Medication infusion device using negatively biased ambient pressure medication chamber
US8070745B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2005 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Dec 14, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/0266
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for infusing medication into a patient's body using a medication chamber referenced to ambient pressure. The apparatus includes a medication chamber enclosed by a peripheral wall which includes a movable portion configured to transfer exterior ambient pressure into the chamber. Means are provided for exerting a negative bias force acting on the movable portion in a direction opposed to the ambient pressure force. Thus, the resultant pressure in the chamber will be negative with respect to ambient pressure, reducing the risk that the chamber can be overpressurized and produce an unintended medication discharge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.