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implantable electrodes

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https://www.readbyqxmd.com/read/29240666/induction-of-inflammation-in-vivo-by-electrocardiogram-sensor-operation-using-wireless-power-transmission
#1
Jin-Chul Heo, Beomjoon Kim, Yoon-Nyun Kim, Dae-Kwang Kim, Jong-Ha Lee
Prolonged monitoring by cardiac electrocardiogram (ECG) sensors is useful for patients with emergency heart conditions. However, implant monitoring systems are limited by lack of tissue biocompatibility. Here, we developed an implantable ECG sensor for real-time monitoring of ventricular fibrillation and evaluated its biocompatibility using an animal model. The implantable sensor comprised transplant sensors with two electrodes, a wireless power transmission system, and a monitoring system. The sensor was inserted into the subcutaneous tissue of the abdominal area and operated for 1 h/day for 5 days using a wireless power system...
December 14, 2017: Sensors
https://www.readbyqxmd.com/read/29240305/surgical-anatomy-of-the-round-window-implications-for-cochlear-implantation
#2
REVIEW
Jan Christoffer Luers, Karl-Bernd Hüttenbrink, Dirk Beutner
BACKGROUND: The round window is an important portal for the application of active hearing aids and cochlear implants. The anatomical and topographical knowledge about the round window region is a prerequisite for successful insertion for a cochlear implant electrode. OBJECTIVE OF REVIEW: To sum up current knowledge about the round window anatomy and to give advice to the cochlear implant surgeon for optimal placement of an electrode. TYPE OF REVIEW: Systematic Medline search...
December 14, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/29240058/-venous-thromboembolic-complications-in-patients-with-cardiovascular-implantable-electronic-devices
#3
R E Kalinin, I A Suchkov, I I Shitov, N D Mzhavanadze, V O Povarov
The problem of venous thromboembolic complications (VTECs) in patients with cardiovascular implantable electronic devices (CIEDs) is extremely important today because of an annually increasing number of surgical interventions for life-threatening arrhythmias and chronic heart failure. There are hitherto no clearly defined reliable risk factors for VTECs due to heterogeneity of the available literature data. Some sources point to elevated thrombus formation in patients with a large number of electrodes, in repeat operative interventions, in the presence of a temporary pacemaker, in implantation on the left side, silicon cover of an electrode, others refute these facts...
2017: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
https://www.readbyqxmd.com/read/29238682/cochlear-implantation-in-children-with-anomalous-cochleovestibular-anatomy-our-experience
#4
Mohnish Grover, Shitanshu Sharma, Shruti Bhargava, Shashank Nath Singh, Gaurav Gupta, Man Prakash Sharma
To report operative findings, postoperative course, and postimplantation performance in patients with cochlear malformations who underwent cochlear implantation. Seventeen patients with malformations which included enlarged vestibular aqueduct (n = 6), Mondini's dysplasia (n = 5) common cavity deformity (n = 3) and incomplete partition type 2 (n = 3) underwent cochlear implantation with Nucleus 22 straight array device at our center. Operative findings described facial nerve anatomy and cerebrospinal fluid leak...
December 2017: Indian Journal of Otolaryngology and Head and Neck Surgery
https://www.readbyqxmd.com/read/29233473/changes-in-the-electrocorticogram-after-implantation-of-intracranial-electrodes-in-humans-the-implant-effect
#5
Felice T Sun, Sharanya Arcot Desai, Thomas K Tcheng, Martha J Morrell
OBJECTIVE: Subacute and long-term electrocorticographic (ECoG) changes in ambulatory patients with depth and cortical strip electrodes were evaluated in order to determine the length of the implant effect. METHODS: ECoG records were assessed in patients with medically intractable epilepsy who had depth and/or strip leads implanted in order to be treated with brain-responsive stimulation. Changes in total spectral power, band-limited spectral power, and spike rate were assessed...
