Chemical composition of the deposity formed on the Lippes loop after prolonged use

Solid incrustations appearing on Lippes loops which had been used from 15-40 months and removed for intractable vaginal bleeding were analysed. The quantity of deposit per loop was 8-10 mg. The constituents of the pooled sample were mainly protein, calcium, magnesium, carbonate, and a trace of iron and phosphate. The cause and significance of the deposits are unexplained in this study.