A retrieval basket comprises a plurality of wires normally encased in a compact form within a sheath whereupon displacement of the sheath to free a portion of the wires enables the wires to form an enlarged retrieval basket. The wires forming the retrieval basket are cold formed in a predetermined...http://www.google.es/patents/US5792145?utm_source=gb-gplus-sharePatente US5792145 - Surgical retrieval baskets
