https://cdn.mtdcnc.global/cnc/wp-content/uploads/2020/06/02153713/Picture2-640x360.jpg
    Measurement

    Bruker Alicona proves its point at the sharp edge of measurement

    • By Bruker Alicona
    • June 1, 2020
    • 4 minute read

    The effectiveness of both cannula and injection needles are tested using the measurement of penetration force and track force in a well-established and standardised technique. Could you imagine the pain and discomfort that you could endure if such stringent testing was not being undertaken?

    The results of the testing process indicate if the product is suitable for patient use or not by measuring the force needed for insertion. If a device fails this test, there is a need to understand the reason why it has failed and to optimise the manufacturing process so that failures are reduced. The performance of these meticulously manufactured and inspected devices include testing of the sharpness of the tip, the cutting-edge radius, burrs on the inner and outer surfaces and also the surface finish of the needle.

    Each of these specific features and the respective testing must adhere to the most scrupulous, diligent and conscientious manufacturing specifications and processes. Like any manufacturing process, there are on occasions failures, which raises the question of what can be done to find the cause of the problem if the needles fail the test?

    This is where experts like Bruker Alicona SL step into the equation. Non-contact optical measurement is the only feasible solution in such manufacturing environments. This is because optical 3D metrology allows the manufacturer to accurately measure key features. Unlike conventional contact metrology, optical metrology is non-contact and provides a full 3D view of the item under test and it is on this 3D model that measurements are performed.

    The instrument used for these measurements is the Bruker Alicona InfiniteFocusSL, this optical 3D measurement system provides easy, fast and traceable measurement of form and finishes on micro-structured surfaces. It enables users to measure both form and roughness of components with only one system whilst the colour images provide high contrast and depth of focus. The InfiniteFocusSL achieves measurements in seconds and features, such as a coaxial laser for quick and easy focusing, further increase usability. With an automation interface, the InfiniteFocusSL is also applied for fully automatic measurement in production with sub-micron precision levels. For the measurement of cannula and injection needles, the system is fitted with a rotation device. This allows the needle to be rotated through 360 degrees to provide a full-colour high-resolution data set that can be compared against CAD models.

    Using the Bruker Alicona InfiniteFocusSL, world-leading customers in this sector can attain a full 3D view of the tip of the needle in high resolution, which subsequently shows any surface defects, cutting edge defects and burrs.

    Concerning the cutting edge, this feature has a major influence on the performance of the needle and using the optical measurement process, the edge can be easily displayed and measured. The measurement of the edge is conducted using 500 profile lines that are placed across the edge to show an edge radius of 4.35µm.

    From a cutting edge and surface finish perspective, customers can use a 3D model of the cutting edge to place a measurement line directly along the cutting edge and measure the roughness and chipping along the edge. In this case, the measurement is shown as 0.977µm Ra. It is also possible, using the same method, to measure the roughness on the outside and inside of the needlepoint in any direction.

    Using the Bruker Alicona InfiniteFocusSL, it is possible to measure the total geometry of features such a sphere and cylinder using 3D geometry measurement tools as shown above. In this case, the image shows a radius of 382.54µm.

    This example from a Bruker Alicona end-user that is actively applying optical metrology as a tool to assess the geometric elements of its medical devices, is a clear way to identify that the smallest and most complex of devices conform to design and manufacturing tolerances. This method of measurement also provides an opportunity to understand why a product fails during the penetration and track force test.

     

     

    https://cdn.mtdcnc.global/cnc/wp-content/uploads/2020/06/02153713/Picture2-640x360.jpg

    Bruker Alicona proves its point at the sharp edge of measurement

    The effectiveness of both cannula and injection needles are tested using the measurement of penetration force and track force in a well-established and standardised technique. Could you imagine the pain and discomfort that you could endure if such stringent testing was not being undertaken?

    The results of the testing process indicate if the product is suitable for patient use or not by measuring the force needed for insertion. If a device fails this test, there is a need to understand the reason why it has failed and to optimise the manufacturing process so that failures are reduced. The performance of these meticulously manufactured and inspected devices include testing of the sharpness of the tip, the cutting-edge radius, burrs on the inner and outer surfaces and also the surface finish of the needle.

    Each of these specific features and the respective testing must adhere to the most scrupulous, diligent and conscientious manufacturing specifications and processes. Like any manufacturing process, there are on occasions failures, which raises the question of what can be done to find the cause of the problem if the needles fail the test?

    This is where experts like Bruker Alicona SL step into the equation. Non-contact optical measurement is the only feasible solution in such manufacturing environments. This is because optical 3D metrology allows the manufacturer to accurately measure key features. Unlike conventional contact metrology, optical metrology is non-contact and provides a full 3D view of the item under test and it is on this 3D model that measurements are performed.

    The instrument used for these measurements is the Bruker Alicona InfiniteFocusSL, this optical 3D measurement system provides easy, fast and traceable measurement of form and finishes on micro-structured surfaces. It enables users to measure both form and roughness of components with only one system whilst the colour images provide high contrast and depth of focus. The InfiniteFocusSL achieves measurements in seconds and features, such as a coaxial laser for quick and easy focusing, further increase usability. With an automation interface, the InfiniteFocusSL is also applied for fully automatic measurement in production with sub-micron precision levels. For the measurement of cannula and injection needles, the system is fitted with a rotation device. This allows the needle to be rotated through 360 degrees to provide a full-colour high-resolution data set that can be compared against CAD models.

    Using the Bruker Alicona InfiniteFocusSL, world-leading customers in this sector can attain a full 3D view of the tip of the needle in high resolution, which subsequently shows any surface defects, cutting edge defects and burrs.

    Concerning the cutting edge, this feature has a major influence on the performance of the needle and using the optical measurement process, the edge can be easily displayed and measured. The measurement of the edge is conducted using 500 profile lines that are placed across the edge to show an edge radius of 4.35µm.

    From a cutting edge and surface finish perspective, customers can use a 3D model of the cutting edge to place a measurement line directly along the cutting edge and measure the roughness and chipping along the edge. In this case, the measurement is shown as 0.977µm Ra. It is also possible, using the same method, to measure the roughness on the outside and inside of the needlepoint in any direction.

    Using the Bruker Alicona InfiniteFocusSL, it is possible to measure the total geometry of features such a sphere and cylinder using 3D geometry measurement tools as shown above. In this case, the image shows a radius of 382.54µm.

    This example from a Bruker Alicona end-user that is actively applying optical metrology as a tool to assess the geometric elements of its medical devices, is a clear way to identify that the smallest and most complex of devices conform to design and manufacturing tolerances. This method of measurement also provides an opportunity to understand why a product fails during the penetration and track force test.