Thrombus aspiration catheter

Abstract

The application discloses a thrombus suction catheter, which comprises a catheter unit, a handle and a suction unit connected in sequence; the catheter unit is a multi-cavity structure, and at least comprises a navigation cavity, a suction cavity and a blood return cavity; the catheter unit is provided with a suction cavity opening; the suction cavity is communicated with the suction cavity opening; the handle is provided with a suction interface matched with the suction unit; the suction interface is communicated with the suction cavity and the blood return cavity; the suction unit can return part of blood entering from the suction cavity to the blood vessel through the blood return cavity; the multi-cavity structure of the catheter unit cooperated with the suction unit can push the excess blood back to the blood vessel, so that the blood loss of the patient is reduced; in addition, the thrombus sensing part is arranged, which can remind the operator whether the thrombus is accurately sucked, and is beneficial to the operation.

Description

Technical Field

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

[0002] Interventional vascular technology is a common minimally invasive treatment that avoids open surgery. By puncturing the femoral or radial artery and using an intravascular catheter, treatment devices are delivered to the lesion site. This can achieve vascular recanalization in a short time. Patients experience low intraoperative risk and rapid postoperative recovery, and interventional therapy has a promising future.

[0003] In clinical practice, the most common type of emergency stroke is cerebral thrombosis. Thrombosis mainly occurs when atherosclerotic plaques rupture and, as the blood flows, block other blood vessels. A thrombus blocking a cerebral blood vessel can lead to cerebral infarction. Mild cases may present with hemiplegia, aphasia, and headache, while severe cases can result in coma. If the thrombus is not removed for a prolonged period, it can cause irreversible damage to nerve cells and even death. With the development of minimally invasive interventional techniques 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 artery or radial artery is punctured, and a passage is established through a vascular sheath, guidewire and catheter. Then, with the assistance of the guidewire, the aspiration catheter is followed, and the thrombus is removed by using the principle of negative pressure aspiration, thereby restoring blood flow.

[0004] Traditional aspiration catheters (such as) Figure 2 As shown, it is generally a single-lumen tube, that is, there is only one lumen, which has the following problems: 1. It requires guide wire guidance. After approaching the thrombus, the guide wire is withdrawn and then aspiration is performed; 2. During the aspiration process, too much blood will be aspirated along with the thrombus, resulting in a certain amount of blood loss. Summary of the Invention

[0005] This invention provides a thrombus aspiration catheter to solve the problem that existing aspiration catheters will aspirate too much blood, resulting in excessive blood loss for the patient.

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

[0007] The catheter unit is a multi-lumen structure, which includes at least a navigation cavity, a thrombectomy cavity, and a blood return cavity. The catheter unit has a thrombectomy cavity port, and the thrombectomy cavity is connected to the thrombectomy cavity port.

[0008] The handle has an aspiration port that mates with the aspiration unit. The aspiration port is connected to the thrombectomy chamber and the blood return chamber. The aspiration unit allows some of the blood that enters from the thrombectomy chamber to flow back into the blood vessel through the blood return chamber.

[0009] Preferably, a thrombus sensing element is provided inside the thrombus removal cavity.

[0010] Preferably, the handle is provided with a thrombosis detection display.

[0011] Preferably, the thrombosis sensing element is at least one sensor, and the thrombosis sensing display element is an LED light, which changes color based on the pressure changes 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 embolization 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 that cooperates with the barrel. The pushing assembly includes a piston and a core rod connected to the piston.

[0016] The suction port is fitted with the cylinder, which has a sealing element. During the rotation of the cylinder, the sealing element can switch from blocking the thrombus suction chamber to blocking the blood return chamber.

[0017] Preferably, the outer edge of the cylinder has an outer edge, and a limit cap is threadedly connected to the handle at the suction interface. 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 segmental connecting plate, and a one-way limiting member is installed on the handle. When the sealing member blocks the blood return cavity, the one-way limiting member is located on the thrombectomy movement path of the connecting plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention can push excess blood back into the blood vessels by using a multi-lumen catheter unit in conjunction with a suction unit, thereby reducing the amount of blood loss for the patient;

[0020] In addition, a thrombus detection device is installed, which can remind the surgeon whether the thrombus has been accurately aspirated, which is beneficial to the operation. Attached Figure Description

[0021] Figure 1 Diagram of thrombectomy principle;

[0022] Figure 2 This is a schematic diagram of a traditional suction catheter structure;

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

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

[0025] Figure 5 This is a partial structural diagram of the end of the catheter unit of the present invention;

[0026] Figure 6 This is a cross-sectional view of the suction unit according to Embodiment 2 of the present invention;

[0027] Figure 7 This is a partial structural schematic diagram of the unidirectional limiting member according to Embodiment 2 of the present invention;

[0028] Figure 8 This is a schematic diagram of the connecting plate in Embodiment 2 of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of the cylinder and sealing component in Embodiment 2 of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Catheter unit, 2-Handle, 3-Navigation channel, 4-Thrombectomy chamber, 5-Return blood chamber, 6-Thrombectomy chamber port, 7-Illumination point, 8-Aspiration interface, 9-Valve, 10-Thrombectomy sensor, 11-Thrombectomy display, 12-Cylinder, 13-Piston, 14-Core rod, 15-Occlusion element, 16-Outer edge, 17-Limiting cap, 18-Connector, 19-Limiting block, 20-Groove, 21-Spring, 22-Filter screen, 23-Connecting plate. Detailed Implementation

[0032] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0033] Example 1

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

[0035] In this embodiment, the suction unit is a negative pressure pump or a syringe.

