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, the distal section having a smaller diameter than the proximal 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, the inner coil being configured in size and shape to abut and directly contact both the outer surface of the core and the inner surface of the tube structure.
2. The guidewire device of claim 1 , wherein the distal section of the core tapers from the proximal section of the core.
3. 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.
4. The guidewire device of claim 1 , wherein the outer coil is not formed from nitinol.
5. The guidewire device of claim 4 , wherein the outer coil is formed from stainless steel.
6. The guidewire device of claim 1 , wherein a portion of the inner coil extends distally beyond the tube structure and is encompassed by the outer coil.
7. The guidewire device of claim 1 , wherein the inner coil is formed from a material more radiopaque than stainless steel.
8. The guidewire device of claim 7 , wherein the inner coil is formed from platinum.
9. The guidewire device of claim 1 , wherein the tube structure is formed from nitinol.
10. The guidewire device of claim 1 , wherein the core is formed from stainless steel.
11. 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.
12. The guidewire device of claim 11 , 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.
13. The guidewire device of claim 11 , wherein the fenestrations define a cut pattern with cuts of increasing depth toward the distal end of the tube structure and/or with spacing between successive cuts that decreases toward the distal end of the tube structure.
14. The guidewire device of claim 1 , wherein the inner coil and the outer coil are formed from different materials.
15. The guidewire device of claim 1 , wherein the inner coil is formed from a radiopaque material and the outer coil is formed from a non-radiopaque material.
16. A guidewire device comprising:
a core having a proximal section and a distal section, the distal section having a smaller diameter than the proximal 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.
17. The guidewire device of claim 16 , wherein the outer coil is formed from a material that is more plastically deformable than nitinol, the inner coil is formed from a material more radiopaque than stainless steel, or both.
18. The guidewire device of claim 16 , 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.
19. A guidewire device comprising:
a core having a proximal section and a distal section, the distal section having a smaller diameter than the proximal 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 is configured in size and shape to abut and directly contact both an outer surface of the core and an inner surface of the tube structure, and
wherein the inner coil extends farther distally than the outer coil.
20. The guidewire device of claim 19 , wherein the inner coil is formed from a radiopaque material and wherein the outer coil is formed from a non-radiopaque material.