Is there any case law supporting a claim that a prisoner's civil rights have been abridged by a medical malpractice clinic?

Before it can be said that a prisoner's civil rights have been abridged, "the indifference to his medical needs must be substantial. Mere 'indifference,' 'negligence,' or 'medical malpractice' will not support this cause of action." Broughton v. Cutter Lab., 622 F.2d 458, 460 (9th Cir. 1980) (citing Estelle, 429 U.S. at 105-06). Even gross negligence is insufficient to establish deliberate indifference to serious medical needs. See Wood v. Housewright, 900 F.2d 1332, 1334 (9th Cir. 1990).