In a multilayer recordable optical medium, each recording layer includes a luminophore that fluoresces under reading laser light and a quencher capable of quenching the luminophore fluorescence. The sensor is connected to a measurement unit to receive pressure measurement values obtained from the sensor, and to a processing means for determining a set of pressure values, said processing means then determines a set of first order time derivative values determined from the set of pressure values. Methods of placing the wires, such as for subsequent deployment of an abdominal aortic aneurysm bifurcation graft, are also disclosed.