Medical and surgical measuring apparatus, equipment, devices and instruments for determining volume and cross-section of vessels, lumens, vagina, uterus, esophagus, sphincters, esophageal sphincters and cervix in the human or animal body; medical and surgical apparatus, equipment, devices and instruments for dilating vessels, lumens, vagina, uterus, esophagus, sphincters, esophageal sphincters and cervix in the human or animal body; medical and surgical apparatus, equipment, devices and instr...