Frontal attachment for dental syringe with oblique needle advancement and retraction
Inventors
Assignees
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Publication Number
US-10617831-B2
Publication Date
2020-04-14
Expiration Date
Abstract
A frontal attachment for a conventional aspirating dental syringe comprising a barrel connector housing releasably attachable to the front end of the barrel of an aspirating dental syringe, an injection needle guide attached to the barrel connector housing, an injection needle attached to and supported by a needle holder assembly reciprocatably disposed in a needle guide slot between the injection needle guide and the barrel connector housing in oblique relation to the longitudinal axis of the aspirating dental syringe, and a second needle projecting rearwardly from the barrel connector housing to establish fluid communication with a carpule disposed in the conventional aspirating dental syringe.
Core Innovation
The invention describes a detachable frontal attachment for a conventional aspirating dental syringe. Its injection needle holder slides obliquely in a guide slot, keeping the injection needle unexposed between uses and advancing it into coaxial alignment and fluid communication with a rearwardly projecting carpule-piercing needle for use.
The described problem is the risk associated with an exposed needle and recapping. The attachment is intended to reduce exposed-needle and recapping risks without modifying the conventional syringe. A spring returns the injection needle toward its protected position and presses the holder against an annular fluid seal in the use position to reduce leakage.
Claims Coverage
Independent claim 1 covers the frontal attachment for an aspirating dental syringe through four main inventive features.
Releasably attachable barrel connector housing
A barrel connector housing is releasably attachable to a front end of a barrel of the aspirating dental syringe.
Obliquely positioned injection needle guide and holder assembly
An injection needle guide is attached to the barrel connector housing, and an injection needle attached to and supported by a needle holder assembly is disposed in a slot between the guide and housing in oblique relation to the syringe's longitudinal axis.
Rearwardly projecting second needle
A rearwardly projecting second needle is coaxially aligned with and configured to penetrate an elastomeric septum or other liquid barrier disposed in a front end of a carpule inserted into the aspirating dental syringe.
Reciprocating needle holder assembly
The needle holder assembly is configured to move between a first position in which the injection needle is unexposed and oriented obliquely to the syringe's longitudinal axis, and a second position in which it projects forwardly from the guide opening and is coaxially aligned with and in fluid communication with the rearwardly projecting second needle.
Independent claim 1 combines a releasable syringe attachment, an obliquely supported injection needle that moves between protected and use positions, and a rearwardly projecting needle configured to penetrate the carpule barrier.
Stated Advantages
The attachment is intended to reduce exposed-needle and recapping risks without modifying the conventional syringe.
The annular fluid seal is described as reducing leakage in the use position.
Documented Applications
Use as a detachable frontal attachment for a conventional aspirating dental syringe.
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