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External connection implant

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https://www.readbyqxmd.com/read/28427837/in-vitro-fatigue-tests-and-in-silico-finite-element-analysis-of-dental-implants-with-different-fixture-abutment-joint-types-using-computer-aided-design-models
#1
Satoshi Yamaguchi, Yasufumi Yamanishi, Lucas S Machado, Shuji Matsumoto, Nick Tovar, Paulo G Coelho, Van P Thompson, Satoshi Imazato
PURPOSE: The aim of this study was to evaluate fatigue resistance of dental fixtures with two different fixture-abutment connections by in vitro fatigue testing and in silico three-dimensional finite element analysis (3D FEA) using original computer-aided design (CAD) models. METHODS: Dental implant fixtures with external connection (EX) or internal connection (IN) abutments were fabricated from original CAD models using grade IV titanium and step-stress accelerated life testing was performed...
April 17, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28395539/unlocking-the-box-basic-requirements-for-an-ideal-ventricular-assist-device-controller
#2
Alexander L Medvedev, Jamshid H Karimov, Barry D Kuban, David J Horvath, Nader Moazami, Kiyotaka Fukamachi
A modern ventricular assist device (VAD) system comprises an implantable rotary blood pump and external components located outside the patient's body: a wearable controller connected to the pump via a percutaneous cable, wearable rechargeable batteries, battery charger, alternating- and direct-current power supplies, and a hospital device to control and monitor the system. If the blood pump is the "heart" of a VAD system, the controller is its "brain." The controller drives the pump's electrical motor; varies the pump speed or flow based on user commands or feedback signals; collects, processes, and stores data; performs self-diagnostics; transmits to and receives data from other system components, i...
April 11, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28348591/microbiological-sealing-analysis-of-a-tapered-connection-and-external-hexagon-system
#3
Gardel Nepomuceno Costa, Elizabeth Ferreira Martinez, Aluísio Martins de Oliveira Ruellas, Daiane Cristina Peruzzo, Júlio Cesar Joly, Marcelo Henrique Napimoga
Considering the variety of implant connection systems available in the market and the contrasting literature regarding tapered connection systems in terms of bacterial leakage, the aim of this in vitro study was to compare the effectiveness of the bacterial seal at the implant/abutment interface between an external hexagon and a tapered connection system. Twelve sets of indexed tapered connection components and twelve sets of external hexagon connection components were used for microbiological analysis. In addition, for each model, an implant with its respective prosthetic abutment was used as a negative control and another as a positive control of microbial contamination...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28339448/efficacious-dorsal-root-ganglion-stimulation-for-painful-small-fiber-neuropathy-a-case-report
#4
Paolo Maino, Eva Koetsier, Alain Kaelin-Lang, Claudio Gobbi, Roberto Perez
Small fiber neuropathy is a disorder of the peripheral nerves with typical symptoms of burning, sharp, and shooting pain and sensory disturbances in the feet. Pain treatment depends principally on the underlying etiology with concurrent administration of antidepressants, anticonvulsants, opioids, and topical treatments like capsaicin and local anesthetics. However, treatments for pain relief in these patients frequently fail. We describe the first case of intractable painful small fiber neuropathy of the foot successfully treated with spinal cord stimulation of the left L5 dorsal root ganglion...
March 2017: Pain Physician
https://www.readbyqxmd.com/read/28335384/localization-and-tracking-of-implantable-biomedical-sensors
#5
REVIEW
Ilknur Umay, Barış Fidan, Billur Barshan
Implantable sensor systems are effective tools for biomedical diagnosis, visualization and treatment of various health conditions, attracting the interest of researchers, as well as healthcare practitioners. These systems efficiently and conveniently provide essential data of the body part being diagnosed, such as gastrointestinal (temperature, pH, pressure) parameter values, blood glucose and pressure levels and electrocardiogram data. Such data are first transmitted from the implantable sensor units to an external receiver node or network and then to a central monitoring and control (computer) unit for analysis, diagnosis and/or treatment...
March 13, 2017: Sensors
https://www.readbyqxmd.com/read/28332404/conceptual-design-and-implantation-of-an-external-fixator-with-improved-mobility-for-knee-rehabilitation
#6
Gianluca Gatti
A hinged external fixator is used to allow early knee rehabilitation in case of injury or trauma, as an alternative approach to immobilization. It is mainly adopted for the treatment of dislocations, which involve tearing of the ligaments, and it basically consists of two links connected to each other by a revolute joint. Each link is fixed to the femur and tibia via pin fixation, and the revolute joint is approximately aligned to the knee flexion-extension (FE) axis. The advantage in its implantation is to protect ligament reconstruction, while allowing for an aggressive rehabilitation...
March 23, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28321800/wear-of-morse-taper-and-external-hexagon-implant-joints-after-abutment-removal
#7
Abraão M Prado, Jorge Pereira, Filipe S Silva, Bruno Henriques, Rubens M Nascimento, Cesar A M Benfatti, José López-López, Júlio C M Souza
The aim of this in vitro study was to evaluate the removal torque values on abutments and the morphological wear aspects of two different dental implant joints after immersion in a medium containing biofilm from human saliva. Twenty implant-abutment assemblies were divided into four groups in this study: (A) Morse taper free of medium containing biofilm, and (B) after contact with a medium containing biofilm from human saliva; (C) External Hexagon free of medium containing biofilm, and (D) after contact with medium containing biofilm from human saliva...
May 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28296983/comparing-the-fracture-resistance-of-alternatively-engineered-zirconia-abutments-with-original-equipment-manufactured-abutments-with-different-implant-connection-designs
#8
Joseph M Jarman, Techkouhie Hamalian, Anthony P Randi
PURPOSE: Aftermarket computer-aided design/computer-assisted manufacture (CAD/CAM) milled zirconia (Zr) abutments were recently introduced with minimal independent research regarding their fracture resistance. Third-party manufacturers often alter the original equipment manufacturers' (OEM) design with unknown effects on fracture resistance. These alterations include elimination of the titanium insert with subsequent introduction of Zr into the implant, changes to connection designs and shapes, and/or alterations to prosthetic screw design...
March 15, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28268710/inductive-passive-sensor-for-intraparenchymal-and-intraventricular-monitoring-of-intracranial-pressure
#9
Mohammad H Behfar, Emily Abada, Lauri Sydanheimo, Ken Goldman, Aaron J Fleischman, Nalin Gupta, Leena Ukkonen, Shuvo Roy
Accurate measurement of intracranial hypertension is crucial for the management of elevated intracranial pressure (ICP). Catheter-based intraventricular ICP measurement is regarded as the gold standard for accurate ICP monitoring. However, this method is invasive, time-limited, and associated with complications. In this paper, we propose an implantable passive sensor that could be used for continuous intraparenchymal and intraventricular ICP monitoring. Moreover, the sensor can be placed simultaneously along with a cerebrospinal fluid shunt system in order to monitor its function...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28248689/microleakage-at-different-implant-abutment-connections-under-unloaded-and-loaded-conditions
#10
João Paulo da Silva-Neto, Marcel Santana Prudente, Talita Souza Dantas, Plinio Mendes Senna, Ricardo Faria Ribeiro, Flávio Domingues das Neves
PURPOSE: This study evaluated the microleakage at different implant-abutment (I-A) connections under unloaded and loaded conditions. MATERIALS AND METHODS: Forty implants, specially designed with an opening at the apex, were grouped according to the I-A and screw device: external hexagon implants with titanium (EH) or EH diamond-like carbon screws fixing the abutment; internal hexagon implants with titanium screws (IH); and Morse taper implants with solid (MT) or MT passing screws (MTps) abutments...
