Welded Stent and Stent Delivery System

Patent metadata

Field	Value
Publication number	US-2016167175-A1
Application number	US-201615047675-A
Country	US
Kind code	A1
Filing date	Feb 19, 2016
Priority date	Mar 15, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A welded stent and stent delivery system, with a stent including a first strut having a first strut nickel titanium alloy layer and nickel titanium soluble core, the first strut nickel titanium alloy layer being disposed around the first strut nickel titanium soluble core; and a second strut having a second strut nickel titanium alloy layer and nickel titanium soluble core, the second strut nickel titanium alloy layer being disposed around the second strut nickel titanium soluble core, the second strut nickel titanium alloy layer being connected to the first strut nickel titanium alloy layer with a weld. The first and second strut nickel titanium alloy layers are made of a nickel titanium alloy, the first and second strut nickel titanium soluble cores are made of a nickel titanium soluble material, and the weld is made of an alloy of the nickel titanium alloy and the nickel titanium soluble material.

First claim

1 - 12 . (canceled)

13 : A method of manufacturing a stent comprising:
providing a first strut having in transverse cross section a first strut nickel titanium alloy layer and a first strut nickel titanium soluble core, the first strut nickel titanium alloy layer being disposed around and immediately adjacent to the first strut nickel titanium soluble core, the first strut nickel titanium alloy layer being made of a nickel titanium alloy, the first strut nickel titanium soluble core being made of a nickel titanium soluble material; providing a second strut having in transverse cross section a second strut nickel titanium alloy layer and a second strut nickel titanium soluble core, the second strut nickel titanium alloy layer being disposed around and immediately adjacent to the second strut nickel titanium soluble core, the second strut nickel titanium alloy layer being made of the nickel titanium alloy, the second strut nickel titanium soluble core being made of the nickel titanium soluble material; positioning the first strut adjacent to the second strut at a weld point; at the weld point, melting portions of the first strut nickel titanium alloy layer, the first strut nickel titanium soluble core, the second strut nickel titanium alloy layer, and the second strut nickel titanium soluble core to form a weld pool including the nickel titanium alloy from the first strut nickel titanium alloy layer and the second strut nickel titanium alloy layer, the weld pool further including the nickel titanium soluble material from the first strut nickel titanium soluble core and the second strut nickel titanium soluble core; and cooling the weld pool to form a weld connecting the first strut nickel titanium alloy layer to the second strut nickel titanium alloy layer.

14 : The method of claim 13 wherein the weld further connects the first strut nickel titanium soluble core and the second strut nickel titanium soluble core.

15 : The method of claim 13 further comprising removing the first strut nickel titanium soluble core to form a first strut central void.

16 : The method of claim 15 further comprising filling the first strut central void with a drug.

17 : The method of claim 15 wherein the first strut nickel titanium alloy layer includes perforations between the first strut nickel titanium soluble core and the exterior of the first strut, and the removing comprises removing the first strut nickel titanium soluble core through the perforations.

18 : The method of claim 15 wherein the first strut nickel titanium alloy layer includes an open end to expose the first strut nickel titanium soluble core, and the removing comprises removing the first strut nickel titanium soluble core through the open end.

19 : The method of claim 13 wherein the nickel titanium soluble material is molybdenum, the method further comprising contacting the first strut nickel titanium soluble core with xenon difluoride to form a first strut central void.

20 : The method of claim 13 wherein the nickel titanium soluble material is molybdenum and the weld is a nickel, titanium, and molybdenum alloy.

21 : The method of claim 13 wherein the nickel titanium soluble material is a molybdenum chromium alloy and the weld is a nickel, titanium, molybdenum, and chromium alloy.

22 : The method of claim 13 wherein the nickel titanium soluble material is selected from the group consisting of chromium, molybdenum, iron, cobalt, mixtures thereof, and alloys thereof.

23 : The method of claim 13 wherein the first strut and second strut are part of a single sinusoidal wir

Assignees

• Medtronic Vascular Inc

Inventors

• Thompson Dustin

Classifications

• B23K11/11

  Spot welding · CPC title

• A61F2/86 Primary

  Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure · CPC title

• A61F2002/825

  having longitudinal struts · CPC title

• B23K9/007

  Spot arc welding · CPC title

• B23K26/22

  Spot welding · CPC title