Abstract
The design of a portable directional Doppler velocimeter and of purposebuilt probes intended for monitoring blood flow in femorodistal bypass grafts in ambulatory patients are described. The design is based on a continuous-wave Doppler technique with quadrature demodulation. The Doppler unit was interfaced to a ‘personal-stereo’ recorder to store the Doppler signals. The advantages and the limitations of recording flow in ambulatory patients are discussed. Examples of blood flow data collected from femorodistal bypass grafts are given.
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References
Bederosian, S. D. (1960) Normalized design of 90 degree phase-difference networks.IRE Trans.,CT-7, 128–136.
Burnham, S. J., Flanigan, D. P., Groodreau, J. J., Yao, J. S. T. andBergan, J. J. (1980) Ankle pressure changes in distal bypass grafts during knee flexion.Surg.,87, 652–654.
Eimbinder, J. (1970)FET application handbook. Foulsham-Tab Ltd.
Gosling, R. G. and andKing, D. H. (1974) Continuous wave ultrasound as an alternative and complement to x-rays in vascular examinations. InCardiovascular application of ultrasound.Reneman, R. S. (Ed.), North Holland/American Elsevier, Amsterdam, 266–285.
Lloyd, A. G. (1976) 90-degree phase-difference networks are simply designed with a program in Basic.Electron. Des.,24, 90–94.
McShane, M. D., Gazzard, V. M., Cotton, A. M., Williams, J. D., Hames, T. K., Humphries, K. N. andChant, A. D. B. (1988) Blood flow in femorodistal grafts measured with duplex ultrasound. Proc. Conf. on Blood Flow Meas. in Clin. Diagnosis, Biological Engineering Society,4, 75–82.
Schlindwein, F. S., Smith, M. J. andEvans, D. H. (1988) Spectral analysis of Doppler signals and computation of the normalised first moment in real time using a digital signal processor.Med. & Biol. Eng. & Comput.,26, 228–232.
Smallwood, R. H. (1985) Recording Doppler blood flow signals on magnetic tape.Clin. Phys. Physiol. Meas.,6, 357–359.
Sumner, D. S. andStrandness, D. E. (1969) The relation between calf blood flow and ankle blood pressure in patients with intermittent claudication.Surg.,65, 763–771.
Yao, S. T. (1970) Haemodynamic studies in peripheral disease.Br. J. Surg.,57, 761–766.
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Dahnoun, N., Thrush, A.J., Fothergill, J.C. et al. Portable directional ultrasonic Doppler blood velocimeter for ambulatory use. Med. Biol. Eng. Comput. 28, 474–482 (1990). https://doi.org/10.1007/BF02441971
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DOI: https://doi.org/10.1007/BF02441971