Vaso-occlusive delivery device with kink resistant, flexible distal end
View Patent ↗A device for delivering an occlusive element includes an elongate sheath having a lumen therein. An elongate core member is disposed within the lumen and is formed from a proximal portion and distal portion connected via a joint. The distal portion of the elongate member includes a severable junction secured to the occlusive element. A marker coil is coaxially arranged around the distal portion of the elongate core member and is partially disposed inside the sheath lumen. A coil member is coaxially arranged around the distal portion of the elongate core member and coaxially arranged around at least a portion of the marker coil extending outside the lumen of the sheath. The coil member is secured at a distal end thereof to the distal portion of the elongate core member. The device resists axial compression while allowing for radial bending.
1. A vaso-occlusive assembly, comprising:
an elongate sheath having a wall and defining an axial lumen;
respective proximal and distal elongate core members disposed within the lumen of the sheath, wherein the proximal elongate core member is joined to the distal elongate core member at a joint located within the sheath lumen, the distal elongate core member including a severable junction;
a marker coil coaxially arranged around the distal elongate core member and partially disposed within the lumen of the sheath;
a coil member coaxially arranged around the distal elongate core member and further coaxially arranged around at least a portion of the marker coil, the coil member further being secured at a distal end thereof to the distal elongate core member; and
a vaso-occlusive coil coupled to the distal elongate core member at a location distal to the severable junction.
2. The assembly of claim 1 , wherein the distal elongate core member includes a hook that is secured to one or more proximal windings of the vaso-occlusive coil.
3. The assembly of claim 2 , wherein the interface between the hook and the one or more proximal windings of the vaso-occlusive coil is covered with an adhesive.
4. The assembly of claim 2 , wherein the one or more proximal windings are crimped about a portion of the hook.
5. The assembly of claim 2 , further comprising a stretch resistant filament secured at one end to the hook and at another end to the vaso-occlusive coil.
6. The assembly of claim 1 , further comprising a delivery catheter defining an axial lumen, the vaso-occlusive assembly being slidable through the lumen of the delivery catheter.
7. The assembly of 1 , wherein the coil member is secured to the distal elongate core member via a stopper coil and adhesive.
8. The assembly of claim 1 , wherein the joint is contained within a segment of hypotube.
9. A vaso-occlusive assembly, comprising:
an elongate sheath having a wall and defining an axial lumen therethrough;
an elongate core member disposed within the lumen of the sheath, the elongate core member including a proximal portion joined to a distal portion at a joint, the distal portion including a severable junction;
a spacer member coaxially arranged around the distal portion of the elongate core member and disposed within the lumen of the sheath at a location distal to the joint;
a marker coil coaxially arranged around the distal portion of the elongate core member and disposed within the lumen of the sheath at a location distal to the spacer member;
a coil member coaxially arranged around the distal portion of the elongate core member and at least a portion of the marker coil, the coil member further being secured at a distal end thereof to the distal portion of the elongate core member; and
a vaso-occlusive coil coupled to the distal portion of the core member at a location distal to the severable junction.
10. The assembly of claim 9 , wherein the coil member is secured to the distal portion of the elongate core member via a stopper coil and adhesive.
11. The assembly of claim 9 , wherein the joint is contained within a segment of hypotube.
12. The assembly of claim 9 , wherein the spacer member comprises a polyimide material.
13. The assembly of claim 9 , wherein the distal portion of the core member in the region of the severable junction has a diameter within the range of about 0.001″ to about 0.0025″.
14. The assembly of claim 9 , wherein the coil member comprises a stainless steel coil.
15. The assembly of claim 9 , wherein the distal portion of the core member includes a hook that is secured to one or more proximal windings of the vaso-occlusive coil.
16. The assembly of claim 15 , wherein the interface between the hook and the one or more proximal windings of the vaso-occlusive coil is covered with an adhesive.
17. The assembly of claim 15 , wherein the one or more proximal windings are crimped about a portion of the hook.
18. The assembly of claim 15 , further comprising a stretch resistant filament secured at one end to the hook and at another end to the vaso-occlusive coil.
19. The assembly of claim 15 , further comprising a delivery catheter defining an axial lumen therethrough, the vaso-occlusive assembly being slidable through the lumen of the delivery catheter.