A lantern-shaped pulmonary embolism thrombus removal device

Abstract

This invention relates to the field of medical technology. The objective is to provide a lantern-shaped pulmonary embolism thrombus removal device, comprising a drive cylinder, a suction cylinder disposed at the lower end of the drive cylinder and communicating with it, and a thrombectomy tube inserted via a catheter at the location of the thrombus. The suction cylinder contains a suction piston that moves vertically and mates with the inner cavity of the suction cylinder. The drive cylinder contains a drive rod, the lower end of which extends into the suction cylinder and connects to the suction piston. The upper end of the drive cylinder has a cap with a centrally located helical hole. The upper section of the drive rod has a helical segment that mates with the helical hole, the helical segment of which passes through the helical hole, and the upper end of the drive rod is connected to a tail plate via a rotary joint. This invention enables simultaneous rotational fragmentation and suction of the thrombus, greatly improving thrombectomy efficiency, while also exhibiting a simple structure and good stability.

Description

[0001] This application is a divisional application. The original application was filed on October 28, 2024, with application number 202411510358.9 and invention title "A pulmonary embolism thrombus clearing device". Technical Field

[0002] This invention relates to the field of medical technology, specifically to a thrombus removal device. Background Technology

[0003] Acute pulmonary embolism is a common cardiovascular disease. It is a clinical and pathophysiological syndrome caused by the detachment of endogenous or exogenous emboli (deep vein thrombosis is the main source of thrombi causing pulmonary embolism, often caused by the detachment of thrombi formed from deep vein thrombosis in the lower extremities) that obstruct the pulmonary artery, resulting in pulmonary circulation disorders. It has an extremely high mortality rate and seriously endangers the health and quality of life of patients.

[0004] Therefore, eliminating thrombi is the core process in the entire treatment. Currently, common thrombus removal devices fall into two main categories: stent-type and guidewire-type. Both stent-type and guidewire-type devices work by constructing a filter at the distal end. After the device reaches the thrombus location via a catheter, the stent-type device expands and breaks up the thrombus during the expansion process (some products have externally driven rotation). The guidewire-type device, on the other hand, inserts a guidewire into the thrombus and rotates it under external drive to break up the thrombus. The broken thrombus fragments are blocked by the filter and finally, with the help of external suction equipment, the broken thrombus fragments are aspirated and discharged to achieve the effect of thrombus removal.

[0005] However, both stent-type and guidewire-type stents require external active aspiration equipment to remove the thrombus only after it has been broken up. They cannot remove the thrombus directly during the cutting and breaking process. This results in a low overall thrombus removal efficiency and a higher risk of blockage due to the need for a unified aspiration and removal process at a single time point.

[0006] Therefore, if a simple method can be used to simultaneously aspirate and remove the thrombus during the thrombus fragmentation process, it will greatly improve the efficiency of thrombus removal and reduce the risk of embolism. Summary of the Invention

[0007] The purpose of this invention is to provide a lantern-shaped pulmonary embolism thrombus removal device that simultaneously performs fragmentation and suction.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a lantern-shaped pulmonary embolism thrombus removal device, comprising a drive cylinder, a suction cylinder disposed at the lower end of the drive cylinder and connected to the drive cylinder, and a thrombus removal tube that can be inserted into the thrombus location via a catheter.

[0009] The suction cylinder is equipped with a suction piston that moves vertically and mates with the inner cavity of the suction cylinder. The drive cylinder contains a drive rod, the lower end of which extends into the suction cylinder and connects to the suction piston. The upper end of the drive cylinder has a cap with a centrally located helical hole. The upper section of the drive rod has a helical segment that mates with the helical hole, and the helical segment passes through the helical hole. The upper end of the drive rod is connected to a tail plate via a rotary joint. When an axial pushing or pulling force is applied to the drive rod through the tail plate, the drive rod and the suction piston rotate simultaneously while moving axially.

[0010] The end of the thrombectomy tube is provided with a crushing component, and the head end of the thrombectomy tube is located at the bottom of the suction cylinder and forms a rotational engagement with the suction cylinder; a rotational transmission assembly is provided between the thrombectomy tube and the suction piston, and the rotational transmission assembly can transmit torque to the thrombectomy tube during the lifting and lowering of the suction piston.

