U.S. patent application number 09/757804 was filed with the patent office on 2002-01-24 for method and apparatus for treating oropharyngeal, respiratory and oral motor neuromuscular disorders with electrical stimulation.
Invention is credited to Freed, Marcy L., Tucker, Howard.
Application Number | 20020010495 09/757804 |
Document ID | / |
Family ID | 22891137 |
Filed Date | 2002-01-24 |
United States Patent
Application |
20020010495 |
Kind Code |
A1 |
Freed, Marcy L. ; et
al. |
January 24, 2002 |
Method and apparatus for treating oropharyngeal, respiratory and
oral motor neuromuscular disorders with electrical stimulation
Abstract
A simple, non-invasive device and method for treating
oropharyngeal, respiratory, and oral motor neuromuscular disorders
provides electrical stimulation to various regions of a patient.
The method and device offer an effective and non-invasive treatment
for these disorders. The device is an electrical neuromuscular
stimulator that includes a pulse generator for generating a series
of electrical pulses and a processor coupled to the pulse generator
for controlling its operation. An electrode array of
uni-directional or bi-directional electrodes is coupled to the
pulse generator and provides electrical stimulation to the
appropriate neck, chest, or facial region of the patient. Using
bi-directional snap electrodes, for example, the electrode array
may also generate electrical feedback signals in response to the
neuromuscular stimulation of the patient. The electrical feedback
signals are provided to the processor, which generates and stores
test data and may modify the operation of the device in response to
the electrical feedback signals.
Inventors: |
Freed, Marcy L.; (Pepper
Pike, OH) ; Tucker, Howard; (Cleveland Heights,
OH) |
Correspondence
Address: |
COVINGTON & BURLING
ATTN: PATENT DOCKETING
1201 PENNSYLVANIA AVENUE, N.W.
WASHINGTON
DC
20004-2401
US
|
Family ID: |
22891137 |
Appl. No.: |
09/757804 |
Filed: |
January 11, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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09757804 |
Jan 11, 2001 |
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09236829 |
Jan 25, 1999 |
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6198970 |
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09236829 |
Jan 25, 1999 |
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08956448 |
Oct 23, 1997 |
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5987359 |
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08956448 |
Oct 23, 1997 |
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08549046 |
Oct 27, 1995 |
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5725564 |
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Current U.S.
Class: |
607/42 |
Current CPC
Class: |
A61N 1/36034 20170801;
A61N 1/37241 20130101; A61N 1/3601 20130101; A61N 1/36031
20170801 |
Class at
Publication: |
607/42 |
International
Class: |
A61N 001/36 |
Claims
We claim:
1. An electrical neuromuscular stimulator for treating respiratory
disorders comprising: at least one electrode adapted for selective
placement in electrical contact with tissue of at least one
intercostal region of a patient: and a pulse generator coupled to
said at least one electrode for generating a series of electrical
pulses, wherein said pulse generator comprises a frequency
controller for modulating an electrical signal generated by the
pulse generator at a predetermined frequency to produce the series
of electrical pulses output by said pulse generator, a duration
control circuit for controlling the duration of time for which said
pulse generator outputs the series of electrical pulses, and an
intensity control circuit for regulating the series electrical
pulses such that the electrical current does not exceed a
predetermined current or voltage value.
2. The electrical neuromuscular stimulator according to claim 1,
wherein said intensity control circuit regulates the series
electrical pulses such that the electrical current does not exceed
a predetermined current or voltage value.
3. The electrical neuromuscular stimulator according to claim 1,
wherein said predetermined current and voltage values vary in
accordance with the patient's physical condition or tolerances.
4. An electrical neuromuscular stimulator for treating respiratory
disorders, comprising: at least one pulse generator for generating
a series of electrical pulses; a processor coupled to said at least
one pulse generator for outputting operation control signals to
said at least one pulse generator; a switching network coupled to
said at least one pulse generator and said processor, said
switching network receiving the series of electrical pulses from
said at least one pulse generator and outputting, responsive to
switching control signals from said processor, the series of
electrical pulses; and an electrode array coupled to said switching
network for applying the series of electrical pulses to tissue of
at least one intercostal region of a patient.
