Abstract
Tissue transplantation is often crucial for victims of accidents. Monitoring the healing process in tissue transplants during the first hours and days is a key factor to successful reconstructive surgery. Visual inspection is the preferred method today with two serious flaws – lack of qualified personnel, and uncertainty in interpretation of observations, which could lead to late discovery of problems in transplanted muscle flaps. Tissue impedance reflects these changes in tissue state as the level of reperfusion and development of edema, which characterize the revivability or resuscitation of the tissue after transplantation. A multi-channel device for monitoring of the tissue impedance at different frequencies is proposed. By definition, bioimpedance is complex parameter of the tissue under examination, and a measure of opposition to the sinusoidal alternating electric current. Correct sinusoidal excitation is computationally and energetically inefficient to use. Limits to available energy resources and processing power in wearable electronics require more robust means, while preserving accuracy of the signal. Also the speed of conventional discrete Fourier transform based algorithms need to be increased.
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References
Grimnes S, Martinsen Ø G (2000) Bioimpedance and Bioelectricity Basics. Academic Press, London
Gabriel C (1996) Compilation of the Dielectric Properties of Body Tissues at RF and Microwave Frequencies, Armstrong Laboratory (AFMC), Final Technical Report for Period 15 December 1994 to 14 December 1995, AL/OE-TR-1996-0037
Hinton A, Sayers B, Advanced Instrumentation for Bioimpedance Measurements, at http://www.solartronanalytical.com/technicalsupport/technicalnotes/ ap04.php
Webster J G (Ed.) (1995) Design of Cardiac Pacemakers. IEEE Press, New York
Meade M L (1989) Lock-in Amplifiers: Principles and Applications. Peregrinus, London
Yúfera A, Leger G, Rodriguez-Villegas E O, Muñoz J M, Rueda Ivorra A A, Gomez R, Noguera N, Aguiló J (2002) An integrated circuit for tissue impedance measure, in Proc. of the IEEE EMBS Special Topic Conference on Microtechnologies in Medicine and Biology, 2002, pp. 88-93.
Min M, Kink A, Land R, Parve T, Rätsep I (2004) Modification of pulse wave signals in electrical bioimpedance analyzer for implantable medical devices, Proc. IEEE EMBS 26 International Conference, San Francisco, California, 2004, pp 2263-2266.
Pallas-Areny R, Webster J G (1993) Bioelectric Impedance Measurements Using Synchronous Sampling. IEEE Trans Biomed Eng 40(8):824-828
Jennings D, Schneider I D (2001) Front-end architecture for a multifrequency electrical impedance tomography system. Med Biol Eng Comput 39:368-374
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© 2007 Springer-Verlag Berlin Heidelberg
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Land, R. et al. (2007). An energy efficient wearable tissue monitor. In: Scharfetter, H., Merwa, R. (eds) 13th International Conference on Electrical Bioimpedance and the 8th Conference on Electrical Impedance Tomography. IFMBE Proceedings, vol 17. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73841-1_64
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DOI: https://doi.org/10.1007/978-3-540-73841-1_64
Publisher Name: Springer, Berlin, Heidelberg
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