A fetal pulse oximetry sensor device containing a pulse oximetry sensor is disclosed. The device also includes a spiral for fetal attachment. One or both of the light emitting portion and light detecting portion of the pulse oximetry sensor is spring biased to be moveable with respect to the body of...http://www.google.es/patents/US5411024?utm_source=gb-gplus-sharePatente US5411024 - Fetal pulse oximetry sensor
