Achilles reflex test system

Details Achilles reflex test system Achilles reflex test system

1974-09-03

1976-02-17

Michell, Robert W.

Surgery

Truss

Perineal

307232, 328110, 328150, A61B 516

Patent

active

039385035

ABSTRACT:
A system for measuring the duration of the Achilles tendon reflex after the tendon has been tapped by a percussion hammer, the system including an input transducer which converts the reflex extension of the ankle joint to an electric signal which is fed to the input of an amplifier, the output of the amplifier being fed to a peak holder and to a comparator circuit. A portion of the signal from the peak holder is also fed to the comparator circuit which detects a crossover point of the two signals fed to the comparator. The first such crossover occurs during the hammer tap "artefact" and the second such crossover occurs during the relaxation phase of the reflex action. A timing device (such as an integrator) measures the time elapsed between the two crossovers and displays the result. The system also includes a reset switch which is interconnected with the peak holder, the flip flop, and the integrator circuits to reset those circuits and the system further includes an input offset compensator circuit, the output of the input offset compensator circuit being fed to the input circuit of the amplifier to provide sufficient current to reduce or increase the output of the amplifier to zero with zero input signal being fed to the input of the transducer.

REFERENCES:
patent: 3322115 (1967-05-01), Richards
patent: 3475062 (1969-10-01), Crittenden et al.
patent: 3716799 (1973-02-01), Haass et al.
patent: 3734082 (1973-05-01), Rawson
Molcho et al., "Electronic Measurement of Achilles Tendon Reflex" IEEE Trans on Bio-Med Eng., Vol. 17, No. 4, Oct. 1970, pp. 353-355.
Bourne, "Meausrement of Achilles Tendon Reflex," Med. & Biol. Eng., Vol. 10, No. 5, pp. 692-696, 1972.
Tuck, "Improved Measurement of Ach. Tendon Reflex," Med. & Biol. Eng., Mar. 1974, pp. 170-173.
Roy et al., "Simple Linear Pulse to Pulse Cardiotech.", Med. & Biol. Eng. pp. 370-373, May 1974.

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