Importance

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Abstract

The outer diameter of a hollow needle, comprising a ground surface at its tip, expands continuously from a region near the tip but behind the ground surface such that the outer diameter in the region located further from the tip is approximately double. The rotationally symmetrical transition region is conical and rounded off at each end. In use, the ground tip surface of the puncture needle cuts through the skin, the intermediate tissue and the wall of the blood vessel. The wider part of the hollow needle causes the puncture point to widen. Due to having a primary puncture of small diameter and then widening the puncture hole to the diameter required for introducing a correspondingly thick catheter, the traumatic injury to the blood vessel thereafter recedes relatively quickly back to the smaller diameter of the puncture. Accordingly, the time for healing a wound is limited to that required for a smaller hole.

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First Claim