The DS8R Biphasic Constant Current Stimulator is a discrete-pulse, constant current stimulator designed for human neuroscience and neurophysiology research involving nerve and muscle stimulation via surface electrodes. It supports multiple stimulation modes and is engineered for flexibility and precision in demanding research environments.
The DS8R is supplied in a package which includes a mains power cable, operator’s manual, a USB cable and software for real-time, external, visual control of electrical stimulation.
The DS8R delivers monophasic or biphasic rectangular pulses with durations up to 2 ms. It provides an output current range of 0–1000 mA in 100 µA steps (from a 400 V compliance voltage), subject to a pulse energy limit of 300 mJ and the resistance of the skin-electrode interface.
The stimulator can be triggered via:
This makes it easy to integrate into experimental setups requiring precise, repeatable stimulation timing.
The DS8R supports:
In biphasic mode, researchers can configure the stimulus/recovery phase ratio from 10% to 100% in 1% steps, maintaining charge neutrality to minimize electrode polarization and reduce subject discomfort during prolonged stimulation. At 100%, both phases are identical; decreasing the ratio reduces recovery phase amplitude while extending its duration to preserve total charge balance.
The DS8R is the only stimulator in our triggered-pulse product line that offers real-time external control of stimulus parameters, supporting:
These features allow researchers to adjust stimulus intensity dynamically during protocols, enabling closed-loop or adaptive stimulation paradigms.
Note: The analogue voltage input defines the current amplitude, not the shape of the pulse. Output pulse shape remains rectangular and discrete.
A free firmware upgrade is available for applications requiring high-frequency stimulation up to 10 kHz, such as transcutaneous spinal cord stimulation (TSCS). This is suitable for protocols based on Russian stimulation methods and is used in rehabilitation research, including studies on spinal cord injury and stroke recovery.
The DS8R is intended for non-clinical human research and meets stringent safety requirements for laboratory use. However, due to its maximum pulse energy of 300 mJ, which exceeds the 50 mJ threshold set by clinical standards for evoked-potential stimulators, the DS8R is not certified as a medical device.
Important Note: This product is for research applications only. Not a medical device as defined in Regulation (EU) 2017/745 (EU MDR), Swiss Medical Devices Ordinance (MedDO, SR 812.213), or FDA 21 CFR Part 860. Not designed or intended to be used for diagnosis, treatment of disease or any other medical purposes.
