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Flashcards in Electrotherapeutic Basics Deck (154)
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61

What are the possible waveforms or phase shapes (5)

1. Rectangular
2. Square
3. Triangular
4. Saw tooth
5. Sinusoidal

62

What are the amplitude dependent characteristics (4)

1. Peak amplitude
2. Peak to peak amplitude
3. Root mean square amplitude
4. Average amplitude

63

What is the peak amplitude

The maximum current reached for a single phase

64

What is the peak to peak amplitude

The maximum current measured from the peak of the first phase to the peak of the second phase

65

What is the root mean square amplitude

The most common mathematical method of defining the effective voltage or current of an AC wave

66

For a sine wave what is the RMS compared to the peak value and peak to peak value

Peak value: 0.707 times
Peak to peak value: 0.345 times

67

What is the average amplitude

The mean voltage under the sine wave curve

68

What are the time dependent characteristics (8)

1. Phase duration
2. Pulse duration
3. Rise time
4. Decay time
5. Interpulse interval
6. Intrapulse interval
7. Period
8. Frequency

69

What is the phase duration

Time from beginning of a phase to the end of a phase

70

What is the pulse duration

Time from beginning of a pulse to the end of a pulse

71

What is the rise time

Time required from the beginning of a phase to the peak of the phase

72

What is the decay time

Time from the peak of the phase to the end of the phase

73

What is the interpulse interval

Time from the end of one pulse to the beginning of the next pulse

74

What is the intrapulse interval

Time from the end of one phase to the beginning of the next phase

75

What is the period

The time to complete one pulse

76

What is the frequency

1/period

77

What are the characteristics of a series of pulses (3)

1. Interpulse interval
2. Frequency
3. Current modulation

78

What are the ways to modulate current (5)

1. Amplitude modulation
2. Pulse duration modulation
3. Frequency modulation
4. Ramp modulation
5. Timing modulation

79

What is ramp modulation

How much time it takes to get to the peak of the individual phase

80

What is timing modulation

Using bursts to modulate period of on time (ask Dr. Stachura about this)

81

What is a burst

A series of pulses flowing for a finite period of time followed by a period of no current flow

82

What is burst duration

The length of time from the beginning of the burst to the end expressed in milliseconds

83

What is the interburst interval

Time from the end of one burst to the beginning of the next burst

84

What is the burst frequency

The number of burst per unit of time

85

What are the 3 types of electrode systems

1. Carbon rubber
2. Carbon rubber with conducting gel
3. Vinyl covered metal plate

86

What are the electrode considerations for current density (2)

1. Depends upon size of electrodes
2. Depends upon electrode placemetn

87

Does a smaller electrode have a smaller or higher current density

Higher current density

88

Do electrodes placed close together have higher current density superficially or deeper in tissues

Superficially

89

Do electrodes placed farther apart have high current density superficially or deeper in tissues

Deeper in tissues

90

What are the 3 ways to place electrodes

1. Monopolar
2. Bipolar
3. Quadrapolar