Experimental Investigations on Dissolution of Incrustations on the Surface of Catheters (With 1 color plate)

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Abstract
On the basis of a standarized in vitro irrigation model, the incrustation behavior of catheters was investigated using collected urine with controlled contamination (Proteus mirabilis). Irrigation treatment with a NaCl solution did not effectively reduce incrustation compared to the control experiment. On the other hand, incrustations were definitively prevented or existing crystal deposits were largely dissolved with a citrate solution of pH 4.0 (Suby G). Analytical investigations (infrared spectroscopy, scanning electron microscopy) of the deposits on the catheter revealed the presence of struvite (MgNH4PO4 .times. 6H2O), brushite (CaHPO4 .times. 2H2O) and carbonate apatite (Ca10[PO4] [CO3OH]6 [OH]2).

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