Abstract
Objective To determine the magnetic force and magnetic induction intensity of attachments made of NdFeB permanent magnets with different grades. Methods The 4 types of magnetic attachments were included in the study, and divided into 4 groups (A, B, C, D) based on different grades of NdFeB permanent magnets (N45, N48, N50, N52) , respectively; the MagfitDX800 magnetic attachment was included in the control group (E) (n=10 pairs each). All magnetic attachments were structured by cup-shape in the closed magnetic field. The magnetic force and magnetic induction intensity of magnetic attachments in each group were measured and recorded. Results The actually measured magnetic force of the magnetic attachments in groups A, B, C, D and E were (330.83 ± 26.43) gf, (376.17 ± 25.67) gf, (428.87 ± 30.44) gf, (489.30±28.27) gf, (418.53±28.76) gf(1 gf=9.8 mN) , respectively, with overall statistical difference among groups (F=135.424, P<0.001). When all the groups were compared in pairs and determined by LSD test, the maximum magnetic force of the magnetic attachment was found in group D, with statistically significant difference compared with the other 4 groups (all P<0.001) ;the minimum magnetic force of the magnetic attachment was found in group A, with statistically significant difference compared with the other 4 groups (all P<0.001) ; the magnetic force in group B was stronger than that in group A but weaker than those in groups C, D and E (all P<0.001). There was no statistically significant difference in the magnetic force between groups C and E (P=0.155). The magnetic induction intensity of the magnetic attachment surface in each group was less than 400 G, which was consistent with the safety standards of magnetic leakage. Conclusion The new magnetic attachments made of NdFeB N52 as the permanent magnetic material can significantly improve the magnetic force of the magnetic attachments, and is promising for widespread use in clinical practice. Key words: Magnetic attachment; NdFeB magnet; Permanent magnet
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