Abstract: The photodynamic therapy device of the present disclosure is a photodynamic therapy device that irradiates light from a light source onto blood that has been taken out of a patient's body and is flowing in the blood tube, the blood having absorbed a photoreactive agent, to destroy an undesirable component in the blood or affect the component. The photodynamic therapy device includes the irradiation unit that includes a light source and irradiates the blood in the blood tube with light, and the circuit cooling block that cools the blood in the blood tube. The circuit cooling block is connected to the pump that circulates cooling water in the circuit cooling block, the reservoir tank, and the cooling unit that cools water by the water flow path for flowing the cooling water.

Abstract: A photodynamic therapy device of this disclosure includes: a light emitting unit (112, 112) including light sources (110) each belonging to any one of groups; a photodetector (120X, 120Y) configured to output an electrical signal corresponding to an amount of light received from the light sources (110); a light emission control unit (160) configured to sequentially cause the light sources (110) to emit light for each group; and a computing unit (151) configured to calculate, based on a distance coefficient related to a distance between the photodetector (120X, 120Y) and the light sources (110) belonging to the each group, and on a value of the electrical signal output by the photodetector (120X, 120Y) in accordance with light emitted from the light sources belonging to the corresponding group, a group light amount value related to a light amount of the light sources belonging to the each group.

Abstract: Provided is a photodynamic therapy device that enables efficient light irradiation of blood of a patient. A photodynamic therapy device (100) of this disclosure includes a cartridge (10) including a winding core and a tube arranged so as to be wound around the winding core, a casing (50) configured to accommodate the cartridge (10), and a light source (60), which is arranged inside the casing (50), and is configured to irradiate the tube with light. The tube arranged around the winding core has a cross section taken along a direction orthogonal to an extending direction of the tube, which has a first dimension in a first direction and a second dimension in a second direction orthogonal to the first direction. The second dimension is smaller than the first dimension. The second direction is directed outward with respect to the winding core.

Abstract: A signal processing circuit processes a signal based on a quantity of light detected by an infrared detector. The signal processing circuit includes an IV conversion circuit, a filter circuit, and a differential converter circuit. The IV conversion circuit converts a signal of a current value provided from the infrared detector to a signal of a voltage value. The filter circuit allows passage of a signal containing a predetermined frequency component among signals converted by the IV conversion circuit. The differential converter circuit generates a reverse-phase signal of a passed signal that has passed through the filter circuit and provides a differential signal including the passed signal and the reverse-phase signal.