Packing coil

An occlusion device, comprising:

• a microcoil having a relaxed secondary configuration;
• the relaxed secondary configuration forming a plurality of closed loops that are each defined by a region of the microcoil that approximately returns to or contacts itself;
• wherein the closed loops are arranged in a tetrahedral shape;
• wherein portions of the microcoil between each of the plurality of closed loops do not contact itself and are each connected to two of the plurality of closed loops.

An occlusion device, comprising:

• a microcoil having a relaxed secondary configuration;
• the relaxed secondary configuration comprising four closed loops forming a tetrahedral shape;
• wherein 1) each of the four closed loops approximately return to or contacts another portion of the microcoil, 2) wherein each of the four closed loops stack portions of the microcoil on top of one another, 3) wherein each of the four closed loops are circular or oval, 4) each of the four closed loops define an area or boundary through which a plane may be approximately positioned, 5) some of the four closed loops are wound in a clockwise direction and some of the four closed loops are wound in a counter clockwise direction;
• 6) wherein portions of the microcoil between each of the four closed loops do not contact itself and are each connected to two of the four closed loops, and, 7) wherein each of the four closed loops are wound from one to 2.25 rotations.