Medical device

Elongated X-ray tube unit (12) comprising an x-ray tube (16) at the distal end, the x-ray tube includes at least one distal pole (8) and one proximal pole (4), said unit is provided with a single electrical conductor (18) connected to the proximal pole and the distal pole is adapted to be electrically accessible at a closed end of a catheter at the distal end of the unit.

Method of using a medical system comprising a hollow catheter (14) having an open proximal end and a closed distal end, for insertion into a human or animal body, and an elongated x-ray tube unit (12) provided with an x-ray tube (16) at its distal end and adapted to be inserted into the catheter, a distal pole (8) of the x-ray tube is connectable to a connection means (22) in the distal end of said catheter, wherein the x-ray tube is energised via a single electrical conductor (18) in said x-ray tube unit connected to a proximal pole (4) of said x-ray tube and via said connection means, wherein the method comprises the following steps:

• A) inserting said hollow catheter having an open proximal end and a closed distal end into a body so that the distal end of the catheter is arranged a predetermined distance distal a position where x-ray radiation treatment is to be performed;
• B) inserting said elongated x-ray tube unit (12) into the catheter to a position where the distal pole (8) of the x-ray tube is connected to the connection means (22) of said catheter, and
• C) moving, according to a pre-set movement pattern, the hollow catheter and the x-ray tube unit so that a predetermined dose of radiation generated by the activated x-ray tube is applied to the treatment site.