Development of a battery-free ultrasonically powered functional electrical stimulator for movement restoration after paralyzing spinal cord injury.
Monzurul Alam, Shuai Li, Rakib Uddin Ahmed and 6 others
PMID 30850027WHAT IT FOUND
A battery-free implant powered by external ultrasound stimulated leg muscles in three paralyzed rats.
The device generated movement comparable to standard electrical stimulators, but this is a pre-clinical engineering test, not evidence of human efficacy.
Key findings
01The prototype stimulator successfully induced hindleg movement in anesthetized rats with spinal cord injury using ultrasound power.
02The muscle force generated by the ultrasonically powered stimulator was similar to that of a conventional electrical stimulator.
03The device harvested 5.95 mW of electric power from an external acoustic intensity of 379.92 mW/cm² at an 8-mm depth under rat skin.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was conducted in only three anesthetized rats, not in humans or awake subjects. The results are from an acute experiment and do not demonstrate long-term safety, biocompatibility, or functional recovery in a real-world setting. The device was tested in a controlled laboratory setup with precise alignment between the ultrasound probe and the implant, which may be difficult to maintain in human patients. The paper reports engineering feasibility, not clinical efficacy for movement restoration.
Declared interests
Funding was provided by the Innovation and Technology Commission (Hong Kong), the Guangdong Provincial Work Injury Rehabilitation Center, and The Hong Kong Polytechnic University.
The easy way to misread this
Do not interpret this as a new treatment available for patients. This is an engineering prototype tested in three anesthetized rats; it has not been tested in humans, and its ability to restore functional movement in people with spinal cord injury is unproven.