WO2001051122A1 - Electro therapy method and apparatus - Google Patents
Electro therapy method and apparatus Download PDFInfo
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- WO2001051122A1 WO2001051122A1 PCT/US2001/000572 US0100572W WO0151122A1 WO 2001051122 A1 WO2001051122 A1 WO 2001051122A1 US 0100572 W US0100572 W US 0100572W WO 0151122 A1 WO0151122 A1 WO 0151122A1
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- patient
- signals
- frequency
- pain
- feed
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/36014—External stimulators, e.g. with patch electrodes
- A61N1/36021—External stimulators, e.g. with patch electrodes for treatment of pain
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/326—Applying electric currents by contact electrodes alternating or intermittent currents for promoting growth of cells, e.g. bone cells
Definitions
- This invention relates to an electro-therapy method and apparatus and more particularly to a method and apparatus for relieving pain arising from temporary or chronic conditions or during or after surgery.
- Nemec in US patent 2,622,601 issued on December 23, 1952 disclosed one of the earliest electro therapy apparatuses and method.
- the Nemec system disclosed an apparatus comprising at least two means for producing alternating currents of frequencies between 1000 and 10,000 cycles with each of means connected with a separate pair of electrodes. The difference frequency between the means was made less than 100 cycles.
- the electrodes were placed upon the patient such that the two currents would intersect at a proposed therapeutic site. The basic concept was that the higher frequencies would be transmitted, but the low frequency need for therapeutic action would occur only at the common transmission point.
- Nemec in patent number 4,023,574 issued May 17, 1977 disclosed three separate pairs of electrodes are attached to a body part to be treated, spaced apart around said part of the body.
- a primary alternating electrical current having a primary frequency of between 100 Hz and 100,000 Hz is passed between one of the electrode pairs.
- a similar second alternating electrical current having a secondary frequency in the same range as the primary frequency but differing by between 50 Hz and 100 Hz from the primary frequency is passed between another of the pairs of electrodes.
- a tertiary alternating current is passed between the third pair of electrodes and has a tertiary frequency differing by at most 1 Hz from the frequency of either the primary current, the secondary current, or the arithmetic means of the frequency of these two currents.
- Hunsjurgens' patent 3,774,620 issued on November 27, 1973 disclosed an electro-medicinal apparatus for use in interference current therapy.
- the apparatus has at least two circuits that act on the patient through electrodes, the currents producing s stimulus active interference on a target area on the patient by superimposing the two or more currents, which by themselves have no stimulating effect, the currents differing from each other by a low frequency value.
- a particular feature of the apparatus is that the circuits produce an optimum interference at the treatment area and include a current strength-regulating member, which can operate during treatment.
- the difference voltage is produced separately for each circuit and used for the amplification control on the corresponding of the amplifiers, and the voltage is so polarized that an increase in patient current resulting in a decrease of the amplification and an increase in the joint voltage resulting in an increase ofthe amplification.
- Nawracaj et al. disclosed in their patent number 4,071,033 issued on January 31, 1978 that a master oscillator, whose output is split and applied to two frequency dividers that divide the frequency by different numbers, initiates stimuli.
- the two frequencies thus derived are applied to wave shapers to provide a desired waveform such as a half sine wave, and also each signal is further divided by a common number.
- the two signals are then amplified, and applied to the body through a probe whose contacts are arranged so that the two stimuli currents are orthogonal to each other.
- the two high frequency signals heterodyne within the human muscle to produce a single low frequency stimuli, useful for the production of muscle contraction, hyperemia, electro analgesia and muscle relaxation.
- Masaki disclosed in patent number 4,960,124 issued on October 2, 1990 a apparatus for low-frequency electrotherapy wherein the output current of a low-frequency oscillator is applied to the subject's body through a pair of electrodes placed on the subject's body, comprising a first oscillator circuit that generates a low- frequency square wave voltage when the load is in connection with the electrode pair; and a second oscillator circuit that generates a therapeutic voltage when the output voltage ofthe first oscillator circuit is not zero.
- Matthews' patent 5,269,304 issued on December 14, 1993 discloses an electro-therapy apparatus that includes at least two electrodes adapted to feed oscillating current to selected sites on or beneath the epidermal or mucous surface remote from a treatment site.
- a common return electrode is provided at the treatment site that is subjected to the sum ofthe currents from the two feed electrodes.
- the feed electrodes may be contact feed electrodes or capacitive feed electrodes.
- the feed electrodes may operate at different frequencies so that the treatment site is stimulated by the beat frequency. This may be at or about 80 or 130 Hz, if an anaesthetizing effect is required.
- Reiss' patent 5,324,317 issued on June 28, 1994 discloses an interferential stimulator for applying two medium frequency alternating currents of slightly differing frequencies to the body of a living being so that they cross and interact to produce a low frequency therapeutic current at a selected point.
- a fixed frequency is generated and applied to the skin through a first electrode pair.
- a second frequency, differing from the first by from about 1 to 150Hz is applied through a second electrode pair.
- the electrodes are arranged to deliver a localized stimulation.
- the heterodyne process for specific point stimulation produces a low frequency beat or pulse.
