Automatic safety syringe
US6673044B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 9, 2002 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Sep 9, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3235
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A disposable syringe (100) comprises an internally hollow syringe body (1) open at the front and rear, a plunger (40) slidable inside the syringe body (1) and provided at the rear with a shaft (50) operated manually through the rear end (80) thereof, an injection needle (10) integral with a needle carrier (11), a supporting body (20), accommodating the needle carrier (11) in a removable manner and engaging with the fore end (2) of the syringe body (1), a spring (30) disposed under compression between the needle carrier (11) and the supporting body (20), a diaphragm (62) removably mounted in the shaft head (51) to cover a shaft inner chamber and an opening (60) in the shaft head (51) cooperating with tongues (13) in the needle carrier (11) to cause disengagement of the needle carrier from the supporting body (20), when the plunger (40) reaches an injection stroke end, so that the spring (30), expanding, retract the needle carrier (11) which abuts against the diaphragm (62) causing disengagement or rupture thereof to allow the needle carrier (11) to enter the shaft body chamber, bringing the needle (10) into a safety position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.