The sonic separator was a medical device in use in the 2260s.
Issued in the emergency surgical kit of a medical tricorder, Dr. McCoy used the device in 2268 during an operation to return Spock's brain to his body, after Spock suggested he do so. McCoy used it to stimulate the Vulcan's nerve endings to determine which nerves to join together. (TOS: "Spock's Brain")
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