November 14, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29231915/lactobacillus-gasseri-endocarditis-on-the-aortic-valve-bioprosthesis-a-case-report
#6
Waldemar Elikowski, Małgorzata Małek-Elikowska, Monika Lisiecka, Anna Bodora, Katarzyna Wiśniewska, Zofia Oko-Sarnowska
Lactobacillus is a genus of Gram-positive, facultative anaerobic/ microaerophilic, rod-shaped bacteria. Lactobacilli constitute a significant component of the human microbiota in the oral cavity, gastrointestinal tract and female urogenital tract. They are also widely used as probiotics. Rarely, especially in patients with impaired immunity or with structural heart disease, do Lactobacilli become the pathogen responsible for serious infections, e.g. infective endocarditis (IE). CASE REPORT: The authors describe a case of an 80-year-old female with a past history of aortic valve replacement, mitral annuloplasty and pacemaker implantation admitted to hospital due to weakening, subfebrile state and chills...
November 23, 2017: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/29230247/wireless-neuromodulation-for-chronic-back-pain-delivery-of-high-frequency-dorsal-root-ganglion-stimulation-by-a-minimally-invasive-technique
#7
Bart Billet, Roel Wynendaele, Niek E Vanquathem
Objective: To evaluate the analgesic effect of a dorsal root ganglion (DRG) stimulation technology utilizing high-frequency pulse rates to treat intractable chronic back and leg pain. Methods: This case study presents the outcomes, with a novel, wireless, minimally invasive miniature neurostimulator system in a case of chronic back pain. The subject was implanted bilaterally with a Freedom 4A quadripolar electrode array at the L2 dorsal root ganglion. Stimulation was applied using 10 kHz pulse rate and 30 μs pulse width...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/29229347/post-operative-stridor-and-acute-respiratory-failure-after-parkinson-s-disease-deep-brain-stimulator-placement-a-case-report-and-review-of-literature
#8
Mi Wang, Wael Saasouh, Thomas Botsford, Allen Keebler, Andrew Zura, Michael S Benninger, Rafi Avitsian
BACKGROUND: Parkinson's disease (PD), a neurodegenerative disorder characterized by loss of dopaminergic neurons in the substantia nigra of the midbrain is commonly thought of as a motion disorder, but it can have significant effect on the respiratory system. Respiratory failure is the most common cause of death in these patients, but it can also affect laryngeal function causing dysphonia, dysphagia, and dysarthric speech.. Acute upper airway obstruction is a very rare finding in PD, especially in the perioperative settings...
December 8, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29228338/operative-nuances-of-stereotactic-leksell-frame-based-depth-electrode-implantation
#9
Holger Joswig, Carolyn M Benson, Andrew G Parrent, Keith W MacDougall, David A Steven
Background: For intracranial electroencephalographic monitoring, stereotactically implanted depth electrodes are increasingly used at epilepsy centers around the world. Objective: To identify pearls and pitfalls from our experience with stereotactic Leksell (Elekta AB, Stockhom, Sweden) frame-based depth electrode implantation. Methods: An intraoperative video of the implantation technique was recorded. Results: A detailed description and a video on how to implant depth electrodes using the stereotactic Leksell frame is provided...
December 7, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29227456/photopolymerized-microfeatures-guide-adult-spiral-ganglion-and-dorsal-root-ganglion-neurite-growth
#10
Linjing Xu, Alison E Seline, Braden Leigh, Mark Ramirez, C Allan Guymon, Marlan R Hansen
HYPOTHESIS: Microtopographical patterns generated by photopolymerization of methacrylate polymer systems will direct growth of neurites from adult neurons, including spiral ganglion neurons (SGNs). BACKGROUND: Cochlear implants (CIs) provide hearing perception to patients with severe to profound hearing loss. However, their ability to encode complex auditory stimuli is limited due, in part, to poor spatial resolution caused by spread of the electrical currents in the inner ear...
