Controlled retraction syringe and plunger therefor
US8114050B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 2006 |
| Grant date | Feb 14, 2012 |
| Priority date | — |
| Expiry date | May 11, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3241
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A retractable syringe (10) and plunger (20) therefore are provided, the syringe having a barrel (20), a retractable needle mount (40) to which is mounted or is mountable a needle (11), and a plunger (80), the plunger comprising an initially compressed spring (60), a means for engaging the retractable needle mount, an integrally formed plunger seal (22) and a removable controlling means (70) for facilitating control of the rate of retraction of needle mount when engaged with plunger. The needle mount is held in the barrel by a holding means which prevents inadvertent retraction of the needle mount when the plunger is withdrawn to fill the syringe. The holding means comprises a plurality of clips (196A, 196B, 196C) that may be integrally formed with the barrel or may be present on a cap mounted to the barrel. An ejector means (52) is also provided, whereby plunger depression can urge the ejector means to release the needle from the holding means and thereby allow retraction of the needle mount following decompression of the spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.