10: Biomaterials - Smith Flashcards
1
Q
define biomaterials
A
those products that are brought into contact with body tissues
2
Q
4 reasons why biomaterials ***
A
- compatible
- facilitate surgery
- minimize complications
- improve results
3
Q
injectable silicone
A
- soft tissue replacement
- uses: heloma, tyloma, neurotrophic ulcers
(-) migration
4
Q
injectable collagen
A
- matrix for fibroblasts and vascular ingrowth
- uses: diabetic foot ulcers
(-) expensive, short acting
5
Q
silastic sheeting
A
- prevents scarring and adhesions
- uses: tendon repair (prevents scarring down to sheath)
6
Q
bovine collagen bioprosthesis
A
- tendon graft
- “hunter tendon graft” silicone
- xenograft
- uses: stabilization procedures and tendon repairs
7
Q
polyolefins
A
- polyethylene and polypropylene
- uses: STA-Pef/STJ arthroereisis
(-) creeping and damage
8
Q
hydroxyalpatite
A
- coral
- acts as a trellis for osseous ingrowth
- uses: bone grafts
9
Q
dacron and fortex mesh grafts
A
synthetic fiber used to prevent adhesions, surgical repair of ruptured tendons and ligaments, entubulation and vascular grafts
10
Q
acrylic polymers
A
- polymethylmethacrylate PMMA
- exothermic rxn
- used as bone cement for implants and PMMA beads
11
Q
silastic gel sheeting
A
- reduces or softens hypertrophic scars
- gel sheets placed on scar
- not to be used on open wounds
12
Q
name 6 hemostatic agents (things used to control bleeding)
A
topical thrombin absorbable gelatin sponge microfibrillar collagen oxygen-regenerated cellulose bone wax drains
13
Q
describe topical thrombin
A
- thrombostat
- bovine prtn which clots the fibrinogen of blood
- applied, not injected
- patient sensitivity
14
Q
absorbable gelatin sponge
A
- gelfoam
- purified animal prtn
- liquefies in 2-5 d, absorbed in 4-6 wks
- used for tx of ulcers
15
Q
microfibrillar collagen
A
- avitene
- adheres to blood soaked surfaces and attracts platelets
- does not interfere with bone healing, but causes an inflammatory response
- there is also an autologous platelet gel
