EP0388137A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Simplified retractable needle syringe
Assignee: Individual
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Filing: 1990-03-13
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Granted: —
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Expires: 2010-03-13
Abstract
Abstract A simplified retractable needle hypodermic syringe is provided which includes a barrel (10) having a needle carrier (20) mounted therein with a cannula (90) attached thereto. A slidable plunger (50) is mounted within the barrel (10) which includes a shaft (80) and hub (81) for locking to the carrier (20) by engagement in an enlarged bore (23) in the carrier. A plunger seal (60) is conveniently mounted about the shaft (80) between the plunger (50) and the hub (81). The shaft (80) may be shearable above the hub (81) to allow the hub to be broken off and left in the carrier (20) after use.
Inventors
- 👤 Michael Lynn Haining
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 01:34
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/32; A61M5/3205; A61M5/321; A61M5/322; A61M5/3221; A61M2005/3231; A61M5/50; A61M5/5066; A61M2005/5073
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
176 words
A hypodermic syringe having a retractable needle, comprising: a hollow cylindrical barrel open at both ends and having an inwardly projecting lip at the lower end and finger flanges at the upper end; a needle carrier mounted within said barrel and seated on said lip solely in frictional sealing engagement with the inner wall of said barrel, said needle carrier having an extension protruding through the opening at the lower end of said barrel; a hypodermic needle mounted on said extension; a plunger slidably mounted in said barrel through the upper open end and defining a fluid chamber between said carrier and said plunger; a central bore through said carrier and extension for fluid communication between said needle and said chamber; an enlarged bore in said carrier near said chamber and coaxial with said central bore; a shaft extending from the lower end of said plunger; a hub on the lower end of said shaft adapted to lock into said enlarged bore; and a seal member secured about said shaft between said plunger and said hub.
Claim 2
Dependent Claim
176 words
A hypodermic syringe having a retractable needle, comprising: a hollow cylindrical barrel open at both ends and having an inwardly projecting lip at the lower end and finger flanges at the upper end; a needle carrier mounted within said barrel and seated on said lip solely in frictional sealing engagement with the inner wall of said barrel, said needle carrier having an extension protruding through the opening at the lower end of said barrel; a hypodermic needle mounted on said extension; a plunger slidably mounted in said barrel through the upper open end and defining a fluid chamber between said carrier and said plunger; a central bore through said carrier and extension for fluid communication between said needle and said chamber; an enlarged bore in said carrier near said chamber and coaxial with said central bore; a shaft extending from the lower end of said plunger; a hub on the lower end of said shaft adapted to lock into said enlarged bore; and a seal member secured about said shaft between said plunger and said hub.
Claim 3
Dependent Claim
29 words
The hypodermic syringe of claim 1 wherein said shaft is shearable above said hub to allow said hub to be broken off and left in said bore after use.
References Cited (Backward Citations)
No citation records indexed.
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