February 28, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28226898/inductive-passive-sensor-for-intraparenchymal-and-intraventricular-monitoring-of-intracranial-pressure
#11
Mohammad H Behfar, Emily Abada, Lauri Sydanheimo, Ken Goldman, Aaron J Fleischman, Nalin Gupta, Leena Ukkonen, Shuvo Roy, Mohammad H Behfar, Emily Abada, Lauri Sydanheimo, Ken Goldman, Aaron J Fleischman, Nalin Gupta, Leena Ukkonen, Shuvo Roy, Lauri Sydanheimo, Aaron J Fleischman, Leena Ukkonen, Mohammad H Behfar, Nalin Gupta, Shuvo Roy, Ken Goldman, Emily Abada
Accurate measurement of intracranial hypertension is crucial for the management of elevated intracranial pressure (ICP). Catheter-based intraventricular ICP measurement is regarded as the gold standard for accurate ICP monitoring. However, this method is invasive, time-limited, and associated with complications. In this paper, we propose an implantable passive sensor that could be used for continuous intraparenchymal and intraventricular ICP monitoring. Moreover, the sensor can be placed simultaneously along with a cerebrospinal fluid shunt system in order to monitor its function...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28210535/magnetic-resonance-imaging-in-a-neurofibromatosis-type-2-patient-with-a-novel-mri-compatible-auditory-brainstem-implant
#12
REVIEW
Matthew Shew, Judson Bertsch, Paul Camarata, Hinrich Staecker
Auditory brainstem implantation has become a key technique for the rehabilitation of hearing in patients with neurofibromatosis type 2. The nature of this devastating genetic disease requires ongoing MRI for the patient's lifespan. Today, most auditory brainstem implants require removal of the magnet that connects the internal device to the external speech processor to undergo imaging as their disease progresses. Patients have the option of having a short procedure to have the magnet taken out and replaced each time, or alternately using a headband to secure the processor over the receiver coil of the internal device...
January 2017: Journal of Neurological Surgery Reports
https://www.readbyqxmd.com/read/28185373/dual-anchor-internal-pulse-generator-technique-may-lower-risk-of-twiddler-s-syndrome-a-case-series-and-literature-review
#13
Michał Roman Sobstyl, Mirosław Ząbek, Grażyna Brzuszkiewicz-Kuźmicka, Tomasz Pasterski
BACKGROUND: Twiddler's syndrome (TS) is described as a spontaneous rotation or intentional external manipulation of implanted internal pulse generator (IPG) for neurological or cardiac disorders. There have been identified some predisposing factors of the development of TS such as: loose subcutaneous tissue, older age of individuals undergoing deep brain stimulation (DBS) procedures, creation of too large pockets for IPG. Apart from these factors, the construction of IPG itself may predispose to the development of TS...
February 9, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28156208/image-guided-intrathecal-baclofen-pump-catheter-implantation-a-technical-note-and-case-series
#14
Shenandoah Robinson, Faith C Robertson, Hormuzdiyar H Dasenbrock, Cormac P O'Brien, Charles Berde, Horacio Padua
OBJECTIVE Medically refractory spasticity and dystonia are often alleviated with intrathecal baclofen (ITB) administration through an indwelling catheter inserted in the lumbar spine. In patients with cerebral palsy, however, there is a high incidence of concomitant neuromuscular scoliosis. ITB placement may be technically challenging in those who have severe spinal deformity or who have undergone prior instrumented thoracolumbar fusion. Although prior reports have described drilling through the lumbar fusion mass with a high-speed bur, as well as IT catheter implantation at the foramen magnum or cervical spine, these approaches have notable limitations...
February 3, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28132830/flexible-near-field-wireless-optoelectronics-as-subdermal-implants-for-broad-applications-in-optogenetics
#15
Gunchul Shin, Adrian M Gomez, Ream Al-Hasani, Yu Ra Jeong, Jeonghyun Kim, Zhaoqian Xie, Anthony Banks, Seung Min Lee, Sang Youn Han, Chul Jong Yoo, Jong-Lam Lee, Seung Hee Lee, Jonas Kurniawan, Jacob Tureb, Zhongzhu Guo, Jangyeol Yoon, Sung-Il Park, Sang Yun Bang, Yoonho Nam, Marie C Walicki, Vijay K Samineni, Aaron D Mickle, Kunhyuk Lee, Seung Yun Heo, Jordan G McCall, Taisong Pan, Liang Wang, Xue Feng, Tae-Il Kim, Jong Kyu Kim, Yuhang Li, Yonggang Huang, Robert W Gereau, Jeong Sook Ha, Michael R Bruchas, John A Rogers
In vivo optogenetics provides unique, powerful capabilities in the dissection of neural circuits implicated in neuropsychiatric disorders. Conventional hardware for such studies, however, physically tethers the experimental animal to an external light source, limiting the range of possible experiments. Emerging wireless options offer important capabilities that avoid some of these limitations, but the current size, bulk, weight, and wireless area of coverage is often disadvantageous. Here, we present a simple but powerful setup based on wireless, near-field power transfer and miniaturized, thin, flexible optoelectronic implants, for complete optical control in a variety of behavioral paradigms...
