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https://www.readbyqxmd.com/read/29443363/sheets-glide-assisted-intraocular-placement-of-the-argus-ii-retinal-prosthesis
#1
Avni P Finn, Lejla Vajzovic
BACKGROUND AND OBJECTIVE: As an increasing number of vitreoretinal surgeons are implanting retinal prosthesis devices, the need to share surgical techniques to ease implantation in challenging scenarios grows. The authors share a technique to aide in overcoming a challenge associated with uveal prolapse in a patient undergoing Argus II retinal prosthesis (Second Sight Medical Products, Sylmar, CA) implantation. PATIENTS AND METHODS: A surgical technique is discussed and demonstrated using a video (Video available at www...
February 1, 2018: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/29443095/cystometric-and-external-urethral-sphincter-measurements-in-awake-rats-with-implanted-catheter-and-electrodes-allowing-for-repeated-measurements
#2
Elena E Foditsch, Karin Roider, Andrea M Sartori, Thomas M Kessler, Sabik Raj Kayastha, Ludwig Aigner, Marc P Schneider
Lower urinary tract function is mainly assessed by means of cystometric bladder function analysis in rodents. Conventional cystometries are usually performed as terminal analysis under urethane anesthesia. It is well known that anesthetic drugs can influence bladder function. Hence, the aim of this technique is to perform cystometric measurements of the urinary bladder and external urethral sphincter in lightly restrained awake rats. For this purpose, a bladder catheter is implanted into the bladder dome. Subsequently, two electrodes are implanted bilateral to the external urethral sphincter and a ground electrode is sutured to a non-responsive skeletal muscle...
January 30, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29443088/simultaneous-video-eeg-ecg-monitoring-to-identify-neurocardiac-dysfunction-in-mouse-models-of-epilepsy
#3
Vikas Mishra, Nicole M Gautier, Edward Glasscock
In epilepsy, seizures can evoke cardiac rhythm disturbances such as heart rate changes, conduction blocks, asystoles, and arrhythmias, which can potentially increase risk of sudden unexpected death in epilepsy (SUDEP). Electroencephalography (EEG) and electrocardiography (ECG) are widely used clinical diagnostic tools to monitor for abnormal brain and cardiac rhythms in patients. Here, a technique to simultaneously record video, EEG, and ECG in mice to measure behavior, brain, and cardiac activities, respectively, is described...
January 29, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29442363/increased-neuronal-synchrony-prepares-mesial-temporal-networks-for-seizures-of-neocortical-origin
#4
Amrit Misra, Xianda Long, Michael R Sperling, Ashwini D Sharan, Karen A Moxon
OBJECTIVE: To gain understanding of the neuronal mechanisms underlying regional seizure spread, the impact of regional synchrony between seizure focus and downstream networks on neuronal activity during the transition to seizure in those downstream networks was assessed. METHODS: Seven patients undergoing diagnostic intracranial electroencephalographic studies for surgical resection of epileptogenic regions were implanted with subdural clinical electrodes into the cortex (site of seizure initiation) and mesial temporal lobe (MTL) structures (downstream) as well as microwires into MTL...
February 14, 2018: Epilepsia
https://www.readbyqxmd.com/read/29434534/assessment-of-cochlear-function-during-cochlear-implantation-by-extra-and-intracochlear-electrocochleography
#5
Adrian Dalbert, Flurin Pfiffner, Marco Hoesli, Kanthaiah Koka, Dorothe Veraguth, Christof Roosli, Alexander Huber
Objective: The aims of this study were: (1) To investigate the correlation between electrophysiological changes during cochlear implantation and postoperative hearing loss, and (2) to detect the time points that electrophysiological changes occur during cochlear implantation. Material and Methods: Extra- and intracochlear electrocochleography (ECoG) were used to detect electrophysiological changes during cochlear implantation. Extracochlear ECoG recordings were conducted through a needle electrode placed on the promontory; for intracochlear ECoG recordings, the most apical contact of the cochlear implant (CI) electrode itself was used as the recording electrode...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29432411/electrical-receptive-fields-of-retinal-ganglion-cells-influence-of-presynaptic-neurons
#6
Matias I Maturana, Nicholas V Apollo, David J Garrett, Tatiana Kameneva, Shaun L Cloherty, David B Grayden, Anthony N Burkitt, Michael R Ibbotson, Hamish Meffin
Implantable retinal stimulators activate surviving neurons to restore a sense of vision in people who have lost their photoreceptors through degenerative diseases. Complex spatial and temporal interactions occur in the retina during multi-electrode stimulation. Due to these complexities, most existing implants activate only a few electrodes at a time, limiting the repertoire of available stimulation patterns. Measuring the spatiotemporal interactions between electrodes and retinal cells, and incorporating them into a model may lead to improved stimulation algorithms that exploit the interactions...
February 12, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29432117/closed-loop-continuous-hand-control-via-chronic-recording-of-regenerative-peripheral-nerve-interfaces
#7
Philip P Vu, Zachary T Irwin, Autumn J Bullard, Shoshana W Ambani, Ian C Sando, Melanie G Urbanchek, Paul S Cederna, Cynthia A Chestek
Loss of the upper limb imposes a devastating interruption to everyday life. Full restoration of natural arm control requires the ability to simultaneously control multiple degrees of freedom of the prosthetic arm and maintain that control over an extended period of time. Current clinically available myoelectric prostheses do not provide simultaneous control or consistency for transradial amputees. To address this issue, we have implemented a standard Kalman filter for continuous hand control using intramuscular electromyography (EMG) from both regenerative peripheral nerve interfaces (RPNI) and an intact muscle within non-human primates...
February 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29428237/could-persistency-of-current-of-injury-forecast-successful-active-fixation-pacing-lead-implantation
#8
Shalaimaiti Shali, Yangang Su, Shengmei Qin, Junbo Ge
BACKGROUND: Presence of adequate current of injury (COI) was recognized as a sign of favorable pacemaker lead outcome. Little is known regarding the value of its dynamic behavior. We sought to test whether persistency of COI could predict active-fixation pacing lead performance. METHODS: COI was monitored up to 10min after right ventricular (RV) pacing electrode fixation. COI persistency was defined as the percentage of COI magnitude relative to its initial measurement...
February 7, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29428214/the-effects-of-bilateral-continuous-and-chronic-deep-brain-stimulation-of-the-medial-forebrain-bundle-in-a-rodent-model-of-depression
#9
Stephanie Thiele, Luciano Furlanetti, Lisa-Marie Pfeiffer, Volker A Coenen, Máté D Döbrössy
BACKGROUND: Clinical trials of supra-lateral medial forebrain bundle (MFB) Deep Brain Stimulation (DBS) in treatment resistant major depressive patients have shown rapid and long-term benefits. OBJECTIVE/HYPOTHESIS: The study used Flinders Sensitive Line (FSL) rats with previously identified depressive-like phenotype to assess the range of behavior modification achieved by MFB DBS. METHODS: Male FSL and wild-type Sprague-Dawley rats as Controls were tested on mood/anxiety/exploration, cognitive and motor behaviors...
February 8, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29423457/recent-advances-in-neural-electrode-tissue-interfaces
#10
Kevin Woeppel, Qianru Yang, Xinyan Tracy Cui
Neurotechnology is facing an exponential growth in the recent decades. Neural electrode-tissue interface research has been well recognized as an instrumental component of neurotechnology development. While satisfactory long-term performance was demonstrated in some applications, such as cochlear implants and deep brain stimulators, more advanced neural electrode devices requiring higher resolution for single unit recording or microstimulation still face significant challenges in reliability and longevity. In this article, we review the most recent findings that contribute to our current understanding of the sources of poor reliability and longevity in neural recording or stimulation, including the material failure, biological tissue response and the interplay between the two...
