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KMID : 0386119980390030497
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Journal of the Korean Radiological Society
1998 Volume.39 No. 3 p.497 ~ p.502
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Mechanical Characteristics of Self-expandable Metallic Stents : In Vitro Study with Tree Types of Stress
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Lee Byung-Hee
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Abstract
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Purpose : To obtain objective and comparable data for mechanical characteristics of self-expandable metallic stents widely used in the treatment of biliary obstruction.
Materials and Methods : The stents tested were the 6 and 8mm-band Hanaro spiral stent, Gianturco-R sch Z stent, Wallstent, Ultraflex stent, and Memotherm stent. Each was subjected to three types of load : point, area, and circular. We analyzed their mechanical characteristics (resistance force, expansile force, and elasticity) according to
these three types of stress.
Results : With regard to point loads, the Memotherm stent showed the highest resistance force and expansile force. The 8mm-band Hanaro stent showed the lowest resistance force and the Gianturco-R sch Z stent and Ultraflex stent showed lower expansile force. With regard to area loads, the Ultraflex stent showed the highest resistance force. The 6mm-band Hanaro scent, Gianturco-R sch Z stent, and Ultraflex stent showed higher expansile force. The 8mm-band Hanaro stent showed the lowest value in both resistance force and expansile force. For circular loads, the Memotherm
stent showed the highest resistance force and the Ultraflex stent and Wallstent showed lower value. Under all types of stress, the Hanaro stent and Memotherm stent were completely elastic, and the Ultraflex stent and Wallstent showed a wide gap between resistance force and expansile force.
Conclusion : In clinical practice, awareness of the mechanical characteristics of each stent might help in choosing the one which is most suitable, according to type of biliary obstruction.
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KEYWORD
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Scents and prostheses,
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