The invention relates to a vascular endoprosthesis including a device for preventing any endoleak after an angioplasty. A query object is provided that supports a plurality of OLAP servers which use different structured query formats. In the high pressure part, fuel is fed from at least one high pressure accumulatorreservoir to at least one fuel injector. Ions are easily intercalated to and deintercalated from between the layers. By only retrieving parameters for a primitive that is rendered, performance is increased.