RSA Marking Method
MARKING OF PROSTHETICS FOR RSA STUDY, USING TANTALUM BEADS MOUNTED IN MARKER TOWERS.
General
• All work takes place in a fine-engineering laboratory with natural ventilation through window.
• Other work, which might pollute the air or materials, does not take place at the same time.
• The machines, an ’Asiera 1’ router and a ’Wailer Primus’ lathe, are carefully cleaned, removing all oil and debris. Any parts that could possibly release oil are covered with strong dust free polishing paper, which is changed regularly during the day.
• General fine and micro-mechanical handling takes place during the preparation of the towers. The towers are kept in plastic or stainless steel trays.
• Protective gloves of non-sterile vinyl are used during unpacking and handling of the towers.
Prosthetics preparation and work
The prosthetics are held in place in the machine with soft custom-made holders, made of wood or
Acetal (POM)
The drilling is done with special drill bits, and the cooling is done using filtered air.
Marker towers preparation and work
The marker is turned according to the drawing, in titanium material ASTM F67-95 / ISO 5832-2, GR2 or purer.
All marker towers are individually made, according to their placement and the hole in the prosthetic for optimised fit.
The bead, made from tantalum ASTM F 560-92 / ISO 13782, is then fixed into the specially drilled hole, with a custom-made device.
When the bead is in place, the hole is pressed to retain the bead with a special constructed machine. The opening then becomes smaller than the bead, keeping it securely in place.
Mounting of the marker towers
The prosthetic is placed in a custom-made wooden jig. The marker towers are then gently driven into the drilled holes, using a special instrument.
The prosthetic is then returned to its original packaging, which is then marked, or signed, as opened and unsterile.
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