Tutorial 12 Video Questions Flashcards
What are FOUR main ways a material can interact with the human body?
1) It can hurt you
2) It can dissolve and be replaced by cells
3) Your body can surround it with a protective layer
4) It can bond with your living tissue
List the FOUR modern biomaterials highlighted in the video
1) Titanium
2) Stainless Steel
3) Polyurethane
4) Hydrogels
What is an example of application for titanium and stainless steel?
It can used everywhere from joint replacements to dental implants
What is an example of application for polyurethane?
It can be used in catheters, artificial heart valves
What is an example of application for hydrogels?
It can be used to make contact lenses
What is a biologically inert material, and give an example.
Titanium and some other alloys can be classified as biologically inert materials, which means they cause little or no reaction with nearby tissues. An example would be braces.
Why is titanium a superior biomaterial compared to stainless steel?
It is because titanium has a lower density compared to other metallic biomaterials, therefore a titanium implant will be lighter and comfortable than a similar one made from stainless steel.
What are the reasons of coating titanium with blood thinner?
It might prevent clots
What are the reasons of coating titanium with protein?
It might speed up the healing process
What are the reasons of coating titanium with silver?
It gives the alloy the ability to bond with the living tissues and discourage bacterial growth
What are some characteristics of polyurethane that makes it a useful biomaterial?
1) High level of elasticity, making it flexible
2) Durable, making it resistant to tearing
Combine both these properties, and you will end up with a biomaterial that performs well under both static and dynamic loads
What characteristics of hydrogels enable it to retain water?
Hydrogels are materials made up of things called hydrophilic structures
- These hydrophilic structures are cross-linked polymers, and are capable of holding large amount of waters.
Why is PHEMA suitable for making contact lens?
PHEME hydrogels are well suited to make contact lenses because it is tough and does not degrade easily.
Furthermore, it is not absorbed by the body, and can take on different shapes and forms.
What else can PHEMA be used for?
PHEMA can be used to deliver medicine to the eye
What are some other applications of hydrogels? (4)
1) Wound-healing adhesives
2) Artificial skin and cartilage
3) Sexual organ reconstruction
4) Vocal cord replacements
