Retractable safety syringe
US8535266B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2009 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Feb 25, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3242
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A retractable safety syringe may have a ferrule and needle which are selectively removeable from a distal end of a syringe body. In particular, the ferrule may have an annular flange. A wedge element may be frictionally engaged to the ferrule and a distal end of the syringe body. To retract the needle into the syringe body, a punch of a piston displaces the wedge element off of an annular flange of the ferrule. At about the same time, longitudinally offset tabs engage an annular flange and retract the needle into the syringe body via a retraction force created by a variable vacuum compartment or tension member.Alternatively, the ferrule and needle may be temporarily fixed to the distal end of the syringe body via a detent and/or o-ring which engages a lower undercut groove and an upper undercut groove of the ferrule. An annular ring of the piston may have longitudinal offset tabs which engage an annular ring of the ferrule. Upon engagement, the retraction force of the variable vacuum compartment is sufficient to overcome any retaining forces created by the detent and/or the o-ring. Thereby, the needle and ferrule may be retracted into the syringe body.The longitudinal offset tabs m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.