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US 2008/0171969 A1Published application
Syringe
AssigneeId Tech
InventorsPhillip Owen Byrne, Harry Raymond Ingham, Penelope Rosemary Attridge
Life of this patent
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Abstract
A disposable syringe (2) is disclosed. Withdrawal of a plunger handle (18) in the direction of arrow B to fill the syringe causes a moveable safety bobbin (20) to lock, and shaft (16) slides in the direction of arrow B relative to safety bobbin (20) and washer (22). Subsequent depression of plunger handle (18) in the direction of arrow A causes safety bobbin (20) to move along barrel (4), from which position it can not be withdrawn. This therefore prevents subsequent withdrawal of piston (14) and therefore prevents re-use of the syringe.
Claims17
A syringe comprising:
- (a) a barrel having a cylindrical interior surface substantially free of discontinuities over its usable extent;
- (b) a plunger including a plunger head and a shaft;
- (c) a restrictor bobbin movable with respect both to the barrel and the shaft to permit the drawing up and delivery of a fluid over the usable extent of the barrel, whilst limiting further use of the syringe;
- (d) the restrictor bobbin and/or shaft together comprising one or more members which are freely movable with respect to each other over a limited distance which is smaller that the usable extent of the barrel so as to permit repeated distal and proximal cycles of movement of the plunger head over the said limited distance.
1 more element
Dependencies are inferred from the claim text.