Patent US2343325A successfully refreshed from Google Patents.
US4367738A
Expired / Lapsed
US
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Pre-filled syringe for abusable drugs
Assignee: Janssen Pharmaceuticals Inc
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Filing: 1981-10-28
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Granted: 1983-01-11
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Expires: 2001-10-28
Abstract
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.
Inventors
- 👤 Robert Legendre
- 👤 Steven Schlossberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:25
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/50; A61M5/5013; A61M2005/5006; A61M5/502
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
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.
Claim 2
Dependent Claim
151 words
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.
Claim 3
Dependent Claim
19 words
The syringe of claim 1 which further comprises a hypodermic needle attached to the second end of the barrel.
Claim 4
Dependent Claim
21 words
The syringe of claim 1 wherein the fluid to be injected is a pharmaceutically acceptable injectable formulation containing fentanyl or morphine.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |