The object of the present invention is to provide a calcium phosphate-collagen fiber composite which has an excellent mechanical property, can induce bone replacement by rapid bone remodeling, and can be used in a high-load region. The congestive heart failure can be of any etiology, such as systolic or diastolic heart failure, ischemic or non-ischemic cardiomyopathy. A gas or a gas mixture is circulated in the system via a blower. The target device is reversible and can include both a front and rear with contrasting colors or designs. The disk prosthesis may provide for both rotation and compression.