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SIMULERA BELASTNING AV MJUKDELAR
LIGTHer Seminarium Jönköping 3 Okt 2019
Sara Kallin CPO, Tekn. Lic, doktorandTekniska högskolan & HälsohögskolanJönköping University
MJUKDELSVÄVNADER - EXEMPEL
Sara Kallin
Wikimedia commons, Madhero88, https://commons.wikimedia.org/wiki/File:Skin_layers.png
Wikimedia Commons, National Institutes of Health, https://commons.wikimedia.org/wiki/File:Skeletal_muscle.png
RAMVERK FÖRSTÅ UTVECKLINGTRYCKSÅR
Figure 3 p. 2232 in Coleman, S., Nixon, J., Keen, J., Wilson, L., McGinnis, E., Dealey, C., . . . Nelson, E. A. (2014). A new pressure ulcer conceptualframework. Journal of Advanced Nursing, 70(10), 2222-2234. Sara Kallin, 3 Okt 2019
DEEP TISSUE INJURY, DTI
• Töjning• Långsam, moderat töjning:
Kärl stängs => Metabolism ändras => Ansamling restprodukter =>pH sjunker => CELLDÖD
• Snabb, stor töjning:Deformation av celler => cell strukturen skadas, cellmembran, cytoskeleton => CELLDÖD
2-4 h
10 min
(Oomens, Bader, Loerakker, & Baaijens, 2015)
Synthesis of previous studiesTissue constructs and Animal studies
Sara Kallin, 3 Okt 2019
• Plantara mjukdelsvävnader hos diabetiker är mindre elastiska än hos icke-diabetiker (Ledoux, 2015, Pai & Ledoux, 2012)
• Huden mer elastisk hos yngre än hos äldre, friktionen hud-textilyta oberoende av kön och ålder (Gerhardt et al 2009)
VARIERANDE VÄVNADSEGENSKAPER
Sara Kallin, 3 Okt 2019
FINITA ELEMENT METODEN, FEM
FinitaElement Analys
Geometrier
Material egenskaper
Randvillkor
Sara Kallin, 3 Okt 2019
BÄCKEN, SITTSÅRLinder-Ganz, E., Yarnitzky, G., Yizhar, Z., Siev-Ner, I., & Gefen, A. (2009). Real-time finite element monitoring of sub-dermal tissuestresses in individuals with spinal cord injury: toward prevention of pressure ulcers. Annals of Biomedical Engineering, 37(2), 387-400.
EXEMPEL FINITA ELEMENT ANALYS (FEA) FÖR MJUKDELAR
Sara Kallin, 3 Okt 2019
FOT-ORTOSER för knäproblemLiu, X., & Zhang, M. (2013). Redistribution of knee stress using laterally wedged insole intervention: Finite element analysis of knee-ankle-foot complex. Clinical Biomechanics, 28(1), 61-67.
VÄVNADER i amputationsstumpPortnoy, S., Yizhar, Z., Shabshin, N., Itzchak, Y., Kristal, A., Dotan-Marom, Y., . . . Gefen, A. (2008). Internal mechanical conditions in the soft tissues of a residual limb of a trans-tibial amputee. JOURNAL OF BIOMECHANICS, 41(9), 1897-1909.
VÄVNADER i amputationsstump, Utvärdering påverkan av gångunderlagPortnoy, S., van Haare, J., Geers, R. P. J., Kristal, A., Siev-Ner, I., Seelen, H. A. M., . . . Gefen, A. (2010). Real-time subject-specific analyses of dynamic internal tissue loads in the residual limb of transtibial amputees. Medical Engineering & Physics, 32(4), 312-323.
VÄVNADER i amputationsstump, Utvärdering protesfötterPortnoy, S., Kristal, A., Gefen, A., & Siev-Ner, I. (2012). Outdoor dynamic subject-specific evaluation of internal stresses in the residual limb: Hydraulic energy-stored prosthetic foot compared to conventional energy-stored prosthetic feet. Gait & Posture, 35(1), 121-125.