5. The electrical neuromuscular stimulator according to claim 4,
wherein said electrode array generates electrical feedback signals
in response to neuromuscular stimulation of the patient, the
electrical feedback signals being provided to said processor via
said switching network.
6. The electrical neuromuscular stimulator according to claim 5,
wherein, in response to the electrical feedback signals, said
processor generates and stores test data.
7. The electrical neuromuscular stimulator according to claim 4,
wherein said switching network includes a buffer memory.
8. The electrical neuromuscular stimulator according to claim 5,
further comprising at least one physiological input device for
providing physiological input signals to said processor, wherein
said processor is responsive to the physiological inputs
signals.
9. The electrical neuromuscular stimulator according to claim 5,
further comprising at least one non-physiological input device for
providing non-physiological input signals to said processor,
wherein said processor is responsive to the non-physiological
inputs signals.
10. The electrical neuromuscular stimulator according to claim 5,
further comprising a programming device coupled to said
processor.
11. The electrical neuromuscular stimulator according to claim 8,
further comprising a display device coupled to said processor.
12. The electrical neuromuscular stimulator according to claim 4,
further comprising a data/software interface device coupled to said
processor.
13. The electrical neuromuscular stimulator according to claim 4,
wherein said electrode array comprises at least one bi-directional
electrode.
14. The electrical neuromuscular stimulator according to claim 4,
wherein said electrode array comprises at least one unidirectional
electrode.
15. A method of electrical neuromuscular stimulation for treating
respiratory disorders, comprising the steps of: generating a series
of electrical pulses using a pulse generator comprising: a
frequency controller for modulating an electrical signal generated
by the pulse generator at a predetermined frequency to produce the
series of electrical pulses output by said pulse generator, a
duration control circuit for controlling the duration of time for
which said pulse generator outputs the series of electrical pulses,
and an intensity control circuit for regulating the series
electrical pulses such that the electrical current does not exceed
a predetermined current or voltage value; and applying the series
of electrical pulses to tissue of at least one intercostal region
of a patient using an electrode array.
16. A method of electrical neuromuscular stimulation for treating
respiratory disorders, comprising the steps of: generating a series
of electrical pulses using at least one pulse generator; generating
operation control signals to control operation of said at least one
pulse generator; receiving the series of electrical pulses from
said at least one pulse generator at a switching network;
generating switching control signals to control operation of said
switching network; outputting the series of electrical pulses from
said switching network in accordance with said switching control
signals; applying the series of electrical pulses to tissue of a
least one intercostal region of a patient using an electrode array;
generating electrical feedback signals in response to the
application of the series of electrical pulses; generating test
data in response to the electrical feedback signals; and modifying
the operation control signals and switching control signals in
response to the electrical feedback signals.
17. The method for electrical neuromuscular stimulation according
to claim 16, further comprising the step of generating
physiological input signals using at least one physiological input
device; wherein the test data is generated in response to the
electrical feedback signals and the physiological input signals;
and wherein the operation control signals and switching control
signals are responsive to the electrical feedback signals and the
physiological inputs signals.
18. The method for electrical neuromuscular stimulation according
to claim 16, further comprising the step of generating
non-physiological input signals using at least one
non-physiological input device; wherein the test data is generated
in response to the electrical feedback signals and the
non-physiological input signals; and wherein the operation control
signals and switching control signals are responsive to the
electrical feedback signals and the non-physiological inputs
signals.
19. The method for electrical neuromuscular stimulation according
to claim 17, further comprising the step of monitoring of the
electrical feedback signals and the physiological input
signals.
20. The method for electrical neuromuscular stimulation according
to claim 18, further comprising the step of monitoring of the
electrical feedback signals and the non-physiological input
signals.
21. The method for electrical neuromuscular stimulation according
to claim 16, further comprising the step of downloading the test
data to a test data receiving device.
22. An electrical neuromuscular stimulator for treating oral motor
neuromuscular disorders, comprising: at least one electrode adapted
to be selectively placed in electrical contact with tissue of an
oral motor region of a patient; and a pulse generator for
generating a series of electrical pulses in electrical contact with
said at least one electrode, wherein said pulse generator comprises
a frequency controller for modulating an electrical signal
generated by the pulse generator at a predetermined frequency to
produce the series of electrical pulses output by said pulse
generator, a duration control circuit for controlling the duration
of time for which said pulse generator outputs the series of
electrical pulses, and an intensity control circuit for regulating
the series electrical pulses such that the electrical current does
not exceed a predetermined current or voltage value.
23. The electrical neuromuscular stimulator according to claim 22,
wherein said predetermined current and voltage values vary in
accordance with the patient's physical condition or tolerances.
24. An electrical neuromuscular stimulator for treating oral motor
neuromuscular disorders, comprising: at least one pulse generator
for generating a series of electrical pulses; a processor coupled
to said at least one pulse generator for outputting operation
control signals to said at least one pulse generator; a switching
network coupled to said at least one pulse generator and said
processor, said switching network receiving the series of
electrical pulses from said at least one pulse generator and
outputting, responsive to switching control signals from said
processor, the series of electrical pulses; and an electrode array
coupled to said switching network for applying the series of
electrical pulses to tissue of an oral motor region of a
patient.
25. The electrical neuromuscular stimulator according to claim 24,
wherein said electrode array generates electrical feedback signals
in response to the neuromuscular stimulation of the patient, the
electrical feedback signals being provided to said processor via
said switching network.
26. The electrical neuromuscular stimulator according to claim 25,
wherein, in response to the electrical feedback signals, said
processor generates and stores test data.
27. The electrical neuromuscular stimulator according to claim 24,
wherein said switching network includes a buffer memory.
28. The electrical neuromuscular stimulator according to claim 25,
further comprising at least one physiological input device for
providing physiological input signals to said processor, wherein
said processor is responsive to the physiological inputs
signals.
29. The electrical neuromuscular stimulator according to claim 25,
further comprising at least one non-physiological input device for
providing non-physiological input signals to said processor,
wherein said processor is responsive to the non-physiological
inputs signals.
30. The electrical neuromuscular stimulator according to claim 25,
further comprising a programming device coupled to said processor
for transmitting programming information and data to said
processor.
31. The electrical neuromuscular stimulator according to claim 28,
further comprising a display device coupled to said processor for
monitoring at least one of the electrical feedback signals,
physiological input signals, test data, and operating status of
said neuromuscular stimulator.
32. The electrical neuromuscular stimulator according to claim 28,
further comprising a display device coupled to said processor for
monitoring at least one of the electrical feedback signals,
non-physiological input signals, test data, and operating status of
said neuromuscular stimulator.
33. The electrical neuromuscular stimulator according to claim 24,
further comprising a data/software interface device coupled to said
processor for transmitting the test data.
34. The electrical neuromuscular stimulator according to claim 24,
wherein said electrode array comprises at least one bi-directional
electrode.
35. The electrical neuromuscular stimulator according to claim 24,
wherein said electrode array comprises at least one unidirectional
electrode.
36. A method of electrical neuromuscular stimulation for treating
oral motor neuromuscular disorders, comprising the steps of:
generating a series of electrical pulses using a pulse generator
comprising: a frequency controller for modulating an electrical
signal generated by the pulse generator at a predetermined
frequency to produce the series of electrical pulses output by said
pulse generator, a duration control circuit for controlling the
duration of time for which said pulse generator outputs the series
of electrical pulses, and an intensity control circuit for
regulating the series electrical pulses such that the electrical
current does not exceed a predetermined current or voltage value;
and applying the series of electrical pulses to tissue of an oral
motor region of a patient using an electrode array.
37. A method of electrical neuromuscular stimulation for treating
oral motor neuromuscular disorders, comprising the steps of:
generating a series of electrical pulses using at least one pulse
generator; generating operation control signals to control
operation of said at least one pulse generator; receiving the
series of electrical pulses from said at least one pulse generator
at a switching network; generating switching control signals to
control operation of said switching network; outputting the series
of electrical pulses from said switching network in accordance with
said switching control signals; applying the series of electrical
pulses to tissue of an oral motor region of a patient using an
electrode array; generating electrical feedback signals in response
to the application of the series of electrical pulses; generating
test data in response to the electrical feedback signals; and
modifying the operation control signals and switching control
signals in response to the electrical feedback signals.