[0011] The rotary transmission assembly includes several elastic connecting wires. The upper end of each elastic connecting wire is connected to the bottom of the suction piston, and the lower end is connected to the upper end of the thrombectomy tube. The elastic connecting wires are arranged in a ring-shaped lantern around the thrombectomy tube.

[0012] Preferably, the breaking component is a spiral-shaped elastic filament.

[0013] Preferably, the breaking component is a lantern-shaped expansion frame.

[0014] Preferably, a side drain pipe is provided at the lower part of one side of the suction cylinder, and a one-way valve with one-way communication from the inside to the outside is provided on the side drain pipe.

[0015] Preferably, the head end of the defibrillation tube is provided with a one-way valve to prevent liquid from flowing from the suction cylinder toward the defibrillation tube.

[0016] Preferably, a pinch drive mechanism is also provided outside the drive cylinder. The pinch drive mechanism includes two pinch rods. The upper ends of the two pinch rods are respectively hinged to both sides of the tail plate, and the lower ends are hinged to one end of a short connecting rod. The other end of the short connecting rod is hinged to one side of the lower part of the drive cylinder.

[0017] Preferably, the middle section of the grip bar is provided with a finger ring for the operator's fingers to pass through.

[0018] The beneficial effects of this invention are mainly reflected in its ability to simultaneously perform rotational fragmentation and aspiration of thrombi, greatly improving thrombectomy efficiency, while maintaining a simple structure and good stability. Specifically, in use, the invention first places a catheter and performs routine procedures such as thrombolytic drug administration through the catheter; then, the thrombectomy tube is inserted into the thrombus location via the catheter, with the thrombectomy component at the end of the tube penetrating the thrombus and positioned using contrast imaging. Once in place, the drive rod moves axially upwards, causing the aspiration piston to rise, thereby generating negative pressure suction. Simultaneously, during the upward movement of the drive rod, due to the presence of the helical section and helical hole, the drive rod rotates continuously, thereby sequentially driving the aspiration piston, rotational transmission assembly, and thrombectomy tube to rotate. The fragmentation component at the end of the thrombectomy tube also rotates, thus cutting and fragmenting the thrombus. This invention can simultaneously perform aspiration to remove the fragmented thrombus fragments, greatly improving thrombectomy efficiency and preventing secondary accumulation of fragmented thrombus fragments, significantly reducing the risk of catheter blockage. Furthermore, the overall structure of this invention is simple and compact, using passive mechanical drive, which can greatly reduce medical costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0021] Figure 3 for Figure 1 Enlarged view of section B in the middle. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings. The embodiments described are only some embodiments of the present invention, and not all embodiments. They are intended to enable those skilled in the art to better implement the invention in engineering, and are not intended to limit the use of the present invention.

[0023] The purpose of this invention is to provide a lantern-shaped pulmonary embolism thrombus removal device, which can follow the catheter inserted into the thrombus site within the blood vessel and perform real-time and rapid thrombus removal in conjunction with contrast imaging. It has dual functions of fracturing and aspiration, and can achieve simultaneous fracturing and aspiration. Furthermore, due to its passive mechanical drive, the overall structure is simple and compact, resulting in low manufacturing costs and significantly reducing medical expenses.

[0024] This invention comprises a main body and a thrombectomy catheter, the main body serving as the operating end, and the thrombectomy catheter being inserted into the thrombus site via a catheter. Figure 1As shown in the illustration, the length of the thrombectomy tube 3 is shown to be relatively short for simplification; in actual operation, its proportion can be designed according to needs. The present invention includes a drive cylinder 1, a suction cylinder 2 disposed at the lower end of the drive cylinder 1 and communicating with the drive cylinder 1, and a thrombectomy tube 3 capable of being inserted into the thrombus location via a catheter.

[0025] As the active motion driving device of the present invention, the suction cylinder 2 is provided with a suction piston 4 that moves vertically and cooperates with the inner cavity of the suction cylinder 2. The drive cylinder 1 is provided with a drive rod 5 (for driving the suction piston 4 to rise, fall, and rotate). The lower end of the drive rod 5 extends into the suction cylinder 2 and is connected to the suction piston 4. The vertical movement of the drive rod 5 drives the suction piston 4 to rise and fall.

