A device includes a first reservoir configured to include a degrading agent, a first valve in fluid communication with the first reservoir, and a reservoir driver configured to manipulate the first reservoir to effect a first reservoir condition based on a first tissue condition. The first valve is configured...http://www.google.de/patents/US7771414?utm_source=gb-gplus-sharePatent US7771414 - Controlled release devices for therapeutic treatments of spinal discs
