Thrombus aspiration catheter

Abstract

The utility model relates to the technical field of medical instruments, and provides a thrombus aspiration catheter. The body comprises a shell, a rotary driving part and a movable driving part, and the rotary driving part and the movable driving part are connected to the shell; an inner tube; a first side suction port is formed in the inner pipe; the inner pipe is sleeved with the middle pipe, and a second side suction opening is formed in the middle pipe; the middle pipe is sleeved with the outer pipe, and a third side suction opening is formed in the outer pipe; the far end of the outer tube is formed by retracting from the far end of the middle tube to the near end of the middle tube; the middle pipe is sleeved with the support, the support is arranged in a half circle in the circumferential direction, and the two ends of the support are connected with the far end of the outer pipe and the far end of the middle pipe respectively; the rotary driving part drives the inner pipe to rotate; the movable driving part is connected with the near end of the outer tube and drives the outer tube to move horizontally relative to the middle tube. The thrombus aspiration catheter can aspirate adherent old thrombus or thrombus in complex blood vessels, can adapt to more intracavity thrombus symptoms, and is faster and safer.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a thrombus aspiration catheter. Background Art

[0002] Thrombus can hinder or block normal blood flow, and may even break off and transfer to an organ in the human body with the blood, blocking the blood supply to the organ, with very serious consequences. Thrombus aspiration catheter is a common mechanical thrombectomy device, which is often used in interventional surgery for cerebral thrombosis.

[0003] In actual surgical procedures, thrombus aspiration catheters are being used as mechanical thrombus removal techniques and have become an important clinical method. This method can quickly aspirate thrombi and quickly clear blood vessels. However, simple aspiration catheters are mainly used for fresh thrombi or free thrombi, but are not effective for subacute thrombi and old thrombi, especially when encountering some curved blood vessels or clots attached to the wall.

[0004] The patent document with the publication number CN115778484A discloses a thrombus aspiration catheter. The thrombus aspiration catheter comprises: a catheter body, an adjustment structure and a control component; the adjustment structure is arranged at the distal end of the catheter body, the adjustment structure can expand and contract radially and is used to adjust the suction position of the suction port of the catheter body; the control component is connected to the adjustment structure and is used to control the expansion and contraction of the adjustment structure. The embodiment of the present invention can adjust the suction position of the suction port by controlling the expansion of the adjustment structure arranged at the distal end of the catheter body, so that the thrombus in the special position that is difficult to be aspirated by the traditional catheter can be effectively aspirated. This patent uses a side mechanism to offset the suction port to one side of the blood vessel, and then aspiration is performed. However, this patent still essentially only uses negative pressure aspiration, but the thrombus attached to the wall is more subacute or chronic thrombus, which is tightly adhered to the blood vessel wall and cannot be aspirated out by simple aspiration.

[0005] Therefore, in view of the current demand for thrombus aspiration catheters, there is an urgent need to develop a thrombus aspiration catheter that has a wide range of indications, is easy to operate, and can aspirate more adherent thrombi. Utility Model Content

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art.

[0007] In order to solve the above technical problems, the utility model provides a thrombus aspiration catheter, comprising:

[0008] A body, comprising a housing and a rotation driving part and a movement driving part connected to the housing;

[0009] An inner tube, a part of which is located in the outer shell and another part of which is located outside the outer shell; a first side suction port is provided on the inner tube;

[0010] The middle tube is sleeved outside the inner tube, and a second side suction port is provided on the middle tube;

[0011] The outer tube is sleeved outside the middle tube, and a third side suction port is provided on the outer tube; the distal end of the outer tube is retracted from the distal end of the middle tube toward the proximal end thereof;

[0012] The bracket is sleeved outside the middle tube and is arranged half a circle along the circumferential direction, and the two ends of the bracket are respectively connected to the distal end of the outer tube and the distal end of the middle tube;

[0013] Among them, the rotation driving unit is connected to the proximal end of the inner tube, and the rotation driving unit drives the inner tube to rotate so that the second side suction port is connected with the first side suction port; the movement driving unit is connected to the proximal end of the outer tube, and the movement driving unit drives the outer tube to translate relative to the middle tube so that the third side suction port is connected with the second side suction port and the shape of the bracket is adjusted.

[0014] In one embodiment of the present invention, a distal suction port is provided at the distal end of the intermediate tube.

