A method of forming a PVA foam structure for use in an occlusion device such that the PVA foam structure comprises non-thrombogenic properties. Pressure sensitive capsules containing hydrogen peroxide are embedded within the first pad. Thus, a word line is driven to access a memory cell array. As the bitline length and capacitance are reduced, the speed and power consumption are also improved. Furthermore, a single read operation can be performed after programming is completed.