Retracting needle syringe
US6221052A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2000 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Feb 17, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/508
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A retracting needle syringe includes a barrel having a chamber, an open proximal end and an open distal end including a passageway therethrough having a proximal end and a distal end. A plunger is slidably positioned in fluid-tight engagement with an inside surface of the barrel. The plunger has an elongated cavity in its distal end and a cover element sealing the cavity. A needle assembly at the distal end of the barrel includes a needle cannula and a hub having an open proximal end and a distal end connected to the needle cannula so that the lumen of the needle cannula is in fluid communication with the chamber. A flange portion of the inner hub is positioned in the proximal end of the passageway so that the needle cannula projects distally outwardly from a distal end of the passageway. A spring is contained between the hub and the distal end of the passageway. A circular release element is movably connected to a proximal end of the hub. The release element has a distal end and a sharp proximal end projecting into the chamber, wherein distal motion of the plunger will cause the sharp proximal end to cut through the cover element and the distal end of the release element to dissoc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.