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Balloon dilation catheter with improved pushability, trackability and crossability

  • US 5,549,552 A
  • Filed: 03/02/1995
  • Issued: 08/27/1996
  • Est. Priority Date: 03/02/1995
  • Status: Expired due to Term
First Claim
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1. A medical system, comprising:

  • a. an over-the-wire type balloon catheter, the catheter comprising;

    i. a polymer outer tube having a proximal end and a distal end;

    ii. an elongate inner tube having a metallic proximal portion, a polymer distal portion and a guide wire lumen extending therethrough, the guide wire lumen having a minimum inside diameter, the inner tube being coaxially disposed within the outer tube to define an annular inflation lumen therebetween, wherein the distal portion of the metallic inner tube and the proximal portion of the polymer inner tube are connected at a junction;

    iii. a flexible transition member traversing the junction, the flexible transition member having a proximal end and a distal end, wherein one end is free and the other end is fixed; and

    iv. an inflatable balloon having a proximal end, a distal end and an interior, the proximal end of the balloon connected to a distal end of the distal portion of the inner tube, the proximal end of the balloon connected to the distal end of the outer tube, the interior of the balloon being in fluid communication with the inflation lumen; and

    b. a guide wire removably disposed in the guide wire lumen, the guide wire having a maximum outside diameter which is less than the minimum inside diameter of the guide wire lumen.

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