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[Category : - HEALTH]
[Viewed 1606 times]

The present subject matter relates to a folded- plunger auto- retractable disposable syringe (100) which includes a needle carrier assembly (109) and a folded plunger assembly (111) for respectively inserting in an outermost barrel (106). The folded plunger assembly (111) is provided with at least one oppositely positioned circumferential C-groove (118) on the outer surface at its proximal end P constituting a ridge (130). The folded plunger assembly also includes at least one outwardly protruded finger lock (116) to get engaged with an outer plunger barrel (104), and a piston seal holder (112) structured at the proximal end P for holding a piston seal (114). The outer plunger barrel (104) includes at least two pair of oppositely positioned finger locks (128, 130 & 132, 134) wherein each pair of lock is diametrically aligned opposite to each other and positioned at the distal end of the barrel where two diameters of barrel bisect each other perpendicularly. The outer plunger barrel (104) is also provided with a second piston seal holder (120) at proximal end P for holdings second piston seal (122). The present subject matter also discusses about the needle carrier assembly (109) for housing in the outermost barrel 106 before inserting the folded plunger assembly (111). The needle carrier assembly (109) includes a hypodermic needle (107) provided with a needle seat (156) at its distal end to hold a needle (146) at the proximal end of the hypodermic needle (107). The needle carrier assembly (109) is further provided with a spring (148) surrounding the needle to (146) push the hypodermic needle (107) through the spring (148) and an axial (passage 164) present in a needle carrier hub (108). The needle carrier hub (108) is advantageously provided with three different diameters to firmly hold the needle seat (156). The present invention further explains that the outermost barrel (106) is designed to receive the folded plunger assembly (111) after getting in the needle carrier assembly (109), wherein the outermost barrel (106) is provided with a finger rest (136), two uniform obtuse-angled L-shaped inner circumferential conical groove (138 and 140) and a conical jacket opening (144) at the proximal end of the outermost barrel (106).

Priority Date : 08.11.2012 [3476/DEL/2012]
International filing : PCT/IN2013/000656 dated 29/10/2013
International Publication by WIPO : WO/2014/072994 on 15.05.2014
IPC classification : A61M

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