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Intuitive Clinician Control Interface for a Powered Knee-Ankle Prosthesis: A Case Study.

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A new clinician control interface (CCI) simplifies configuring powered knee-ankle prostheses. This intuitive tool enables faster, more effective tuning by prosthetists, improving amputee gait symmetry and clinical viability.

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Engineering
  • Prosthetics and Orthotics

Background:

  • Powered knee-ankle prostheses often use complex impedance-based control schemes.
  • Current control parameter tuning is typically performed by engineers or technicians, not certified prosthetists.
  • This process is time-consuming and requires extensive trial-and-error adjustments.

Purpose of the Study:

  • To introduce an intuitive clinician control interface (CCI) for configuring powered knee-ankle prostheses.
  • To enable certified prosthetists to tune prosthesis controllers using a virtual constraint control scheme.
  • To assess the efficiency and effectiveness of the CCI in a clinical setting.

Main Methods:

  • Developed a clinician control interface (CCI) based on a virtual constraint control scheme.
  • The CCI derives virtual constraints from clinician-designed joint kinematic trajectories.
  • A certified prosthetist configured a powered knee-ankle prosthesis for a transfemoral amputee using the CCI during level-ground walking.

Main Results:

  • The CCI allowed a certified prosthetist to tune the powered prosthesis controller in under 10 minutes.
  • This contrasts with the hours typically required for engineers to tune parameters.
  • The tuning process led to improvements in amputee gait outcome metrics, including gait symmetry.

Conclusions:

  • The clinician control interface (CCI) significantly reduces the time and expertise needed for configuring powered knee-ankle prostheses.
  • The CCI empowers certified prosthetists to optimize prosthesis control.
  • These findings suggest the CCI can enhance the clinical adoption and effectiveness of powered lower-limb prostheses.