January 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29227449/early-outcomes-with-a-slim-modiolar-cochlear-implant-electrode-array
#11
Jonathan L McJunkin, Nedim Durakovic, Jacques Herzog, Craig A Buchman
OBJECTIVE: To describe outcomes from cochlear implantation with a new, slim modiolar electrode array. STUDY DESIGN: Retrospective cohort study. SETTING: Tertiary referral centers. PATIENTS: Adult cochlear implant candidates. INTERVENTIONS: Cochlear implantation with CI532 (Cochlear Corp). MAIN OUTCOME MEASURES: Pre- and postoperative speech perception scores, operative details, and postoperative computed tomography (CT) reconstructions of array location...
January 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29225064/intracranial-high-%C3%AE-connectivity-distinguishes-wakefulness-from-sleep
#12
Ezequiel Mikulan, Eugenia Hesse, Lucas Sedeño, Tristán Bekinschtein, Mariano Sigman, María Del Carmen García, Walter Silva, Carlos Ciraolo, Adolfo M García, Agustín Ibáñez
Neural synchrony in the γ-band is considered a fundamental process in cortical computation and communication and it has also been proposed as a crucial correlate of consciousness. However, the latter claim remains inconclusive, mainly due to methodological limitations, such as the spectral constraints of scalp-level electroencephalographic recordings or volume-conduction confounds. Here, we circumvented these caveats by comparing γ-band connectivity between two global states of consciousness via intracranial electroencephalography (iEEG), which provides the most reliable measurements of high-frequency activity in the human brain...
December 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/29223703/the-foreign-body-response-and-morphometric-changes-associated-with-mesh-style-peripheral-nerve-cuffs
#13
Michael B Christensen, Patrick A Tresco
Nerve cuffs have been used to anchor and protect penetrating electrodes in peripheral nerves and have been used as non-penetrating electrodes for neural recording and nerve stimulation. The material of choice for such applications is silicone, an inert synthetic biomaterial which elicits a minimal chronic foreign body response (FBR). While histological studies of solid silicone cuffs are available, to the best of our knowledge a comparison to other cuff designs is not well documented. Here, we describe the FBR and morphological changes that accompany nerve cuff implantation in the rat sciatic nerve by comparing a metallic mesh with and without a parylene coating to one made of silicone...
December 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29223000/bilateral-preictal-signature-of-phase-amplitude-coupling-in-canine-epilepsy
#14
Laura Gagliano, Elie Bou Assi, Dang K Nguyen, Sandy Rihana, Mohamad Sawan
Seizure forecasting would improve the quality of life of patients with refractory epilepsy. Although early findings were optimistic, no single feature has been found capable of individually characterizing brain dynamics during transition to seizure. Cross-frequency phase amplitude coupling has been recently proposed as a precursor of seizure activity. This work evaluates the existence of a statistically significant difference in mean phase amplitude coupling distribution between the preictal and interictal states of seizures in dogs with bilaterally implanted intracranial electrodes...
November 26, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29222869/new-generation-cardioverter-defibrillator-lead-with-a-floating-atrial-sensing-dipole-long-term-performance
#15
Erdal Safak, Giuseppe D Ancona, Hilmi Kaplan, Evren Caglayan, Stephan Kische, Alper Öner, Hüseyin Ince, Jasmin Ortak
OBJECTIVES: Study aim is to present the long-term performance of a new generation implantable cardioverter defibrillator (ICD) electrode with floating atrial dipole (Linox S DX, Biotronik). BACKGROUND: The single ICD electrode with a floating dipole in the atrial chamber was introduced about 15 years ago to overcome risk of inappropriate shock. METHODS: After implant, internal ECG data were prospectively collected via tele-monitoring (Home Monitoring, Biotronik)...
