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Upper Extremity Prosthetics > Module Questions > Flashcards

Module Questions Flashcards

1
Q

True or False: A myoelectric prosthesis functions when a patient generates a voluntary muscle contraction
to create an EMG that can be read by an electrode.

A

True

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2
Q

True or False: EMG travels in the direction of the muscle fibers. However, it is NOT necessary for the
contact points of the electrode to be aligned in the direction of the fibers to achieve an
optimal signal.

A

False

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3
Q

An electrode performs 3 functions to an EMG signal. Use your mouse to drag and drop
those 3 functions below in the sequence in which the electrode performs them.

A

Amplifes, Rectifies and filters

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4
Q

What physiological activity or signal is measured or detected by the electrode?

A

Action Potential

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5
Q

Which one of the statements below is correct?

A

All Ottobock electrodes have 3 main components: 2
differential inputs (one at each end) and a center reference
input or ground

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6
Q

How much signal is required to operate a Digital Hand at full speed?

A

a “High” level signal, Any signal just over the “on”

threshold & 0.54V

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7
Q

How much signal is required to operate a DMC hand at full speed?

A

a “High” level signal, The maximal signal the system can

read & 1.5V

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8
Q

True or False: An amputee controls grip force in a digital hand by maintaining a signal above the “on”
threshold until the desired grip force is achieved.

A

True

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9
Q

True or False: An amputee controls grip force in a DMC hand by adjusting the intensity of the contraction
to create the amount of grip force desired

A

True

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10
Q

From list below, identify two patient benefits a DMC system provides.

A

Improved predictability & Finer control possibilities

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11
Q

Identify the best location on a muscle to start looking for a signal?

A

Center of muscle belly

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12
Q

Match the sources of noise during myo-testing with its remedy for removal.

A
  1. Oily Skin = Clean w/ alcohol; dampen w/ water; 2. Skin
    too wet = dry the skin; 3. Skin too dry = dampen skin w/
    water; 4. Scars and/or skin grafts = avoid if possible; 5.
    Electro-magnetic interference = remove source, use
    grounding bar
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13
Q

What does the “First Signal Wins” principle in myo-testing mean?

A

Whenever two signals are generated simultaneously, the
first signal to cross the “on” threshold is the “winner”;
Only the “winning” signal is allowed to operate the
system; All other signals are ignored

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14
Q

True or False: The goal of myo-testing is to find the strongest signal available then, amplify it as
necessary to get the signal as close to the “high” classification as possible.

A

True

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15
Q

True or False: It is safe to charge a Lithium Ion battery when it’s not completely charged.

A

True

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16
Q

True or False: It is safe to charge a NiMH battery when it’s not completely charged

A

False

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17
Q

Which state or capacity is displayed here for the battery in this image?

A

Battery Fully Charged

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18
Q

True or False: Each time the Myo-Select tool is used to adjust the hand, it is reset to the NiMH
technology.

A

True

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19
Q

Identify the appropriate scenarios form the list below in which you could use a switch?

A

When you need to use switches to introduce additional
inputs for higher levels of amputation; Immediately postoperatively
w/ an externally powered prosthesis by
combining the switch with a harness; When the patient has
no detectable EMG signal; When a patient is transferred
form a body-powered to an externally powered system

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20
Q

When would you use a linear transducer?

A

Linear transducers replace a single electrode; When you
need to allow for proportional control; When you need to
combine a linear transducer with an electrode when only
one electrode site can be found

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21
Q

Which linear transducer is more robust and more resistant to damage?

A

9 x 52

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22
Q

Which linear transducer is more suitable for retro-fitting?

A

9 x 50

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23
Q

True or False: The MyoSelect can be used to program all Ottobock programmable components.

A

False

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24
Q

True or False: After making all programming changes using the MyoSelect, you know that all changes are
set when you hear an audible beep after holding the jog dial in.

A

True

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25
Q

What functions are performed by the MyoSelect?

A

It automatically returns components to NiCd and NiMH
battery mode; Choose a program option from available
program options for a component; Adjust settings
(maximum speed, thresholds)

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26
Q

To ensure that the changes you make using the MyoSelect are input into the component,
identify the correct sequence of steps required to remove and reinstall the component.