38. The method for electrical neuromuscular stimulation according
to claim 37, further comprising the step of generating
physiological input signals using at least one physiological input
device; wherein the test data is generated in response to the
electrical feedback signals and the physiological input signals;
and wherein the operation control signals and switching control
signals are responsive to the electrical feedback signals and the
physiological inputs signals.
39. The method for electrical neuromuscular stimulation according
to claim 37, further comprising the step of generating
non-physiological input signals using at least one
non-physiological input device; wherein the test data is generated
in response to the electrical feedback signals and the
non-physiological input signals; and wherein the operation control
signals and switching control signals are responsive to the
electrical feedback signals and the non-physiological inputs
signals.
40. The method for electrical neuromuscular stimulation according
to claim 38, further comprising the step of monitoring of the
electrical feedback signals and the physiological input
signals.
41. The method for electrical neuromuscular stimulation according
to claim 39, further comprising the step of monitoring of the
electrical feedback signals and the non-physiological input
signals.
42. The method for electrical neuromuscular stimulation according
to claim 37, further comprising the step of downloading the test
data to a test data receiving device.
Description
RELATED APPLICATIONS
[0001] This application is a continuation-in part of U.S.
application Ser. No. 08/956,448, filed Oct. 23, 1997, entitled
"Method for Treating Dysphagia with Electrical Stimulation," which
is a continuation of U.S. application Ser. No. 08/549,046, filed
Oct. 27, 1995, and entitled "Method for Treating Dysphagia With
Electrical Stimulation," issued as U.S. Pat. No. 5,725,564.
FIELD OF THE INVENTION
[0002] This invention relates to a method and apparatus for
effectively treating oropharyngeal, respiratory, and oral motor
neuromuscular disorders. In particular, the present invention
relates to a method and apparatus for treating oropharyngeal,
respiratory and oral motor neuromuscular disorders by providing
electrical stimulation to specific muscle regions of a patient
using one or more snap electrodes.
BACKGROUND OF THE INVENTION
[0003] Asymptomatic and symptomatic oropharyngeal disorders can
lead to an inability to swallow or difficulty in swallowing. These
disorders may be caused, for example, by stroke. neurodegenerative
diseases, brain tumors or respiratory disorders.
[0004] Swallowing is a complicated action whereby food is moved
from the mouth through the pharynx and esophagus to the stomach.
The act of swallowing may be initiated voluntarily or reflexively
but is always completed reflexively.
[0005] The act of swallowing occurs in three stages and requires
the integrated action of the respiratory center and motor functions
of multiple cranial nerves, and the coordination of the autonomic
system within the esophagus. In the first stage, food or some other
substance is placed on the surface of the tongue. The tip of the
tongue is placed against the hard palate. Elevation of the larynx
and backward movement of the tongue forces the food through the
isthmus of the fauces in the pharynx. In the second stage, the food
passes through the pharynx. This involves constriction of the walls
of the pharynx, backward bending of the epiglottis, and an upward
and forward movement of the larynx and trachea. Food is kept from
entering the nasal cavity by elevation of the soft palate and from
entering the larynx by closure of the glottis and backward
inclination of the epiglottis. During this stage, respiratory
movements are inhibited by reflex. In the third stage, food moves
down the esophagus and into the stomach. This movement is
accomplished by momentum from the second stage, peristaltic
contractions, and gravity.
[0006] Although the main function of swallowing is the propulsion
of food from the mouth into the stomach, swallowing also serves as
a protective reflex for the upper respiratory tract by removing
particles trapped in the nasopharynx and oropharynx, returning
materials refluxed from the stomach into the pharynx, or removing
particles propelled from the upper respiratory tract into the
pharynx. Therefore, the absence of adequate swallowing reflex
greatly increases the chance of pulmonary aspiration.
[0007] In the past, patients suffering from oropharyngeal disorders
have undergone dietary changes or thermal stimulation treatment to
regain adequate swallowing reflexes. Thermal stimulation involves
immersing a mirror or probe in ice or another cold substance. The
tonsillar fossa is stimulated with the mirror or probe, and the
patient closes his mouth and attempts to swallow. While these
traditional methods are usually effective for treating
oropharyngeal disorders, in some patients these methods require
that the patient endure weeks or months of therapy. It is also
difficult to distinguish these patients who require more extensive
treatments from patients who recover spontaneously. Thus, it is
desirable to have a simple, non-invasive method and device for
treating oropharyngeal disorders and artificially promoting
swallowing which is effective within a relatively short treatment
period.
[0008] Electrical stimulation has been used as a method for
alleviating pain and stimulating nerves, as well as a means for
treating disorders of the spinal cord or peripheral nervous system.
Electrical stimulation has further been used to facilitate muscle
reeducation and with other physical therapy treatments. In the
past, electrical stimulation was not recommended for use in the
neck because of the theoretical concerns that the patient would
develop spasms of the laryngeal muscles, resulting in closure of
the airway or difficulty in breathing. Further, the introduction of
electrical current into the neck near the carotid body may cause
cardiac arrhythmia.
[0009] More recently, electrical stimulation has been used to
stimulate the recurrent laryngeal nerve to stimulate the laryngeal
muscles to control the opening of the vocal cords to overcome vocal
cord paralysis, to assist with the assessment of vocal cord
function, to aid with intubation, and other related uses. There
have been no adverse reactions to such treatment techniques.
However, electrical stimulation has not been used in the treatment
of oropharyngeal disorders to promote the swallowing reflex, which
involves the integrated action of the respiratory center and motor
functions of multiple cranial nerves.
[0010] The oral motor skills needed to effectively speak, chew and
swallow include the ability to open and close the mouth, the
ability to elevate the tongue, the ability to lateralize the
tongue, and the ability to purse the lips. Deficiencies in one or
more of these oral motor skills as sometimes occurs in children and
stroke victims, for example, can delay or cause a complete
inability of a patient to achieve safe oral intake.
[0011] Known treatment techniques for oral motor skills
deficiencies typically require lengthy treatment periods to achieve
the skills necessary to speak and swallow. Thus, there is a need
for a method of treatment that enables development of these skills
with relatively fewer treatments performed within a shorter period
of time.
[0012] Chronic respiratory disorders, including asthma, bronchitis,
asthma-like symptoms, chronic obstructive pulmonary disease, and
actelectasis are common and often debilitating disorders.
Individuals suffering from one or more of these disorders may incur
the expense of high-cost medications and may be severely limited in
terms of the physical activities they are able to undertake. These
individuals may also be placed on ventilators because they are
unable to breathe deeply enough without the aid of a ventilator.
Such ventilator dependence substantially increases the cost to the
patient and severely restricts the patient's mobility. Thus, there
is a need for a simple, inexpensive treatment for chronic
respiratory disorders that reduces the coughing and inflammation
associated with such disorders, for example, to allow the patient
to be extubated from a ventilator and/or to reduce or eliminate the
medications needed by the patient, thereby substantially reducing
the costs of the treatment and improving the quality of life of the
patient.
SUMMARY OF THE INVENTION
[0013] The present invention provides a simple, non-invasive method
and device for treating oropharyngeal disorders and artificially
promoting swallowing. The present invention further provides a
simple, non-invasive method and device for treating respiratory
disorders such as asthma, bronchitis, and chronic obstructive
pulmonary disease to provide improved respiratory capacity of a
patient. The present invention also provides a simple, non-invasive
method and device for treating oral motor neuromuscular damage and
disorders to provide improved control and usage of oral motor
muscles.
[0014] According to one embodiment of the present invention, a
method and device provide electrical stimulus to the pharyngeal
region of a patient (a human or other animal) to stimulate muscles
and nerves located in the pharyngeal region in order to promote
swallowing.