[0015] In one embodiment of the present invention, the cross-section of the distal suction port is an oblique port, which includes a first side and a second side opposite to the first side, the length of the second side is longer than the length of the first side, and the second side is located on the side of the intermediate tube connected to the bracket.

[0016] In one embodiment of the present invention, the opening size of the second side suction port is not smaller than the opening size of the first side suction port.

[0017] In one embodiment of the present invention, the opening size of the third side suction port is larger than the opening size of the second side suction port.

[0018] In one embodiment of the utility model, the mobile driving part includes a thumb drive and a first connecting tube connected to the thumb drive, the top end of the thumb drive is exposed from the outer shell and moves back and forth along the axial direction of the outer tube, the first connecting tube is connected to the bottom end of the thumb drive, and the first connecting tube is sealed and connected to the proximal end of the outer tube.

[0019] In one embodiment of the utility model, the rotation driving part includes a driving member and a second connecting tube; one end of the driving member is connected to the second connecting tube, and the other end of the driving member extends from the inside of the outer shell to the outside thereof; the second connecting tube is sealed and connected to the proximal end of the inner tube; the driving member drives the inner tube to rotate.

[0020] In one embodiment of the utility model, the present application also includes a fourth connecting tube connected to the proximal end of the outer shell; the distal end of the fourth connecting tube is located in the outer shell and is sleeved on the inner tube, and the proximal end of the fourth connecting tube extends out of the outer shell; the fourth connecting tube is sealed and connected to the proximal end of the inner tube and is interconnected.

[0021] In one embodiment of the present invention, the distal end of the intermediate tube is provided with a developing ring.

[0022] In one embodiment of the present invention, the outer surface of the outer tube is coated with a lubricating coating.

[0023] The above technical solution of the utility model has the following advantages compared with the prior art:

[0024] The thrombus aspiration catheter described in the utility model has both conventional thrombus aspiration functions and can also aspirate old thrombi adherent to the wall or thrombi in complex blood vessels. It can adapt to more intracavitary thrombosis symptoms and is a faster and safer thrombus aspiration catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0026] Figure 1 This is a front view of a thrombus aspiration catheter in a preferred embodiment of the utility model;

[0027] Figure 2 yes Figure 1 A cross-sectional view of

[0028] Figure 3 yes Figure 2 A magnified image of point A;

[0029] Figure 4 The utility model is used to extract blood clots. Figure 1 ;

[0030] Figure 5 The utility model is used to extract blood clots. Figure 2 ;

[0031] Figure 6 The utility model is used to extract blood clots. Figure 3 ;

[0032] Figure 7 The utility model is used to extract blood clots. Figure 4 ;

[0033] Description of the accompanying drawings in the specification: 1, housing; 101, avoidance groove;

[0034] 2. inner tube; 201. first side suction port;

[0035] 3. Intermediate tube; 301. Second side suction port; 302. Distal suction port; 303. Third connecting tube; 304. Intermediate tube cleaning joint;

[0036] 4. outer tube; 401. third side suction port;

[0037] 5. Bracket;

[0038] 6. Mobile driving unit; 601. Thumb driving unit; 602. First connecting pipe; 603. External pipe cleaning joint;

[0039] 7. Rotation driving unit; 701. Driving member; 702. Second connecting pipe;

[0040] 8. Stress relief head;

[0041] 9. Fourth connecting pipe;

[0042] 10. Blood clots;

[0043] 11. Guide wire. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0045] Reference Figure 1 to Figure 3 As shown, the embodiment of the utility model provides a thrombus aspiration catheter, comprising:

[0046] The main body comprises a housing 1 and a rotation driving part 7 and a movement driving part 6 connected to the housing 1;

[0047] The inner tube 2 has a portion located in the outer shell 1 and another portion located outside the outer shell 1; the inner tube 2 is provided with a first side suction port 201;

[0048] The middle tube 3 is sleeved outside the inner tube 2, and a second side suction port 301 is provided on the middle tube 3;

[0049] The outer tube 4 is sleeved outside the middle tube 3, and a third side suction port 401 is provided on the outer tube 4; the distal end of the outer tube 4 is retracted from the distal end of the middle tube 3 to the proximal end thereof;

[0050] The bracket 5 is sleeved outside the middle tube 3 and is arranged half a circle along the circumference. The two ends of the bracket 5 are respectively connected to the distal end of the outer tube 4 and the distal end of the middle tube 3. The connection method can be glue bonding, polymer hot melting or polymer welding. The bracket 5 can be made of nickel-titanium alloy material, or metal materials such as platinum wire or stainless steel. Preferably, the bracket 5 is woven from multiple strands of metal wire, wherein the metal wire can contain one or more platinum-iridium wires, which can improve the visualization of the bracket 5 during surgery. In some other embodiments, the bracket 5 can also be made by laser cutting.

