A puncture tool with a variable cross-section

Abstract

The tool includes a group of elongated segments (2) with spikes (3) for piercing into biological material. The segments (2) are parallel to each other and are also guided parallel to the longitudinal axis of the needle (1), while being placed in a guide that allows the movement of the segments (2) between the first position A with a minimum mutual distance of the segments (2) in the transverse plane and the second position B with the maximum distance between the segments (2) in the transverse plane. In the second position B, the distal end (6) of the needle (1) is inserted inside between the distal ends of the segments (2) and is ready to aspirate the thick fluid from the injected biological material. Advantageously, the tool has three segments (2), whose transverse profile has the shape of the letter L, where the arms (4) form an angle of 60°. The needle (1) preferably has a triangular cross-section with the shape of an equilateral triangle. The lateral guide between the segments can have a lamella (11) firmly connected to one segment (2) and two guide protrusions (12) firmly connected to an adjacent segment (2), where the guide protrusions (12) slide against the opposite edges of the lamella (11).