December 2017: Current Opinion in Biomedical Engineering
https://www.readbyqxmd.com/read/29421549/unique-electrophysiological-and-impedance-signatures-between-encapsulation-types-an-analysis-of-biological-utah-array-failure-and-benefit-of-a-biomimetic-coating-in-a-rat-model
#11
Patrick A Cody, James R Eles, Carl F Lagenaur, Takashi D Y Kozai, X Tracy Cui
Intracortical microelectrode arrays, especially the Utah array, remain the most common choice for obtaining high dimensional recordings of spiking neural activity for brain computer interface and basic neuroscience research. Despite the widespread use and established design, mechanical, material and biological challenges persist that contribute to a steady decline in recording performance (as evidenced by both diminished signal amplitude and recorded cell population over time) or outright array failure. Device implantation injury causes acute cell death and activation of inflammatory microglia and astrocytes that leads to a chronic neurodegeneration and inflammatory glial aggregation around the electrode shanks and often times fibrous tissue growth above the pia along the bed of the array within the meninges...
January 31, 2018: Biomaterials
https://www.readbyqxmd.com/read/29420859/amygdala-stimulation-induced-apnea-is-attention-and-nasal-breathing-dependent
#12
William P Nobis, Stephen Schuele, Jessica W Templer, Guangyu Zhou, Gregory Lane, Joshua M Rosenow, Christina Zelano
OBJECTIVE: Evidence suggests disordered breathing is critically involved in Sudden unexplained death in epilepsy (SUDEP). To that end, evaluating structures that are activated by seizures and can activate brain regions that produce cardiorespiratory changes can further our understanding of the pathophysiology of SUDEP. Prior preclinical studies have shown that electrical stimulation of the human amygdala induces apnea, suggesting a role for the amygdala in controlling respiration. In this study, we aimed to both confirm these findings in a larger group of patients with intractable temporal lobe epilepsy (TLE) and also further explore the anatomical and cognitive properties of this effect...
February 8, 2018: Annals of Neurology
https://www.readbyqxmd.com/read/29417555/the-immediate-and-short-term-effects-of-bilateral-intrahippocampal-depth-electrodes-on-verbal-memory
#13
Christoph Helmstaedter, Gerrit H Gielen, Juri-Alexander Witt
In contrast to previous studies, Ljung et al. provide evidence of permanent cognitive consequences of bilateral intrahippocampal depth electrodes for verbal memory in patients who were not operated or operated in the right temporal lobe. Stimulated by this, we provide historical confirmatory and supplementary evidence of the detrimental effect of bilateral depth electrodes implanted along the longitudinal axis of the hippocampus on verbal learning and especially on delayed verbal memory and recognition performance...
February 7, 2018: Epilepsia
https://www.readbyqxmd.com/read/29417275/cochlear-implantation-using-the-underwater-technique-long-term-results
#14
Konrad Johannes Stuermer, David Schwarz, Andreas Anagiotos, Ruth Lang-Roth, Karl-Bernd Hüttenbrink, Jan Christoffer Luers
INTRODUCTION: The opening of the round window and the insertion of the electrode array into the scala tympani during cochlear implant surgery can lead to a pressure shock of the delicate inner ear structures. By filling the tympanic cavity with Ringer Solution during these surgical steps (underwater technique), the hydrostatic pressure of the fluid acts as a smooth pressure stabilizer, avoiding a pressure shock of the inner ear structures. The aim of this retrospective study was to present long-term results of this new method of cochlear implantation in underwater technique...
February 7, 2018: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29415442/electric-field-comparison-between-microelectrode-recording-and-deep-brain-stimulation-systems-a-simulation-study
#15
Fabiola Alonso, Dorian Vogel, Johannes Johansson, Karin Wårdell, Simone Hemm
The success of deep brain stimulation (DBS) relies primarily on the localization of the implanted electrode. Its final position can be chosen based on the results of intraoperative microelectrode recording (MER) and stimulation tests. The optimal position often differs from the final one selected for chronic stimulation with the DBS electrode. The aim of the study was to investigate, using finite element method (FEM) modeling and simulations, whether lead design, electrical setup, and operating modes induce differences in electric field (EF) distribution and in consequence, the clinical outcome...