- the stimulator may be operated in any of several modes. First, constant stimulation may be applied at fixed frequency difference between electrodes.
- the frequency difference can be decreased abruptly and returned to the original frequency difference over about 1 second.
- the frequency difference can be decreased abruptly about 50% and returned over a typically 8 second period.
- a gradual about 50% drop in frequency difference may be accomplished gradually and returned over typically a 10 second period.
- An electro-therapy apparatus and method for providing therapeutic electric current to a treatment site of a patient having means for providing two oscillating or pulsing electric alternating currents, of frequencies which differ from each other by as little as 1 Hz and up to about 250 Hz, but each being of frequency at least about 1 KHz.
- the apparatus and method requires only one feed electrode adapted to feed the electric currents to selected feed sites on or beneath the epidermal or mucous surface of the patient opposite the source of pain, and only one return electrode adapted to be positioned on or beneath the epidermal or mucous surface of the patient, directly over or next to the source of pain.
- the method of electro therapy includes providing a generator that generates two oscillating or pulsing electric alternating currents, of frequencies which differ from each other by as little as 1 Hz and up to about 250 Hz, but each being of frequency at least about 1 KHz.
- the method also includes providing a single feed electrode and a return electrode placed on or beneath the epidermal or muscular surface of a patient coupled to the generator feeding via the feed electrode two or more oscillating or complex morphology electric currents to a patient, with respective selected feed sites placed opposite one another on the patient's body with a pain site located on a line vector in between the electrode pads with the line vector perpendicular to each skin surface on which the pads reside, the currents each being of frequency at least about 1 KHz and differing as little as 1 Hz from each other by up to about 250 Hz.
- a non-linear action of nerve fiber membranes causes a mixing ofthe two independent high frequency signals in a volume of tissue surrounding and beneath a pain site pad along an axis between a pain site pad and a an opposite pad to produce a therapeutic effect.
- the mixing yields a distribution of synthesized sum and difference frequencies among which is a therapeutic low frequency equivalent to a beat frequency ofthe signals.
- a feedback control system for patient electro therapy includes a generator for outputting a pair of therapeutic currents feeding a single feed electrode and a return electrode.
- a measurement subsystem determines an impedance of the patient and a control mechanism controlling an output level of said generator.
- Electro-therapy electrodes for providing therapeutic electric current to a treatment site of a patient are coupled to a generator providing two oscillating or pulsing electric alternating currents, of frequencies which differ from each other by as little as 1 Hz and up to about 250 Hz, but each being of frequency at least about 1 KHz.
- the electrodes include only one feed electrode adapted to feed said electric currents to selected feed sites on or beneath the epidennal or mucous membrane surface ofthe patient and a return electrode adapted to be positioned on or beneath the epidermal or mucous surface ofthe patient, locally to said treatment site.
- Figure 1A and IB illustrate the hyperpolarization mechanism of pain reduction
- Figure 2 illustrates the gate control mechanism of pain reduction
- Figure 3 illustrates an opposite pad placement for shoulder pain
- Figure 4 illustrates a pain site pad placement for shoulder pain
- Figure 5 illustrates a frequency generation portion of an electro- therapeutical device
- Figure 6 illustrates an output portion of an electro-therapeutic apparatus
- Figure 8 illustrates coupling of outputs of an electro-therapeutic apparatus to one or more electrodes
- Figure 9 illustrates the power system of an electro-therapeutic apparatus.
- Figure 10 illustrates a block diagram of a feedback system for controlling the output ofthe electro-therapeutical device
- Figure 11 illustrates a software flow diagram of a feedback system for controlling the output of electro-therapeutical device.
- Figure 12 illustrates a waveform representing the current flow form the device
- Figure 13 illustrates a waveform of the morphology of the effective signal
- Figure 14 illustrates a waveform of the magnitude of the peak current ofthe difference signals developed within the human body
- Figure 15 illustrates a waveform ofthe sum signal derived in the same setup as Figure 14.
- the embodiment disclosed introduces two high frequency electronic wave-forms ("Feed Signals") into the body non-invasively through a single proprietary disposable pad placed on the skin opposite the pain site ("Opposite Pad") as shown in Figure 3.
- the Feed Signals pass through the body to a second proprietary disposable pad at the treatment site (“Pain Site Pad”) as shown in Figure 4.
- the Feed Signals are exponentially multiplied by materials within the body giving rise to a low frequency component, the beat frequency, in the form of an electric field within the volume of tissue defined by the geometry ofthe body between the electrodes.
- the size of the volume of tissue affected can be changed and is dependent upon electrode placement, geometry and materials, as well as the amplitude ofthe Feed Signal.
- the two electrode pads are placed opposite one another on the patient's body with the pain site located on a line vector in between the electrode pads.
- Prior electro-therapy technology applications require placement ofthe electrode pads (typically two or more) adjacent and in the same plane as the pain site but not in an opposing placement.
- the ratio of the area of the pad sizes used in conjunction with one another is important in the shaping of the electric field gradient and in determining the current density through the target volume.
- the ratio ofthe area ofthe Opposite Pad to the area of the Pain Site Pad must be at least 2:1.
- the pad size ratio depends upon the application and location of the pads on the body.
