Patent ID: 8652094

Claim:
Syringe ( 20 ) defining a reservoir ( 21 ) for containing a liquid and comprising an end-piece ( 10 ) having a longitudinal axis A, the said end-piece ( 10 ) encompassing a channel ( 11 ) aligned with the said longitudinal axis A and providing a passageway for the transfer of the said liquid, characterized in that the said channel ( 11 ) comprises at least two portions, a first portion ( 12 ) and a second portion ( 13 ), the said first portion ( 12 ) extending from a free distal end ( 14 ) of the end-piece ( 10 ) in the direction of the reservoir ( 21 ), and the said second portion ( 13 ) extending between the first portion ( 12 ) of the channel ( 11 ) and a proximal end of the end-piece ( 10 ) and connecting the said first portion ( 12 ) to the reservoir ( 21 ), the said first portion ( 12 ) having an average diameter that is greater than the average diameter of the said second portion ( 13 ), each of said first and second portions having the shape of a cylinder, a proximalmost diameter of said first portion ( 12 ) being greater than a distalmost diameter of said second portion ( 13 ), a transition zone ( 16 ) being defined between, and connecting, said first and second portions ( 12 , 13 ), said transition zone ( 16 ) including a distally-facing wall, having a length greater than 0, extending between said proximalmost diameter of said first portion ( 12 ) and said distalmost diameter of said second portion ( 13 ), said distally-facing wall protrudes radially-inwardly with a change in diameter from said proximalmost diameter of said first portion ( 12 ) to said distalmost diameter of said second portion ( 13 ) so as to define a step between said first portion ( 12 ) and said second portion ( 13 ), said change in diameter of said distally-facing wall over the length of said distally-facing wall being greater than a change in diameter over a length of said second portion equal to a length of said distally-facing wall adjacent to said distally-facing wall, wherein, said first portion, said transition zone and said second portion are open to define said passageway for the transfer of said liquid between the reservoir and the free distal end of the end-piece, wherein the syringe and the end-piece are made in a single piece out of glass.