The hershey halo jig.
The Hershey Halo Jig is a device for simplifying the application of the cranial halo ring. Secured by the patient's own body weight, the jig safely supports both the patient's head and the halo ring, leaving the surgeon's hands free for skull pin insertion. The head support is adjustable allowing cervical spine flexion or extension according to stability requirements. The halo jig significantly increases the speed, accuracy, and safety of halo application.
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Schwentker
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Skinner
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Bowman