[0015] The method and device for electrical pharyngeal
neuromuscular stimulation according to the present invention are
more effective for treating oropharyngeal disorders than
traditional treatment methods, such as thermal stimulation.
Further, the method and device of the present invention are
effective for treating worst-case dysphagia resulting from
neurodegeneration and strokes.
[0016] According to another embodiment of the present invention, a
method and device provide electrical stimulus to the intercostal
muscle regions between the ribs of a patient to enable improved
respiratory functions of the patient, treating respiratory
disorders such as asthma, bronchitis or chronic obstructive
pulmonary disease, and further treating ventilator dependence (also
known as life support) conditions of patients with no ability to
breathe independently. By providing electrical stimulation to these
muscles, deeper self-motivated inhalations and exhalations may be
achieved by the patient. The method and device according to the
present invention may substantially reduce coughing and
inflammation suffered by the patient, substantially increase the
air intake and outflow of the patient, and may allow a patient on a
ventilator to achieve sufficiently deep aspirations to enable
extubation of the patient from the ventilator.
[0017] None of the known treatments for respiratory disorders is
capable of safely achieving the results achieved by the method and
device according to the present invention. The method and device
according to the present invention may also eliminate the long-term
costs and potential side effects from inhalers and other
medications, as well as avoid the need for high-cost, long-term
ventilator care.
[0018] According to another embodiment of the present invention,
the method and device provide electrical stimulation to various
oral motor muscles and nerves to enable treatment of muscle and
nerve damage and disorders of these muscles. Use of the method and
device according to the present invention may result in substantial
improvement of the physical skills needed to speak, chew, and
swallow effectively after only a few treatments, for example two to
three treatments, thereby allowing expedited recovery of the
patient. The present invention facilitates the retraining and use
of the oral motor muscles to enable the patient to speak, chew and
swallow, thereby allowing safe intake of food and liquids and
regular self-motivated breathing. Moreover, the method and device
according to the present invention may be used to apply electrical
stimulation to oral motor muscles to create a more normal facial
appearance of a patient and enable use and control of the oral
motor muscles within only a few treatments, for example, five to
eight treatments. In contrast, known techniques often involve
lengthy treatment periods, for example, of a year or more, and
often do not enable the patient to successfully regain oral motor
skills.
[0019] An apparatus for treating oropharyngeal, respiratory, and
oral motor neuromuscular disorders according to the present
invention includes a plurality of electrodes adapted to provide
selective electrical stimulation to the tissue of a patient and a
pulse generator preferably coupled to each of the plurality of
electrodes, for generating a series of electrical pulses. The pulse
generator preferably includes a frequency controller, which
modulates an electrical signal generated by the pulse generator at
a predetermined frequency to produce the series of electrical
pulses output by the pulse generator. The pulse generator also
includes a duration control circuit for controlling the duration of
time for which the pulse generator outputs the series of electrical
pulses. An intensity control circuit regulates the series
electrical pulses such that the electrical current does not exceed
a predetermined current or voltage value. The predetermined current
and voltage values may vary in accordance with the patient's
physical condition and tolerances and the treatments performed.
[0020] A method for treating oropharyngeal, respiratory, and oral
motor neuromuscular disorders according to the present invention
includes the steps of generating a series of electrical pulses
using the pulse generator described above; generating operation
control signals to control operation of the pulse generator; and
applying the series of electrical pulses to the tissue of a patient
to achieve neuromuscular stimulation of a patient.
[0021] Another apparatus for treating oropharyngeal, respiratory,
and oral motor neuromuscular disorders according to the present
invention includes one or more pulse generators for generating a
series of electrical pulses and a processor coupled to the pulse
generators for outputting operation control signals to the pulse
generators. A switching network is coupled to the pulse generators
and the processor. The switching network receives the series of
electrical pulses from the pulse generators and outputs the series
of electrical pulses in accordance with switching control signals
received from the processor. An electrode array is also coupled to
the switching network. The electrode array applies the series of
electrical pulses output by the switching network to tissue of a
patient to achieve neuromuscular stimulation of the patient, and
also generates electrical feedback signals in response to the
neuromuscular stimulation of the patient. The electrical feedback
signals are provided to the processor via the switching network.
