• Journal of Dental Anesthesia and Pain Medicine
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• v.23 no.1
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• pp.45-51
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• 2023

Andersen-Tawil syndrome (ATS) is a rare genetic disease characterized by a triad of episodic flaccid muscle weakness, ventricular arrhythmias, and physical anomalies. ATS patients have various cardiac arrhythmias that can cause sudden death. Implantation of an implantable cardioverter-defibrillator (ICD) is required when life-threatening cardiac arrhythmias do not respond to medical treatment. An 11-year-old girl underwent surgery for an ICD implantation. For general anesthesia in ATS patients, anesthesiologists should focus on the potentially difficult airway, serious cardiac arrhythmias, such as ventricular tachycardia (VT), and delayed recovery from neuromuscular blockade. We followed the difficult airway algorithm, avoided drugs that can precipitate QT prolongation and fatal cardiac arrhythmias, and tried to maintain normoxia, normocarbia, normothermia, normoglycemia, and pain control for prevention of sympathetic stimulation. We report the successful application of general anesthesia for ICD implantation in a pediatric patient with ATS and recurrent VT.

• The Journal of the Acoustical Society of Korea
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• v.24 no.7
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• pp.379-386
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• 2005

Among various kinds of hearing aids which have been developed so far. the conventional air conduction hearing aids have some problems such as the acoustic distortion, an howling effect due to acoustic feedback. Another type of hearing aid. the cochlear implant system can be applied to the profound imparied person. However. it shows the disadvantage that there is no possibility of recovery of the acoustic organ such as ossicle. On the other hand. the implantable middle ear heaving device directly vibratos the ossicular chain and has better sound qualify. good cosmetics for appearance. and wide frequency responses so that it can overcome the defects or the conventional hearing aids. In this paper, a mathematical modeling and a momentum equation derivation of the DET has been performed. For the optimization of the structure dimension generating maximal vibrating force of the DET. the computer simulation using a finite element analysis (FEA) software has been performed. Also. the vibrating transducer has been designed to make the frequency characteristics or the transducer be similar to those of the normal middle ear. Through the experimental results, the measured vibration characteristics of the DET has been evaluated to verify the performance for the application to implantable middle ear hearing devices.

• Journal of Korean Neurosurgical Society
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• v.63 no.5
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• pp.671-672
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• 2020

• Korean Circulation Journal
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• v.54 no.1
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• pp.28-29
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• 2024

• Korean Circulation Journal
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• v.54 no.3
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• pp.156-157
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• 2024

• JSTS:Journal of Semiconductor Technology and Science
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• v.17 no.2
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• pp.294-301
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• 2017

This paper presents a low power ${\Sigma}{\Delta}$ modulator for an implantable chip to acquire a bio-signal such as EEG, DBS, and EMG. In order to reduce a power consumption of the proposed fourth order modulator, two op-amps utilized for the first two integrators are reconfigured to drive the second two integrators. The KT/C noise reduction circuit in the first two integrators is employed to enhance SNR of the modulator. The proposed circuit was fabricated in a 0.18 um CMOS n-well 1 poly 6 metal process with the active chip core area of $900um{\times}800um$ and the power consumption of 830 uW. Measurement results were demonstrated to be SNDR of 76 dB, DR of 77 dB, ENOB of 12.3 bit at the input frequency of 250 Hz and the clock frequency of 256 kHz. FOM1 and FOM2 were measured to be 41 pJ/step and 142.4 dB, respectively.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1998.06a
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• pp.762-766
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• 1998

Mechanical valve is one of the most widely used implantable artificial organs, Since its failure (mechanical failures and thrombosis to name two representative example) means the death of patient, its reliability is very important and early noninvasive detection is essential requirement . This paper will explain the method to detect the thrombosis formation by spectral analysis and neural network. In order quantitatively to distinguish peak of a normal valve from that of a thrombotic valve, a 3 layer backpropagation neural network, which contains 7,000 input nodes, 20 hidden layer and 1output , was employed. The trained neural network can distinguish normal and thrombotic valve with a probability that is higher than 90% . In conclusion, the acoustical spectrum analysis coupled with a neural network algorithm lent itself to the noninvasive monitoring of implanted mechanical valves. This method will be applied to be applied to the performance evaluation of other implantable rtificial organs.

• Transactions on Electrical and Electronic Materials
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• v.15 no.2
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• pp.55-59
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• 2014

An implantable CPW fed monopole antenna embedded into human tissue is proposed for ISM band biomedical applications. The proposed antenna is made compatible for implantation by embedding it in an alumina ceramic substrate (${\Box}_r=9.8$ and thickness=0.65 mm). The proposed antenna covers the ISM band of 2.45 GHz. The radiation parameters, such as return loss, E-Plane, H-Plane, are measured and analyzed, using the method of moments. The proposed antenna has substantial merits over other implanted antennas, like low profile, miniaturization, lower return loss, and better impedance matching and high gain.

• Journal of Biomedical Engineering Research
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• v.29 no.6
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• pp.415-430
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• 2008

The technologies in medical electronic implant(MEI) devices are developing rapidly, and already, there are various kinds of the MEI devices in the current medical equipments market. Recently, the global market scale of MEI devices have been increased about 13% year by year, and the import amount of MEI devices in Korea is increasing rapidly. In the near future, the demands of MEI devices will be magnificently increasing by the continuous development of the biomedical electronics devices which coupled with neural, brain and other organs will bring us to tremendous effects, such as providing new therapeutic solutions to patients, extension and saving human life, and an important clue of medical development. However, the investment of the research and the activity of developments in this field are still very weak in the Korea. Consequently, this paper introduces about the research trends of MEI devices, and technological problems those must be solved, and then concludes with the suggestions in order to be the leading country in this field.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1305-1308
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• 1987

This paper presents a design of an optimized implantable biotelemetry system and the fabrication of custom CMOS LSI for implementing this system. The internal circuits of this system are fabricated on a single silicon chip with a size of $4{\times}5mm^2$. This LSI is designed and fabricated not only to get as small size and low power dissipation as possible, but also to have multiple function. Its main functions are to select one of implanted sensors and to accomplish ON - OFF power switching of an implanted battery by receiving appropriate Command signals and control signals fran external circuits. The internal system which was assembled on a bread-board using fabricated LSI chip is confirmed to work as designed. The total power dissipation of this interal system was $10.12{\mu}W$.