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US 4,367,738 AGranted
Pre-filled syringe for abusable drugs
AssigneeJanssen Pharmaceutica NV
InventorsRobert Legendre, Steven Schlossberg
Life of this patent
Estimating the term…
Abstract
A pre-filled syringe suitable for administration of abusable injectable drugs which prevents surreptitious injection of the drug and replacement by an adulterant to avoid detection of the abuse.
Claims3
A disposable, non-reusable, pre-filled syringe comprising:
- (a) a barrel having a first open end having a restricted opening and a second end adapted to receive a hypodermic needle;
- (b) a piston assembly within said barrel comprising a piston and plunger rod attached to the piston and extending out through the restricted opening of the first open end of the barrel, said plunger rod having a plurality of short, stiff, flexible spikes attached thereto at an oblique angle away from the piston;
- and
- (c) a fluid to be injected contained within said barrel between said piston and said second end of the barrel,
- whereby a push on the plunger rod will inject the fluid through the hypodermic needle since the oblique-angled;
- spikes will contract to pass through the restricted opening, while a pull on the plunger rod will be resisted by the oblique-angled spikes, thus preventing aspiration of fluid into the barrel.
3 more elements
Dependencies are inferred from the claim text.