Based on the characteristics of double cavity central venous catheters, Selected the suitable extruding process, and designed the extruding die.

前言： 根据双腔中心静脉导管的特点，选择了合适的导管成型工艺，并设计了挤出机机头的芯模和口模。

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An external layer of compact Bone surrounds a central area of spongy Bone, except at the marrow cavity.

骨的外层为质密的骨皮质，包围着海绵状骨松质中心区（不算骨髓腔）。

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Purpose: To search the value of central venous catheter in the diagnosis and treatment which was placed in serous membrane cavity for the treatment of malignant fluid.

目的应用中心静脉导管对恶性浆膜腔积液的置管，探索其在诊断治疗上的价值。

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