Apparatus for determining oxygen saturation levels in blood

Details Apparatus for determining oxygen saturation levels in blood Apparatus for determining oxygen saturation levels in blood

1984-06-04

1985-06-11

Wise, Edward J.

Boots, shoes, and leggings

128696, 356 41, A61B 504

Patent

active

045232792

ABSTRACT:
A signal filter method and apparatus for removing portions of a signal indicative of erroneous data, an exemplary apparatus including means for receiving the signal, means for adjusting a threshold by increasing the threshold a first predetermined amount when the signal is in a predetermined relationship with the threshold and for decreasing the threshold a second predetermined amount when the signal is in a second predetermined relationship with the threshold, and means for comparing the signal with the adjusted threshold and for transmitting the signal if the signal bears a first predetermined relationship to the threshold. Disclosed herein are digital and analog implementations of the signal filter method and apparatus, particularly suited for use with catheter-type oximeter apparatus.

REFERENCES:
patent: 3848586 (1974-11-01), Suzuki et al.
patent: 4109643 (1978-08-01), Bond et al.
patent: 4114604 (1978-09-01), Shaw et al.
patent: 4151471 (1979-04-01), Packard et al.
patent: 4167331 (1979-09-01), Nielsen
patent: 4266554 (1981-05-01), Hamaguri

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