Related Experiment Video
Updated: Oct 17, 2025
11:28
Recording Network Activity in Spinal Nociceptive Circuits Using Microelectrode Arrays
Published on: February 9, 2022
3.1K
3D microelectrode cluster and stimulation paradigm yield powerful analgesia without noticeable adverse effects
Matilde Forni1, Palmi Thor Thorbergsson1, Jonas Thelin1
1Neuronano Research Center, Department of Experimental Medical Sciences, Medical Faculty, Lund University, Medicon Village, Scheelevägen 2, Lund, 223 81, Sweden.
Science Advances
|October 8, 2021
Summary
Researchers developed a new microelectrode technology for precise brain stimulation, offering powerful pain relief without side effects. This breakthrough targets persistent pain by selectively inhibiting pain signals in the brainstem.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Pain Research
Background:
- Persistent pain significantly reduces patient quality of life.
- Existing treatments for pain lack efficacy and often cause side effects.
- Brainstem pain control systems offer potent analgesia but are difficult to target selectively.
Purpose of the Study:
- To develop a novel method for precise, selective stimulation of brainstem pain pathways.
- To overcome the challenge of separating analgesia from unwanted side effects.
- To investigate the efficacy and selectivity of a new microelectrode technology for pain management.
Main Methods:
- Developed a biocompatible, gelatin-embedded cluster of ultrathin microelectrodes.
- Performed high-definition, three-dimensional stimulation in the periaqueductal gray/dorsal raphe nucleus of awake rats.
- Assessed analgesia using motor reactions and intracortical signals, and evaluated behavioral side effects.
Main Results:
- Identified individual-specific microelectrode subsets for reliable pain inhibition in normal and hyperalgesia states.
- Achieved strong pain inhibition without noticeable behavioral side effects.
- Demonstrated highly selective action with minimal impact on gait, resting cortical activity, and tactile responses.
Conclusions:
- The developed microelectrode cluster and stimulation paradigm enable powerful, fine-tuned, and selective analgesia.
- This technology offers a promising approach for treating persistent pain with reduced side effects.
- The findings highlight the potential for precise neuromodulation in managing chronic pain conditions.
