The present invention provides a medical device for measuring cervical dilation, where the medical device is positionable about a hand having first and second fingers, with each finger having a tip and a side surface. The medical device may include a housing, a first extension element movably coupled...http://www.google.es/patents/US7811239?utm_source=gb-gplus-sharePatente US7811239 - Cervical dilation measurement apparatus