- a further explanation of the therapeutic Hype ⁇ olarization mechanism is that the resulting beat frequency, its signal mo ⁇ hology and current densities within the volume of tissue around and below the return electrode, causes an alteration in the nerve cell membrane's sodium/potassium ion concentrations or ion exchange kinetics. As a result, the charge polarity of the nerve cell wall is prevented from changing and is therefore unable to transmit pain impulses.
- the difference signal does not affect the sensory fibers, however, after a prolonged period of exposure to the difference signal and/or after exposure to the difference signal at high amplitudes, some sensory anesthesia can be achieved.
- the resulting difference signal does not affect the transmission of touch, vibration, pressure or location awareness (proprioception). As a result, while the pain signal is blocked, patients still have sensory awareness and little numbness.
- Gate Control focuses on interactions of four classes of neurons in the dorsal horn ofthe spinal cord as shown in Figure 2: (1) C fibers which are unmyelinated, (2) AD /AD fibers which are myelinated, (3) projection neurons whose activity results in the transmission of pain information, and (4) inhibitory intemeurons which inhibit the projection neuron, thus reducing the transmission of pain information.
- the projection neuron is directly activated by both AD/AD and C fibers.
- the AD/AD fibers activate the inhibitory interneuron.
- the inhibitory interneuron is activated and prevents the projection neuron from transmitting pain information to the brain.
- the C fiber is left in a state analogous to an open electrical circuit so that transmission ofthe sensation of pain is suppressed.
- a series of sinusoidal Feed Signals are generated and applied either individually or electronically summed to a patient via a single feed electrode. These Feed Signals or signal appear at the return electrode as a series of signals representing the sum, difference and original input frequencies.
- the potential difference between the inside and outside of a nerve membrane is around -75 millivolts. Due to the potential difference and differences in ion mobility, activity and half-cell electrical potential, a nerve cell membrane can be modeled as a weakly rectifying junction. Weakly is used to describe the nerve cell membrane's performance because of large deviat ns in its behavior from an ideal diode.
- Deviations in the nerve cell membrane's behavior arise due to shunt capacitance and leakage conductivity arising from membrane's aqueous ion environment.
- the membrane is still capable of exponential response to an electrical signal.
- the membrane acts as a device causing mixing of the Feed Signals, and yields a distribution of synthesized sum and difference frequencies among which is a therapeutic low frequency equivalent to a beat frequency of the Feed Signals.
- the Feed Signals that are generated by the oscillators in the electrotherapeutic apparatus, form within the body, a complex combination ofthe sum and differences of such signals.
- the sum signals are at a frequency far from the capture range or physiological effect range (physiological effect range « lKHz) of the nerve membranes of nerve fibers that control pain signal transmission.
- the difference signal (Beat Frequency signal), when the initial Feed Signal frequencies are set properly, is within the therapeutic range (1Hz to 250Hz.) and interacts with nerve membranes at the rate of this low frequency beat.
- Depolarization of afferent A-fibers is believed to switch-on an inhibitory neuron that inhibits the action of a projection neuron at the dorsal horn of the spine. This effectively disconnects the pain receptors (C fibers) from the brain.
- This is known as the gate control mechanism and is well known and accepted by the neuroelectrophysiology community.
- the driven polarization/depolarization afforded by the electro-therapeutic apparatus saturates the nerve's ability to transmit information to the spine. The exact effect is not absolutely known.
- the effect of the signal on pain is the perception of numbness or dulling without loss of heat or mechanical response to external stimuli.
- the method has an effect that appears to last longer than the time of the application of the electrical fields.
- Empirical evidence suggests the Primary Residual Effect can last for up to 60 minutes before nerve membrane cells can begin changing polarity again and allow transmission of some pain signals.
- the Secondary Residual Effect involves either a refractory mechanism involving the membrane itself or the local release of endo ⁇ hins, enkaphlins or other opiate-like analogs and empirical evidence has shown this effect to last up to 24 hours.
- Both Primary Residual and Secondary Residual effects described above, affords the electrotherapeutic apparatus some additional capabilities.
- these capabilities include large area pain control. If one properly multiplexes or switches between several feed and/or return electrodes at a rate of 10 - 50 Hz, the flywheel effect will fill in the gap when a particular area is not under the influence of the electric field.
- This proper multiplexing includes the timing corresponding to the zero crossing of the sine wave so as not to induce spikes in the signals due to abrupt current collapse in the output transformers or inductor-based filter network (if they are used). This allows the apparatus to synthesize a large effective area without the need for a much more complex apparatus or physically moving the electrodes which would cause the area not under the field's influence to feel sensation again.
- the electro-therapeutic apparatus disclosed is unique in that it can mimic multi-electrode (more than two or a pair) apparatuses with much greater precision and control, and additionally and more importantly, can interrupt the transmission of a pain signal, or more generally, place an AC signal within the body using only one feed electrode and one return electrode.
- the electro-therapeutic system is either turning off a particular pain fiber, proximal to the treatment site, or inhibiting pain signal transmission via the stimulation of inhibitory neurons that control pain transmission to the dorsal horn of the spine and brain.
