Thrombus aspiration control method and thrombus aspiration device

Abstract

The application discloses a kind of thrombus suction control method and thrombus suction device, and thrombus suction device includes suction assembly, suction assembly includes the shell with pressure cavity, piston rod and suction catheter, thrombus suction device also includes the motor of piston rod movement and the controller connected with motor, control method is: suction catheter is positioned to the blood vessel without thrombus, make motor operate according to speed V0, calibrate the pressure value B in pressure cavity under normal blood condition;Suction catheter is positioned to the blood vessel with thrombus, make motor operate according to speed V1, V1≤V0, make dynamic pressure value A0 in pressure cavity: when A0≤B, make motor keep speed V1 operation;When A0>B, make motor increase from speed V1: when B<A0≤C, make motor increase to speed V2 operation;When C<A0≤D, make motor increase to speed V3 operation;When D<A0≤E, make motor increase to speed V4 operation.The control method thrombus removal efficiency is high, and blood loss can be reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a thrombus aspiration control method and a thrombus aspiration device. Background Technology

[0002] Thrombus aspiration devices are key instruments for performing interventional thrombectomy. Existing thrombus aspiration devices reported in the art fall into two categories: Electric aspiration devices and Manual aspiration devices. Electric devices have several drawbacks. Firstly, they are bulky, requiring significant hospital investment and resulting in high treatment costs. Secondly, their operation is complex, requiring the surgeon to simultaneously manage both the machine and the patient, making coordination difficult. Thirdly, the negative pressure during aspiration requires manual adjustment, which is problematic due to the inability to precisely control the negative pressure. Lowering the pressure too much may result in insufficient thrombus removal or a slow aspiration rate, leading to poor thrombus removal and a longer procedure. Lowering it too much can cause over-absorption, resulting in excessive blood loss for the patient. Manual adjustment is also cumbersome, requiring constant monitoring of the negative pressure gauge. Manual aspiration devices, on the other hand, have a simpler structure and offer better control over the thrombus removal process. However, they suffer from lower aspiration efficiency, a higher risk of blockage, and are physically demanding for the surgeon. For the patient, the treatment time is longer, increasing surgical discomfort. Summary of the Invention

[0003] The purpose of this invention is to provide a novel thrombus aspiration control method that addresses the problems in the prior art by achieving high thrombus removal efficiency and reducing blood loss during surgery.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for controlling thrombus aspiration involves aspirating thrombi using a thrombus aspiration device. The device includes an aspiration assembly comprising a housing with a pressure chamber, a piston rod slidably reciprocating at one end of the pressure chamber, and an aspiration conduit with one end communicating with the pressure chamber. The device further includes a motor for driving the piston rod to reciprocate and a controller disposed within the housing. The motor is electrically connected to the controller. The control method for aspirating thrombi using the thrombus aspiration device includes the following steps:

[0006] S1, Position the aspiration catheter to a blood vessel without thrombus, and the controller controls the motor to run at speed V0, calibrating the pressure value B in the pressure chamber under normal blood conditions;

[0007] S2, the aspiration catheter is positioned at the blood vessel with thrombus, and the controller controls the motor to operate at a speed V1, where V1 ≤ V0, so that a dynamic pressure value A0 is formed in the pressure chamber:

[0008] (1) When ≤ At that time, the controller controls the motor to maintain a speed V1.

[0009] (2) When > At that time, the controller controls the motor to increase from speed V1:

[0010] when < ≤ At that time, the controller controls the motor to increase from speed V1 to speed V2 and maintain the motor running at speed V2;

[0011] when < ≤ At that time, the controller controls the motor to increase from speed V2 to speed V3 and maintain the motor at speed V3.

[0012] when < ≤ At that time, the controller controls the motor to increase from speed V3 to speed V4 and maintain the motor at speed V4.

[0013] Preferably, during the operation of the motor at a constant speed V2 The value decreased to ≤ At that time, the motor decreases from speed V2 to speed V1; while the motor maintains speed V3 during operation... The value decreased to < ≤ At that time, the motor reduces its speed from V3 to V2. The value continued to decrease to ≤ The motor decreases from speed V2 to speed V1; while the motor maintains speed V4... The value continued to decrease to ≤ At that time, the motor speed decreases from V4 to V1.

[0014] Preferably, a pressure sensor is provided on the housing to detect the pressure value in the pressure chamber, and the pressure sensor is electrically connected to the controller so that the pressure sensor sends a signal to the controller.

[0015] Preferably, B is the average pressure value in the pressure chamber when the motor operates at speed V0 to extract 10~15ml of normal blood.

[0016] Preferably, a calibration button is provided on the housing, and the calibration button is electrically connected to the controller. When the calibration button is pressed, the controller controls the motor to run at a speed V0.

