US 12,109,012 B2
Plethysmograph variability processor
Ammar Al-Ali, San Juan Capistrano, CA (US); Walter M. Weber, Laguna Hills, CA (US); and Anmol B. Majmudar, Irvine, CA (US)
Assigned to Masimo Corporation, Irvine, CA (US)
Filed by Masimo Corporation, Irvine, CA (US)
Filed on Jan. 12, 2022, as Appl. No. 17/647,819.
Application 17/647,819 is a continuation of application No. 16/126,523, filed on Sep. 10, 2018, granted, now 11,229,374.
Application 16/126,523 is a continuation of application No. 13/858,249, filed on Apr. 8, 2013, granted, now 10,092,200, issued on Oct. 9, 2018.
Application 13/858,249 is a continuation of application No. 11/952,940, filed on Dec. 7, 2007, granted, now 8,414,499, issued on Apr. 9, 2013.
Claims priority of provisional application 60/998,782, filed on Oct. 12, 2007.
Claims priority of provisional application 60/873,663, filed on Dec. 9, 2006.
Prior Publication US 2022/0240801 A1, Aug. 4, 2022
Int. Cl. A61B 5/00 (2006.01); A61B 5/02 (2006.01); A61B 5/024 (2006.01); A61B 5/026 (2006.01); A61B 5/0295 (2006.01); A61B 5/1455 (2006.01); G16H 50/20 (2018.01)
CPC A61B 5/0295 (2013.01) [A61B 5/02416 (2013.01); A61B 5/0261 (2013.01); A61B 5/14551 (2013.01); A61B 5/4848 (2013.01); A61B 5/7278 (2013.01); G16H 50/20 (2018.01)] 6 Claims
OG exemplary drawing
 
1. A computerized plethysmograph variability method using a signal processor comprising:
receiving a data signal from a physiological sensor coupled to a patient;
generating a plethysmograph waveform based at least in part on the data signal, wherein the plethysmograph waveform comprises a plurality of pulses corresponding to pulsatile blood flow within tissue of the patient;
accumulating, in a first buffer, a plurality of perfusion values corresponding to the plurality of pulses, the plurality of perfusion values derived based on the plurality of pulses;
determining if a sufficient amount of physiologically acceptable data is in the first buffer based at least on a length of a respiration cycle of the patient, wherein the signal processor is configured to perform specific operations when there is sufficient amount of data and when there is insufficient amount of data in the first buffer over time;
in response to determining that sufficient amount of data is in the first buffer for a specific period of time:
determining a plurality of variability values each indicative of variability of a series of the plurality of perfusion values;
calculating a plethysmograph variability index representative of the plurality of variability values; and
displaying the calculated plethysmograph variability index; and
in response to determining that insufficient amount of data is in the first buffer for the specific period of time:
displaying a previously calculated plethysmograph variability index stored in the signal processor.