(a) To facilitate the procurement of medical equipment pursuant to section 8157 of this title, the Secretary may enter into escrow agreements with institutions described in section 8153(a) of this title. Any such agreement shall provide that—
the Secretary, as escrow agent, shall administer those funds in an escrow account; and
the Secretary shall disburse the escrowed funds to pay for such equipment upon its delivery or in accordance with the contract to procure the equipment and shall disburse all accrued interest or other earnings on the escrowed funds to the institution.
(b) As escrow agent for funds placed in escrow pursuant to an agreement under subsection (a), the Secretary may—
invest the escrowed funds in obligations of the Federal Government or obligations which are insured or guaranteed by the Federal Government;