A
  1. Before removing a component from a prosthesis for
    programming with the MyoSelect, remove the battery
    from the battery box. Attach the component to the
    MyoSelect; 2. Push inward on the jog dial briefly then,
    release it to turn the MyoSelect on. After the MyoSelect is
    on, push the jog dial up or down to make changes to the
    component settings; 3. After all changes are made, hold
    the jog dial in until you hear a beep. Re-attach the
    component to the prosthesis. Re-insert the battery.
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27
Q

True or False: Due to their ability to monitor and optimize power management, microprocessors are able
to increase the operating time of a prosthetic system.

A

true

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28
Q

True or False: Closed loop control of all components is made possible by microprocessors which enable
improved efficiency and support more smooth and natural movements with the prosthesis.

A

True

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29
Q

True or False: Microprocessor control is unable to over-ride electromagnetic interferences in the
environment.

A

False

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30
Q

True or False: The DMC plus feature of the SensorHand Speed is a built-in safety feature that prevents
the prosthetic hand form inadvertently opening and losing grasp of an object.

A

True

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31
Q

What type of control is available in the SensorHand Speed?

A

Proportional control and digital control

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32
Q

How does the clinician decide which SensorHand speed program should be used to achieve
maximum benefit and performance for the patient?

A

The clinician need to combine knowledge of the patient’s
EMG signals with the type of input device they intend to
use before determining which program to use

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33
Q

For the SensorHand Program Numbers in the left column, select the corresponding number
of inputs required form the right-hand column

A

Programs #1, 2, 5 & 6 = 2 inputs; Programs #3 & 4 = 1

input

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34
Q

True or False: The device used to control the SensorHand Speed’s 6 programming options is the
MyoSelect.

A

True

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35
Q

SensorHand Speed has the following unique features.

A

AutoGrasp, Ability to activate and de-activate the thumb

& Flexi-Grip

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36
Q

How can you tell by looking at the hand whether or not you are holding a SensorHand
Speed?

A

The coaxial ring is always orange

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37
Q

True or False: All programs in the Greifer and MyoHand Variplus Speed offer proportional control for
both speed and grip force.

A

False

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38
Q

You are using program 4 in the SensorHand Speed. Which program should you choose for
the Greifer?

A

Program 4

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39
Q

True or False: You can adjust the speed of the Greifer.

A

False

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40
Q

True or False: You can adjust the speed of the MyoHand VariPlus Speed.

A

true

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41
Q

Which switching method offers immediate control of either the wrist or hand?

A

Program #1 (4 Channel Control)

42
Q

Which kind of control does the MyoRotronic offer for wrist rotation?

A

Both proportional and digital

43
Q

True or False: It is possible to control hand open/close and supination/pronation with only one electrode.

A

True

44
Q

True or False: The Automatic Switchback timer causes function to switch from the rotator to the terminal
device. The timer only works from hand to rotator, not rotator to hand.

A

False

45
Q

Identify a fitting challenge that could best be addressed by the Transcarpal hand.

A

The patient presents w/ a short limb

46
Q

Under what conditions would you use a 13E180 switch block?

A

Used for all wired hands

47
Q

What control options are available for the Transcarpal hand or a size 7 hand?

A

DMC & Digital

48
Q

How many versions of pediatric limb systems are available from Ottobock?

A

Two

49
Q

Which children’s system uses the MyoEnergy Integral Lilon battery system?

A

7.4 V children’s system

50
Q

Identify the improvements the 7.4V Children’s system has over the 4.8V Children’s system.

A

Can be adjusted using software and Bluetooth connection to optimize the system;
The 7in1 Controller system has up-to-date electronic components which reduces the size of the unit;
Allows for battery installation within the prosthesis to reduce bulk and improve cosmesis

51
Q

Which electrode should be used in a child’s hand system?

