Human soft tissues, mechanical properties

PVA hydrogels are non-bio degradable and relatively bio compatible and can be easily fabricated since they possess high stability under a range of temperature and pH conditions [43]. Their structural mechanical properties are similar to those of human soft tissues and provoke a limited inflammatory response [54]. 

Table 8.1 Mechanical properties of selected human soft tissues and tissue components.

Tissue Properties. The properties of human tissues when the body is considered a linear, passive mechanical system are summarized in Table 10.1 (von Gierke et al., 2002 Goldstein et al., 1993). The values shown for soft tissues are typical of muscle tissue, while those for bone depend on the structure of the specific bone. Cortical bone is the dominant constituent of the long bones (e.g., femiu, tibia), while trabecular bone, which is more elastic and energy absorbent, is the dominant constituent of the vertebrae. The shear viscosity and bulk elasticity of soft tissue are from a model for the response in vivo of a human thigh to the vibration of a small-diameter piston (von Gierke et al., 1952)... 

FIGURE 103 Mechanical resistance and reactance of soft thigh tissue (2 cm in diameter) in vivo from 10 Hz to I MHz. The measured values (open circles—resistance diamonds— reactance) are compared with the calculated resistance and reactance of a 2-cm-diameter sphere vibrating in a viscous, elastic compressible medium with properties similar to soft human tissue (continuous lines, curves A). The resistance is also shown for the sphere vibrating in a frictionless compressible fluid (acoustic compression wave, curve B) and an incompressible viscous fluid (curve Q. (von Gierke el at., 1952.)... 

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