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Monitoring physiological parameters based on variations in a photoplethysmographic signal

A technology of photoplethysmography and physiological parameters, applied in the field of physiological parameters

Inactive Publication Date: 2005-07-27
DATEX OHMEDA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional pulse oximeters generally do not monitor changes in the DC component of single or multiple photoplethysmographic signals to obtain physiological parameter information other than the above-mentioned output

Method used

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  • Monitoring physiological parameters based on variations in a photoplethysmographic signal
  • Monitoring physiological parameters based on variations in a photoplethysmographic signal
  • Monitoring physiological parameters based on variations in a photoplethysmographic signal

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Embodiment Construction

[0056] The present invention relates to obtaining physiological parameter information of a patient based on an analysis of a photoplethysmographic signal involving the identification of effects associated with the Mayer wave component of the photoplethysmographic signal. In the following discussion, the invention is described in the context of an implementation using components of a conventional pulse oximeter. The present invention is of particular benefit in this regard, since such an implementation improves the functionality of conventional pulse oximeters and provides important physiological parameter information in a cost-effective manner. It should be understood, however, that aspects of the present invention are not limited to such pulse oximeter or any other multi-channel signal implementations, and that the present invention may be implemented with dedicated single or multi-channel photoplethysmographic instruments. Accordingly, the following discussion should be cons...

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Abstract

A method and apparatus are disclosed for using photoplethysmography to obtain physiological parameter information related to respiration rate, heart rate, heart rate variability, blood volume variability and / or the autonomic nervous system. In one implementation, the process involves obtaining (2502) a pleth, filtering (2504) the pleth to remove unwanted components, identifying (2506) a signal component of interest, monitoring (2508) blood pressure changes, monitoring (2510) heart rate, and performing (2512) an analysis of the blood pressure signal to the heart rate signal to identify a relationship associated with the component of interest. Based on this relationship, the component of interest may be identified (2514) as relating to the respiration or Mayer Wave. If it is related to the respiration wave (2516), a respiratory parameter such as breathing rate may be determined (2520). Otherwise, a Mayer Wave analysis (2518) may be performed to obtain parameter information related to the autonomic nervous system.

Description

technical field [0001] The present invention relates generally to monitoring of physiological parameters such as respiration rate or low frequency heart rate / blood volume variability based on light (visible and / or invisible spectrum) signals, and more particularly to monitoring of these parameters based on processing of received light signals , to distinguish effects related to the patient's respiratory system and / or autonomic nervous system. The invention can be easily implemented in conjunction with pulse oximeters to extend the use of these instruments. Background technique [0002] Photoplethysmography involves the use of light signals transmitted through, or reflected from, a patient's blood, such as arterial vessels or perfused tissue, for monitoring physiological parameters of a patient. Such monitoring is possible because the light signal is modulated by interaction with the patient's blood. That is, the interaction with the patient's blood (usually involving wavel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/022A61B5/00A61B5/0205A61B5/024A61B5/0245A61B5/08A61B5/103A61B5/145A61B5/1455
CPCA61B5/0205A61B5/4035A61B5/14551A61B5/1073A61B5/02405A61B5/02416A61B5/0816A61B5/7278
Inventor 安德烈亚斯·L·A·J·德克
Owner DATEX OHMEDA
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