DEVICE AND METHOD OF THROMBI REMOVAL Russian patent published in 2020 - IPC A61B17/3207 A61B17/22 

FIELD: medicine.

SUBSTANCE: group of inventions relates to devices for blood flow restoration and removal of thrombi from the lumen of blood vessels, in particular clogged cerebral arteries, and a method for removing thrombi with the help of said devices. According to a first embodiment, the blood clot removal device comprises a self-expanding mesh structure having a distal end and a proximal end, and a pusher. Mesh structure is made with possibility of transition from radially compressed state into radially extended state. Pusher is proximal to the mesh structure and comprises a proximal radiopaque mark of the device. Mesh structure at the distal end comprises distal radiopaque labels of the device attached to the mesh structure with the help of a binding agent. Mesh structure and pusher are connected by means of connection including connecting unit, connecting coupling and binding agent. Connecting assembly is formed by bent end of pusher inserted into element of mesh structure. Connector is arranged above connecting assembly. Binding agent covers at least a part of the connecting unit including a part of the bent end of the pusher not closed with the coupling. According to the second embodiment of the device for thrombotic removal, the pusher is located proximal to the proximal end of the mesh structure, and the binding agent covers a portion of the outer surface of the distal radiopaque labels of the device, as well as the proximal and distal ends of the distal radiopaque labels of the device. Method for removing a blood clot from a cerebral vascularisation system involves moving a self-expanding mesh structure in a radially compressed state within a microcatheter to a thrombus in a vessel by a pusher. Mesh structure is positioned relative to the blood clot such that the distal end of the mesh structure is located distal to the distal thrombotic boundary, and the proximal end of the mesh structure is located proximal to the proximal thrombotic boundary. Further, the mesh structure is visualized in the vessel by X-ray imaging using the proximal radiopaque mark of the device and the distal radiopaque labels of the device. Distal radio-opaque labels of the device are attached to the distal end of the mesh structure with a binding agent. Further, the mesh structure is held in a fixed position by holding the pusher in one position, and the microcatheter is withdrawn proximally so that the mesh structure changes from a radially compressed state into a radially expanded state and exerts radial force action on thrombus with connection of mesh structure with thrombus. Thereafter, a microcatheter and an integrated mass consisting of a mesh structure and a thrombus are removed from the patient's body by co-drawing the pusher and the microcatheter in a proximal direction, wherein connection of pusher and mesh structure is made in form of connecting unit, above which connecting coupling is located, and connecting assembly is formed by bent end of pusher inserted into element of mesh structure.

EFFECT: increased speed and efficiency of blood clots thrombosis extraction without thrombosis destruction, which is achieved by reducing the injury rate of the vascular device, reduced probability of integrity of device during operation for removal of blood clot when using devices and implementation of method.

19 cl, 6 dwg