Dental syringes

Claim 1

A DENTAL SYRINGE COMPRISING A TUBULAR HANDLE HAVING SEPARATE AIR AND WATER PASSAGES THEREIN, A PAIR OF NORMALLY-CLOSED VALVE MEMBERS MOUNTED FOR INDEPENDENT AXIAL MOVEMENT WITHIN SAID HANDLE FOR CONTROLLING THE FLOW OF WATER AND AIR THROUGH SAID PASSAGES, A VALVE SELECTOR BODY MOUNTED WITHIN SAID HANDLE FOR AXIAL AND ROTATIONAL MOVEMENT THEREIN, SAID BODY BEING ROTATABLE BETWEEN FIRST POSITION REGISTERABLE WITH SAID WATER VALVE MEMBER, A SECOND POSITION REGISTERABLE WITH SAID AIR VALVE MEMBER, AND A THIRD POSITION REGISTERABLE WITH BOTH OF SAID VALVE MEMBERS, SAID BODY BEING AXIALLY MOVABLE FOR SELECTIVELY ENGAGING AND UNSEATING THE VALVE MEMBERS IN REGISTER THEREWITH, A FIRST CONTROL MEMBER OPERATIVELY ASSOCIATED WITH SAID BODY AND BEING MOVABLE TO SHIFT SAID BODY AXIALLY INTO CONTACT WITH SAID VALVE MEMBERS FOR UNSEATING THE SAME, A SECOND CONTROL MEMBER ALSO OPERATIVELY ASSOCIATED WITH SAID BODY AND BEING MOVABLE TO ROTATE SAID BODY INTO REGISTER WITH SELECTED VALVE MEMBERS, SAID CONTROL MEMBERS BOTH HAVING PORTIONS EXTENDING EXTERNALLY OF SAID HANDLE ON GENERALLY OPPOSITE SIDES THEREOF FOR PERMITTING ONE-HANDED AND SUBSTANTIALLY SIMULTANEOUS MANIPULATION THEREBY BY A USER, AND AN ELECTRIC HEATING ELEMENT DISPOSED WITHIN SAID WATER PASSAGE, SAID AIR PASSAGE EXTENDING CONCENTRICALLY ABOUT SAID WATER PASSAGE IN THE ZONE OF SAID HEATING ELEMENT FOR THE HEATING OF AIR PASSING THROUGH SAID HANDLE AND FOR THE INSULATING OF SAID HANDLE AGAINST HEAT FROM SAID ELEMENT.