US4995874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable syringe device
Assignee: Individual
•
Filing: 1989-06-23
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Granted: 1991-02-26
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Expires: 2009-06-23
Abstract
Abstract A disposable syringe having a needle which may be easily withdrawn to safety after use is disclosed. The syringe includes a cylinder and plunger in which a threaded extension or threadlock on the forward end of the plunger is capable of engaging a threadbore element positioned within the forward neck portion of the cylinder after the injectable fluid has been expelled from the cylinder. The threadbore element is secured to the needle. Rotation of the plunger causes the threadlock to engage the threadbore and the needle may be withdrawn into the interior of the cylinder by pulling the plunger rearwardly.
Inventors
- 👤 H. Allen Strickland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:16
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/32; A61M5/3205; A61M5/321; A61M5/322
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A disposable syringe device having a retractable needle, comprising: a cylinder member having a neck portion at one end thereof; a plunger mounted for reciprocal movement within said cylinder, said plunger having a threaded portion at one end; a threadbore member mounted within said neck portion in fluid tight engagement therewith, said threadbore member having an inner bore with a threaded portion in said bore for receiving the threaded portion of said plunger; a tapered post member mounted on one end of said threadbore member outwardly of said cylinder, said post member having said needle mounted therein; and a gasket mounted about the circumference of said threadbore member to provide fluid tight engagement between the threadbore member and the neck portion of said cylinder.
Claim 2
Dependent Claim
124 words
A disposable syringe device having a retractable needle, comprising: a cylinder member having a neck portion at one end thereof; a plunger mounted for reciprocal movement within said cylinder, said plunger having a threaded portion at one end; a threadbore member mounted within said neck portion in fluid tight engagement therewith, said threadbore member having an inner bore with a threaded portion in said bore for receiving the threaded portion of said plunger; a tapered post member mounted on one end of said threadbore member outwardly of said cylinder, said post member having said needle mounted therein; and a gasket mounted about the circumference of said threadbore member to provide fluid tight engagement between the threadbore member and the neck portion of said cylinder.
Claim 3
Dependent Claim
22 words
The syringe device of claim 1 wherein said plunger has a piston member mounted on the threaded end portion of said plunger.
Claim 4
Dependent Claim
23 words
The syringe device of claim 1 wherein said threadbore member has a tapered hub portion on one end for receiving said post member.
Claim 5
Dependent Claim
70 words
The syringe device of claim 1 wherein said gasket is of a size and material so as to allow the threaded end portion of said plunger to press against and engage the threadbore upon forward movement of said plunger without having the gasket pass through the cylinder neck portion and wherein the threadbore member with attached gasket may be withdrawn through said cylinder neck upon rearward movement of said plunger.
Claim 6
Dependent Claim
36 words
The syringe device of claim 5 wherein the cylinder neck has a rolled forward edge producing a slightly smaller diameter at the extreme forward end of the cylinder neck to prevent forward movement of the gasket.
Claim 7
Dependent Claim
23 words
The syringe device of claim 2 wherein said threaded end portion of the plunger is of reduced diameter relative to the piston member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |