Apparatus for electric stimulation therapy equipment
First Claim
1. An electric stimulation therapy equipment having a plurality of electric stimulation circuits for connection to the body of a patient, said equipment having means for generating electric oscillations in alternating voltage or pulse form and being an equipment of the group consisting of interference stimulation therapy equipment having means for generating said oscillations in alternating current form and having means for differentially phase modulating said oscillations periodically at low frequency for at least a pair of said stimulation circuits, medium frequency alternating current therapy equipment having means for generating electric oscillations in alternating current form and means for low frequency periodic modulation in phase or amplitude of said alternating current oscillations for said electric stimulation circuits and medium frequency pulse current therapy equipment having means for generating electric oscillations in pulse form and having means for low frequency periodic modulation in phase, width or amplitude of pulse form oscillations for said electric stimulation circuits, said equipment further comprising apparatus for output control including:
- a function generator (4) having a first output at which a periodic-cycle low frequency modulating voltage (uM) is generated for modulating said oscillations of said generating means and a second output at which a pulse is made available at a defined time of each cycle period of said modulating voltage;
adjustable frequency division means (13) for division of the frequency of pulses of said second output of said function generator by a selectable whole number 1, 2, 3 . . . n and for supplying high and low output level control voltages in different alternations at least two control outputs, which alternations are switched by frequency divided pulses generated within said frequency-division means;
a plurality of amplitude modulators (14,
15) respectively for the circuits of at least two of said electric stimulation circuits, said modulators having first inputs connected to said electric oscillation generating means and having control inputs respectively connected to said at least two control outputs of said adjustable frequency division means, anda plurality of amplitude modulation adjustment means (17,
18) for respectively applying factors for raising or lowering the amount of amplitude modulation respectively produced in said plurality of amplitude modulators by said respective outputs of said at least two control outputs of said adjustable frequency division means.
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Accused Products
Abstract
In an electric stimulation therapy equipment two or more stimulation current circuits for simultaneous treatment of a patient, for example for muscle training or retraining, the two stimulation circuits have individual modulators for varying the intensity of the stimulation current and a function generator is provided for producing modulation in a cyclical pattern. The function generator also delivers pulses at a defined stage of the modulation cycle which go through a frequency divider with an adjustment for determining if, and by how much, the pulses are to be counted down. The frequency divider output is converted to provide control voltages for the two amplitude modulators for oppositely switching over the amplitude modulators into alternate modes. In the case of an interference current therapy equipment, the function generator controls cycles of phase modulation which produce cycles of relative phase between alternating currents supplied respectively to the two amplitude modulators and the frequency divider outputs alternately reduce the amplitude of one of the two modulators while the other of the two has an unreduced amplitude. In the case of a medium frequency stimulation therapy equipment the continuous output of the function generator provides both modulators with a voltage for producing cycles for stimulation for the patient'"'"'s tissues and the frequency divider output alternately switches off the output of each modulated in turn while the other supplies modulator periods of medium frequency electric stimulation voltage.
33 Citations
10 Claims
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1. An electric stimulation therapy equipment having a plurality of electric stimulation circuits for connection to the body of a patient, said equipment having means for generating electric oscillations in alternating voltage or pulse form and being an equipment of the group consisting of interference stimulation therapy equipment having means for generating said oscillations in alternating current form and having means for differentially phase modulating said oscillations periodically at low frequency for at least a pair of said stimulation circuits, medium frequency alternating current therapy equipment having means for generating electric oscillations in alternating current form and means for low frequency periodic modulation in phase or amplitude of said alternating current oscillations for said electric stimulation circuits and medium frequency pulse current therapy equipment having means for generating electric oscillations in pulse form and having means for low frequency periodic modulation in phase, width or amplitude of pulse form oscillations for said electric stimulation circuits, said equipment further comprising apparatus for output control including:
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a function generator (4) having a first output at which a periodic-cycle low frequency modulating voltage (uM) is generated for modulating said oscillations of said generating means and a second output at which a pulse is made available at a defined time of each cycle period of said modulating voltage; adjustable frequency division means (13) for division of the frequency of pulses of said second output of said function generator by a selectable whole number 1, 2, 3 . . . n and for supplying high and low output level control voltages in different alternations at least two control outputs, which alternations are switched by frequency divided pulses generated within said frequency-division means; a plurality of amplitude modulators (14,
15) respectively for the circuits of at least two of said electric stimulation circuits, said modulators having first inputs connected to said electric oscillation generating means and having control inputs respectively connected to said at least two control outputs of said adjustable frequency division means, anda plurality of amplitude modulation adjustment means (17,
18) for respectively applying factors for raising or lowering the amount of amplitude modulation respectively produced in said plurality of amplitude modulators by said respective outputs of said at least two control outputs of said adjustable frequency division means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification