An obturator assembly having a removable obturator tip, a first engagement device, an obturator shaft, a second engagement device, and a biased flexible member, whereby the obturator tip may be removed by flexing the flexible member against its bias, and a plurality of different obturator tips may be...http://www.google.com/patents/US6544277?utm_source=gb-gplus-sharePatent US6544277 - Obturator assembly
