TT prosthesis components Flashcards
components of a TT prosthesis
interface
suspension
3S/Pin suspension
vacuum suction/expulsion valve
vacuum suction/elevate suction
suspension aids
foot/ankle assembly
articulated foot - ankle assembly
interface
liner/suspension
what is an interface
anything b/w the RL and the socket
interface fxn
distribute pressure
pad bony prominences
decrease friction
decrease shear force
which function of the interface is most important
decrease shear force
what could the interface be
liner or insert or could be part of suspension (part that holds the prosthesis on)
insert is not part of the suspension, could be for pressure distribution
liners or inserts
pelite/foam
silicon, gel, urethane characteristics
pelite/foam (liners or inserts)
not for suspension
insert or liner
inexpensive
compressible
does not reduce shear
silicon, gel, urethane characteristics
shock absorption
best at shear reduction
best at pressure distribution
often part of suspension
which liner/insert is the best of them all
silicon
closest to normal tissue
how is suspension rated
ability to prevent pistoning
what is pistoning
the distance the socket moves away from the RL when NWB
types of suspension
supracondylar cuff
thigh corset
rubber sleeve
suction suspension
supracondylar cuff –> design (suspension)
strap
suspends over femoral condyles
supracondylar cuff –> advantages (suspension)
small
no pressure on thigh
supracondylar cuff –> disadvantages (suspension)
fair suspension
not for obese patient
supracondylar cuff –> uses today (suspension)
sometimes auxillary strap
thigh corset –> design (suspension)
suspends around the thigh
orthotic knee joints w/ leather corset
thigh corset –> advantages (suspension)
larger area for suspension
used when can’t use condyles
thigh corset –> disadvantages (suspension)
heavy & bulky
poor cosmesis
encourages thigh atrophy
thigh corset –> uses today (suspension)
TKR
rubber sleeve suspension
replaced the thigh corset for most cases
rubber sleeve suspension –> design (suspension)
neoprene or elastic
rubber sleeve suspension –> advantages (suspension)
larger suspension area
inexpensive
easy to replace
rubber sleeve suspension –> disadvantages (suspension)
rolls down/shape of thigh
bulky
fair suspension/pistoning
3S/pin suspension
uses a PTB socket
3S/pin suspension –> design (suspension)
silicon sleeve
pin
shuttle lock
silicon sleeve –>3S/pin suspension –> design (suspension)
adheres to the skin on RL
secures leg to RL
pin –> 3S/pin suspension –> design (suspension)
attached to silicone sleeve
goes into shuttle lock
secures the sleeve to the prothesis
3S/ pin suspension –> advantages (suspension)
minimal pistoning
no additional straps or buckles
easier for patients with hand pathologies
3S/ pin suspension –> disadvantages (suspension)
some movement b/w sleeve and socket
stretching of the sleeve
vacuum suction/expulsion valve
used w/ TSB socket
vacuum suction/expulsion valve –> design
negative pressure suction creates vacuum b/w the 2 sleeves
vacuum suction/expulsion valve –> 2 sleeves
outer and inner sleeve
outer sleeve –> vacuum suction/expulsion valve
connects to the prosthesis
inner sleeve –>vacuum suction/expulsion valve
connects to leg
vacuum w/ expulsion valve –> vacuum suction/expulsion valve
air pushed out
one way valve
vacuum suspension/ elevated suction
harmony design system
harmony triton
harmony design system –> vacuum suspension/ elevated suction
same as suction w/ expulsion, but expulsion valve except has pump to remove air
vacuum b/w the 2 sleeves
harmony triton –> vacuum suspension/ elevated suction
pump built into the shank of the foot
vacuum suspension/ elevated suction –> advantages
high mm of mercury vacuum –> greater than vacuum suction
excellent suspension
disadvantages –> vacuum suspension/ elevated suction
pump built into the shank of the foot
suspension aids
waist belt and fork strap
waist belt and fork strap
last resort for suspension
used w/ another suspension system
foot/ankle assembly –> fxn
BOS
motion
adaptation
propulsion
foot/ankle assembly –> normal range
3 planes of motion
10 degrees DF
25 degrees PF
sup/pronation
rotation
control –> foot/ankle assembly
greater the movement/greater control needed
articulated foot - ankle assembly
single axis
multi-axis
single axis –> articulated foot and ankle assembly
15 degrees PF
5 degrees DF
no ML movement
anterior/DF bumpers
posterior/PH bumpers
multi-axis –> articulated foot ankle assembly
A/P
M/L
transverse motion
decrease torsion stress on RL/socket interference
articulated dynamic single axis foot
elation
runway/freedom innovation
computer bionic
elation –> articulated dynamic single axis foot
active k3 level
adjustable ankle
carbon fiber
sacrifice dynamic response
what is the elation good for –> articulated dynamic single axis foot
transition from sneaker to high heels
runway/freedom innovation –> articulated dynamic single axis foot
active k3 level
adjustable from a flat heel for sandals or walking
button to adjust ankle angle
what is articulated dynamic single axis foot articulated w/
bumpers
computer bionic –> articulated dynamic single axis foot
k3-k4
ossur proprio foot
BIOM
occur proprio foot –> articulated dynamic single axis foot
heavy, expensive
many patients at k4 level will not use a computerized ankle
BIOM –> articulated dynamic single axis foot
motor driven
must charge 4x a day
expensive
what should we consider –> articulated dynamic single axis foot
weight
fxn
battery life
price
articulated dynamic multi-axis
college park true step
college park true step –> articulated dynamic multi-axis
k3-4
carbon fiber
bumpers
lots of moving parts
high dynamic response
non-articulated non-dynamic
SACH foot
SACH foot –> non-articulated non-dynamic
solid ankle cushioned heel
K1 foot
SACH foot build –> non-articulated non-dynamic
wooden keel (heart)
cushioned heel stimulates HS and FF
toe break area
toe break area –> SACH –> non-articulated non-dynamic
MT heads
PO area
jxn keel
cover
SACH foot –> advantages –> non-articulated non-dynamic
no moving parts
movement thru cover
inexpensive
ML motion
SACH foot –> disadvantages –> non-articulated non-dynamic
poor push off
poor gait
COG drop (energy costing)
ML motion
non - articulate dynamic
flex foot - axis flex walk
ossur ceterus
renegade freedom innovation
ottobock harmony triton’s
flex sprint (cheetah)
flex foot - axia/flexwalk –> non-articulated dynamic
K2 - K3
recommend for long residual limbs, low moderate activity level
lower profile
ossur ceterus is now called –> non-articulated dynamic
pro flex XC torsion
K3-K4
pro flex XC torsion –> non-articulated dynamic
carbon fiber
shock absorption
rotation device
sports (good for golfer)
renegade freedom innovation –> non-articulated dynamic
K3-K4
replace reflex VSP
freedom innovation
vertical shock deflection
more popular than VSP
ottobock harmony triton’s –> non-articulated dynamic
K3-K4
enhanced suction pump built in
3 carbon fiber springs
what is a ottobock harmony triton used w/ –> non-articulated dynamic
harmony suspension/elevated suction
negative pressure elevated suction suspension
where does the ottoback harmony triton absorb energy –> non-articulated dynamic
at HS
releases energy at PO
flex sprint is also called –> non-articulated dynamic
cheetah
cheetah –> non-articulated dynamic
carbon
no heel component
running foot
your pt wants a new foot for sprinting, which foot is most appropriate
cheetah
your pt tried a prosthetic foot that has an articulating ankle before and does not like them. however he likes the energy storing qualities of his previous foot. what foot would be the best choice for him?
flex foot
