Patent ID: 8303540
Filing Date: 2012-11-06
Classification: A61M

Abstract:
1. A disposable syringe comprising: a barrel having a surrounding barrel wall which surrounds an axis in an axial direction, and which defines a passage therein, said passage having rearward and forward openings which are disposed opposite to each other in the axial direction, said surrounding barrel wall including a larger-diameter portion and a smaller-diameter portion which are disposed proximate to said rearward and forward openings, respectively, and a first shoulder abutment which is disposed on said smaller-diameter portion and which confronts rearwardly; a bushing unit which is disposed on said larger-diameter portion, and which includes front and rear bushing members that are respectively proximate to and distal from said first shoulder abutment, and that extend towards each other to terminate at front and rear retaining segments, respectively; a needle cannula which extends along the axis and which has a fixed segment that extends in said passage to terminate at a communicating end, and a tip end extending forwardly of said forward opening; a tubular grip unit including a tubular needle seat including a front hub portion which is disposed to fix said needle cannula therein and which has a front end wall that confronts said first shoulder abutment, and a rear gripped portion extending from said front hub portion in the axial direction to terminate at an embedded end, said rear gripped portion being inserted into said front bore, and being in frictional engagement with said front inner surrounding grip surface; a shield plug member which is made from a material different from that of said tubular needle seat, and which is inserted into said rear bore, said shield plug member including a tubular plunger which is disposed to be movable along said passage in said bushing unit, said plunger including