Method and device for continuous, non-invasive determination of blood pressure
First Claim
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1. A method for continuous, non-invasive determination of blood pressure by means of a photoplethysmographic system comprising a mounting element including at least one light source and at least one light detector, the method comprising:
- obtaining an initial photoplethysmographic signal using the photoplethysmographic system;
obtaining a photoplethysmographic signal using the photoplethysmographic system;
disposing the mounting element on a body part containing an artery, andvarying a contact pressure of the mounting element depending on a mean arterial blood pressure, wherein a rate of change of the contact pressure of the mounting element is smaller than that of a pulsatile blood pressure changes in the artery;
wherein the contact pressure of the mounting element is varied by a control system departing from an initial contact pressure, wherein the control system uses a low-pass filter through which the a photoplethysmographic signal is passed to generate a filtered photoplethysmographic signal, which is compared with the initial photoplethysmographic signal; and
wherein, based on the comparison, the contact pressure is varied until the filtered photoplethysmographic signal again corresponds to the initial photoplethysmographic signal.
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Abstract
The invention relates to a method and a device for continuously determining blood pressure in a non-invasive manner using a photoplethysmographic system which has at least one light source and at least one light detector that is arranged with a mount on a body part containing an artery. According to the invention, a device is provided with which the contact pressure of the mount on the body part can be adjusted and/or changed depending on the mean blood pressure.
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9 Claims
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1. A method for continuous, non-invasive determination of blood pressure by means of a photoplethysmographic system comprising a mounting element including at least one light source and at least one light detector, the method comprising:
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obtaining an initial photoplethysmographic signal using the photoplethysmographic system; obtaining a photoplethysmographic signal using the photoplethysmographic system; disposing the mounting element on a body part containing an artery, and varying a contact pressure of the mounting element depending on a mean arterial blood pressure, wherein a rate of change of the contact pressure of the mounting element is smaller than that of a pulsatile blood pressure changes in the artery; wherein the contact pressure of the mounting element is varied by a control system departing from an initial contact pressure, wherein the control system uses a low-pass filter through which the a photoplethysmographic signal is passed to generate a filtered photoplethysmographic signal, which is compared with the initial photoplethysmographic signal; and wherein, based on the comparison, the contact pressure is varied until the filtered photoplethysmographic signal again corresponds to the initial photoplethysmographic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification