Syringe plunger tip
US5735825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Mar 22, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/31521
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A sealing cap is provided for attachment to the end of a syringe plunger. The sealing cap has an annular sidewall with an annular first sealing wing projecting distally therefrom, an annular second sealing wing positioned proximal of the first sealing wing and projecting proximally, and an annular sealing ridge encircling and radially projecting out from between the first sealing wing and the second sealing wing. The sealing cap further includes an interior cavity having an annular side surface aligned with the annular sidewall. A side groove is recessed within the side surface so as to be aligned slightly proximal of the annular sealing ridge. The distal end of a syringe plunger has a head mounted thereon that is substantially complementary to the configuration of the internal cavity of the sealing cap. More specifically, a tapered ridge is formed on the periphery of the head to complementarily be received within the side groove. As a positive pressure is created against the sealing cap, the first sealing wing flexes against the interior surface of the barrel and the annular sealing ridge urges against the interior surface of the barrel, thereby increasing the effective seal. As a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.