1. The properties of surgical implant materials are given below. The materials a
ID: 84153 • Letter: 1
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1. The properties of surgical implant materials are given below. The materials are selected based on following limit values of criteria sted below. a) Can you identify alternative materials (different from what is specified in the table given under part c of this problem) for hip implants using criteria given below, especially mechanical properties? 1. Tissue tolerance, lower limit, Y-7. 2. Corrosion resistance, lower limit. 3. Tensile strength. lower limit, Y 95 MPa. 4. Fatigue strength. lower limit. Y :33.25 MPa. 5. Toughness, lower limit, r 2. 6. Wear resistance ower limit. Y 7. 7. Elastic modulus. target value, Y 4 GPa. 8. Specific gravity. target value. YL 2.1. 9 Relative total cost. upper limit. 10. b) Using the table of properties given below, decide the relative importance of each criteria utilizing AHP. Property Tissue tolerance (lower-limit property) Corrosion resistance (ower mit property) Tensile strength (lower mit property) Fatigue strength (lower limit property) Toughness (lower-limit property) Wear resistance (lower-limit property) Elastic modulus (target-value property) Specific gravity (target-value property) Cost upper-limit property) c) Using the table of material properties, AHP and weight factor of criteria from AHP process of part b, identify the best materials that can be used for hip implants. Corrosion Resistance: This is because body fluids are aqueous salt solutions with concentrations roughly comparable to seawater and with a pH value of 74. This environment is hostile and could cause corrosion of many metallic materials. Corrosion resistance is rated according to a scale of 10-1. Tissue Tolerance In general, biological requirements represent the major constraints in selecting implant materials. The action of the implant material on the body tissues can range from toxicity, in which case the implant material is totally rejected, to inertness. This requirement is usually called tissue tolerance and is difficult to quantify. For the sake of comparison, materials are given aratingof 10 for the best material and1 for the worst. Only materials with tissue tolerance of7or more will be considered.Explanation / Answer
Ans-(a) titanium implant is an alternative for best hip implant.
Ans-(b) tissue tolerance- epoxy have least value.
Epoxy and 312, 316 have least corrosion resistance.
Stainless steel have less tensile strength.
Unalloyed titanium have less fatigue strength .
Epoxy glass is least strong
Epoxy glass is least wear resistance.
Titanium is best for next three catogery.
Ans-(c) titanium is best metal used for hip implant. It is very much strong and elastic.ARMD, MOM and COM ate other option.
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