[0017] The present invention also provides a novel thrombus aspiration device that not only precisely controls thrombus removal but also achieves high removal efficiency and good removal effect. The device includes an aspiration assembly comprising a housing with a pressure chamber, a piston rod reciprocally sliding at one end of the pressure chamber, an inlet pipe and an outlet pipe respectively communicating with the pressure chamber, a one-way valve respectively disposed on the inlet pipe and the outlet pipe, and an aspiration conduit communicating with the inlet pipe. The thrombus aspiration device further includes a controller and a manual drive device and an electric drive device for driving the piston rod to slide relative to the housing. Both the manual drive device and the electric drive device can cooperate with or connect to the piston rod. The thrombus aspiration device has a manual aspiration mode and an electric aspiration mode.

[0018] When the thrombus aspiration device is in electric aspiration mode, the manual drive device is engaged or connected to the piston rod at the first position of the piston rod, the electric drive device is engaged or connected to the piston rod, the electric drive device includes a motor that drives the piston rod to reciprocate, the motor is electrically connected to the controller, and the thrombus aspiration device operates according to the control method of any one of claims 1 to 5.

[0019] When the thrombus aspiration device is in manual aspiration mode, the engagement or connection between the manual drive device and the piston rod is located at the second position of the piston rod, and the engagement or connection between the electric drive device and the piston rod is disengaged.

[0020] The connection between the first position and the second position allows the engagement or connection between the manual drive device and the piston rod to switch between the first position and the second position.

[0021] Preferably, the manual drive device includes a handle rotatably mounted on the housing and a drive rod with one end rotatably connected to the handle. The other end of the drive rod is rotatably connected to the piston rod via a pivot. When the pivot is in a first position of the piston rod, the pivot can also be slidably mounted relative to the piston rod. When the pivot is in a second position of the piston rod, the pivot cannot slide relative to the piston rod.

[0022] Furthermore, the piston rod is provided with a sliding groove and a retaining groove, both of which are matched with the rotating shaft. The sliding groove extends along the sliding direction of the piston rod and is connected to the retaining groove. When the rotating shaft is located at the first position of the piston rod, the rotating shaft is located in the sliding groove and can be slidably arranged along the length extension direction of the sliding groove. When the rotating shaft is located at the second position of the piston rod, the rotating shaft is engaged in the retaining groove.

[0023] Furthermore, the electric drive device includes a first switch disposed within the housing for controlling the start and stop of the electric drive device. When the rotating shaft is at the first position of the piston rod, rotating the handle relative to the housing can drive the drive rod to abut against the first switch, thereby closing and opening the first switch. In electric aspiration mode, the first switch can be closed or opened by operating the handle. This allows the first switch to be disposed inside the housing, preventing accidental operation and improving safety. Moreover, the first switch can be closed or opened by operating the handle, eliminating the need for additional components and simplifying the structure of the thrombus aspiration device.

[0024] Furthermore, the thrombus aspiration device also includes a drive assembly for driving the rotating shaft to switch from a first position to a second position. The drive assembly includes a button rotatably disposed on the housing and a limiting rod that directly or indirectly cooperates with the button. The limiting rod is slidably disposed on the housing and abuts against the rotating shaft.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] When the degree of thrombus blockage in a blood vessel varies, the pressure in the pressure chamber also varies. The thrombus aspiration control method of this invention detects the pressure in the pressure chamber in real time during thrombus aspiration and then automatically adjusts the speed of the motor through the controller, thereby automatically adjusting the movement speed of the piston rod. This not only enables the rapid removal of thrombi and shortens the surgical process, but also reduces the amount of blood loss in the patient during the operation and greatly reduces the workload of the doctor during the operation.

[0027] Furthermore, the thrombus aspiration device of this invention, through its ingenious structural design, can simultaneously achieve manual and electric dual aspiration modes within a single housing, and the switching between these modes is convenient. This allows doctors to choose one or a combination of modes based on the actual patient's condition, maximizing both the effectiveness and efficiency of thrombus removal. For example, for patients with severe thrombi, the electric aspiration mode can be selected first. In this mode, the motor speed can be automatically adjusted according to the degree of thrombus blockage, quickly removing the thrombus, shortening the surgical process, while avoiding excessive blood loss during electric aspiration, and significantly reducing the workload of the doctor during the procedure. After most of the thrombus has been removed, the device can switch to manual aspiration mode. In this mode, the doctor can specifically control the location and progress of thrombus aspiration by intuitively sensing changes in aspiration pressure, ensuring complete thrombus removal while avoiding excessive manipulation and reducing patient blood loss. Attached Figure Description

[0028] Figure 1 This is a front view schematic diagram of the thrombus aspiration device in this embodiment;

[0029] Figure 2 This is one of the three-dimensional schematic diagrams of the thrombus aspiration device in this embodiment (with the aspiration catheter, aspiration guidewire and dilator removed).

