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Medical guidewire

  • US 4,934,380 A
  • Filed: 11/23/1988
  • Issued: 06/19/1990
  • Est. Priority Date: 11/27/1987
  • Status: Expired due to Term
First Claim
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1. A medical guidewire having an elongated body that has a first flexibility and a distal tip region of a second, relatively greater flexibility, said guidewire comprisinga core having a body portion of a first diameter, a distal portion terminating in a relatively smaller diameter, and a distal end portion, said distal end portion disposed in a distal tip region and spaced proximally from a round tip element that defines a distal end of said guidewire, said distal portion being formed of nitinol,a first coil joined to the body portion of said core at its proximal end at coupling means and extending along said core to a termination point in said distal tip region, proximal of the end portion of the core,a relatively more flexible second coil has a proximal end joined to said first coil and has a distal end joined to the round tip element,a safety wire secured to said core, said safety wire having a generally flat distal end portion within said second coil, joined to said round tip element,a transition wire secured to said core, said transition wire having a generally flat distal end portion disposed to terminate within said second coil intermediate of the distal end portions of said core and of said safety wire, said safety wire and said transition wire being secured to said coupling means.

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