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Disposable syringe

  • US 5,275,582 A
  • Filed: 10/15/1992
  • Issued: 01/04/1994
  • Est. Priority Date: 10/22/1991
  • Status: Expired due to Fees
First Claim
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1. A disposable syringe comprisinga syringe cylinder having an inside peripheral surface, an open first end and a second end, an end wall at said second end, the end wall being provided with a hollow needle holder and being closed with the exception of the region adjacent to said needle holder,a syringe piston comprising a piston skirt that protrudes out of said open first end of said cylinder and is provided with a handle outside said cylinder, and a piston head disposed within said cylinder and facing said second end thereof, the piston head having an end face facing said second cylinder end and carrying a peripheral annular flange that is provided with an annular seal in sliding contact with said inside peripheral surface of said cylinder,said end wall of said cylinder having an inside surface which, except adjacent to said needle holder, conforms to said end face of said piston head,said flange having a frustoconical inside surface facing said first end of said cylinder and said piston skirt and a frustoconical outside surface facing said inside peripheral surface of said cylinder and said second end of said cylinder,said flange flaring toward said first end of said cylinder,said inside surface of said flange and said annular seal defining a peripheral annular space which is generally triangular in radial section,said end wall of said cylinder comprising a peripheral annular portion which is generally triangular in radial section and conforms to said annular space,said needle holder being eccentrically disposed with respect to said end wall and extending through said annular portion and opening into said annular space,the radical distance from said frustoconical inside surface to said piston skirt continuously increasing toward said second end of said cylinder, andsaid annular seal being cylindrical and being joined to, and coaxial with, said flange and freely protruding therefrom toward said end wall of said cylinder.

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