Fluid dispensing arrangement
US3941128A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Oct 18, 1994 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/287
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A fluid dispensing arrangement for injecting liquid parenteral drugs or other liquids, including a syringe or cartridge with a needle-hub secured thereto, a plunger in the syringe or cartridge for effecting liquid discharge and injection, and a combination sealing and by-pass valve plug initially in a radially compressed sealing position at the forward end of the cartridge or syringe body or barrel and separating the liquid in the cartridge or syringe body or barrel from the needle-hub assembly, the valve plug being longitudinally forwardly movable to a by-pass discharge position within a by-pass chamber of larger diameter than the normal unrestricted and uncompressed diameter of the plug. The plug has tapered cruciform ends with corresponding circumferentially spaced by-pass grooves formed thereby at its opposite ends to aid in liquid by-pass therepast during liquid discharge or aspirating action.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.