| 摘要 |
A disposable dental prophylaxis angle including an elongated housing which defines a longitudinal axis and has a central bore and a head portion in fluid communication with the central bore. A prophylaxis cup is rotatably supported by the head portion and in fluid communication with the central bore through the head portion. An actuator is movably supported by the housing and includes a piston cooperatively received and supported in the central bore. Together, the piston and the central bore define a fluid chamber of decreasable volume located therebetween. A flowable dentifrice material may be contained within this chamber. The actuator is manually movable in the direction of the longitudinal axis of the housing to move the piston within the central bore in an indexing fashion in successive increments of a predetermined distance therealong, to reduce the volume of the chamber and to force the flowable dentifrice material in predetermined, incremental amounts which correspond to the distance traveled by the piston, from the chamber to the prophy cup via the head portion. In addition, the present invention discloses an actuator including a cam and a push rod having a cam follower, an isolation tube and a piston which is movably supported on the isolation tube in one direction but which allows relative movement of the isolation tube in the opposite direction to advance the dentifrice material from the chamber to the prophy cup. In addition, the present invention includes a primary drive gear having flow paths which promote the flow of the dentifrice material therethrough when rotated in one direction. Finally, the present invention also incorporates a paste delivery system having a dentifrice dispensing nipple formed on the head portion of the housing.
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