[0036] The catheter unit 1 is a multi-lumen structure, which includes at least a navigation cavity 3, a thrombectomy cavity 4 and a blood return cavity 5. The catheter unit 1 has a thrombectomy cavity port 6, and the thrombectomy cavity 4 is connected to the thrombectomy cavity port 6.

[0037] The catheter unit 1 has a contrast point 7 installed near the thrombectomy port 6. The contrast point 7 is usually made of precious metal (such as platinum-iridium, platinum-nickel, gold, etc.) which can be visualized under X-rays, making it easier for the operator to determine the position of the instrument in the body.

[0038] Navigation channel 3 is used for the passage of instruments such as guidewires, and helps the aspiration catheter reach the thrombus. It extends outside the catheter and its end is curved to avoid direct rubbing against the blood vessel.

[0039] The handle 2 has an aspiration port 8 that mates with the aspiration unit. The aspiration port 8 is connected to the thrombectomy chamber 4 and the blood return chamber 5. The aspiration unit allows some of the blood that enters from the thrombectomy chamber 4 to flow back into the blood vessel from the blood return chamber 5.

[0040] Specifically, the handle 2 is equipped with two valves 9 for controlling the opening and closing of the thrombectomy chamber 4 and the blood return chamber 5, respectively. Initially, both valves 9 are closed. During aspiration, only the valve 9 of the thrombectomy chamber 4 is opened, and the thrombus can be drawn from the thrombectomy chamber opening 6 through the aspiration unit. In addition, a filter screen 22 is provided near the connection between the thrombectomy chamber 4 and the aspiration interface 8 to prevent the thrombus from entering the aspiration interface 8. After the thrombus is aspirated, the valve 9 of the thrombectomy chamber 4 is closed and the valve 9 of the blood return chamber is opened. The aspiration unit pushes the excess blood into the blood return chamber and it flows into the blood vessel from the outlet of the blood return chamber, reducing blood loss.

[0041] The outlet of the reflux chamber can be opened on one side of the catheter unit 1 to reduce the length of the reflux chamber and thus reduce blood loss. Of course, it can also be connected to the embolization port 6. The specific configuration can be set according to the actual situation.

[0042] Example 2

[0043] like Figures 3 to 9 As shown, based on Embodiment 1, this embodiment proposes a thrombus aspiration catheter. The difference from Embodiment 1 is that this embodiment does not require valve 9 to control the opening and closing of the thrombus aspiration chamber 4 and the return chamber. Specifically, the aspiration unit of this embodiment is a syringe, which includes a barrel 12 and a push assembly that cooperates with the barrel 12. The push assembly includes a piston 13 and a core rod 14 connected to the piston 13. The end of the barrel 12 has an opening so that the inside of the barrel 12 communicates with the aspiration interface 8, thereby enabling the function of aspirating thrombi.

[0044] The suction port 8 cooperates with the cylinder 12, which has a sealing element 15. During rotation of the cylinder 12, the sealing element 15 can block the thrombectomy chamber 4 or the blood return chamber 5. That is, the sealing element 15 can switch from blocking the thrombectomy chamber 4 to blocking the blood return chamber 5, and vice versa. Therefore, during thrombectomy, medical personnel rotate the cylinder 12 to block the blood return chamber 5 with the sealing element 15. (As for how to determine the position of the sealing element 15, it can be determined by looking at the corresponding position on the outer wall of the cylinder 12.) Set markings (not shown in the figure) and set corresponding markings for the thrombus aspiration chamber 4 and the blood return chamber 5 on the handle 2. When the marking on the outer wall of the cylinder 12 points to the blood return chamber 5, it means that the blood return chamber 5 is closed. Then pull the core rod 14 outward to draw the thrombus located at the thrombus aspiration chamber 6 into the thrombus aspiration chamber 4. After completing the thrombus aspiration, rotate the cylinder 12 to block the thrombus aspiration chamber 4 with the sealing member 15, push the blood in the syringe into the blood return chamber 5, and let the blood flow back into the blood vessel to reduce blood loss.

[0045] To prevent the suction unit from falling off, the outer edge 16 of the cylinder 12 has an outer edge 16. A limit cap 17 is threadedly connected to the handle 2 at the suction interface 8. The limit cap 17 does not fix the suction unit, but only serves to limit it. The outer edge 16 and the limit cap 17 do not collide. They fit together without affecting the rotation of the cylinder 12 of the suction unit. The sealing part 15 can be made of rubber or other materials, which have a certain elasticity and will not affect its sealing effect.