[0026] To synchronously drive the rotation of the suction piston 4, the upper end of the drive cylinder 1 is provided with a cylinder cover 6 with a centrally located helical hole. The upper section of the drive rod 5 is provided with a helical segment 7 that mates with the helical hole. The helical segment 7 of the drive rod 5 passes through the helical hole, thereby enabling the drive rod 5 to rotate during axial movement. Simultaneously, the upper end of the drive rod 5 is connected to the tail plate 9 via a rotary joint 8. Pushing or pulling the tail plate 9 drives the drive rod 5. The rotary joint 8 releases the rotational force generated during the lifting and lowering of the drive rod 5, preventing the operating end (tail plate 9) from being affected by rotation.

[0027] With the above structure, when the tail plate 9 applies an axial pushing or pulling force to the drive rod 5, the present invention can drive the drive rod 5 and the suction piston 4 to rotate while moving axially. Of course, for easier operation, a ring can be provided on the tail plate 9 to facilitate pushing and pulling. This structure is the simplest, but since it requires pushing and pulling the tail plate 9 on one hand and stabilizing the drive cylinder 1 on the other, it often requires two-handed operation.

[0028] Therefore, a better approach of this invention is to achieve convenient one-handed operation through structural design, such as... Figure 1 As shown, a pinching drive mechanism is also provided outside the drive cylinder 1. The pinching drive mechanism includes two pinching rods 15. The upper ends of the two pinching rods 15 are respectively hinged to both sides of the tail plate 9, and the lower ends are hinged to one end of the short connecting rod 16. The other end of the short connecting rod 16 is hinged to one side of the lower part of the drive cylinder 1. By pinching and releasing the pinching rods 15, operation can be achieved in a one-handed holding state. A finger ring 17 is provided on the middle section of the pinching rod 15 for the operator's fingers to pass through, so that the operator's fingers can pass through, making it easy to control the pinching and releasing of the pinching rod 15.

[0029] The end of the thrombectomy tube 3 described in this invention is provided with a crushing component 10, and the head end of the thrombectomy tube 3 is located at the bottom of the suction cylinder 2, forming a rotatable engagement with the suction cylinder 2. A rotational transmission assembly is provided between the thrombectomy tube 3 and the suction piston 4. This assembly can transmit the rotation of the suction piston 4 to the thrombectomy tube 3. However, since the suction piston 4 has a lifting and lowering state, torque is transmitted to the thrombectomy tube 3 during the lifting and lowering process. To achieve the above functions, this invention briefly describes two different rotational transmission assembly structures. Of course, more forms and structural designs are feasible as long as the same effect is achieved.

[0030] Two rotary transmission assembly structures: 1. The rotary transmission assembly includes several elastic connecting wires. The upper end of each elastic connecting wire is connected to the bottom of the suction piston 4, and the lower end is connected to the upper end of the unclog removal tube 3. The elastic connecting wires are arranged in a ring-like lantern shape around the unclog removal tube 3. That is, the elastic connecting wires are distributed in a lantern-like frame shape, possessing a certain degree of flexibility, allowing them to adapt and bend during the lifting and lowering of the suction piston 4. 2. That is... Figure 3 The structure shown includes a piston hinge joint 11 at the bottom of the suction piston 4, a tube hinge joint 12 at the upper end of the ejector tube 3, and at least one V-shaped transmission rod 13. The middle section of the transmission rod 13 is hinged, and the upper and lower ends of the transmission rod 13 are respectively hinged to the piston hinge joint 11 and the tube hinge joint 12. In this case, generally two transmission rods 13 are provided, with the V-shaped openings of the two transmission rods 13 facing inward and symmetrically distributed on both sides of the ejector tube 3 to ensure balance and reliability.

[0031] Regarding the specific form of the crushing component 10 of the present invention, it can be a spiral-shaped elastic filament. While inside the conduit, it maintains its straightness for easy insertion, and after being discharged from the conduit, it can elastically return to a spiral shape. Of course, it is also feasible to use a shape memory alloy material for fabrication. In addition to the above, the crushing component 10 of the present invention can also be a lantern-shaped expansion frame, composed of multiple crushing filaments distributed in a lantern skeleton shape, which can also be bundled into a linear shape inside the conduit for easy insertion.

