1.Measurement of digital blood flow using impedance plethysmography.
Dong Kyun RAH ; Kuek Shun SHIN ; Jae Duk LEW ; Deok Won KIM
Journal of the Korean Society of Plastic and Reconstructive Surgeons 1992;19(4):602-608
No abstract available.
Electric Impedance*
;
Plethysmography, Impedance*
2.Analysis of Hemodynamic Characteristics in End-to-Side Anastomoses with Miller Cuff.
Sang Ho SUH ; Hyung Woon ROH ; Sang Sin YOO ; Dong Ik KIM ; Byung Boong LEE
Journal of the Korean Society for Vascular Surgery 1999;15(1):29-34
The hemodynamic characteristics of the cuff end-to-side anastomosis model are investigated using by the finite volume predictions. The flow rates and the impedance indices through of the cuff anastomosis model are compared with those of the anastomosis model without the cuff. Blood flow increased through the cuff anastomosis model than the standard anastomosis model. The impedance index decreased with the increase of flow rate. The impedance index at a given flow rate is reduced by the increase of anastomosis angle and further reduced by the addition of the cuff. The results suggest that the cuff anastomosis model should be applied for the low Reynolds number flow and/or the small artery anastomosis model.
Arteries
;
Electric Impedance
;
Hemodynamics*
3.A Case of Rumination Documented by Using High-resolution Impedance Manometry.
Journal of Neurogastroenterology and Motility 2013;19(2):259-260
No abstract available.
Electric Impedance
;
Manometry
4.A method for impedance measurements based on EEG acquisition system.
Jilun YE ; Lanlan WEI ; Fan WANG ; Yantao SONG ; Xu ZHANG
Chinese Journal of Medical Instrumentation 2014;38(4):240-250
In the bioelectric measurement, the electrode impedance detection is an important index to the signal quality evaluation and sensor electrode contact condition. In this paper, a method of accurately measuring the electrode impedance based on EEG measurement system was put forward, the method is based on the constant current source excitation signals which are added to the human body, by monitoring the human voltage to measure the electrode impedance. And different reference resistor calibration calculation in different sections was used to reduce the effect of constant current source on the precision of measurement results to improve the measurement accuracy.
Calibration
;
Electric Impedance
;
Electroencephalography
5.Rumination Syndrome: Unknown Pathology Easy to Diagnose With High-resolution Impedance Manometry
Esperanza Martos VIZCAINO ; Fernando Canga RODRIGUEZ-VALCÁRCEL ; Constanza Ciriza DE LOS RÍOS
Journal of Neurogastroenterology and Motility 2018;24(3):503-505
No abstract available.
Electric Impedance
;
Manometry
;
Pathology
7.Letter to the Editor: Normal Reference Plots of the Bioelectrical Impedance Vector for Healthy Korean Adults
Journal of Korean Medical Science 2019;34(40):e274-
No abstract available.
Adult
;
Electric Impedance
;
Humans
8.Research on Constant-current Characteristics of Howland Current Source Used in Bioelectrical Impedance Detection.
Xingjian LIN ; Weijie ZHAO ; Xiaojuan LIU ; Lihua LI
Journal of Biomedical Engineering 2015;32(2):290-294
This study aims to analyze and improve Howland current source circuit and to study the constant current source of alternating current with high output impedance and high stability. A simulation study was carried out on the constant-current characteristics of Howland current source from two aspects of resistance match value and the selection of Op amp parameters, and then the output impedance was analyzed. The simulation experiment showed that when it was with the best matched resistance, the constant-current characteristics of Howland current source was better. Op amp parameters could affect the constant-current characteristics of Howland current source. In Howland current source circuit, the current source after parameter optimization had better output impedance and load capacity. The results showed that there was the best matched resistance in the selection by Howland current source. The Op amp with large broadband, high slew rate and open loop gain, and wide range of power supply voltage is more suitable for the bioelectrical impedance detection circuit.
Electric Impedance
;
Electric Power Supplies
;
Electricity
9.Residual voltage of terms and test method.
Chinese Journal of Medical Instrumentation 2010;34(3):215-217
This paper describes 5 national standards related to the term on the residual voltage with different indicators. Compare the advantages and disadvantages of various test methods. Finally, give suggestions on improving the testing method.
Electric Capacitance
;
Electric Impedance
;
Electricity
;
Reference Standards
10.The Role of Index of Valvular-Arterial Impedance and Systemic Arterial Compliance after Aortic Valve Replacement.
Journal of Cardiovascular Ultrasound 2016;24(3):191-192
No abstract available.
Aortic Valve*
;
Compliance*
;
Electric Impedance*