[0046] The above method reduces the number of valves 9, making operation more convenient;

[0047] In other embodiments, the end of the core rod 14 is connected to a segmental connecting plate 23, and a one-way limiting member is installed on the handle. When the sealing member 15 blocks the blood return cavity 5, the one-way limiting member is located on the thrombectomy movement path of the connecting plate 23. Specifically, the one-way limiting member includes a connecting body 18 and multiple limiting blocks 19. The connecting body 18 is fixedly connected to the handle or limiting cap 17, and has multiple grooves 20. The multiple limiting blocks 19 are respectively hinged in the multiple grooves 20. The limiting blocks 19 are right-angled triangles, and spring pieces 21 connected to the limiting blocks 19 are provided in the grooves 20. Figure 7As shown, part of the limiting block 19 is stuck in the groove 20 and cannot be moved out of the groove 20. When the one-way limiting member is on the thrombectomy path of the connecting plate 23, the spindle can only be pulled outward. During the pulling process, the connecting plate 23 abuts against the inclined surface of the limiting block 19, and the limiting block 19 moves into the groove 20. If you want to press down to complete the blood return, the connecting plate 23 abuts against the right angle side of the right triangle and cannot continue to move downward. Therefore, it can prevent doctors from accidentally discharging the thrombus back into the blood vessel. When performing blood return, the cylinder 12 is rotated at a certain angle (it can be 180 degrees, depending on the angle between the thrombectomy chamber 4 and the blood return chamber 5). At this time, the notch of the cleft-and-semicircular connecting plate 23 is facing the one-way limiting member, so it will not affect the pushing of the spindle 14, thus allowing the blood return to proceed smoothly.

[0048] Example 3

[0049] Based on Embodiment 1 or Embodiment 2, this embodiment proposes a thrombus aspiration catheter, in which a thrombus sensing element 10 is provided in the thrombus aspiration port 6 and a thrombus sensing display element 11 is provided on the handle 2.

[0050] In this embodiment, the thrombosis sensing element 10 is at least one sensor, and the thrombosis sensing display element 11 is an LED light. The LED light changes color based on the change in 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, thrombi, etc.). It uses the piezoelectric effect to acquire information, converts the sensed signal into an electrical signal, outputs a voltage, and then amplifies and filters it through a circuit to output a standardized signal. The LED light on the handle 2 displays different colors to inform the operator of the substance being detected and to help determine whether the thrombus has been accurately aspirated.

[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 implemented in other specific forms without departing from its spirit and essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments 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 includes at least a navigation cavity, a thrombectomy cavity, and a blood return cavity. The catheter unit has a thrombectomy cavity port, and the thrombectomy cavity is connected to the thrombectomy cavity port. The thrombectomy chamber and the blood return chamber are independent cavities; The handle has an aspiration port that mates with the aspiration unit. The aspiration port is connected to the thrombectomy chamber and the blood return chamber. The aspiration unit allows a portion of the blood that enters from the thrombectomy chamber to flow back into the blood vessel from the blood return chamber. The suction unit is a syringe, which includes a barrel and a pushing assembly that cooperates with the barrel. The pushing assembly includes a piston and a core rod connected to the piston. The suction port is fitted with the cylinder, which has a sealing element. During the rotation of the cylinder, the sealing element can switch from blocking the thrombus suction chamber to blocking the blood return chamber.

2. The thrombus aspiration catheter as described in claim 1, characterized in that, A thrombus sensing element is installed inside the thrombus removal cavity.

3. The thrombus aspiration catheter as described in claim 2, characterized in that, The handle is equipped with a thrombosis detection display.

4. A thrombus aspiration catheter as described in claim 3, characterized in that, The thrombosis sensing element is at least one sensor, and the thrombosis sensing display element is an LED light, which changes color based on the change in pressure sensed by the sensor.

5. A thrombus aspiration catheter as described in claim 1, characterized in that, The navigation cavity extends outside the catheter, and its end is curved.

6. The thrombus aspiration catheter as described in claim 1, characterized in that, The handle is equipped with two valves for controlling the opening and closing of the embolization chamber and the blood return chamber, respectively.

7. A thrombus aspiration catheter as described in claim 1, characterized in that, The suction unit is a negative pressure pump.

8. A thrombus aspiration catheter as described in claim 1, characterized in that, The cylinder has an outer edge, and a limit cap is threadedly connected to the handle at the suction interface. The limit cap is used to prevent the suction unit from falling off.

9. A thrombus aspiration catheter as described in claim 1, characterized in that, The end of the core rod is connected to a segmental connecting plate, and a one-way limiting component is installed on the handle. When the sealing component blocks the blood return cavity, the one-way limiting component is located on the thrombectomy movement path of the connecting plate.

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