Retracting needle syringe
US6036674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1998 |
| Grant date | Mar 14, 2000 |
| Priority date | — |
| Expiry date | Dec 18, 2018 |
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. 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 having an inner hub having an open proximal end and a distal end connected to the needle cannula so that the lumen of the cannula is in fluid communication with the chamber. A flange on the inner hub is connected to a proximal end of an outer hub so that the needle cannula projects distally outwardly from a distal end of the outer hub. A spring is contained between the inner hub and the outer hub. A circular release element is movably connected to a proximal end of the flange. 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 dissociate an outer portion of the flange from an inner portion of the flange allowing the spring to e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.