Device, an aggregate and a method for providing a gasified anesthetic agent

摘要

A respiratory anesthetic aggregate devised for coupling to a breathing apparatus has an anesthetic gasifier unit that has a breathing gas input port connected to a first point in an inspiratory patient gas delivery path of a breathing apparatus, and a fresh gas output port connected to a second point in the patient gas delivery path downstream the first point. The inspiratory patient gas delivery path is connected via a mainstream connection between the first and second point. Thereby the anesthetic gasifier unit is connected in a sidestream configuration to the patient gas delivery path for adding the gasified anesthetic agent in a desired concentration to the patient gas delivery path at the second point. When aggregate is coupled to a breathing apparatus, a substantially volume neutral delivery of anesthetic agent is provided to the breathing apparatus.

主权项

1. A respiratory anesthetic aggregate comprising:
a breathing apparatus comprising an inspiratory patient gas delivery path; an anesthetic gasifier unit that gasifies an anesthetic agent to enrich breathing gas free of expired CO2 with gasified anesthetic agent, said gasifier unit comprising a breathing gas input port and a fresh gas output port; said breathing gas input port being connected to a first point in said inspiratory patient gas delivery path downstream of said breathing apparatus by a breathing gas input line that supplies an amount of breathing gas free of expired CO2to the anesthetic gasifier; said fresh gas output port being connected to a second point in said inspiratory patient gas delivery path via a fresh gas output line; said second point being downstream of said first point in said inspiratory patient gas delivery path and downstream of said breathing apparatus, and said inspiratory patient gas delivery path being connected via a mainstream connection of breathing gas between said first point and said second point; said anesthetic gasifier unit being connected in a sidestream configuration to said inspiratory patient gas delivery path, between said first point and said second point, to add said gasified anesthetic agent in a desired concentration to said inspiratory patient gas delivery path at said second point, said sidestream connection between said first point and said second point insuring that the added gasified anesthetic agent does not increase said amount; a flow generator unit that provides a flow of breathing gas from said first point to said breathing gas input port of said anesthetic gasifier unit; and said flow generator unit being configured to provide a rate of said flow of breathing gas to said anesthetic gasifier unit from said first point that is less than a flow of gas supplied through said inspiratory patient gas delivery path by said breathing apparatus to said first point, to make a flow of gas via said mainstream connection toward said patient larger than zero when said flow generator unit provides a flow of breathing gas from said first point to said breathing gas input port of said anesthetic gasifier unit.