CN212307963U

CN212307963U - Thrombus taking-out catheter

Info

Publication number: CN212307963U
Application number: CN202021014350.0U
Authority: CN
Inventors: 韩建超
Original assignee: Shanghai Rongmai Medical Technology Co ltd
Current assignee: Shanghai Rongmai Medical Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-01-08
Anticipated expiration: 2030-06-04

Abstract

The utility model discloses a thrombus takes out pipe belongs to thrombus and clears away technical field. The separator comprises a separator, an inner pipe, an outer pipe and a tail end connecting piece; the separator is of a spindle-shaped structure, is coaxially fixed at the near end of the inner tube, is internally provided with a wire guide hole communicated with the inner tube, and is provided with at least one groove on the surface at the far end; the far end of the outer pipe is connected with the near end of the tail end connecting piece in a sealing mode, a liquid pumping port connected with the outside is arranged on one side of the middle portion of the tail end connecting piece, and the inner pipe is arranged in the outer pipe. Set up the separator at the inner tube near-end, set up the recess through the separator distal end surface at fusiform, utilize the inner tube to come back to move the separator, the recess of separator can bring the thrombus near the outer tube near-end into the outer tube, improves the extraction efficiency of thrombus, under the suction effect of push-and-pull piece slip cylinder section and trailing end connection spare, the undulant suction power that the outer tube near-end produced also is favorable to thrombus to separate from the vascular wall.

Description

Thrombus taking-out catheter

Technical Field

The utility model relates to a thrombus takes out pipe belongs to thrombus and clears away technical field.

Background

Deep Venous Thrombosis (DVT) is a disease caused by abnormal clotting of blood within a deep vein. DVT causes increased venous pressure, impeded blood return, lower limb swelling, pain and dysfunction, and if not effectively treated in the acute phase, thrombosis, venous obstruction, loss of valve function, venous return and venous hypertension, post-thrombotic syndrome (PTS), endangers limb survival. Meanwhile, the thrombus is in the risk of falling off, the fallen thrombus reaches pulmonary artery along with blood flow impact to cause Pulmonary Thromboembolism (PTE), and the pulmonary embolism has high fatality rate and disability rate and threatens life safety. The PTE and DVT are collectively called Venous Thromboembolism (VTE), and both have the same predisposition factor and are two manifestations of VTE at different sites and different stages.

By oral administration or injection of aspirin, heparin or warfarin and the like, the medicine can enter a blood system, so that venous thrombosis is effectively dissolved, and the incidence of deep venous thrombosis and pulmonary embolism is greatly reduced. Meanwhile, the prevention and treatment of the medicine also has obvious limitations, and serious body bleeding can be caused by conditions such as easy hemorrhagic constitution, hemorrhagic diabetes, hemorrhagic stroke, nerve operation, serious trauma, pleural hemorrhage, pelvic bone and lower limb fracture caused by intracranial hemorrhage, anticoagulant disorder and the like, so that the life of a patient is endangered.

The catheter-directed thrombolysis (CDT) can directionally deliver thrombolytic drugs (such as urokinase and the like) to a thrombus part, effectively reduce thrombus load, recover forward blood flow in veins at early stage, relieve or relieve vein obstruction, protect vein valve morphology and function, block pathological process of PTS and reduce incidence rate of PTS. However, the CDT treatment of DVT has the problem of long thrombolysis time (the average thrombolysis time is 53.4 hours), which can cause long-time catheter retention, increase the discomfort of patients and prolong the hospitalization time; repeated blood draws, requires close monitoring and high-level care; in case of severe swelling and even endangering the survival of limbs, the blood flow is not opened as soon as possible; bleeding risk of thrombolytic drugs; CDT is not suitable for patients at high risk of bleeding (e.g. severe hypertension, etc.) and for patients with childbirth and pregnancy.

Traditional surgical embolectomy is suitable for patients with severe clinical symptoms of DVT who cannot use thrombolytic drugs. Its disadvantages are: the vein incision and thrombus removal is invasive operation and is not suitable for patients with poor general conditions; embolectomy can disrupt valve function; residual thrombus exists, and further thrombolysis and anticoagulation are easy to cause wound complications.

With the development of technology, in recent years, mechanical thrombus removal (PMT) devices have appeared, which are a group of instruments for removing acute and subacute thrombus formation in blood vessels, and remove thrombus in blood vessels by means of dissolution, pulverization and suction, and restore blood circulation and valve function. PMT is microtrauma intracavity thrombus clearing device, can clear away the thrombus fast, resumes blood flow, saves valve function, and clinical effect has obtained expert's recognition, becomes the focus of research in recent years.

At present, the clinically used PMT device has the defects of low thrombus taking efficiency, large thrombus blocking catheter and the like, aiming at the defects, the technology provides a thrombus taking catheter, the fluctuating suction force is favorable for peeling the thrombus, a separator is arranged at the near end, the thrombus can be guided into the catheter and simultaneously cracked, a side hole is arranged at the near end of the catheter, the thrombus can be further cracked in the thrombus transferring process, and the thrombus is discharged to the outside of the body under the action of negative pressure.

