Ohio Rev. Code Ann. § 4121.27

No court of this state, except the supreme court to the extent specified by sections 4101.01 to 4101.16 and 4121.01 to 4121.29 of the Revised Code has jurisdiction to review, vacate, set aside, reverse, revise, correct, amend, or annul any order of the bureau of workers' compensation, or to suspend or delay the execution or operation thereof or to enjoin, restrain, or interfere with the bureau in the performance of its official duties. The writ of mandamus shall lie from the supreme court to the bureau in all proper cases.