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MEDICAL APPLICATIONS: MEASUREMENT OF COATING ON STENTS

          There are several types of stents used for different medical conditions: vascular, peripheral arthery (e.g. carotoid), stents for clot extraction, restriction of the blood flow in cases of aneurism or cancer and several others.

One class of vascular  stent is drug-eluting stents (DES)  that are designed to minimize in-stent restenosis that was a main disadvantage of bare-metal stents. DES consists of a standard metallic stent, a polymer coating, and an antiproliferative drug that is embedded within a polymer and released over time. Thick coating can result in de-lamination; make it too thin and there may be not enough protection and drug release time.  Quality control of coating thickness and uniformity is one of the critical tasks during DES manufacturing. Stents used for clot extraction and blood flow restriction are covered with polymer film:polyurethane,PTFE or similar polymer materials. Stent encapsulation is also used in vascular application to deploy the stent.
The polymer film is stretched under pressure and it is important to test its thickness to guarantee structural integrity.
MProbe VisHR-MSP system offers a reliable, non-destructive measurement solution for quality control in both cases.

Stents Measurement

Why use MProbeVisHR MSP?

  • small spot  is required for stent measurement and the spot size needs to be adjusted. Typically, ~10 μm for coating on stent struts and 20 to 40 μm for measurement of encapsulation polymer thickness. MProbeVisHR has up to 4 objectives and calibration can be stored for different configurations.
  • Image of the measurement site and the reticle indicating the exact location of measurement makes it easy to navigate to desired location.
  • Results can be displayed directly on the image.
  • 700nm -1100nm wavelength range is best suited for these measurements

MPROBE VISHR-MSP:  measurement of stent encapsulation thickness

BASIC SPECIFICATION:
Wavelength range: 700-1100nm
Wavelength resolution:<0.3nm
Precision: <0.01nm or 0.01%
Accuracy: <1nm or 0.2% 
 Measurement:< 100ms (typical, depends on sample reflectivity)
Spot size: 2μm to 200 μm (depending on objective)
Integrated 2MB camera to display measurement area
Custom holders and automation is available

Read more about MProbe MSP
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