Disclosure of Invention

The utility model discloses the technical problem that will solve lies in: provides a thrombus taking-out catheter, which solves the problem that the existing mechanical thrombus removing device has a large thrombus blocking catheter.

The utility model discloses the technical problem that will solve takes following technical scheme to realize:

a thrombus extraction catheter comprises a separator, an inner tube, an outer tube and a tail end connecting piece;

the separator is of a spindle-shaped structure, is coaxially fixed at the near end of the inner tube, is internally provided with a wire guide hole communicated with the inner tube, and is provided with at least one groove on the surface at the far end;

the far end of the outer pipe is connected with the near end of the tail end connecting piece in a sealing mode, a liquid pumping port connected with the outside is arranged on one side of the middle portion of the tail end connecting piece, and the inner pipe is arranged in the outer pipe.

As a preferable example, the far end of the inner tube is fixed with a push-pull piece, the push-pull piece is provided with a sliding cylindrical section and a handheld section, and the sliding cylindrical section is hermetically arranged at the far end of the tail end connecting piece.

As a preferred example, the side surface of the proximal end of the outer tube is provided with at least one side hole.

As a preferred example, the distal surface of the separator is provided with a plurality of grooves, which are evenly distributed along the circumference.

As a preferable example, a sealing ring is tightly sleeved on the sliding cylindrical section, a locking cap for pressing the sealing ring is fixed at the far end of the tail end connecting piece, a hollow hole is formed in the middle of the locking cap, and the handheld section penetrates out of the hollow hole of the locking cap.

The utility model has the advantages that:

(1) the separator is arranged at the near end of the inner tube, the groove is formed in the surface of the far end of the fusiform separator, the separator is moved back and forth by the inner tube, thrombus near the near end of the outer tube can be brought into the outer tube by the groove of the separator, the thrombus extraction efficiency is improved, and when the flow of a liquid extraction port is fixed, the fluctuation suction force generated by the near end of the outer tube is favorable for separating the thrombus from the vascular wall under the suction action of the sliding cylindrical section of the push-pull piece and the tail end connecting piece;

(2) in addition, for larger thrombus, after the groove of the separator brings the large thrombus into the near end of the outer tube, the large thrombus can be cracked and crushed by the extrusion between the edge of the groove and the outer tube, so that the outer tube is prevented from being blocked;

(3) the near end of the outer tube is provided with a side hole, when the middle part of the separator blocks the outer tube opening, blood in the blood vessel is sprayed inwards from the side hole under the action of the peristaltic pump to impact thrombus entering the inside, so that the thrombus is further crushed, and the thrombus is discharged favorably.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of the push-pull member pushed to the most distal end;

FIG. 4 is a schematic view of the push-pull member pulled proximally;

FIG. 5 is a schematic diagram of the separator;

FIG. 6 is a schematic view of a separator with three grooves;

FIG. 7 is a schematic structural view of the side hole formed in the proximal end of the outer tube;

FIG. 8 is a schematic view showing the distribution structure of a plurality of side holes spirally arranged on an outer tube.

In the figure: separator 1, inner tube 2, outer tube 3, end connection 4, recess 5, draw liquid mouth 6, cylinder chamber 7, push-and-pull 8, slip cylinder section 9, handheld section 10, sealing washer 11, locking cap 12, peristaltic pump 13, stock solution bag 14, side opening 15.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.

The proximal and distal ends (tail ends) are referred to herein as the torso of a human body. The proximal end is the end that is proximal to the torso and the opposite end that is distal to the torso is the distal (tail) end.

As shown in fig. 1 to 8, a thrombus extraction catheter comprises a separator 1, an inner tube 2, an outer tube 3, and a tail end connector 4;

the separator 1 is in a spindle-shaped structure, the separator 1 is coaxially fixed at the near end of the inner tube 2, a wire guide hole communicated with the inner tube 2 is formed in the separator 1, and at least one groove 5 is formed in the surface of the far end of the separator 1;

when the maximum outer diameter of the middle part of the separator 1 is less than or equal to the inner diameter of the outer pipe 3, the separator can completely enter the outer pipe 3; when the outer diameter of the separator 1 is larger than the inner diameter of the outer pipe 3, the separator 1 can partially enter the outer pipe 3; the two conditions can achieve the effects of cracking and crushing the massive thrombus to different degrees;

the far end of the outer tube 3 is hermetically connected with the near end of the tail end connecting piece 4, one side of the middle part of the tail end connecting piece 4 is provided with a liquid pumping port 6 which is connected with the outside, and the inner tube 2 is arranged in the outer tube 3.

