Patent ID: 8210846

Claim:
An interface structure for connecting a handle portion ( 12 ) of a droplet jet teeth cleaning system to a head assembly portion ( 18 ), comprising: a handle portion containing a source of fluid from which droplets may be produced in the head portion and a source of gas for accelerating the resulting droplets to a desired velocity, including separate supply lines ( 14 , 16 ) for liquid and gas in the handle; a head assembly having separate supply lines ( 28 , 30 ) for liquid and gas and an assembly for accelerating the liquid droplets out of the head assembly using gas from the gas supply line therein, wherein the handle liquid and handle gas supply lines, respectively, are arranged to align only with the head liquid and head gas supply lines when the head is operatively positioned on the handle; and a sealing interface arrangement ( 15 , 17 , 20 , 21 , 22 ) for sealing the head gas line directly to the handle gas line and the head liquid line directly to the handle liquid line, respectively, when the head portion is operatively positioned on the handle portion, wherein the handle and head portions are so configured, with or without a locking member, that the head and handle portions can be locked together with the respective gas lines and the respective fluid lines being in a directly sealed relationship and such that as the head portion is positioned onto the handle portion, the respective liquid lines and gas lines in the head and handle come into registry as a result.