US-12616492-B2 - Thrombectomy device and thrombectomy system

US12616492B2US 12616492 B2US12616492 B2US 12616492B2US-12616492-B2

Abstract

Disclosed are a thrombectomy device and a thrombectomy system, where the thrombectomy device includes a thrombectomy net, a pushing tube, and a thrombectomy tube, where the thrombectomy tube is provided with a tube cavity, the thrombectomy net has a radial contraction state and a radial expansion state, and a proximal end of the thrombectomy net is fixedly connected to a distal end of the pushing tube. The thrombectomy device further includes an action tube provided with a first action block and a second action block. A distal end of the thrombectomy net is sleeved on the action tube and slides within a limited range of distance between the first action block and the second action block. When relative displacement against the pushing tube occurs, the thrombectomy net is driven to radially contract or expand. Therefore, the contraction and expansion of the thrombectomy net of the present disclosure are controllable.

Inventors

Hongjuan JING
Jiaping HUANG
Changfen KE

Assignees

HANGZHOU EXCEED MEDICAL TECHNOLOGY CO., LTD

Dates

Publication Date: 20260505
Application Date: 20231205
Priority Date: 20221206

Claims (10)

1 . A thrombectomy system, comprising a thrombectomy device ( 100 ), and a thrombus trapping device ( 200 ), the thrombectomy device ( 100 ) comprises a thrombectomy net ( 4 ), and a pushing tube ( 2 ), the pushing tube ( 2 ) is connected with the thrombectomy net ( 4 ), the thrombus trapping device ( 200 ) comprises a sheath tube ( 19 ), a trapping tube ( 20 ) and a trapping net ( 21 ) that can be stored in the sheath tube ( 19 ), both the trapping net ( 21 ) and the thrombectomy net ( 4 ) have a radial contraction state and a radial expansion state, the trapping net ( 21 ) is fixedly connected to the trapping tube ( 20 ), the pushing tube ( 2 ) is configured to push the thrombectomy net ( 4 ) into the blood vessel for thrombectomy and to withdraw the thrombectomy net ( 4 ) with an embedded thrombus back into the sheath tube ( 19 ), and the trapping net ( 21 ) is configured to at least partially wrap the thrombectomy net ( 4 ) in the process that the thrombectomy net ( 4 ) with the embedded thrombus is withdrawn back into the sheath tube ( 19 ), after completion of the thrombectomy through the thrombectomy net ( 4 ) and before the trapping net ( 21 ) wraps at least part of the thrombectomy net ( 4 ), the entire thrombectomy net ( 4 ) is in a contracted state at least in a stage, and the trapping net ( 21 ) is turned over from inside to outside to form an outward flipping state, with an inward flipping guide surface ( 24 ), when the trapping tube ( 20 ) and the pushing tube ( 2 ) are moved synchronously from the distal end to the proximal end, the sheath tube ( 19 ) abuts against the trapping net ( 21 ) to make the trapping net ( 21 ) flip inward, exposed inside of the trapping net ( 21 ) is quickly flipped inward along the inward flipping guide surface ( 24 ) to at least partially wrap the thrombectomy net ( 4 ), and is withdrawn back into the sheath tube ( 19 ) together with the thrombectomy net ( 4 ); the thrombectomy device ( 100 ) further includes an action tube ( 3 ), the action tube ( 3 ) is at least partially and slidably arranged in the pushing tube ( 2 ), the action tube ( 3 ) is provided with a first action block ( 5 ) and a second action block ( 6 ) that are both fixed on the action tube and spaced apart from each other, a distal end of the thrombectomy net ( 4 ) is fixedly connected to a sliding block ( 7 ) and converged at the sliding block ( 7 ) to form a retraction end, the sliding block ( 7 ) is sleeved on the action tube ( 3 ) and configured to slide within a limited range of distance between the first action block ( 5 ) and the second action block ( 6 ), the first action block ( 5 ) is located inside the thrombectomy net ( 4 ), the second action block ( 6 ) is located outside the thrombectomy net ( 4 ), when relative displacement against the pushing tube ( 2 ) occurs after the action tube ( 3 ) is pushed from the proximal end to the distal end, the action tube ( 3 ) can drive the sliding block ( 7 ) to slide toward the distal end direction through the first action block ( 5 ) so that the thrombectomy net ( 4 ) elongates to radially contract, when relative displacement against the pushing tube ( 2 ) occurs after the action tube ( 3 ) is pulled from the distal end to the proximal end, the action tube ( 3 ) can drive the sliding block ( 7 ) to slide toward the proximal end direction through the second action block ( 6 ) so that the thrombectomy net ( 4 ) shortens to radially expand.
