Warm water dental syringe

Claim 1

A warm water dental syringe comprising: a head having a water passage and an air passage therethrough; a tip extending from the head and having a water passage therethrough communicating with the water passage through the head, and an air passage therethrough communicating with the air passage through the head; an elongate tube adapted to be grasped as a handle and defining in its interior a water chamber, the tube having upper and lower ends; a plug in each of said ends closing the same and defining with the inner wall of said tube said water chamber, each plug having water and air passages therethrough; coupling means for releasably securing the upper end of the tube to the head so that the water passage through the upper end of the tube communicates with the water passage through the head and so that the air passage through the upper end of the tube communicates with the air passage through the head; an air conduit mounted in the chamber and extending between and communicating with the air passages in said upper and lower plugs; connecting means for attaching a water supply hose and an air supply hose at the lower end of the tube so that water can flow into the chamber through the water passage through the lower end of the tube and air can flow into the air conduit through the air passage through the lower end of the tube; a first elongate cylindrical casing mounted within the water chamber and extending substantially the entire length thereof; an electric heater element mounted in said first elongate cylindrical casing for heating the water in said chamber; a second elongate cylindrical casing mounted within the water chamber and spaced from the first casing; an electric thermostat mounted in said second elongate cylindrical casing for controlling the heater element to regulate the temperature of the water in the chamber; said first and second casings extending through said lower mounting plug whereby said heater element and said thermostat may be easily replaced.