Composite guidewire

• US 6,595,932 B2
• Filed: 08/02/2002
• Issued: 07/22/2003
• Est. Priority Date: 12/28/1998
• Status: Expired due to Term

• Current Assignee: Micrus Corporation (Johnson & Johnson)
• Original Assignee: Micrus Corporation (Johnson & Johnson)
• Inventors: Ferrera, David A.
• Primary Examiner(s): MARMOR II, CHARLES ALAN
• Application Number:
  US10/211,487
• Publication Number:
  US 20020193706A1
• Time in Patent Office: 354 Days
• Field of Search: 600/433-435, 600/585
• US Class Current: 600/585
• CPC Class Codes: A61M 2025/09091 where a sheath surrounds the coil at the distal part
• CPC Class Codes: A61M 25/09 Guide wires

Abstract

The composite guidewire includes an elongated, flexible core formed from a nickel titanium alloy, with a distal tapered portion, a reinforcement tube disposed over the proximal region of the core, a primary coil disposed over the tapered distal region of the core, and a coating of a heat shrinkable material. A distal tip is secured to the distal end of the core. The proximal reinforcement member has a distal tapered portion, to provide for a transition in stiffness of the guidewire. The heat shrinkable coating is formed from an elongated tube of polytetrafluoroethylene, and the distal primary coil is formed from one or more nickel titanium alloy strands or wires, one or more platinum wires, or a combination. The distal tip may be formed of platinum or a tantalum filled epoxy.

Claims

1. A composite guidewire, comprising:

an elongated, flexible core, said core having proximal and distal regions, with said distal region having a tapered portion;

a reinforcement tube disposed over said proximal region of said core, said reinforcement tube including a distal tapered portion extending over said tapered portion of said elongated, flexible core;

a primary coil disposed over said tapered distal region of said core; and

a coating of a heat shrinkable material disposed over said distal tapered portion of said reinforcement tube.

2. The composite guidewire of claim 1, wherein said elongated, flexible core comprises a rod.

3. The composite guidewire of claim 1, wherein said elongated, flexible core comprises at least one strand.

4. The composite guidewire of claim 1, wherein said elongated, flexible core comprises a hypo tube.