| http://www.w3.org/ns/prov#value | - If the placement system according to the invention is used and is not separated from the implant, for example during an operation, such a vascular filter can even be removed again. [0089] A further expedient use of a device and optionally a placement system according to the invention is possible for removal of stones or other agglomerates or foreign bodies from a human or animal body, preferably w
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