Centre for Centre for HealthHealthHealthEngineering

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

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

Conclusion

Prospects

Acknowledgements

VeinousVeinousVeinousVeinousVeinousVeinousVeinousVeinousdiseasesdiseasesdiseasesdiseasesdiseasesdiseasesdiseasesdiseases

SportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeopleSportspeople

Context

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

[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

Conclusion

Prospects

Acknowledgements

Different types of treatmentsby compression

High pressure

Lowpressure

High pressure

ConventionalConventionalConventionalConventional compressioncompressioncompressioncompression(compression stockings)

(1956)

Progressive compressionProgressive compressionProgressive compressionProgressive compression(BVSport patent)

(1997)

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

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

Conclusion

Prospects

Acknowledgements

FE model

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

Exteriorsurface

Musclesurface

Bonesurface

FE Mesh

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

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

� BoundaryBoundaryBoundaryBoundary conditionsconditionsconditionsconditions

� Bones clamped

� Pressure applied by the stocking

� Laplace law: P=T/Rc

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

[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

Conclusion

Prospects

Acknowledgements

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

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

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

Inverse problem: definition of the cost functionIntroduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

� 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

Conclusion

Prospects

Acknowledgements

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

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

Results

� HydrostaticHydrostaticHydrostaticHydrostatic pressurepressurepressurepressure

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

Results

Great saphenous

Smallsaphenous

Anteriortibial

Posteriortibial

Fibular

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

Hydrostaticpressure (kPa)

Results

� HydrostaticHydrostaticHydrostaticHydrostatic pressure pressure pressure pressure atatatat differentdifferentdifferentdifferent locationslocationslocationslocations

Appliedpressure

Fibular

Posteriortibial

Anteriortibial

Great saphenous

Small saphenous

Slmallsaphenous

1 % 3 %

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

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

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

� HydrostaticHydrostaticHydrostaticHydrostatic pressure pressure pressure pressure atatatat differentdifferentdifferentdifferent heightsheightsheightsheights

Conclusion

Introduction

Context

FE model

Identification

Results

results

Conclusion

Prospects

Acknowledgements

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

Conclusion

Prospects

Acknowledgements

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

Conclusion

Prospects

Acknowledgements

Centre for Centre for HealthHealthHealthEngineering

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