Applicable to assistive dilation and retraction of various intracranial hematomas (basal ganglia, lobes, thalamus, brainstem, ventricles), various intracranial tumors, hydrocephalus, and trigeminal neuralgia. Traditional treatment of trigeminal neuralgia requires craniotomy. This product can be used to solve the problem of trigeminal neuralgia in the outpatient operating room.