Етилен винил алкохол (EVOH) (лава) е а съполимер с а диметил сулфоксид (DMSO) разтворител и а суспензия на (радиопак) микронизиран тантал прах. Когато инжектирани чрез а катетър и смесени с кръв % 2c разтворител е разреден % 2c утаяване на съполимер в а гъба гласове с а гел като консистенция. Това резултати в съдова оклузия в а по-бавно скорост от лепило.
The Lava is manufactured in varying viscosities (Lava-12/18/34), which can be chosen for the required purpose. For example, Lava-34 with lower viscosity is more fluid for distal microvessles, Lava-18 with standard formula for general use, while Lava-34 with higher viscosity for high flow vessels. Lava must be agitated to ensure the mixture is uniform and then can be injected via a catheter into the required vascular tree. Specific syringes and catheters are used because the DMSO solvent can degrade equipment. There is much less of an inflammatory response with Lava when compared with glue. As Lava is nonadhesive, the risk of blockage and entrapment of the catheter is of much less of a concern compared to the use of glue. Lava can be injected intermittently using the same catheter to assess the progress fluoroscopically. A small volume of polymer gel forms around the catheter tip, which creates a skin at the interface of the mixture and blood. As more embolic is injected, this expands, forming continuous rupture and reskinning of the embolus, resulting in a lava-like flow of embolic, affording a greater level of control than with glue. Lava has been utilized for embolization of AVMs and hypervascular tumors.
