Composite wire guide construction
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
Jul 10, 1991
filing date -
Jul 10, 1991
priority date (Note) -
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Abstract
A wire guide construction for medical procedures that involve accessing specific inner body areas without major surgery. The wire guide comprises a mandrel which is a coaxial composite of a thin stainless steel wire radially surrounded by a shape memory alloy, such as a nickel titanium alloy. The mandrel is of a constant diameter over the majority of its length except it is tapered at its distal end to reveal the inner stainless steel wire. A flexible coil of platinum is attached near the distal end of the mandrel and is secured in place when a smoothly rounded tip is welded to the distal tip of the mandrel. The complete wire guide can be coated with a polymer layer, and 70 to 80% of the distal portion of the wire guide can be coated with a hydrophilic polymer to increase lubricity.
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