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1. WO2014072994 - FOLDED PLUNGER AUTO RETRACTABLE SYRINGE FOR SINGLE USE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]


We An auto retractable safety syringe 100 for single use a folded plunger assembly 200 for slidably inserting in an outermost barrel 1 the folded plunger assembly 200 an inner plunger barrel 102 provided with at least one oppositely positioned circumferential 122 on outer surface at its proximal end a pair of oppositely positioned finger locks and on either end to get engaged with an outermost barrel 110 and the outer plunger barrel 104 a piston seal holder 114 structured at the proximal end P for holding a piston seal the outer plunger barrel 104 comprising a second piston seal holder 124 at proximal end P for holding another piston seal wherein the outer plunger barrel 104 comprising at least one pair of oppositely positioned finger locks and on either ends the finger lock and directing to the distal as well as proximal ends having thickness almost double to that of the walls of plunger barrel the finger lock 156 being protruded inwardly in normal state and having a conical tooth the proximal surface of tooth is designed perpendicular to the inner surface of barrel whereas the distal surface is obliquely inclined to the proximal finally constituting an oblique notch the finger lock 158 protruded outwardly in normal state and having tooth at the outer and inner surfaces wherein the half of the proximal portion of the outwardly protruded tooth is obliquely inclined to the distal whereas the distal portion of tooth is perpendicular to the outer surface of barrel finally constituting an outwardly protruded oblique the proximal as well as distal surfaces of tooth are parallel to each other as well as perpendicular to the outer surface of barrel a plunger plug 106 designed with atleast one uniform circumferential groove 136 wherein the plunger plug 106 is centrally designed with a longitudinally furrowed knob 140 at its proximal end a needle carrier assembly 108 for housing in the outermost barrel the needle carrier assembly 108 a seat and internal locking arrangement 148 provided in a central axial passage opening designed in a cavity 146 at the distal end D to snap lock the furrowed knob 140 present in the plunger plug a needle 152 provided with a needle cover 154 at the proximal end P of the needle carrier assembly elastic 132 to support and hold the needle carrier assembly 108 inside the outermost barrel and to dislodge the assembly on completion of the outermost barrel 1 10 designed to receive the folded plunger assembly 200 after getting in the needle carrier assembly wherein the outermost barrel 110 is provided with a finger rest a uniform inner circumferential conical groove 130 and a conical jacket opening 134 at the proximal end of the outermost barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the inner diameter of the outermost barrel 110 is uniformly equal to the outer diameter of the outer plunger barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the inner plunger barrel 102 is designed with a thumb rest 112 at its distal end The auto retractable safety syringe 100 for single use as claimed in preceding wherein the finger lock 156 comprises teeth and obliquely inclined to the distal end D of the outermost barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the finger lock 158 comprises teeth T3 obliquely inclined to the proximal end P of the outermost barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the outer diameter of the outer plunger barrel 104 is uniformly equal to the inner diameter of the outermost barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the outer plunger barrel 104 comprises of a finger rest 128 at the distal end The auto retractable safety syringe 100 for single use as claimed in preceding wherein the outer diameter of the plunger plug 106 is equal to the inner diameter of the outer plunger barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the inner diameter and thickness of the elastic 132 is equal to the outer diameter and thickness of the distal portion of the needle carrier The auto retractable safety syringe 100 for single use as claimed in preceding wherein the outermost barrel 110 is designed to receive the needle carrier 154 and the folded plunger assembly 200 The auto retractable safety syringe 100 for single use as claimed in preceding wherein during insertion of the inner plunger barrel 102 in the outer plunger barrel the tooth of the finger lock 158 becomes in alignment of a flat portion provided between two oppositely positioned face to face circumferential conical 136 at the outer surface of the inner plunger barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the two inner circumferential conical grooves 122 includes a first conical groove designed at the inner surface of distal end D and a second conical groove designed at the inner surface of the proximal end The auto retractable safety syringe 100 for single use as claimed in preceding wherein during insertion of the folded plunger assembly 200 in the outermost barrel the tooth of finger lock 156 is positioned in the inner parallel grooves and provided at the distal end D of the outermost barrel The auto retractable safety syringe 110 for single use as claimed in preceding wherein the seating of tooth in the outer circumferential groove firmly held and control the movement of the plunger plug The auto retractable safety syringe 100 for single use as claimed in preceding wherein once the tooth of finger lock 156 occupies the seat in the groove the plunger assembly 200 is rotated in either direction by approximately 60 to 90 degrees to block the movement of the plunger assembly 200 inside the outermost barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein air is trapped between the plunger assembly 200 and the needle carrier assembly 108 on pushing the plunger barrel inside the outermost barrel 110 which prevents the knob 140 from The auto retractable safety syringe 100 for single use as claimed in preceding wherein the finger lock opens and snaps hold the walls of the inner and outer plunger barrel 110 firmly to unite and catch hold each other as a united plunger The auto retractable safety syringe 100 for single use as claimed in claim 1 wherein the needle 152 is also provided with a needle cover 154 which gets uncovered as the united plunger barrel is further pushed inside the outermost barrel The auto retractable safety syringe 100 for single use as claimed in preceding wherein the finger lock opens and snap locks in the inner circumferential groove 130 provided at the distal end D of the outermost barrel 110 resulting in complete lock of the plunger barrel inside the outermost barrel insufficientOCRQuality