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US5397313A Expired / Lapsed US ⏱️ 0.0 years remaining

Low friction syringe

Assignee: Becton Dickinson and Co
•
Filing: 1994-01-27
•
Granted: 1995-03-14
•
Expires: 2014-01-27
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Abstract

Abstract The invention features a low friction syringe which includes a plastic barrel having a circumferential inner surface defining a chamber, a plastic plunger having a distal end received in the barrel chamber, and an elastomeric gasket positioned at the distal end of the plunger and received in the barrel chamber. The gasket comprises a body with forward and rearward ends and first and second annular flanges positioned circumferentially at the forward and rearward ends of the body. The forward flange permits injection to occur. The rearward flange permits aspiration to occur. The flanges are separated by an annular space intermediate the body portion and the barrel inner surface. The gasket also includes an annular projection extending from each flange. Each projection is of reduced thickness relative to the thickness of each flange itself and provides a contact point with the barrel inner surface when the plunger distal end is received in the barrel chamber, thereby enabling reduced frictional contact with the barrel inner surface during forward and rearward movement of the gasket.

Inventors

  • 👤 James R. Gross

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 00:02
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31511; A61M5/31513; A61M2005/31521

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 154 words
A low friction syringe, comprising: a plastic barrel having a circumferential inner surface defining a chamber; a plastic plunger having a distal end received in the barrel chamber; and an elastomeric gasket positioned at the distal end of the plunger and receivable in the barrel chamber, the gasket comprising a body with forward and rearward ends and first and second annular flanges positioned circumferentially at the forward and rearward ends of the body, respectively, the flanges being separated by an annular space intermediate the body and the barrel inner surface, wherein the gasket further comprises an annular projection extending from each flange, each projection being of reduced thickness relative to the thickness of each flange and providing a contact point with the barrel inner surface when said plunger distal end is positioned in said barrel chamber, thereby enabling reduced frictional contact with said barrel inner surface during forward and rearward movement of said gasket.
Claim 2
Dependent Claim 154 words
A low friction syringe, comprising: a plastic barrel having a circumferential inner surface defining a chamber; a plastic plunger having a distal end received in the barrel chamber; and an elastomeric gasket positioned at the distal end of the plunger and receivable in the barrel chamber, the gasket comprising a body with forward and rearward ends and first and second annular flanges positioned circumferentially at the forward and rearward ends of the body, respectively, the flanges being separated by an annular space intermediate the body and the barrel inner surface, wherein the gasket further comprises an annular projection extending from each flange, each projection being of reduced thickness relative to the thickness of each flange and providing a contact point with the barrel inner surface when said plunger distal end is positioned in said barrel chamber, thereby enabling reduced frictional contact with said barrel inner surface during forward and rearward movement of said gasket.
Claim 3
Dependent Claim 41 words
The low friction syringe of claim 1 wherein each said projection is sufficiently flexible relative to the flanges to permit the flanges to contact the inner surface of the barrel during movement of the gasket forward or rearward in the barrel.
Claim 4
Dependent Claim 31 words
The low friction syringe of claim 2 wherein said projections are sufficiently rigid to prevent the flanges from contacting the inner surface of the barrel while the plunger is at rest.
Claim 5
Dependent Claim 15 words
The low friction syringe of claim 1, each said projection being substantially circular in cross-section.
Claim 6
Dependent Claim 15 words
The low friction syringe of claim 1, each said projection being substantially square in cross-section.
Claim 7
Dependent Claim 43 words
The low friction syringe of claim 2, said barrel chamber having a capacity for a given volume or air or liquid, wherein said forward and rearward annular projections are sufficiently flexible to permit injection or aspiration of said volume of air or liquid.

References Cited (Backward Citations)

US2886034A Cited
GB870669A Cited
US3135260A Cited
US3176595A Cited
US4266557A Cited
US4212309A Cited
US4405249A Cited
US4986820A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-03-13 1998-09-12 1999-03-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-03-13 2002-09-12 2003-03-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-03-13 2006-09-12 2007-03-14 $7700.00 Window Closed / Lapsed

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