Hollow needle for the extraction of follicular units with extended bevel geometry

Abstract

A hollow needle (100) for extracting follicular units from a donor area of ​​the skin, comprising: a shaft (110) with a proximal end and a distal end and with a longitudinal axis (AN), wherein the shaft (110) has a cylindrical shaft section with a wall thickness (w) and an inner diameter (ID), and a bevel geometry (120) at the distal end with a cutting edge (131) and an inner edge (116), wherein the inner edge (116) has an atraumatic threading geometry, characterized in that the bevel geometry (120) has an axially measured bevel length (1) of at least 0.8 millimeters, wherein the ratio of the bevel length (1) to the wall thickness (w) is at least 3:1, and wherein the bevel geometry (120) has an outer contour that is symmetrical or asymmetrical with respect to the longitudinal axis (AN) and converges distally. exhibits, whose outer diameter (AD), measured in cross-sections perpendicular to the longitudinal axis (AN),decreases in the direction of the cutting edge (131).