Mechanical Characterization of Porcine Solid Abdominal Organs

Tamura, Atsutaka; Omori, Kiyoshi; Miki, Kazuo; Lee, Jong B.; Yang, King H.; King, Albert I.

doi:10.1299/jsmetokai.2003.52.153

Cited by 3 publications

(5 citation statements)

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“…If the material is strain-time separable [1,6,7] , i.e., if its stress relaxation function can be expressed by the product of a function of time alone and a function of strain alone, the stress relaxation response can be normalized and described as a form of reduced relaxation function, i.e., G(t) is obtained by normalizing the relaxation curve by its peak force immediately after the step (ramp) loading as given by Eq. 1, and is approximated by a sum of exponential terms (Eq.…”

Section: Relaxation Testmentioning

confidence: 99%

“…1, the brain tissue was assumed to be a strain-time separable material in the range of strains and times tested here (Fig. 6b) [1,6,7] , i.e., the stress relaxation K(t,ε) could be expressed as the product of two mutually independent functions of time and strain as [6] :…”

Section: Relaxation Responsementioning

confidence: 99%

“…In the present study, the average reduced relaxation function was approximated by a Prony series (Eq. 5) with a commercial data With the application of the Quasi-Linear Viscoelastic (QLV) theory [1,6,7] , the stress at time t can be described by summing up contributions of all the past changes as given in Eq. 6.…”

Section: Relaxation Responsementioning

confidence: 99%

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Mechanical Characterization of Brain Tissue in High-Rate Extension

Tamura

Hayashi

Nagayama

et al. 2008

JBSE

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Mechanical properties of brain tissue characterized in high-rate loading regime are indispensable for the analysis of traumatic brain injury (TBI). However, data on such properties are very limited. In this study, we measured transient response of brain tissue subjected to high-rate extension. A series of uniaxial extension tests at strain rates ranging from 0.9 to 25 s -1 and stress relaxation tests following a step-like displacement to different strain levels (15-50%) were conducted in cylindrical specimens obtained from fresh porcine brains. A strong rate sensitivity was found in the brain tissue, i.e., initial elastic modulus was 4.2 ± 1.6, 7.7 ± 4.0, and 18.6 ± 3.6 kPa (mean ± SD) for a strain rate of 0.9, 4.3, and 25 s -1 , respectively.In addition, the relaxation function was successfully approximated to be strain-time separable, i.e., material response can be expressed as a product of time-dependent and strain-dependent components as: , and σ e (ε ) is the peak stress following a step input of ε. Results of the present study will improve biofidelity of computational models of a human head and provide useful information for the analysis of TBI under injurious environments with strain rates greater than 10 s -1 .

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Section: Relaxation Testmentioning

confidence: 99%

Section: Relaxation Responsementioning

confidence: 99%

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Mechanical Characterization of Brain Tissue in High-Rate Extension

Tamura

Hayashi

Nagayama

et al. 2008

JBSE

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“…a compressive ratio of at least approximately 50%. Some literatures have stated that the amount of deformation is a suitable parameter for determining the liver injury tolerance (5) (7) (8) . Sparks et al suggested the prediction of liver injuries by measuring the internal fluid pressure (9) .…”

Section: Indenter Profile Targeted Compressive Ratiomentioning

confidence: 99%

Compressive Characteristics of Porcine Whole Liver

Kaneta

Ohkawa

Suzuki

et al. 2009

JBSE

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The liver is one of the injury regions impacted by the steering wheel during a traffic accident. Therefore, in the field of impact biomechanics, the study of the liver has attracted considerable interest. We consider the case of abdominal compression by a steering wheel and perform quasi-static compression tests using a full-scale porcine liver that is not shaped into a cylinder or a cube in order to determine the basic mechanical properties of an unaltered liver. A human liver and a porcine liver have different structures; the former is divided into two regions (right and left lobe), while the latter is divided into four regions (right medial, right lateral, left medial, and left lateral lobe). Therefore, we compared the compressive properties of the four regions of the porcine liver using a cylindrical indenter to simulate the effect of the steering wheel of a passenger car. No significant differences were observed among the four porcine liver regions. Next, we compared the differences in mechanical properties, behaviors, and injury patterns of the porcine liver by using four compressive indenter profiles. The indenters were made from an acrylic resin. Although the injury patterns were different, yield loads were observed under an approximately constant compressive ratio regardless of the compressive indenter profile.

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“…Additionally, the abdominal organ tissues have been characterized in vitro with rectangular samples [12]. However, these studies have limited application to clinical applications and the results of these studies show a wide range of variability in the measured forces due to the selected organ, the methodology, and the inherent nonlinear biomechanical properties of soft biological tissues.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Surgical Tool Force Requirements

Berg

2016

Preprint

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Through the use of a cadaveric porcine model, forces necessary for manipulation of the abdominal organs were evaluated using an instrumented probe. Additionally, forces for tissue puncture, knot tightening, and suture breakage have been measured in order to determine the requirements placed upon the design of novel robotic surgical tools. The break forces for a variety of suture sizes and types were evaluated including sizes 3-0 through 7-0 polypropylene, size 1 polybutestor, size 4-0 chromic gut, and size 6-0 braided polyester. Tests of the tissue puncture force and knot tightening forces were carried out using the same instrumented probe, while the suture break forces were measured using a tension testing machine. The measured forces were found to compare well against the literature and provide a good basis from which to design robotic * Address all correspondence to this author. surgical tools with the appropriate capabilities.

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Mechanical Characterization of Porcine Solid Abdominal Organs

Cited by 3 publications

References 0 publications

Mechanical Characterization of Brain Tissue in High-Rate Extension

Mechanical Characterization of Brain Tissue in High-Rate Extension

Compressive Characteristics of Porcine Whole Liver

Experimental Analysis of Surgical Tool Force Requirements

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