VÄVNADER i amputationsstump, Utvärdering olika linerCagle, J. C., Reinhall, P. G., Allyn, K. J., McLean, J., Hinrichs, P., Hafner, B. J., & Sanders, J. E. (2018). A finite element model to assess transtibial prosthetic sockets with elastomeric liners. Medical & Biological Engineering & Computing, 56(7), 1227-1240.
FEA Mänskliga mjukdelar
FinitaElement Analys
Geometrier
Material egenskaper
Randvillkor
Förenklade material-modellerBegränsad data
Sammanslagna lagerFörenklade former
StatikFörenklade laster
Sara Kallin, 3 Okt 2019
FEA Mänskliga mjukdelar
FinitaElement Analys
Geometrier
Material egenskaper
Randvillkor
Förenklade material-modellerBegränsad data
Sammanslagna lagerFörenklade former
StatikFörenklade laster
Hur tillförlitliga resultat?
Förenklat förmycket?
Sara Kallin, 3 Okt 2019
MULTIDISCIPLINÄRT FORSKNINGSPROJEKT
Sara Kallin, 3 Okt 2019
Långsiktigt mål: Förebygga trycksår och djupa vävnadsskador genom attoptimera kroppsnära produkter
EN BÖRJAN…• Undersöka mekaniska konsekvenser av olika
vävnadsrepresentation i en simuleringsmodell av underben (Study I)
• Aim: To investigate the mechanical effects of two sets of representations for lower leg soft tissues exposed to external load
Sara Kallin, 3 Okt 2019
Modell underben
Kallin, S., Rashid, A., Salomonsson, K., Hansbo, P., in manuscript
Sara Kallin, 3 Okt 2019
Studie I
5 vs 6 material:
Fascia ochMuskel
Kombineradevs Separata
FEA:Abaqus 6.14-3/Standard Plane strainElement: CPE8H, CPE6H, 26 330stKallin, S. ©
Kallin, S. ©
Last: Proteshylse-geometrier
Kallin et al, in manuscript, Kallin (2019)
• Total Contact Concept (TC)• Total surface bearing (TSB)• Hydrostatic socket (HS)
(Fergason & Smith, 1999)
Hylsor 4.5 mm, material PETG
Sara Kallin, 3 Okt 2019
Studie I
Kallin, S. ©
Sara Kallin, 3 Okt 2019
MaterialOgden Strain Energy function:
𝑈𝑈 = ∑𝑖𝑖=1𝑁𝑁 𝜇𝜇𝑖𝑖𝛼𝛼𝑖𝑖
(𝜆𝜆1𝛼𝛼𝑖𝑖 + 𝜆𝜆2
𝛼𝛼𝑖𝑖 + 𝜆𝜆3𝛼𝛼𝑖𝑖 − 3) + ∑𝑖𝑖=1𝑁𝑁 1
𝐷𝐷𝑖𝑖𝐽𝐽𝑒𝑒𝑒𝑒 − 1 2𝑖𝑖
Yeoh polynomial:
𝑈𝑈 = �𝑖𝑖=1
3𝐶𝐶𝑖𝑖0(𝐼𝐼1 − 3)𝑖𝑖
Studie I
Kallin, S. ©
Sara Kallin, 3 Okt 2019
MaterialOgden Strain Energy function:
𝑈𝑈 = ∑𝑖𝑖=1𝑁𝑁 𝜇𝜇𝑖𝑖𝛼𝛼𝑖𝑖
(𝜆𝜆1𝛼𝛼𝑖𝑖 + 𝜆𝜆2
𝛼𝛼𝑖𝑖 + 𝜆𝜆3𝛼𝛼𝑖𝑖 − 3) + ∑𝑖𝑖=1𝑁𝑁 1
𝐷𝐷𝑖𝑖𝐽𝐽𝑒𝑒𝑒𝑒 − 1 2𝑖𝑖
Yeoh polynomial:
𝑈𝑈 = �𝑖𝑖=1
3𝐶𝐶𝑖𝑖0(𝐼𝐼1 − 3)𝑖𝑖
Studie I
Kallin, S. Deformation of human tissues –experimental and numerical aspects, 2019 p.41
Kallin, S. ©
Separate
Combined
TC TSB HS
Effektiv spänningRESULTAT
Sara Kallin, 3 Okt 2019
Studie I
Kallin, S. ©
Kallin et al, (in manuscript), Kallin (2019)
Separate
Combined
TC TSB HS
Skjuv-töjning
Sara Kallin, 3 Okt 2019
Studie IRESULTAT
Kallin, S. ©
Kallin et al, in manuscript, Kallin (2019)
Sara Kallin, 3 Okt 2019
RESULTATKontakt-tryck
Kallin, S. ©
Kallin et al, in manuscript, Kallin (2019)
NIVÅER
Sara Kallin, 3 Okt 2019
Studie I
Combined max: 2,27 kPa
Skjuvspänning muskler (HS)
Kallin, S. ©
Kallin, S. ©
Sara Kallin, 3 Okt 2019
Studie I
Combined max: 2,27 kPa
Detailed max: 2,95 kPa
Skjuvspänning muskler (HS)NIVÅER
Kallin, S. ©
Kallin, S. ©
RELATIV SKILLNAD BETYDANDE
Sara Kallin, 3 Okt 2019
Studie I
Kallin, S. ©
Kallin et al, in manuscript, Kallin (2019)
NIVÅER
Sara Kallin, 3 Okt 2019
Studie ICombined max: 2,27 kPa
Detailed max: 2,95 kPa
Detailed samma plats: 0,010 kPa
Combined samma plats: 0,340 kPa
Skjuvspänning muskler (HS)
Kallin, S. ©
Kallin, S. ©
Sara Kallin, 3 Okt 2019
RELATIV SKILLNAD PER PLATS: SPÄNNING
Kallin, S. ©
Kallin et al, in manuscript, Kallin (2019)
Sara Kallin, 3 Okt 2019
RELATIV SKILLNAD PER PLATS: TÖJNING
Kallin, S. ©
Kallin et al, in manuscript, Kallin (2019)
Sara Kallin, 3 Okt 2019
⇒ Separata vävnadslager och material i modeller VIKTIGT
⇒ Tolka FEA med försiktighet
UTVECKLA UNDERLAGEN FÖR FEA• Identifiera vävnadslager och typer• Bestämma individspecifika materialegenskaper med
relevanta experiment och materialmodeller• Realistiska lastfall
• Validera simuleringsmodeller• Simulera individspecifika
situationer
A B
Sara Kallin, 3 Okt 2019
Kallin, S. ©
INTEGRERA I PROCESSER
• MR/CT för geometri• Modellering och simulering• Tillverkning• Utvärdering
Exempel:
Colombo, G., Rizzi, C., Regazzoni, D., & Vitali, A. (2018). 3D interactive environment for the design of medical devices. International Journal of Interactive Design and Manufacturing - Ijidem, 12(2), 699-715. doi:10.1007/s12008-018-0458-8
Sara Kallin, 3 Okt 2019
REFERENSERCagle, J. C., Reinhall, P. G., Allyn, K. J., McLean, J., Hinrichs, P., Hafner, B. J., & Sanders, J. E. (2018). A finite element model to assess transtibial prosthetic sockets with elastomeric liners. Medical & Biological Engineering & Computing, 56(7), 1227-1240.
Coleman, S., Nixon, J., Keen, J., Wilson, L., McGinnis, E., Dealey, C., . . . Nelson, E. A. (2014). A new pressure ulcer conceptual framework. Journal of Advanced Nursing, 70(10), 2222-2234.
Colombo, G., Rizzi, C., Regazzoni, D., & Vitali, A. (2018). 3D interactive environment for the design of medical devices. International Journal of Interactive Design and Manufacturing - Ijidem, 12(2), 699-715. doi:10.1007/s12008-018-0458-8
Gerhardt, L. C., Lenz, A., Spencer, N. D., Münzer, T., & Derler, S. (2009). Skin-textile friction and skin elasticity in young and aged persons. Skin Research And Technology: Official Journal Of International Society For Bioengineering And The Skin (ISBS) [And] International Society For Digital Imaging Of Skin (ISDIS) [And] International Society For Skin Imaging (ISSI), 15(3), 288-298. doi:10.1111/j.1600-0846.2009.00363.x
Kallin, S., Rashid, A., Salomonsson, K., & Hansbo, P. (2019, 2019 July 31). Comparison of mechanical conditions in a lower leg model with 5 or 6 tissue types while exposed to prosthetic sockets applying finite element analysis [Preprint]. Manuscript Research paper. (1907.13340). arXiv.org, arXiv.org: 1907.13340.
Kallin, S. (2019). Deformation of human soft tissues : Experimental and numerical aspects. (049 Licentiate thesis, monograph), Jönköping University, School of Engineering, Jönköping. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45653 DiVA database.
Ledoux, W. R. (2015). The Biomechanics of Aging and Diabetic Plantar Soft Tissue. In B. Derby & R. Akhtar (Eds.), Mechanical Properties of Aging Soft Tissues (pp. 187-206). Cham: Springer International Publishing.
Linder-Ganz, E., Yarnitzky, G., Yizhar, Z., Siev-Ner, I., & Gefen, A. (2009). Real-time finite element monitoring of sub-dermal tissue stresses in individuals with spinal cord injury: toward prevention of pressure ulcers. Annals of Biomedical Engineering, 37(2), 387-400.
Liu, X., & Zhang, M. (2013). Redistribution of knee stress using laterally wedged insole intervention: Finite element analysis of knee-ankle-foot complex. Clinical Biomechanics, 28(1), 61-67.
Oomens, C. W. J., Bader, D. L., Loerakker, S., & Baaijens, F. (2015). Pressure induced deep tissue injury explained. Annals of Biomedical Engineering, 43(2), 297-305. doi:10.1007/s10439-014-1202-6
Pai, S., & Ledoux, W. R. (2012). The shear mechanical properties of diabetic and non-diabetic plantar soft tissue. JOURNAL OF BIOMECHANICS, 45(2), 364-370. doi:10.1016/j.jbiomech.2011.10.021
Portnoy, S., Kristal, A., Gefen, A., & Siev-Ner, I. (2012). Outdoor dynamic subject-specific evaluation of internal stresses in the residual limb: Hydraulic energy-stored prosthetic foot compared to conventional energy-stored prosthetic feet. Gait & Posture, 35(1), 121-125.
Portnoy, S., van Haare, J., Geers, R. P. J., Kristal, A., Siev-Ner, I., Seelen, H. A. M., . . . Gefen, A. (2010). Real-time subject-specific analyses of dynamic internal tissue loads in the residual limb of transtibial amputees. Medical Engineering & Physics, 32(4), 312-323.
Portnoy, S., Yizhar, Z., Shabshin, N., Itzchak, Y., Kristal, A., Dotan-Marom, Y., . . . Gefen, A. (2008). Internal mechanical conditions in the soft tissues of a residual limb of a trans-tibial amputee. JOURNAL OF BIOMECHANICS, 41(9), 1897-1909.
Sara Kallin, 3 Okt 2019
TACK!Sara [email protected] 12 74Hälsohögskolan & Tekniska högskolanJönköping University
Tekn. Licentiat avhandling: Deformation of human soft tissues – Experimental and numerical aspects, 2019 http://hj.diva-portal.org/smash/record.jsf?pid=diva2:1344790 , http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45653
Sara Kallin, 3 Okt 2019