Single use syringe and plunger rod locking device therefor
AssigneeBecton, Dickinson and Company
InventorsSteven Choon Meng Lau, Chui Khim Chua, Ya Han Moh
Life of this patent
Estimating the term…
Abstract
A single use syringe assembly is provided as well as a locking element for such an assembly. The single use syringe assembly includes a barrel, a plunger rod assembly and a locking element positioned within the barrel. The locking element includes one or more barbs for engaging the inside surface of the barrel. The barbs prevent the locking element from moving proximally within the barrel, but allow its distal movement therein with the plunger rod assembly. A spring member may be provided for urging the barbs towards the inside surface of the barrel. The barbs are preferably positioned on the edge portions of opposing legs that form part of the locking element.
Claims23
A locking element for a single use syringe, comprising:
- a base including a generally trough-shaped body having a longitudinal axis;
- a first leg extending from said base substantially parallel to said longitudinal axis;
- a second leg extending from said base substantially parallel to said longitudinal axis, said second leg being in opposing relation to said first leg;
- a first barb extending from said first leg;
- a second barb extending from said second leg;
- said first leg including a first end portion extending generally towards said longitudinal axis;
- said second leg including a second end portion extending generally towards said longitudinal axis, and
- a spring element for urging said barbs in a selected direction, said spring element attached to said base.
A single use syringe assembly comprising:
- a barrel having an inside surface defining a chamber for retaining fluid, and open proximal end and a distal end having a passageway in communication with said chamber;
- a plunger rod assembly including an elongate body portion having a proximal end, a distal end, and a stopper mounted to said elongate body portion proximate said distal end, said stopper being slidably positioned in substantially fluid tight engagement with said inside surface of said barrel, said elongate body portion extending outwardly from said open proximal end of said barrel;
- and
- a generally trough-shaped locking element positioned within said barrel, said locking element defining a channel, said elongate body portion of said plunger rod assembly extending through said channel;
- one or more barbs extending from said locking element, said one or more barbs engaging said inside surface of said barrel for substantially preventing said locking element from moving proximally with respect to said barrel but allowing movement of said locking element towards said distal end;
- said locking element engaging said elongate body portion of said plunger rod assembly such that said locking element is movable towards said distal end of said barrel as said plunger rod assembly is advanced, and
- a spring member attached to said locking element and urging said one or more barbs towards said inside surface of said barrel.
A single use syringe assembly comprising:
- a barrel having an inside surface defining a chamber for retaining fluid;
- a plunger rod assembly including an elongate body portion having a proximal end, a distal end and a stopper mounted to said elongate body portion, said stopper being slidably positioned in substantially fluid tight engagement with said inside surface of said barrel, said elongate body portion extending outwardly from said barrel;
- a locking element positioned within said barrel, said locking element including a base including first and second opposing walls and a third wall connecting said first and second walls, a first leg extending proximally from said first wall, a second leg extending proximally from said second wall, said first and second legs being in opposing relation, a first barb extending from said first leg and engaging said inside surface of said barrel, a second barb extending from said second leg and engaging said inside surface of said barrel, said first leg including a first end portion engageable with said elongate body portion of said plunger rod assembly, said second leg including a second end portion engageable with said elongate body portion of said plunger rod assembly, said first and second barbs being positioned to substantially prevent said locking element from moving proximally in said barrel, but allowing said locking element to move distally within said barrel.
Dependencies are inferred from the claim text.