Dispensing – Plural sources – compartment – containers and/or spaced jacket – With discharge assistant for each source
Reexamination Certificate
2002-05-23
2003-05-20
Kaufman, Joseph A. (Department: 3754)
Dispensing
Plural sources, compartment, containers and/or spaced jacket
With discharge assistant for each source
C222S145600, C222S153090, C222S386000, C222S459000, C239S399000
Reexamination Certificate
active
06564972
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to multiple-barreled devices for mixing together and dispensing viscous substances. More particularly, the invention relates to a double-barreled syringe having a double-barreled plunger of unitary construction for dispensing an admixture formed when two gels stored in the barrels are simultaneously discharged into a mixing tip having a five section static mixing element. The tip, which interlocks with the syringe body, is detachable and may be replaced by a locking closure cap to prevent leakage when the syringe is not in use. The locking closure cap preferably has a liner which mitigates undesirable leakage during transport and storage.
2. Description of the Related Art
Devices for mixing and dispensing a viscous fluid having separately stored constituents wherein a mixing portion is detachably connected to a storage portion are known in the art. U.S. Pat. No. 5,413,253 to C. Simmen discloses a static mixer for connection to a cartridge having at least two chambers containing different materials. The mixer is connected to the cartridge by inserting hollow circular make prongs and arcuate positioning keys of a center plug within corresponding female outlets in the cartridge. The plug is rotatably mounted within the collar of a sleeve. The mixer is locked to the cartridge by rotating the collar until opposed tabs on the sleeve engage with locking arms on the dispensing end of the cartridge.
U.S. Pat. No. 4,538,920 to G. E. Drake discloses a double-barreled syringe for mixing and dispensing a two-component material such as a resin and its hardener. Both a mixing tip and a static mixing element located within the tip bore are flexibly rotationally aligned with the syringe body so that the first blade of the mixing element is generally perpendicular to the plane of contiguity between the two component streams exiting a syringe body outlet. The mixing tip is connected to the body by centering the tip inlet over the body outlet while aligning the tip so that it can be pushed between opposed bayonet locking tabs, each having a prong and a stop surface, and then rotating the tip so that opposed ramps on the tip inlet end are wedged between the prongs, and a stop surface proximate to each ramp engages a tab stop surface.
Although either of these devices enables the storage and mixing portions to be connected and then detached multiple times, both are so complex as to be unsuitable for mass production of inexpensive, throwaway dispensers. What is needed is a device which on demand can thoroughly mix two-component viscous materials and dispense a desired amount of the admixture, which will not leak when set aside, and which can be mass produced at relatively little cost.
OBJECTS OF THE INVENTION
Accordingly, it is an object of the present invention to provide a simple, reliable and convenient device which simultaneously dispenses equal amounts of two well mixed viscous materials as an admixture.
Another object of the invention is to provide a device which can be repetitively used to dispense desired amounts of an admixture.
A further object of the invention is to provide a device having a storage portion and a mixing-dispensing portion which repetitively can be easily connected and then detached, wherein the storage portion does not leak during storage and transport thereof.
A still further object of the invention is to provide a device that is inexpensive to manufacture.
Other objects of the invention will become evident when the following description is considered with the accompanying drawing figures. In the figures and description, numerals indicate the various features of the invention, like numerals referring to like features throughout both the drawings and the descriptions.
SUMMARY OF INVENTION
These and other objects are achieved by the present invention which provides a double-barreled syringe wherein one barrel contains a hydrogen peroxide water-based gel formulation used for teeth whitening, and the other contains a gel formulation including compounds that will accelerate the release of oxygen from the first formulation and consequently increase the reaction rate of the teeth whitening process. The syringe dispenses an admixture formed when the two formulations are simultaneously discharged into a mixing tip having a static mixing element. The tip, which is in locking connection with the syringe body, is replaced by a locking closure cap to prevent leakage when the syringe is not in use.
The syringe body includes a double-barrel assembly having juxtaposed first and second barrels having a common length and a generally cylindrical bore of a common diameter. Each barrel is bounded at a discharge end by first and second shoulders, respectively, with each shoulder having a generally planar surface. The surfaces are coplanar and contiguous. A generally cylindrical neck extends from and is symmetrically disposed between the shoulders. The neck includes first and second outlet passages. Each barrel at its opposite (plunger) end closely receives a piston within its bore. An arcuately-shaped finger-grip circumscribes the contiguous plunger ends of the barrels.
The syringe body further includes a double-plunger assembly having juxtaposed first and second plungers of a common length. Each plunger extends at a proximal end in an end-piece rigidly attached to one of the pistons, and is rigidly attached at a distal end to a thumb-rest common to the plungers.
Alternatively, each plunger has a seal formed integrally therewith at a distal end thereof. The seal preferably comprises a flare having a wall thickness which is sufficiently thin as to flexibly conform to the bore within which it is contained and thus seal the plunger upon which it is formed with respect to the bore.
Further, according to the preferred embodiment of the present invention an alignment ring is formed proximate the distal end of each plunger. The alignment ring is formed proximal of the seal. The alignment ring enhances alignment of the seal with respect to the barrel within which the seal is disposed. The alignment ring is coupled comparatively flexibly to the shaft of the plunger and the alignment ring is coupled comparatively rigidly to the seal, so as to allow the combination of the alignment ring and the seal to move together as a unit with respect to the shaft while also causing the alignment ring and the seal to remain comparatively fixed in position with respect to one another. In this manner, the alignment ring and the seal remain aligned with respect to the bore within which they are disposed regardless of bending of the shaft of the plunger which may occur during use.
According to the preferred embodiment of the present invention, the alignment ring is attached to the shaft by a first neck and the seal is attached to the alignment ring by a second neck. The first neck has a smaller diameter than the second neck so as to facilitate movement of the combination of the alignment ring and the seal relative to the shaft, while maintaining desired relative alignment of the alignment ring with respect to the seal. Thus, the combination of the alignment ring and the seal tends to move as a unit with respect to the shaft (which may bend independently of the alignment ring and the seal).
The syringe body further includes a first mating assembly having diametrically opposed first and second detents extending outwardly from the neck, and opposed first and second locking ribs symmetrically disposed with respect to the neck and rigidly attached, respectively, to the first and second shoulders. Each rib has a plurality of generally planar locking faces generally parallel to and at a common predetermined distance from the neighboring shoulder surface.
The syringe further includes a generally conical mixing tip hag an inlet end and a discharge end and a bore therethrough. The bore has a generally cylindrical portion at the inlet end and extends in a conically tapered portion toward the discharge end. The cylindrical bore portion is determined by
Hayman Robert G.
Hussey Lance
Sawhney Ravi K.
Christie Parker & Hale LLP
Dixcus Dental Impressions, Inc.
Kaufman Joseph A.
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