MedTec

Hip prosthesis roughness

Medical Authorities requires roughness measurement according to ISO Standard for human implementation of hip prosthesis. Lyncée Tec has developed a system for their automated measurement with manual loading of both cup and ball hip spherical prosthesis:. It enables:

  • Measurement in production environment with external vibrations due to surrounding presence of CNC and polish machines
  • Quality control of roughness with very low Ra acceptance threshold
  • Implant diameters form 1cm to 8cm
  • Non-contact measurement to avoid any scratch and surface contamination

Successful comparison of DHM measurements has been carried out on hip prosthesis characterized by METAS (The Swiss Federal Institute of Metrology).

Description

  • Material:
    • Stainless steel hip prostheses
    • Diameter from 1 cm to 8 cm
  • Typical Ra threshold: 1 to 6 nm
  • Automated Process
    • Manual prosthesis loading
    • Bar code reading for lot authentication
    • Automation of cap and ball orientation according to dimension
    • Automated focalization
    • Scan of the surface
    • Automated report on the lot on a secure server
  • Instrument:
    • DHM® R-1000
    • Stage with 5 motorized axis: XYZ, θ, ϕ
  • Software
    • TCP/IP remote to control a network of 3 DHM® by an automated supervision system for acquisition and data management
    • Customized user interface dedicated to the application and adapted to production operators
  • Time scale for the full process: <30 s
  • Magnification: 10x

Example of dedicated hardware and software for automated roughness measurement

Silicone is used to reduce friction and improve glide in many applications. Here are a few examples:

  • Medical needles and catheters: Silicone reduces insertion pain by limiting friction, making procedures more comfortable for patients.
  • Pharmaceutical bottle caps and plungers: Silicone surfaces provide a better seal and allow caps to be easily pushed in or removed without sticking.
  • Surgical instruments: Some instruments require a silicone coating to limit wear and ensure smooth movement during surgery.
  • Disposable packaging and medical devices: Silicone-coated surfaces make it easier to remove packaging and provide better protection against contamination.
  • Laboratory equipment: Tubes, pipettes and laboratory containers can be siliconized to facilitate cleaning and prevent adhesion of chemicals or samples.
  • Ophthalmic devices (contact lenses, examination equipment): Silicone prevents dust and residues from accumulating on surfaces, ensuring greater comfort and clearer vision.
  • Industrial and processing equipment: In production lines, rollers, conveyors and equipment requiring slippery surfaces to prevent products from sticking can also be siliconized.

For many of these applications, it is very important to control the that the right amount of silicon is deposed on the sliding surfaces. Lyncée has developed an automated system to measure the amount of silicon deposed on a surface.

Descripion

  • Material:
    • Stainless steel and ceramic balls
    • Diameter down to 0.4 mm
  • Typical Ra threshold: 10 nm
  • Automated Process
    • Ball rotation
    • Automated OK/NOK decision
  • Instrument:
    • DHM® R-1000
  • Software: customized user interface realized using the Software Development Kit
  • Time scale for the full process: <10 s
  • Magnification: 10x or 20x

3D measurement of a bearing ball