Expanding medical device with support
This application describes various embodiments of an expandable device that includes at least one support member. The support member (or members) is integrated into the structure of the expandable device and increases its column strength, which thus augments pushability of the expanding device through a delivery catheter. The support member allows force applied while pushing from the proximal end of the expandable device to be translated to the distal end of the device and therefore avoid bunching or deformation without increasing the profile of the device to a degree that would prohibit passage through a lumen of a specific required size. Thus, the expandable devices described herein address at least some of the shortcomings discussed above.
1. An expanding medical device, comprising:
a braided wire structure configured to self-expand from a constrained state to an expanded state comprising a first end and a second end, wherein the braided wire structure comprises a lobe; and
a support member extending from the first end to the second end, wherein the support member provides longitudinal stiffness to the braided structure when the braided wire structure is in the constrained state,
wherein the support member has a curved shape that forms a single loop within the lobe, wherein the loop is radially offset from a longitudinal axis of the braided wire structure when the braided wire structure is in the expanded state,
wherein the support member in the expanded state is free floating and does not bear on an inner surface of the braided wire structure, and
wherein the support member is uncoiled and substantially straight when the braided wire structure is in the constrained state.
2. The expanding medical device of claim 1 , wherein the support member is configured to transfer a distally directed force applied to the first end to the second end when the braided wire structure is in the constrained state.
3. The expanding medical device of claim 1 , wherein the braided wire structure comprises a shape memory material selected from the group consisting of nickel-titanium alloy, spring stainless steel, shape memory metals, and shape memory polymers.
4. The expanding medical device of claim 1 , wherein the braided wire structure comprises nitinol.
5. The expanding medical device of claim 1 , wherein a diameter of the support member is the same or larger as a diameter of a wire of the braided wire structure.
6. The expanding medical device of claim 1 , wherein the support member comprises a shape memory material selected from the group consisting of nickel titanium alloy, spring stainless steel, shape memory metals, and shape memory polymers.
7. The expanding medical device of claim 6 , wherein the support member comprises nitinol.
8. The expanding medical device of claim 1 , wherein the braided wire structure comprises a second lobe and a reduced diameter portion disposed between the first lobe and the second lobe, and wherein in the expanded configuration, the support member forms a single loop within the second lobe.
9. The expanding medical device of claim 8 , wherein the expanding medical device is configured to occlude a blood vessel.
10. The expanding medical device of claim 1 , wherein the braided wire structure comprises a lumen extending between the first end and the second end, and
wherein the support member is disposed within the lumen.
11. The expanding medical device of claim 1 , wherein the support member is configured to draw the first end axially closer to the second end when the braided wire structure is in the expanded state.
12. The expanding medical device of claim 1 , wherein the support member in the expanded state does not contact an inner surface of the braided wire structure.