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Contactless respiration monitoring of a patient and optical sensor for a photoplethysmography measurement

A photoplethysmography, optical sensor technology, used in sensors, evaluation of respiratory organs, diagnostic recording/measurement, etc., can solve problems such as undetectable, pulse waves unable to reach the measurement position, blocking blood vessels, etc.

Inactive Publication Date: 2011-04-13
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] A problem specifically encountered in reflective PPG setups is that the pressure of the skin against the LED / photodiode combination can be so high that it actually blocks the blood vessel, preventing the pulse wave from reaching the measurement site and thus the was detected
However, attaching the sensor to the patient's chest is inconvenient and time-consuming

Method used

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  • Contactless respiration monitoring of a patient and optical sensor for a photoplethysmography measurement
  • Contactless respiration monitoring of a patient and optical sensor for a photoplethysmography measurement
  • Contactless respiration monitoring of a patient and optical sensor for a photoplethysmography measurement

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Embodiment Construction

[0048] According to a first preferred embodiment of the invention, it is proposed to combine a light unit 1 with an optical sensor for reflective photoplethysmography measurements with its light emitter 2 and its light detector 3, i.e. with its LED / photodiode The assembly is embedded in an elastic material 4 such as silicone that will yield to finger pressure. The corresponding reflective PPG setup can be seen in Figure 1. Here, FIG. 1 shows that the patient's finger 5 is pressed against the elastic material 4 in which the light unit 1 with the light emitter 2 and the light detector 3 is provided. In its boundary region, the elastic material 4 is surrounded by a rigid carrier 6 . In this way, finger capillary blockage is avoided over a wide range of finger pressure.

[0049] As can be seen from FIG. 1, the elastic material 4 deforms depending on the amount of finger pressure applied, and because of this deformation, blockage of the capillaries 7 is avoided, allowing for a wi...

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Abstract

The invention also relates to an optical sensor for a photoplethysmography measurement, comprising a light unit (1) with a light emitter (2) for emitting light into tissue of a patient (8) and / or a light detector (3) for detecting a part of the emitted light after interaction with the tissue, wherein the light unit is embedded in an elastic material (4). The invention further relates to a device for contactless respiration monitoring of a patient (8), comprising: a distance sensor for consecutively detecting the temporal distance variations relative to the patient's chest (12), preferably based on electromagnetic waves; and a calculating unit for determining the breathing activity based on the detected temporal distance variations. The invention is especially useful for providing a reliable and easy to use possibility for simultaneously monitoring respiration action, blood pressure and heart rate with a handheld device which can be used for spot- checking the vital parameters of patients in hospitals.

Description

technical field [0001] The present invention relates to the field of non-contact respiration monitoring of patients and optical sensors for photoplethysmography measurements, and in particular to a hand-held device for simultaneous monitoring of respiration activity, blood pressure and heart rate, preferably able to be used in spot check hospitals Patient parameters. Background technique [0002] The arrival of the pulse wave can be detected in the patient's finger by means of optical measurements: typically an infrared LED shines light into the finger, and the amount of light reaching a photodiode causes a photocurrent to flow through the diode. In the presence of a pulse wave, the light is mostly absorbed by the blood, ie the current through the photodiode is modulated accordingly. This technique is called photoplethysmography (PPG). [0003] If the LED and photodiode are mounted on opposite sides of the finger so that the LED light actually shines through the finger, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61B5/024A61B5/0205A61B5/113A61B5/08G01S13/00A61B5/332
CPCG01S13/88A61B5/0205A61B5/02438A61B5/14552A61B5/02416A61B5/0816A61B5/6838A61B5/02125A61B5/6826A61B5/0245A61B5/1135
Inventor R·平特J·米尔史蒂夫G·斯佩克维尔斯D·于S·M·L·德沃特G·J·米施X·L·M·A·奥贝特
Owner KONINK PHILIPS ELECTRONICS NV
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