Q2: Active Vacuum: Materials and Components Flashcards
1
Q
Compressive Resistance
Liner Properties
A
- change in thickness placed under load
- Low compressive stiffness: compresses more, and will distribute peak pressures
- High Compressive Stiffness: compresses less, less likely offload peak pressures
2
Q
Shear Resistance
A
- ability to move from forces in the parallel line
- Low shear stiffness: sensative skin, less intimate fit
- high shear stiffness: higher stress on skin, may lead to pistoning of liner
3
Q
Stretch Resistance
A
- ability for liner to increase its length when pulled in opposite direction
- low tensile stiffness: ability to stretch likely to piston when pulled
- high tensile stiffness: less likely to stretch and piston
4
Q
Adherence
A
- force required to move liner along the skin
- low frictional coefficient: requires less force to be moved along the skin, slipping more likely
- high frictional coefficient: requires more force to move along the skin, slipping less likely, can cause shear
5
Q
TPE One part material
A
- heat mold characteristics
- thins over areas of high pressure
- poor memory
- mid 20’s low 30s on shore oo scale
- easy to reflect
- requires more thickness to absorb given force
6
Q
TPE Marketing Materials
A
- ideal use with elevated vacuum
- broad range of comfortable knee flexion
- circumferencial stretch
7
Q
TPE Personal Experience
A
- packs out quickly
- does not protect bony anatomy as well as other material
- easy to don
- tackiness sometimes issue with patella
8
Q
Silicone Liners
A
- can not be heat molded
- mid 30;s to low 50s on shore 00 scale
- excellent memory
- requires less thickness than copolymer to absorb same forces
9
Q
Silicone Marketing Materials
A
- compatible with all high vacuum
- medical grade silicone
- silky surface allows liner to slide on itself
- easy to don
- no coatins that crack
10
Q
Silicone Personal Experience
A
- durable
- does not protect bony areas well
- doesnt stretch out quickly
- solidifies tissue
11
Q
Urethane Liners
A
- can not be heat molded
- mid 30s low 50s on shore 00
- good memory
- requires less thickness than copolymer to absorb same forces
12
Q
Urethane liners marketing
A
- unique floating characteristic
- non stick
- reduction of forces on the limb
- highest stiffness, low impact forces
13
Q
Urethane personal experience
A
- protects bony limbs
- less moisture buildup
- doesnt compress tissue as much
- some drag pushing into the socket
14
Q
Why TSWB
A
- reduces gapping and underuts that would otherwise allow the liner to follow into that void
15
Q
Mechanical Pumps: P2 and HD
A
- heavy duty
- provides shock rotation capabilities
- waterproof
- pulls up to 26 inHg
