So according to the CBA, if the injury is not hockey related then the club can suspend him without pay, but this does not void the contract. If it's a hockey related injury then Buffalo would be responsible for the medical bills.
CBA (enjoy! LOL):
5. (a) Should the Player be disabled or unable to perform his duties under this SPC he shall submit himself for medical examination and treatment by a physician selected by the Club, and such examination and treatment, when made at the request of the Club, shall be at its expense unless made necessary by some act or conduct of the Player contrary to the terms and provisions of this SPC or the rules established under Paragraph 4. At any time a physician selected by a Club makes a determination as to whether or not a Player is disabled and unable to perform his duties as a hockey Player for purposes of this Paragraph 5 of this SPC, such physician shall evidence such determination by fully completing the form attached to the CBA as Exhibit 25-A, which shall be provided to the Player at the time such determination is made and immediately provided to the Club as well. Upon receipt of such fully completed form, the Club shall send an electronic copy forthwith to the Player, his Certified Agent, the NHL, and the NHLPA (the "Recipients"), which shall contain the language from CBA Exhibit 25-A contained in the "Message to Player", provided, however, that the Club's failure to include such language shall not affect the timeframes set forth in this Paragraph 5, or otherwise prejudice the Club.
(b) If the Player, in the judgment of the Club's physician, is disabled or is not in good physical condition at the commencement of the season or at any subsequent time during the season (unless such condition is the direct result of any injury sustained during the course of his employment as a hockey Player with the Club, including travel with his team or on business requested by the Club) so as to render him unfit to play skilled hockey, then it is mutually agreed that the Club shall have the right to suspend the Player for such period of disability or unfitness, and no compensation shall be payable for that period under this SPC.