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The study of PVA containing uracil revealed that the PVA become insoluble by formation of one photodimer per one polymer chain? It was concluded that the effective photo-cross-linking was caused by hydrogen bonds between PVA polymers (Fig. 2)4~. This paper deals with the photo-cross-linking of PVA containing uracil units in concentrated aquous solution, and with application of this system to medical use; embolization of cerebral aneurysms. Microscopic neurosurgical treatments for cerebral aneurysms have become well established. However, there remain some cases with surgically inaccessible and inoperable aneurysms due to their size and/or anatomical situation. There are many successful reports on embolization of surgically difficult giant aneurysms. Detachable balloons and microcoils are used. However, the neck of such aneurysms is so irregular that complete occulusion of the neck by detachable balloon or multiple microcoils is sometimes impossible. A liquid embolous has a very flexible shape. If distal emboli from a liquid embolus could be minimized during embolization of aneurysms, it would be an ideal embolic material. Two kinds of polymers were prepared as shown in Fig. 3. In PVA-1-Ura-e-2, uracil is linked to PVAby ester bond, and in PVA-1-Ura-e-8, uracil is linked to PVA with long alkyl spacer. Fig. 1. Photodimerization of pyrimidines. R=H: uracil, R=CH3: thymine

Photo-Cross-linking of Polyvinyl Alcohol Containing Uracil in Concentrated Solution.