Patent ID: 6827692
Filing Date: 2004-12-07
Classification: A61B

Abstract:
A biopsy needle, comprising an external cannula and a closing stem adapted to slide inside the cannula, wherein the cannula has, in the vicinity of an opening, one portion having a relatively small thickness and one portion of larger thickness set at a penetrating mouth of the cannula, the two portions of cannula of different thickness forming together a step set inside the cannula and developed along a plane inclined with respect to an axis of the cannula; and wherein inserted between the cannula and the stem is a withholding element adapted to slide axially independently of the stem and of the cannula, and which has, in the vicinity of the mouth of the cannula, one end provided with an extension said extension sliding with respect to the cannula and in the direction of the mouth of the cannula, said extension designed to engage with said inclined step and to undergo deflection so as to close the mouth of the cannula and to withhold a tissue specimen inside the needle.