Method and arrangement for measuring venous pressure
First Claim
1. A method of measuring venous pressure non-invasively, comprising:
- applying a variable compressive acting pressure to a measuring point, on an artery in a person'"'"'s extremity, at a compression point by a pressure generator, measuring the effect of the viable acting pressure on the artery at a second point, the second point being located farther away from the heart, and closer to the end point of the artery than the compression point to which the acting pressure is applied, transferring a measured value of the variable pressure acting on the measuring point at the compression point to an interpreting unit, measuring a pressure pulse caused by the heart at said second point by a sensor to measure the effect of the variable acting pressure, transferring said pressure pulse measurement to said interpreting unit, and determining a venous pressure by said interpreting unit on the basis of an acting pressure which is measured by a measuring element wherein said acting pressure is equal to said venous pressure when the interpreting unit detects a change characteristic of venous pressure in the pressure pulse signal measured by said sensor.
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Accused Products
Abstract
The invention relates to a method and arrangement for measuring venous pressure. The measurement is made non-invasively by applying a variable compressive acting pressure to a measuring point, such as a person'"'"'s extremity, at a compression point by a pressure generator, and at the same time the effect of the variable pressure on the circulation is measured at a second point located farther away from the heart, i e. closer to the end point of peripheral circulation than the compression point to which pressure is applied. The measured value of the acting pressure is transferred to an interpreting unit to which is also applied a pressure pulse caused by the heart and measured at said second point by a sensor to measure the effect of the variable acting pressure. In the interpreting unit venous pressure is determined on the basis of an acting pressure which is measured by a measuring element and which is the acting pressure when the interpreting unit detects a change in the pressure pulse signal measured by said sensor, the change being characteristic of venous pressure.
58 Citations
40 Claims
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1. A method of measuring venous pressure non-invasively, comprising:
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applying a variable compressive acting pressure to a measuring point, on an artery in a person'"'"'s extremity, at a compression point by a pressure generator, measuring the effect of the viable acting pressure on the artery at a second point, the second point being located farther away from the heart, and closer to the end point of the artery than the compression point to which the acting pressure is applied, transferring a measured value of the variable pressure acting on the measuring point at the compression point to an interpreting unit, measuring a pressure pulse caused by the heart at said second point by a sensor to measure the effect of the variable acting pressure, transferring said pressure pulse measurement to said interpreting unit, and determining a venous pressure by said interpreting unit on the basis of an acting pressure which is measured by a measuring element wherein said acting pressure is equal to said venous pressure when the interpreting unit detects a change characteristic of venous pressure in the pressure pulse signal measured by said sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An arrangement for measuring venous pressure, comprising:
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a pressure generator for applying a variable compressive acting pressure to a measuring point, on an artery in a person'"'"'s extremity, at a compression point, a measuring element for non-invasive measurement of the acting pressure, an interpreting unit for determining venous pressure, and a sensor for simultaneously non-invasively measuring the effect of the variable acting pressure on the artery at a second point, said second point being located farther away from the heart, and closer to the end point of the artery than the compression point to which the acting pressure is applied, and said sensor which measures the effect of the variable acting pressure being a sensor which measures the pressure pulse generated by heartbeat and which is coupled to said interpreting unit to which is also coupled a measurement signal indicating the measured value of the acting pressure, and the interpreting unit being arranged to determine the venous pressure non-invasively on the basis of an acting pressure which is the pressure acting when the interpreting unit detects a change characteristic of venous pressure in a pressure pulse signal measured by the sensor which measures the artery. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification