guidewire

A wire or spring used as a guide for placement of a larger device or prosthesis, such as a catheter or intramedullary pin.

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guide·wire (gīdґwīr″) a thin, usually flexible wire that can be inserted into a confined or tortuous space to act as a guide for subsequent insertion of a stiffer or bulkier instrument, such as a catheter.

Medical dictionary. 2011.

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