SELVEDGE FREE WOVEN NARROW FABRICS FOR MEDICAL...
Transcript of SELVEDGE FREE WOVEN NARROW FABRICS FOR MEDICAL...
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
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
Content
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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
Content
3
The unique position of ITA
ap
plic
ati
on
fie
lds
mobility
building &
living
health
energy
Comprehensive textile
process chains
technology and
competence fields
raw
mate
rials
:
natu
ral fi
bers
, p
oly
mers
,...
sem
i-fi
nis
hed
texti
les &
pro
du
cts
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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
Complete Process Chain
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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
Technology fields
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ITA – Facts and Figures
Budget: ca. 9,8 Mio. €
Staff:
80 Scientists
40 Service personnel
150 Graduate research assistants
50 Students majoring in textile
technology each year
Research and development
Publicity and third party
funded research
Academic and industrial education
Development and transfer
Direct industrial research
Further education
partially public public
Str
ictly c
onfidential
Fundamental
Research
ca. 30%
Industrial
Funding
ca. 30%
Industry-Related
Public Funding
ca. 30%
Subsidy
ca. 10%
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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
Content
8
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
Chosen application for narrow woven fabrics
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stenttubular structure
spinal diskmultilayer fabric
artificial ligaments
narrow fabric
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
Content
10
Elaboration of the implants requirements
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Artificial
Ligament
Requirements
Biocompatibility Needed
Biostability Needed
Breaking Load [N] 600 to 1300
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 Possible
No elongation of structure, just
elongation of material Needed
Elaboration of the implants requirements
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nucleus
pulposus
anulus fibrosus
prolapse
bundle of nerve fibers
nerv
Sealing of anulus fibrosus
yarn Crack of tissue curred tissue
Elaboration of the implants requirements
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Sealing of
annulus
fibrosus
Requirements
Height x width [mm] ~3 x 15
Compression strength 10-13
Tensile strength [MPa] 7 - 10
Young-Modulus axial [MPa] 0,27/0,82
Elastic elongation axial [%] ≥ 25
Elongation at break ≥ 20 - 30 %
Sterilization No influence on properties
Pore size [µm] 200 – 1200
Wetting angle [°] 55 – 80
Yarn diameter [mm] 0,15 to 1
Elaboration of the implants requirements
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Lumbar
artificial
spinal disk
Requirements
Height [mm] 10 - 15
Compression strength of isolated
vertebral body [MPa] Ø 4,6 max 10
Design Internal surfaces
Imlant form Medtronic, Inc,
Tolochenaz, Maverick, USA Braided textile implant,
Kotani et. al.
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
Content
15
Transfer of requirements into a fabric construction
Artificial ligament
Woven tube
Polytetrafluoroethylene (PTFE)
fineness of 440 dtex , (DIN EN ISO 2060),
tensile strength of 38.86 cN/tex
elongation at break of 10.49 % (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 46.93 cN/tex and 47.17 cN/tex, and
elongation at break of 21.01 % and 20.98 % (DIN EN ISO 2062)
Weave pattern
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87
65
43
21
1 2 3 4
Schäfte
Ra
pp
ort
Kettfäden
Schussfaden
Visualisiertes GewebeBindungspatrone Schlauchquerschnitt Visualised fabricsWeave pattern
warp
weft
Cross section
87
65
43
21
1 2 3 4
Schäfte
Ra
pp
ort
Kettfäden
Schussfaden
Visualisiertes GewebeBindungspatrone Schlauchquerschnitt Visualised fabricsWeave pattern
warp
weft
Cross sectionVisualised fabric
Transfer of requirements into a fabric construction
Sealing of annulus fibrosus
Distance fabric
Polylactic acid (PLA)
fineness of 162 dtex f72 (DIN EN ISO 2060)
tensile strength of 15.09 cN/tex
elongation at break of 62.04 % (DIN EN ISO 2062).