A

13E202 suction electrode = when the patient presents
enough residual limb volume, length, and circumference;
13E200 standard electrode = when the patient presents
very small limbs, small radii, or insufficient space

52
Q

True or False: The MyoSelect can be used to change the programs in the ErgoArm 12K50

A

True

53
Q

True or False: Of the 7 programs available for use with the ErgoArm, programs 1 (uses an external switch
to lock and unlock the elbow) and 2 (uses co-contraction of the patient’s EMG signals to
lock and unlock the elbow) are the most commonly used programs

A

True

54
Q

True or False: The Adjustable Forearm Balance (AFB) should be adjusted by the prosthetist only.

A

False

55
Q

True or False: The automatic forearm balance (AFB) is a complex mechanism that allows for varied
flexion assistance and resistance throughout the range of elbow joint motion.

A

True

56
Q 
True or False: The ErgoArm comes in four different versions and all share the same mechanical locking
function including the slip stop feature.
A

True

57
Q

True or False: Proportional control of the elbow, wrist and terminal device is possible with the
DynamicArm.

A

True

58
Q

True or False: The “ElbowSoft” software program is the only means of programming the DynamicArm.

A

True

59
Q

What is the maximum live lift capacity of the DynamicArm?

A

13.2 lbs.

60
Q

True or False: Simultaneous control of the elbow and either the hand or rotator is possible through
programming the DynamicArm.

A

True

61
Q

True or False: To lock or unlock the DynamicArm’s elbow joint, a separate signal is needed.

A

False

62
Q

What is the maximum live lift with a forearm length of 235mm?

A

6.0 Kg

63
Q

What is the movement range of the Dynamic Arm?

A

15˚-145ͦ˚

64
Q

When does the DynamicArm need to be switched off?

A

When exchanging the terminal device; when donning and
doffing the DynamicArm; when not in use; when
dismounting the DynamicArm from the socket

65
Q

What is the function of the Axon-Bus?

A

Axon-Bus transmits data between the elbow lock and the
electro lifter; Axon-Bus is a bi-directional data exchange;
Provides immediate input to all components

66
Q

What happens if the locked Dynamic Arm measures a positive load greater than 6 Kg or a
negative load greater than 1 Kg and a control signal to flex/extend the elbow is sent?

A

The elbow will not unlock; a warning beep and vibration

will be emitted

67
Q

True or False: Mechanical locking and unlocking is only engaged when the DynamicArm is turned OFF,
or when the power down sequence has started.

A

True

68
Q

True or False: Locking of the elbow is carried out automatically after elbow movement and unlocking is
carried out automatically before elbow movement.

A

True

69
Q

What steps should you follow in adjusting the Automatic Forearm Balance (AFB)?

A

Flex the elbow fully then turn the finger wheel in a
clockwise direction; the AFB is adjusted correctly when
the elbow can be held at 90˚

70
Q

What are the characteristics of the Linear Transducer?

A

Linear increase to maximum signal; allows proportional

control

71
Q

True or False:The linear transducer can be used to directly control the movement of the DynamicArm in
combination with another input device(s) to control the movement of the terminal device,
thus allowing simultaneous control of the elbow and terminal device.

A

True

72
Q

True or False: All input devices for the DynamicArm will be plugged into one of the ports on the easy
plug connection and are opposite for right versus left.

A

False

73
Q

What are the characteristics of the harness, cable, rocker and pressure switches?

A

Provide digital control of the component; produce
maximum signal when activated; most often used for
sequential switching

74
Q

True or False: All components and tools needed to assemble the DynamicArm are included in the
package, including the terminal device and the electric wrist rotator.

A

False

75
Q

True or False: When aligning the Dynamic Arm to the check socket with the alignment tool, the elbow
turntable must be horizontal to the floor to ensure proper elbow function.

A

True

76
Q

What is the correct wiring of the connection cable wires in combination with the coaxial
plug?

A

Do not connect the 2-pin cable wire to the coaxial plug

77
Q

What is the correct wiring of the connection cable wires in combination with the electric
wrist rotator?

A

Connect the 2-pin cable wire to the wrist rotator; connect
the transmitter cable, marked with a black/blue dot to the
receiver plug of the wrist rotator

78
Q

True or False: The calibration procedure determines the maximum flexion angle the elbow actively
moves to.

