Patent ID: 8066510

Claim:
A dental agent applicator comprising: a barrel being hollow and having a proximal end; a distal end; and a chamber defined axially and longitudinally through the barrel and having an inner surface; a sealing plug mounted in and selectively obstructing the chamber of the barrel; a delivery head mounted movably on the distal end of the barrel and having a hub being hollow, mounted movably in the distal end into the chamber of the barrel and selectively moving the sealing plug to un-obstruct and make the chamber communicate with the hub and having an outside end and an inside end; and a nozzle tip being hollow and mounted on the outside end of the hub; and a plunger mounted slidably in the chamber from the proximal end of the barrel; wherein the barrel further has an inner annular flange formed on and protruding radially inward from the inner surface of the chamber close to the distal end and dividing the chamber into an inside space and an outside space located adjacent to the distal end, and the inner annular flange has a central hole defined through the inner annular flange and communicating with the chamber; wherein the sealing plug is engaged hermetically and detachably with the central hole of the inner annular flange; wherein the hub of the delivery head selectively presses against and disengages the sealing plug from the central hole of the inner annular flange and further has a channel defined through the hub and selectively communicating with the inside space of the chamber; wherein the nozzle tip of the delivery head has an outlet end and a passageway defined through the nozzle tip and communicating with the channel of the hub; wherein the barrel further has an inner thread formed on the inner surface of the chamber between the distal end and the inner annular flange; wherein the delivery head is screwed into the distal end of the barrel and the hub further has an outer thread formed on the hub and engaged with the inner thread of the barrel to selectively and longitudinally move the hub in the barrel; wherein the sealing plug has an annular outer edge, multiple notches defined radially in the annular outer edge, and a cylinder stopper formed on and protruding axially from the sealing plug, mounted detachably in and sealing the central hole of the inner annular flange; and wherein the hub further has a connecting tube formed on and protruding longitudinally from the inside end of the hub, located adjacent to the outer thread, communicating with the channel and selectively pushing the cylinder stopper of the sealing plug out of the central hole of the inner annular flange and simultaneously mounted in the central hole.