Multi-layer coaxial vaso-occlusive device
First Claim
1. A vaso-occlusive device, comprising:
- an elongate, flexible, filamentous inner element;
a non-metallic intermediate element coaxially surrounding the inner element and in intimate contact therewith; and
an outer element coaxially surrounding the intermediate element, the outer element defining an open area through which the intermediate element is exposed;
wherein along a substantial predetermined portion of the length of the device, the open area constitutes at least about 20 percent of the surface area of device within the predetermined portion of its length.
1 Assignment
0 Petitions
Accused Products
Abstract
A vaso-occlusive device includes inner, intermediate, and outer elements arranged coaxially. The inner element is a filamentous element, preferably a microcoil. The intermediate element is made of a non-metallic material, preferably an expansile polymer. The outer element is substantially non-expansile and defines at least one gap or opening through which the intermediate element is exposed. In a preferred embodiment, when the intermediate element is expanded, it protrudes through the at least one gap or opening in the outer element and assumes a configuration with an undulating, convexly-curved outer surface defining a chain of arcuate segments, each having a diameter significantly greater than the diameter of the outer element. The expanded configuration of the intermediate element minimizes friction when the device is deployed through a microcatheter, thereby reducing the likelihood of buckling while maintaining excellent flexibility. The result is a device with enhanced pushability and trackability when deployed through a microcatheter.
-
Citations
25 Claims
-
1. A vaso-occlusive device, comprising:
-
an elongate, flexible, filamentous inner element;
a non-metallic intermediate element coaxially surrounding the inner element and in intimate contact therewith; and
an outer element coaxially surrounding the intermediate element, the outer element defining an open area through which the intermediate element is exposed;
wherein along a substantial predetermined portion of the length of the device, the open area constitutes at least about 20 percent of the surface area of device within the predetermined portion of its length. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A vaso-occlusive device comprising:
-
a filamentous inner element;
a non-metallic intermediate element coaxially surrounding the inner element and in intimate contact therewith; and
an outer element coaxially surrounding the intermediate element and having an open area through which the intermediate element is exposed, the outer element comprising a helically-wound filament defining a helical coil having a pitch that is greater than the diameter of the filament. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
-
Specification