METHOD FOR MANUFACTURING REFRACTING X-RAY LENSES Russian patent published in 2007 - IPC G21K1/06 

FIELD: medical engineering.

SUBSTANCE: method involves manufacturing lens from material capable of photopolymerization, forming one or several lenses with required focal distance by introducing required quantity of the lens material in liquid state into cylindrical holder which material possesses required wetting angle for given liquid. The holder is placed on centrifuge and rotated together with the lens material to achieve uniformity under preset rotation frequency condition. Then, when rotating, the lens material is transformed into solid state due to light source radiation flow being applied. Rotation is stopped and lens is assembled in the holder. Oligomer composition, capable of frontal free radical photopolymerization with monomer corresponding to it, and reaction photoinitiator, is taken as the lens material. Working temperature is to be not less than on 30-40°С higher than polymer glass-transition temperature during polymerization. The lens material transformation into solid state by applying rotation is carried out by means of frontal photopolymerization method with polymerization front moving along the lens axis from below upwards or along the lens radius.

EFFECT: enhanced effectiveness in producing x-ray lenses having paraboloid-of-revolution refraction structure and having aperture increased to several millimeters without microroughnesses available on the surface.

8 cl