[0030] Figure 3 This is a second perspective view of the thrombus aspiration device in this embodiment (with the aspiration catheter, aspiration guide wire and dilator removed).

[0031] Figure 4 This is a front view of the internal structure of the thrombus aspiration device in the electric aspiration mode of this embodiment (with the aspiration catheter, aspiration guidewire and dilator removed).

[0032] Figure 5 This is a side view of the internal structure of the thrombus aspiration device in the electric aspiration mode of this embodiment (with the aspiration catheter, aspiration guidewire and dilator removed).

[0033] Figure 6 for Figure 5 Enlarged view of a portion of point A in the middle;

[0034] Figure 7 This is one of the cross-sectional schematic diagrams of the thrombus aspiration device in the electric aspiration mode of this embodiment (with the aspiration catheter, aspiration guide wire and dilator removed).

[0035] Figure 8 This is the second cross-sectional view of the thrombus aspiration device in the electric aspiration mode of this embodiment (with the aspiration catheter, aspiration guide wire and dilator removed).

[0036] Figure 9 for Figure 8Enlarged view of a portion of point A in the middle;

[0037] Figure 10 This is the third cross-sectional view of the thrombus aspiration device in the electric aspiration mode of this embodiment (with the aspiration catheter, aspiration guide wire and dilator removed).

[0038] Figure 11 This is a front view of the internal structure of the thrombus aspiration device in manual aspiration mode in this embodiment (with the aspiration catheter, aspiration guidewire, and dilator removed).

[0039] Figure 12 This is a side view of the internal structure of the thrombus aspiration device in manual aspiration mode in this embodiment (with the aspiration catheter, aspiration guidewire, and dilator removed).

[0040] Figure 13 for Figure 12 Enlarged view of a portion of point A in the middle;

[0041] Figure 14 This is one of the three-dimensional schematic diagrams of a portion of the structure of the thrombus aspiration device in manual aspiration mode according to this embodiment;

[0042] Figure 15 This is the second perspective view of a portion of the structure of the thrombus aspiration device in manual aspiration mode according to this embodiment;

[0043] Figure 16 This is a control principle diagram of the thrombus aspiration device in this embodiment.

[0044] The components are as follows: 11. Housing; 12. Piston rod; 121. Piston; 122. Rod body; 122a. Slide groove; 122b. Slot; 131. Inlet pipe; 132. Outlet pipe; 133. One-way valve; 14. First elastic element; 151. Suction conduit; 152. Suction guide wire; 153. Expander; 21. Handle; 22. Drive rod; 23. Second elastic element; 31. Motor; 32. Gear; 33. Rack; 34. First switch; 35. Second switch; 4. Rotating shaft; 51. Button; 52. Limit rod; 53. Third elastic element; 54. Fourth elastic element; 6. Controller; 7. Pressure sensor; 8. Calibration button. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, such as... Figure 1 In the figures, the left direction is "front," the right direction is "rear," the top direction is "up," and the bottom direction is "down." The directions perpendicular to the paper are "left" and "right." This is merely for ease of description and simplification of the invention, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] As shown in Figure 1~ Figure 15 As shown, the thrombus aspiration device of the present invention includes an aspiration assembly, an electric drive device, and a manual drive device.

[0048] The suction assembly includes a housing 11, which has a pressure chamber A. The suction assembly also includes a piston rod 12, which is located at one end of the pressure chamber A and is reciprocally slidably disposed within the housing 11.

[0049] like Figure 7 , Figure 10 and Figure 11 As shown, the piston rod 12 includes a piston 121 and a rod body 122. The piston 121 is located at one end of the pressure chamber A. The piston 121 is slidably connected to the inner wall of the housing 11. One end of the rod body 122 is fixedly mounted on the piston 121.

[0050] The suction assembly also includes an inlet pipe 131 and an outlet pipe 132. For example... Figure 7 , Figure 10 and Figure 11 As shown, the inlet pipe 131 is located in front of the pressure chamber A and is connected to the front part of the pressure chamber A. The outlet pipe 31 is located behind the pressure chamber A and is connected to the rear part of the pressure chamber A.

[0051] The aspiration assembly also includes one-way valves 133 respectively installed on the inlet pipe 131 and the outlet pipe 132, thereby forming a passage that allows the thrombus to flow only in one direction from the inlet pipe 131 to the pressure chamber A to the outlet pipe 132.

[0052] The suction assembly also includes a first elastic element 14, the elastic force of which drives the piston rod 12 to slide back relative to the housing 11. In this embodiment, the elastic force of the first elastic element 14 drives the piston rod 12 to slide forward relative to the housing 11. One end of the first elastic element 14 is disposed on the piston 121, and the other end of the first elastic element 14 is disposed on the housing 11, as shown below. Figure 7 , Figure 10 and Figure 11 As shown.

