Title:
固定および適応フィルタ処理を用いるフォトプレチスモグラム（ＰＰＧ）からの呼吸
Document Type and Number:
Japanese Patent JP6935441
Kind Code:
B2
Abstract:
Methods and systems for determining a respiration rate (RR) of a subject are disclosed. In one embodiment, a method includes sampling a PPG signal at a first frequency, filtering the PPG signal with a first high-pass filter, receiving an output from the first high-pass filter and filtering the output at a second frequency in a second high-pass filter, counting positive- and negative-edge pulses of a portion of the PPG signal to determine breath-time intervals caused by an influence of the respiration rate on the PPG signal, and determining an average of the breath-time intervals for the positive-edge zero-crossings and the negative-edge zero-crossings to derive an estimate of the RR. In other embodiments, a central frequency of components of the PPG signal is determined based on bandpass filters and a feedback mechanism to estimate β and select an appropriate adaptive filter to determine the RR. Other methods and systems are disclosed.
Inventors:
James E. Darnin
Application Number:
JP2019046529A
Publication Date:
September 15, 2021
Filing Date:
March 13, 2019
Export Citation:
Assignee:
Nonin Medical Incorporated
International Classes:
A61B5/08; A61B5/0295; A61B5/1455
Domestic Patent References:
| JP2016514991A | ||||
| JP2014530057A | ||||
| JP2016531629A | ||||
| JP2008538936A | ||||
| JP2011526517A |
Attorney, Agent or Firm:
Yoshiyuki Osuga
Hiroyoshi Aoki
Amada Masayuki
Hiroyoshi Aoki
Amada Masayuki