Alcoholic injection into the second and third divisions of the trigeminal nerve is a common procedure in all neurosurgical clinics. The success of the procedure and the duration of the relief from pain are entirely dependent on the injection of the alcohol within the nerve itself. The operator is most skilful who can insert the point of the needle within the nerve on the first attempt, without numerous withdrawals and repeated attempts, changing the direction of the needle each time.
It was because of the high percentage of failure of the older method in locating the various landmarks and trying to determine the proper angle by sight that Grant1 originated a more precise method with the aid of a zygometer and a protractor, by the use of which the successful primary results of the alcoholic injections were greatly increased.
After considerable study and dissecting I thought that the improved
Van den Berg WJ. TRIGEMINAL NEURALGIA: A NEW INSTRUMENT FOR ALCOHOLIC INJECTIONS. Arch NeurPsych. 1935;33(2):389–390. doi:10.1001/archneurpsyc.1935.02250140145012
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