The semi-automatic liquid nitrogen extracter is lowcost and easy-to-use, which can prevent the volatilization of the liquid nitrogen during the extraction.

• 摘要介绍一种自制的半自动液氮提取器，该提取器制作成本低廉，操作简单，并可以避免治疗过程中提取液氮时液氮的大量挥发，从而可以减少资源浪费，降低治疗成本。