Multi-chamber, sequential dose dispensing syringe
US6997910B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 2004 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Aug 5, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3128
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A valve assembly is disclosed which effectively partitions a syringe into proximal and distal chambers to provide a multi-chamber, sequentially dispensing syringe apparatus. The valve assembly may be effectively used with a variety of standard, currently available commercial syringes and pre-filled syringes. Incorporated in the valve assembly is a valved stopper having a valve (which may be a slit valve), an impact sensor which opens the valve upon impact between the valve assembly and internal distal end of the syringe and a gas separator which separates liquid from gas disposed in the proximal chamber to assure gas is not delivered therefrom. The valve assembly is displaced as a plunger of the syringe is displaced via communication through fluid in the proximal chamber of the syringe. The actuator has a latching feature which latches the valve to an open state after being opened by the impact sensor. The gas separator has a proximally disposed orifice which facilitates priming. The valve assembly may be made from two parts. One part, a valved stopper, may be molded from the same rubber based material used in syringe plunger stoppers. The second part, the valve actuator, may be in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.