Patent ID: 7226431
Filing Date: 2007-06-05
Classification: A61M

Abstract:
1. A disposable syringe incapable of re-use regardless of the user's intent comprising: a barrel in the shape of a hollow cylinder, having its upper end open and equipped on the outside with finger gripping devices positioned and shaped to be gripped with two fingers for better handling, and terminated at its lower end with a needle cap holding a medical injection needle; a lower seal of cylindrical annular shape made of rubbery material, having its external cylindrical surface forming an air-tight fit with inner wall of said barrel, and having its internal cylindrical surface forming a liquid-tight slip fit with said stem extension, and furthermore having its upper surface conform to lower surface of said spider thereby forming when said spider and said lower seal are in contact, a liquid-tight combination henceforth called lower liquid-tight combination; and an upper seal of cylindrical annular shape made of rubbery material, having its external cylindrical surface forming an air-tight fit with inner wall of said barrel, and having its internal diameter larger than said stem, thereby forming a gap between said upper seal and said stem, said gap allowing fluid to circulate freely, and furthermore having its lower surface conform to upper surface of said spider, thereby, forming when said spider and said upper seal are in contact, an air tight combination henceforth called upper air-tight combination;