February 8, 2017: Neuron
https://www.readbyqxmd.com/read/28072999/-features-and-advances-of-morse-taper-connection-in-oral-implant
#16
C L Tang, S K Zhao, C Huang
Dental implants have been widely accepted as a predictable and reliable tool for dental reconstruction with the development of the economy. The design of implant-abutment connections has influence on mechanical properties and biological characteristics of implants. There are two types of implant-abutment connections, the external and the internal connections. Morse taper connection is one of the internal connections and its conical shape creates significant friction via the high propensity of parallelism between the two structures within the joint space...
January 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28072807/occipital-nerve-stimulation-for-refractory-chronic-migraine-results-of-a-long-term-prospective-study
#17
Dolores Rodrigo, Pilar Acin, Pedro Bermejo
BACKGROUND: Refractory chronic migraine affects approximately 4% of the population worldwide and results in severe pain, lifestyle limitations, and decreased quality of life. Occipital nerve stimulation (ONS) refers to the electric stimulation of the distal branches of greater and lesser occipital nerves; the surgical technique has previously been described and has demonstrated efficacy in the treatment of a wide variety of headache disorders. OBJECTIVES: The aim of this study is to evaluate the long-term efficacy and tolerability of ONS for medically intractable chronic migraine...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28042449/stress-and-strain-distribution-in-three-different-mini-dental-implant-designs-using-in-implant-retained-overdenture-a-finite-element-analysis-study
#18
W Aunmeungtong, P Khongkhunthian, P Rungsiyakull
Finite Element Analysis (FEA) has been used for prediction of stress and strain between dental implant components and bone in the implant design process. PURPOSE: Purpose of this study was to characterize and analyze stress and strain distribution occurring in bone and implants and to compare stress and strain of three different implant designs. MATERIALS AND METHODS: Three different mini dental implant designs were included in this study: 1. a mini dental implant with an internal implant-abutment connection (MDIi); 2...
October 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28042437/efficacy-of-a-new-implant-abutment-connection-to-minimize-microbial-contamination-an-in-vitro-study
#19
G E Mancini, A B Gianni', F Cura, Z Ormanier, F Carinci
PURPOSE: The aim of the present study is to evaluate the effectiveness of Ditron implants abutment connection (IAC) to sealing the gap between two pieces. MATERIALS AND METHODS: To identify the efficacy of a new IAC, the passage of genetically modified bacteria across IAC was evaluated. A total of five Ditron Implants were used. All implants were immerged in a bacterial culture for forty-eight hours and then bacteria amount was measured inside and outside IAC with Real-time PCR...
July 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28042434/implant-abutment-leaking-of-replace-conical-connection-nobel-biocare-%C3%A2-implant-system-an-in-vitro-study-of-the-microbiological-penetration-from-external-environment-to-implant-abutment-space
#20
E El Haddad, A B Giannì, G E Mancini, F Cura, F Carinci
PURPOSE: The aim of our study is to value the microbial contamination in the implant-abutment connections (IAC) of a Nobel Replace Conical Connection implant system [Nobel Biocare®, Vimercate (MB), Italy]. MATERIALS AND METHODS: To identify the capability of the implant to protect the internal space from the external environment, the passage of genetically modified bacteria across IAC was evaluated. Four Nobel Replace Conical Connection implants (Nobel Biocare®, Vimercate (MB), Italy) were immerged in a bacterial culture for twenty-four hours and then bacteria amount was measured inside and outside IAC with Real-time PCR...
April 2016: Oral & Implantology
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