Back to results
US 6,648,833 B2Granted
Respiratory analysis with capnography
OwnerDavid R. Hampton, Baruch S. Kraussinventors
Life of this patent
Estimating the term…
Abstract
The invention presents techniques for identifying and guiding treatment for medical conditions, based upon the carbon dioxide concentration in the patient's breath. In an exemplary application, the techniques of the invention may be used to distinguish obstructive lung disease from restrictive lung disease, even though the symptoms of the conditions are similar. The techniques of the invention may further be used to monitor the effectiveness of the treatment.
Claims42
A method comprising:
- measuring a concentration of carbon dioxide in a breath expired by a patient;
- and
- determining the presence of restrictive lung disease as a function of the measurement.
A device comprising:
- a gas sensor that measures the concentration of carbon dioxide in a breath expired by a patient;
- and
- a processor that determines the presence of restrictive lung disease as a function of the measurement.
A method comprising:
- measuring a first concentration of carbon dioxide in a breath expired by a patient;
- guiding treatment of the patient as a function of the measurement, wherein guiding treatment comprises at least one of determining the presence of restrictive lung disease and suggesting a medicine;
- measuring a second concentration of carbon dioxide in a second breath expired by the patient after a treatment;
- and
- monitoring the response of the patient to the treatment as a function of the measurement of the second concentration.
2 more elements
An apparatus comprising:
- a sensing means that measures the concentration of carbon dioxide over time in a breath expired by a patient;
- a processing means that determines the presence of restrictive lung disease as a function of the measurement;
- and
- an output means that reports the determination.
1 more element
A method comprising:
- measuring a concentration of carbon dioxide in a breath expired by a patient;
- and
- distinguishing between one of obstructive lung disease and restrictive lung disease as a function of the measurement,
- wherein distinguishing between one of obstructive lung disease and restrictive lung disease as a function of the measurement comprises measuring the ascending slope of a curve traced by the measurements of the concentration of carbon dioxide over time.
1 more element
A method comprising:
- measuring a concentration of carbon dioxide in a breath expired by a patient;
- and
- determining the presence of one of obstructive lung disease and restrictive lung disease as a function of the measurement, wherein determining the presence of one of obstructive lung disease and restrictive lung disease as a function of the measurement comprises:
- measuring the duration of a steady rise of the concentration of carbon dioxide;
- determining the presence of obstructive lung disease when the duration is longer than a threshold duration;
- and
- determining the presence of restrictive lung disease when the duration is shorter than the threshold duration.
4 more elements
A method comprising:
- measuring a concentration of carbon dioxide in a first breath expired by a patient;
- determining the presence of one of obstructive lung disease and restrictive lung disease as a function of the measurement;
- measuring a concentration of carbon dioxide in a second breath expired by the patient following treatment;
- and
- evaluating a change in concentration of carbon dioxide between the first breath and the second breath.
2 more elements
A method comprising:
- measuring a first concentration of carbon dioxide in a first breath expired by a patient;
- measuring a second concentration of carbon dioxide in a second breath expired by the patient after a treatment;
- and
- monitoring the response of the patient to the treatment as a function of the measurement of the second concentration.
1 more element
Dependencies are inferred from the claim text.