- all pain signals travel first through the dorsal horn ofthe spine and then onto the brain.
- TENS type apparatuses in use rely on either pulse operation or multiple signal application to affect nerve fibers.
- a unipolar or bipolar pulse is applied to the target area. These pulses are of short duration and can cause undesired stimulation of other tissues especially muscle.
- Multiple signal application requires that two or more feed (signal) electrodes be placed at different points on the body so that the resulting electric field and current can be summed at the return electrode thereby causing the desired effect.
- TENS type apparatuses suffer from the need for multiple electrodes and power amplifiers for each signal channel. As the number of signals increases, so do the demands on electrode placement and circuit design.
- the disclosed electrotherapeutic apparatus is an "instant system" because the sinusoidal signals of the desired frequencies are electronically summed in the power amplifier stage. If desired, the signals can be individually amplified and the resulting high-level signals summed at the pad(s) through load leveling resistors.
- the paths can vary greatly, altering the fidelity and bioelectric characteristics ofthe resultant signal.
- current for each feed signal can differ widely due to variations in path length and the chemical/anatomical environment along such a path.
- Degradation of individual feed signals can also be caused by the need for multiple signal electrodes.
- No electrode/body interface is perfect.
- Each electrode attachment introduces impedance that differs from place-to-place where the attachments take place. This is due to a myriad of factors such as skin moisture/ion content, skin mechanical condition and surface shape, site prep and electrode manufacturing variability.
- the use of a single signal feed causes the outcome of these variables to impact all the desired signals in parallel. This effectively nullifies the problems tha.t arise from the differential effects that arise when multiple variables impact multiple signals independently.
- the electro-therapeutic apparatus Since the electro-therapeutic apparatus generates a set of sine waves or an admixture of sine waves of arbitrary frequency, its concept can be extended to generate an arbitrary waveform of any intensity and harmonic content.
- the arbitrary waveform generation (see also discussion of direct digital synthesis) is a consequence of the Fourier series where a subset of a basis set of sine waves can be algebraically summed to generate any waveform. This technique can be used to tailor a pulse that can be useful in pacemaker or cardioverting applications.
- the feedback network consists of two functional parts: 1) a circuit (Hardware), that monitors the patient-applied current and voltage and 2) software that determines if the values measured require an output level change (Software).
- the parameter derived from the current and voltage is the impedance across the patient-applied electrodes.
- the Feed Signals are summed at a low level before the power amplifier.
- An alternative would be to send each Feed Signal separately from the output(s) of the power amplifier(s) and cause them to be mixed at the pad itself.
- the electrotherapeutic apparatus allows the amplitude of the Feed
- Signals to be adjustable and controlled by the patient so that treatment level and comfort can be customized to each individual patient.
- the electrotherapeutic apparatus also has an optional automatic mode setting that memorizes the amplitude settings ofthe Feed Signals during the course of the entire treatment.
- the apparatus stores this information in memory for a given treatment location and creates an auto Feed Signal profile for the patient.
- the patient then has the option during future treatments to run the electrotherapeutic apparatus in an automatic mode so that they do not have to manually increase the amplitude ofthe Feed Signals.
- the auto profile would be updated with each new set of data points that were manually generated.
- the pads that connect the instrument to the body are of a certain conductive material that allows propagation of the physiologically high frequency signal.
- the connection between the lead wire and the electrodes is of a unique low profile design that allows for easy connection and comfortable use under clothing.
- the electro-therapeutic apparatus can be useful in any situation where either an AC field, within a physiologically active frequency range, is needed (pacemakers, part of pain control, local healing, bone growth, cartilage regeneration) or where information transmission, i.e. sensory prosthetics, would be useful (vision, sound, touch).
- Figures 5 - 9 illustrate the structure of an electro-therapeutic apparatus (Apparatus) as discussed above.
- Figure 5 illustrates the control and generation ofthe frequencies used in the Apparatus.
- a high integration micro controller 12 supervises the entire operation of the apparatus.
- the microcontroller 12 is responsible for inte ⁇ reting operator commands and for displaying system status on the LCD display panel 14. Additionally, the processor controls the frequencies of the signal sources, their levels and compensates for any variation in system load.
- the micro controller uses feedback to control signal levels by comparing the immediate electrical load to previously "learned" characteristic rules for a particular patient.
- the micro controller receives a clock signal from a clock generator 16.
- the micro controller 12 receives operator instructions from an Operator Keypad 18.
- the micro controller provides instructions to various portions of the signal generation system.
- the signal system generates two signals, signal 1 44 and signal 2 46.
- the reference frequency for the synthesis of the signals ultimately applied to the patient is derived from the micro controller clock 16.
- This clock source is a crystal oscillator with an error of 50 ppm and slow aging characteristics.
- An exemplary clock frequency is 6 mHz.
- one frequency is fixed to the output of a divider chain 20 of the system clock 16.
- the clock 16 is coupled to the input of the divider chain 20.
- the derived frequency can be set anywhere within the apparatus's exemplary operation frequency range of 1Hz to 150KHz.
- the output of divider 20 is coupled to a precision limiter 24 to generate a square wave of a limited value.
- the output of precision limiter 24 is designated Signal 1 44 and is coupled the output circuitry described in Figure 6 and 7 below.
- Outputs of the clock 16 and micro controller 12 are also coupled to elements of circuitry that generates any frequency between 2Hz and 200 KHz 42.
- the clock signal is coupled to a "divide by n PLL reference" block 22 that is coupled a first input a "phase lock loop block” 26.
- the phase lock loop 26 is controlled by two loops.
- the first loop comprises an output coupled to the switched capacitor 5th order DC corrected low pass filter 28 which has its output coupled to the phase locked loop 26.
- a second loop comprises an oscillator output of phase locked loop 26 which in turn is coupled to a combination of a pre-divider 34, a programmable divide by 2 to 65535 divider 32 and a post divider 30 each of which are coupled to an output of microprocessor 12.
- the output of post divider 32 is coupled to a feedback input of the phase lock loop.
- This subsystem 42 generates any frequency between 2 Hz and 200Khz with a 1 Hz resolution.
- the Oscillator output of phase lock loop 26 is coupled to a divide by two block 36 providing a filter clock and a combination of a divide by 100 block 38 and precision limiter 40.
- the precision limiter 40 provides a limited signal output 46 similar to Signal 1 44. In situations where a variable range for Signal 2 is not necessary a divider system as outlined for Signal 1 can be substituted for the PLL network. This option necessitates the use of a non-standard custom crystal for the main clock so that the proper frequency separation can be maintained.
- the second method used to develop an arbitrary waveform mo ⁇ hology involves the method of Direct-Digital-Synthesis (DDS). With this subsystem the above phase-locked-loop, frequency divider and filter sections discussed below, are not used.
- the DDS instead involves downloading to the Apparatus a binary representation of the desired waveform from a host computer that calculates these coefficients as a table. These values transferred to the Apparatus's memory space are saved in EEPROM and are used as a lookup table to drive, at a rate determined by a micro controller derived clock a high-speed precision digital-analog controller (DAC).
- DDS Direct-Digital-Synthesis
- Figure 7 illustrates a sub-system for converting Signal 1 and Signal 2 to sine wave signals.
- Signal 1 and Signal 2 are initially logic level square-type waves. These signals are limited to 0.6V amplitude by the transistor limiters 24 and 40 shown in Figure 5.
- the outputs of these limiters are applied independently to high order low pass filters (switched capacitor type 2 nd or 8 th order depending on required signal distortion levels) 52 and 54.
- the filter clock output of "divider by 2" 36 is coupled to each ofthe filters. These filters suppress the higher order harmonics present in the limited square waves leaving a low distortion sine wave at the reference frequencies.
- These sinusoidal signals are amplified and applied to electronic attenuators or programmable amplifiers 56 and 58 (under microprocessor 12 control) to control the level ofthe signal applied to the power amp stage, discussed below, and ultimately to the patient.
- the signals from above are buffered 60 and 62 and applied to a power gain stage (68 or 70).
- the power stage consists of one or more amplifiers capable of supplying a wide range of voltages into any physiological and electrode load over the frequency ranges used. Depending on the desired level of system integration and/or portability required, this amplifier stage can be either of the linear Classes A or ABi or the nonlinear switching Class D type.
- a high power operational amplifier is operated in either a ground-referenced mode or in a bridge configuration. In the bridge configuration the load is connected differentially to the outputs of two power amplifiers that operate 180 degrees out-of phase with respect to one another. In either configuration the amplifier's DC offset is nulled by a servo correction amplifier.
- the amplifiers are also setup as AC coupled amplifiers essentially no DC current flows to the load. In the ground referenced mode higher output voltages are developed by passing the amplifiers output to a high efficiency transformer(s). In the bridge topology the amplifiers, when in balance, generate essentially no net DC current. Additionally, this composite amplifier can swing an output level twice that of the individual amplifiers. This, amplifier topology will, in most circumstances, eliminate the need for an output transformer(s) and its weight, circuit board real estate requirements and power losses. Factors very important to a small, portable and lower battery current embodiment ofthe Apparatus.
- the second class of amplifiers which also improves performance in a portable system, is that of Class-D.
- the information derived as to patient impedance load or power delivered is compared by the microprocessor to reference values taken during system setup. This comparison allows the system to vary the amplitude of the output signals to eliminate any load induced variations in the perceived signal levels thereby affording greater patient comfort.
- Figure 8 illustrates the coupling of Sine wave 1 and Sine wave 2 to the electrodes when the apparatus is constructed around ground reference (local Apparatus ground) linear power amplifiers.
- the sine wave signal is coupled from the junction of current monitor 76 or 78 and voltage monitor 80 or 82 to a DC isolation capacitor 88 or 92. This capacitor removes any remaining DC component on the sine wave signal.
- the sine wave signal is coupled to transformer 90 or 94.
- the output of the transformer 90 is coupled to the patient electrodes.
- One output of each transformer 96 or 100 is coupled to a large signal electrode and the other to a small return electrode 98 or 102.
- the transformer provides voltage gain and patient/apparatus isolation. With bridged amplifiers or in Class D operation no such transformers are required.
- a feedback system is illustrated in Figure 14 as 200.
