Iowa Code § 263A.8
Under no circumstances shall any bonds or notes issued under the terms of this chapter be or become or be construed to constitute a debt of or a charge against the state of Iowa within the purview of any constitutional or statutory limitation or provision. No taxes, or other funds of the state of Iowa appropriated to the institution may be pledged for or used to pay such bonds or notes or the interest thereon but any such bonds or notes shall be payable solely and only as to both principal and interest from the hospital income received by the institution as hereinbefore provided, and the sole remedy for any breach or default of the terms of any such bonds or notes or proceedings for their issuance shall be a proceeding either in law or in equity by suit, action, or mandamus to enforce and compel performance of the duties required by this chapter and the terms of the resolution under which such bonds or notes are issued.
Iowa Code § 263A.8