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APTERA Cup

The Aptera acetabular shell is a third generation press-fit shell which has been developed in consultation with an experienced surgeon design team.  It is a modular shell giving the option to the surgeon to decide intra-operatively the inlay type: A Polyethylene (UHMWPE) Insert or a Ceramic Liner may be used.

The Aptera shell is Coated with Titanium Plasma Spay (TPS) featuring a porosity of 20-35% with maximum thickness of 400µm, enhancing microlock between bone and implant and osseointegration.

 

Product Characteristics

 1. Manufactured from Titanium 6 Aluminium 4 Vanadium alloy in accordance with ISO

     5832-3. Ti6Al4V is a proven biocompatible low modulus material.

2. Available in the following product range 42-68mm (in 2mm increment)

3. Hemispherical shell with three holes for screw fixation

4. Internal polished surface for the prevention of wear

5. Internal anti-rotational locking mechanism for the prevention of micromotion between the shell and the inlay, providing rotational stability and resistance to torsional loads for polyethylene inserts

6. Provided with sealing plugs for the closure of the interface space

7. Position markers on the shell’s plane surface allow the screw holes to be aligned in a cranio-lateral direction.

 

BONIT®  Coating Technology

BONIT®  is a bone-like surface coating. The microcrystalline structure of the calcium

phosphate (CaP) coating maintains substrate surface roughness, providing a large area for bone integration. BONIT® is designed to enhance rapid osseointegration.

BONIT® is a composite of two thin microcrystalline CaP phases that have differing solubility characteristics. The more soluble phase (brushite) promotes short term bone synthesis, whereas the inner phase (microcrystalline hydroxyapatite) is resorbed more slowly and releases ions over a relatively long period. This promotes bone formation.

The co-ordinated bioactivity of these two phases greatly improves the healing process and fosters long –term implant tolerability. The closely packed and almost perpendicular CaP crystals offer a large, open implant surface with a potent capillary effect on blood, beneficial for the adsorption of the growth factors and for the attachment of the bone cells.

The BONIT® coating process modifies the properties of the implant surface but has no effect on the chemical and physical properties or the biomechanical functionality of the implant material itself.

 

Advatages at a glance

• Outstanding biocompatibility

• Thin coating

• Microcrystalline structure, large open surface

• High solubility and controlled resoption area

• No particle shedding or flaking

 

ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE (UHMWPE)

Individual polyethylene inlays (standard and hooded) are designed for each size of the shell providing the maximum thickness of the polyethylene and the minimum thickness of the shell.

Vadin implants pays considerable attention to the manufacturing method, quality control and sterilization of the polyethylene inserts. All UHMWPE inserts are sterilized with Gamma irradiation in a vacuum environment to avoid oxidation during the process.

The UHMWPEs are available with internal diameter:

22 mm, 28mm, 32mm and 36mm (only for the std. version) in two different types:Standard andHooded (10 degrees).

 

CERAMIC ON CERAMIC ARTICULATION

Vadin Implants uses the newest ceramic material which is an alumina matrix composite, labeled BIOLOX® Delta. BIOLOX® delta is a zirconia-toughened, platelet-reinforced alumina ceramic (ZPTA), designed to incorporate the wear properties and stability of alumina with vastly improved  material strength and toughness. BIOLOX® delta contains approximately 74% alumina and 25% zirconia. Additives of chromium dioxide and strontium oxide enhance the performance of the material.

The Strengths of BIOLOX® delta

•  Increased fracture toughness

•  Increased fracture strength

•  Crack-stopping function

•  Excellent diocompatibility

 

BIOLOX®deltais clearly superior when it comes to the following crucial parameters: grain size, bending strength, and fracture toughness.

In order to minimize wear at the articular surface of a total hip replacement, it is essential to use femoral heads with a smooth surface finish. An exceptionally smooth surface can be achieved with high hardness materials such as BIOLOX deltathrough precise polishing processes.