[0053] like Figure 1 As shown, the aspiration assembly also includes an aspiration catheter 151, an aspiration guidewire 152, and a dilator 153. One end of the aspiration catheter 151 is connected to the inlet tube 131, and the other end of the aspiration catheter 151 can extend into the blood vessel and reach the thrombus location. The aspiration guidewire 152 is detachably disposed within the aspiration catheter 151, and both ends of which can extend out from the aspiration catheter 151. The aspiration guidewire 152 is used to guide the aspiration catheter 151 into the blood vessel and along the blood vessel to the thrombus location. The dilator 153 is detachably disposed at the other end of the aspiration catheter 151. The dilator 153 constricts the aspiration catheter 151 when the other end of the aspiration catheter 151 enters the blood vessel, thereby preventing damage to the blood vessel wall when the other end of the aspiration catheter 151 enters the blood vessel.

[0054] When the piston rod 12 slides back and forth relative to the housing 11, a negative pressure is generated in the pressure chamber A. Under the action of the negative pressure, the thrombus in the blood vessel is drawn through the suction catheter 151 into the inlet pipe 131, and flows out through the pressure chamber A from the outlet pipe 132. Figure 10 As shown.

[0055] The manual drive device is engaged or connected with the piston rod 12. By operating the manual drive device, the piston rod 12 can be driven to slide relative to the housing 11, and the piston rod 12 can be reset by sliding in the opposite direction through the first elastic element 14. This repeated operation causes the piston rod 12 to slide back and forth relative to the housing 11, generating negative pressure in the pressure chamber A of the housing 11, thereby aspirating the thrombus in the blood vessel and putting the thrombus aspiration device into manual aspiration mode.

[0056] Specifically, such as Figure 11 As shown, the manual drive device includes a handle 21 and a drive rod 22. The handle 21 is rotatably mounted on the housing 11, one end of the drive rod 22 is rotatably connected to the handle 21, and the other end of the drive rod 22 is rotatably connected to the piston rod 12 via a rotating shaft 4.

[0057] When the operating handle 21 is rotated relative to the housing 11, the piston rod 12 is driven to slide backward relative to the housing 11 via the drive rod 22. When the handle 21 is released, the piston rod 12 slides forward under the elastic force of the first elastic element 14. This achieves the reciprocating sliding of the piston rod 12.

[0058] The manual drive device also includes a second elastic element 23, one end of which is disposed on the handle 21 and the other end of which is disposed on the housing 11. When the handle 21 is released, the elastic force of the second elastic element 23 is used to drive the handle 21 to rotate in the opposite direction relative to the housing 11 to reset.

[0059] The electric drive device is engaged or connected with the piston rod 12. The electric drive device can drive the piston rod 12 to slide back and forth relative to the housing 11, so as to generate negative pressure in the pressure chamber A of the housing 11, thereby aspirating the thrombus in the blood vessel and putting the thrombus aspiration device into electric aspiration mode.

[0060] Specifically, such as Figure 4 , Figure 7 and Figure 10 As shown, the electric drive device includes a motor 31, a gear 32, and a rack 33. The motor 31 is housed within the housing 11, the gear 32 is mounted on the motor shaft of the motor 31, and the rack 33 is mounted on the piston rod 12. The gear 32 can mesh with the rack 33. When the motor 31 starts, the motor shaft rotates, driving the gear 32 to rotate. When the gear 32 meshes with the rack 33, it drives the rack 33 to slide relative to the housing 11, thereby causing the piston rod 12 to slide synchronously relative to the housing 11. The reciprocating sliding of the piston rod 12 can be achieved by rotating the motor 31 in both directions.

[0061] The electric drive device also includes a first switch 34 and a second switch 35, both of which are housed within the housing 11. Both switches 34 and 35 have closed and open states. The motor 31 can only be energized and started when both switches 34 and 35 are closed, thus putting the thrombus aspiration device into electric aspiration mode to aspirate thrombi from blood vessels. This improves the safety performance of the thrombus aspiration device and prevents it from being switched to electric aspiration mode due to misoperation.

[0062] In the initial state, the second switch 35 of the thrombus aspiration device is closed and the first switch 34 is open. When the electric drive device is started, the first switch 34 needs to be pressed to power on and start the motor 31.

[0063] In this embodiment, as Figure 4As shown, the drive rod 22 is arc-shaped. When the drive rod 22 is rotated relative to the piston rod 12 and slid backward by the operating handle 21, the first switch 34 is located in the sliding direction of the drive rod 22, and the arc-shaped protrusion of the drive rod 22 faces the first switch 34, allowing the drive rod 22 to touch the first switch 34, thus changing the first switch 34 from the open state to the closed state. To open the first switch 34 from the closed state, the operating handle 21 is also required, causing the drive rod 22 to touch the first switch 34.

[0064] like Figures 4-10 As shown, when the thrombus aspiration device is in electric aspiration mode:

[0065] The electric drive unit is engaged or connected to the piston rod 12, that is, the gear 32 and the rack 33 are in a meshing state.

