Intravascular guidewire

Patent metadata

Field	Value
Publication number	US-2018296805-A1
Application number	US-201816015727-A
Country	US
Kind code	A1
Filing date	Jun 22, 2018
Priority date	Feb 28, 2012
Publication date	Oct 18, 2018
Grant date	—

Abstract

A guidewire for use in a medical procedure includes an elongate guide member dimensioned for insertion within a body vessel of a subject. The guide member defines a longitudinal axis and has trailing and leading end segments. The leading end segment has a reduced cross-sectional dimension relative to a cross-sectional dimension of the trailing end segment. The leading end segment includes a first core element comprising a first material and a second core element comprising a second material different from the first material and being forward of the first core element. The first material of the first core element has greater rigidity than the rigidity of the second material of the second core element, to thereby facilitate advancement of, and application of torque to, the leading end segment while minimizing deformation. The first material of the first core element may comprise a nickel-cobalt-chromium alloy or, alternatively, stainless steel. The second material of the second core element comprises a nickel-titanium or an alloy thereof.

First claim

1 - 20 . (canceled)

21 . A guidewire comprising:
an elongate guide member dimensioned for insertion within a body vessel of a subject, the guide member comprising a proximal segment and a distal segment, the distal segment having a reduced cross-sectional dimension relative to a cross-sectional dimension of the proximal segment, the distal segment including:
a first core element comprising a first material; and
a second core element comprising a second material different from the first material, the second core element being distal to the first core element,
wherein a proximal end of the second core element is directly welded to a distal end of the first core element such that the second material of the second core element is directly bonded to the first material of the first core element, the first material of the first core element having greater rigidity than the rigidity of the second material of the second core element.

22 . The guidewire of claim 21 , wherein the first material of the first core element comprises a nickel-cobalt-chromium alloy.

23 . The guidewire of claim 21 , wherein the first material of the first core element comprises stainless steel.

24 . The guidewire of claim 23 , wherein the second material of the second core element comprises an alloy including nickel and titanium.

25 . The guidewire of claim 21 , wherein the distal segment is devoid of any filler material between the proximal end of the second core element and the distal end of the first core element.

26 . The guidewire of claim 21 , further comprising a coil member coaxially mounted about the guide member and dimensioned to longitudinally extend to at least partially encompass and engage with each of the first and second core elements.

27 . The guidewire of claim 26 , wherein the coil member includes a first coil segment and a second coil segment forward of the first coil segment, the first and second coil segments comprising different materials.

28 . The guidewire of claim 26 , wherein the first coil segment has a first torsional strength and the second coil segment has a second torsional strength greater than the first torsional strength.

29 . The guidewire of claim 21 , wherein the distal segment includes at least two tapered segments that taper in outer diameter.

30 . The guidewire of claim 29 , wherein the distal segment includes, from distal to proximal:
a first remote segment; a first tapered segment extending from the first remote segment; a first generally annular segment extending from the first tapered segment; a second tapered segment extending from the first generally annular segment; and a second generally annular segment extending from the second tapered segment.

31 . The guidewire of claim 30 , wherein the first core element is directly welded to the second core element within the second generally annular segment.

32 . The guidewire of claim 30 , wherein the distal segment further comprises:
a third tapered segment extending from the second generally annular segment; and a third generally annular segment that extends from a third tapered segment, wherein the first core element is directly welded to the second core element within the third generally annular segment.

33 . The guidewire of claim 30 , wherein the remote segment defines one of a polygonal cross-section or an annular cross-section.

34 . The guidewire of claim 30 , wherein the remote segment is heat set into a predetermined arcuate configuration.

35 . The guidewire of claim 21 , further comprising a sleeve mounted over at least a major portion of the distal segment.

36 . The guidewire of claim 35 , wherein the sleeve comprises polyurethane and tungsten material.

37 . The guidewire of claim 21 , wherein the first and second core elements do not overlap in an axial direction, the axial direction extending parallel to a longitudinal axis of the elongate guide member.

38 . A guidewire comprising:
an elongate guide member dimensioned for insertion within a body vessel of a subject, the guide member comprising a proximal segment and a distal segment, the distal segment having a reduced cross-sectional dimension relative to a cross-sectional dimension of the proximal segment, the distal segment including:
a first core element comprising a first material; and
a second core element comprising a second material, the first material of the first core element having greater rigidity than a rigidity of the second material of the second core element, wherein the second core element is distal to the first core element,
wherein a proximal-most end of the second core element is directly bonded to a distal-most end of the first core element such that the second material of the second core element is directly bonded to the first material of the first core element.

39 . The guidewire of claim 38 , wherein the first material of the first core element comprises a nickel-cobalt-chromium alloy or stainless steel, and the second material of the second core element comprises an alloy including nickel and titanium.

40 . The guidewire of claim 38 , wherein the proximal-most end of the second core element is bonded to the distal-most end of the first core element through a welding process, the welding process devoid of any filler material.

41 . The guidewire of claim 38 , further comprising a coil member coaxially mounted about the guide member and dimensioned to longitudinally extend to at least partially encompass and engage with each of the first and second core elements.

42 . The guidewire of claim 38 , wherein the first core element is directly welded to the second core element within an annular segment of the guide member.

Assignees

• Covidien Lp

Inventors

• Eskuri Alan

Classifications

• A61M2025/09083

  having a coil around a core · CPC title

• A61M25/09 Primary

  Guide wires · CPC title

• A61M2025/09091

  where a sheath surrounds the coil at the distal part · CPC title

• A61M2025/09133

  having specific material compositions or coatings; Materials with specific mechanical behaviours, e.g. stiffness, strength to transmit torque · CPC title