General EStim Info

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General EStim Info
2011-02-24 23:14:04
Mod Test Two

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  1. Describe Output Amplifiers
    • regulation of constand current/voltage to patient regardless of changing imedances
    • Constant Current
    • Constant Voltage
  2. Define Direct Waveforms
    • unidirectional flow of charge particies
    • Negative is better
    • When the machine is on the curent in constant
  3. Define Alternating Direct Current
    • An uninterrupted bidiretional flow of charged particles
    • One half cycle above baseline and second phase beloe baseline
  4. Define Pulsed Waveforms
    • Interrupted unidirectinal or bidirectional
    • Most Commonly Used
  5. Waveform Shapes
    • Visual representation of current or voltage over time
    • Traditionally called by shapes or characteristics
    • Shape- rectangular, sinusoidal, spike, square, triangular
    • Characteristic- faradic (direct), high-voltage, pulsed, interferential, russian
  6. Time Dependent Parameters
    • Phases
    • Phase Duration
    • Interphase Interval
    • Pulse duration (width)
    • Interpulse Interval
    • Rise time/ Fall Time
  7. Monophasic
    Pulse is equal to phase
  8. Biphasic
    • Pulse one direction from baseline then opposite direction before pulse is over
    • Made up of 2 phases
    • Can be Symmetrical or asymmetrical
  9. Biphasic Asymmetrical Balanced
    Phase charges are electrically equal
  10. Biphasic Asymmetrical Unbalanced
    • Phase charges eletricall unequal
    • Wil have positive or negative charge
  11. Phase Duration
    Time elasped from beginnig to end of one phase
  12. Intraphase Interval
    • Time between two successive phases when no electrical activity occures
    • May also be called intrpulse interval
  13. Pulse Duration
    • Width
    • Time elapsed from beginning to end of all phases of one pulse
    • Length of time one pulse lasts
    • Sum of all phases of a pulsed current and intraphase interval
    • controls labeled pulse width
  14. Interpulse Interval
    Time between two successive pulses
  15. Rise Time
    Time it take for an individual stimulus to reach a peak level of magnitude
  16. Decay Time
    Time it takes for an indeividual stimulus to return to zero
  17. Define Frequency / Rate
    • Repetition rate of a waveform
    • Pulses per second delivered per unit of time
    • Low- less than 1000pps
    • Medium - 1000-10000pps
    • High - greater than 10,000pps
    • Controls often labeled rate
    • Hz pps
  18. Period
    Time from a referene point of a pulse to the identical point of the next pulse
  19. Modulation
    Automatic sequential variation in the amplitude, pulse, and/or cycle duration and frquency of current during a series of pulses or cycles
  20. Burst
    • Finite series of pulses
    • Build into machine
  21. Train
    Continuous repetitive sequence of pulses or cycles of pulsed current
  22. Beat
    • Mixing of alternating current at different fequencies taht are out of phase
    • used with interferential current
  23. Amplitude and Tissue Response
    • Intensity
    • Strength of response of sensory or motor fibers
    • More= deper fibers reached
  24. Pulse Duration and Tissue Response
    • Ease of getting a muscle contraction
    • Longer = less intensity and more uncomfortable
  25. Frequency and Tissue Response
    • quality of muscle contration
    • rate of fiber fatigue
    • Increase frequency increase fatigue
  26. Waveform and Tissue Response
    • Effectiveness
    • Comfort
  27. Comfort
    • High Frequency 200pps/hz
    • Short Duration 50 usec
    • Low Intensity mA
  28. Discomfort
    • Low Frequency 20pps/Hz
    • Long duration 200usec
    • High Intensity