Syringe assembly
US4923447A · kind A · utility
Inventor
Key dates
| Filing date | Feb 17, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Feb 17, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/3272
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A syringe assembly comprises an elongated tubular syringe barrel having a tubular needled mounted to one end and a plunger slidably disposed within the barrel. A hollow outer casing is mounted to and surrounds the syringe barrel with the barrel and the casing defining an interior space therebetween. A tubular sleeve is telescopically disposed within the space between the casing and barrel and is movable between an extended position surrounding and shielding the syringe needle and a retracted position in which the needle is exposed for use. A longitudinal slot is formed in the casing and a projection mounted to the sleeve is slidably disposed within the slot to function as a lever for moving the sleeve between its extended and retracted positions. Notches are formed on either end of the slot such that the projection can be moved laterally into a notch to lock the sleeve in either its extended or its retracted position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.