Basic Study
Copyright ©The Author(s) 2016.
World J Gastroenterol. Aug 14, 2016; 22(30): 6917-6924
Published online Aug 14, 2016. doi: 10.3748/wjg.v22.i30.6917
Figure 1
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Figure 1 Resistance force to migration measurement machine. The machine consists of a retraction robot (arrows), a silicone wall (arrowheads), and a force gauge (Model DPRS5T, Imada, Tokyo, Japan). The covered self-expandable metal stent is fixed into a round hole in the silicone wall (arrowheads) and its distal end is connected to the force gauge device. The stent is retracted from the wall at a speed of 1 mm/s. by using the retraction robot (arrows).
Figure 2
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Figure 2 Schematic depiction of a stent. Stent structure is expressed as outer diameter of the fully expanded stent (ODES; mm), outer diameter of the compressed stent (ODCS; mm), outer diameter of the flare (ODF; mm), height of the flare [HF = (ODF-ODES)/2; mm], length of the flare (LF; mm), and taper angle of the flare (TAF = HF/LF; degree).
Figure 3
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Figure 3 Resistance force to migration and radial force of 6 stents. A: The resistance force to migration (RFM) of each stent when the outer diameter of the compressed stent was 6, 8, or 10 mm. B: The radial force (RF) of each stent when the outer diameter of the compressed stent was 6, 8, or 10 mm.
Figure 4
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Figure 4 Relationship between resistance force of migration and radial force. A-C: The relationship between RFM and RF in all six stents when the outer diameter of the compressed stent was 6 (A), 8 (B), or 10 mm (C); D-F: The relationship between RFM and RF in just the five braided stents when the outer diameter of the compressed stent was 6 (D), 8 (E), or 10 mm (F). A simple linear regression model was used. RFM: Resistance force of migration; RF: Radial force.
Figure 5
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Figure 5 Relationship between resistance force of migration and taper of the flare. A-C: The relationship between RFM and TAF in all six stents when the outer diameter of the compressed stent was 6 (A), 8 (B), or 10 mm (C); D-F: The relationship between RFM and TAF in just the five braided stents when the outer diameter of the compressed stent was 6 (D), 8 (E), or 10 mm (F). A simple linear regression model was used. RFM: Resistance force of migration; TAF: Taper of the flare.