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22 Cards in this Set
- Front
- Back
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What are the classifications of medical device failure?
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1. mechanical failure
2. physio-chemical failure 3. chemical failure 4. device design |
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List the mechanisms of mechanical failure.
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creep
abrasion stress-cracking fatigue tensile failure |
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Define creep.
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long term deformation under load
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Define abrasion.
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surface failure during working
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What two issues might perpetuate mechanical failure?
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material choice and testing
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Define physio-chemical failure.
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dissolution of device/component in bio-fluids
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List three examples of physio-chemical failure.
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fouling
plasticization, crazing leaching of plasticizer, filler in bioenvironment |
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Define fouling.
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protein/cell absorption
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Define plasticization/crazing.
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property decay through water/lipid interactions
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List four examples of chemical failure.
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materials degradation of device
corrosion calcification catastrophic fibrous encapsulation |
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Define corrosion.
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oxidation or reduction of basic chemistry
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Define calcification.
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growing unwanted bone
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List 6 examples of failure resulting from device design.
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poor fabrication
sterilization contamination damage due to handling poor surgical procedure unexpected patient reaction to procedure/device |
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Define contamination.
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catastrophic infection through improper packaging
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Define poor fabrication.
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off-spec operation
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List potential cardiovascular effects (3) that could result from device failure that effect the material.
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protein absorption
cell adhesion plasticization/degradation |
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List potential cardiovascular effects (4) that could result from device failure that effect the patient.
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thrombi formation/embolism
cell injury tissue damage hyperplasia |
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What does SIMS stand for?
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secondary-ion mass spectroscopy
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What does XPS stand for?
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x-ray photoelectron spectroscopy
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XPS is commonly used to investigate what?
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chemical composition for structures
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SIMS is commonly used for what?
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solid surfaces and thin films
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What is one of the main advantages of SIMS?
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can detect elements in the parts per billion range
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