[0066] The manual drive device engages with or connects to the piston rod 12 at the first position where the rotating shaft 4 is on the piston rod 12. At this point, the rotating shaft 4 can also slide relative to the piston rod 12. Thus, when the piston rod 12 is driven to reciprocate via the electric drive device, the handle 21 and drive rod 22 remain stationary, while the piston rod 12 can slide relative to the rotating shaft 4, ensuring that the manual drive device does not affect the reciprocating sliding of the piston rod 12. When the handle 21 is operated, the piston rod 12 remains stationary, and the drive rod 22 drives the rotating shaft 4 to slide relative to the piston rod 12. In other words, the piston rod 12 only reciprocates relative to the housing 11 under the drive of the electric drive device.

[0067] In this embodiment, the piston rod 12 has a groove 122a extending along its sliding direction on its rod body 122, and the groove 122a matches the rotating shaft 4. When the rotating shaft 4 is in the first position on the piston rod 12, the rotating shaft 4 is located in the groove 122a and can be slidably arranged along the length extension direction of the groove 122a.

[0068] like Figures 11-15 As shown, when the thrombus aspiration device is in manual aspiration mode:

[0069] Both the first switch 34 and the second switch 35 are in the off state, disengaging the electric drive device from the piston rod 12, i.e., disengaging the gear 32 from the rack 33. The manual drive device is in the second position on the piston rod 12 at the point where the rotating shaft 4 is engaged or connected to the piston rod 12, and at this time, the rotating shaft 4 cannot slide relative to the piston rod 12. Thus, when the handle 21 is operated, the handle 21 rotates relative to the housing 11, causing the drive rod 22 to rotate relative to the handle 21, thereby causing the drive rod 22 to drive the piston rod 12 to slide backward relative to the housing 11.

[0070] In this embodiment, the piston rod 12 has a groove 122b on its body 122 that matches the rotating shaft 4. When the rotating shaft 4 is in the second position on the piston rod 12, it is engaged in the groove 122b, allowing it to rotate only relative to the groove 122b. Thus, when the handle 21 rotates to actuate the drive rod 22, the piston rod 12 can slide relative to the housing 11.

[0071] The slide groove 122a is connected to the slot 122b, so that the rotating shaft 4 can enter the slot 122b from the slide groove 122a and also enter the slide groove 122a from the slot 122b, thereby enabling the thrombus aspiration device to switch between electric aspiration mode and manual aspiration mode, and the switching is convenient.

[0072] In this embodiment, the first switch 34 is located above the slide groove 122a, and the slot 122b is located below the slide groove 122a. This prevents the drive rod 22 from touching the first switch 34 when the thrombus aspiration device is in manual aspiration mode, thus avoiding frequent closing and opening of the first switch 34 and affecting its service life.

[0073] The gear 32 and rack 33 can slide relative to each other, thereby enabling the gear 32 and rack 33 to mesh and disengage. In this embodiment, the gear 32 is slidably mounted on the motor shaft, and the rack 33 is fixedly mounted on the rod 122 of the piston rod 12. By driving the gear 32 to slide up and down relative to the motor shaft, the gear 32 and rack 33 can mesh or disengage. Alternatively, the gear 32 can be fixedly mounted on the motor shaft, and the rack 33 can be slidably mounted on the piston rod 12. By sliding the rack 33 up and down relative to the piston rod 12, the gear 32 and rack 33 can also mesh or disengage.

[0074] The thrombus aspiration device also includes a drive assembly. When the drive assembly is operated in the electric aspiration mode, the second switch 35 can be turned off, causing the gear 32 and rack 33 to slide relative to each other, disengaging the mesh between them, and moving the rotating shaft 4 from the first position on the piston rod 12 to the second position. This allows the rotating shaft 4 to enter the slot 122b from the slide groove 122a on the piston rod 12, thus switching the thrombus aspiration device to manual aspiration mode.

[0075] Specifically, such as Figures 4-15 As shown, the drive assembly includes a button 51, which is rotatably mounted on the housing 11. When the button 51 rotates relative to the housing 11, it engages with the gear 32. When the thrombus aspiration device operates in electric mode, the button 51 rotates relative to the housing 11 and engages with the gear 32, causing the gear 32 to slide downward relative to the motor axis, thereby disengaging the gear 32 from the rack 33.

[0076] When the thrombus aspiration device is in electric aspiration mode, button 51 abuts against the second switch 35, causing the second switch 35 to be in the closed state. When button 51 is operated, button 51 rotates relative to housing 11, disengaging it from the second switch 35, thereby changing the second switch 35 from the closed state to the open state.