[0051] The rotation driving unit 7 is connected to the proximal end of the inner tube 2, and the rotation driving unit 7 drives the inner tube 2 to rotate, so that the second side suction port 301 is connected to the first side suction port 201; the movement driving unit 6 is connected to the proximal end of the outer tube 4, and the movement driving unit 6 drives the outer tube 4 to translate relative to the middle tube 3, so that the third side suction port 401 is connected to the second side suction port 301 and the shape of the bracket 5 is adjusted. The first side suction port 201, the second side suction port 301 and the third side suction port 401 are set to suction the thrombus in a targeted manner, especially for curved blood vessels or blood vessels attached to the wall.

[0052] Specifically, the mobile driving unit 6 in this embodiment drives the outer tube 4 to move toward the proximal end so that the stent 5 is unfolded and attached to the middle tube 3; in this way, when the thrombus aspiration catheter enters the blood vessel, the stent 5 fits with the middle tube 3, reducing the outer diameter and facilitating the introduction. The mobile driving unit 6 drives the outer tube 4 to move toward the distal end so that the stent 5 is propped up, so that when the thrombus is reached, the outer tube 4 can be slowly moved toward the distal end according to actual needs, and the stent 5 can be propped up so that the distal suction port 302 can be biased to one side of the thrombus, which is convenient for aspirating the clotted thrombus. In addition, in this embodiment, the support diameter of the stent 5 and the shape of the stent 5 can be freely adjusted, and the reaction force between the stent 5 and the blood vessel wall can be used to adjust the distal suction port 302 to a reasonable suction position, so that a better suction effect can be provided for thrombus in a special position. The clotted thrombus can also be separated and cut by the stent 5, and then the thrombus can be aspirated out of the body by the side suction port. In addition, the stent 5 plays a protective role at the distal end to prevent the cut embolus from being free to other parts of the body and causing secondary damage.

[0053] In addition, the rotation drive unit 7 drives the inner tube 2 to rotate, and the first side suction port 201 of the inner tube 2 can be connected with the second side suction port 301 of the middle tube 3 to facilitate the extraction of the thrombus; and the degree of connection between the first side suction port 201 and the second side suction port 301 can be controlled by the angle of rotation, thereby adjusting the size of the thrombus area that can be inhaled.

[0054] When encountering a wall-attached thrombus that cannot be directly aspirated, one side of the stent 5 can be positioned at the thrombus, and the inner tube 2 can be rotated to connect the first side suction port 201, the second side suction port 301 and the third side suction port 401, and then the outer tube 4 is moved to prop up the stent 5, and the thrombus is peeled off from the blood vessel wall by using the stent 5 and cooperating with the side suction port to aspirate the thrombus out of the body.

[0055] It can be seen that this embodiment has both conventional thrombus aspiration function and can also aspirate old adherent thrombi or complex intravascular thrombi. It can adapt to more intracavitary thrombosis symptoms and is a faster and safer thrombus aspiration catheter.

[0056] This embodiment not only meets the function of conventional thrombus aspiration, but also has excellent aspiration effect for thrombi in special locations. The thrombus aspiration catheter of this invention has the advantages of being easy to use, safe, effective, and multifunctional.

[0057] Further, a distal suction port 302 is provided at the distal end of the intermediate tube 3. The cross section of the distal suction port 302 is an oblique port, and the oblique port includes a first side and a second side opposite to the first side, the length of the second side is longer than the length of the first side, and the second side is located on the side of the intermediate tube 3 connected to the stent 5. Specifically, this facilitates the distal suction port 302 to align with the thrombus during the deviation process. Thrombus at different positions can be sucked through the distal suction port 302 and the first side suction port 201.

