A therapeutic lighted catheter that can provide therapeutic light within a biological fluid passage for purposes of treatment and/or curing of materials within the passage. The catheter includes an elongated shaft having a first end and a second end positioned opposite the first end, the elongated shaft including a lumen extending substantially therebetween, and at least one light emitting element positioned within the elongated shaft. A control system is in electronic communication with the light emitting element and provides power thereto such that the powered light emitting element applies a light within the biological fluid passage for therapy and/or curing. The catheter can also include a means to apply a curable material.