Controlled retraction syringe and plunger therefor
US8167837B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2006 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Apr 18, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3241
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A retractable syringe (11) and plunger (20) therefore are provided, whereby the plunger comprises a controlling means (62) which facilitates control of the rate of retraction of the retractable needle. By controlling the rate of needle retraction, the likelihood of blood spattering is reduced, thereby improving the user-friendliness and appeal of the retractable syringe. Typically, the syringe is a prefilled syringe. Following plunger depression, a symmetrical ejector member (92) releases the retractable needle (40) from a retaining member (30) to thereby allow retraction of the retractable needle. Needle retraction is facilitated by a biasing means (70), such as a spring or other compressible and/or de-compressible device. The plunger comprises a plunger housing (21), in which is located the controlling means. The controlling means may be a pneumatic air space (324) inside the plunger housing which automatically acts against the retracting needle to thereby control or regulate the rate of retraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.