Laser treatment device and method

A laser treatment head apparatus for applying a laser beam to mucosa lining a bodily cavity, the apparatus comprising:

• (a) an elongate applicator configured for insertion into the cavity, the applicator comprising an output element covered by a sheath;
• i. the output element comprising a proximal region and a distal region, the output element configured for the laser beam to pass longitudinally through the proximal region and deflect off a deflector in the distal region towards the mucosa;
• ii. the sheath comprising a laser-transparent window arranged so that the laser beam from the deflector passes through it to the mucosa;
• and
• (b) a drive connected to the applicator, the drive comprising:
• i. a fixed hollow shaft with a circumferential helical channel, the shaft configured for the laser beam to pass axially through it to the output element;
• ii. a sleeve rotatable about the shaft and comprising a longitudinal slot;
• iii. a pin connected to the proximal region of the output element, projecting through the slot and into or through the channel;
• whereby, upon rotation of the sleeve, the slot causes the pin to ride along the channel, thereby imparting helical motion to the deflector, and
• pulses of the laser beam are applied to the mucosa along a helical path.