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Electroneurogram and ENG

Robert A Coker, Erik Robert Zellmer, Daniel W Moran
OBJECTIVE: Successful use of a prosthetic limb by an amputee is facilitated by haptic feedback - both a sense of touch and proprioception. Stimulating afferent fibers within peripheral nerves has been shown to provide somatosensation enabling amputees to modulate the control of prosthetic limbs. Peripheral nerve interfaces (PNIs) have also been used to decode patients' motor intentions. It seems ideal to use PNIs to record efferent fibers for motor control while stimulating afferent fibers to create concurrent sensory feedback...
November 9, 2018: Journal of Neural Engineering
Sergio H Duenas-Jimenez, Luis Castillo Hernandez, Braniff de la Torre Valdovinos, Gerardo Mendizabal Ruiz, Judith M Duenas Jimenez, Viviana Ramirez Abundis, Irene Guadalupe Aguilar Garcia
In brain cortex-ablated cats (BCAC), hind limb motoneurons activity patterns were studied during fictive locomotion (FL) or fictive scratching (FS) induced by pinna stimulation. In order to study motoneurons excitability: heteronymous monosynaptic reflex (HeMR), intracellular recording, and individual Ia afferent fiber antidromic activity (AA) were analyzed. The intraspinal cord microinjections of serotonin or glutamic acid effects were made to study their influence in FL or FS During FS, HeMR amplitude in extensor and bifunctional motoneurons increased prior to or during the respective electroneurogram (ENG)...
September 2017: Physiological Reports
Janez Rozman, Bojan Zorko, Alenka Seliškar, Matjaž Bunc
Electroneurograms (ENGs) from superficial regions of the sciatic nerve of a dog, innervating the tibialis anterior (TA) and gastrocnemius muscles (GM), arising mainly from muscle spindles and Golgi tendon organs were recorded selectively with an implanted 33-electrode spiral cuff (cuff). Relative positions of superficial regions within the cuff were defined by delivering stimulating pulses on groups of three electrodes (GTEs) within the cuff which were in contact with them. It was found that GTEs eliciting maximum contractions of muscles were GTE No...
January 2000: Pflügers Archiv: European Journal of Physiology
Chris Clarke, Robert Rieger, Martin Schuettler, Nick Donaldson, John Taylor
Detection and classification of electroneurogram (ENG) signals in the peripheral nervous system can be achieved by velocity selective recording (VSR) using multi-electrode arrays. This paper describes an implantable VSR-based ENG recording system representing a significant development in the field since it is the first system of its type that can record naturally evoked ENG and be interfaced wirelessly using a low data rate transcutaneous link. The system consists of two CMOS ASICs one of which is placed close to the multi-electrode cuff array (MEC), whilst the other is mounted close to the wireless link...
June 2017: Medical & Biological Engineering & Computing
Lukai Liu, Paolo Bonato, Edward A Clancy
The central nervous system regulates recruitment and firing of motor units to modulate muscle tension. Estimation of the firing rate time series is typically performed by decomposing the electromyogram (EMG) into its constituent firing times, then lowpass filtering a constituent train of impulses. Little research has examined the performance of different estimation methods, particularly in the inevitable presence of decomposition errors. The study of electrocardiogram (ECG) and electroneurogram (ENG) firing rate time series presents a similar problem, and has applied novel simulation models and firing rate estimators...
December 2016: Journal of Electromyography and Kinesiology
Dongjin Seo, Ryan M Neely, Konlin Shen, Utkarsh Singhal, Elad Alon, Jan M Rabaey, Jose M Carmena, Michel M Maharbiz
The emerging field of bioelectronic medicine seeks methods for deciphering and modulating electrophysiological activity in the body to attain therapeutic effects at target organs. Current approaches to interfacing with peripheral nerves and muscles rely heavily on wires, creating problems for chronic use, while emerging wireless approaches lack the size scalability necessary to interrogate small-diameter nerves. Furthermore, conventional electrode-based technologies lack the capability to record from nerves with high spatial resolution or to record independently from many discrete sites within a nerve bundle...
August 3, 2016: Neuron
A Geramipour, S Makki, A Erfanian
Individuals with spinal cord injury or neurological disorders have problems in urinary bladder storage and in voiding function. In these people, the detrusor of bladder contracts at low volume and this causes incontinence. The goal of bladder control is to increase the bladder capacity by electrical stimulation of relative nerves such as pelvic nerves, sacral nerve roots or pudendal nerves. For this purpose, the bladder pressure has to be monitored continuously. In this paper, we propose a method for real-time estimating the bladder pressure using artificial neural network...
