Disposable safety syringe
US6319234A · kind A · utility
Inventors
Key dates
| Filing date | Sep 8, 1999 |
| Grant date | Nov 20, 2001 |
| Priority date | — |
| Expiry date | Sep 8, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3264
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The syringe is provided with a needle-covering sleeve (14), which is slidably fitted on the syringe barrel (1) and is held in its retracted rest position by means of retaining tongues (10), which hook its rear rim (13). At the end of the injection stroke of the plunger (2), a rear head (8) of the stem (3) of the plunger (2) radially opens the retaining tongues (10) apart, which release thereby the needle-covering sleeve (14). Then, the latter is axially advanced by a spring (16), until it entirely covers the needle (5). The needle-carrier (4, 104) has at least one lateral locking projection (28), slidably engaging in a longitudinal slot (18), which is formed in the needle-covering sleeve (14) and is delimited at its sides, at least in its progressively tapering rear end (118), by two convergent and elastically openable stop sticks (19) which allow the passage of the locking projection (28) between their free ends, but then point against it and fasten it to the needle-covering sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.