Intuitive Control of a Hybrid Prosthetic Leg During Ambulation
Shirley Ryan AbilityLab
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.
Description
The hypothesis of this study is that using the Hybrid Leg with seamless, automatic transitions will result in participants choosing to become more active and improve their community participation compared to when using their own passive prosthetic leg. The Hybrid Leg is an an innovative and lightweight powered leg that has 2 operating modes: active and passive. When in active mode, the Hybrid Leg is capable of supplying 120 NM of knee torque and actively repositioning the ankle during non-weight bearing phases of gait. When in passive mode, the motor and transmission are decoupled from the kn…
Eligibility
- Age range
- 18–95 years
- Sex
- All
- Healthy volunteers
- No
Inclusion Criteria: * A unilateral or bilateral lower limb amputation * K2/K3/K4 ambulator with a prosthesis * English speaking Exclusion Criteria: * 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 u…
Interventions
- DeviceHybrid Leg
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.
- DevicePrescribed Passive Prosthesis
Participants will participate in training sessions of community skills and advanced ambulation training for their home, prescribed passive prosthesis.
Location
- Shirley Ryan AbilityLabChicago, Illinois