Stability & Elasticity

Before determination of the required minimum stability and maximum elasticity of mesh implants for abdominal wall reinforcement the values of the human abdominal wall itself have to be determined. This was done with both natural explants and calculational models of the human abdomen.

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Explants:

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Calculational Model:

Thin-wall hollow cylinder with a realistic body inside pressure of max. 20 kPa and an average abdominal circumference of 100 cm.:

Fi = 2 * r * L * p Fw = 2 * D * L * s Fi = Fw s = r * p / D Fmin = s * 2 * Pi *r *D / (2 * Pi * r) Fi = Inner force Fw = Force of wall s = Tension r = Radius p = Pressure D = Thickness of wall L = Length of cylinder

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Values:

Minimum required stability = 32 N/cm
Maximum allowed elasticity = 38% at break

(Source: University Clinic Aachen)

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Mesh-Test:

With a punch test the stability and elasticity of the mesh are determined.

Diameter of punch d = 100 mm Diameter of specimen D = 112,8 mm Area of specimen 100 cm² Measurement 1: Force F in Newton N, respectively N/cm Measurement 2: Way of die in mm, respectively in %

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Exemplary results:

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