Patent ID: 8826833

Claim:
A self-expanding mechanism comprising: a first side connected to a second side at a first corner; the first side and the second side further being connected by a first contracting element; a third side connected to a fourth side at a second corner opposite the first corner; the third side further being connected to the fourth side by a second contracting element, the first side further being connected to the third side at a third corner, and the second side further being connected to the fourth side at a fourth corner; and the first contracting element acting on the first side and the second side to pull the first side and the second side toward each other, and the second contracting element acting on the third side and the fourth side to pull the third side and the fourth side toward each other, wherein the first contracting element acting on the first side and the second side, and the second contracting element acting on the third side and the fourth side, cause the first corner and the second corner to move away from each other.