Dosing device for adding an additive fluid to breathing gas in an anaesthesia machine or ventilator
US6032665A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1997 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Apr 24, 2017 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2202/0291
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dosing device for adding small amounts of an additive gas or liquid, such as NO or liquid anaesthetic, to a breathing gas in an inspiratory line in an anaesthetic machine or ventilator, has a constant-volume dosing chamber with an inlet, equipped with a first valve, for connection to a source of gas or liquid supplying the additive gas or liquid at a predetermined, constant, positive pressure, and an outlet, equipped with a second valve, for injecting gas or liquid from the dosing chamber into breathing gas. Control elements are arranged to open and close the valves in a controlled fashion. A control unit is also arranged to cause the operating elements to open the second valve for one or a number of predetermined intervals during the inspiratory phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.