Dental pulp tester

Claim 1

A hand-held dental pulp tester comprising: a. a housing; b. a rigid tube mounted in said housing for movement along the longitudinal axis of said tube and extending therefrom and terminating in a tip; c. a nozzle mounted in said tip; d. a pressurized container of vaporizable coolant mounted in said housing; e. a conduit coupled between said container and said nozzle; f. a normally closed pressure release valve means coupled between said conduit and said container; g. cold actuator means mounted on said housing for opening said valve means to permit cold coolant vapor to be discharged through said conduit to said tip; h. electric heating means mounted in said tip; i. means for mounting a battery in said housing; j. terminal means in said housing for making electrical contact with a battery mounted in said housing; k. normally open switch means connected between said terminal means and said electric heating means; l. heat actuator means mounted on said housing for closing said switch means to energize said heating means and heat said tip; m. high voltage generating means connected between said terminals and said heating means; n. a normally open high voltage switch connected between said terminal and said high voltage generating means; and o. a high voltage actuator mounted on said housing for closing said high voltage switch to apply high voltage to said tip.