发明名称 |
Method and apparatus for reducing ambient noise effects in electronic monitoring instruments |
摘要 |
The present invention provides a method and apparatus for adapting to noise sources affecting a pulse oximeter. Various available frequencies are evaluated to determine their respective noise levels and one is selected to act as the operating demultiplexer frequency. During normal operation of the pulse oximeter, the various available demultiplexer frequencies are periodically scanned to determine which has the lowest associated noise. The noise level associated with the operating frequency is used to determine the signal-to-noise ratio of the pulse oximeter signals and thereby qualify certain signals from the pulse oximeter. Those pulses associated with a signal-to-noise ratio below a predetermined threshold are rejected and excluded from use in calculating blood oxygen saturation.
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申请公布号 |
US5713355(A) |
申请公布日期 |
1998.02.03 |
申请号 |
US19960637002 |
申请日期 |
1996.04.18 |
申请人 |
NELLCOR PURITAN BENNETT INCORPORATED |
发明人 |
RICHARDSON, CHARLES A.;BERNSTEIN, MICHAEL;OKIKAWA, JERRY K.;BENNETT, TERRENCE R. |
分类号 |
A61B5/145;A61B5/00;A61B5/024;A61B5/1455;(IPC1-7):A61B5/00 |
主分类号 |
A61B5/145 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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