A portable device for complex electrical bioimpedance information detection
10.3760/cma.j.issn.1673-4181.2014.02.006
- VernacularTitle:便携式生物复阻抗信息检测仪的设计
- Author:
Lei WANG
;
Junqi ZHUO
;
Xu WU
;
Yan WANG
;
Shu ZHAO
;
Hong SHA
- Publication Type:Journal Article
- Keywords:
Bioimpedance;
Muscle injury;
Four-electrode;
AD5933
- From:
International Journal of Biomedical Engineering
2014;37(2):89-92
- CountryChina
- Language:Chinese
-
Abstract:
Objective To develop and test a high precision medical device which allows measurement of bioimpedance in regions below skin surface,and to enable the assessment of strained muscle's situation and instruct patient's rehabilitation exercise.Methods The system was based on the four-electrode impedance measurement mode and designed by using impedance converter network analyzer AD5933 and monolithic operational amplifier AD844.The hardware consisted of an excitation current source,a response signal adjustment circuit,a digital demodulation circuit and a shield driving circuit.This hardware circuit was combined with a LCD screen and a keyboard,which turned it into a portable precision bioimpedance testing device.Results Using an model of three components as test target,a comparison between the device and the Agilent 4294A precision impedance analyzer was presented.In the range of 1 kHz to 100 kHz,the device showed the similar relative error of the complex impedance's modulus and 1 degree absolute error of the complex impedance's phase.The strained muscle's bioelectrical impedance changes in a clinical case during the convalescent were presented and discussed with the results proven to be clinical meaningful.Conclusions The device is accurate,simple and convenient,which is proved qualified on helping doctors to assess the injury states of the strained muscle and to instruct patient's rehabilitation exercise.
