| abstract |
A light delivery system for illuminating a flexible stricture in a tube, e.g. on oesophyal tumour, comprising a dilator (1) including a transparent window (7) which is used to dilate the stricture so that it is in contact with the transparent window (7). The transparent window (7) is adapted so that it contacts a known pre-determined area of stricture so that the illumination of the stricture can be measured. This is achieved either by the transparent window being cylindrical and terminated by opaque end caps (3, 5) flush with the outer surface of the window or by the dilator and window being inflatable to a pre-determined size. The dilator (1) has a hollow central core (9) to allow it to be threaded along a wire and to allow an optical fibre to be used to deliver light to it. |