2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Sivylla E Paraskevopoulou, Amir Eftekhar, Nishanth Kulasekeram, Christofer Toumazou
This paper presents an AC-coupled instrumentation amplifier for electroneurogram (ENG) activity recording. For this design, we evaluate gain and noise requirements based on interference sources (electrodes, power line, EMG). The circuit has been implemented in a commercially-available 0.35μm CMOS technology with total power consumption 460μW. The amplifier achieves CMRR 107 dB and integrated input referred noise 940 nV. The gain is 63 dB and the bandwidth is 0.5 Hz- 13 kHz. The chosen topology enables to minimise on-chip capacitance (only 27 pF), with a total chip area of 0...
August 2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Elena Bueno-Gracia, José Miguel Tricás-Moreno, Pablo Fanlo-Mazas, Miguel Malo-Urriés, María Haddad-Garay, Elena Estébanez-de-Miguel, César Hidalgo-García, Alazne Ruiz-de-Escudero Zapico
INTRODUCTION: Ultrasonography is a tool that has advanced a great deal in the diagnosis of neural compressive pathologies, such as carpal tunnel syndrome (CTS). In order to plan the treatment it is important to establish the severity of the pathology, which means that it would be important to know the capacity of ultrasonography to determine the extent to which the median nerve is compromised at this level. AIM: To investigate the correlation between ultrasound measurements and electrophysiological severity in patients with CTS...
November 16, 2015: Revista de Neurologia
B W Metcalfe, D J Chew, C T Clarke, N de N Donaldson, J T Taylor
BACKGROUND: This paper describes a series of experiments designed to verify a new method of electroneurogram (ENG) recording that enables the rate of neural firing within prescribed bands of propagation velocity to be determined in real time. Velocity selective recording (VSR) has been proposed as a solution to the problem of increasing the information available from an implantable neural interface (typically with electrodes in circumferential nerve cuffs) and has been successful in transforming compound action potentials into the velocity domain...
August 15, 2015: Journal of Neuroscience Methods
Nan Xia, Jin-Mei Xu, Nan Zhao, Qing-Song Zhao, Ming Li, Zhi-Feng Cheng
Neuropathy is observed in 50% of diabetic patients with diabetic foot. This study attempted to explore the potential role of human mesenchymal stem cells-umbilical cord blood (hMSCs-UC) in femoral nerve (FN) neuropathy. The model rats were established by one time administration of streptozotocin and empyrosis on the dorsal hind foot. At 3d, 7d, 14d after treatment with hMSCs-UC or saline through left femoral artery, the serum NGF was examined by ELISA; NF-200 expression in FN was evaluated by immunohistochemistry; the diameter and roundness of FN, the ratio of capillary and muscular fiber of gastrocnemius were calculated under light microscope; and neuronal degenerations, such as demyelization, axonal atrophy, and loose arrangement of nerve fibers, were observed by electronic microscope...
June 15, 2015: Neuroscience Letters
Benjamin Metcalfe, Daniel Chew, Chris Clarke, Nick Donaldson, John Taylor
This paper presents results from a pilot experiment in which the technique of velocity selective recording (VSR) was used to identify naturally occurring electroneurogram (ENG) signals within the intact nerve of a rat. Signals were acquired using a set of electrodes placed along the length of the nerve, formed from simple wire hooks. This basic form of recording has already been applied in-vivo to the analysis of electrically excited compound action potentials (CAPs) in both pig and frog, however, this method has never before been used to identify naturally occurring neural signals...
2014: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
M Milone, M N Di Minno, P Maietta, O Shatalova, M Musella, F Milone
AIM: Although saphenous nerve (SN) injury represents a complication of great saphenous vein (GSV) stripping, little is know about the techniques to minimize the risk of nerve injury. This is still controversial if the stripping direction could be related to the incidence of nerve injury. METHODS: A prospective comparative study to compare upwards and downwards total GSV stripping during saphenectomy with regard to the occurrence of postoperative SN injury has been designed...
June 2015: International Angiology: a Journal of the International Union of Angiology
Alexandre Goguin, Frédéric Lesage, Hugues Leblond, Mélanie Pélégrini-Issac, Serge Rossignol, Habib Benali
A low-cost device using diffuse optical imaging (DOI) for measuring in vivo hemodynamic changes in the spinal cord has been developed. The proposed system is aimed at monitoring for the first time real-time hemodynamic changes associated with intraspinal rhythmic motor activity monitored by electroneurogram (ENG) evoked in paralyzed cats (fictive locomotion). The device contains the emitting and collecting probes within a saddle that fits over a vertebra and has been developed with discrete component circuits...
