Special gas dose delivery apparatus for respiration equipment
AssigneeInstrumentarium Corp.
InventorErkki Heinonen
Life of this patent
Estimating the term…
Abstract
A special gas dose delivery unit for respiratory equipment has a special gas flow conduit connected to a special gas source. The unit includes a supply of carrier gas for the special gas, preferably obtained by withdrawing gas from the inspiration limb of the patient breathing circuit. A valve, controllable in accordance with desired special gas dose parameters and the breathing pattern of the patient, injects the special gas into the carrier gas for provision to the outlet conduit of the special gas dose delivery unit. The outlet conduit is connected to the patient limb of the breathing circuit for delivery to the patient.
Claims30
A special gas dose delivery unit for respiration equipment, said respiration equipment having a respirator supplying respiratory gases to a breathing circuit for provision to a patient, said respiration equipment having means for providing an indication of patient respiration, said special gas dose delivery unit comprising:
- a flow conduit (19) for the special gas, said flow conduit having one end connectable to a special gas source;
- a supply (23) of carrier gas for providing a carrier gas flow in an outlet conduit (22) for the special gas dose delivery unit, said outlet conduit having a discharge end connectable to the breathing circuit, the carrier gas supply having an input connectable to the breathing circuit and means for withdrawing gas from the breathing circuit for obtaining carrier gas for provision to said outlet conduit;
- a controllable valve (21) having an inlet connected to said flow conduit and an outlet connected to said outlet conduit, said valve being operable to inject the special gas into the carrier gas flow in the outlet conduit;
- means (27) for setting desired parameters of the special gas dose;
- and
- a control unit (26), said control unit receiving inputs from the patient respiration indicating means in the respiration equipment and said parameter setting means, said control unit having an output connected to said controllable valve for operating said valve in accordance with said inputs for causing said valve to inject a special gas dose having the desired parameters and timing into the carrier gas for delivery to the patient.
A special gas dose delivery unit for a breathing circuit providing respiratory gases to a patient, said breathing circuit having means for providing an indication of patient respiration, said special gas dose delivery unit comprising:
- a flow conduit for the special gas, said flow conduit having one end connectable to a special gas source;
- a supply of carrier gas having an input connectable to the breathing circuit and means for withdrawing gas from the breathing circuit for obtaining carrier gas for providing a carrier gas flow in an outlet conduit for the special gas dose delivery unit, said outlet conduit having a discharge end connectable to the breathing circuit;
- a controllable valve having an inlet connected to said flow conduit and an outlet connected to said outlet conduit, said valve being operable to inject the special gas into the carrier gas flow in the outlet conduit;
- means for setting desired parameters of the special gas dose;
- and
- a control unit, said control unit receiving inputs from the patient respiration indicating means in the breathing circuit and said parameter setting means, said control unit having an output connected to said controllable valve for operating said valve in accordance with said inputs for causing said valve to inject a special gas dose having the desired parameters and timing into the carrier gas for delivery to the patient.
A method for supplying a special gas dose to a breathing circuit of a patient, the breathing circuit supplying a flow of breathing gas to the patient, said method comprising the steps of:
- flowing a special gas through a flow conduit from a special gas source;
- extracting a portion of the flow of breathing gas from the breathing circuit and supplying the extracted portion of breathing gas into an outlet conduit to provide a carrier gas flow in the outlet conduit;
- indicating patient respiration characteristics;
- establishing the desired parameters of a special gas dose;
- operating a flow regulating valve in the flow conduit to inject the special gas dose into the carrier gas flow in the outlet conduit in accordance with the patient respiration characteristics and the desired dose parameters;
- and
- returning the carrier gas to the breathing circuit along with the injected dose of special gas.
Dependencies are inferred from the claim text.