Example 1

The far end of the inner tube 2 is fixed with a push-pull piece 8, the push-pull piece 8 is provided with a sliding cylindrical section 9 and a handheld section 10, and the sliding cylindrical section 9 is hermetically arranged at the far end of the tail end connecting piece 4. Specifically, 4 inside cylinders chamber 7 that are equipped with of trailing end connection spare, 7 near-ends of cylinders chamber and 3 sealed intercommunications of outer tube, 7 distal ends in cylinders chamber are equipped with circular opening, insert complex push-and-pull 8 in the cylinders chamber 7, push-and-pull 8 is equipped with slip cylinder section 9 and

handheld section

10, 8 inside hollow hole that runs through along the axis that is equipped with of push-and-pull, 2 distal ends of inner tube insert in the hollow hole of push-and-pull 8, and sealed fixed, push-and-pull 8 slip cylinder section 9 inserts in cylinders chamber 7 from circular opening, tight cover is equipped with sealing washer 11 on the slip cylinder section 9, 7 distal ends in cylinders chamber are fixed with locking cap 12 that compresses tightly sealing washer 11.

The liquid pumping port 6 of the tail end connecting piece 4 is connected with a peristaltic pump 13 through a pump pipe, and the liquid outlet end of the peristaltic pump 13 is connected with a liquid storage bag 14 through a pump pipe.

The far end of the inner tube 2 and the hollow hole of the push-pull piece 8 are sealed and fixed through glue.

The middle part of the locking cap 12 is provided with a hollow hole, and the inner diameter of the hollow hole is not less than the outer diameter of the sliding cylindrical section 9 of the push-pull piece 8.

The locking cap 12 is fixed with the end of the tail end connecting piece 4 through screw connection or glue.

The distal surface of the separator 1 is provided with a plurality of grooves 5, and the plurality of grooves 5 are evenly distributed along the circumference.

The proximal side of the outer tube 3 is provided with at least one side hole 15.

The working principle is as follows:

before the operation starts, the push-pull rod 8 is pushed until the separator 1 is completely exposed outside the outer tube 3, the near end of the outer tube 3 is placed in the physiological saline, the peristaltic pump 13 is started to suck the physiological saline into the liquid storage bag 14, when the physiological saline is visible in the liquid storage bag 14, the suction is stopped, and the thrombus is emptied to take out the air in the outer tube 3; the push-pull rod 8 is withdrawn to the maximum outside diameter of the middle of the separator 1 and aligned with the proximal port of the outer tube 3.

During the operation, puncture the blood vessel, and guide wire (not shown) is led in until the blood vessel completely passes through the lesion (thrombus); the inner tube 2 of the thrombus taking-out catheter is conveyed to a position, which is 1-2cm close to thrombus, of the separator 1 under the guidance of a guide wire, a peristaltic pump 13 is started, the outer tube 3 is slowly pushed to the thrombus part, and meanwhile, a push-pull rod 8 is moved back and forth in a reciprocating mode; the thrombus is sucked into the outer tube 3 and discharged to the outside of the body into the liquid storage bag 14 by the peristaltic pump 13 and the reciprocating separator 1.

After the thrombus is sucked, all the devices are removed from the human body together.

The separator 1 is arranged at the near end of the inner tube 2, the groove 5 is arranged on the surface of the far end of the fusiform separator 1, the separator 1 is moved back and forth by the push-pull piece 8 and the inner tube 2, the groove 5 of the separator 1 can bring thrombus near the near end of the outer tube 3 into the outer tube 3, the extraction efficiency of the peristaltic pump 13 is improved, and when the flow of a liquid extraction port is fixed, the fluctuation suction force generated at the near end of the outer tube 3 is favorable for separating the thrombus from the vascular wall under the suction action of the sliding cylindrical section 9 of the push-pull piece 8 and the tail end connecting piece 4;

in addition, for larger thrombus, after the groove 5 of the separator 1 brings the large thrombus into the near end of the outer tube 3, the large thrombus can be cracked and crushed by the extrusion between the edge of the groove 5 and the outer tube 3, so that the outer tube 3 is prevented from being blocked;

the near end of the outer tube 3 is provided with a side hole 15, when the middle part of the separator 1 blocks the opening of the outer tube 3, blood in the blood vessel is sprayed inwards from the side hole 15 under the action of the peristaltic pump 13 to impact thrombus entering the inside, so that the thrombus is further crushed, and the thrombus is favorably discharged.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A thrombus extraction catheter is characterized by comprising a separator, an inner tube, an outer tube and a tail end connecting piece;

2. A thrombus extraction catheter according to claim 1, wherein a push-pull member is fixed to a distal end of said inner tube, and the push-pull member is provided with a sliding cylindrical section and a handle section, and the sliding cylindrical section is sealingly mounted to a distal end of the tail end connecting member.

3. A thrombus extraction catheter according to claim 1, wherein the outer tube is provided at its proximal end side with at least one side hole.

4. A thrombus extraction catheter according to claim 1, wherein the distal surface of the separator is provided with a plurality of grooves which are uniformly distributed circumferentially.

5. The thrombus extraction catheter according to claim 2, wherein the sliding cylindrical section is tightly sleeved with a sealing ring, a locking cap for pressing the sealing ring is fixed at the distal end of the tail end connector, a hollow hole is formed in the middle of the locking cap, and the handheld section penetrates through the hollow hole of the locking cap.