SELVEDGE FREE WOVEN NARROW FABRICS FOR MEDICAL APPLICATIONS

Transcription

1 SELVEDGE FREE WOVEN NARROW FABRICS FOR MEDICAL APPLICATIONS Y.-S. GLOY, C. ROSIEPEN, T. GRIES Institut für Textiltechnik der RWTH Aachen University Aachen, Germany INTERNATIONAL CONGRESS ON HEALTHCARE AND MEDICAL TEXTILES MAY 17-18, 2011 IZMIR, TURKEY

2 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 2

3 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 3

4 raw materials: natural fibers, polymers,... semi-finished textiles & products application fields The unique position of ITA Comprehensive textile process chains mobility building & living health technology and competence fields energy 4

5 Complete Process Chain Textile: textile fibers & filaments, yarn production, fabric production Technical Textiles: high performance filaments, textile fabric production, coating Nonwovens: nonwoven laying, bonding, nanofiber nonwovens Textile Preforms: singlestep-, multistep-preforming, prepregging Implants: fibre- and yarn-structuring, tissue engineering Smart Textiles: textile development, function integration Interior Textiles: carpets, home textiles, automobile interior 5

6 Technology fields Filament yarn technique: melt and solution spinning, multicomponent yarns High modulus fibers: carbon, glass, and basalt fiber development Staple fibre yarns: spinning preparation, spinning and winding processes Knitted fabrics: circular knitting, knitting, knitted spacer fabrics Broad weaving: air and picker weaving Narrow textiles: narrow weaving, braided textiles Reinforcement textiles: non crimp bi- & multiaxial fabrics, 3D-braided structures Coating: pretreatment, coating, prepregs Assembling: 1- and 2 sided stitching, welding, bonding, handling 6

7 public Strictly confidential ITA Facts and Figures Staff: 80 Scientists 40 Service personnel 150 Graduate research assistants 50 Students majoring in textile technology each year Fundamental Research ca. 30% Subsidy ca. 10% Research and development Publicity and third party funded research Academic and industrial education Industry-Related Public Funding ca. 30% Industrial Funding ca. 30% Development and transfer Direct industrial research Further education partially public Budget: ca. 9,8 Mio. 7

8 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 8

9 Narrow fabrics for medical applications - Approach Implants no adequate supply of individually-tailored patient-friendly, non-ageing implants Narrow weaving technology opportunity to fulfill such a demand defined structure and porosity defined mechanical and medical properties Approach Elaboration of the implant s requirements Transfer of the requirement into a fabric construction Production of functional models Testing of the functional models stent tubular structure spinal disk multilayer fabric artificial ligaments narrow fabric Chosen application for narrow woven fabrics 9

10 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 10

11 Elaboration of the implants requirements Requirements Biocompatibility Biostability Needed Needed Breaking Load [N] 600 to 1300 Artificial Ligament Elongation at break [%] 20 to 45 Length [mm] Up to 150 Low lumen diameter [mm] 9 to 11 Low Hysterese Needed Ingrowth of a tissue-core No elongation of structure, just elongation of material Possible Needed 11

12 Elaboration of the implants requirements Sealing of anulus fibrosus anulus fibrosus nucleus pulposus bundle of nerve fibers nerv prolapse Crack of tissue yarn curred tissue 12

13 Elaboration of the implants requirements Requirements Height x width [mm] ~3 x 15 Compression strength Tensile strength [MPa] 7-10 Sealing of annulus fibrosus Young-Modulus axial [MPa] 0,27/0,82 Elastic elongation axial [%] 25 Elongation at break % Sterilization No influence on properties Pore size [µm] Wetting angle [ ] Yarn diameter [mm] 0,15 to 1 13

14 Elaboration of the implants requirements Requirements Lumbar artificial spinal disk Height [mm] Compression strength of isolated vertebral body [MPa] Design Ø 4,6 max 10 Internal surfaces Imlant form Medtronic, Inc, Tolochenaz, Maverick, USA Braided textile implant, Kotani et. al. 14

15 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 15

16 1 2 3 Rapport Rapport Transfer of requirements into a fabric construction Artificial ligament Woven tube Polytetrafluoroethylene (PTFE) fineness of 440 dtex, (DIN EN ISO 2060), tensile strength of cn/tex elongation at break of % (DIN EN ISO 2062) Polyethylene terephthalate (PET) Multifilament fineness of 113 dtex f64 (DIN EN ISO 2060) tensile strength of 88.6 cn/tex elongation at break of 9.23 % (DIN EN ISO 2062). Monofilament yarns fineness of 159 and 178 dtex (DIN EN ISO 2060), tensile strength of cn/tex and cn/tex, and elongation at break of % 3and % (DIN EN ISO Schussfaden 2062) Schäfte Bindungspatrone Weave pattern warp Kettfäden Schlauchquerschnitt Cross section weft Weave Schäfte pattern Bindungspatrone Weave pattern Visualised fabric Visualisiertes Gewebe Visualised fabrics 16

