Anatomical Model Propulsion System (AMPS)

Anatomical Model Propulsion System (AMPS) www.mobilityrerc.gatech.edu Phuc Dao, MS, Stephen Sprigle, PhD, PT, Jayme Caspall, MS, Aldo Ferri, Phuc Dao, MS, Stephen Sprigle, PhD, PT, Jayme Caspall, MS, Aldo Ferri, PhD, PhD, Matthew Eicholtz, Stan Wang Matthew Eicholtz, Stan Wang Rehabilitation Engineering Research Center on Wheeled Mobility Georgia Institute of Technology, Atlanta, GA Measuring Manual Wheelchair Efficiency PUSHRIM FORCING DESIGN CRITERIA PROJECT GOALS CANONICAL MANEUVERS The goal of this project was to produce a test device and methodology capable of measuring the mechanical efficiency of manual wheelchairs. The result would provide an objective measure of wheelchair performance that are required to effectively prescribe wheelchairs and to code wheelchairs properly for reimbursement. 1) Adjust to different wheelchair configurations (e.g. camber, axle location, pushrim size, wheel dia.,…) 2) Replicate loading as seen by the wheelchair 3) Perform prescribed maneuvers autonomously 4) Manifest human inertial characteristics 5) Measure work input and energy output over time AMPS CHARACTERISTICS Self-contained power and control Direct measurement of tangential force Back & buttock models for realistic load distribution Dimensionally similar to 50% male ATD Adjustable shoulder height Independent wheel control Strategically placed weights approximating body mass distribution Femoral and tibial length adjustment Accelerate from stop to 1.2 m/s in 3 seconds then decelerate to a stop 180º T-turn Reverse turn about left wheel for 90º Stop Forward turn about right wheel for 90º bertson, R.N., et al., Pushrim forces and joint kinetics during wheelchair propulsion. Archives of Physical Medicine and Rehabilitation, 1996. 77(9): p. 856-864. Key measurements for anthropometric similarity: Buttock to Popliteal Length M idshoulder H eight Popliteal H eight Sitting H eight H ip Breadth 19.5 in. 22.9 in. 17.3 in. 35.7 in. 16.3 in. AMPS parameters are derived from ISO 7176-11 100kg dummy and Hybrid III 50% male ATD segment length. Work input and energy output measured over several fundamental maneuvers, e.g. F t x y F r F Elbow Shoulder M wrist ACKNOWLEDGEMENTS This research was conducted as part of the RERC on Wheeled Mobility, which is supported by Grant H133E080003 from the National Institute on Disability and Rehabilitation Research of the U.S. Department of Education. I owe my gratitude to my advisors and the rest of the AMPS team for their continued support and contribution to this project. FUTURE WORK Validate tangential force measurement subsystem Obtain propulsion force profile from SmartWheel Complete AMPS construction Test AMPS over canonical maneuvers to determine figures of merit Fine tune AMPS design and test methodology based on feedbacks from industry advisors

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Anatomical Model Propulsion System (AMPS). Measuring Manual Wheelchair Efficiency. Phuc Dao, MS, Stephen Sprigle, PhD, PT, Jayme Caspall, MS, Aldo Ferri, PhD, Matthew Eicholtz, Stan Wang Rehabilitation Engineering Research Center on Wheeled Mobility - PowerPoint PPT Presentation

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Anatomical Model Propulsion System (AMPS)

www.mobilityrerc.gatech.edu

Phuc Dao, MS, Stephen Sprigle, PhD, PT, Jayme Caspall, MS, Aldo Ferri, PhD,Phuc Dao, MS, Stephen Sprigle, PhD, PT, Jayme Caspall, MS, Aldo Ferri, PhD, Matthew Eicholtz, Stan WangMatthew Eicholtz, Stan Wang

Rehabilitation Engineering Research Center on Wheeled MobilityGeorgia Institute of Technology, Atlanta, GA

Measuring Manual Wheelchair Efficiency

PUSHRIM FORCING

DESIGN CRITERIA

PROJECT GOALS

CANONICAL MANEUVERS

The goal of this project was to produce a test device and methodology capable of measuring the mechanical efficiency of manual wheelchairs. The result would provide an objective measure of wheelchair performance that are required to effectively prescribe wheelchairs and to code wheelchairs properly for reimbursement.

1) Adjust to different wheelchair configurations (e.g. camber, axle location, pushrim size, wheel dia.,…)

2) Replicate loading as seen by the wheelchair

3) Perform prescribed maneuvers autonomously

4) Manifest human inertial characteristics

5) Measure work input and energy output over time

AMPS CHARACTERISTICS

Self-contained power and control

Direct measurement of tangential force

Back & buttock models for realistic load distribution

Dimensionally similar to 50% male ATD

Adjustable shoulder height

Independent wheel control

Strategically placed weights approximating body mass

distribution

Femoral and tibial length adjustment

Accelerate from stop to 1.2 m/s in 3 seconds then decelerate to a stop 180º T-turn

Reverse turn about left wheel for 90º Stop Forward turn about right wheel for 90º

Robertson, R.N., et al., Pushrim forces and joint kinetics during wheelchair propulsion. Archives of Physical Medicine and Rehabilitation, 1996. 77(9): p. 856-864.

Key measurements for anthropometric similarity:Buttock to Popliteal Length

Midshoulder Height

Popliteal Height

Sitting Height

Hip Breadth

19.5 in. 22.9 in. 17.3 in. 35.7 in. 16.3 in.

AMPS parameters are derived from ISO 7176-11 100kg dummy and Hybrid III 50% male ATD segment length.

Work input and energy output measured over several fundamental maneuvers, e.g.

Elbow

Shoulder

Mwrist

ACKNOWLEDGEMENTS

This research was conducted as part of the RERC on Wheeled Mobility, which is supported by Grant H133E080003 from the National Institute on Disability and Rehabilitation Research of the U.S. Department of Education.

I owe my gratitude to my advisors and the rest of the AMPS team for their continued support and contribution to this project.

FUTURE WORK Validate tangential force measurement subsystem Obtain propulsion force profile from SmartWheel Complete AMPS construction Test AMPS over canonical maneuvers to determine figures of merit Fine tune AMPS design and test methodology based on feedbacks from industry advisors