| 摘要 |
The device comprises of a cylindrical body (1) that is divided into sections. Centrally located in the tube is a channel that holds a needle. The needle has a sharpened point at each end. When pressure is placed upon the needle - by it being inserted into a patient, the needle moves slightly allowing the second tip to pierce a seal at the other end of the tube. Behind the seal is a vacuum chamber that once pierced uses the vaccuum pressure to darw blood from the patient into the syringe. |