Polyvinylidene fluoride (PVDF)
fineness of 240 dtex f72 (DIN EN ISO 2060),
tensile strength of 19.49 cN/tex
elongation at break 88.56 % (DIN EN ISO 2062)
Weave pattern
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Fabric structure
Falschdreherbindung Waffelbindung
10
98
76
54
32
11 2 3 4 5 6 7 8 9 10
Schäfte
Ra
pp
iort
87
65
43
21
1 2 3 4 5 6 7 8 9 10
Schäfte
Ra
pp
ort
Anulus-Fibrosus
Nucleus Pulposus
PVDF
PLA
Transfer of requirements into a fabric construction
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Falschdreherbindung Waffelbindung
10
98
76
54
32
1
1 2 3 4 5 6 7 8 9 10
Schäfte
Ra
pp
iort
87
65
43
21
1 2 3 4 5 6 7 8 9 10
Schäfte
Ra
pp
ort
Sealing of annulus fibrosus
Distance fabric
Nucleus Pulposus – PVDF
Anulus-Fibrosus - PLA
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
Weave pattern
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Visualised fabric
1.Lage
2.Lage
3.Lage
4.Lage
Polfaden
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98
76
54
32
1
1 2 3 4 5 6 7 8 9
Schäfte
Ra
pp
ort
pile
1. layer
2. layer
3. layer
4.. layer
1.Lage
2.Lage
3.Lage
4.Lage
Polfaden
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11
10
98
76
54
32
1
1 2 3 4 5 6 7 8 9
Schäfte
Ra
pp
ort
pile
1. layer
2. layer
3. layer
4.. layer
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
Content
20
Production of functional models
Shuttle loom
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creel
reed
shuttle
take-
off
take-
off healds
Production of functional models
Narrow velvet loom
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creel
take-off weft
bobbins
bobbin
brake
creel bobbin
break
take-
off
healds needels
fabric formation
Production of functional models
Produced fabrics – woven tubes
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Production of functional models
Produced fabrics – distance fabrics
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Warp
Weft
Pile
Production of functional models
Produced fabrics – multilayer fabrics
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4 Layer fabric with V-Pile 5 Layers fabric 5 Layers fabric
with flotation
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
Content
26
Testing of functional models
Artificial ligament – tensile test
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0,00
200,00
400,00
600,00
800,00
1000,00
1200,00
1400,00
1600,00
1800,00
2000,00
2200,00
0,00 10,00 20,00 30,00 40,00
Fo
rce
[N
]
Elongation [%]
01-001 PTFE 01-008 PET
01-005 PET
02-001 PET
02-004 PET
Upper Load
Lower Load
Fo
rce
F [
N]
Elongation ε [%]
Change of weft density
Testing of functional models
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Artificial
Ligament
Requirements Result
Biocompatibility Needed Given
Bio-stability Needed Given
Breaking Load t [N] 600 to 1300 Given
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)
Testing of functional models
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Sealing of
annulus
fibrosus
Requirements Result
Height x width [mm] ~3 x 15 2,6 x 14,1
Compression strength 10-13 7,35
Tensile strength [MPa] 7 - 10 10,63
Young-Modulus axial [MPa] 0,27/0,82 2,93
Elastic elongation axial [%] ≥ 25 ≥ 25
Elongation at break ≥ 20 - 30 % 47,90
Sterilization No influence on
properties
No influence on
properties
Pore size [µm] 200 – 1200 336,53
Wetting angle [°] 55 – 80 0°
Yarn diameter [mm] 0,15 to 1 0,2
Testing of functional models
Artificial ligament – compression test (height too low)
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Druckfestigkeit [N/mm²]
0.5 1 1.5 2 2.5 3 3.5
0.3
0.2
0.05
0
Dehnung
0.25
0.15
0.1
Model 1
Model 2
Model 3
Zielbereich
Dehnung
ε
Druckfestigkeit σ [N/mm2]
F
F
Modell 1
Modell 2
Modell 3
Elo
ng
atio
n ε
[%]
Compression strength σ [N/mm2]
Target areaSample 1
Sample 2
Sample 3
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
Content
31
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
Outlook
Research is needed to produce
fully usable implant
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stenttubular structure
spinal diskmultilayer fabric
artificial ligaments
narrow fabric
application
produced functional models
Acknowledgements
We thank the Forschungsvereinigung Forschungs-kuratorium
Textil e.V. for the financal support of the research project AiF-
No. 16322 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
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4th WORLD CONFERENCE ON 3D FABRICS AND
THEIR APPLICATIONS
September 10th – 12th, 2012 - 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
http://www.texeng.co.uk/
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Thank you very much for your attention
Dipl.-Ing. Yves-Simon Gloy
Institut für Textiltechnik der RWTH Aachen University
Otto-Blumenthal-Str.1
52074 Aachen, Germany
Tel.: +49 241 8023470 Fax: +49 241 22422
Weaving kids
Source: Aachener Nachrichten
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