Bend needle mechanism and looper mechanism are two important mechanisms in blind stitching machine.

弯针机构与成圈叉机构是暗缝缝纫机的两个重要机构。

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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％。

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In this case, no hard steel needle but soft tube is left in the human veins so the vein walls will not be punctured when people physically rotate or bend. The medical incidents are prevented.

这样，留在人的血管中的就没有硬的钢针，只有软管了，人的肢体转动或弯曲时，就不能刺破血管壁，避免了医疗事故的发生。

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And former White House chief of staff and current Chicago Mayor Rahm Emanuel lauded his former boss for having "courage to bend the needle of history and did something presidents have tried to do for 60 years, " he said of broadening health care accessibility.

CNN: Emotions high after Supreme Court upholds health care law

She watched as her grandmother struggled to thread a needle with fingers that were beginning to bend at odd angles, like old trees.

NEWYORKER: The Visitor