CN114767212A - Thrombus aspiration system - Google Patents

Abstract

The invention belongs to the field of medical instruments, and relates to a thrombus suction system which comprises a suction catheter, a stirring rod, a motor driver structure, a negative pressure generator and a thrombus collector, wherein a suction port is formed in the front far end of the suction catheter, a stirring head is arranged at the far end of the stirring rod, the near end of the stirring rod is connected with the motor driver, the motor driver structure drives the stirring rod to rotate, the front end of the stirring rod extends into the suction catheter, the stirring head is positioned at the suction port, and the suction structure of the negative pressure generator is connected with the suction catheter to provide suction force. The invention prevents thrombus from blocking the catheter in the suction process by destroying and stirring thrombus through the stirring head of the suction port; the distance between the suction catheter and the thrombus is detected through the sound wave detector, and the opening and closing of the negative pressure switch valve are controlled in real time; the negative pressure value change in the thrombus aspiration process is monitored by combining the negative pressure monitoring sensor, the aspiration negative pressure value is accurately controlled, and finally the blood loss is reduced as far as possible.

Description

A thrombus aspiration system

technical field

The invention belongs to the field of medical devices, and relates to a thrombus suction system.

Background technique

Thrombosis refers to the agglutination or coagulation of certain components in the blood, thereby blocking the blood vessel and blocking the blood flow. The current conventional treatment methods are mechanical thrombectomy and drug thrombolysis. Clinical results show that mechanical thrombectomy has a more significant effect than drug thrombolysis, which also establishes the dominant position of mechanical thrombectomy in thrombus treatment. The most frequently used mechanical thrombectomy today is the thrombectomy stent. The thrombectomy stent enters the human blood vessel with the catheter, and after entering the preset position of the blood vessel, it self-expands to form a mesh lumen, and then the thrombectomy stent is recovered and the thrombus blocking the blood vessel is taken out of the body. However, due to the structure of the thrombectomy stent, the mesh lumen formed by the thrombectomy stent is relatively large, so it cannot completely fix and remove all thrombus, which is prone to thromboembolism. In addition, the thrombectomy stent needs an additional thrombus collector, which is relatively difficult to operate. It is cumbersome, and the effect of bolt removal is closely related to the operator's technology and experience.

To this end, thrombus suction catheters with different structures have been developed at home and abroad to suction thrombus in human blood vessels. The design of wall, wide lumen and single-lumen tube ensures smooth and efficient performance of thrombus suction; the outer edge of the distal surface of the tapered tube segment is rounded, which facilitates the overall entry of the thrombus suction catheter into the blood vessel and reduces damage to the human body; The end is provided with a spirally distributed oval side hole, which is convenient for the smooth suction of larger thrombus in the blood vessel, so as to prevent the situation that the larger thrombus cannot be sucked, so that the thrombus in the blood vessel can be completely sucked, and the best treatment effect can be achieved. However, multiple elliptical side holes are arranged on the side of the tube body. Since the thrombus is mostly at the front end of the catheter when the catheter is in the entry state, the suction effect of the elliptical side holes is not obvious, and the arrangement of multiple elliptical side holes will affect the overall support performance of the catheter.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a thrombus suction system. By setting a crushing structure in the suction catheter, while the thrombus is sucked to the suction catheter, the thrombus is chopped at the catheter port to facilitate the suction of the thrombus.

The present invention adopts the following technical scheme:

A thrombus suction system includes a suction catheter, a crushing rod, a motor drive structure, a negative pressure generator and a thrombus collector, the suction catheter has a suction port at the distal end, and the distal end of the crushing rod is provided with a stirring rod. The crushing head, the proximal end of the crushing rod is connected to the motor driver, the crushing rod is driven to rotate by the motor driver structure, the crushing rod extends into the suction conduit, and the crushing head is located in the suction pipe The suction structure of the negative pressure generator is connected to the suction conduit to provide suction force.

In the above technical solution, when the thrombus is contacted, the motor driver structure and the negative pressure generator are activated, and the crushing rod rotates under the driving of the motor driver structure. At the same time, the suction force generated by the negative pressure generator sucks the thrombus to the suction port, and then crushes and destroys the thrombus by the crushing head, and finally sucks the thrombus into the thrombus collector.