[0077] The drive assembly also includes a limiting rod 52, which is slidably disposed within the housing 11. The limiting rod 52 abuts against the rotating shaft 4 and directly or indirectly engages with the button 51. In this embodiment, the limiting rod 52 abuts against the gear 32. When the thrombus aspiration device operates the button 51 in electric mode, the button 51 abuts against the gear 32, causing the gear 32 to slide downward relative to the motor axis. The gear 32 acts on the limiting rod 52, causing the limiting rod 52 to slide downward. The limiting rod 52 acts on the rotating shaft 4, causing the rotating shaft 4 to enter the slot 122b from the slide groove 122a.

[0078] The drive assembly also includes a third elastic element 53. The elastic force of the third elastic element 53 is used to drive the gear 32 and the limiting rod 52 to slide upward, thereby causing the gear 32 to mesh with the rack 33. In this embodiment, one end of the third elastic element 53 is disposed on the limiting rod 52, and the other end of the third elastic element 53 is disposed on the motor 31.

[0079] The drive assembly also includes a fourth elastic element 54. The elastic force of the fourth elastic element 54 is used to drive the rotating shaft 4 from the slot 122b into the slide groove 122a, so that the thrombus aspiration device switches from manual aspiration mode to electric aspiration mode. In this embodiment, the fourth elastic element 54 is a torsion spring, one end of the fourth elastic element 54 is disposed on the handle 21, and the other end of the fourth elastic element 54 is disposed on the drive rod 22.

[0080] The thrombus aspiration device also includes a controller 6, and the motor 31 is electrically connected to the controller 6. When the thrombus aspiration device is in electric aspiration mode, the speed of the motor 31 is controlled by the controller 6.

[0081] The first switch 34 and the second switch 35 are also electrically connected to the controller 6. The controller 6 can only start the motor 31 when both the first switch 34 and the second switch 35 are closed.

[0082] like Figures 1-4 , Figure 7 , Figure 10 and Figure 11 As shown, the thrombus aspiration device also includes a pressure sensor 7, which is mounted on the housing 1 and electrically connected to the controller 6. The pressure sensor 7 detects the pressure in the pressure chamber A in real time and feeds it back to the controller 6, which then controls the speed of the motor 31.

[0083] like Figure 2 As shown, the thrombus aspiration device also includes a calibration button 8, which is mounted on the housing 1 and is electrically connected to the controller 6.

[0084] The working principle of this thrombus aspiration device is as follows:

[0085] Initially, the second switch 35 is closed, and the first switch 34 is open. When the thrombus aspiration device begins to aspirate the thrombus at the start of the surgery, it is in electric aspiration mode, meaning the gear 32 and rack 33 are engaged, the rotating shaft 4 is located in the groove 122a on the piston rod 12, and the rotating shaft 4 is directly above the slot 122b. The first switch 34 is located behind the rotating shaft 4. Figures 4-10 As shown. The control method of this thrombus aspiration device in electric aspiration mode is as follows:

[0086] S1 calibrates the pressure value in pressure chamber A.

[0087] The calibration method is as follows: Initially, the aspiration catheter 151 is not connected to the inlet tube 131. The aspiration guidewire 152 is inserted through the sheath into a blood vessel without thrombus. The aspiration catheter 151 with dilator 153 is then inserted along the aspiration guidewire 152 into a blood vessel without thrombus. The aspiration guidewire 152 and dilator 153 are then removed from the aspiration catheter 151, and the aspiration catheter 151 is connected to the inlet tube 131.

[0088] Operating the handle 21 causes the handle 21 to rotate relative to the housing 11, which in turn causes the drive rod 22 to rotate relative to the handle 21 and the piston rod 12, causing the rotating shaft 4 to slide backward in the slide groove 122a. The drive rod 22 will touch the first switch 34, causing the first switch 34 to change from the open state to the closed state.

[0089] Pressing the calibration button 8 causes the controller 6 to control the motor 31 to run at speed V0, driving the gear 32 to rotate synchronously. Through the meshing of the gear 32 and the rack 33, the rack 33 drives the piston rod 12 to slide relative to the housing 11, thereby generating negative pressure in the pressure chamber A. Under the action of negative pressure, blood is drawn from the blood vessels. During the process of drawing 10~15ml of blood, the pressure value in the pressure chamber A under normal blood conditions is detected in real time. The calibrated pressure value B is the average pressure value detected in the pressure chamber A.

[0090] S2, the speed of motor 31 is controlled during thrombus aspiration.

[0091] The thrombus is aspirated using the thrombus aspiration device. The aspiration catheter 151 is repositioned to the location of the thrombus in the blood vessel using the same method described above. The controller 6 starts the motor 31 at a speed of V1 to drive the piston rod 12. V1 ≤ V0, meaning the motor 31 initially operates at a low speed to prevent excessive blood loss from the patient. During this process, a dynamic pressure value A0 is formed in the pressure chamber A. By comparing the dynamic pressure value A0 with the previously calibrated pressure value B, the controller 6 controls the operating speed of the motor 31. The control principle is as follows: Figure 16 As shown, specifically:

[0092] (1) When ≤ If the device fails to aspirate the thrombus, it indicates that the thrombus aspiration device has not aspirated the thrombus. In order to prevent the patient from losing too much blood, the controller 6 controls the motor 31 to maintain the speed V1.

