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US3603310A Expired / Lapsed US ⏱️ 0.0 years remaining

Disposable syringe

Assignee: Parke Davis and Co LLC
•
Filing: 1969-06-30
•
Granted: 1971-09-07
•
Expires: 1989-06-30
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Abstract

Abstract A dispensing syringe is provided having a liquid-fill compartment between an inner piston and an outer piston. In storage the inner piston is partly pierced by the inner end of a two-way syringe cannula and serves to divide the syringe barrel in two parts: one, a head space and the other the mentioned compartment separate from the syringe cannula. To avoid changes of pressure in the head space the hub has a bypass structure for venting. The syringe is operable by reciprocation to bring the liquid-fill in direct communication with the syringe cannula for mixing purposes, aspiration and injection by conventional techniques. The syringe components are standardized for use with conventional dispensing components such as vials, needle covers, etc. The head space has a closure hub on the free end thereof, the hub having a gasket in the form of a disc having a radial channel therein so that the head space may be vented to atmosphere in storage or when the inner piston is moved toward the hub for bringing the liquid-fill into communication with the cannula as noted.

Inventors

  • 👤 Ralph E Mottin
  • 👤 Carl C Garland

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 14:56
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/19; A61M5/31

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 209 words
A syringe comprising in combination a cylindrical syringe barrel, an outer piston and a pierceable inner piston, the pistons being adapted to be spaced apart in the barrel to define with the barrel a liquid-fill zone therein and being further adapted to be moved axially within the barrel in fluidtight contact therewith, a cannula having an inner end extending axially within the barrel and an outer end for ejecting fluid from the fill zone, the inner piston being positioned in sealing relation with respect to the inner end of the cannula and adapted to be axially moved from the sealing position to a dispensing position exposing the inner end of the cannula to the fill zone, the cannula having an opening in the inner end thereof, the cannula, barrel and inner piston defining a variable head space within the barrel, and means for mounting the cannula on the barrel, the mounting means being adapted for venting the head space independent of the cannula opening, the mounting means including a hub secured to the syringe by meaNs comprising a bypass providing the venting to the atmosphere from the head space said mounting means including gasket means within said hub, the gasket means providing channel means for providing said bypass means.
Claim 2
Dependent Claim 209 words
A syringe comprising in combination a cylindrical syringe barrel, an outer piston and a pierceable inner piston, the pistons being adapted to be spaced apart in the barrel to define with the barrel a liquid-fill zone therein and being further adapted to be moved axially within the barrel in fluidtight contact therewith, a cannula having an inner end extending axially within the barrel and an outer end for ejecting fluid from the fill zone, the inner piston being positioned in sealing relation with respect to the inner end of the cannula and adapted to be axially moved from the sealing position to a dispensing position exposing the inner end of the cannula to the fill zone, the cannula having an opening in the inner end thereof, the cannula, barrel and inner piston defining a variable head space within the barrel, and means for mounting the cannula on the barrel, the mounting means being adapted for venting the head space independent of the cannula opening, the mounting means including a hub secured to the syringe by meaNs comprising a bypass providing the venting to the atmosphere from the head space said mounting means including gasket means within said hub, the gasket means providing channel means for providing said bypass means.
Claim 3
Dependent Claim 24 words
A syringe according to claim 1 wherein the inner piston is spaced from the outer piston, the zone between the pistons including a liquid-fill.
Claim 4
Dependent Claim 28 words
A syringe according to claim 1 wherein the inner piston is axially movable from the sealing position to a dispensing position exposing the inner end of the cannula.
Claim 5
Dependent Claim 26 words
A syringe according to claim 2 wherein the inner piston is movable by axial pressure on the liquid-fill in the fill zone by the outer piston.

References Cited (Backward Citations)

US2735428A Cited
US1596004A Cited
US2460039A Cited
US2607341A Cited
US2826196A Cited
US2893390A Cited
FR1252251A Cited
US3115137A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-09-06 1975-03-08 1975-09-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-09-06 1979-03-08 1979-09-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-09-06 1983-03-08 1983-09-07 $7700.00 Window Closed / Lapsed

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