Intra-vessel measurement of blood parameters
First Claim
1. A method for changing disposition of a blood parameter sensor and for reducing or eliminating the effect of wall effect on the sensor, the sensor having at least one sensing element, the at least one sensing element being located in flowing blood in a blood vessel through which blood flows the method comprisingdetecting and measuring a blood parameter of the flowing blood with the at least one sensing element,compiling a plurality of measurements of the blood parameter over a time period,comparing the measurements to determine whether the blood parameter is changing,moving the at least one sensing element while maintaining it in the flowing blood with nothing between the at least one sensing element and the wall of the blood vessel other than the flowing blood, and moving the at least one sensing element so that wall effect on the at least one sensing element is reduced permitting more accurate measurement of the blood parameter.
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Accused Products
Abstract
Methods and apparatuses for detecting undesirable wall effect on blood parameter sensors and for moving such sensors to reduce or eliminate said wall effect; and, in one aspect, a sensor with a plurality of spaced apart sensing elements with respect to which wall effect is reduced upon rotation of the sensor.
49 Citations
8 Claims
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1. A method for changing disposition of a blood parameter sensor and for reducing or eliminating the effect of wall effect on the sensor, the sensor having at least one sensing element, the at least one sensing element being located in flowing blood in a blood vessel through which blood flows the method comprising
detecting and measuring a blood parameter of the flowing blood with the at least one sensing element, compiling a plurality of measurements of the blood parameter over a time period, comparing the measurements to determine whether the blood parameter is changing, moving the at least one sensing element while maintaining it in the flowing blood with nothing between the at least one sensing element and the wall of the blood vessel other than the flowing blood, and moving the at least one sensing element so that wall effect on the at least one sensing element is reduced permitting more accurate measurement of the blood parameter.
Specification