Thrombus aspiration catheter

Abstract

The invention discloses a thrombus aspiration catheter. The thrombus aspiration catheter comprises a catheter unit, a handle and an aspiration unit which are connected in sequence, the catheter unit is of a multi-cavity structure and at least comprises a navigation cavity channel, a thrombus drawing cavity and a blood return cavity, a thrombus drawing cavity opening is formed in the catheter unit, and the thrombus drawing cavity is communicated with the thrombus drawing cavity opening; the catheter unit is of a multi-cavity structure, the handle is provided with a suction connector matched with the suction unit, the suction connector is communicated with the thrombus drawing cavity and the blood return cavity, and the suction unit can enable part of blood entering from the thrombus drawing cavity to flow back into a blood vessel from the blood return cavity. The blood loss amount of the patient is reduced; in addition, the thrombus sensing part is arranged, so that an operator can be reminded whether to accurately suck thrombus, and the operation is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a thrombus aspiration catheter. Background Art

[0002] Vascular interventional technology is a common minimally invasive treatment method that avoids surgical operation. Through femoral artery or radial artery puncture and intravascular catheter operation, the treatment device is delivered to the site of vascular lesions, which can achieve vascular recanalization in a short time. The patient has low intraoperative risk and fast postoperative recovery. The development prospects of interventional treatment are good.

[0003] The most common emergency stroke in clinical practice is cerebral thrombosis. Thrombosis is mainly caused by the rupture of atherosclerotic plaques, which block other blood vessels as blood flows. Thrombosis blocking cerebral blood vessels may cause cerebral infarction. Mild cases may cause hemiplegia, aphasia, headache, etc., and severe cases may cause coma. If the thrombus is not removed for a long time, it will cause irreversible damage to nerve cells and even lead to death. With the development of minimally invasive interventional medicine and imaging. The general treatment process for acute cerebral thrombosis is as follows: Figure 1 As shown, CT, MRI, and digital subtraction angiography (DSA) are performed before the operation to determine the location of the thrombus. The femoral or radial artery is punctured, and a vascular sheath, guidewire, and catheter are used to establish access. Then, with the assistance of the guidewire, a suction catheter is introduced to remove the thrombus using the principle of negative pressure aspiration, thereby restoring vascular canalization.

[0004] Conventional suction catheters (eg Figure 2 The single-lumen tube (as shown) generally has only one lumen, which has the following problems: 1. It requires a guidewire for guidance. After approaching the thrombus location, the guidewire is withdrawn and then suction is performed; 2. During the suction process, too much blood will be sucked out along with the thrombus, resulting in a certain amount of blood loss. Summary of the Invention

[0005] The present invention provides a thrombus aspiration catheter, which is used to solve the problem that the existing aspiration catheter will aspirate too much blood and cause excessive blood loss in patients.

[0006] A thrombus aspiration catheter comprises a catheter unit, a handle and an aspiration unit connected in sequence;

[0007] The catheter unit is a multi-lumen structure, which at least includes a navigation channel, a thrombus extraction cavity and a blood return cavity. The catheter unit is provided with a thrombus extraction cavity opening, and the thrombus extraction cavity is connected to the thrombus extraction cavity opening;

[0008] The handle has a suction interface that cooperates with the suction unit. The suction interface is connected to the embolism extraction chamber and the blood return chamber. The suction unit can allow part of the blood entering the embolism extraction chamber to flow back into the blood vessel from the blood return chamber.

[0009] Preferably, a thrombus sensing element is provided in the thrombus extraction cavity.

[0010] Preferably, a thrombus sensing display is provided on the handle.

[0011] Preferably, the thrombus sensing element is at least one sensor, and the thrombus sensing display element is an LED light, and the LED light changes color based on the change in the size of the pressure sensed by the sensor.

[0012] Preferably, the navigation cavity extends outside the catheter, and its end is curved.

[0013] Preferably, the handle is equipped with two valves for controlling the opening and closing of the embolus extraction chamber and the blood return chamber respectively.

[0014] Preferably, the suction unit is a negative pressure pump.

