Guidewire devices having shapeable tips and bypass cuts
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 extends into the tube structure. The tube structure includes a plurality of bypass cuts formed tangentially within the tube structure to increase the flexibility of the tube structure and to reduce the tendency of resilient forces from the tube structure to disrupt a shaped distal tip of the guidewire device.
1. A guidewire device having a shapeable tip, the guidewire device comprising:
a core having a proximal section and a distal section; and
a tube structure coupled to the core such that the distal section of the core passes into the tube structure, the tube structure having a first section and a second section distal to the first section,
wherein the tube structure includes a cut pattern which forms a plurality of axially extending beams coupling a plurality of circumferentially extending rings,
wherein the cut pattern forms a single beam between each pair of adjacent rings within the second section, the beams in the second section forming a preferred bending plane,
wherein a thickness of a most proximal ring of the second section is greater than a thickness of a most distal ring of the first section,
wherein at least a portion of the distal section of the core passing through the second section of the tube is a flat ribbon having a major plane lying substantially perpendicular to the preferred bending plane, and
wherein a distal tip of the guidewire device is configured to be manually shapeable, wherein a stiffness of the tube structure is continuous across a transition between the first and second sections.
2. The guidewire device of claim 1 , wherein the second section is between about 0.5 cm and 5 cm in length.
3. The guidewire device of claim 1 , wherein the second section is between about 1 cm and 2 cm in length.
4. The guidewire of claim 1 , wherein the beams between rings in the second section alternate in position from a first side of the tube structure to a second side of the tube structure, the second side being opposite the first side by about 180 degrees.
5. The guidewire of claim 1 , wherein the beams between rings in the second section are aligned on a single side of the tube structure to form a backbone of aligned beams connecting the plurality of rings within the second section.
6. The guidewire device of claim 1 , further comprising a coil disposed within the tube structure so as to be positioned between an outer surface of the distal section of the core and an inner surface of the tube structure.
7. The guidewire device of claim 1 , wherein the first section has a cut pattern of two or more beams between adjacent rings.
8. The guidewire device of claim 1 , wherein the tube structure is formed from a superelastic material.
9. The guidewire device of claim 1 , wherein the second section includes an intermediate point, and wherein the rings of the second section proximal of the intermediate point have an average ring thickness that is greater than an average ring thickness of the rings of the second section distal of the intermediate point.
10. The guidewire device of claim 1 , wherein the tube structure further comprises a third section distal to the second section, and wherein the third section of the tube structure includes two or more beams between adjacent rings.
11. The guidewire device of claim 10 , further comprising an adhesive disposed at the distal end of the tube structure that couples the tube structure to the core.
12. The guidewire device of claim 11 , wherein the adhesive extends into the tube and between two or more rings in the third section of the tube structure.
13. A guidewire device having a shapeable tip, the guidewire device comprising:
a core having a proximal section and a distal section; and
a tube structure coupled to the core such that the distal section of the core passes into the tube structure, the tube structure having a first section and a second section distal to the first section,
wherein the tube structure includes a cut pattern which forms a plurality of axially extending beams coupling a plurality of circumferentially extending rings,
wherein the cut pattern forms a single beam between each pair of adjacent rings within the second section, the beams in the second section forming a preferred bending plane,
wherein a thickness of a most proximal ring of the second section is greater than a thickness of a most distal ring of the first section,
wherein at least a portion of the distal section of the core passing through the second section of the tube is a flat ribbon having a major plane lying substantially perpendicular to the preferred bending plane, wherein a stiffness of the tube structure is continuous across a transition between the first and second sections.
14. The guidewire device of claim 13 , wherein the beams between rings in the second section alternate in position from a first side of the tube structure to a second side of the tube structure, the second side being opposite the first side by about 180 degrees.
15. The guidewire device of claim 13 , wherein the beams between rings in the second section are aligned on a single side of the tube structure to form a backbone of aligned beams connecting the plurality of rings within the second section.
16. The guidewire device of claim 13 , wherein the first section has a cut pattern of two or more beams between adjacent rings.
17. The guidewire device of claim 13 , wherein the tube structure further comprises a third section distal to the second section, and wherein the third section of the tube structure includes two or more beams between adjacent rings.
18. The guidewire device of claim 17 , further comprising an adhesive disposed at the distal end of the tube structure that couples the tube structure to the core.
19. The guidewire device of claim 18 , wherein the adhesive extends into the tube and between two or more rings in the third section of the tube structure.