Patent ID: 8764442

Claim:
A hand-held oral hygiene applicator for conveniently providing a clinician user the ability to express prophy paste while the applicator is in therapeutic use within a patient's mouth, the applicator comprising: a prophy angle housing comprising a distal end and a proximal end, the prophy angle housing configured to permit the clinician to conveniently handle the prophy angle housing at the proximal end while the distal end is placed within a patient's mouth during use, the prophy angle housing being further configured to permit the clinician to simultaneously control the expression of paste while providing the desired treatment to the patient, the housing further comprising a paste dispensing outlet proximal the distal end of the housing, the housing configured to permit securement of a rotatable head assembly to the housing concentrically with the paste dispensing outlet; a first drive mechanism positioned within the prophy angle housing comprising a drive shaft for delivering mechanical energy to the rotatable head assembly, a chamber substantially enclosed within the prophy angle housing, the chamber configured to store paste in a controlled releasable manner such that the paste is precluded from contacting the first drive mechanism, the chamber being configured to permit expression of paste by the clinician from the proximal end of the prophy angle housing; and an independent second drive mechanism provided within the prophy angle housing and positioned coaxially with the first drive mechanism, the second drive mechanism configured to deliver a controlled amount of paste from the chamber to the distal end of the prophy angle housing for as needed expression thereof to the patient by the clinician, the second drive mechanism comprising a shaft including a tapered helical blade at a distal end of the second drive mechanism and a helical thread at a proximal end of the second drive mechanism, the second drive mechanism further comprising an actuator positioned at or proximate the proximal end of the prophy angle housing, and a rotatable index wheel engaging the actuator so that the wheel may be driven in a stepped rotational manner upon actuation of the actuator by the clinician, the index wheel further engaging a barrel within the chamber where the barrel is rotatably supported and configured to be secured to and advance distally on the helical thread, the barrel axially exerting pressure against the paste within the chamber for delivering a controlled quantity of paste toward the distal end of the prophy angle, wherein the independent second drive mechanism operates independently from the first drive mechanism so that paste is dispensed as the clinician desires rather than continuously, regardless of actuation of the 1st drive mechanism.