Experimental investigations on dissolution of incrustations on the surface of catheters.
On the basis of a standardized 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 x 6H2O), brushite (CaHPO4 x 2H2O) and carbonate apatite (Ca10[PO4] [CO3OH]6[OH]2).
Hesse
A
A
Experimental Urology Department, University of Bonn, FRG.
Schreyger
F
F
Tuschewitzki
G J
GJ
Classen
A
A
Bach
D
D
D002408:Catheters, Indwelling; D002951:Citrates; D003460:Crystallization; D006801:Humans; D008297:Male; D012965:Sodium Chloride; D007507:Therapeutic Irrigation / Q000379:methods*; D014556:Urine
D002951:Citrates; D012965:Sodium Chloride