Medical instrument with controlled torque transmission
First Claim
1. A method for treating an elongated metallic medical instrument, comprising:
- subjecting a plurality of selected and separated sections of a normally tempered medical instrument to a heat treating process,wherein the heat treating process is a localized annealing process selected from one of RF heating or induction heating,thereby altering the torque characteristics of the plurality of selected and separated sections,wherein the plurality of selected sections of the medical instrument are adjacent to and separated from one another by a plurality of unselected sections that are not subjected to the heat treating process.
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Accused Products
Abstract
A medical instrument such as a guidewire that is designed to have controlled torque transmission along its length. Specially treated areas are placed in selected and equal areas along the entire length of the elongated shaft of the medical instrument, and are separated from one another by untreated areas. This process ensures that any torque is transmitted distally, in a smooth manner, regardless of the guidewire position, thus resulting in a substantial reduction in whipping. In one embodiment, a stainless steel guidewire is utilized, and is subjected to annealing heat treatment in selected areas. This annealing process creates a mandrel that has repeated temper properties along its length. Torque applied at one end of this mandrel is transmitted to the opposite end in an even and controlled manner, even when the mandrel is formed into a loop.
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Citations
11 Claims
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1. A method for treating an elongated metallic medical instrument, comprising:
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subjecting a plurality of selected and separated sections of a normally tempered medical instrument to a heat treating process, wherein the heat treating process is a localized annealing process selected from one of RF heating or induction heating, thereby altering the torque characteristics of the plurality of selected and separated sections, wherein the plurality of selected sections of the medical instrument are adjacent to and separated from one another by a plurality of unselected sections that are not subjected to the heat treating process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification