Vascular remodeling device
A generally spherical vascular remodeling device is permanently positionable at a junction of afferent and efferent vessels of a bifurcation having an aneurysm. After positioning the device at the junction to substantially conform the device to the shape of the junction, the device acts as a scaffolding to inhibit herniation of objects out of the aneurysm and permits perfusion to the efferent vessels. Positioning the device may include deployment and mechanical or electrolytic release from a catheter. Embolic material may be inserted in the aneurysm before or after positioning the device. The device may have a first end, a second end substantially opposite to the first end, and a plurality of polymer filaments extending between and coupled at the first end and the second end. Such devices may be football shaped, pumpkin shaped, or twisted. The device may include a plurality of polymer loops forming a generally spherical shape.
1. A method of treating an aneurysm at a junction of a bifurcation having an afferent vessel and efferent vessels, the aneurysm having a neck and a fundus, the method comprising:
advancing a catheter proximate to the junction of the bifurcation, the catheter at least partially containing a generally spherical vascular remodeling device in a compressed state, wherein the device comprises a plurality of polymer filaments;
positioning the device at the junction of the bifurcation; and
withdrawing the catheter and leaving the device at the junction of the bifurcation, wherein a distal end of the device acts as a scaffolding to inhibit herniation of objects out of the neck of the aneurysm and wherein the device permits perfusion of fluid to the efferent vessels, and wherein proximal ends of the plurality of polymer filaments are coupled together by a bioabsorbable coupling at a proximal end of the device, wherein the coupling is configured to bioabsorb more quickly than does the plurality of polymer filaments, and wherein the proximal ends of the plurality of polymer filaments are configured to extend toward the afferent vessel after bioabsorption of the coupling.
2. The method of claim 1 , wherein at least some of the polymer filaments comprise polyglycolic acid, polylactic acid, poly(lactic-co-glycolic acid), poly-epsilon-caprolactone, or naturally-derived bioabsorbable polymers.
3. The method of claim 1 , wherein a first group of the polymer filaments comprise a first polymer having a first rate of bioabsorption and wherein a second group of the polymer filaments comprise a second polymer different than the first polymer, the second polymer having a second rate of bioabsorption different that the first rate of bioabsorption.
4. The method of claim 1 , wherein the bifurcation is a neurovascular bifurcation.
5. The method of claim 1 , wherein the device substantially conforms to a shape of the junction.
6. The method of claim 1 , wherein positioning the device comprises: deploying the device from the catheter; and expanding the device.
7. The method of claim 6 , wherein expanding the device comprises allowing the device to expand towards an uncompressed state.
8. The method of claim 6 , wherein positioning the device further comprises, after expanding the device, releasing the device from the catheter.
9. The method of claim 8 , wherein releasing the device comprises mechanically releasing or electrolytically releasing the device from the catheter.
10. The method of claim 8 , further comprising: after expanding the device, retracting the device into the catheter; redeploying the device from the catheter; and re-expanding the device.
11. The method of claim 1 , further comprising inserting embolic material in the fundus of the aneurysm, the objects comprising the embolic material.