CATHETER ASSEMBLY CONTAINING WIRE GUIDE FOR TEMPORARY BLOOD VESSEL OCLUSION AND ITS APPLICATION Russian patent published in 2021 - IPC A61B17/12 A61N1/05 A61N1/36 

FIELD: medicine; medical equipment.

SUBSTANCE: group of inventions relates to the field of medicine and medical devices, in particular to the field of catheter devices, namely, to a wire guide for use in a catheter assembly, to a catheter assembly for temporary occlusion a section of a target vessel, and to the use of a catheter assembly for the treatment of complications in blood vessels. A controlled wire guide for use in a catheter assembly contains an expandable distal end assembly and a pivoting hinge connecting the specified expandable assembly to the specified wire guide. The expandable distal end assembly is designed to transition from a retracted state to an expanded state and return to a retracted state and is arranged in a substantially conical configuration. A catheter assembly for temporary blocking a portion of a target vessel comprises a first tube, the above-described wire guide, located within the said first tube. If necessary, the specified wire guide is located in the second tube located inside the specified first tube. The specified first and/or second tube is made of or coated with a non-adhesive material containing polytetrafluoroethylene (PTFE) or perfluoroalcoxy (PFA), and the specified first tube contains one or more side holes. The use of the above-described catheter assembly for temporary occlusion of the vessel includes the following steps: a. penetration into the vein by means of a hollow needle puncture; b. introduction of a wire guide; c. advancing the catheter assembly to the desired position; d. removal of the wire guide; e. loading of the controlled wire guide into the specified catheter, with the expandable assembly temporary fixed in the retracted state inside the sliding sleeve of the specified catheter; f. advancing the expandable assembly inside the specified catheter by pushing the attached wire guide; g. release of the expandable assembly from the sliding sleeve when it is inside the catheter or when it reaches its distal position inside the catheter; h. positioning the catheter assembly above the area intended for occlusion; i. removing the catheter while holding the wire guide in place until the expandable assembly is released and expanded; j. if necessary, through at least one contact, an electric current can be used to divert the vein walls to support tight occlusion and/or reduce the diameter of the target vein; k. retraction and positioning of the extended assembly by pulling back the wire guide to ensure that the target vessel is blocked; l. if necessary, the closure is tested by introducing a foamed salt solution or an ultrasonic contrast agent; m. implementation of foam sclerosing therapy; n. advancing the catheter to collect the expanded assembly; o. withdrawal of the expanded assembly by pulling its wire guide to the position inside the catheter, wherein, if necessary, this step includes additional injection of foam to fill the cavity of lateral branching veins; р. if necessary, additional scleropene injections can be carried out; q. if necessary, the oclusion device can be used on at least one other site, depending on the requirements of the sclerotherapy; r. removal of the controlled wire guide and catheter assembly from the vein.

EFFECT: inventions provide accurate, temporary and completely reversible occlusion in tortuous or branched regions or vascular junctions that are not rectangular like most blood vessels.

12 cl, 11 dwg