The needle knife body and the needle knife head are made of a paramagnetic metal material, and a layer of diamagnetic metal material coat is coated on the paramagnetic metal material.
所述针刀身和针刀头由顺磁性金属材料制成；并且，所述顺磁性金属材料之上涂覆有一层反磁性金属材料涂层。
The needle knife body and the needle knife head are made of a paramagnetic metal material, and a layer of diamagnetic metal material coat is coated on the paramagnetic metal material.
所述针刀身和针刀头由顺磁性金属材料制成；并且，所述顺磁性金属材料之上涂覆有一层反磁性金属材料涂层。
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