Dosing device including cartridge
A dental cartridge for dispensing a dental material having a body portion made of a material transparent to at least a portion of the visible light spectrum and opaque to the actinic light of the dental material contained therein. The dental cartridge is supplied with a to-be driven piston which is constructed of two affixed parts in tandem, a forward portion and a rearward portion. The forward portion is more resilient than the rearward portion. The rearward portion is affixed to the forward portion by a peg system that fits into the forward portion.
1 . A cartridge specially adapted to be mounted in an ejector type gun, comprising: a hollow cylindrical cartridge body having an inner wall defining an elongate inner chamber open at one end of the body and adapted at the open end to be detachably and operatively mounted to said ejector gun and having at the opposite end of the body an orifice to allow discharge of a dental composition from the inner chamber; and a piston inserted into the open end of said body, said piston having a forward portion and a rearward portion, said forward portion and said rearward portion being affixed to one another, said forward portion being constructed of a resilient polymeric material, said rearward portion being constructed of a polymeric material that is relatively less resilient than the forward portion; said forward portion of said piston having an elongate leading cylindrical portion that has a smaller diameter than the piston and mates with the forward portion of the piston with a rounded shoulder, the elongate leading cylindrical portion terminates in a rounded nose, said piston adapted to slidably fit within said hollow cylindrical cartridge in a relative leak proof manner.
2 . The hollow cylindrical cartridge body of claim 1 wherein the discharging dental composition may be a light activated dental composition and wherein the hollow cylindrical body being made of a material transparent to at least a portion of the visible light spectrum and opaque to the actinic light of the dental composition.
3 . The hollow cylindrical cartridge body of claim 2 wherein the open end of the cartridge has a flange externally thereabout.
4 . The hollow cylindrical cartridge body of claim 3 wherein said orifice terminates in a nozzle, said nozzle also being made of a material transparent to at least a portion of the visible light spectrum and opaque to the actinic light of the dental composition whereby the dentist can visually see the dental composition contained in the cartridge while preventing hardening of the dental material contained therein.
5 . The hollow cylindrical cartridge body of claim 1 wherein the top of the rearward portion of the piston has a projection comprising of a substantially upstanding short rod terminating in a disc which is larger in diameter than said short rod; the downward facing bottom of the forward portion of the piston has a recess adapted and constructed to accept and retain said rearward portion of said piston.
6 . The hollow cylindrical cartridge body of claim 5 wherein the discharging dental composition may be a light activated dental composition and wherein the hollow cylindrical body being made of a material transparent to at least a portion of the visible light spectrum and opaque to the actinic light of the dental composition.
7 . The hollow cylindrical cartridge body of claim 5 wherein the open end of the cartridge has a flange thereabout.
8 . The hollow cylindrical cartridge body of claim 5 where said orifice terminates in a nozzle, said nozzle also being made of a material transparent to at least a portion of the visible light spectrum and opaque to the actinic light of the dental composition whereby the dentist can visually see the dental composition contained in the cartridge while preventing hardening of the dental material contained therein.