Infusion device having piston operated driving mechanism and positive pressure reservoir
US7255690B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2002 |
| Grant date | Aug 14, 2007 |
| Priority date | — |
| Expiry date | Jan 30, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/155
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A piston-type drive mechanism in combination with a positive pressure reservoir for delivery of infusion medium. A coil capable of being electrically activated to provide an electromagnetic field. The coil surrounds a piston channel extending in an axial direction. The piston channel provides a passage for communication of infusion medium from the positive pressure reservoir to an outlet chamber. A piston is located within the piston channel and is moveable axially within the channel to a forward position. The piston is moved toward a retracted position, when the coil is not energized. As the piston is moved to its forward position, pressure moves a valve member into an open position. When the valve member is in the open position, medium from the piston chamber is discharged into the outlet chamber. An outlet is provided in flow communication with the outlet chamber, for discharging infusion medium from the outlet chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.