Week 11 Upper Extremity Prostheses Flashcards
Terminal Device
hand functioning device
Suspension
how the prosthesis is attached to the body
Excursion
How much ROM is needed
What is the most common reason for UE ampuation?
trauma
What are the types of UE prosthesis?
- shoulder disarticulation
- transhumeral
- Transradial
4.Trans metacarpal
What are the types of UE suspensions
- Harness
- Pin-lock Liner
- Suction
- Anatomical/self suspending
What are the advantages/disadvantages to the Harness suspension?
Advantages: simple, easy to manage
durable, accomodate heavy duty application, easy don and doff
Disadvantage: can be uncomfortable, poor cosmesis
Which UE amputation level makes harness the only option?
shoulder disarticulation
What are the advantages/disadvantages to the Pin-lock Liner Suspension?
Advantages: comfortable, cushion bony prominences, reduce shear forces
Disadvantage: somewhat difficult to don doff
*harness usually still needed-for power generation
Pin lock liner is ideal for what type of prosthesis?
passive
mid to short length TH or TR
may not be able to carry things
What are the advantages/disadvantages to Suction Suspension?
Advantages: interface with myoelectric control
Reduce or eliminate harness
Disadvantage: difficult to don doff
Very sensitive to volume fluctuations of UE
Suction Suspension utilizes what type of power control?
Myoelectric
What are the advantages/disadvantages to anatomical suspension/self suspending
Advantages: integrates with myoelectric control
reduces or eliminates harnessing
Disadvantages: difficult to don doff
Reduces range of motion
What is the other type of suspension system most common to see in addition to the pin-lock liner?
harness
The individual generates the force necessary to cause movement
Body powered prosthesis
What is force and excursion in relation to a prosthesis?
force- strength of causing motion strength pulling cable
excursion- how wide the terminal device opens from the force
What movement generate force and excursion for a shoulder disarticulation?
- biscapular abduction
- scapular elevation
- Chest expansion
What movements generate force excursion for a transhumeral/elbow disarticulation?
- GH flexion- ipsilateral
- biscapular abduction
- scapular depression/extension/abduction- ipsilateral
What movements generate force excursion for a transradial?
- GH flexion- ispilateral
- biscapular abduction
What is a Passive prosthesis best known for?
Primarily cosmetic
but it does function with a locking elbow could have rotating wrist, passive spring terminal device
An on-board motor provides force for motion- user selected to function independently as determined by control strategy
externally powered prosthesis
What two basic motions open a terminal device for a body powered transradial ampuation?
GH flexion- ipsilateral
Scapular abduction- bilateral
Cable control can be utilized with two power generations what are those?
- body power- harness capture excursion
- External power- connects to transducer or switch
Electrodes imbedded in the socket wall for contact with skin– collect electrical activity of a muscle contraction and convert it to a signal
myoelectric control
What system utilizes myoelectric control?
suction
What is hybird control?
combination of cable control and myoelectric control
Which is the most common electrical control method for a motor powered UE prosthesis?
myoelectric
Can terminal devices be custom?
yes there are many options to fit the needs of the patient
Explain Voluntary open TDs
force (of body) and excursion open hand spring or rubber band close hand
grasp depends on strength of band
Explain voluntary close TDs
force and excursion close the hand
rubber band opens
mimics the way a hand works you activate muscles to grip objects
however less common
The primary difference between voluntary open and voluntary close are you have to protract the shoulder to close the device
false
both use the same power generation just one opens with force and one closes with force depending on terminal device