- the current level through the patient is monitored by a precision 5 ohm resistor 202.
- a voltage is developed by the current through this resistor and is differentially detected by an amplifier 204.
- This signal level is further amplified by gain block 204.
- the voltage across the electrodes 206 is sampled by a buffered attenuator 208 to set its value to within the range of the Analog-to-Digital (ADC) circuit.
- An analog multiplexer 210 is used to select either the current or voltage representations for digitization. This selection is under the control of the CPU.
- the output of the multiplexer is applied to a precision RMS to DC converter 212 whose output is a DC level approximately equal to the RMS value of the applied signal.
- the output from 212 is digitized to 12 bits by the ADC 214 and passed to the CPU.
- the same digital attenuator that is used to set the output level from the patient adjustable control makes any changes to the output level that
- the second section of the feedback control network is the software controller 220.
- This collection of routines determines if the measured impedances require any change to the device's output level to maintain patient comfort.
- the flow chart in Figure 11 outlines the logic of the software function.
- the software waits until the output level is of sufficient amplitude (about 3 % of full power) 224 to assure accurate measurement ofthe voltage and current across and through the patient.
- the software collects 16 samples of both the current and voltage 224 and performs an averaging of the derived impedances. Previous experiments have helped to define a set of rules as to what ranges of impedance variability can be expected when the patient load can cause an alteration is applied field that can cause an unpleasant sensation for the patient.
- the rules encompass the range of impedance values that can be expected when the patient load tends toward that initially encountered. These rules are used to predict what impedance range can be expected when the device output is altered via the patient adjustable control. If the impedance value is not within those set by the rules the output is reduced by an amount dictated by another set of rules derived for the particular output level currently being used. The effect is a reduction in the applied field and the elimination of any unpleasant sensations. If the impedance values at this new field level trend back to within the stored "normal" range the output is restored to its value held previous to the impedance change. The rate at which takes place is set by another set of rules that are derived as a function of the absolute difference between the desired output and the feedback-set output.
- Two 12- volt batteries in series are currently used to supply differential input power 300 for the system.
- the 7-volt feed is developed by a high efficiency step-down switching regulator and is used to supply linear regulators that power low voltage subsystems such as the micro controller and low voltage analog components 302.
- the 12 volts is also inverted and regulated to supply the negative low voltage used by some analog components 304.
- the 12-volt supply is used directly for some higher voltage analog components and is also stepped up and or inverted to supply up to +/- 50 volts for the power stage 306.
- the battery pack is recharged by a DC wall pack supply 120 that supplies a switching-type recharging circuit 308.
- a wearable apparatus preferably hand held or attached to the belt or other location on the body.
- the design ofthe apparatus is such that one embodiment of the apparatus is easily packaged in an apparatus that the patient can use in a wearable/portable manner.
- Such applications for an ambulatory apparatus include use while walking, working, sitting at a desk; use at home, while watching TV, sitting in a car, or in a manner prescribed by the physician.
- the programming capability permits the company or the physician to program the portable apparatus to fit the patient's needs. This may include an elapsed timer within the apparatus, to limit the patient's use if that is desirable from a medical point of view.
- muscle tension holds at a fixed level. This tension acts to hold a muscle in stretch thereby possibly conditioning it. This effect is similar to isometric exercise where a fixed load is presented to a muscle group held in place. This effect also helps explain why the current embodiment of the invention causes little or no uncomfortable muscle twitch as seen with pulse-type (TENS) devices: It is quite likely that some combination of these three mechanisms all produce the efficacious results acquired in clinical studies.
- TENS pulse-type
- Figures 12 - 15 are various waveforms illustrating features of the device.
- Figure 12 illustrates a waveform representing the current flow form the device in a simple dual sine wave mode into a 1.2K ohm resistive load.
- Figure 13 illustrates a waveform of the a recording of the mixed signal after it is passed through a high speed filter, followed by a 1 ⁇ fd. capacitor acting as a filter. This simulates the mo ⁇ hology ofthe effective signal.
- Figure 14 illustrates a waveform of the magnitude of the peak current of the difference signals developed within the human body.
- the current measured is from one electrode placed at the lowest abdominal quadrant and the other is placed 10 cm left of L5 on the back in an adult male subject.
- the second harmonic at 244 Hz is depressed by -45db relative to the primary therapeutic signal at 122 Hz.
- Figure 15 illustrates a waveform of the sum signal derived in the same setup as Figure 14. As can be seen the signal frequency is well separated from the physiologically important frequency range.
- Benefits ofthe Pain Control Apparatus include: a. Significant non-invasive pain control; b. Dramatic increase in range of motion; c. Reduction in the dosages of or elimination of the need for mo ⁇ hine and other narcotics; d. Residual pain control and increased range of motion for up to 24 hours; e. No known deleterious side effects; f. Control by the patient of their own comfort level; g. Reduction of risk by eliminating potential chemical allergic reactions and drug interaction problems; h. Tactile sensory apparatus and awareness remains intact; and i. Improvement in patient's quality of life.
- pain applications for the system including, but not limited to, acute and traumatic pain, chronic and arthritic pain, surgical pain, post- surgical pain, and cancer pain.