2 . The thrombectomy system according to claim 1 , wherein the thrombectomy net ( 4 ) comprises a first thrombectomy subnet ( 8 ) and a second thrombectomy subnet ( 9 ) connected in sequence, the first thrombectomy subnet ( 8 ) is configured for separating a thrombus from a blood vessel by cutting the thrombus therein, and the second thrombectomy subnet ( 9 ) is configured for collecting the thrombus separated out, the trapping net ( 21 ) is configured to at least partially wrap the first thrombectomy subnet ( 8 ).
3 . The thrombectomy system according to claim 2 , wherein when relative displacement against the pushing tube ( 2 ) occurs after the action tube ( 3 ) is configured to move in a predetermined direction, the first thrombectomy subnet ( 8 ) and the second thrombectomy subnet ( 9 ) are driven to radially contract or to radially expand.
4 . The thrombectomy system according to claim 3 , wherein the action tube ( 3 ), the pushing tube ( 2 ), the trapping tube ( 20 ), and the sheath tube ( 19 ) are coaxially arranged.
5 . The thrombectomy system according to claim 3 , wherein a distal end of the second thrombectomy subnet ( 9 ) is sleeved on the action tube ( 3 ) and is capable to slide within a limited range of distance between the first action block ( 5 ) and the second action block ( 6 ), a proximal end of the first thrombectomy subnet ( 8 ) is fixedly connected to a distal end of the pushing tube ( 2 ).
6 . The thrombectomy system according to claim 5 , wherein relative displacement against the pushing tube ( 2 ) occurs after the action tube ( 3 ) is pushed from the proximal end to the distal end, the pushing tube ( 2 ), by means of the first action block ( 5 ), is capable to drive the first thrombectomy subnet ( 8 ) and the second thrombectomy subnet ( 9 ) to radially contract; the first action block ( 5 ) is an annular boss protruding from the outer surface of the action tube ( 3 ), used for supporting the thrombectomy net ( 4 ) to ensure that the thrombectomy net ( 4 ) still has a certain thrombus storage space when in the radially contracted state.
7 . The thrombectomy system according to claim 5 , wherein relative displacement against the pushing tube ( 2 ) occurs after the action tube ( 3 ) is pulled from the distal end to the proximal end, the action tube ( 3 ), by means of the second action block ( 6 ), is capable to drive the first thrombectomy subnet ( 8 ) and the second thrombectomy subnet ( 9 ) to radially expand.
8 . The thrombectomy system according to claim 2 , wherein the trapping net ( 21 ) is provided with a first open end ( 22 ) and a second open end ( 23 ) that are axially opposite to each other, before the trapping net ( 21 ) wraps at least part of the first thrombectomy subnet ( 8 ), the first open end ( 22 ) is flipped inward and relatively fixedly connected to a distal end of the trapping tube ( 20 ) to form the distal end of the trapping net ( 21 ), and the second open end ( 23 ) is a free end and is formed as a proximal end of the trapping net ( 21 ).
9 . The thrombectomy system according to claim 8 , wherein the inward flipping guide surface ( 24 ) is formed at a location near the first open end ( 22 ) of the trapping net ( 21 ); the trapping tube ( 20 ) includes an outer layer ( 25 ), an elastic net ( 26 ), and an inner layer ( 27 ) coaxially arranged, with the elastic net ( 26 ) positioned between the outer layer ( 25 ) and the inner layer ( 27 ); a distal end of the elastic net ( 26 ) is fixedly connected to the first open end ( 22 ) of the trapping net ( 21 ), or a distal end of the elastic net ( 26 ) extends beyond the distal end of the trapping tube ( 20 ) and then flips outward to form the trapping net ( 21 ).
10 . The thrombectomy system according to claim 8 , wherein when the trapping tube ( 20 ) and the pushing tube ( 2 ) are moved synchronously from the distal end to the proximal end, and after the trapping net ( 21 ) is flipped inward in place, the first open end ( 22 ) is formed as the proximal end of the trapping net ( 21 ), and the second open end ( 23 ) is formed as the distal end of the trapping net ( 21 ).