A vascular occluding device for modifying blood flow in a vessel, while maintaining blood flow to the surrounding tissue. A closure device is provided for closing off the bleed passage for sealing off the air-tight secondary chamber to alter the flexibility characteristics of the walls of the compensation chambers and effectively turn off the hydraulic damping function of the hydraulic bushing. The compounds of the invention are useful for treating conditions in which there is likely to be a histamine andor leukotriene component. A data acquiring system is provided for acquiring the first and second data and a data processing system processes the acquired first and second data for determining if the first and second components are compatible to be assembled as an approved PP configuration. The two LEDs are placed on a conductive substrate ; therefore, the bonding pads of the two LEDs are on the back of the conductive substrate and the light emitting surfaces of the two LEDs, thus overcoming such problems of low light emitting efficiency and high thermal resistance of the traditional lateral structure.