- Specific locations on the body which can be treated include: face, jaw, neck, back, shoulders, hips, arms, elbows, wrists, hands, fingers, legs, knees, ankles, feet, toes.
- the system can be used to provide local anesthesia for skin surgery, wart removal, electrolysis, shaving, application of tattoos and other dermatological procedures.
- the electro-therapeutic apparatus can be used to deliver a precise electrical field non-invasively ofthe proper frequency content to a targeted region. This action would take place with better control of the electrochemically driven reactions around the targeted region.
- the system can be used to accelerate osseointegration non-invasively, i.e. reduce the time required for bone to grow into and bond with prosthetic apparatuses including dental implants, knees, and hips while simultaneously reducing postoperative pain.
- the apparatus also has the potential to accelerate the healing of broken bones non-invasively.
- the disclosed technology allows information to be delivered into a volume of tissue including the cochlea with a DC-suppressed AC signal that significantly lessens the potential for nerve damage.
- the use of a PLL system allows the apparatus to have one channel modulated while another is fixed (FM modulation).
- the frequency modulation of the nth reference frequency allows the signal or envelope to convey information into the body of the patient.
- the use of a slowly varying difference signal may lessen any effect of habituation if it is found during chronic use.
- Information exchange could be another big factor in the utility of the apparatus.
- cochlea implants for deafness rely on pulse stimulation to convey auditory information to the brain. These pulses, even with the use of DC blocking, still have a considerable DC component.
- the disclosed apparatus is a suppressed-DC AC signal generator whose resultant field should not have little or no net electrochemical effects.
- One way to affect the auditory informational transfer is to hold one frequency fixed and use the ambient audio level to vary the input level to the phase locked loop voltage control oscillator. The resulting signal would contain the auditory information. Theoretically, the nerves within the cochlea could operate on the signals and extract from the modulated beat the information that is a representation of an electrically converted acoustical field.
- Accelerated and Targeted Drug Delivery A consequence of the disclosed technology is that it causes increased blood flow in the volume of tissue at and beneath the treatment site.
- This technology might be employed as an adjunct to a chemical drug delivery system to accelerate and target the delivery of certain drugs into deep tissue.
- Embodiments of the present invention can be embodied in the form of computer- implemented processes and apparatuses for practicing those processes.
- the present invention can also be embodied in the form of computer program code containing instructions embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or any other computer-readable storage medium, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the invention.
- the present invention can also be embodied in the form of computer program code, for example, whether stored in a storage medium, loaded into and/or executed by a computer, or transmitted over some transmission medium, such as over electrical wiring or cabling, through fiber optics, or via electromagnetic radiation, wherein, when the computer program code is loaded into and executed by a computer, the computer becomes an apparatus for practicing the invention.
- the computer program code segments configure the microprocessor to create specific logic circuits.
Abstract
Description
Claims
Priority Applications (9)
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MXPA02006658A MXPA02006658A (en) | 2000-01-07 | 2001-01-08 | Electro therapy method and apparatus. |
AT01901873T ATE302634T1 (en) | 2000-01-07 | 2001-01-08 | DEVICE FOR ELECTROTHERAPY |
JP2001551542A JP2003532453A (en) | 2000-01-07 | 2001-01-08 | Electric treatment method and electric treatment device |
EP01901873A EP1246665B1 (en) | 2000-01-07 | 2001-01-08 | Electrotherapy apparatus |
CA002396334A CA2396334C (en) | 2000-01-07 | 2001-01-08 | Electro therapy method and apparatus |
AU27727/01A AU776786B2 (en) | 2000-01-07 | 2001-01-08 | Electro therapy method and apparatus |
NO20023264A NO20023264L (en) | 2000-01-07 | 2002-07-05 | Electrotherapy method and apparatus |
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- 2001-01-08 ES ES01901873T patent/ES2248274T3/en not_active Expired - Lifetime
- 2001-01-08 US US09/756,999 patent/US6584358B2/en not_active Expired - Lifetime
- 2001-01-08 CA CA002396334A patent/CA2396334C/en not_active Expired - Fee Related
- 2001-01-08 AU AU27727/01A patent/AU776786B2/en not_active Ceased
- 2001-01-08 WO PCT/US2001/000572 patent/WO2001051122A1/en active IP Right Grant
- 2001-01-08 NZ NZ519983A patent/NZ519983A/en unknown
