An instrument and method for the biopsy of cervical tissue samples uses a needle-stylet having a sharp tip and a tissue sample cradle. A sheath surrounds the stylet and is advanced to sever tissue. A barrier disk on the sheath limits its penetration into the tissue....http://www.google.fr/patents/US6083177?utm_source=gb-gplus-shareBrevet US6083177 - Cervical biopsy device and method