[0093] (2) When > When the thrombus aspiration device has aspirated a thrombus, in order to remove the thrombus as soon as possible and speed up the surgical process, the controller 6 controls the speed of the motor 31 to increase from V1, as follows.

[0094] when < ≤ At that time, the thrombus aspiration device aspirates a small, acute thrombus. The controller 6 controls the motor 31 to increase its speed from V1 to V2 and maintains speed V2. After a certain aspiration time... When the blood clot decreases, it indicates that the blockage is gradually being removed. If... Descending to ≤ At this time, controller 6 controls motor 31 to reduce its speed from V2 to V1. In this embodiment, the value of C ranges from -50 kPa to -10 kPa.

[0095] when < ≤ At that time, the thrombus aspiration device aspirated a large, acute thrombus. The controller 6 then controlled the motor 31 to increase its speed from V2 to V3 and maintained the speed at V3. After a certain aspiration period... When the blood clot decreases, it indicates that the blockage is gradually being removed. If... Descending to < ≤ At that time, controller 6 controls motor 31 to decrease from speed V3 to speed V2; if Continue to decline to ≤ At this time, controller 6 controls motor 31 to reduce its speed from V2 to V1. In this embodiment, the value of D ranges from -85 kPa to -50 kPa.

[0096] when < ≤ At that time, the thrombus aspiration device aspirated large, clumped thrombi. The controller 6 then controlled the motor 31 to increase its speed from V3 to V4 and maintain speed V4. After a certain aspiration time... A decrease indicates that the blood clot has been drawn out. When Continue to decline to ≤ At this time, because the negative pressure in negative pressure chamber A is relatively high, to prevent excessive blood loss from the patient, controller 6 controls motor 31 to directly reduce its speed from V4 to V1. Then, the dynamic pressure value in negative pressure chamber A is checked by pressure sensor 7. Whether it rises, if If the pressure increases, repeat the above steps. In this embodiment, the value of E ranges from -100 kPa to -85 kPa.

[0097] In the entire electric aspiration mode, the thrombus aspiration device can automatically adjust the speed of the motor 31 according to the dynamic pressure value A0 in the negative pressure chamber A detected by the pressure sensor 7. While quickly removing thrombi and shortening the surgical process, it can also avoid excessive blood loss in patients during electric aspiration and greatly reduce the workload of doctors during the operation.

[0098] When the doctor needs to use the manual aspiration mode to aspirate the blood clot, he operates the handle 21 again, and the first switch 34 is touched again by the drive rod 22, so that the first switch 34 changes from the closed state to the open state. The controller 6 stops the motor 31 and the piston rod 12 stops moving.

[0099] The thrombus aspiration device is switched from electric aspiration mode to manual aspiration mode by operating the drive component. Specifically, the button 51 is rotated relative to the housing 11, disengaging the second switch 35 from a closed state to an open state. As the button 51 rotates relative to the housing 11, it simultaneously presses against the gear 32, causing the gear 32 to slide downwards along the motor axis, thereby disengaging from the rack 33. As the gear 32 slides downwards, the limiting rod 52 slides downwards synchronously due to its pressing action, pressing against the rotating shaft 4, causing the rotating shaft 4 to slide downwards into the slot 122b. Thus, the thrombus aspiration device is switched to manual aspiration mode. Figures 8-12 As shown.

[0100] In manual aspiration mode, when the operating handle 21 is rotated relative to the housing 11, the piston rod 12 is driven to slide backward relative to the housing 11 via the drive rod 22. Upon releasing the handle 21, it returns to its original position under the elastic force of the second elastic element 23, and the piston rod 12 slides forward to its original position under the elastic force of the first elastic element 14. This repeated operation causes the piston rod 12 to slide back and forth, thereby generating negative pressure within the pressure chamber A, which then aspirates the thrombus from the blood vessel.

[0101] When the thrombus aspiration device switches from manual aspiration mode to electric aspiration mode, as long as the button 51 is rotated in the opposite direction to reset, the limit rod 52 and gear 32 will slide upward to reset under the elastic force of the third elastic element 53, and the drive rod 22 will move under the elastic force of the fourth elastic element 54 to make the rotating shaft 4 enter the slide groove 122a from the slot 122b.

