Dentistry – Apparatus – Having intra-oral dispensing means
Reexamination Certificate
2010-09-17
2011-10-04
Stigell, Theodore (Department: 3767)
Dentistry
Apparatus
Having intra-oral dispensing means
C604S198000, C604S192000
Reexamination Certificate
active
08029279
ABSTRACT:
An improved safety hypodermic syringe for dental applications which further includes first finger grip, preferably a thumb ring, on the end of the plunger, forward finger holders and a lock mechanism, which includes extending fingers for grasping the top of the reciprocal sliding sheath. The syringe assembly also includes a reciprocal tubular needle sheath disposed on the exterior of the syringe body and a latch mechanism engaging the syringe body and the sheath to latch the sheath in a needle-covering position after delivering contents from the syringe body. The fingers, preferably biased by a living hinge hold back the locking ring while the dentist administers anesthesia through the syringe. An internal spring, which engages the syringe body and the sheath, expands to move the sheath to cover the needle point. The spring is a non-uniform helical spring having multiple 360° turns with each turn uniformly spaced from adjacent turns.
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EPO International Search Report and Written Opinion of International Application No. PCT/US2009/004526, mailed Dec. 22, 2009.
Hayman Imani
Koppel, Patrick, Heybl & Philpott
Protectus Medical Devices, Inc.
Ram Michael J.
Stigell Theodore
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