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Medical guide wire

  • US 6,648,837 B2
  • Filed: 06/21/2001
  • Issued: 11/18/2003
  • Est. Priority Date: 12/24/1999
  • Status: Expired due to Term
First Claim
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1. A medical guide wire comprising:

  • an elongated flexible core member which is circular in cross section, the core member having a leading end portion fixed to a head plug and also having a rearward portion;

    a helical spring which is concentrically and loosely wound around said core member from the head plug to its rearward portion in the manner that a space appears between said leading end portion and said helical spring;

    said helical spring having a diameter-equally-reduced front portion, a diameter-equally-increased rear portion and a tapered portion between said front and rear portions;

    a gap stopper provided to stop a gap between a halfway portion of said tapered portion of said helical spring and said core member;

    line element turns of said helical spring being tight from said gap stopper to a rearward portion of said helical spring, and line element turns of said helical spring being loose from said gap stopper to the head plug; and

    a blood stream path provided within said helical spring to be directed from said gap stopper to the head plug when said leading end portion reaches a vascular stricture area.

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