Vaso-occlusive devices

1. A vaso-occlusion system for occluding an aneurysm, comprising:

a delivery catheter having a delivery lumen extending therethrough;

a pusher member at least partially extending through the delivery lumen; and

a vaso-occlusive device loaded within the delivery lumen, the vaso-occlusive device comprising an expandable braid formed out of a plurality of elongate braid filaments, the elongate braid filaments having respective proximal end portions that are formed into a flexible transition section having a proximal end portion attached to a distal end of the pusher member and/or to an elongate central member coupled to, and extending distally of, the pusher member,

wherein in the flexible transition section, the proximal end portions of the elongate braid filaments are unbraided to form straight filaments that are wound into a helical formation that spirals around the pusher member and/or elongate central member.

2. The vaso-occlusion system of claim 1 , wherein the proximal end portions of the elongate braid filaments comprising the flexible transition section are heat seat into the helical formation.

3. The vaso-occlusion system of claim 1 , the vaso-occlusive device comprising the elongate central member to which the flexible transition section is attached.

4. The vaso-occlusion system of claim 3 , wherein the elongate central member comprises a coil.

5. The vaso-occlusion system of claim 3 , wherein the proximal end portion of the flexible transition section is fused or otherwise attached to the elongate central member proximate a junction formed with the pusher member.

6. The vaso-occlusion system of claim 3 , wherein the expandable braid comprises a tubular body portion.

7. The vaso-occlusion system of claim 6 , wherein the elongate central member extends through a lumen formed by the tubular body portion.

8. A vaso-occlusion system for occluding an aneurysm, comprising:

a delivery catheter having a delivery lumen extending therethrough;

a pusher member at least partially extending through the delivery lumen; and

a vaso-occlusive device loaded within the delivery lumen, the vaso-occlusive device comprising an elongate central member coupled to, and extending distally of, the pusher member, and an expandable braid formed out of a plurality of elongate braid filaments having respective proximal end portions that are formed into a flexible transition section having a proximal end portion attached to a distal end of the elongate central member,

wherein the expandable braid comprises a tubular body portion, and

wherein the elongate central member extends alongside the tubular body portion.

9. The vaso-occlusion system of claim 8 , wherein the elongate central member is attached to the tubular body portion at one or more axially spaced attachment locations.

10. The vaso-occlusion system of claim 9 , wherein, at each attachment location, the elongate central member is attached to the tubular body portion by one or more respective elongate braid filaments.

11. A vaso-occlusive device, comprising:

an elongate central support member; and

an expandable braid formed out of a plurality of elongate braid filaments, the elongate braid filaments having respective proximal end portions that are formed into a flexible transition section having a proximal end portion attached to the elongate central member,

wherein in the flexible transition section, the proximal end portions of the elongate braid filaments are unbraided to form straight filaments that are wound into a helical formation that spirals around the elongate central member.

12. The vaso-occlusive device of claim 11 , wherein the proximal end portions of the elongate braid filaments comprising the flexible transition section are heat seat into the helical formation.

13. The vaso-occlusive device of claim 11 , wherein the elongate central member comprises a coil.

14. The vaso-occlusive device of claim 11 , wherein the proximal end portion of the flexible transition section is fused or otherwise attached to the elongate central member proximate a junction formed with a pusher member.

15. The vaso-occlusive device of claim 11 , wherein the expandable braid comprises a tubular body portion, and wherein the elongate central member extends through a lumen formed by the tubular body portion.

16. The vaso-occlusive device of claim 11 , wherein the elongate central member extends alongside the tubular body portion, and wherein the elongate central member is attached to the tubular body portion by one or more respective elongate braid filaments at each of one or more axially spaced attachment locations.