[0102] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A thrombus suction device comprising a suction assembly, the suction assembly comprising a housing having a pressure chamber, a piston rod reciprocally slidably disposed at one end of the pressure chamber, a liquid inlet pipe and a liquid outlet pipe respectively communicating with the pressure chamber, a one-way valve respectively disposed on the liquid inlet pipe and the liquid outlet pipe, and a suction catheter communicating with the liquid inlet pipe, characterized in that: The thrombus aspiration device also includes a controller and a manual drive device and an electric drive device for driving the piston rod to slide relative to the housing. The manual drive device and the electric drive device can be respectively engaged with or connected to the piston rod. The manual drive device includes a handle rotatably mounted on the housing and a drive rod with one end rotatably connected to the handle, the other end of the drive rod being rotatably connected to the piston rod via a rotating shaft; The electric drive device includes a gear rotatably disposed within the housing, a rack disposed on the piston rod and capable of meshing with the gear, and a motor for driving the gear to rotate, the motor being electrically connected to the controller; The thrombus aspiration device has a manual aspiration mode and an electric aspiration mode; When the thrombus aspiration device is in electric aspiration mode, the manual drive device is engaged or connected to the piston rod at the first position of the piston rod, and the electric drive device is engaged or connected to the piston rod. The control method of the thrombus aspiration device in electric aspiration mode includes: S1, Position the aspiration catheter to a blood vessel without thrombus, and the controller controls the motor to run at speed V0, calibrating the pressure value B in the pressure chamber under normal blood conditions; S2, the aspiration catheter is positioned at the blood vessel with thrombus, and the controller controls the motor to operate at a speed V1, where V1 ≤ V0, so that a dynamic pressure value A0 is formed in the pressure chamber: (1) When |A0|≤|B|, the controller controls the motor to maintain speed V1. (2) When |A0|>|B|, the controller controls the motor to increase from speed V1: When |B|<|A0|≤|C|, the controller controls the motor to increase from speed V1 to speed V2 and maintain the motor at speed V2. When |C|<|A0|≤|D|, the controller controls the motor to increase from speed V2 to speed V3 and maintain the motor at speed V3. When |D|<|A0|≤|E|, the controller controls the motor to increase from speed V3 to speed V4 and maintain the motor at speed V4. When the thrombus aspiration device is in manual aspiration mode, the engagement or connection between the manual drive device and the piston rod is located at the second position of the piston rod, and the engagement or connection between the electric drive device and the piston rod is disengaged. The connection between the first position and the second position allows the engagement or connection between the manual drive device and the piston rod to switch between the first position and the second position.

2. The thrombus aspiration device of claim 1, wherein: When the rotating shaft is in the first position of the piston rod, the rotating shaft can be slidably disposed relative to the piston rod; when the rotating shaft is in the second position of the piston rod, the rotating shaft cannot slide relative to the piston rod.

3. The thrombus aspiration device of claim 2, wherein: The piston rod is provided with a sliding groove and a retaining groove, both of which are matched with the rotating shaft. The sliding groove extends along the sliding direction of the piston rod and is connected to the retaining groove. When the rotating shaft is located at the first position of the piston rod, the rotating shaft is located in the sliding groove and can be slidably arranged along the length extension direction of the sliding groove. When the rotating shaft is located at the second position of the piston rod, the rotating shaft is engaged in the retaining groove.

4. The thrombus aspiration device of claim 2, wherein: The electric drive device includes a first switch disposed within the housing for controlling the start and stop of the electric drive device. When the rotating shaft is located at the first position of the piston rod, rotating the handle relative to the housing can drive the drive rod to abut against the first switch, thereby closing and opening the first switch.

5. The thrombus aspiration device of claim 2, wherein: The thrombus aspiration device further includes a drive assembly for driving the rotating shaft to switch from a first position to a second position. The drive assembly includes a button rotatably disposed on the housing and a limiting rod that directly or indirectly cooperates with the button. The limiting rod is slidably disposed on the housing and abuts against the rotating shaft.

6. The thrombus aspiration device of claim 1, wherein: When the motor maintains speed V2 and the value of |A0| decreases to |A0|≤|B|, the motor decreases from speed V2 to speed V1; when the motor maintains speed V3 and the value of |A0| decreases to |B|<|A0|≤|C|, the motor decreases from speed V3 to speed V2, and the value of |A0| continues to decrease to |A0|≤|B|, and the motor decreases from speed V2 to speed V1; when the motor maintains speed V4 and the value of |A0| continues to decrease to |A0|≤|D|, the motor decreases from speed V4 to speed V1.

7. The thrombus aspiration device of claim 1, wherein: A pressure sensor is installed on the housing to detect the pressure value in the pressure chamber. The pressure sensor is electrically connected to the controller so that the pressure sensor sends a signal to the controller.

8. The thrombus aspiration device of claim 1, wherein: B is the average pressure value in the pressure chamber when the motor operates at speed V0 and draws 10-15ml of normal blood.

9. The thrombus aspiration device of claim 1, wherein: A calibration button is provided on the housing. The calibration button is electrically connected to the controller. When the calibration button is pressed, the controller controls the motor to run at a speed V0.

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