The processor generates and stores test data and modifies the
operation control signals and switching control signals in response
to the electrical feedback signals.
[0022] Another method for treating oropharyngeal, respiratory, and
oral motor neuromuscular disorders according to the present
invention includes the steps of generating a series of electrical
pulses using one or more pulse generators; generating operation
control signals to control operation of the pulse generators;
receiving the series of electrical pulses from the pulse generators
at a switching network; generating switching control signals to
control operation of the switching network; outputting the series
of electrical pulses from the switching network in accordance with
the switching control signals; applying the series of electrical
pulses to the tissue of a patient to achieve neuromuscular
stimulation of a patient; generating electrical feedback signals in
response to the neuromuscular stimulation of the patient;
generating test data in response to the electrical feedback
signals; and modifying the operation control signals and switching
control signals in response to the electrical feedback signals.
[0023] A novel size and arrangement of snap electrodes may be
utilized to enable effective stimulation of the muscles and nerves
in the respective regions of the patient. In this novel size and
arrangement of snap electrodes, each snap electrode provides a halo
or circle of electrical output, such that the electrical field is
concentrated at the outer circumference of the electrode and not
evenly dispersed over the surface of the electrode. This is in
contrast to pin-type electrodes, commonly used in electrical
stimulation applications, which provide an even, dispersed field of
electrical output over the entire surface of the electrode. As a
result of the concentration of the electrical output of snap
electrodes around their circumferences, less electrical intensity
is required to treat the patient when using snap electrodes than
when using pin electrodes. Thus, the electrical output produced by
the novel size and arrangement of snap electrodes according to the
present invention enables the stimulated muscles to achieve
stronger squeeze and contractility without exceeding the tolerance
or comfort level of the patient. In contrast, achieving the same
degree of squeeze and contractility with larger, standard
electrodes requires the use of a substantially higher intensity of
electrical stimulation, which frequently exceeds the tolerance or
comfort level of the patient. Moreover, the size of a snap
electrode may be reduced without decreasing the electrical output
of the electrode, providing for additional treatment flexibility,
such as treatment of small children.
[0024] These and other aspects of the invention will be apparent to
those skilled in the art upon reading and understanding the
specification that follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is a diagram of an electrical neuromuscular
stimulator according to the present invention for use in treating
dysphagia and respiratory disorders, and for stimulating the oral
motor muscles of a patient.
[0026] FIG. 2 is a flow chart of a method for electrical pharyngeal
neuromuscular stimulation according to the present invention for
promoting swallowing.
[0027] FIG. 3 is a view of a portion a pharyngeal region of a
patient illustrating an exemplary placement of two electrodes
according to the present invention.
[0028] FIG. 4 is a view of a portion a pharyngeal region of a
patient illustrating an exemplary placement of electrodes according
to the present invention.
[0029] FIG. 5 is a graph illustrating the effectiveness of electric
pharyngeal neuromuscular stimulation method and device according to
the present invention.
[0030] FIG. 6 is a block diagram of an alternative embodiment of an
electrical neuromuscular stimulator according to the present
invention, including a microprocessor system, a plurality of pulse
generators, and a bi-directional analog switching network.
[0031] FIG. 7 is a diagram of an electrode array that may be used
in conjunction with the embodiment of FIG. 6 to provide
neuromuscular stimulation to a patient and to provide feedback
signals to the bi-directional analog switching network of FIG.
6.
[0032] FIG. 7A illustrates the placement of an electrode array
including four bi-directional electrodes on the pharyngeal region
of a human patient.
[0033] FIG. 8 is a diagram of an alternative method for electrical
pharyngeal neuromuscular stimulation according to the present
invention for promoting swallowing.
[0034] FIGS. 9A, 9B, 9C, 9D and 9E are diagrams of preferred
placements of electrodes used to perform the method for electrical
intercostal neuromuscular stimulation of FIGS. 10 and 11.
