US 12,324,786 B2
Determining chest compression depth using impedance
Ronald Stickney, Edmonds, WA (US)
Assigned to PHYSIO-CONTROL, INC., Redmond, WA (US)
Filed by PHYSIO-CONTROL, INC., Redmond, WA (US)
Filed on Apr. 5, 2021, as Appl. No. 17/222,700.
Claims priority of provisional application 63/005,591, filed on Apr. 6, 2020.
Prior Publication US 2021/0308004 A1, Oct. 7, 2021
Int. Cl. A61H 31/00 (2006.01)
CPC A61H 31/005 (2013.01) [A61H 2201/5023 (2013.01); A61H 2201/5058 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A medical device for indicating a chest compression depth, comprising:
a first electrode assembly structured to be disposed on a chest of a patient;
a second electrode assembly structured to be disposed on a back of the patient;
a processor configured to determine a chest compression depth as a proportion of chest height based on a first impedance measurement between the first electrode assembly and the second electrode assembly when the chest is not compressed and a second impedance measurement between the first electrode assembly and the second electrode assembly when the chest is compressed; and
a user interface configured to receive a patient size, wherein the processor is further configured to determine the chest compression depth as the proportion of chest height based on the received patient size, and wherein the determination comprises:
comparing the received patient size with past patient data stored in a memory,
selecting a constant value corresponding to a proportional relationship between the received patient size and the first and second impedance measurements, the constant value being selected from one or more stored constant values based on the comparison between the received patient size and the past patient data, and
multiplying the constant value with a difference between the first and second impedance measurements.