February 6, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29414819/dbstar-an-open-source-tool-kit-for-imaging-analysis-with-patient-customized-deep-brain-stimulation-platforms
#16
Peter M Lauro, Shane Lee, Minkyu Ahn, Andrei Barborica, Wael F Asaad
BACKGROUND/OBJECTIVES: To create an open-source method for reconstructing microelectrode recording (MER) and deep brain stimulation (DBS) electrode coordinates along multiple parallel trajectories with patient-specific DBS implantation platforms to facilitate DBS research. METHODS: We combined the surgical geometry (extracted from WayPoint Planner), pre-/intra-/postoperative computed tomography (CT) and/or magnetic resonance (MR) images, and integrated them into the Analysis of Functional NeuroImages (AFNI) neuroimaging analysis environment using functions written in Python...
February 7, 2018: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/29414738/integrated-optoelectronic-microprobes
#17
REVIEW
L Rudmann, M T Alt, D Ashouri Vajari, T Stieglitz
Optogenetics opened not only new exciting opportunities to interrogate the nervous system but also requires adequate probes to facilitate these wishes. Therefore, a multidisciplinary effort is essential to match these technical opportunities with biological needs in order to establish a stable and functional material-tissue interface. This in turn can address an optical intervention of the genetically modified, light sensitive cells in the nervous system and recording of electrical signals from single cells and neuronal networks that result in behavioral changes...
February 4, 2018: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29414538/antiepileptic-drug-reduction-and-increased-risk-of-stimulation-evoked-focal-to-bilateral-tonic-clonic-seizure-during-cortical-stimulation-in-patients-with-focal-epilepsy
#18
Kevin G Hampel, Asier Gómez-Ibáñez, Mercedes Garcés-Sánchez, David Hervás-Marín, Irene Cano-López, Esperanza González-Bono, Rebeca Conde-Sardón, Antonio Gutiérrez-Martín, Vicente Villanueva
INTRODUCTION: Stimulation-evoked focal to bilateral tonic-clonic seizure (FBTCS) can be a stressful and possibly harmful adverse event for patients during cortical stimulation (CS). We evaluated if drug load reduction of antiepileptic drugs (AEDs) during CS increases the risk of stimulation-evoked FBTCS. MATERIAL AND METHODS: In this retrospective cohort study, we searched our local database for patients with drug-resistant epilepsy who underwent invasive video-EEG monitoring and CS in the University Hospital la Fe Valencia from January 2006 to November 2016...
February 1, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29414094/a-silicon-based-neural-probe-with-densely-packed-low-impedance-titanium-nitride-microelectrodes-for-ultrahigh-resolution-in-vivo-recordings
#19
Richárd Fiáth, Bogdan Cristian Raducanu, Silke Musa, Alexandru Andrei, Carolina Mora Lopez, Chris van Hoof, Patrick Ruther, Arno Aarts, Domonkos Horváth, István Ulbert
In this study, we developed and validated a single-shank silicon-based neural probe with 128 closely-packed microelectrodes suitable for high-resolution extracellular recordings. The 8-mm-long, 100-µm-wide and 50-µm-thick implantable shank of the probe fabricated using a 0.13-µm complementary metal-oxide-semiconductor (CMOS) metallization technology contains square-shaped (20 × 20 µm2), low-impedance (~ 50 kΩ at 1 kHz) recording sites made of rough and porous titanium nitride which are arranged in a 32 × 4 dense array with an inter-electrode pitch of 22...
January 31, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29413867/electrochemical-removal-of-biofilms-from-titanium-dental-implant-surfaces
#20
Sebastian Schneider, Michael Rudolph, Vanessa Bause, Andreas Terfort
The infection of dental implants may cause severe inflammation of tissue and even bone degradation if not treated. For titanium implants, a new, minimally invasive approach is the electrochemical removal of the biofilms including the disinfection of the metal surface. In this project, several parameters, such as electrode potentials and electrolyte compositions, were varied to understand the underlying mechanisms. Optimal electrolytes contained iodide as well as lactic acid. Electrochemical experiments, such as cyclic voltammetry or measurements of open circuit potentials, were performed in different cell set-ups to distinguish between different possible reactions...
January 29, 2018: Bioelectrochemistry
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