US 12,350,012 B2
Using PH and SMO2 from a spectral sensor as an indication of subject down time
Gary A. Freeman, Waltham, MA (US); Ulrich Herken, Medford, MA (US); Christopher L. Kaufman, Somerville, MA (US); and Annemarie Elizabeth Silver, Bedford, MA (US)
Assigned to ZOLL Medical Corporation, Chelmsford, MA (US)
Filed by ZOLL Medical Corporation, Chelmsford, MA (US)
Filed on Mar. 5, 2020, as Appl. No. 16/810,019.
Application 16/810,019 is a continuation of application No. 15/076,192, filed on Mar. 21, 2016, granted, now 10,617,347.
Claims priority of provisional application 62/137,756, filed on Mar. 24, 2015.
Prior Publication US 2020/0305722 A1, Oct. 1, 2020
Int. Cl. A61B 5/0205 (2006.01); A61B 5/00 (2006.01); A61B 5/1455 (2006.01); A61F 7/00 (2006.01); A61N 1/39 (2006.01); G01J 3/36 (2006.01); A61B 5/145 (2006.01); A61H 31/00 (2006.01)
CPC A61B 5/0075 (2013.01) [A61B 5/14551 (2013.01); A61B 5/7282 (2013.01); A61F 7/00 (2013.01); A61N 1/3987 (2013.01); G01J 3/36 (2013.01); A61B 5/14535 (2013.01); A61B 5/14539 (2013.01); A61B 5/746 (2013.01); A61F 2007/0093 (2013.01); A61H 31/005 (2013.01); A61H 31/006 (2013.01); A61H 31/008 (2013.01); A61H 2201/10 (2013.01); A61H 2201/1207 (2013.01); A61H 2201/5007 (2013.01); A61H 2201/5025 (2013.01); A61H 2201/5043 (2013.01); A61H 2201/5058 (2013.01); A61H 2201/5082 (2013.01); A61H 2230/00 (2013.01); A61H 2230/201 (2013.01); A61H 2230/203 (2013.01); A61H 2230/206 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A patient monitoring system for assisting treatment of a patient experiencing a cardiac arrest event, the patient monitoring system comprising:
an external defibrillator configured to administer defibrillation therapy on the patient;
a spectral sensor assembly comprising at least one of a muscle oxygen saturation sensor, a pH sensor, a blood hematocrit sensor, a carbon dioxide sensor, or a pulse oximetry sensor, wherein the spectral sensor assembly is configured to be placed on a skin of the patient and configured to obtain spectroscopic data concerning the patient's blood oxygenation continuously during a period of time;
a display for presenting physiological information regarding the patient; and
at least one processor communicably coupled to the spectral sensor assembly and the display, wherein the at least one processor is configured to:
obtain the spectroscopic data using the spectral sensor assembly,
process the spectroscopic data to determine tissue oxygen saturation of the patient,
compare the determined tissue oxygen saturation of the patient to a mathematical model, wherein the mathematical model represents a plurality of tissue oxygen saturation measurements obtained from a group of subjects having similar demographics and similar physiological characteristics as the patient,
determine, based on the comparison between the determined tissue oxygen saturation of the patient to the mathematical model representing the plurality of tissue oxygen saturation measurements obtained from the group of subjects having similar demographics and similar physiological characteristics as the patient, that the patient experienced the cardiac arrest event at a first time,
determine an elapsed time since the first time,
provide, using the display, an indication of the elapsed time to a user,
determine, based on the elapsed time, whether to (i) administer the defibrillation therapy on the patient using the external defibrillator, or (ii) administer cardiopulmonary resuscitation (CPR) on the patient without administering the defibrillation therapy,
present, using the display, an indication whether to (i) administer the defibrillation therapy on the patient using the external defibrillator, or (ii) administer CPR on the patient without administering the defibrillation therapy,
responsive to determining to administer the defibrillation therapy on the patient using the external defibrillator, cause the external defibrillator to administer the defibrillation therapy on the patient;
determine, based on the spectroscopic data, an effectiveness of a treatment of the patient during the period of time, and
present, using the display, an indication the effectiveness of the treatment of the patient during the period of time, including at least one of (i) an indication to continue administering CPR to the patient or (ii) an indication to discontinue administering CPR to the patient and administer an alternative treatment to the patient.