[0058] Furthermore, the opening size of the second side suction port 301 is not less than the opening size of the first side suction port 201. In this way, the second side suction port 301 can completely cover the first side suction port 201, thereby facilitating efficient removal of thrombus.

[0059] Further, the opening size of the third side suction port 401 is larger than the opening size of the second side suction port 301. Specifically, this can ensure that the third side suction port 401 always covers the second side suction port 301 during the movement of the outer tube 4.

[0060] Further, the mobile driving unit 6 includes a thumb driving unit 601 and a first connecting tube 602 connected to the thumb driving unit 601. The top of the thumb driving unit 601 is exposed from the housing 1 and moves forward and backward along the axial direction of the outer tube 4. For example, the housing 1 is provided with a slide groove at the position where the thumb driving unit 601 is provided. The top of the thumb driving unit 601 extends out of the slide groove, and the middle of the thumb driving unit 601 moves forward and backward in the slide groove. The first connecting tube 602 is connected to the bottom end of the thumb driving unit 601, and the first connecting tube 602 is sealed and connected to the proximal end of the outer tube 4. Specifically, the mobile driving unit 6 of this embodiment has a simple structure and is convenient and quick to operate.

[0061] Furthermore, the rotation drive unit 7 includes a driving member 701 and a second connecting tube 702; one end of the driving member 701 is connected to the second connecting tube 702, and an avoidance groove 101 is provided on the outer shell 1, and the other end of the driving member 701 is connected to extend from the inside of the outer shell 1 through the avoidance groove 101 to the outside of the outer shell 1; the second connecting tube 702 is sealed and connected to the proximal end of the inner tube 2; the driving member 701 slides up and down in the avoidance groove 101 so as to drive the inner tube 2 to rotate.

[0062] Furthermore, a stress relief head 8 is provided at the distal end of the housing 1, and the stress relief head 8 is provided with a through hole, through which the outer tube 4 passes. The stress relief head 8 can be made of a polymer material such as silicone, latex or pebax. The stress relief head 8 can provide good flexible support performance to prevent the catheter from being bent.

[0063] Furthermore, the present application further includes a fourth connecting tube 9 connected to the proximal end of the outer shell 1; the distal end of the fourth connecting tube 9 is located in the outer shell 1 and is sleeved on the inner tube 2, and the proximal end of the fourth connecting tube 9 extends out of the outer shell 1; the fourth connecting tube 9 is sealedly connected to the proximal end of the inner tube 2 and communicates with each other. Specifically, the fourth connecting tube 9 connects the inner tube 2 with the outer shell 1, so that when the inner tube 2 rotates relative to the outer shell 1, the friction between the two is avoided to prevent the inner tube 2 from being damaged.

[0064] In some embodiments, the present application further includes a third connecting tube 303 sealedly connected to the proximal end of the intermediate tube 3, and the third connecting tube 303 is provided with an intermediate tube cleaning joint 304 extending out of the housing 1. The first connecting tube 602 is provided with an outer tube cleaning joint 603 extending out of the housing 1. Specifically, a syringe can be used to draw physiological saline and then flush the inner tube 2, the intermediate tube 3, and the outer tube 4 through the proximal end of the fourth connecting tube 9, the intermediate tube cleaning joint 304, and the outer tube cleaning joint 603 respectively.

[0065] Furthermore, the distal end of the intermediate tube 3 is provided with a developing ring, thereby improving the developing performance during the operation.

[0066] Furthermore, the outer surface of the outer tube 4 is coated with a lubricating coating, thereby facilitating introduction into the blood vessel and reducing damage to the blood vessel.

[0067] The application process for this application is as follows:

[0068] During the operation, conventional pre-operation is first performed, including puncturing the blood vessel with the puncture system, then introducing a suitable guide wire 11 through the puncture system and pushing it to the predetermined position, using a syringe to draw physiological saline to respectively flush the fourth connecting tube 9, the middle tube cleaning joint 304 and the outer tube cleaning joint 603, then introducing the guide wire 11 along the inner tube 2, and pushing the thrombus aspiration catheter (hereinafter referred to as "the device") to the predetermined position along the guide wire 11. Then, the connecting tube of the negative pressure aspirator is connected to the fourth connecting tube 9, and the position of the thrombus 10 is observed by angiography. Figure 4 and Figure 5 If the position of the thrombus 10 is special, the thumb drive 601 is moved distally to move the outer tube 4 distally, thereby propping up the stent 5 and utilizing the reaction force between the stent 5 and the blood vessel wall to shift the distal suction port 302 to the thrombus 10, and then the negative pressure suction device is opened to suck the thrombus 10 out of the body;

