Frontal attachment device for syringe with rotationally activated retractable needle
Inventors
Shaw, Thomas J. • Small, Mark • Zhu, Ni
Assignees
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Publication Number
US-10342929-B2
Publication Date
2019-07-09
Expiration Date
Abstract
A medical device attachable to the front of a conventional syringe and having a hub assembly selectively attachable to the syringe, a nose projecting forwardly from the hub assembly, a rearwardly biased needle retraction mechanism seated inside the nose, a retractable needle projecting forwardly of the nose, and a fluid flow path from the fluid chamber through the hub assembly, nose, needle retraction assembly and needle, wherein the needle is retracted into the nose and a retraction tube external to the syringe by rotating the syringe relative to the nose.
Core Innovation
The medical device is selectively attachable to a syringe and features a hub and a laterally spaced retraction tube interconnected by a frame member. A nose carries a rearwardly biased needle retraction mechanism and a forward-projecting retractable needle. A fluid flow path extends from the syringe fluid chamber through the hub and nose to the retractable needle.
The nose and hub assembly rotate relative to each other about a longitudinal axis that is parallel to and offset from the longitudinal axes through the needle and retraction tube. This relative rotation selectively aligns the needle with the retraction tube, permitting the needle to retract directly into the tube.
Claims Coverage
The claim coverage includes four inventive features across two independent claims covering a syringe-attachable structure and rotationally activated needle retraction.
Syringe-attachable hub assembly with a retraction tube
Independent claim 1 recites a hub assembly comprising a hub, a retraction tube laterally spaced apart from the hub, and a frame member interconnecting them in substantially fixed, laterally spaced-apart relation.
Rotatable nose with a fluid path and retractable needle
Independent claim 1 recites a nose rotatably attached to the hub assembly about an axis parallel to and offset from the axes through the hub and needle and through the retraction tube, a rearwardly biased needle retraction mechanism, a retractable needle, and a fluid flow path through the assembly.
Hub assembly rotatable relative to the nose
Independent claim 25 recites a syringe-attachable hub assembly comprising a retraction tube, a hub, and a frame member connecting them, wherein the hub assembly is rotatable in at least one direction through a defined arc relative to the nose.
Needle retractable into the retraction tube by rotation
Independent claim 25 recites a needle retraction mechanism seated inside the nose and a forward-projecting needle selectively retractable into the retraction tube by rotating the syringe and hub assembly relative to the nose about an offset longitudinal axis.
The claims cover a syringe-attachable hub assembly connected to a laterally offset retraction tube and a nose carrying a needle mechanism, enabling needle retraction into the tube via relative rotation about an offset axis.
Stated Advantages
The design supports conventional luer-lock syringes.
The design avoids activation by axial force on the plunger.
Documented Applications
The medical device is selectively attachable to a syringe and is described for retracting a needle directly from a patient during an injection.
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