Intuitive Control of a Hybrid Prosthetic Leg During Ambulation
Shirley Ryan AbilityLab
20 participants
Dec 1, 2018
INTERVENTIONAL
Conditions
Summary
The objective of this research is to determine the clinical benefits of an innovative and lightweight powered leg controlled using our intent recognition framework in laboratory and community environments.
Eligibility
Inclusion Criteria3
- A unilateral or bilateral lower limb amputation
- K2/K3/K4 ambulator with a prosthesis
- English speaking
Exclusion Criteria3
- Significant new injury that would prevent use of a prosthesis: The ability to consistently wear a prosthesis and perform activities of daily living and specific performance tasks is necessary to evaluate the relative benefits of the interventions.
- Cognitive impairment sufficient to adversely affect understanding of or compliance with study requirements, ability to communicate experiences, or ability to give informed consent: The ability to understand and comply with requirements of the study is essential in order for the study to generate useable, reliable data. The ability to obtain relevant user feedback through questionnaires and informal discussion adds significant value to this study.
- Significant other comorbidity: Any other medical issues or injuries that would preclude completion of the study, use of the prostheses, or that would otherwise prevent acquisition of useable data by researchers.
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Interventions
The Hybrid Knee uses an actively variable transmission in combination of a passive spring/damper system. This allows the motor torque output to be adapted to the requirements of active dynamic tasks - changing the effective transmission ration from zero (fully passive) for level ground walking to a maximum value (fully active) for sit-to-stand transfers. This provides physiological knee torque and speed with a small motor and primary transmission system while also maximizing electrical efficiency, which minimized battery weight. The knee prototype weights 1.7kg. The Semi-active ankle can actively reposition during non-weight bearing phases of gait and uses a non back driveable transmission to maintain its set point during weight bearing activities.
Participants will participate in training sessions of community skills and advanced ambulation training for their home, prescribed passive prosthesis.
Locations(1)
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NCT04038151