Mobile application to prompt physical action to measure physiologic response in implantable device

Abstract

A user equipment that includes a touchscreen, and at least one processor configured to generate first timestamp data based upon detection of a first touch event on the touchscreen, and second timestamp data based upon detection of a second touch event on the touchscreen, for calculation by a medical device system of a patient-specific functional status parameter associated with a Sit-To-Stand performance test over a time segment inclusively bounded by a first time defined by the first timestamp data and a second time defined by the second timestamp data.

What is claimed is: 
     
         1 . A system comprising:
 a medical device comprising an accelerometer configured to generate an accelerometer signal; and   processing circuitry configured to:
 output, for display by a computing device, a first prompt for a user to indicate a start of a Sit-To-Stand test; 
 output, for display by the computing device, a second prompt for the user to indicate a completion of the Sit-To-Stand test; 
 receive, from the computing device, first timestamp data indicative of a first user input to the computing device, wherein the first user input indicates the start of the Sit-To-Stand test; 
 receive, from the computing device, second timestamp data indicative of a second user input to the computing device, wherein the second timestamp data indicates the completion of the Sit-To-Stand test; and 
 calculate, based on the accelerometer signal over a time segment inclusively bounded by a first time indicated by the first timestamp data and a second time indicated by the second timestamp data, a patient-specific functional status parameter associated with the Sit-To-Stand test. 
   
     
     
         2 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate rate of change of a segment of the accelerometer signal within the time segment; and   calculate the patient-specific functional status parameter based on the calculated rate of change.   
     
     
         3 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate a definite integral over a segment of the accelerometer signal within the time segment; and   calculate the patient-specific functional status parameter based on the calculated definite integral.   
     
     
         4 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate a length of time of a segment of the accelerometer signal within the time segment; and   calculate the patient-specific functional status parameter based on the calculated length of time.   
     
     
         5 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate a peak amplitude of a segment of the accelerometer signal within the time segment; and   calculate the patient-specific functional status parameter based on the calculated peak amplitude.   
     
     
         6 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate a peak-peak amplitude of a segment of the accelerometer signal within the time segment; and   calculate the patient-specific functional status parameter based on the calculated peak-peak amplitude.   
     
     
         7 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate at least one baseline characteristic from the at least one of the sagittal axis signal, the vertical axis signal and the transverse axis signal, wherein the at least one baseline characteristic is associated with a movement-free sitting position posture; and   calculate the patient-specific functional status parameter based on the at least one baseline characteristic.   
     
     
         8 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate the patient-specific functional status parameter from at least one characteristic of the accelerometer signal over multiple distinct time intervals;   calculate an averaged patient-specific functional status parameter from each interval-specific calculated patient-specific functional status parameter; and   activate the communication circuitry to transmit the averaged patient-specific functional status parameter from the IMD to the computing device.   
     
     
         9 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate a time occurrence of at least one inflection point of the accelerometer signal within the time segment; and   calculate the patient-specific functional status parameter based on the calculated time occurrence.   
     
     
         10 . The system of  claim 1 , wherein the processing circuitry is configured to:
 in response to an activation command, power-on the accelerometer circuitry to generate the accelerometer signal.   
     
     
         11 . The system of  claim 1 , wherein the processing circuitry is configured to:
 in response to a deactivation command, power-down the accelerometer circuitry for a predetermined period of time to conserve power of the IMD.   
     
     
         12 . The system of  claim 1 , wherein the processing circuitry is configured to:
 calculate a symmetry characteristic metric from at least one segment of the accelerometer signal within the time segment, wherein the at least one segment is associated with a Sit-To-Stand or stand-to-sit movement of the Sit-To-Stand test; and   calculate the patient-specific functional status parameter based on the calculated symmetry characteristic metric.   
     
     
         13 . The system of  claim 12 , wherein the processing circuitry is configured to:
 calculate a velocity metric from the accelerometer signal within the time segment to determine an average or instantaneous velocity associated with a Sit-To-Stand or stand-to-sit movement of the Sit-To-Stand test; and   calculate the patient-specific functional status parameter based on the calculated velocity metric.   
     
     
         14 . The system of  claim 12 , wherein the processing circuitry is configured to:
 calculate a distance metric from the accelerometer signal within the time segment to determine a total or intermediate displacement associated with a Sit-To-Stand or stand-to-sit movement of the Sit-To-Stand test; and   calculate the patient-specific functional status parameter based on the calculated distance metric.   
     
     
         15 . The system of  claim 12 , wherein the processing circuitry is configured to:
 calculate a kinetic energy metric from the accelerometer signal within the time segment to determine a total or intermediate energy expenditure associated with a Sit-To-Stand or stand-to-sit movement of the Sit-To-Stand test; and   calculate the patient-specific functional status parameter based on the calculated kinetic energy metric.   
     
     
         16 . The system of  claim 15 , wherein the processing circuitry is configured to:
 calculate a potential energy metric from the accelerometer signal within the time segment and the distance metric to determine a total or intermediate increase or decrease in potential energy associated with a Sit-To-Stand or stand-to-sit movement of the Sit-To-Stand test; and   calculate the patient-specific functional status parameter based on the calculated potential energy metric.   
     
     
         17 . The system of  claim 12 , wherein the processing circuitry is configured to:
 calculate a derivative metric from a segment of the accelerometer signal within the time segment to determine erratic movement associated with a Sit-To-Stand or stand-to-sit movement of the Sit-To-Stand test; and   calculate the patient-specific functional status parameter based on the calculated derivative metric.   
     
     
         18 . A method comprising:
 outputting, by processing circuitry for display by a computing device, a first prompt for a user to indicate a start of a Sit-To-Stand test;   outputting, by the processing circuitry for display by the computing device, a second prompt for the user to indicate a completion of the Sit-To-Stand test;   receiving, by the processing circuitry from the computing device, first timestamp data indicative of a first user input to the computing device, wherein the first user input indicates the start of the Sit-To-Stand test;   receiving, by the processing circuitry from the computing device, second timestamp data indicative of a second user input to the computing device, wherein the second timestamp data indicates the completion of the Sit-To-Stand test; and   calculating, by the processing circuitry based on an accelerometer signal over a time segment inclusively bounded by a first time indicated by the first timestamp data and a second time indicated by the second timestamp data, a patient-specific functional status parameter associated with the Sit-To-Stand test.   
     
     
         19 . The method of  claim 18 , further comprising:
 calculating, by the processing circuitry, a rate of change of a segment of the accelerometer signal within the time segment; and   calculating, by the processing circuitry, the patient-specific functional status parameter based on the calculated rate of change.   
     
     
         20 . The method of  claim 18 , further comprising:
 calculating, by the processing circuitry, a definite integral over a segment of the accelerometer signal within the time segment; and   calculating, by the processing circuitry, the patient-specific functional status parameter based on the calculated definite integral.