Influence of different magnetic forces on the effect of colonic anastomosis in rats

Table 1 Parameters of the powerful magnet and common magnet

Group	Material (NdFeB)	Size (mm)	Weight (g)	Surfaces modification	MFD (mT)	Magnetic force (N)
						0 mm1	0.5 mm1	1 mm1
Powerful magnet	N52	D = 5	0.44	Nickel coating	421	8.26	5.07	3.44
		H = 3
Common magnet	N35	D = 5	0.40	Nickel coating	283	4.10	2.65	1.78
		H = 3

¹The distance between the working faces of the two magnets. D: Diameter; H: Height; MFD: Magnetic flux density.

Table 2 Sample data and observation index data

	Powerful magnet group	Common magnet group	P value
Subjects, n	12	12	1.00
Gender, n (%)
Male	6 (50)	6 (50)	1.00
Female	6 (50)	6 (50)
Weight (g)	234.3 ± 13.5	233.0 ± 14.4	0.828
Operative time (min)	11.6 ± 2.3	11.8 ± 2.4	0.865
Magnet discharge time (d)	5.3 ± 1.4	5.6 ± 1.1	0.513
Bursting pressure (mmHg)	261.3 ± 6.0	264.3 ± 6.9	0.266
Anastomotic diameter (mm)	5.5 ± 0.4	5.8 ± 0.5	0.095