A

true

79
Q

What is the correct procedure for calibrating the DynamicArm?

A

Manually flex forearm once just short of the flexion stop
and manually extend forearm until reaching the extension
stop; After manually extending the forearm to the
extension stop, click the “End Calibration” button

80
Q

How do you activate “training mode” for the DynamicArm?

A

Switch over to training mode is done by unchecking the

box beside “Active mode”

81
Q

What is the default electrode allocation of the red extensor signal = Channel 2?

A

Extension in the elbow, Supination in the rotator, and

Opening in the hand

82
Q

True or False: By default the DynamicArm is delivered with the maximum speed set at 31%

A

True

83
Q

What type of feedback signals can be assigned to each prosthetic component?

A

You may choose one, two or three vibrations for each
component; You may choose one, two, or three beeps for
each component; You may choose no feedback

84
Q

True or False: After loading the control and switching parameters of one of the 9 Standard programs into
the Dynamic Arm, you still have the opportunity to further customize the program.

A

True

85
Q

True or False: One determination in selecting a standard program is the choice between sequential or
simultaneous control.

A

True

86
Q

What are some key factors to remember when making boost adjustments?

A

Always adjust the gain on the electrode to almost
maximum, 6.5, before adjusting the boost; You are able to
amplify the signal in increments of .25 up to an
amplification of 400% or a factor of 4; Boost applied in
the “Elbow” Column is a system wide boost

87
Q

What steps do you take to the program the Dynamic Arm for simultaneous control?

A

Choose 1-POS for the control mode in the Elbow column;

Check the box beside the word “Simultaneous”

88
Q

How will the wrist rotator be controlled if we choose 1-ELE in the Customizing tab?

A

Pronation and supination are controlled with 1 electrode;
A quick strong signal supinates, a slow mild signal
pronates; The upper threshold the signal needs to reach is
adjustable

89
Q

True or False: To select the control program for the terminal device, click on the number in the “Hand”
column.

A

True

90
Q

True or False; A long co-contraction is recognized when both signals remains above the ON threshold
and exceeds the value set on the timer.

A

False

91
Q

True or False: 4 Channel control uses Electrode 1 to control pronation and closing and Electrode 2 to
control supination and opening.

A

True

92
Q

What are the features of the step transducer?

A

Each component can be assigned to one of the engaging
positions of the step transducer; A timer is used to
designate when switching will occur

93
Q

How does the automatic switch back with automatic timer function?

A

The automatic timer is activated after movement has
stopped; The automatic timer only functions in a proximal
to distal direction; The automatic timer is not activated
when the elbow is in free swing; A timer is used to
designate when automatic switch back will occur

94
Q

What are the recommended steps to charge the Dynamic Arm?

A

Extend the Dynamic Arm, switch if OFF and lock the
elbow; Connect charging plug to charging port of the
Dynamic Arm, then connect power cable to power outlet

95
Q

True or False: The LED on the charger lights up Orange to indicate the battery is charging and lights up
Green when the battery is fully charged.

A

True

96
Q

True or False: When the charger is connected to the Dynamic Arm the elbow will not move and will be
locked, but the terminal device and rotator remain active.

A

False

97
Q

True or False: The battery management system monitors battery capacity and initiates a power down
sequence, beginning with the Dynamic Arm.

A

True

98
Q

True or False: If you hear either the critical error or recoverable error sound you will switch the Dynamic
Arm OFF/ON or connect the battery charger to the DynamicArm while it is turned ON

A

True

99
Q

True or False: An acoustic sound will be heard when the user is attempting to live lift beyond the
maximum capacity or when “negative load” is detected via the force sensor.

A

True

100
Q

True or False: You will hear an acoustic signal when the DynamicArm is turned ON and turned OFF

A

False

101
Q

True or False: If you turn the DynamicArm ON after the charging plug is engaged in the charging port,
you will hear an acoustic signal.

A

True

Upper Extremity Prosthetics (14 decks)

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