WEARABLE HEMODYNAMIC SENSOR
First Claim
1. A method for the continuous non-invasive measurement of hemodynamic parameters within a wearable device comprising:
- measuring a photoplethysmographic signal disposed on a body part containing an artery using a photoplethysmographic system having;
at least one light source; and
at least one light detector generating the photoplethysmographic signal;
wherein the contact pressure of the photoplethysmographic system can be varied by an actuator;
wherein the movement of the actuator and the contact pressure is controlled by a control system using at least a part of the photoplethysmographic signal;
wherein the true pulsatile BP-signal and further calculated hemodynamic parameters are derived from the contact pressure and the photoplethysmographic signal; and
wherein the hemodynamic parameters are further derived from a transfer function.
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Accused Products
Abstract
A wearable device and the accompanying method for the determination of continuous pulsatile BP are described. The absolute values can be obtained in the initial phase and how a transfer function can transform the BP-signal obtain at the finger or wrist to correct BP-values corresponding to the brachial artery and at heart level. The wearable device contains an orthostatic level-correcting element, which can measure the vertical distance between heart level and finger/wrist level, where the actual measurement takes places. The wearable device may be in the form of a ring, a watch, or a bracelet. Further, the wearable device has elements for wirelessly transmitting signals to host devices such as a smart phone, tablet or other computers.
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Citations
21 Claims
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1. A method for the continuous non-invasive measurement of hemodynamic parameters within a wearable device comprising:
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measuring a photoplethysmographic signal disposed on a body part containing an artery using a photoplethysmographic system having; at least one light source; and at least one light detector generating the photoplethysmographic signal; wherein the contact pressure of the photoplethysmographic system can be varied by an actuator; wherein the movement of the actuator and the contact pressure is controlled by a control system using at least a part of the photoplethysmographic signal; wherein the true pulsatile BP-signal and further calculated hemodynamic parameters are derived from the contact pressure and the photoplethysmographic signal; and wherein the hemodynamic parameters are further derived from a transfer function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wearable device for measuring hemodynamic parameters comprising:
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a photoplethysmographic system having; one or more light sources; one or more light detectors that generate the photoplethysmographic signal; a mounting element for attaching the photoplethysmographic system to a body part containing an artery having an actuator; a control system for controlling the actuator and the contact pressure of the photoplethysmographic system; and an accelerator or motion sensor placed next to the photoplethysmographic system used for heart level correction. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification