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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

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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


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VeinousVeinousVeinousVeinousVeinousVeinousVeinousVeinousdiseasesdiseasesdiseasesdiseasesdiseasesdiseasesdiseasesdiseases

SportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeople

Context

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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[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




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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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




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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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




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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FE model

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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Exteriorsurface

Musclesurface

Bonesurface

FE Mesh

FE model:FE model:FE model:FE model:

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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� BoundaryBoundaryBoundaryBoundary conditionsconditionsconditionsconditions

� Bones clamped

� Pressure applied by the stocking

� Laplace law: P=T/Rc


Introduction

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FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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[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.]


� NeoNeoNeoNeo----HookeanHookeanHookeanHookean modelmodelmodelmodel

MRI slice

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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IdentificationFE model:FE model:FE model:FE model:

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


12

IdentificationFE model:FE model:FE model:FE model:

Inverse problem: definition of the cost functionIntroduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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� 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




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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FE model:FE model:FE model:FE model:Identification results

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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Results

� HydrostaticHydrostaticHydrostaticHydrostatic pressurepressurepressurepressure


Introduction

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FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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Results

Great saphenous

Smallsaphenous

Anteriortibial

Posteriortibial

Fibular


Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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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 %


Introduction

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FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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resultsFE model:FE model:FE model:FE model:

Introduction

Context




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements

� HydrostaticHydrostaticHydrostaticHydrostatic pressure pressure pressure pressure atatatat differentdifferentdifferentdifferent heightsheightsheightsheights


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Conclusion

Introduction

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FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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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




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements


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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




FE model




Identification


Results

Results

results

Conclusion

Prospects

Acknowledgements

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