US5782803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low dead space, interchangeable needle syringe
Assignee: Saf T Med Inc
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Filing: 1996-11-26
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Granted: 1998-07-21
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Expires: 2016-11-26
Abstract
Abstract A non-reusable syringe is provided which has an interchangeable needle, and, further, which has very low residual medication in the syringe after use. Devices for achieving the interchangeable needles while maintaining low residual medication are disclosed.
Inventors
- 👤 S. William Jentzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:48
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/32; A61M5/315; A61M5/31511; A61M5/34; A61M5/347; A61M2005/31516
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
267 words
A low dead space safety syringe, comprising: (a) a cylindrical barrel including first and second ends, and comprising a first internal diameter wall of a given diameter and a second internal wall having an internal diameter smaller than the diameter of the first internal diameter wall, said second internal diameter wall having an end protruding distally away from the distal end of the first internal diameter wall and terminating at the second barrel end; (b) a nozzle section on said barrel and including nozzle dead space; (c) a chamber for receipt of medicinal fluid within said barrel and said nozzle section and between said first and second barrel ends; (d) a plunger extendable into said barrel through the first end of said barrel, said plunger having distal and proximal ends, said plunger being selectively moveable from an expanded position to an expended position; (e) a hollow needle assembly selectively securable to the barrel and around the nozzle section; and (f) dead space sealing means including an elastomeric sealing member engaged with the plunger immediate the distal end of the plunger for slidable sealing contact with at least one of the first and second internal diameter walls of said barrel, said sealing means further including an elongated nose tip portion slidable along and extending distally through the second internal wall of the barrel, whereby, when said plunger is moved to said expended position said sealing means extends through said barrel and said nozzle section and to the second barrel end to eject the medicinal fluid within said nozzle dead space out of said chamber and said nozzle section.
Claim 2
Dependent Claim
267 words
A low dead space safety syringe, comprising: (a) a cylindrical barrel including first and second ends, and comprising a first internal diameter wall of a given diameter and a second internal wall having an internal diameter smaller than the diameter of the first internal diameter wall, said second internal diameter wall having an end protruding distally away from the distal end of the first internal diameter wall and terminating at the second barrel end; (b) a nozzle section on said barrel and including nozzle dead space; (c) a chamber for receipt of medicinal fluid within said barrel and said nozzle section and between said first and second barrel ends; (d) a plunger extendable into said barrel through the first end of said barrel, said plunger having distal and proximal ends, said plunger being selectively moveable from an expanded position to an expended position; (e) a hollow needle assembly selectively securable to the barrel and around the nozzle section; and (f) dead space sealing means including an elastomeric sealing member engaged with the plunger immediate the distal end of the plunger for slidable sealing contact with at least one of the first and second internal diameter walls of said barrel, said sealing means further including an elongated nose tip portion slidable along and extending distally through the second internal wall of the barrel, whereby, when said plunger is moved to said expended position said sealing means extends through said barrel and said nozzle section and to the second barrel end to eject the medicinal fluid within said nozzle dead space out of said chamber and said nozzle section.
Claim 3
Dependent Claim
28 words
The syringe of claim 1 further comprising means for selectively securing a hollow needle assembly to the barrel immediate and internal of the second end of said barrel.
Claim 4
Dependent Claim
56 words
The syringe of claim 1 wherein at least one fluid flow channel is defined on the exterior of the elongated nose tip portion of the dead space sealing means for transmission of fluid out of the chamber and the nozzle section dead space when the plunger is moved from the expanded position to the expended position.
Claim 5
Dependent Claim
65 words
The syringe of claim 1 wherein fluid flow channel means are defined on the exterior of the elongated nose tip portion for transmission of fluid out of the chamber and the nozzle section dead space when the plunger is moved between the expanded position and the expended position, said fluid flow channel means including a series of radially spaced horizontal and intersecting vertical channel members.
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) | 2001-07-20 | 2002-01-19 | 2002-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-20 | 2006-01-19 | 2006-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-20 | 2010-01-19 | 2010-07-21 | $7700.00 | Window Closed / Lapsed |