Pre-filled syringe with flow valve
US5273542A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1992 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Sep 14, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/287
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention is a hypodermic syringe pre-filled with a volume of a desired solution. A plug member is positioned within the hypodermic syringe in between the pre-filled fluid and the lumen of the syringe's cannula. The presence of the plug member within the hypodermic syringe separates the cannula from the pre-filled fluid thereby leaving the cannula unaffected by the presence of the fluid within the syringe. As the plunger of the hypodermic syringe is engaged, the pressure of the pre-filled fluid is increased. The fluid pressure acts upon the plug member, displacing the plug member when a predetermined fluid pressure is achieved. Once the plug member is displaced, the occlusion between the pre-filled fluid and the cannula is removed and the pre-filled fluid is free to flow through the lumen of the cannula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.