Graft orientation influences meshing ratio

Čapek, Lukáš; Flynn, Cormac; Molitor, Martin; Chong, Simon; Henyš, Petr

doi:10.1016/j.burns.2018.05.001

Cited by 25 publications

(28 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To quantify the auxetic behavior and calculate the Poisson's ratios achieved by the skin graft models, the left edge was fixed in longitudinal loading direction and the right edge was stretched as shown in Figure 3. This was in line with the mechanical testing experiments (i.e., with UTM), 42 similar computational studies with skin grafts, 43,44 and partly the clinical practice of first stapling or suturing the graft from one side and then stretching in the longitudinal direction to achieve the required coverage by expansion. 45 Stretch of up to 50%, 100%, and 200% were applied and the induced lateral and total deformation, and equivalent stresses were estimated.…”

Section: Boundary Conditions For Uniaxial Testingsupporting

confidence: 78%

“…hence, exhibiting an anisotropic and non‐linear material property. Recent study by Capek et al 44 studied the significance of orientation of the Langer's lines using finite element method (FEM) and up to 25% differences in the expansions were quantified by comparing the deformations in perpendicular and parallel orientations of the graft. The skin graft area was also assumed to be square shaped and with a constant thickness for maintaining consistency in our analyses.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Biomechanical modeling of novel high expansion auxetic skin grafts

Gupta¹,

Gupta²,

Chanda

2022

Numer Methods Biomed Eng

View full text Add to dashboard Cite

Over 20 million burn injuries are reported every year, with severe cases requiring skin grafting. Traditionally, split thickness skin grafts are prepared by excising a small portion of healthy skin and its incision patterning using a suitable meshing device, which allows the graft to be expanded beyond its capacity. To date, the maximum expansion achieved through skin grafting has been reported to be less than three times, which is not sufficient for covering large burn sites with limited donor site skin. In this work, we have attempted to study skin graft expansion potential with novel auxetic patterns, which are known to exhibit negative Poisson's effect. Two‐layer skin graft models were developed using eight different auxetic incision patterns, and subjected to uniaxial and biaxial tensile strains. The Poisson's ratio, meshing ratio, and induced stresses were characterized for all graft models. The numerical results indicated expansion potentials greater than that of traditional skin grafts across all loads. Extremely high expansions (i.e., >30 times) were estimated for the I‐Shaped Re‐entrant and Rotating Triangles shaped auxetic models without rupture. Such pioneering findings are anticipated to initiate ground‐breaking advances towards skin graft research and improved outcomes in burn surgeries.

show abstract

Section: Boundary Conditions For Uniaxial Testingsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Biomechanical modeling of novel high expansion auxetic skin grafts

Gupta¹,

Gupta²,

Chanda

2022

Numer Methods Biomed Eng

View full text Add to dashboard Cite

show abstract

“…It should also be mentioned that in our study, direction of impulse of L‐shape probes was across (in volar forearm and shin area) and diagonal (in clavicular area) to Langer's line. Karl Langer was a pioneer of research on skin biomechanical properties 50‐53 who described location and direction (determined by intradermal bundles of collagen and elastin fibres) of decreased tension lines in skin, which should be considered as an important factor affecting the results of Myoton PRO measurements.…”

Section: Discussionmentioning

confidence: 99%

Comparison of different MyotonPRO probes for skin stiffness evaluation in young women

Rosicka¹,

Mierzejewska-Krzyzowska²,

Mrówczyński³

2020

Skin Research and Technology

View full text Add to dashboard Cite

Background Stiffness of skin is widely used parameter in many research areas, for example cosmetic industry, dermatology or rheumatology for assessing of skin condition as well as changes occurring in skin. In this pioneering study, we conducted measurements of skin stiffness using MyotonPRO —novel tool, which was mainly used to evaluate biomechanical properties of muscles, ligaments and tendons. We expected that MyotonPRO , which shows great reproducibility in previous studies, will also be able to measure skin stiffness. Materials and methods Four replaceable probes designed by MyotonPRO (L‐shape short and medium arm, standard cylindrical flat‐end probe and the same standard probe with disc attachment ) were tested for measurement of skin stiffness in young women (30 healthy females) at three different locations (clavicula, volar forearm and shin). Results There was no significant difference between stiffness values obtained with L‐shape short and L‐shape medium arm probes in all investigated areas. Stiffness values recorded by regular probe and regular probe with disc attachment differ significantly from those collected with L‐shape probes. There was also significant difference between values of stiffness obtained by standard with disc attachment and standard probes. Conclusion Both L‐shape probes show a great reliability for skin stiffness assessment. Therefore, MyotonPRO can be considered a reliable device for assessing skin stiffness.

show abstract

“…As a general rule, with increasing expansion ratios, the expansion achievable in practice tends to be smaller than the advertised one. 5,8,9 Moreover, when a skin graft is subjected to a large extension it tends to contract laterally due to Poisson's effect, which makes the graft application more challenging. This side effect is fundamentally due to the underlying design of the graft meshing pattern that solely enhances the graft's expandability in just one direction.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, achieving very large expansion ratios (eg, of up to 1 : 9) based on existing technology is difficult. As a general rule, with increasing expansion ratios, the expansion achievable in practice tends to be smaller than the advertised one 5,8,9 . Moreover, when a skin graft is subjected to a large extension it tends to contract laterally due to Poisson's effect, which makes the graft application more challenging.…”

Section: Introductionmentioning

confidence: 99%

Optimal structural pattern for maximal compliance using topology optimization based on phasefields: Application to improve skin graft meshing efficiency

Sutula

Henyš

Čapek

2020

Numer Methods Biomed Eng

Self Cite

View full text Add to dashboard Cite

This article focuses on the problem of maximal compliance design of a hyperelastic solid with the optimal design of human skin grafts as the application in mind. The solution method is a phasefield-based topology optimization method that supposes multiple local phasefields and a minimum distance constraint in order to prevent the phasefields from merging. Consequently, structurally disintegrating solutions such as by the coalescence of voids can be prevented. The method is used to find an optimal graft meshing pattern for a sample that is subjected to a biaxial extension of up to 150%, which corresponds to an expansion ratio of 1 : 2.25. Three prospective unitcell solutions that exhibit meta-material behavior are proposed for a periodic graft pattern. The results are a step toward improving the skin graft meshing efficiency. This work does not cover experimental validation.

show abstract

Graft orientation influences meshing ratio

Cited by 25 publications

References 20 publications

Biomechanical modeling of novel high expansion auxetic skin grafts

Biomechanical modeling of novel high expansion auxetic skin grafts

Comparison of different MyotonPRO probes for skin stiffness evaluation in young women

Optimal structural pattern for maximal compliance using topology optimization based on phasefields: Application to improve skin graft meshing efficiency

Contact Info

Product

Resources

About