Orificial diagnostic instrument

Claim 1

IN A MEDICAL DIAGNOSTIC INSTRUMENT: (A) A DISPOSABLE SPECULUM OF RELATIVELY THIN-WALLED, PLASTIC MATERIAL, SAID SPECULUM HAVING A SUBSTANTIALLY FRUSTO-CONICAL OUTER SURFACE FOR INSERTION INTO A BODY CAVITY AND AN INSIDE WALL INCLUDING A CENTRALLY LOCATED GRADUALLY TAPERED WALL REGION PROVIDING A HOLLOW INTERIOR; AND (B) AN OBTURATOR CARRIED WITHIN THE SPECULUM COMPRISING: (1) A SMOOTH, ROUNDED, FRUSTO-CONICAL MEMBER ADAPTED FOR INSERTION FROM THE PROXIMAL END OF SAID SPECULUM THROUGH ITS HOLLOW INTERIOR TO EXTEND PARTIALLY THROUGH THE DISTAL END THEREOF; AND (2) A STEM FOR SAID OBTURATOR COMPRISING A ROD LIKE MEMBER OF PLASTIC MATERIAL SECURED AT ITS DISTAL END TO SAID FRUSTO-CONICAL MEMBER AND HAVING A HAND ENGAGING PORTION AT ITS PROXIMAL END; AND (3) MEANS FOR CENTERING THE OBTURATOR STEM IN SAID SPECULUM WHEN THE INSERTION MEMBER EXTENDS THROUGH THE DISTAL END OF SAID SPECULUM COMPRISING STOP MEANS HAVING ESSENTIALLY RADIALLY PROJECTING SURFACES LOCATED ALONG A CENTRAL PORTION OF AND INTEGRAL WITH SAID STEM AND ESSENTIALLY LONGITUDINALLY EXTENDING SURFACES TO ABOUT THE INSIDE WALL OF SAID SPECULUM AT SAID CENTRALLY LOCATED GRADUALLY TAPERED WALL REGION THEREBY CENTERING THE OBTURATOR WITHIN THE SPECULUM AND REINFORCING THE STEM AGAINST BENDING WHILE PREVENTING THE INSERTING MEMBER ON THE OBTURATOR FROM PASSING COMPLETELY THROUGH THE DISTAL END OF SAID SPECULUM.