Stretch resistant therapeutic device
View Patent ↗A vasoocclusive coil is reinforced with a stretch resistant member to improve safety during retraction of the coil. The stretch resistant member is fixedly attached at one end to the vasoocclusive coil, and the other end of the stretch resistant member is detachably mounted to an elongated pusher member to allow for placement and release of the vasoocclusive coil within the patient's vasculature.
1. An apparatus for release and deployment of a stretch resistant therapeutic device within a patient's vasculature, comprising:
an elongated flexible tubular catheter having a frustoconically shaped distal tip;
a vasoocclusive coil having a proximal end and a distal end, said vasoocclusive coil defining a lumen between said proximal and distal ends; and
a stretch resistant member having a proximal end and a distal end, said stretch resistant member extending through said lumen of said vasoocclusive coil, said stretch resistant member being fixedly attached at said distal end of said stretch resistant member to said distal end of said vasoocclusive coil and not fixedly attached at said proximal end of said stretch resistant member to said vasoocclusive coil, and said stretch resistant member being configured to be mechanically releasably mounted to the distal end of said distal tip of said elongated flexible tubular catheter by a tubular distal tip mounted to an outer surface of said frustoconically shaped distal tip of said elongated flexible tubular catheter, said tubular distal tip having a frustoconical shape and formed of a yieldable material configured to releasably hold the proximal end of said stretch resistant member to allow for placement of the vasoocclusive coil within the patient's vasculature.
2. The apparatus of claim 1 , wherein said stretch resistant member is formed of a primary wind.
3. The apparatus of claim 1 , wherein said stretch resistant member is formed of a stranded material.
4. The apparatus of claim 1 , wherein said stretch resistant member is a fiber formed from a polymer.
5. The apparatus of claim 1 , wherein said stretch resistant member is a fiber formed from a polymer selected from the group consisting of an ethylene-octene copolymer, polypropylene, and polyethylene.
6. The apparatus of claim 1 , wherein said stretch resistant member is radiopaque.
7. The apparatus of claim 4 , wherein the vasoocclusive coil is attached to the distal end of the stretch resistant member by heating of the end of the fiber.
8. The apparatus of claim 1 , wherein said proximal end of said stretch resistant member includes at least one rounded member, said tubular distal tip detachably retaining said at least one rounded member.
9. The apparatus of claim 8 , wherein said tubular distal tip is comprised of a polymer.