▎ 摘　　要

NOVELTY - The nanocatheter has two coiled tubes of graphene which welded along the entire length with corresponding inlet and outlet apertures at the ends. Each tube is a single structure of a variable section and consists of two portions. The first portion is made with large diameter and length relative to the second portion. The cross-sectional dimension of the two tubes of the first portion is 2 nm at a length of 20-25 cm. The total cross-sectional dimension of the two tubes of the second portion is 0.5 nm at a length of 0.01-0.1 cm. USE - Nanocatheter for introducing/extracting intercellular fluid from/into biological medium. ADVANTAGE - The safe delivery or extraction of intercellular fluid into certain point zones of biological media can be achieved. The resolution of pathological process is facilitated. The drugs are prevented from reaching the lesion in sufficient concentration for the required period of time thus the effectiveness of treatment can be reduced.