Integrated accelerometry-based Fall Detection and Fall Risk Prediction System Cristina Soaz E-Mail: cristina.soaz@tum.de Room: Z949
Motivation? Life expectancy is growing New care models are needed for the sustanibility of modern society 2
Motivation The European Commission has identified a need for urgent action to shift the focus from acute, reactive and hospital-based care for the elderly to long, proactive and home-based care¹ ¹Steering Group of the European Innovation Partnership on active and healthy ageing. Strategic Implementation Plan for the European Innovation Partnership on Active and Healthy Ageing Nov. 17. 2011 3
Motivation The European Commission has identified a need for urgent action to shift the focus from acute, reactive and hospital-based care for the elderly to long, proactive and home-based care¹ ¹Steering Group of the European Innovation Partnership on active and healthy ageing. Strategic Implementation Plan for the European Innovation Partnership on Active and Healthy Ageing Nov. 17. 2011 Patients with motor disabilities due to diverse patologies, e.g., neurological disease as MS or Parkinson, can benefit also from this new model care. MS patient 4 Reference: Image retrieved from http://www.nationalpost.com/life/chroniccare/focusonms/archive/patient+finds+relief+infusion/3867178/story.html
Overview Fall Risk Assessment Fall Risk Prevention Fall Detection 5
Technology Accelerometer: the actibelt Version actibelt -RCT(Randomized Clinical Trials)/ actibelt -BLU (Bluetooth, atmospheric pressure sensor, temperature sensor) Dimensions 6.7 cm x 4 cm x 1 cm Weight 34 g Battery life > 1 month/ ~3-5 days, depending on bluetooth usage Sampling frequency 100 Hz Storage capacity 500 Mbytes ( = 10 days recording) / Up to 8GB ( = up to 235 days of data) Acceleration range +/- 6 g Connectivity USB 1.1, Bluetooth 2.0, RFID, Radio 2.4GHz 6
Fall Risk Assessment Balance Tests: current methods 7
Fall Risk Assessment Balance Tests: accelerometer solution 8
Fall Risk Assessment Balance Tests: accelerometer solution y z x 9
Fall Risk Assessment Balance Tests: accelerometer solution Postural control strategies: Ankle strategy Hip strategy Step strategy Reference: Winter, David A. "Human balance and posture control during standing and walking." [Image] Gait & Posture 3.4 (1995): 193-214. 10
Fall Risk Assessment Gait Tests: current methods References: http://www.optogait.net/the-system-on-treadmill.html [image] http://now.humboldt.edu/news/campus-concussion-research-asks-subjects-to-walk-the-line/[image] SPPB (short Physical Performance Battery): http://www.grc.nia.nih.gov/branches/ledb/sppb/index.htm [video] 11
Fall Risk Assessment Gait Tests: accelerometer solution 12
Fall Risk Assessment Gait Analysis using a single waist-worn Accelerometer Analogy to ECG Example: muscle contusion Injured Healed 13
Fall Detection Mobile fall alarm systems & acceptance Unconfortable High cost High false alarm rate Out of range Forget to wear it Short battery lifetime Obtrusive Stigmatizes... The alarm lives in my bedroom. It dangles... I don t want it flapping around in front of me. Too big to sort of hang off my wrist...i think, I ve never used it as an alarm because I ve never got it with me when I need it ¹ ¹Kylie Johnston,1 Karen Grimmer-Somers,1 and Michele Sutherland2. Perspectives on use of personal alarms by older fallers. Int J Gen Med. 2010; 3: 231 237. 14
Fall Detection: accelerometer solution 15
Fall Detection: accelerometer solution Fall Cartesian coordinates Backward-forward axis Up-down axis Left-right axis Fall Spherical coordinates 10 seconds ϴGA [degrees] AmplitudeBA [g] 16
Integrated accelerometry-based Fall Detection and Fall Risk Prediction System CAREGIVER WIFI / BLUETOOTH GPRS / UMTS INTERNET BLUETOOTH EMERGENCY CALL CENTER 17