Hypodermic syringe with a selectively retractable needle
US6599268B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2000 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Feb 21, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2207/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A syringe has a retractable needle and a barrel having an open proximal end and an open distal end defining a receiver with an inward shoulder. The barrel has a hollow bore, an elongate plunger with a proximal end and a distal open end with a cavity therewithin. A stopper occludes the open end of the cavity. The syringe has an elongate hub with a proximal flange. The hub is within and sized for slidable movement within the receiver at the distal end of the barrel with the flange defining a distal end of a chamber. There is a sleeve sized to fit with a clearance about the hub disposed between the shoulder and the flange when the hub is in the receiver, the sleeve having a sharpened proximal end disposed against the flange. The needle has a pointed distal end and a proximal end connected to the passageway of the hub with the pointed end of the needle extending outwardly. There is a spring disposed about the hub compressed to provide a bias between the receiver and the flange so that when a force greater than required to expel fluid from the chamber is applied, the plunger causes the cutting surface to cut through the flange and stopper and expose the cavity to allow the spring to urg…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.