Water caloric systems and methods for inducing nystagmus

Claim 1

A liquid caloric system for inducing nystagmus in patients, said system comprising bath means for storing liquids to be delivered to the patient's ear for inducing nystagmus, means for measuring the nystagmus response of the patients, said bath means comprising a pair of air tight liquid containers, air pressure means for forcing the liquid from each of the containers, said air pressure means comprising a control section common to both of said containers, means for coupling said common control section to external sources of compressed air commonly available in physicians offices, said common control section comprising air pressure control means for controlling the actual air pressure delivered to said container, means for heating the liquid in at least one of said containers, said means for heating the liquid including means for monitoring and controlling the temperature of the liquid, air tube means separately coupling air under pressure from said common control section to each of said containers, said air tube means comprising at least one tube extending to and along the bottom of said at least one container, said one tube having perforations therein to enable air under pressure to escape from the tube to agitate the liquid and assure equal temperature throughout the heated bath, air tube valve means in said air tube means to cause air to selectively flow to the extension along the bottom of said container or to exit the one tube at the top of the liquid, and delivery tubes attached to each of the containers for delivering the liquids to the ears of patients at controlled rates regardless of the position of the delivery tubes relative to the height of the containers.