Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer
As the market for minimally invasive surgery has grown, the demand for high-precision and high-performance catheters has increased. Catheters for the diagnosis and treatment of cardiovascular or cerebrovascular disease mainly use a braided wire tube with a polymer inner liner and outer jacket to imp...
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doaj-9adc6ca39b8a4d45a54695649a065e2f2020-11-25T03:29:09ZengMDPI AGPolymers2073-43602020-07-01121628162810.3390/polym12081628Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic ElastomerSoonmo Cho0Euntaek Lee1Seunggi Jo2Gyuman Kim3Woojin Kim4Safety System R&D Group, Korea Institute of Industrial Technology, 320 Techno-sunhwan-ro, Yuga-myeon, Dalseong-gun, Daegu 711-880, KoreaMechanical System Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, KoreaSafety System R&D Group, Korea Institute of Industrial Technology, 320 Techno-sunhwan-ro, Yuga-myeon, Dalseong-gun, Daegu 711-880, KoreaSchool of Mechanical Engineering, Kyungpook National University, #1370 Sangyuk-dong, Buk-gu, Daegu 702-701, KoreaSafety System R&D Group, Korea Institute of Industrial Technology, 320 Techno-sunhwan-ro, Yuga-myeon, Dalseong-gun, Daegu 711-880, KoreaAs the market for minimally invasive surgery has grown, the demand for high-precision and high-performance catheters has increased. Catheters for the diagnosis and treatment of cardiovascular or cerebrovascular disease mainly use a braided wire tube with a polymer inner liner and outer jacket to improve the pushability and trackability. The outer jacket should have an accurate inner and outer diameter and while maintaining a wall thickness of 150 µm or less. In this study, we designed and manufactured a tip and die capable of extruding an outer jacket with a wall thickness of 150 µm or less using a medical thermoplastic elastomer for manufacturing 8Fr (2.64 mm diameter) thin-walled tubes. The ovality and inner/outer diameters of the tube were studied according to changes in the screw speed (mass flow rate), puller speed, air pressure applied to the lumen, and distance between the quench and head, which are the main variables of microextrusion processes. The screw speed (mass flow rate), puller speed, and air pressure affected the inner/outer diameter of the tube, with screw speed and puller speed having the largest influence on diameter. The air pressure and distance between quench and head had the greatest influence on ovality. The results show the effect of different processing parameters on the characteristics of the extruded tube, which will help to establish a stable extrusion process for the manufacture of outer jackets for braided catheter shafts.https://www.mdpi.com/2073-4360/12/8/1628polymer extrusionthermoplastic elastomercatheterthin walled tube |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Soonmo Cho Euntaek Lee Seunggi Jo Gyuman Kim Woojin Kim |
spellingShingle |
Soonmo Cho Euntaek Lee Seunggi Jo Gyuman Kim Woojin Kim Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer Polymers polymer extrusion thermoplastic elastomer catheter thin walled tube |
author_facet |
Soonmo Cho Euntaek Lee Seunggi Jo Gyuman Kim Woojin Kim |
author_sort |
Soonmo Cho |
title |
Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer |
title_short |
Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer |
title_full |
Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer |
title_fullStr |
Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer |
title_full_unstemmed |
Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer |
title_sort |
extrusion characteristics of thin walled tubes for catheters using thermoplastic elastomer |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2020-07-01 |
description |
As the market for minimally invasive surgery has grown, the demand for high-precision and high-performance catheters has increased. Catheters for the diagnosis and treatment of cardiovascular or cerebrovascular disease mainly use a braided wire tube with a polymer inner liner and outer jacket to improve the pushability and trackability. The outer jacket should have an accurate inner and outer diameter and while maintaining a wall thickness of 150 µm or less. In this study, we designed and manufactured a tip and die capable of extruding an outer jacket with a wall thickness of 150 µm or less using a medical thermoplastic elastomer for manufacturing 8Fr (2.64 mm diameter) thin-walled tubes. The ovality and inner/outer diameters of the tube were studied according to changes in the screw speed (mass flow rate), puller speed, air pressure applied to the lumen, and distance between the quench and head, which are the main variables of microextrusion processes. The screw speed (mass flow rate), puller speed, and air pressure affected the inner/outer diameter of the tube, with screw speed and puller speed having the largest influence on diameter. The air pressure and distance between quench and head had the greatest influence on ovality. The results show the effect of different processing parameters on the characteristics of the extruded tube, which will help to establish a stable extrusion process for the manufacture of outer jackets for braided catheter shafts. |
topic |
polymer extrusion thermoplastic elastomer catheter thin walled tube |
url |
https://www.mdpi.com/2073-4360/12/8/1628 |
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