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A closed-loop hand prosthesis with simultaneous intraneural tactile and position feedback.

Edoardo D'Anna1, Giacomo Valle2,3, Alberto Mazzoni3

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Researchers developed a new sensory substitution method for transradial amputees, enabling real-time proprioception and tactile feedback. This breakthrough significantly improves prosthesis control and sensory experience, moving towards more advanced bionic limbs.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Medicine

Background:

  • Current myoelectric prostheses lack sensory feedback, leading to overreliance on visual cues.
  • Existing sensory feedback methods provide limited information, notably excluding proprioception.
  • Proprioception, the sense of limb position and movement, is crucial for natural limb control.

Purpose of the Study:

  • To investigate the efficacy of intraneural stimulation-based sensory substitution for delivering real-time position feedback.
  • To assess the simultaneous delivery of proprioceptive and somatotopic tactile feedback.
  • To enhance prosthesis embodiment and function in transradial amputees.

Main Methods:

  • Utilized intraneural stimulation for sensory substitution in two transradial amputees.
  • Delivered real-time position feedback concurrently with somatotopic tactile feedback.
  • Quantified proprioceptive acuity using joint angle reproduction precision and passive movement detection thresholds.

Main Results:

  • Achieved high, near-natural proprioceptive acuity, with median joint angle reproduction precision of 9.1° and passive movement detection threshold of 9.5°.
  • Demonstrated comparable proprioceptive performance to healthy participants.
  • Enabled high-level object discrimination (75.5%) based on size and compliance using simultaneous tactile and position feedback.

Conclusions:

  • Intraneural stimulation-based sensory substitution effectively delivers real-time position feedback alongside tactile information.
  • Transradial amputees can efficiently utilize simultaneous proprioceptive and tactile feedback for improved prosthesis control.
  • This approach represents a significant step towards developing bionic limbs with richer, multimodal sensory capabilities.