A biopsy needle including a stylet with a tissue collection notch formed in the shaft. The tissue collection notch is shaped in the form of a section of a circle in order to maximize the size of the tissue collected and to maximize the ability of the stylet to resist bending....http://www.google.fr/patents/US5449001?utm_source=gb-gplus-shareBrevet US5449001 - Biopsy needle