In the above technical solution, the suction port is only provided at the distal end of the suction catheter, which has no adverse effect on the overall support performance of the suction catheter.

As a preferred option of the above technical solution, the thrombus suction system further includes an acoustic wave detector located at the suction port of the suction catheter, and the acoustic wave detector is connected to the motor driver structure and the negative pressure through a signal wire fixed in the suction catheter Negative pressure switching valve occurs. If the sound wave detector detects that the suction port has come into contact with the thrombus, or the distance from the thrombus is within a certain range, the motor drive structure will be activated to rotate the crushing head, and at the same time, the negative pressure switch valve will be opened to suck the thrombus; When the distance to the thrombus or the detected thrombus and the suction port is greater than a certain value, the motor drive structure stops, and at the same time, the negative pressure switch valve is closed.

As a preferred option of the above technical solution, the acoustic wave detector, the motor driver structure and the signal wire of the negative pressure switch valve are fixed between the metal braid and the outer tube by heat shrinking the outer tube of the suction catheter.

During the suction process, because the distance between the suction port of the suction catheter and the thrombus cannot be measured, the timing of starting negative pressure suction cannot be precisely controlled, which often leads to premature blood suction before the thrombus is suctioned, or After the thrombus is suctioned, blood is still drawn, which increases blood loss. This solution detects the distance between the suction port of the suction catheter and the thrombus in real time by setting the acoustic wave detector. For example, the acoustic wave detector at the distal end of the suction catheter detects that the suction port has contacted the thrombus, or the distance from the thrombus is within Within a certain range, the crushing rod in the suction catheter is activated (to crush and destroy the thrombus), and the negative pressure switch valve is opened at the same time, so that the thrombus can be smoothly drawn back into the thrombus collector; when the sound wave at the distal end of the suction catheter Detector, when no thrombus is detected or the distance between the detected thrombus and the suction port is greater than a certain value, the motor drive structure stops, and at the same time, the negative pressure switch valve is closed; then, the doctor is prompted to continue to push the suction catheter forward until The sound wave detector detects the thrombus again, and the above process is repeated until the thrombus is completely aspirated.

In the present invention, it is further preferred that the negative pressure negative generator is connected with a negative pressure monitoring sensor. The negative pressure monitoring sensor is connected to the negative pressure generator through the signal wire, and can monitor the negative pressure value in the suction catheter in real time, so as to dynamically adjust the power of the negative pressure generator to precisely control the negative pressure value of suction and reduce the suction as much as possible. blood loss.

As a preferred option of the above technical solution, the suction port of the suction catheter is at an inclination angle of 20° to 90°. Within this angular range, the thrombus is more likely to be drawn into the catheter, and the disrupted thrombus mass does not scatter beyond the suction range.

More preferably, the suction port of the suction conduit has an inclination angle of 40°˜60°.

As a preferred option of the above technical solution, the crushing rod is in a spiral shape, and during the rotation process, there is a force to push back the thrombus, which is beneficial to the suction of the thrombus.

As a preferred option of the above technical solution, the suction catheter includes a catheter outer lumen and a catheter inner lumen, the crushing rod is located in the catheter inner lumen, and the catheter outer lumen is for the passage of a guide wire or spraying thrombolytic drugs or other use.

As a preference of the above technical solution, the crushing rod and the crushing head are made of 304 stainless steel or 316 stainless steel, and the outer layer of the metal needs to be covered with a thin-walled tube formed of a high molecular polymer such as polyamide. The thin-walled tube is conducive to the smooth passage of instruments in the pipeline, and can also protect the metal tube from bending.

As a preference of the above technical solution, the shape of the crushing head includes circle, triangle, rhombus, ellipse, spherical and the like.

More preferably, the surface of the crushing head has spine-like protrusions, which is more conducive to breaking up the thrombus.

As a preferred option of the above technical solution, a visualization mark, such as a medical catheter imaging ring, is provided at the distal end of the suction catheter, which is used to confirm the position of the suction catheter in the blood vessel.

