Implantable localised illuminating device with improved architecture

An implantable illuminating device to be implanted in a living being to locally illuminate a region of said living being, said device comprising:

• a probe that is elongate along a longitudinal axis between a near end and a far end, said probe being a rod of circular cross section of constant diameter overall a length of the probe, the probe including a stimulating optical fiber that comprises a core, a cladding, and a protective coating, and a jacket, wherein the probe further includes a plurality of successive segments along the longitudinal axis, each segment having a cross section containing a plurality of concentrically superposed layers, wherein the cross section of each segment includes a plurality of superposed layers that is different from the cross section of each adjacent segment,
• wherein the segments include
• a first segment along which said stimulating optical fiber is covered by the jacket, wherein the cross section of the first segment includes a first layer including the optical-fiber core, a second layer including the optical-fiber cladding, a third layer including the protective optical-fiber coating, a fourth layer including the jacket, and an external fifth layer composed of a tube,
• a second segment extending from said first segment, in which said stimulating optical fiber in the second segment does not include the protective coating but includes only the core and the optical cladding covered by the jacket, wherein the cross section of the second segment includes a first layer including the core of the optical fiber, a second layer formed from the cladding of the optical fiber, and a third layer including the jacket,
• a third segment extending from said second segment, wherein the cross section of the third segment includes only a first layer comprising said jacket and a second layer comprising the tube, and
• a terminal segment extending from the third segment and including only said jacket, said terminal segment including the far end of the probe, wherein the far end is configured so as to be atraumatic.