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Simulation study of spinal cord stimulation evoked compound action potential / 生物医学工程学杂志
Journal of Biomedical Engineering ; (6): 232-240, 2021.
Article in Chinese | WPRIM | ID: wpr-879270
ABSTRACT
Spinal cord stimulation (SCS) for pain is usually implanted as an open loop system using unchanged parameters. To avoid the under and over stimulation caused by lead migration, evoked compound action potentials (ECAP) is used as feedback signal to change the stimulating parameters. This study established a simulation model of ECAP recording to investigate the relationship between ECAP component and dorsal column (DC) fiber recruitment. Finite element model of SCS and multi-compartment model of sensory fiber were coupled to calculate the single fiber action potential (SFAP) caused by single fiber in different spinal cord regions. The synthetized ECAP, superimposition of SFAP, could be considered as an index of DC fiber excitation degree, because the position of crests and amplitude of ECAP corresponds to different fiber diameters. When 10% or less DC fibers were excited, the crests corresponded to fibers with large diameters. When 20% or more DC fibers were excited, ECAP showed a slow conduction crest, which corresponded to fibers with small diameters. The amplitude of this slow conduction crest increased as the stimulating intensity increased while the amplitude of the fast conduction crest almost remained unchanged. Therefore, the simulated ECAP signal in this paper could be used to evaluate the degree of excitation of DC fibers. This SCS-ECAP model may provide theoretical basis for future clinical application of close loop SCS base on ECAP.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Spinal Cord / Computer Simulation / Action Potentials / Electric Stimulation / Evoked Potentials / Spinal Cord Stimulation Language: Chinese Journal: Journal of Biomedical Engineering Year: 2021 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Spinal Cord / Computer Simulation / Action Potentials / Electric Stimulation / Evoked Potentials / Spinal Cord Stimulation Language: Chinese Journal: Journal of Biomedical Engineering Year: 2021 Type: Article