METHOD AND ARRANGEMENT FOR DETERMINING A VENTILATION NEED SPECIFIC FOR A PATIENT
First Claim
1. A method for determining a ventilation need specific for a patient, said method comprising:
- providing a breath gas with a machine ventilator circuit from a starting pressure to lungs of the patient to start inspiration;
filling lungs to a predetermined breath gas pressure level;
determining in a control unit a filling volume of the breath gas needed to achieve said predetermined breath gas pressure level from said starting pressure;
determining in said control unit a lung elastic property based on a relationship between said determined filling volume of the breath gas and differences in said starting pressure and said predetermined breath gas pressure level; and
determining in said control unit a respiration rate exploiting at least said lung elastic property.
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Abstract
A method for determining a ventilation need specific for a patient is disclosed herein. The method includes providing a breath gas with a machine ventilator circuit from a starting pressure to lungs to start inspiration, and filling lungs to a predetermined breath gas pressure level. The method also includes determining in a control unit a filling volume of the breath gas needed to achieve the predetermined breath gas pressure level from the starting pressure, and determining in the control unit a lung elastic property based on a relationship between the determined filling volume of the breath gas and differences in the starting pressure and the predetermined breath gas pressure level. The method also includes determining in the control unit a respiration rate exploiting at least the lung elastic property. A corresponding arrangement is also provided.
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Citations
20 Claims
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1. A method for determining a ventilation need specific for a patient, said method comprising:
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providing a breath gas with a machine ventilator circuit from a starting pressure to lungs of the patient to start inspiration; filling lungs to a predetermined breath gas pressure level; determining in a control unit a filling volume of the breath gas needed to achieve said predetermined breath gas pressure level from said starting pressure; determining in said control unit a lung elastic property based on a relationship between said determined filling volume of the breath gas and differences in said starting pressure and said predetermined breath gas pressure level; and determining in said control unit a respiration rate exploiting at least said lung elastic property. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An arrangement for determining a ventilation need specific for a patient, said arrangement comprising:
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a machine ventilator circuit configured to connect to lungs of the patient and which machine ventilator circuit comprises an inspiration delivery unit for delivering a gas flow to assist an inspiration, at least one flow sensor for measuring said gas flow and an expiration circuit for controlling a discharge of an expiration gas; and a control unit configured to control an operation of said machine ventilator circuit, wherein said machine ventilator circuit is configured to provide a breath gas from a starting pressure to lungs of the patient to start inspiration; and
to fill lungs to a predetermined breath gas pressure level; andwherein said control unit is configured to determine a filling volume of the breath gas, based on said measured gas flow, needed to achieve said predetermined breath gas pressure level from said starting pressure;
to determine a lung elastic property based on a relationship between said determined filling volume of the breath gas and differences in said starting pressure and said predetermined breath gas pressure level; and
to determine a respiration rate exploiting at least said lung elastic property. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for determining a ventilation need specific for a patient, said method comprising:
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providing a breath gas with a machine ventilator circuit from a starting pressure to lungs of the patient to start inspiration; filling lungs to a predetermined breath gas pressure level; determining in a control unit a filling volume of the breath gas needed to achieve said predetermined breath gas pressure level from said starting pressure; determining in said control unit a lung elastic property based on a relationship between said determined filling volume of the breath gas and differences in said starting pressure and said predetermined breath gas pressure level; determining in said control unit a target breath volume, which is based on one of said determined filling volume of the breath gas and some other relationship to said lung elastic property; determining in said control unit a respiration rate exploiting said lung elastic property and said target breath volume; releasing in an expiration circuit the pressure of lungs from said predetermined breath gas pressure level; determining in said control unit a time needed for the release of the pressure of the lungs; receiving in said control unit an inspiration to expiration time ratio; and determining in said control unit an expiration time based on said inspiration to expiration time ratio, said time needed for the release of the pressure of the lungs, and said respiration rate; and determining in said control unit an inspiration time based on said determined expiration time and said determined respiration rate. - View Dependent Claims (20)
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Specification