[0015] Preferably, the suction unit is a syringe, which includes a barrel and a pushing assembly matched with the barrel, and the pushing assembly includes a piston and a core rod connected to the piston;

[0016] The suction interface cooperates with the cylinder, and the cylinder is provided with a blocking piece. During the rotation of the cylinder, the blocking piece can switch from the blocking state of the plug-drawing chamber to the blood return chamber.

[0017] Preferably, the outer edge of the cylinder has an outer edge, and the handle is threadedly connected to a limit cap at the suction interface, and the limit cap is used to prevent the suction unit from falling off.

[0018] Preferably, the end of the core rod is connected to a notch-shaped connecting plate, and a one-way limiter is installed on the handle. When the blocking member blocks the blood return cavity, the one-way limiter is located on the bolt-pulling movement path of the connecting plate.

[0019] Compared with the prior art, the present invention has the following advantages: the present invention can push excess blood back into the blood vessels through the multi-lumen catheter unit combined with the suction unit, thereby reducing the patient's blood loss;

[0020] In addition, a thrombus sensor is also provided to remind the operator whether the thrombus is accurately sucked out, which is beneficial to the progress of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the schematic diagram of the thrombectomy principle;

[0022] Figure 2 Schematic diagram of the structure of a traditional suction catheter;

[0023] Figure 3 It is a schematic diagram of the structure of the suction catheter of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the blood return chamber and the embolus extraction chamber of the present invention;

[0025] Figure 5 It is a schematic diagram of the partial structure of the end portion of the catheter unit of the present invention;

[0026] Figure 6 is a cross-sectional view of a suction unit according to a second embodiment of the present invention;

[0027] Figure 7 This is a partial structural diagram of a one-way limiter according to a second embodiment of the present invention;

[0028] Figure 8 This is a schematic structural diagram of a connecting plate according to a second embodiment of the present invention;

[0029] Figure 9 Schematic diagram of the structure of the cylinder and the blocking member of the second embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1-catheter unit, 2-handle, 3-navigation cavity, 4-thrombus extraction cavity, 5-blood return cavity, 6-thrombus extraction cavity opening, 7-development point, 8-suction interface, 9-valve, 10-thrombus sensing element, 11-thrombus sensing display element, 12-cylinder, 13-piston, 14-core rod, 15-blocking element, 16-outer edge, 17-limiting cap, 18-connector, 19-limiting block, 20-groove, 21-reed, 22-filter, 23-connecting plate. DETAILED DESCRIPTION

[0032] A specific embodiment of the present invention is described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0033] Example 1

[0034] like Figures 3 to 5 As shown, a thrombus aspiration catheter provided by an embodiment of the present invention includes a catheter unit 1, a handle 2, and an aspiration unit connected in sequence;

[0035] The suction unit of this embodiment is a negative pressure pump or a syringe

[0036] The catheter unit 1 is a multi-lumen structure, which at least includes a navigation channel 3, a thrombus extraction cavity 4 and a blood return cavity 5. The catheter unit 1 is provided with a thrombus extraction cavity opening 6, which is connected to the thrombus extraction cavity opening 6.

[0037] The catheter unit 1 is provided with a developing point 7 near the embolus extraction cavity 6. The developing point 7 is generally made of a precious metal (such as platinum-iridium, platinum-nickel, gold, etc.) and can be developed under X-rays, making it easier for the operator to determine the position of the device in the body.

[0038] The navigation channel 3 is used for the passage of instruments such as guidewires, helping the suction catheter reach the thrombus. It extends outside the catheter and has a curved end to avoid direct scraping of the blood vessel.

[0039] The handle 2 has a suction interface 8 that cooperates with the suction unit. The suction interface 8 is connected to the embolization chamber 4 and the blood return chamber 5. The suction unit can allow part of the blood entering the embolization chamber 4 to flow back into the blood vessel through the blood return chamber 5.