By implementing the above-mentioned technical scheme, the present invention has the following beneficial effects:

1. The present invention destroys and smashes the thrombus through the crushing head of the suction port, preventing the thrombus from blocking the catheter during the suction process, and at the same time, enables the suction catheter to aspirate the thrombus under a smaller suction pressure, thereby reducing the thrombus. blood loss.

2. The present invention detects the distance between the suction catheter and the thrombus through an acoustic wave detector, and controls the opening and closing of the negative pressure switch valve in real time, so as to reduce blood loss.

3. The present invention monitors the change of the negative pressure value during the thrombus suction process through the negative pressure monitoring sensor, and dynamically adjusts the power of the negative pressure generator to precisely control the suction negative pressure value so as to reduce blood loss.

4. The present invention also optimizes the design of the suction port of the suction catheter and the structure of the crushing rod, so that the thrombus can be smoothly sucked into the collector, thereby reducing blood loss.

Description of drawings

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

2 is a cross-sectional view of a suction catheter according to an embodiment of the present invention.

In the figure: 1-negative pressure generator; 2-thrombus collector; 3-negative pressure switch valve; 4-negative pressure monitoring sensor; 5-motor driver; 6-sound wave detector; 7-crushing head; 8-stirring Broken rod; 9-suction catheter; 10-developing ring; 11-catheter outer lumen; 12-signal wire of sound wave detector; 13-catheter lumen.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example

The present invention provides a thrombus suction system, which is used to remove the thrombus blocking the blood vessel, and further improves the existing suction system. specifically,

The thrombus suction system of this embodiment includes a suction catheter 9, a crushing rod 8, a motor driver 5 and a negative pressure suction system.

The negative pressure suction system includes a negative pressure generator 1, a thrombus collector 2 (with a filter inside, which can filter the suctioned thrombus), and a negative pressure switch valve 3 (used to control the negative pressure suction system and suction catheter. connection between) and negative pressure monitoring sensor 4;

The suction catheter has two lumens, one is the inner lumen 13 of the catheter, and the other is the outer lumen 11 of the catheter. The distal end of the outer lumen of the catheter is provided with a port, and the distal end of the inner lumen of the catheter is opened with a suction port. The angle of inclination from ° to 90° is preferably 40° to 60°, and in this embodiment, it is 45°. The outer lumen of the catheter is used for passing the guide wire or spraying thrombolytic drugs or other purposes. A developing ring 10 is provided at the distal end of the suction catheter.

The crushing rod is in a spiral shape, and the distal end of the crushing rod (near the suction port end) is provided with a crushing head 7. The two are integrated structure. The crushing rod and the crushing head are both made of metal material, which can be 304 stainless steel. Or 316 stainless steel. The shape of the crushing head includes circle, triangle, rhombus, ellipse, sphere, etc. In this embodiment, a sphere is used. The crushing rod is inserted into the catheter lumen of the suction catheter, and the crushing head is located in the middle area of the inclination angle, so that after crushing the thrombus, it is just sucked into the suction catheter and will not spread into the blood vessel again.

In order to ensure the smooth passage of the crushing rod and the crushing head in the pipeline, a layer of polyamide thin-walled pipe is wrapped on the outer surface of the crushing rod and the crushing head.

The motor driver is connected with the crushing rod in the suction conduit through a transmission mechanism, so as to realize the control of the rotation of the crushing rod and the crushing head.

In another specific embodiment, the suction port of the suction catheter is provided with an acoustic wave detector 6, which is electrically connected to the motor driver and the negative pressure switch valve through the signal wire 12. The acoustic wave detector adopts an intravascular ultrasound probe to detect the position of the thrombus. In addition, the acoustic wave detector and the motor driver structure and the signal wire of the negative pressure switch valve are fixed between the metal braid and the outer tube through the heat shrinking of the outer tube of the suction catheter.

