Flashcards in Terminal devices and wrist units Deck (16)
Main difference between myoelectric and microswitch-controlled externally powered terminal device
Myoelectric uses surface electrodes on muscles of residual limb to activate terminal device.
Microswitch uses a button or switch to activate terminal device.
What determines prehensile force of the voluntary opening terminal device?
Number and type of rubber bands/springs
Which body-powered terminal device is more physiologic
Voluntary closing terminal device
What additional feature to a wrist unit should be considered for a bilateral UE amputee?
A wrist flexion unit to help with ADLs
What is the advantage of a locking wrist unit?
Prevents accidental rotation of the wrist when carrying something
What is a combination wrist flexion unit
Combines locking and friction types of wrist units to allow locking in wrist flexion
Three types of terminal devices
3. Externally powered
What determines prehensile force of the voluntary closing terminal device?
Strength of the individual
2 main types of wrist units
1. Friction wrist unit
2. Locking wrist unit
Most common type of body-powered terminal device
Voluntary opening terminal device
What is the main disadvantage of a voluntary closing terminal device?
User has to maintain constant pull on harness for prolonged prehension
Is the rotation function of a wrist unit passive or active?
Passive - so it is rotated by the user's other hand or by pushing it against something
2 types of body powered terminal devices
Voluntary opening or voluntary closing
What is the purpose of a passive terminal device
Cosmetic purpose. No function
What is the purpose of a wrist unit?
Provides pronation and supination of the hand