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Deformable tip for stent delivery and methods of use

  • US 10,258,491 B2
  • Filed: 01/30/2017
  • Issued: 04/16/2019
  • Est. Priority Date: 02/02/2016
  • Status: Active Grant
First Claim
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1. A stent-delivery assembly comprising:

  • a catheter configured to deliver a stent at a distal end thereof and having a first longitudinal passage at the distal end and a catheter inner diameter;

    an expandable stent movable, relative to the catheter, from a first position to a second position, the expandable stent having a second longitudinal passage and a stent inner diameter; and

    a guidewire assembly extending through the first longitudinal passage and through the second longitudinal passage, the assembly movable, relative to the distal end of the catheter, from a third position to a fourth position, the guidewire assembly comprising;

    an inner lumen having an exterior surface; and

    a radially adjustable tip concentrically disposed about the exterior surface of the inner lumen and comprising;

    a first end that is tapered towards the inner lumen and that is coupled to the inner lumen;

    an opposing second end; and

    a radially adjustable middle portion;

    wherein when the stent is in the first position, the stent is concentrically disposed within the first longitudinal passage and has a first stent inner diameter;

    wherein when the stent is in the second position, the stent is spaced longitudinally from the first longitudinal passage of the catheter and has a second stent inner diameter that is greater than the first stent inner diameter;

    wherein when the guidewire assembly is in the third position, the inner lumen is under tension, the opposing second end extends within the first longitudinal passage and the second longitudinal passage, and a portion of the radially adjustable middle portion of the tip has a first tip outer diameter that is greater than or equal to the catheter inner diameter; and

    wherein when the guidewire assembly is in the fourth position, the opposing second end of the tip is spaced longitudinally from the first longitudinal passage of the catheter and the adjustable middle portion of the tip has a second tip outer diameter that is less than the first tip outer diameter and less than the second stent inner diameter.

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