Goniometer apparatus for brain surgery

Claim 1

A GONIOMETER HAVING AN ANGUALRLY ADJUSTABLE CANNULA GUIDE AND BEING ADAPTED FOR ATTACHING OVER A TREPHINE IN A PATIENT''S SKULL, THUS PERMITTING A SURGEON TO REACH A PREDETERMINED AREA OF THE PATIENT''S BRAIN WITH A CANNULA OR OTHER INSTRUMENT GUIDED BY THE CANNULA GUIDE AND COMPRISING: A BASE HAVING AN UPPER AND A LOWER END WITH AN AXIAL BORE EXTENDING THROUGH SAID ENDS, THE LOWER END BEING CONTOURED AND ADAPTED FOR EXTERNALLY JOINING IN A FIXED NON-ROTATING MANNER TO A CONVEX SURFACE AND THE UPPER END HAVING A SEAT COAXIAL WITH SAID BORE, AND AN INDEXING HEAD REMOVABLY JOINED TO SAID BASE FOR LEAVING SAID BASE IN FIXED POSITION ON THE PATIENT WHEN SAID INDEXING HEAD IS REMOVED AND THUS PREVENTING BODY FLUIDS FLOWING FROM THE TREPHINE IN PATIENT''S SKULL AND THROUGH SAID BASE FROM ENTERING AND ENCRUSTING ON SAID INDEXING HEAD; SAID INDEXING HEAD COMPRISING A BASE COLLAR REMOVABLY JOINED TO SAID BASE, A CANNULA GUIDE THE LOWER END OF WHICH ENGAGES WITH THE SEAT IN SAID BASE WHEN SAID INDEXING HEAD IS JOINED TO SAID BASE, A FIRST QUADRANT MEANS PIVOTALLY JOINED AT THE LOWER END TO SAID BASE COLLAR AND SLIDABLY ENGAGING THE UPPER PORTION OF SAID CANNULA GUIDE, A SECOND QUADRANT MEANS PIVOTALLY JOINED AT THE LOWER END OF SAID BASE COLAR TO BE SUPERIMPOSED AT SUBSTANTIALLY 90* TO SAID FIRST QUADRANT MEANS AND SLIDABLY ENGAGING THE UPPER PORTION OF SAID CANNULA GUIDE A FIRST ADJUSTING MEANS JOINED TO SAID FIRST QUANDRANT MEANS AND PIVOTALLY MOVING SAID CANNULA GUIDE ON SAID BASE AND PIVOTING SAID SECOND QUADRANT MEANS ON SAID BASE COLLAR, AND A SECOND ADJUSTING MEANS JOINED TO SAID SECOND QUADRANT MEANS AND PIVOTALLY MOVING SAID CANNULA GUIDE ON SAID BASE AND PIVOTING SAID FIRST QUADRANT MEANS ON SAID BASE COLLAR.