[0040] Specifically, the handle 2 is provided with two valves 9 for controlling the opening and closing of the embolism extraction chamber 4 and the blood return chamber 5, respectively. In the initial state, both valves 9 are in the closed state. During suction, only the valve 9 of the embolism extraction chamber 4 is opened, and the thrombus can be sucked from the embolism extraction chamber opening 6 by the suction unit. In addition, a filter 22 is provided near the position where the embolism extraction chamber 4 is connected to the suction interface 8 to prevent the thrombus from entering the suction interface 8. After the thrombus is sucked out, the valve 9 of the embolism extraction chamber 4 is closed and the valve 9 of the blood return chamber is opened. The excess blood is pushed into the blood return chamber by the suction unit, and flows into the blood vessel from the outlet of the blood return chamber, thereby reducing blood loss.

[0041] The outlet of the reflux cavity can be opened separately on one side of the catheter unit 1 to reduce the length of the reflux cavity, thereby reducing blood loss. Of course, it can also be connected to the embolus extraction cavity 6. The specific situation can be set according to actual conditions.

[0042] Example 2

[0043] like Figures 3 to 9 As shown, based on the first embodiment, this embodiment provides a thrombus aspiration catheter. The difference from the first embodiment is that this embodiment does not need to use a valve 9 to control the opening and closing of the thrombus aspiration chamber 4 and the reflux chamber. Specifically, the aspiration unit of this embodiment is a syringe, which includes a barrel 12 and a pushing assembly matched with the barrel 12. The pushing assembly includes a piston 13 and a core rod 14 connected to the piston 13. The end of the barrel 12 has an opening to connect the interior of the barrel 12 with the aspiration interface 8, thereby completing the function of aspirating thrombus.

[0044] The suction interface 8 is matched with the barrel 12, and the barrel 12 is provided with a blocking member 15. During the rotation of the barrel 12, the blocking member 15 can block the plug-drawing chamber 4 or the blood return chamber 5, that is, the blocking member 15 can switch from blocking the plug-drawing chamber 4 to the blood return chamber 5, and vice versa. When the plug is drawn, the medical staff rotates the barrel 12 so that the blocking member 15 blocks the blood return chamber 5 (as for how to judge the position of the blocking member 15, the position of the blocking member 15 corresponding to the outer wall of the barrel 12 can be determined). Marks are set (not shown in the figure) and marks corresponding to the embolism extraction chamber 4 and the blood return chamber 5 are set on the handle 2. When the mark on the outer wall of the barrel 12 points to the blood return chamber 5, it means that the blood return chamber 5 is closed. Then, the core rod 14 is pulled outward to suck the thrombus at the embolism extraction chamber opening 6 into the embolism extraction chamber 4. After the embolism is extracted, the barrel 12 is rotated so that the blocking member 15 blocks the embolism extraction chamber 4, pushing the blood in the syringe into the blood return chamber 5, allowing the blood to flow back into the blood vessel, thereby reducing blood loss.

[0045] In order to prevent the suction unit from falling off, the outer edge 16 of the cylinder 12 has an outer edge 16, and the handle 2 is located on the suction interface 8 and is threadedly connected to a limit cap 17. The limit cap 17 does not fix the suction unit, but only plays a limiting role. The outer edge 16 and the limit cap 17 do not conflict with each other. The two fit together and do not affect the rotation of the cylinder 12 of the suction unit. The blocking member 15 can be made of rubber or other materials with a certain degree of elasticity, which will not affect its blocking effect.

[0046] The above method reduces the number of valves 9 and makes operation more convenient.

[0047] In addition, in some other embodiments, the end of the core rod 14 is connected to a circular notch-shaped connecting plate 23, and a one-way limiter is installed on the handle. When the blocking member 15 blocks the blood return cavity 5, the one-way limiter is located on the bolt withdrawal movement path of the connecting plate 23. Specifically, the one-way limiter includes a connector 18 and a plurality of limit blocks 19. The connector 18 is fixedly connected to the handle or the limit cap 17, and a plurality of grooves 20 are provided thereon. The plurality of limit blocks 19 are respectively hinged in the plurality of grooves 20. The limit blocks 19 are right-angled triangles, and a spring 21 connected to the limit blocks 19 is provided in the groove 20, as shown in FIG. Figure 7As shown, a portion of the limit block 19 is stuck in the groove 20 and cannot be moved out of the groove 20. When the one-way limit piece is located on the bolt extraction movement path of the connecting plate 23, the core shaft can only be pulled outward. During the pulling process, the connecting plate 23 abuts against the hypotenuse surface of the limit block 19, and the limit block 19 moves into the groove 20. If you want to press down to complete blood reflux, the connecting plate 23 abuts against the right-angled side of the right triangle and cannot continue to move downward. Therefore, it can prevent the doctor from mistakenly operating and re-discharging the thrombus into the blood vessel. When blood reflux is performed, the cylinder 12 is rotated to a certain angle (which can be 180 degrees, depending on the angle between the thrombus extraction chamber 4 and the blood return chamber 5). At this time, the notch of the circular connecting plate 23 is facing the one-way limit piece, which will not affect the pushing of the core rod 14, thereby smoothly performing blood reflux.

