| 摘要 |
A system and method for measuring flow of a fluid flowing in a narrow channel. A sensor is provided, having an element sensitive to pressure, and an element sensitive to a selected chemical or physical property, both arranged at the distal end of a guide wire, for registering pressure values and values of said selected chemical or physical property. The sensor is located at a point of measurement in the narrow channel. A bolus of liquid having a property distinguishable from the selected property of the flowing fluid and detectable by the second sensitive element is injected into the fluid, and registered with said first sensitive element is a pressure pulse resulting from said injecting step. A point in time of the pulse is taken as a starting point for measuring elapsed time. Registered with the second sensitive element is the distinguishable property of the bolus in the fluid when the bolus in the fluid passes the second sensitive element. The elapsed time from the injecting of the bolus, up to the registering of the distinguishable property is noted, and a flow parameter is calculated on the basis of a value of the registered pressure pulse and a value of the distinguishable property.
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