| 摘要 |
Methods and apparatuses are described for direct rapid measurement of pulmonary flow resistance. A measurement of a first pressure in a gas-tight chamber is received from a pressure sensor when a gas output port of the chamber is closed, a patient is blowing into a gas inlet of the chamber at a given pressure, and a gas-flow path between the inlet and output port has a resistance value. A measurement of a second pressure in the chamber is received from the pressure sensor and a measurement of gas flow through the chamber is received from a gas flow sensor when the output port is opened and the patient is blowing into the inlet to maintain the given pressure relatively constant. A pulmonary flow resistance is computed based upon the measurement of the first pressure, the measurement of the second pressure, the resistance value, and the measurement of gas flow. |
| 主权项 |
1. A device for measuring pulmonary flow resistance, the device comprising:
a housing that defines a gas-tight chamber, the chamber having a gas inlet and a gas output port and a gas-flow path between the gas inlet and the gas output port, the gas-flow path having a first resistance value, wherein the gas output port is configured to switch selectively between (i) an open position in which gas can flow out of the chamber through the gas output port and (ii) a closed position in which gas flow out of the chamber is blocked; a gas flow sensor configured to measure flow of gas through the chamber; a pressure sensor configured to measure pressure in the chamber; and a controller configured to
(a) receive, when the output port is closed and a patient is blowing into the gas inlet at a given pressure, a measurement of a first pressure from the pressure sensor,(b) receive, after step (a) has been performed, and when the gas output port is opened and the patient is blowing into the gas inlet so as to maintain the given pressure relatively constant, a measurement of a second pressure from the pressure sensor and a measurement of a first gas flow from the gas flow sensor, and(c) compute a first pulmonary flow resistance based upon the measurement of the first pressure, the measurement of the second pressure, the first resistance value, and the measurement of the first gas flow. |
