Patent Application
20120022467
The invention here disclosed relates primarily to syringes and in particular those typically used for medical purposes that allow unintended dispensement of fluid substances from the syringes main staging chamber.
The main purpose of the improvement here disclosed is to provide a reliable, safe, simple and low cost method of passively and automatically locking a syringe from unintended dispensement of its contents when and only when not engaged for its ultimate purpose and allowing for automatic unlocking whenever and however many times a syringe is engaged for its ultimate purpose upon at least two points of contact.
Various attempts to create syringe locks have been made such as the locking mechanism disclosed by Watts (20070049872-A1 US). These attempts allow effective locking control by way of the deliberative action of the user to engage the locking mechanism. Further, the locking mechanism is disclosed as a separate part which will lead to inconsistent use where safety is a factor.
The invention here disclosed provides passive locking control of the syringe plunger in its preferred embodiments. Further, the preferred embodiments accomplish the said passive locking control within a simple low cost and easy to manufacture and implement structure.
Passive locking control is necessary to ensure maximum effective use, application safety enhancement and reduced waste including that of sometimes expensive medical supplies.
As illustrated by FIGS. 1,2 & 5, the syringe cylinder-case, FIG. ______, is molded with a locking slip collar ______ attached in a manner to allow purposeful concentric engagement with the open end of the syringe cylinder-case ______ after the plastic molding process is complete as illustrated in
As illustrated in
As illustrated in
As illustrated in FIGS. 2+3 once the locking slip collar ______ is rotated into its final working position engagement of the syringe arrangement for its intended purpose automatically and reliably displaces the locking slip collar ______ in the opposite direction of the displacement of the plunger arrangement ______ and the wedge seat arrangement ______ which facilitates disengagement of the locking slip collar allowing low resistance displacement of the plunger arrangement ______ towards the distal end of the cylinder-case end to a selectively desired displacement.
As illustrated in FIGS. ______+______ the locking slip collar ______ can be manually rotated clockwise engaging thread tabs as part of the syringe cylinder ______ that effectively drive and lock the locking slip collar linearly into its fully engaged position restricting free displacement of the plunger assembly ______. Rotating the locking slip collar counter clockwise past the neutral default-passive position engages thread tabs ______ that effectively drive and lock the locking slip collar linearly in its fully disengaged position allowing free displacement of the plunger assembly ______.
In the preferred embodiment the plunger ______ includes a simple one way locking lip ______ at it's distil end which allows the plunger ______ to pass through the locking slip collar ______ and allows a full range of dual direction slidable connection with the locking slip collar ______ but disallows reverse direction disengagement of the plunger passed the locking lip ______ in order to discourage disengagement of the primary purpose passive safety feature as may be desired.