[0048] Example 3

[0049] This embodiment provides a thrombus aspiration catheter based on the first or second embodiment, wherein a thrombus aspiration cavity 6 is provided with a thrombus sensing element 10, and a thrombus sensing display element 11 is provided on the handle 2;

[0050] The thrombus sensing element 10 of this embodiment is at least one sensor, and the thrombus sensing display element 11 is an LED light, which changes color based on the pressure sensed by the sensor.

[0051] Specifically, the sensor is a highly sensitive sensing element that can detect different pressures (such as blood, blood vessel walls, thrombus, etc.), use the piezoelectric effect to obtain information, convert the sensed signal into an electrical signal, output voltage, and then amplify and filter it through the circuit to output a standardized signal. The LED light on the handle 2 displays different colors to inform the operator of the detected substance and assist in determining whether the thrombus is accurately sucked out.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A thrombus aspiration catheter, characterized in that: It includes a catheter unit, a handle, and a suction unit connected in sequence; The catheter unit is a multi-lumen structure, which at least includes a navigation channel, a thrombus extraction cavity and a blood return cavity. The catheter unit is provided with a thrombus extraction cavity opening, and the thrombus extraction cavity is connected to the thrombus extraction cavity opening; The handle has a suction interface that cooperates with the suction unit. The suction interface is connected to the embolism extraction chamber and the blood return chamber. The suction unit can allow part of the blood entering the embolism extraction chamber to flow back into the blood vessel from the blood return chamber.

2. The thrombus aspiration catheter according to claim 1, characterized in that: A thrombus sensing component is provided in the thrombus extraction cavity.

3. The thrombus aspiration catheter according to claim 2, characterized in that: The handle is provided with a thrombus sensing display component.

4. A thrombus aspiration catheter according to claim 3, characterized in that: The thrombus sensing component is at least one sensor, and the thrombus sensing display component is an LED light. The LED light changes color based on the change in the size of the pressure sensed by the sensor.

5. The thrombus aspiration catheter according to claim 1, characterized in that: The navigation cavity extends outside the catheter, and the end portion thereof is curved.

6. The thrombus aspiration catheter according to claim 1, characterized in that: The handle is equipped with two valves for controlling the on / off of the embolus extraction chamber and the blood return chamber respectively.

7. The thrombus aspiration catheter according to claim 1, characterized in that: The suction unit is a negative pressure pump.

8. The thrombus aspiration catheter according to claim 1, characterized in that: The suction unit is a syringe, which includes a barrel and a pushing assembly matched with the barrel, and the pushing assembly includes a piston and a core rod connected to the piston; The suction interface cooperates with the cylinder, and the cylinder is provided with a blocking piece. During the rotation of the cylinder, the blocking piece can switch from the blocking state of the plug-drawing chamber to the blood return chamber.

9. The thrombus aspiration catheter according to claim 8, characterized in that: The outer edge of the cylinder has an outer edge, and the handle is threadedly connected to a limit cap at the suction interface, and the limit cap is used to prevent the suction unit from falling off.

10. The thrombus aspiration catheter according to claim 8, characterized in that: The end of the core rod is connected to a circular segment-shaped connecting plate, and a one-way limiting piece is installed on the handle. When the blocking piece blocks the blood return cavity, the one-way limiting piece is located on the bolt-pulling movement path of the connecting plate.

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