Tetsuya Nemoto

Wound fixation for pressure ulcers: a new therapeutic concept based on the physical properties of wounds.

A pressure ulcer is defined as damage to skin and other tissues over a bony prominence caused by excess pressure. Deep pressure ulcers that develop over specific bony prominences often exhibit wound deformity, defined as a change in the 3-dimensional shape of the wound. Subsequently, the wound deformity can result in undermining formation, which is a characteristic of deep pressure ulcers. However, to date, a concept with respect to alleviating wound deformity has yet to be defined and described. To clarify the issue, we propose a new concept called wound fixation based on the physical properties of deep pressure ulcers with wound deformity. Wound fixation is defined here as the alleviation of wound deformity by exogenous materials. The wound fixation methods are classified as traction, anchor, and insertion based on the relation between the wound and action point by the exogenous materials. A retrospective survey of a case series showed that wound fixation was preferentially used for deep pressure ulcers at specific locations such as the sacrum, coccyx, and greater trochanter. Moreover, the methods of wound fixation were dependent on the pressure ulcer location. In conclusion, our new concept of wound fixation will be useful for the practical treatment and care of pressure ulcers. Further discussion and validation by other experts will be required to establish this concept.

Viscoelastic Properties of the Human Dermis and Other Connective Tissues and Its Relevance to Tissue Aging and Aging–Related Disease

© 2012 Nemoto et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Viscoelastic Properties of the Human Dermis and Other Connective Tissues and Its Relevance to Tissue Aging and Aging–Related Disease

Evaluation of dermal segment on viscoelasticity measurement of skin by rheometer

The engineering of human tissue represents a major technique in clinical medicine. Material evaluation of skin is important as preventive medicine. Decubitus originates in pressure and the rub. However, shearing in the skin has exerted the influences on the sore pressures most. This paper examines one demand of crucial importance, namely the real time in vivo monitoring of the shearing characteristics skin tissue. Rheometer is a technology developed to measure viscoelasticity of solid and liquid. To measure viscoelasticity of the skin in the noninvasive with this device, we remodeled it. It is ideal for the continuous monitoring of tissues in vivo.

Evaluation in Skin by Hierarchical Separation Viscoelasticity Measurement by Rheometer

The engineering of human tissue represents a major technique in clinical medicine [1]. Material evaluation of skin is important as preventive medicine. Decubitus originates in pressure and the rub [2, 3, 4]. However, shearing in the skin has exerted the influences on the sore pressures most [5]. This paper examines one demand of crucial importance, namely the real time in vivo monitoring of the shearing characteristics skin tissue. Rheometer is a technology developed to measure viscoelasticity of solid and liquid. To measure viscoelasticity of the skin in the noninvasive with this device, we remodeled it. It is ideal for the continuous monitoring of tissues in vivo.

Influences of Isotropic and Anisotropic Material Properties on Stress Intensity Factors of the Crack Tip under Biaxial Stress

In order to clarify the effect of anisotropy on local deformation and the stress intensity factors in the vicinity of the crack tip under complicated stress states, biaxial loading tests were carried out on isotropic (Photoelastic sheet: PSM-1, Measurements Group, Inc) and anisotropic (LEXAN 9030, General Electric Company) polycarbonate materials. The biaxial dynamic loading device, which was developed by the authors, was fully utilized in the experiments. We carried out the experiments using isotropic and anisotropic specimens with a pre-processed 0°, 15°, 30°, 45°, 60°, 75° or 90° crack angle. We applied the equal biaxial stress, that is, the loads for both the Y- and X-axis as 0N : 0N-3920N : 3920N (1 : 1). We determined the stress intensity factors of specimens using both photoelasticity and caustics method. The results of the experiments were compared. As a result, when the materials with anisotropic property are used as machine or structural members, it is important to consider the extrusion direction of the material in their design.