Start the negative pressure generator to generate a specific negative pressure value, and at the same time close the switch valve to maintain a certain internal negative pressure value. When the suction catheter is pushed along the guide wire in the guide wire lumen, it is pushed to the vicinity of the stenotic area of the blood vessel (that is, the area where thrombus occlusion is detected during angiography). The acoustic wave detector at the front end of the suction catheter detects the distance between the suction port of the suction catheter and the thrombus in real time. Within a certain range, the crushing rod in the suction catheter is activated (to crush and destroy the thrombus), and the negative pressure switch valve is opened at the same time, so that the thrombus can be smoothly drawn back into the thrombus collector; With the acoustic wave detector, when no thrombus is detected or the distance between the detected thrombus and the suction port is greater than a certain value, the motor drive structure stops, and at the same time, the negative pressure switch valve is closed; then, the doctor is prompted to continue to push the suction catheter forward, Until the sound wave detector detects the thrombus again, the above process is repeated, and finally the thrombus is completely aspirated.

When the negative pressure switch valve is opened and the thrombus is sucked by the negative pressure generator, the negative pressure value in the suction catheter can be monitored in real time through the negative pressure monitoring sensor, so as to dynamically adjust the power of the negative pressure generator to precisely control the suction. The negative pressure value of suction to reduce blood loss as much as possible. When the difference between the negative pressure in the pipeline monitored by the negative pressure monitoring sensor and the negative pressure generated by the negative pressure generator is less than a certain value, it indicates that the thrombus can be drawn into the thrombus collector normally, and the system prompt light is green. The equipment is running normally; when the difference between the negative pressure monitored in the pipeline and the negative pressure of the negative pressure generator is greater than or equal to a certain value, it indicates that the thrombus has blocked the pipeline or the thrombus is stuck in the pipeline, and the system prompt light is yellow , at this time, it is necessary to gradually increase the negative pressure value of the negative pressure generator (to the maximum negative pressure value of the equipment) until the negative pressure difference is less than a certain value, and then the negative pressure value in the negative pressure generator gradually decreases until it drops to The initial setting value of the equipment; but if the negative pressure value of the negative pressure generator is increased to the maximum negative pressure value, the difference between the negative pressure monitored in the pipeline and the negative pressure of the negative pressure generator is still greater than or equal to a certain value, It indicates that the device cannot suction the thrombus, and the system prompt light is red, indicating that the doctor needs to remove the suction catheter and use other measures to complete the operation.

Claims (9)

1. a thrombus suction system, comprising a suction catheter and a thrombus collector, characterized in that, also comprising a crushing rod, a motor driver structure and a negative pressure generator, the distal end of the suction catheter has a suction port, The distal end of the crushing rod is provided with a crushing head, the proximal end of the crushing rod is connected to the motor driver, the motor driver structure drives the crushing rod to rotate, and the distal end of the crushing rod extends into the suction In the conduit, and the crushing head is located at the suction port, the suction structure of the negative pressure generator is connected to the suction conduit to provide suction force, and the negative pressure generator is connected with a negative pressure monitoring sensor. 2. A thrombus suction system according to claim 1, characterized in that, further comprising an acoustic wave detector provided at the suction port of the suction catheter, the acoustic wave detector passing through the The signal wire is connected to the motor driver structure and the negative pressure switch valve where the negative pressure occurs. 3 . The thrombus suction system according to claim 1 , wherein the suction port of the suction catheter is at an inclination angle of 20° to 90°. 4 . 4 . The thrombus suction system according to claim 3 , wherein the suction port of the suction catheter is at an inclination angle of 40°˜60°. 5 . 5 . The thrombus suction system according to claim 1 , wherein the crushing rod is helical. 6 . 6 . The thrombus suction system according to claim 1 , wherein the suction catheter comprises a catheter outer lumen and a catheter inner lumen, and the crushing rod is located in the catheter inner lumen. 7 . 7 . The thrombus suction system according to claim 1 , wherein the outer layers of the crushing rod and the crushing head are covered with thin-walled tubes formed of high molecular polymers. 8 . 8 . The thrombus suction system according to claim 1 , wherein the surface of the crushing head has spine-like protrusions. 9 . 9 . The thrombus suction system according to claim 1 , wherein a visualization mark is provided at the distal end of the suction catheter. 10 .

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