Retractable needle syringe
US5533970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Sep 28, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/502
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A retractable needle syringe includes a barrel having an inside surface defining a chamber, an open proximal end and a distal end. An elongate plunger is slidably positioned in fluid-tight engagement with the inside surface of the barrel. The plunger includes a distal end, a proximal end and a radially directed projection on its distal end. A movable carrier is positioned in fluid-tight engagement with the inside surface of the barrel. The carrier includes an outside surface, a distal end, a proximal end, and a passageway therethrough in fluid communication with the chamber. The proximal end of the carrier includes an open-ended groove which is sized and shaped to receive the plunger projection. The groove includes an axial portion and a circumferential portion. The plunger is movable axially so that the plunger projection can enter and exit the axial portion of the groove. Rotation of the plunger with respect to the carrier causes the projection to enter the circumferential portion of the groove, containing said projection so that said plunger rod can apply axially directed force and rotationally directed force to the carrier. A needle cannula projects outwardly from the distal en…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.