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1. IN3601/DEL/2012 - SELF-RETRACTABLE SAFETY (SRS) SYRINGE FOR SINGLE USE

Office
India
Application Number 3601/DEL/2012
Application Date 23.11.2012
Publication Number 3601/DEL/2012
Publication Date 15.08.2014
Publication Kind A
IPC
A61B
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
Applicants PRATIBHA
BHARATI
JAI HIND
NEELAM RATHORE
Inventors PRATIBHA
BHARATI
JAI HIND
NEELAM RATHORE
Title
(EN) SELF-RETRACTABLE SAFETY (SRS) SYRINGE FOR SINGLE USE
Abstract
(EN)
The present subject matter relates to self-retractable safety syringe 100 for single usecomprising a plunger assembly including a plunger barrel 102 and a plunger plug 103, a needlecarrier assembly 114, and an outermost barrel 108. The plunger plug 103 holding a centrallypositioned furrowed axial knob 134 housed in plunger barrel 102 at the proximal end and firmlyheld by the inner teeth T-2 & T-4 of finger locks 126 and 128 respectively. A needle carrierassembly 114 is housed tn conical jacket of outermost barrel 108 holding a needle 110 alongwith a compressed spring 184. The needle is locked inside the needle carrier assembly with thehelp of finger lock 166 provided with outwardly protruded !lange 168. The flange 168 is placedin contact \vith a slidable elastic O-ring 182 holding the needle carrier assembly inside theconical jacket. At the completion of injection process, the furrowed knob inserts into the distalcavity of needle 110 to lock the needle with plug. Whcn the clastic O-ring slides in forwarddirection due to the axial movement of plunger barrel in forward direction, the G-ring pushes theflange 168 of finger lock 166, to unlock thc lock. At the same timc. the teeth outer T-I & T-3 ofthe finger locks 126 & 128 respectively become in alignment of inner circumferential conicalgroove 148 of outermost barrel 108 and restore their normal state by expanding in outwarddirection to occupy the outer space provided by the groove 148. This result the respective innerteeth T-2 & T-4 of the finger locks 126 & 128 to retract and release the plunger plug 103 due toexpansion of locks in outward direction. Consequently, the plunger plug 103 holding the needle110 moves smoothly in backward direction due to the pressure exerted by expansion of spring184 in backw"ard direction. Simultaneously. the finger lock 124 provided at the distal end ofplunger barrel 102 slips into the inner circumferential conical groove 146 and click locks theplunger barrel 102 inside the outermost barrel 108 to render the syringe assembly completelylocked \vith the needle encapsulated within the plunger barreL The distally directing, outwardlyprotruded finger locks 125 and 127 provided at the proximal end of plunger barrel prevent theremoval of plunger barrel 102 from the outermost barrel 108.REFER FIG. 5

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