The Study is Being Conducted to Evaluate the Efficacy and Safety of Dexmedetomidine Hydrochloride Microneedles for Preoperative Sedation in Children

Randomized in a 1:1 ratio through the randomization system, and assigned to medium-pressure group or low-pressure group.

"In the high weight group, 8 subjects will receive a high dose of Dexmedetomidine hydrochloride Microneedles.~In the high weight group, 8 subjects will receive a low dose of Dexmedetomidine hydrochloride Microneedles."

In the high weight group, 8 subjects will receive Dexmedetomidine hydrochloride Microneedles blank preparation.

"In the low weight group, 8 subjects will receive a low dose of Dexmedetomidine hydrochloride Microneedles.~In the low weight group, 8 subjects will receive a high dose of Dexmedetomidine hydrochloride Microneedles."

In the low weight group, 8 subjects will receive Dexmedetomidine hydrochloride Microneedles blank preparation.