;

10. A thrombolysis device comprising a balloon and the mechanical thrombolysis catheter of any one of claims 1-9, wherein the balloon is attached to an outer sidewall of a distal end of the catheter and the distal end of the balloon is attached to the distal end of the catheter;