Plasma Sprayed HA Coatings

Technology

DOT applies the plasma sprayed HA coating to the implants in a vacuum chamber using the VPS vacuum technique.

Range of Application

Joint implants: hip joint, knee joint, ankle joint, shoulder joint, wrist joint, finger implants and spinal implants

Advantages of the Procedure

Surface enlargement
High primary stability of the implant due to rough surface
Long-time stability due to bone ingrowth into the porous HA layer
Improved fatigue strength of the implants compared with sintering techniques
Application of VPS technique leads to increased purity and adhesive strength in comparison to other methods (e.g. APS - Atmospheric Plasma Spray)

Properties

Color: light gray/white
Coating thickness: 20–200 µm
Roughness Ra: 5–13 µm
Porosity: 10–20 %
Adhesion strength: ≥ 15 MPa
Ca/P ratio: 1.61–1.76
Porous, crystalline surface
Degree of HA crystalline phase: ≥ 45 %
Very good biocompatibility
Phase composition:
- HA ≥ 50 w% *1
- a-TCP, ß-TCP, TTCP ≤ 30 w% *2
- CaO ≤ 5 w% *2

*1 Relative to the total mass of the coating
*2 Mass ratio of the foreign phases relative to the mass ratio of the crystalline HA

BONIT®

BONIT^® is an electrochemical coating technique developed by DOT that is used to apply of a thin, ... Read more>>