Retractable hypodermic syringe
US7393343B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2002 |
| Grant date | Jul 1, 2008 |
| Priority date | — |
| Expiry date | Oct 4, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/3234
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A hypodermic syringe includes a barrel with a plunger slidably extending therein. The plunger includes an outer plunger element and an inner plunger element telescoping together. A plunger cap may be advanced after injection to rotate the plunger. A resistance lock retains the cap and plunger indexed until actuation. The rotation actuates latches and locking fingers on the luer hub to engage a probe axially and rotationally on the seal end of the plunger and disengage the slots in the barrel, respectively. The rotation disengages the seal stop to release the annular seal and finally releases the engagement between the outer plunger element and inner plunger element. The foregoing provides for the retraction of the luer hub and associated needle into the barrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.