An improvement is that the anesthesia needle guiding passage (3) is arranged in a guiding groove (4) on the outer wall of the tube wall.

一种改进是所述麻醉针引导通道(3)是设置于管壁的外壁上的引导槽(4)。

youdao

Conclusion: We use L as arch length and H as chord length to bend syringe needle that is used to posterior superior alveolar nerve block anesthesia by intraoral injection. The success rate is 98%.

结论：以牙槽孔至颧下嵴起始部的弧长和弦长为标准弯制注射针头，采用口内注射法进行上牙槽后神经阻滞麻醉，成功率为98％。

youdao

No surgery, No injection. No needle, No wound, No knife, No anesthesia.

非手术，非注射。无针、无创、无刀、无麻醉、无恢复期。

youdao

Then University of Pennsylvania physiatrist Curtis Slipman persuaded him to try a new 30-minute outpatient procedure that repairs herniated discs using a needle, no general anesthesia required.

FORBES: The Big Hurt

There's no anesthesia involved in the process, although the more needle-phobic might wish otherwise.

FORBES: Facing the Point