Inhalation anaesthesia equipment
AssigneeSiemens Aktiengesellschaft
InventorsSven-Gunnar Olsson, Goeran Rydgren
Life of this patent
Estimating the term…
Abstract
Equipment for administering gaseous anesthetic to a patient has at least one anesthetic reservoir serving as the originating source for anesthetic and a ventilator to which the gas is supplied from the reservoir, the ventilator being in communication with the breathing passages of a patient. To maintain the consumption of anesthetic gas as low as possible and to also assure that the patient is constantly ventilated with fresh anesthetic gas having a defined consumption, the exhalation gas from the patient is fed back to the originating anesthetic source via at least one filter in which predetermined gas components, such as water vapor and carbon dioxide are filtered out. The exhalation gas may be returned to the originating source either directly or through a compressor.
Claims27
A system for administering anesthesia to a patient by inhalation through the breathing passages of said patient, said system comprising:
- an originating pressurized source for an anesthetic;
- a ventilator means for supplying said anesthetic from said originating source to said breathing passages of said patient including an inspiration line and an expiration line, said expiration line being separate from said originating source;
- and
- means for returning gas from said expiration line into said originating source through at least one filter which filters predetermined gas components out of said gas from said expiration line.
A system for administrating anesthetic to the breathing passages of a patient comprising:
- an originating pressurized source containing anesthetic;
- a source of at least one additional gas;
- means for mixing said anesthetic and said additional gas;
- a ventilator having an input connected to an output of said means for mixing;
- means communicating an output of said ventilator with said breathing passages of said patient for supplying a gas mixture from said means for mixing to said patient, said means for supplying including an inspiration line and an expiration line,;
- means for returning exhaled gas from said patient into said originating source for storage in said source, said means for returning connecting said expiration line to said originating source;
- and
- at least one filter means for removing selected gases from said exhalation gas disposed in said means for returning.
A system for administering anesthetic to the breathing passages of a patient comprising:
- an originating source having a plurality of containers each containing gas therein of a different characteristic;
- a ventilator;
- means for connecting at least one of said plurality of containers to an input of said ventilator;
- means for communicating said ventilator with the breathing passages of said patient including an inspiration line and an expiration line;
- a return line connecting said expiration line to said originating source for returning exhaled gas from said patient to said originating source;
- at least one filter means in said return line for removing selected gas components from said exhaled gas before said exhaled gas is returned to said originating source;
- a compressor disposed in said return line;
- a switch-over valve disposed in said return line after said compressor which selectively diverts said exhaled gas from said return line to one of said plurality of containers in said originating source;
- monitoring means connected to said return line between said expiration line and said compressor for measuring the pressure of the gas in said return line ahead of said compressor and generating an electrical signal corresponding thereto;
- gas analyzer means connected to said return line between said compressor and said switch-over valve for monitoring a characteristic of the gas in the return line after said compressor and generating an electrical signal thereto;
- and
- control means responsive to said signal from said monitoring means to control operation of said compressor and responsive to said signal from said gas analyzer means to control operation of said switch-over valve.
A method for administering anesthetic gas to the breathing passages of a patient comprising the steps of:
- drawing anesthetic gas from an originating pressurized source to a ventilator connected to the breathing passages of said patient;
- ventilating the patient with anesthetic gas by said ventilator via an inspiration line and an expiration line;
- filtering selected gas components from exhaled gas from said patient from said expiration line to obtain filtered gas;
- returning the filtered gas into said originating source;
- and
- storing the filtered gas in said originating source for reuse.
Dependencies are inferred from the claim text.