October 2010: IEEE Transactions on Biomedical Circuits and Systems
R Rieger
This paper presents a low-noise front-end amplifier with configurable gain, targeting the recording of small signals, such as the electrocardiogram (ECG) or electroneurogram (ENG). The circuit consists of a continuous-time input stage using lateral bipolar transistors realized in complementary metal-oxide semiconductor (CMOS) technology followed by a switched-capacitor integrating stage. The voltage gain is adjustable by varying the phase delay between two system clocks. Simulated and measured results for a chip fabricated in 0...
June 2011: IEEE Transactions on Biomedical Circuits and Systems
M Veternik, M Simera, J Jakus, I Poliacek
Electrical signals recorded from nerves/muscles represent the fundamentals for experimental data analysis including an assessment of respiratory motor output. The present work, based on theoretical model, is focused on the linearity and variability of rectified and integrated electroneurogram (ENG)/electromyogram (EMG) signals in relation to the frequency of spike incidence and moving average window width used for processing of signals. Our simulations of multipotential signals (multiunit action potentials) originating from an overlapping of four single units with phase shifts firing at two frequencies demonstrates that (1) integrated ENG/EMG signals are only approximately linearly proportional to the frequency of action potentials in the superposition - multipotential and (2) the width of the moving average window strongly influences the range (dispersion) of integrated values...
2013: Advances in Experimental Medicine and Biology
Jun-Uk Chu, Kang-Il Song, Sungmin Han, Soo Hyun Lee, Ji Yoon Kang, Dosik Hwang, Jun-Kyo Francis Suh, Kuiwon Choi, Inchan Youn
Cutaneous afferent activities recorded by a nerve cuff electrode have been used to detect the stance phase in a functional electrical stimulation system for foot drop correction. However, the implantation procedure was difficult, as the cuff electrode had to be located on the distal branches of a multi-fascicular nerve to exclude muscle afferent and efferent activities. This paper proposes a new gait phase detection scheme that can be applied to a proximal nerve root that includes cutaneous afferent fibers as well as muscle afferent and efferent fibers...
May 2013: Physiological Measurement
Paul B Yoo, Nathan B Lubock, Juan G Hincapie, Stephen B Ruble, Jason J Hamann, Warren M Grill
OBJECTIVE: Not fully understanding the type of axons activated during vagus nerve stimulation (VNS) is one of several factors that limit the clinical efficacy of VNS therapies. The main goal of this study was to characterize the electrical recruitment of both myelinated and unmyelinated fibers within the cervical vagus nerve. APPROACH: In anesthetized dogs, recording nerve cuff electrodes were implanted on the vagus nerve following surgical excision of the epineurium...
April 2013: Journal of Neural Engineering
J C Papakostas, E Douitsis, I Sarmas, S Avgos, A Kyritsis, M Matsagkas
OBJECTIVES: To examine and compare the effects of downwards versus upwards total stripping of great saphenous vein (GSV) on saphenous nerve (SN) injury using clinical and electrophysiological studies. METHODS: Fifty patients with varicosities were equally and randomly assigned to undergo total, upwards stripping (group A) or downwards stripping (group B) of GSV during saphenectomy. SN function was measured with electroneurogram (ENG) before operation, two weeks and 12 weeks after, in order to record the incidence and type of SN injury...
February 2014: Phlebology
Jun-Uk Chu, Kang-Il Song, Sungmin Han, Soo Hyun Lee, Jinseok Kim, Ji Yoon Kang, Dosik Hwang, Jun-Kyo Francis Suh, Kuiwon Choi, Inchan Youn
Cuff electrodes are effective for chronic electroneurogram (ENG) recording while minimizing nerve damage. However, the ENG signals are usually contaminated by electromyogram (EMG) activity from the surrounding muscles, stimulus artifacts produced by the electrical stimulation and noise generated in the first stage of the neural signal amplifier. This paper proposed a new cuff electrode to reduce the interference from EMG signals and stimulus artifacts. As a result, when an additional middle electrode was placed at the center of the cuff electrode, a significant improvement in the signal-to-interference ratio was achieved at 11% for the EMG signals and 12% for the stimulus artifacts when compared to a conventional tripolar cuff...
June 2012: Physiological Measurement
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