Chapter 1: Introduction
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| SPRINT
®
PNS System – Clinician Instruction for Use [L0090-MAN-000 Rev F]
Glossary
Amplitude – the level of current flowing during the stimulus pulse. The Amplitude is measured in
milliamperes (mA). See Figure G.1
G.1: Stimulus waveform; Two stimulus pulses are shown
Burst – the portion of a stimulation cycle during which stimulus pulses are delivered at the maximum
programmed amplitude and pulse duration (Figure G.2).
Figure G.2 One cycle of stimulation, composed of four periods:
ramp up, burst, ramp down, and gap.
Charge – The total magnitude of electrical charge delivered by the rectangular stimulus pulse. The per
pulse charge of a stimulus pulse in nanoCoulombs (nC) is equal to the product of Amplitude and Pulse
Duration (nC =mA x µs).
Cycle – the period of time for the ramp up, burst, ramp down, and gap periods of stimulation to each
occur once (Figure G.2).
Duty Cycle – the percent of time full stimulus pulses are being delivered during one cycle of stimulation.
(ramps are counted at half the actual time)
Electrode – a conductor in electrical contact with tissue to transfer electric current from a stimulator to
the body of a patient. The distal exposed metal portion of the Sprint MicroLead is the electrode.
Frequency – the number of stimulus pulses delivered per second on the (or each) channel / Lead.
Measured in Hertz (Hz). See Figure G.1.