Monitoring cpr by a wearable medical device

Abstract

A wearable medical device includes a garment configured to be worn about a torso of a patient, at least two sensors for detecting a characteristic of a CPR therapy, an output device, and a processor. The at least two sensors are positioned at locations at the anterior surface of the patient's chest chosen to identify a characteristic of a center of the patient's chest. The processor is configured for processing information from the at least two sensors and providing, to the output device, information about the CPR therapy. The processing includes determining information about a geometry defined by the at least two sensors.

1 . (canceled) 
     
     
         2 . A wearable medical device, comprising:
 a garment configured to be worn about a torso of a patient;   at least two sensors for detecting a characteristic of a CPR therapy, wherein the at least two sensors are positioned at locations at the anterior surface of the patient's chest chosen to identify a characteristic of a center of the patient's chest;   an output device; and   a processor configured for processing information from the at least two sensors and providing, to the output device, information about the CPR therapy, wherein the processing comprises determining information about a geometry defined by the at least two sensors.   
     
     
         3 . The wearable medical device of  claim 2 , wherein the CPR therapy comprises chest compressions. 
     
     
         4 . The wearable medical device of  claim 2 , wherein the CPR therapy comprises ventilations. 
     
     
         5 . The wearable medical device of  claim 2 , wherein the characteristic of the center of the patient's chest comprises a distance between the patient's sternum and the posterior of the patient. 
     
     
         6 . The wearable medical device of  claim 2 , wherein the characteristic of the center of the patient's chest comprises a location above the patient's xiphoid process relative to the posterior of the patient. 
     
     
         7 . The wearable medical device of  claim 2 , comprising two sensors, wherein determining information about the geometry defined by the sensors comprises determining motion of a line defined by the two sensors. 
     
     
         8 . The wearable medical device of  claim 7 , wherein the garment comprises a waistband and two shoulder straps, wherein a first sensor is positioned on the waistband and a second sensor is positioned on one of the two shoulder straps. 
     
     
         9 . The wearable medical device of  claim 2 , comprising three sensors, wherein determining information about the geometry defined by the sensors comprises determining motion of a triangular plane defined by the three sensors. 
     
     
         10 . The wearable medical device of  claim 9 , wherein the garment comprises a waistband and two shoulder straps, wherein a first sensor is positioned on the waistband and a second and third sensor are positioned on the two shoulder straps. 
     
     
         11 . A wearable medical device, comprising:
 a garment configured to be worn about a torso of a patient;   one or more sensors for measuring a characteristic of a CPR therapy;   an output device; and   a processor configured for
 receiving input from a measuring device that is configured for measuring information related to a geometry of the patient's chest prior to initiation of CPR, and 
 providing, to the output device, information about the CPR therapy based on the characteristic of the CPR therapy and the information related to the geometry of the patient's chest. 
   
     
     
         12 . The wearable medical device of  claim 11 , wherein the measuring device comprises one or more accelerometers. 
     
     
         13 . The wearable medical device of  claim 12 , wherein at least one of the one or more accelerometers is configured to measure information related to acceleration in three axes. 
     
     
         14 . The wearable medical device of  claim 12 , wherein at least one of the one or more accelerometers is configured to measure information related to tilt. 
     
     
         15 . The wearable medical device of  claim 11 , wherein the processor is configured to use the information related to the geometry of the patient's chest to generate a 3D representation of the patient's chest prior to initiation of CPR. 
     
     
         16 . The wearable medical device of  claim 11 , wherein the measuring device is configured to measure information indicative of a location of the one or more sensors. 
     
     
         17 . The wearable medical device of  claim 11 , wherein the geometry of the patient's chest comprises transverse diameter of the chest. 
     
     
         18 . The wearable medical device of  claim 11 , wherein the geometry of the patient's chest comprises anterior-posterior diameter of the chest. 
     
     
         19 . The wearable medical device of  claim 11 , wherein the geometry of the patient's chest comprises contours of the chest. 
     
     
         20 . The wearable medical device of  claim 11 , wherein the measuring device comprises one or more cameras. 
     
     
         21 . The wearable medical device of  claim 20 , wherein the one or more cameras are configured to scan a surface of the patient's chest.