Safety syringe
US6530903B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Feb 22, 2001 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Feb 24, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3231
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A safety syringe comprising a casing having a neck and a plunger having a distal portion, a weak portion, and a coupling portion covered by a hollow stopper having a membrane. The plunger is channeled in the casing and is moveable between an extended position and a compressed position. A needle holder, in the neck, contains a distally facing arrowhead and a proximally facing needle. Moving the plunger from an extended position to a compressed position, causes the arrowhead to puncture the membrane and engage the coupling portion. If the plunger is returned to the extended position, the needle is drawn into the casing and the distal portion of the plunger can be removed. If the plunger is re-compressed, the needle encounters a wall in the neck preventing the needle from exiting the casing. The syringe is easy to manufacture and prevents manufacturing burrs from being injected into patients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.