Ureteral stents should be soaked for several minutes before placement

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Table 1 Surface types of ureteral stents and quantities of specimens tested under dry and soaked conditions, respectively

Surface #	M	Type	Amount of samples
Surface #	M	Type	Dry	Soaked
1	1	Raw aliphatic PU	3	5
2	1	PU (“soft”)	1	2
3	2	Phosphorylcholine	2	3
4	1	PU (“strong”)	1	2
5	1	PU (“soft”)	1	2
6	1	PU (“strong”)	1	2
7	4	a-C:H (CF₄)	3	5
8	4	a-C:H (N₂)	3	4
9	4	a-C:H (1)	3	5
10A	4	a-C:H (2)	5	8
10B	5	a-C:H (2)	2	3
11	3	“Soft”-PU	4	5

Surface type (e.g. “soft”, “strong”) according to available manufacturers (M) information. PU = proprietary polyurethane, a-C:H = hydrogenated amorphous carbon deposited from acetylene plasma (CF₄ and N₂ indicate additional process gases, 1 and 2 represent films deposited from pure plasma at different physical conditions). Surfaces #10A and #10B: same coating but different substrate materials.
A reference material (i.e. #1), B different proprietary PU.