[0069] When encountering a mural thrombus10, it is impossible to remove it by conventional aspiration, such as Figure 6 and Figure 7As shown, if the thrombus 10 is in a curved blood vessel and cannot be directly aspirated, the suction port 302 at the distal end of the instrument is pushed to the distal end of the thrombus 10, and then the thumb drive 601 is moved distally to move the outer tube 4 distally and prop up the stent 5, and then the inner tube 2 is rotated so that the first side suction port 201 of the inner tube 2 overlaps with the second side suction port 301 of the middle tube 3, the negative pressure suction device is turned on for aspiration and the instrument is slowly moved proximally, and the thrombus 10 is peeled off and drawn out of the body by the propped up stent 5. Finally, the thumb drive 601 is withdrawn to straighten the stent 5 and stick it to the middle tube 3, and the instrument is withdrawn to complete the operation.

[0070] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A thrombus aspiration catheter, characterized in that: include: A body, comprising a housing and a rotation driving part and a movement driving part connected to the housing; An inner tube, a part of which is located in the outer shell and another part of which is located outside the outer shell; a first side suction port is provided on the inner tube; An intermediate tube is sleeved outside the inner tube, and a second side suction port is provided on the intermediate tube; An outer tube is sleeved outside the middle tube, and a third side suction port is provided on the outer tube; the distal end of the outer tube is retracted from the distal end of the middle tube toward the proximal end thereof; A bracket, which is sleeved outside the intermediate tube and is arranged half a circle along the circumferential direction, and the two ends of the bracket are respectively connected to the distal end of the outer tube and the distal end of the intermediate tube; Among them, the rotation driving unit is connected to the proximal end of the inner tube, and the rotation driving unit drives the inner tube to rotate so that the second side suction port is connected to the first side suction port; the movement driving unit is connected to the proximal end of the outer tube, and the movement driving unit drives the outer tube to translate relative to the middle tube, so that the third side suction port is connected to the second side suction port and adjusts the shape of the bracket.

2. The thrombus aspiration catheter according to claim 1, characterized in that: The distal end of the intermediate tube is provided with a distal suction port.

3. The thrombus aspiration catheter according to claim 2, characterized in that: The cross section of the distal suction port is an oblique port, which includes a first side and a second side opposite to the first side, the second side is longer than the first side, and the second side is located on a side of the intermediate tube connected to the bracket.

4. The thrombus aspiration catheter according to claim 1, characterized in that: The opening size of the second side suction port is not smaller than the opening size of the first side suction port.

5. The thrombus aspiration catheter according to claim 1, characterized in that: The opening size of the third side suction port is larger than the opening size of the second side suction port.

6. The thrombus aspiration catheter according to claim 1, characterized in that: The mobile driving part includes a thumb drive and a first connecting tube connected to the thumb drive, the top end of the thumb drive is exposed from the outer shell and moves forward and backward along the axial direction of the outer tube, the first connecting tube is connected to the bottom end of the thumb drive, and the first connecting tube is sealed and connected to the proximal end of the outer tube.

7. The thrombus aspiration catheter according to claim 1, characterized in that: The rotary drive unit includes a drive member and a second connecting tube; one end of the drive member is connected to the second connecting tube, and the other end of the drive member is connected to extend from the inside of the housing to the outside thereof; The second connecting tube is sealedly connected to the proximal end of the inner tube; and the driving member drives the inner tube to rotate.

8. The thrombus aspiration catheter according to claim 1, characterized in that: It also includes a fourth connecting tube connected to the proximal end of the outer shell; the distal end of the fourth connecting tube is located in the outer shell and sleeved on the inner tube, and the proximal end of the fourth connecting tube extends out of the outer shell; The fourth connecting tube is sealedly connected to the proximal end of the inner tube and communicates with each other.

9. The thrombus aspiration catheter according to claim 1, characterized in that: The distal end of the intermediate tube is provided with a developing ring.

10. The thrombus aspiration catheter according to claim 1, characterized in that: The outer surface of the outer tube is coated with a lubricating coating.

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