A case of nonoperative renal stone extraction through a nephrostomy tract is described. The stone was removed with the aid of a newly constructed device. The advantage of this device over a Dormia stone basket is that it has a steerable tip, which facilitates trapping of the stone in the basket.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/7353580