Table 2.

Average Mass Changes of All Urinary Tract Device Samples After a 90-Day Trial

Material	Average initial mass (mg)	Average final mass (mg)	Average percent change in mass
Stent	138	231	63.78%
Uncoated Pellethane®	134	149	11.50%
HEMA-Coated Pellethane	140	144.5	2.90%
TETRA-Coated Pellethane	142	143	0.60%

HEMA = 2-hydroxyethyl methacrylate; TETRA = tetraethylene glycol dimethyl ether.