Physicians: Myoelectric Controlled Upper Extremity Powered Orthosis


The MyoPro® is designed to enable individuals to support a weak or deformed arm. Patients can self-initiate and control movement of a partially paretic limb using their own myoelectric signals. Similar to a myoelectric controlled prosthetic, the orthosis utilizes surface EMG sensing technology. When the user tries to innervate their extremity, sensors in the orthosis detect the weak myoelectric signal, which activates the motor to move the extremity in the desired direction. The user is completely controlling their own extremity; the orthosis assists with movement once a signal is detected. With the orthosis, an individual with a paretic arm can perform functional tasks including feeding, reaching, and lifting.

Clinical Benefit

Orthotic and Prosthetic practices across the U.S. currently fit patients with the MyoPro to support a patient's weak or deformed arm to enable functional activities. The MyoPro is designed for ease of use, enabling patients to don and operate it at home. Clinical benefits include achieving gross motor functional goals as well as limiting comorbidities such as spasticity, edema, weakness and synergistic or compensatory movement patterns.
Examples of Functional Goals:
  • Feeding - User can hold food down with fork attachment while cutting with non-affected side, improvement in hand to mouth motion
  • Carrying objects (bilaterally or unilaterally) - Laundry basket, purse
  • Safety - User can carry objects in affected side while allowing non-affected side to stabilize or use their walking aid throughout task

Limiting comorbidities by restoring active movement to the impaired extremity results in:
  • Volitional control over spasticity
  • Increased active and passive ROM
  • Increased strength
  • Reduced need for spasticity medications
  • Improved coordination of arm movement and isolation of bicep and triceps
  • Arm weakness or paralysis due to CVA, TBI, SCI, other CNS impairment
  • Full Passive Range of Motion, Some Active Range of Motion
  • May have mild to moderate flexor tone
  • May have some shoulder subluxation
  • User is motivated to use the device for functional tasks
Disqualifying Conditions
  • Shoulder dislocation or subluxation of 3 fingers
  • Severe Pain in shoulder or arm
  • Elbow Contracture or acute injury in the arm
  • Unable to follow simple, 3-step directions
  • Flexor tone greater than a 3 on the Modified Ashworth Scale

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