Conclusion Doppler ultrasonic stethoscope-assisted central venous puncture and catheterization is superior to the conventional technique with higher success rate.
2
该示教听诊器在下胶管中都接有一个将主、副耳件及胸件接通的三通接头。
A three-way piece which causes the main ear piece, the auxiliary ear piece and the chest piece to communicate is connected in the bottom rubber pipe of the stethoscope for teaching.
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