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priorities from the Chinese patent applications 2022115529629 and 2022115529192 filed Dec. 6, 2022, and from 202310139023X and 2023101139824, filed Feb. 8, 2023, the content of which are incorporated herein in the entirety by reference. TECHNICAL FIELD The present disclosure relates to the technical field of medical devices, and particularly relates to a thrombectomy device and a thrombectomy system. BACKGROUND Mechanical thrombectomy is a process of conveying a thrombectomy device to a lesion site to capture the thrombus and ultimately take the thrombus out of a human body. Existing mechanical thrombectomy means generally include direct thrombectomy, thrombus fragmentation by laser, and thrombectomy through a capture device, where the direct thrombectomy achieves more thorough thrombectomy, but causes excessive damage to vascular walls and easily leads to various concurrent inflammations. In contrast, the thrombus fragmentation by laser is very difficult, because too low laser energy will cause failure of operation, while too high energy might damage blood vessels, easily causing various complications. Therefore, currently the capture device is most commonly used for thrombectomy. The capture device is used to achieve thrombectomy through a thrombectomy net with automatic expansion properties. For example, a Chinese patent CN104068911A discloses a vascular thrombectomy apparatus and a thrombectomy device, as well as a specific process of thrombectomy as follows: conveying the thrombectomy net to a lesion site in a blood vessel, releasing the thrombectomy net, locating the thrombectomy net through a developing marker, gradually expanding by means of an elastic force of the thrombectomy net to make the thrombectomy net attached to the vascular wall, withdrawing the thrombectomy net to capture the thrombus, and finally taking the thrombectomy net out of the body of a patient to complete the thrombectomy. The thrombectomy device disclosed in the patent CN104068911A fully utilizes the thrombectomy net with automatic expansion properties to achieve its contraction and expansion. However, when a blood vessel has complex lesions, such as existence of a superhard thrombosis, the thrombectomy net maybe is not capable to expand smoothly, which might result in that the thrombectomy device cannot be “opened”, thus further leading to failure or a poor effect of thrombectomy. SUMMARY In view of the above defects in the prior art, the present disclosure provides a thrombectomy device and a thrombectomy system to solve the technical problem. The present disclosure provides a thrombectomy device, and the thrombectomy device includes a thrombectomy net, a pushing tube, and a thrombectomy tube, where the thrombectomy tube is provided with a tube cavity that accommodates the thrombectomy net and the pushing tube, the thrombectomy net has a radial contraction state and a radial expansion state, and a proximal end of the thrombectomy net is fixedly connected to a distal end of the pushing tube. The thrombectomy device further includes an action tube provided with a first action block and a second action block, where the first action block and the second action block are both fixed on the action tube and spaced apart from each other. A distal end of the thrombectomy net is sleeved on the action tube and is capable to slide within a limited range of distance between the first action block and the second action block. When relative displacement against the pushing tube occurs after the action tube is configured to move in a predetermined direction, the thrombectomy net is driven to radially contract by means of the first action block or to radially expand by means of the second action block. The thrombectomy net includes a first thrombectomy subnet and a second thrombectomy subnet. An action structure is arranged between the action tube and the first thrombectomy subnet, and the action structure is configured to drive the first thrombectomy subnet to shorten and expand radially, when the action tube, by means of the second action block, drives a distal end of the second thrombectomy subnet to slide towards a proximal end thereof so as to make the second thrombectomy subnet expand radially. Further, the proximal end of the first thrombectomy subnet is an open end and fixedly connected to the distal end of the pushing tube, the distal end of the first thrombectomy subnet and the proximal end of the second thrombectomy subnet are both open ends and connected in a smooth transition manner, and the distal end of the second thrombectomy subnet is fixedly connected to a sliding block and converged at the sliding block to form a retraction end, where the sliding block is sleeved on the action tube and configured to slide within a limited range of distance between the first action block and the second action block. Further, the first thrombectomy subnet is a cutting stent confi