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Centre for Centre for Centre for Centre for HealthHealthHealthHealth EngineeringEngineeringEngineeringEngineeringCNRS UMR 5146 – INSERM IFR 143
Identification of the material parameters of soft tissues in thecompressed leg
Laura Dubuis, Stéphane Avril, Johan Debayle, Pierre Badel
LaMCoS - 2010/11/17 - Stéphane AVRIL
2
Introduction
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
3
VeinousVeinousVeinousVeinousVeinousVeinousVeinousVeinousdiseasesdiseasesdiseasesdiseasesdiseasesdiseasesdiseasesdiseases
SportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeople
Context
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
4
Calf: a peripheral heart
[P. Ducrozet. Booster study. PhD thesis, Université Jean Monnet, Saint Etienne, 2004][S. Couzan, P. Mismetti, S. Laporte, J.F. Pouget, E. Gauthier, D. Brisot, I. Quere, A. Leizorovicz. CE-Prog study. Saint-Étienne, 2009]
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
5
Different types of treatmentsby compression
High pressure
Lowpressure
Lowpressure
High pressure
ConventionalConventionalConventionalConventional compressioncompressioncompressioncompression(compression stockings)
(1956)
Progressive compressionProgressive compressionProgressive compressionProgressive compression(BVSport patent)
(1997)
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
6
Towards patient-specificcompression
� DeviceDeviceDeviceDevice for for for for veinousveinousveinousveinous pressure pressure pressure pressure measurementsmeasurementsmeasurementsmeasurements
� CompressionmeterCompressionmeterCompressionmeterCompressionmeter for custom compressionfor custom compressionfor custom compressionfor custom compression
���� RaisesRaisesRaisesRaises mechanicalmechanicalmechanicalmechanical issues:issues:issues:issues:� Pressure transmission from stockings to soft tissues?
� Mechanical properties of these tissues?
� Pressure field in tissues?
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
7
FE model
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
8
Geometry and meshing
Exteriorsurface
Musclesurface
Bonesurface
FE Mesh
FE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
9
Model specifications
� BoundaryBoundaryBoundaryBoundary conditionsconditionsconditionsconditions
� Bones clamped
� Pressure applied by the stocking
� Laplace law: P=T/Rc
FE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
10
Constitutive equations
[S. Avril, L. Bouten, L. Dubuis, S. Drapier, J-F. Pouget. Mixed Experimental and Numerical Approach for Characterizing the Biomechanical Response of the Human Leg Under Elastic Compression. J. Biomechanical Eng. 132, 2009.]
FE model:FE model:FE model:FE model:
� NeoNeoNeoNeo----HookeanHookeanHookeanHookean modelmodelmodelmodel
MRI slice
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
11
IdentificationFE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
12
IdentificationFE model:FE model:FE model:FE model:
Inverse problem: definition of the cost functionIntroduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
13
� IdentifiedIdentifiedIdentifiedIdentified constitutive constitutive constitutive constitutive parametersparametersparametersparameters
11601160116011601060106010601060K (K (K (K (kPakPakPakPa))))
11.511.511.511.55555CCCC10101010 ((((kPakPakPakPa))))
MuscleMuscleMuscleMuscleFatFatFatFat
HyperelasticNeo Hookean model
FE model:FE model:FE model:FE model:Identification results
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
14
FE model:FE model:FE model:FE model:Identification results
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
15
Results
� HydrostaticHydrostaticHydrostaticHydrostatic pressurepressurepressurepressure
FE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
16
Results
Great saphenous
Smallsaphenous
Anteriortibial
Posteriortibial
Fibular
FE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
17
Hydrostaticpressure (kPa)
Results
� HydrostaticHydrostaticHydrostaticHydrostatic pressure pressure pressure pressure atatatat differentdifferentdifferentdifferent locationslocationslocationslocations
Appliedpressure
Fibular
Fibular
Posteriortibial
Posteriortibial
Anteriortibial
Anteriortibial
Great saphenous
Great saphenous
Small saphenous
Slmallsaphenous
1 % 3 %
6 %
3 %
0 %
FE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
18
resultsFE model:FE model:FE model:FE model:
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
� HydrostaticHydrostaticHydrostaticHydrostatic pressure pressure pressure pressure atatatat differentdifferentdifferentdifferent heightsheightsheightsheights
LaMCoS - 2010/11/17 - Stéphane AVRIL
19
Conclusion
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
20
Prospects
� Compartments Compartments Compartments Compartments
and and and and aponeurosesaponeurosesaponeurosesaponeuroses
Interactions and sliding
� CouplingCouplingCouplingCoupling withwithwithwith veinousveinousveinousveinous bloodbloodbloodblood flow flow flow flow
Quantification of Quantification of Quantification of Quantification of drainingdrainingdrainingdraining effecteffecteffecteffect
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
LaMCoS - 2010/11/17 - Stéphane AVRIL
21
StudentsStudentsStudentsStudents: Laura Bouten & Laura Dubuis
ColleaguesColleaguesColleaguesColleagues: Pierre Badel, Johan Debayle
PhysiciansPhysiciansPhysiciansPhysicians: Serge Couzan, Jean-François Pouget
SupportSupportSupportSupport: ANR, Région Rhône-Alpes, industry
Acknowledgements
Introduction
Context
Calf: a peripheral heart
Different types of treatments by compression
Towards patient-specific compression
FE model
Geometry and meshing
Model specifications
Constitutive equations
Identification
Identification results
Results
Results
results
Conclusion
Prospects
Acknowledgements
