Title: Fluid dispensing arrangement

Abstract: A fluid dispensing arrangement for injecting liquid parenteral drugs or other liquids, including a syringe or cartridge with a needle-hub secured thereto, a plunger in the syringe or cartridge for effecting liquid discharge and injection, and a combination sealing and by-pass valve plug initially in a radially compressed sealing position at the forward end of the cartridge or syringe body or barrel and separating the liquid in the cartridge or syringe body or barrel from the needle-hub assembly, the valve plug being longitudinally forwardly movable to a by-pass discharge position within a by-pass chamber of larger diameter than the normal unrestricted and uncompressed diameter of the plug. The plug has tapered cruciform ends with corresponding circumferentially spaced by-pass grooves formed thereby at its opposite ends to aid in liquid by-pass therepast during liquid discharge or aspirating action.

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Inventors: Baldwin, Brian E. (Wilmette, IL, US)

Application Number: 515966
Filing Date: 1974-10-18
Publication_date: 1976-03-02
Assignee: Affiliated Hospital Products, Inc. (St. Louis, MO)
Primary Class(es): 604/238 604/199
Other Classes:
US Patent Ref:

2538662	Jan, 1951	Abbott	128/218.
2607341	Aug, 1952	Brown	128/218.
2610628	Sep, 1952	Lockhart	128/272.
2893390	Jul, 1959	Lockhart	128/218.
3075525	Jan, 1963	McConnaughey	128/218.
3076456	Feb, 1963	Hun, Sr.	128/218.
3102539	Sep, 1963	Goldberg	128/218.
3136440	Jun, 1964	Krug et al.	128/DIG.
3207374	Sep, 1965	Holmes et al.	128/272.
3330282	Jul, 1967	Visser et al.	128/218.
3373743	Mar, 1968	Saffir	128/218.
3397694	Aug, 1968	Ogle	128/218.
3467097	Sep, 1969	Ogle	128/DIG.
3674028	Jul, 1972	Ogle	128/DIG.

Other Refs:
Primary Examiner: Yasko, John D.
Assistant Examiner:
Attorney: Pippin, Jr.; Reginald F.