Disposable safety syringe
US6846301B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2002 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Apr 9, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3242
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A safety syringe 10 includes a generally tubular body 14 having a needle end 18 and plunger end 22, needle 38 and retractable needle seat 30, two-way valve 36, plunger 42, stopper 62, piston 52, and rear plunger seal 44. During use, the plunger may be moved to create a vacuum in the plunger. The user then moves the plunger toward the needle end, pressurizing a vial, then pulls backward to a selected position corresponding to the desired volume of fluid to be withdrawn. At the conclusion of the injection stroke, the piston is disengaged from the plunger. The vacuum within the plunger retracts the needle safely into the tubular body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.