[0032] In addition, to facilitate the removal of thrombi and fluid aspirated into the aspiration cylinder 2, a side drain pipe 14 is provided on the lower part of one side of the aspiration cylinder 2, and a one-way valve with one-way communication from the inside to the outside is provided on the side drain pipe 14. Furthermore, to simultaneously control backflow at the thrombectomy tube 3, a one-way valve can be provided at the head end of the thrombectomy tube 3 to prevent fluid from flowing from the aspiration cylinder 2 towards the thrombectomy tube 3.

[0033] The above embodiments are merely preferred embodiments of the present invention. Those skilled in the art can make appropriate modifications to the technical solutions provided by the present invention according to actual engineering situations, and such modifications and equivalent transformations do not depart from the scope of protection claimed by the present invention. The scope of protection claimed by the present invention shall be determined by the appended claims.

Claims

1. A lantern-shaped pulmonary embolism thrombus removal device, characterized in that: It includes a drive cylinder (1), an aspiration cylinder (2) located at the lower end of the drive cylinder (1) and connected to the drive cylinder (1), and a thrombectomy tube (3) that can be inserted into the thrombus location via a catheter. The suction cylinder (2) is provided with a suction piston (4) that moves vertically and cooperates with the inner cavity of the suction cylinder (2); the drive cylinder (1) is provided with a drive rod (5), the lower end of the drive rod (5) extends into the suction cylinder (2) and is connected to the suction piston (4); the upper end of the drive cylinder (1) is provided with a cylinder cover (6) with a spiral hole in the center, the upper section of the drive rod (5) is provided with a spiral section (7) that cooperates with the spiral hole, the spiral section (7) of the drive rod (5) passes through the spiral hole, and the upper end of the drive rod (5) is connected to the tail plate (9) through a rotary joint (8); when an axial pushing and pulling force is applied to the drive rod (5) through the tail plate (9), the drive rod (5) and the suction piston (4) can rotate while moving axially; The end of the thrombectomy tube (3) is provided with a breaker (10), and the head end of the thrombectomy tube (3) is located at the bottom of the suction cylinder (2) and forms a rotational engagement with the suction cylinder (2); a rotational transmission assembly is provided between the thrombectomy tube (3) and the suction piston (4), and the rotational transmission assembly can transmit torque to the thrombectomy tube (3) during the lifting and lowering of the suction piston (4); The rotary transmission assembly includes several elastic connecting wires. The upper end of the elastic connecting wire is connected to the bottom of the suction piston (4), and the lower end is connected to the upper end of the thrombectomy tube (3). The several elastic connecting wires are distributed in a ring-shaped lantern around the thrombectomy tube (3).

2. The lantern-shaped pulmonary embolism thrombus removal device according to claim 1, characterized in that: The broken component (10) is a spiral elastic filament.

3. The lantern-shaped pulmonary embolism thrombus removal device according to claim 2, characterized in that: The broken component (10) is a lantern-shaped expansion frame.

4. The lantern-shaped pulmonary embolism thrombus removal device according to claim 3, characterized in that: A side drain pipe (14) is provided on the lower part of one side of the suction cylinder (2), and a one-way valve with one-way communication from the inside to the outside is provided on the side drain pipe (14).

5. The lantern-shaped pulmonary embolism thrombus removal device according to claim 4, characterized in that: The head end of the defibrillator (3) is provided with a one-way valve to prevent liquid from flowing from the suction cylinder (2) toward the defibrillator (3).

6. The lantern-shaped pulmonary embolism thrombus removal device according to claim 5, characterized in that: The drive cylinder (1) is also provided with a pinch drive mechanism, which includes two pinch rods (15). The upper ends of the two pinch rods (15) are respectively hinged to the two sides of the tail plate (9), and the lower ends are hinged to one end of the short connecting rod (16). The other end of the short connecting rod (16) is hinged to one side of the lower part of the drive cylinder (1).

7. The lantern-shaped pulmonary embolism thrombus removal device according to claim 6, characterized in that: The middle section of the grip lever (15) is provided with a finger ring (17) for the operator's fingers to pass through.

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