17 Rappiort 5 6 Rapport Transfer of requirements into a fabric construction Sealing of annulus fibrosus Falschdreherbindung Waffelbindung Distance fabric Polylactic acid (PLA) fineness of 162 dtex f72 (DIN EN ISO 2060) tensile strength of cn/tex elongation at break of % (DIN EN ISO 2062). Schäfte Polyvinylidene fluoride (PVDF) fineness of 240 dtex f72 (DIN EN ISO 2060), tensile strength of cn/tex elongation at break % (DIN EN ISO 2062) Schäfte Weave pattern Nucleus Pulposus Anulus-Fibrosus Fabric structure 17 PVDF PLA

18 Transfer of requirements into a fabric construction Sealing of annulus fibrosus Distance fabric Nucleus Pulposus PVDF Anulus-Fibrosus - PLA 18

19 Rapport Transfer of requirements into a fabric construction Lumbar artificial spinal disk Multilayer fabrics Material: Ultra-high-molecular-weight polyethylene 3 versions 4 Layer fabric with V-Pile 5 Layers fabric 5 Layer fabric with flotation of yarns 1.Lage layer 2.Lage layer 3.Lage layer 4.Lage 4.. layer 8 9 Visualised fabric Polfaden pile Schäfte Weave pattern 19

20 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 20

21 Production of functional models Shuttle loom takeoff takeoff healds reed shuttle creel 21

22 Production of functional models Narrow velvet loom creel bobbin break healds needels takeoff weft bobbins bobbin brake creel fabric formation take-off 22

23 Production of functional models Produced fabrics woven tubes 23

24 Production of functional models Produced fabrics distance fabrics Warp Weft Pile 24

25 Production of functional models Produced fabrics multilayer fabrics 5 Layers fabric 5 Layers fabric with flotation 4 Layer fabric with V-Pile 25

26 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 26

27 Force F [N] Force [N] Testing of functional models Artificial ligament tensile test 2200, , , , , PTFE PET PET Upper Load 1200, ,00 800,00 600,00 400, PET PET Lower Load 200,00 Change of weft density 0,00 0,00 10,00 20,00 30,00 40,00 Elongation ε [%] 27

28 Testing of functional models Requirements Result Biocompatibility Needed Given Bio-stability Needed Given Breaking Load t [N] 600 to 1300 Given Artificial Ligament Elongation at break [%] 20 to 45 Given Length [mm] Up to 150 Up to 150 Low lumen diameter [mm] 9 to 11 9 to 11 Low Hysterese Needed No research Ingrowth of a tissue-core Possible No research No elongation of structure, just elongation of material Needed Given (woven structure) 28

29 Testing of functional models Sealing of annulus fibrosus Requirements Result Height x width [mm] ~3 x 15 2,6 x 14,1 Compression strength ,35 Tensile strength [MPa] ,63 Young-Modulus axial [MPa] 0,27/0,82 2,93 Elastic elongation axial [%] Elongation at break % 47,90 Sterilization No influence on properties No influence on properties Pore size [µm] ,53 Wetting angle [ ] Yarn diameter [mm] 0,15 to 1 0,2 29

30 Elongation Dehnung ε ε [%] Testing of functional models Artificial ligament compression test (height too low) Sample Modell 1 Sample Modell 2 Sample Modell 3 Target area Zielbereich F 0.05 F Druckfestigkeit [N/mm²] σ [N/mm 2 ] Compression strength σ [N/mm 2 ] 30

31 Content Institut für Textiltechnik of RWTH Aachen University Narrow fabrics for medical applications Approach Elaboration of the implants requirements Transfer of requirements into a fabric construction Production of functional models Testing of functional models Summary and outlook 31

32 Summary and outlook Summary Production of implants by narrow weaving technology is possible General usability of narrow woven fabrics for the chosen applications By changing weaving parameters, mechanical or medical properties can be adapted Customization of implants depending on patient needs is possible stent tubular structure spinal disk multilayer fabric artificial ligaments narrow fabric application produced functional models Outlook Research is needed to produce fully usable implant 32

33 Acknowledgements We thank the Forschungsvereinigung Forschungs-kuratorium Textil e.v. for the financal support of the research project AiF- No N, ( Wirkkantenfreie 3D-Bandgewebe - Entwicklung von Funktionsmodellen für die Medizintechnik ), which occured in the program for the sponsorship of the Industriellen Gemeinschaftsforschung (IGF) from funds of the Bundesministerium für Wirtschaft und Technologie (BMWi) through the Arbeitsgemeinschaft industrieller Forschungsvereinigungen e.v. (AiF) Furthermore we thank the companies G. Krahmer GmbH, Buchholz, Germany and MAGEBA Textilmaschinen GmbH & Co. KG, Bernkastel-Kues, Germany for theirs support 33

34 4th WORLD CONFERENCE ON 3D FABRICS AND THEIR APPLICATIONS September 10th 12th, RWTH Aachen University, Aachen, Germany Organised by TexEng Software Ltd, Manchester UK and Institut für Textiltechnik der RWTH Aachen, Germany, in association with The University of Manchester Conference Co-Chairs: Professor John W S Hearle, Professor Thomas Gries, ir Geert de Clercq 34

35 Thank you very much for your attention Dipl.-Ing. Yves-Simon Gloy Institut für Textiltechnik der RWTH Aachen University Otto-Blumenthal-Str Aachen, Germany Tel.: Fax: Weaving kids Source: Aachener Nachrichten 35