December 9, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29222865/multipoint-pacing-improves-peripheral-hemodynamic-response-non-invasive-assessment-using-radial-artery-tonometry
#16
Giuseppe Ciconte, Žarko Ćalović, Gabriele Vicedomini, Amarild Cuko, Luke C McSpadden, Chunlan Jiang, Kyungmoo Ryu, Igor Caporaso, Robert Stutz, Dean Winter, Massimo Saviano, Raffaele Vitale, Manuel Conti, Vincenzo Santinelli, Carlo Pappone
BACKGOUND: Multipoint left ventricular (LV) pacing (MultiPoint™ Pacing [MPP], Abbott) improves the response rate to cardiac resynchronization therapy (CRT). We evaluated the feasibility of non-invasive radial artery tonometry (RAT) to characterize arterial pressure morphology changes (pre-ejection period [PEP] and ejection duration [ED]) between conventional CRT and MPP pacing interventions. METHODS: Patients with a MPP-enabled CRT device (Quadra Assura MP™, Abbott) underwent non-invasive RAT assessment (SphygmoCor CVMS, AtCor Medical Inc...
December 9, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/29220862/a-descriptive-analysis-of-sleep-and-wakefulness-states-during-maternal-behaviors-in-postpartum-rats
#17
L Benedetto, M Rivas, M Pereira, A Ferreira, P Torterolo
Mother rats spend most of their time nursing their litter during the early stages of the postpartum period, only occasionally leaving the nest. The suckling stimulus from the pups elicits the adoption of nursing postures, during which milk ejection occurs, an event associated with the occurrence of non-REM (NREM) sleep in the rat. Despite this evidence, the characteristics of sleep during different nursing postures along the postpartum period remain unknown. The present study aims to describe the sleep pattern of mother rats while nursing, hovering over their pups and when being away from the pups...
September 1, 2017: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/29220422/atrioventricular-node-ablation-and-his-bundle-pacing
#18
Pugazhendhi Vijayaraman, Faiz A Subzposh, Angela Naperkowski
Aims: Atrioventricular node ablation (AVNA) and right ventricular pacing (RVP) are effective therapies for patients with atrial fibrillation (AF) and rapid ventricular rates. His bundle pacing (HBP) is a physiologic alternative to RVP. The aim of our study is to assess the feasibility and safety of HBP in patients undergoing AVNA and its effect on left ventricular (LV) function. Methods and results: Permanent HBP is the preferred form of ventricular pacing at our institute...
December 1, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/29220192/fluidic-microactuation-of-flexible-electrodes-for-neural-recording
#19
Flavia Vitale, Daniel Vercosa, Alexander V Rodriguez, Sushma Sri Pamulapati, Frederik Seibt, Eric Lewis, Jiaxi Stephen Yan, Krishna Badhiwala, Mohammed Adnan, Gianni Royer-Carfagni, Michael Beierlein, Caleb Kemere, Matteo Pasquali, Jacob Robinson
Soft and conductive nanomaterials like carbon nanotubes, graphene, and nanowire scaffolds have expanded the family of ultra-flexible microelectrodes that can bend and flex with the natural movement of the brain, reduce the inflammatory response and improve the stability of long-term neural recordings. However, current methods to implant these highly flexible electrodes rely on temporary stiffening agents that temporarily increase the electrode size and stiffness thus aggravating neural damage during implantation, which can lead to cell loss and glial activation that persists even after the stiffening agents are removed or dissolve...
December 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/29219843/negative-differential-resistance-effect-induced-by-metal-ion-implantation-in-sio-sub-2-sub-film-for-multilevel-rram-application
#20
Facai Wu, Shuyao Si, Tuo Shi, Xiaolong Zhao, Qi Liu, Lei Liao, Hangbing Lv, Shibing Long, Ming Liu
Pt/SiO<sub>2</sub>:metal nanoparticles (MNPs)/Pt sandwich structure is fabricated with the method of metal ion (Ag) implantation. The device exhibits multilevel storage with appropriate R<sub>off</sub>/R<sub>on</sub> ratio, good endurance and retention properties. Based on transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) analysis, we confirm that Pt nanoparticles are spurted into SiO<sub>2 </sub>film from Pt bottom electrode by Ag implantation; during electroforming, the local electric field can be enhanced by these Pt nanoparticles, meanwhile the Ag nanoparticles constantly migrate toward the Pt nanoparticles...
December 8, 2017: Nanotechnology
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