Syringe having needle isolation features
US5250037A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Dec 18, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/3202
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A hypodermic syringe has a syringe barrel with a distal end and a passage therethrough communicating with a fluid-receiving chamber in the syringe barrel. A barrier extends across the passage to isolate the fluid in the chamber. A needle cannula is mounted to a needle hub slidingly engaged at the distal end of the syringe barrel. The needle cannula includes a proximally facing point for piercing the barrier in the passage to the chamber of the syringe barrel. A needle shield is mounted to the distal end of the syringe barrel, and cam means are provided for cam-guided rotational movement between the needle shield and the syringe barrel. The cam shape causes the needle shield and the needle cannula to move proximally for initially piercing the barrier and then to move distally to enable separation of the needle shield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.