Terminal devices and wrist units Flashcards Preview

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Flashcards in Terminal devices and wrist units Deck (16)
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1
Q

Main difference between myoelectric and microswitch-controlled externally powered terminal device

A

Myoelectric uses surface electrodes on muscles of residual limb to activate terminal device.
Microswitch uses a button or switch to activate terminal device.

2
Q

What determines prehensile force of the voluntary opening terminal device?

A

Number and type of rubber bands/springs

3
Q

Which body-powered terminal device is more physiologic

A

Voluntary closing terminal device

4
Q

What additional feature to a wrist unit should be considered for a bilateral UE amputee?

A

A wrist flexion unit to help with ADLs

5
Q

What is the advantage of a locking wrist unit?

A

Prevents accidental rotation of the wrist when carrying something

6
Q

What is a combination wrist flexion unit

A

Combines locking and friction types of wrist units to allow locking in wrist flexion

7
Q

Three types of terminal devices

A
  1. Passive
  2. Body-powered
  3. Externally powered
8
Q

What determines prehensile force of the voluntary closing terminal device?

A

Strength of the individual

9
Q

2 main types of wrist units

A
  1. Friction wrist unit

2. Locking wrist unit

10
Q

Most common type of body-powered terminal device

A

Voluntary opening terminal device

11
Q

What is the main disadvantage of a voluntary closing terminal device?

A

User has to maintain constant pull on harness for prolonged prehension

12
Q

Is the rotation function of a wrist unit passive or active?

A

Passive - so it is rotated by the user’s other hand or by pushing it against something

13
Q

2 types of body powered terminal devices

A

Voluntary opening or voluntary closing

14
Q

What is the purpose of a passive terminal device

A

Cosmetic purpose. No function

15
Q

What is the purpose of a wrist unit?

A

Provides pronation and supination of the hand

16
Q

What is the main difference between a voluntary opening and a voluntary closing terminal device

A

Voluntary opening = device maintained in closed position and user has to open it.
Voluntary closing = device maintained in open position and user has to close it.