Temporary prosthesis

Hyaluronic acid Cross-linked hyaluronic acid can be used as temporary prosthesis for synovial fluid to treat arthrosis hyaluronic acid is biodegraded in the human body where it is normally regenerated. 

There are two primary types of prostheses preparatory and definitive prostheses. The purpose of a preparatory prosthesis (Fig. 33.6) is to allow early ambulation at an efficient and safe level and yet allow for rapid changes in limb volume that often occur in the days and weeks pKjstoperatively. Preparatory prostheses may also include temporary prostheses or permanent prostheses that lack the cosmetic cover. Preparatory prostheses are typically endoskeletal, facilitating the interchange of components as may be necessary before finalizing the limb design. 

The applicability of poly[(ethylalanate)-co-(imidazole)phosphazene]derivatives as bioresorbable tubular nerve guides prosthesis was verified by Langone etal. (1995). In this case the implant has only a temporary function and needs to be present only during the time necessary for growth and maturation of the ner e within the tube. 

A two-stage procedure consists of the removal of infected implant, tissue and the cement during the first stage, followed by the insertion of a temporary spacer. In the second stage, after infection has healed, the spacer is removed and replaced with the definitive prosthesis. 

The microelectrode array is implanted 10-20 ttm from the retinal surface in a viscous fluid, the vitreous humor [5]. The vitreous is a viscoelastic, gel-like substance that fills the ocular cavity [6]. The experimental setup for characterization of the retinal prosthesis components requires a medium that has the same chemical formulation as the vitreous. Since the early 1900s, different materials have been used as vitreous replacements. These substitutes serve two main purposes. First, they are used to replace a dysfunctional vitreous humor in cases where clouding or physical collapse and liquefaction of the vitreous have occurred. The second is temporary or permanent application during retinal surgery. Since arrays are intended... 

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