| 摘要 |
Apparatus for facilitating the exchange of a catheter in the vascular system of a patient without displacing a guidewire which occupies the lumen of the catheter. The apparatus comprises a ferromagnetic rod which preferably defines a plurality of spaced, integral rings of ferromagnetic material distributed along the rod in substantially perpendicular relation to the axis thereof. The rod may be non-magnetized, or it may contain permanent magnets it desired. A connector may be provided for attaching the magnetic apparatus to a guidewire proximal end, or the device may be permanently attached to a guidewire end. A magnetic retainer which provides a magnetic field may be used to hold the ferromagnetic rod and the guidewire in a desired position as the catheter is either advanced or withdrawn while enclosing the ferromagnetic rod, so that the guidewire is retained while neither the guidewire nor the rod can be physically grasped.
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