- 2001-01-08 AT AT01901873T patent/ATE302634T1/en not_active IP Right Cessation
- 2001-01-08 DE DE60112886T patent/DE60112886T2/en not_active Expired - Lifetime
- 2001-01-08 KR KR1020027008751A patent/KR100734212B1/en not_active IP Right Cessation
- 2001-01-08 JP JP2001551542A patent/JP2003532453A/en active Pending
- 2001-01-08 MX MXPA02006658A patent/MXPA02006658A/en active IP Right Grant
- 2001-01-08 EP EP01901873A patent/EP1246665B1/en not_active Expired - Lifetime
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2002
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-
2003
- 2003-03-10 US US10/383,531 patent/US6853863B2/en not_active Expired - Lifetime
- 2003-03-10 US US10/383,583 patent/US6760627B2/en not_active Expired - Lifetime
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US9344817B2 (en) | 2000-01-20 | 2016-05-17 | Starkey Laboratories, Inc. | Hearing aid systems |
US9357317B2 (en) | 2000-01-20 | 2016-05-31 | Starkey Laboratories, Inc. | Hearing aid systems |
US7160434B2 (en) | 2002-03-22 | 2007-01-09 | Robert E. Moroney, Llc | Therapeutic electrolysis device |
EP1641518A4 (en) * | 2003-06-09 | 2008-11-19 | Univ Pennsylvania | Method and device for treating osteoarthritis, cartilage disease, defects and injuries in the human knee |
EP1641518A1 (en) * | 2003-06-09 | 2006-04-05 | The Trustees of The University of Pennsylvania | Method and device for treating osteoarthritis, cartilage disease, defects and injuries in the human knee |
US9808619B2 (en) | 2005-01-28 | 2017-11-07 | Encore Medical Asset Corporation | Independent protection system for an electrical muscle stimulation apparatus and method of using same |
EP1874404A2 (en) * | 2005-04-19 | 2008-01-09 | Compex Technologies, Inc. | Electrical stimulation device and method for therapeutic treatment and pain management |
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US9381346B2 (en) | 2006-07-05 | 2016-07-05 | Precisis Us, Inc. | Treatment of neurological disorders via electrical stimulation, and methods related thereto |
US9669211B2 (en) | 2007-02-13 | 2017-06-06 | Encore Medical Asset Corporation | Method and apparatus for applying neuromuscular electrical stimulation |
WO2009138961A1 (en) * | 2008-05-16 | 2009-11-19 | Koninklijke Philips Electronics N.V. | A method and system for dynamic recalibration of tens stimulation points to compensate for changing electrode conditions with fail-safe and auto-recovery functionality |
US8620434B2 (en) | 2008-05-16 | 2013-12-31 | Koninklijke Philips N.V. | Method and system for dynamic recalibration of tens stimulation points to compensate for changing electrode conditions with fail-safe and auto-recovery functionality |
US9037248B2 (en) | 2010-08-10 | 2015-05-19 | Case Western Reserve University | Method to treat pain through electrical stimulation of nerves |
EP2603282A4 (en) * | 2010-08-10 | 2014-01-08 | Univ Case Western Reserve | Method to treat pain through electrical stimulation of nerves |
EP2603282A1 (en) * | 2010-08-10 | 2013-06-19 | Case Western Reserve University | Method to treat pain through electrical stimulation of nerves |
US9974947B2 (en) | 2010-08-10 | 2018-05-22 | Case Western Reserve University | Method to treat pain through electrical stimulation of nerves |
US10994131B2 (en) | 2010-08-10 | 2021-05-04 | Case Western Reserve University | Method to treat pain through electrical stimulation of nerves |
WO2013071332A1 (en) * | 2011-11-16 | 2013-05-23 | Bodyflow International Pty Ltd Acn 114 356 231 | Method of reducing hospital stay after surgery |
EP2853286A1 (en) * | 2013-09-25 | 2015-04-01 | Inqba Srl | Device for treatment of perimplantitis |
WO2016048523A1 (en) * | 2014-09-25 | 2016-03-31 | L'oreal | Skin treatment appliance with changeable workpiece |
WO2018164563A1 (en) * | 2017-03-09 | 2018-09-13 | Instituto Tecnológico Y De Estudios Superiores De Occidente, A.C. | Portable radiofrequency diathermy device for medical therapy in injury recovery |
Also Published As
Publication number | Publication date |
---|---|
ES2248274T3 (en) | 2006-03-16 |
EP1246665A1 (en) | 2002-10-09 |
NO20023264D0 (en) | 2002-07-05 |
AU776786B2 (en) | 2004-09-23 |
ATE302634T1 (en) | 2005-09-15 |
KR20020074471A (en) | 2002-09-30 |
AU2772701A (en) | 2001-07-24 |
MXPA02006658A (en) | 2004-09-10 |
JP2003532453A (en) | 2003-11-05 |
NZ519983A (en) | 2005-01-28 |
WO2001051122A9 (en) | 2002-08-15 |
KR100734212B1 (en) | 2007-07-02 |
US20030181960A1 (en) | 2003-09-25 |
US20030195590A1 (en) | 2003-10-16 |
EP1246665B1 (en) | 2005-08-24 |
US6853863B2 (en) | 2005-02-08 |
US6792315B2 (en) | 2004-09-14 |
NO20023264L (en) | 2002-09-03 |
US6584358B2 (en) | 2003-06-24 |
US6760627B2 (en) | 2004-07-06 |
US20010031999A1 (en) | 2001-10-18 |
CA2396334A1 (en) | 2001-07-19 |
DE60112886D1 (en) | 2005-09-29 |
CA2396334C (en) | 2008-08-12 |
DK1246665T3 (en) | 2006-01-09 |
JP2006212458A (en) | 2006-08-17 |
US20030171793A1 (en) | 2003-09-11 |
US20050033381A1 (en) | 2005-02-10 |
DE60112886T2 (en) | 2006-06-14 |
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