GUIDEWIRE DEVICES HAVING DISTALLY EXTENDING COILS AND SHAPEABLE TIPS
The present disclosure relates to guidewire devices having shapeable tips and effective torquability. A guidewire device includes a core having a proximal section and a tapered distal section. A tube structure is coupled to the core such that the tapered distal section of the core extends into and distally beyond the tube structure. The portion of the core extending distally beyond the tube forms a shapeable tip. One or more coils also extend distally beyond the tube. The tip is configured to reduce the tendency of resilient forces from the tube structure to disrupt a customized shape of the tip.
1 . A guidewire device comprising:
a core having a proximal section and a distal section;
a tube structure coupled to the core such that the distal section of the core passes into the tube structure and passes distally beyond the tube structure;
an outer coil coupled to a distal end of the tube structure and extending distally from the tube structure; and
an inner coil disposed within the tube structure so as to be positioned between an outer surface of the core and an inner surface of the tube structure,
wherein a portion of the inner coil extends distally beyond the tube structure and is encompassed by the outer coil,
wherein the outer coil is formed from a material that is non-radiopaque and that is more plastically deformable than nitinol, and
wherein the inner coil is formed from a radiopaque material.
2 . The guidewire device of claim 1 , wherein the distal section of the core has a smaller diameter than the proximal section.
3 . The guidewire device of claim 2 , wherein the distal section of the core tapers from the proximal section of the core.
4 . The guidewire device of claim 1 , wherein the inner coil being configured in size and shape to abut both an outer surface of the core and an inner surface of the tube structure.
5 . The guidewire device of claim 1 , wherein the outer coil extends distally beyond the tube structure a distance of about 0.5 cm to 5 cm.
6 . The guidewire device of claim 1 , wherein the outer coil extends farther distally than the inner coil.
7 . The guidewire device of claim 1 , wherein the outer coil is formed from stainless steel.
8 . The guidewire device of claim 1 , wherein the tube structure is formed from nitinol and/or the core is formed from stainless steel.
9 . The guidewire device of claim 1 , wherein the tube structure includes a plurality of fenestrations defining a plurality of axially extending beams coupling a plurality of circumferentially extending rings.
10 . The guidewire device of claim 9 , wherein the plurality of fenestrations are arranged into one or more of a one-beam cut pattern, two-beam cut pattern, or three beam-cut pattern.
11 . The guidewire device of claim 9 , wherein the fenestrations define a cut pattern with cuts of increasing depth toward a distal end of the tube structure and/or with spacing between successive cuts that decreases toward a distal end of the tube structure.
12 . The guidewire device of claim 9 , wherein the fenestrations define a distributed cut pattern, an imperfect ramp cut pattern, and/or a sawtooth cut pattern.
13 . The guidewire device of claim 1 , wherein a section of the inner coil extending distally beyond the tube structure comprises a first material, and wherein a section of the inner coil disposed within the tube structure comprises a second, different material.
14 . A guidewire device comprising:
a core having a proximal section and a distal section;
a tube structure coupled to the core such that the distal section of the core passes into the tube structure and passes distally beyond the tube structure;
an inner coil disposed at least partially within the tube structure and extending distally beyond the tube structure; and
an outer coil coupled to a distal end of the tube structure and extending distally from the tube structure, wherein the outer coil encompasses at least a portion of the inner coil extending distally beyond the tube structure,
wherein the inner coil extends farther distally than the outer coil.
15 . The guidewire device of claim 14 , wherein the outer coil is formed from a material that is more plastically deformable than nitinol and/or the inner coil is formed from a radiopaque material.
16 . The guidewire device of claim 14 , wherein the inner coil is configured in size and shape to abut both an outer surface of the core and an inner surface of the tube structure.
17 . The guidewire device of claim 14 , wherein the outer coil extends distally beyond the tube structure a distance of about 0.5 cm to 5 cm.
18 . The guidewire device of claim 14 , wherein the tube structure includes a plurality of fenestrations defining a plurality of axially extending beams coupling a plurality of circumferentially extending rings.
19 . The guidewire device of claim 18 , wherein the plurality of fenestrations are arranged into one or more of a one-beam cut pattern, two-beam cut pattern, or three beam-cut pattern.
20 . The guidewire device of claim 18 , wherein the fenestrations define a cut pattern with cuts of increasing depth toward a distal end of the tube structure and/or with spacing between successive cuts that decreases toward a distal end of the tube structure.