Measurement of systolic pressure
First Claim
1. A non-invasive method for measuring the systolic blood pressure of a digit having a distal part, the method comprising the steps of:
- applying and maintaining an astringent draining pressure greater than the systolic blood pressure of the digit on a first region located in the vicinity of the distal part of the digit, to substantially drain the digit of blood in said distal part, followed by,applying and maintaining an astringent occluding pressure greater than the systolic blood pressure of the digit on a second region of the digit located upstream of the first region,releasing the draining pressure,controllably releasing the occluding pressure, allowing blood to enter said drained distal region of the digit, and, at the same time, acquiring at least the occluding pressure and at least the blood volume of the digit at the first region as a function of time,calculating the systolic blood pressure corresponding to the occluding pressure at the time of blood return to the digit characterized by a substantially positive variation in the blood volume of the digit at the first region;
wherein the systolic blood pressure is measured only during deflation.
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Accused Products
Abstract
A noninvasive method for measuring systolic blood pressure Psyst, by applying and maintaining an astringent emptying pressure P1, which is above the systolic blood pressure Psyst, on a first zone of the finger located in the vicinity of the distal part of the finger, applying and maintaining an astringent occluding pressure P2, which is above the systolic blood pressure Psyst, on a second zone of the finger located upstream of the first zone, releasing the emptying pressure P1, releasing the occluding pressure P2 in a controlled manner, and, at the same time, acquiring at least the occluding pressure P2 and at least the blood volume Vs, at the level of the first zone as a function of time, and calculating the systolic blood pressure Psystcorresponding to the occluding pressure P2 at the moment of blood return in the finger, characterized by a substantially positive variation in the blood volume Vsof the finger at the level of the first zone.
8 Citations
18 Claims
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1. A non-invasive method for measuring the systolic blood pressure of a digit having a distal part, the method comprising the steps of:
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applying and maintaining an astringent draining pressure greater than the systolic blood pressure of the digit on a first region located in the vicinity of the distal part of the digit, to substantially drain the digit of blood in said distal part, followed by, applying and maintaining an astringent occluding pressure greater than the systolic blood pressure of the digit on a second region of the digit located upstream of the first region, releasing the draining pressure, controllably releasing the occluding pressure, allowing blood to enter said drained distal region of the digit, and, at the same time, acquiring at least the occluding pressure and at least the blood volume of the digit at the first region as a function of time, calculating the systolic blood pressure corresponding to the occluding pressure at the time of blood return to the digit characterized by a substantially positive variation in the blood volume of the digit at the first region; wherein the systolic blood pressure is measured only during deflation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16, 17, 18)
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9. A non-invasive device for measuring the systolic blood pressure of a digit having a distal part, the device comprising:
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a first element comprising a sensor configured to measure the blood volume of a digit at a first region located in the vicinity of the distal part of the digit, and a draining member configured to apply or transmit a draining pressure, that is greater than the systolic blood pressure of the digit, to the first region of the digit, and to substantially drain the digit of blood in said distal part, a second element comprising an arterial occluding member configured to apply and/or maintain an occluding pressure on a second region of the digit located upstream of the first region, to allow blood to enter the drained distal part of the digit, and a servo-controlled inflating and deflating device controlled by control electronics and ensuring the inflation and deflation of at least the arterial occluding member, a pressure measurement system measuring at least the pressure applied by the arterial occluding member, and a processing system controlled by the control electronics and comprising; an acquisition stage which acquires at least the data delivered by the pressure measurement system (16) and by the sensor, a processing unit comprising; means for determining the time when the blood volume of the digit at the first region varies substantially positively, means for calculating systolic blood pressure corresponding to the occluding pressure at the time when the blood volume in the digit at the first region varies substantially positively; wherein the device is configured to measure the systolic blood pressure only during deflation. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification