An implant for chronic selective stimulation of nerves

A Partial-Current-Steering Biphasic Stimulation Driver for Vestibular Prostheses

“…In such a waveform the first pulse causes activation, followed by a second one with opposite polarity to balance the charge delivered by the first [9]. However, it has been reported [10] that two opposite pulses back to back could act to prevent the generation of an action potential, or could require more energy to produce an action potential. To overcome this, a short time delay needs to be introduced between the pulses.…”

Control of urinary bladder function with devices: successes and failures

“…However, methods to increase safety by reducing the charge per phase used to achieve anodal block are being examined (Vuckovic and Rijkhoff, 2004). Additionally, implantable stimulators capable of producing the waveforms generally required for anodal blocking do not exist, although they are under development (Bugbee et al, 2001;Rijkhoff, 2004a). Although anodal blocking allows selective activation of the bladder, posterior rhizotomies may still be required to allow voiding.…”

Towards a Bionic Neural Link for Implantable Prosthetics

“…These have been chosen to focus the stimuli and thus minimise cross-talk. Moreover, the stimulation profile is designed to take a balanced biphasic waveform; to ensure no overall charge buildup, with refractory period inserted between the inverted phases; to reduce fatigue and thus improve efficiency [13]. The channel interleaving and waveform profile generation is implemented using a custom state-machine design to derive the phases required.…”