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Measuring the roughness of the inner wall of medical tubing


Examples of medical tubing
Examples of medical tubing

Application

Medical tubes have many uses, such as for blood transfusions. Because fluid directly entering or exiting the human body flows through the tubes, they must meet very high quality standards. Two of the most important standards they must meet are nonadhesiveness to help prevent drugs and blood from sticking to the tube’s wall and minimal air bubble adherence. To achieve nonadhesiveness, the surface of the tube’s inner wall should be as smooth as possible. However, some level of roughness is still required to prevent air bubbles from forming in the tube, but the roughness cannot interfere with the tube’s transparency.

To meet these very specific standards, the roughness of the tube’s inner surface must be carefully controlled. To do this, manufacturers quantify the roughness of their tubes to ensure that they are meeting the standards. However, some tubes may have a special coating on their inner surface or have a small diameter, making the roughness measurements very challenging.

Olympus' solution

Roughness measurement using the OLS5000 3D laser scanning microscope

Measuring the roughness of the inner wall of medical tubing

  1. Noncontact roughness measurement using the microscope’s laser scanning method does not damage the tubes, even if their inner surface is coated. This minimizes the risk of inaccurate roughness data caused by damage to the tube’s inner wall.
  2. The roughness of the inner wall of small-diameter tubes can be measured using the microscope’s long working distance objectives.
  3. The microscope measures planar roughness, and when a specific peak exists in the tube’s inner tube, the system can acquire the shape data without missing the peak.
  4. The system can horizontally stitch together 3D data so that you can evaluate roughness data over a wide area.
  5. Roughness is acquired as numerical data, but can also be acquired and displayed as color, laser, and height image data. This makes it easier to check the tube’s texture using the visual data.

Images

An example of a roughness measurement of the inner wall of a medical tube
An example of a roughness measurement of the inner wall of a medical tube

Olympus IMS
应用所使用的产品

使用奥林巴斯 LEXT OLS5000 激光扫描共焦显微镜,能够通过非接触、非破坏的观察方式轻松实现 3D 观察和测量。仅需按下“Start(开始)”按钮,用户就能在亚微米级进行精细的形貌测量。该产品不仅易于使用,更具备先进功能,能够提供四倍于上一代型号的采集速度。对于需要观察大型样品的客户,LEXT 的长工作距离物镜和选配的扩展机架使得系统能够适用于最大为 210mm 的样本。
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