[0035] FIG. 10 is a flow chart of a method for electrical
intercostal neuromuscular stimulation according to the present
invention for treating respiratory disorders and ventilator
dependence conditions.
[0036] FIG. 11 is a flow chart of an alternative method for
electrical intercostal neuromuscular stimulation according to the
present invention for treating respiratory disorders and ventilator
dependence conditions.
[0037] FIG. 12 is a diagram of a preferred placement of electrodes
used to perform the method for electrical neuromuscular stimulation
of oral motor muscles of FIGS. 13 and 14.
[0038] FIG. 13 is a flow chart of a method for electrical
neuromuscular stimulation of oral motor muscles according to the
present invention for treating damage and disorders of oral motor
muscles and nerves.
[0039] FIG. 14 is a flow chart of an alternative method for
electrical neuromuscular stimulation of oral motor muscles
according to the present invention for treating damage and
disorders of oral motor muscles and nerves.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0040] The present invention will now be described in detail with
reference to the accompanying drawings, which are provided as
illustrative examples of embodiments of the invention only and not
for purposes of limiting the same. In the drawings, like reference
numerals indicate like elements throughout the several views.
[0041] FIG. 1 illustrates a preferred embodiment of an electrical
neuromuscular stimulation device 10 for providing electrical
neuromuscular stimulus to specific regions of a patient in order to
artificially promote swallowing, to treat respiratory disorders, or
to provide neuromuscular stimulation to oral motor regions of the
patient. The electrical neuromuscular stimulation device 10 as
shown in FIG. 1 is comprised of a plurality of electrodes 12
(including individual electrodes 12a, 12b, and 12c) adapted to be
selectively placed in electrical contact with tissue of a patient,
and a pulse generator 20 for generating a series of electrical
pulses, which is coupled to each of the plurality of electrodes
12.
[0042] The device 10 preferably includes at least two electrodes
12a and 12b, although three electrodes (12a, 12b, and 12c) are
shown in FIG. 1. For human applications, the electrodes 12a, 12b
and 12c may preferably be snap electrodes having approximate
measurements as follows: an eleven-millimeter diameter circular
metal snap electrode affixed to the patient using strips of
adhesive tape or using a circular adhesive pad for each electrode
having an approximate radius of two millimeters greater than that
of the electrode for adult applications. A three-eighths inch
diameter circular metal snap electrode affixed with strips of
adhesive tape or with a circular adhesive pad for each electrode
having an approximate radius two-millimeters greater than that of
the electrode may be used for child applications. The electrodes
may alternatively be made of piezoelectric material. The adhesive
portion of each electrode (e.g., 12a, 12b, and 12c) is preferably a
conventional conductive skin adhesive manufactured from a
polyethylene-glycol polymer. Because the conductivity of the
adhesive is dependent on the water content in the polymer, the
addition of a small amount of salt will further aid conduction by
the adhesive. For child applications, hi-tack versions of the
adhesive are preferred because of the small contact area. A hi-tack
adhesive called RG-72 is available from the Promeon Company. The
electrodes 12a, 12b and 12c may also be any suitably conventional
and convenient shapes that are suited for physiological
applications.
[0043] In a preferred embodiment, lead wires 14 are attached to
each electrode and are suitable for attachment to the pulse
generator 20. Lead wires 14 may be made from any physiologically
acceptable conductive metal, preferably insulated aluminum or
copper wire. Multistrand wire is preferable to "wire wrap" wire
because multistrand wire is softer and less likely to break with
repeated flexing.
[0044] The series of electrical pulses is generated by selective
control of pulse generator 20, which provides the series of
electrical pulses to the plurality of electrodes 12 via an
amplifier 18. Pulse generator 20 preferably includes a frequency
controller 22 (shown as separate component in FIG. 1) which
modulates an electrical signal generated by the pulse generator at
a predetermined frequency to produce the series of electrical
pulses output by the pulse generator 20. The frequency controller
22 may modulate the electrical signal at a fixed frequency, for
example, 80 hertz, or may vary the frequency of the electrical
pulses within a predetermined range of frequencies, for example, a
range of frequencies from 4 to 80 hertz. Other frequency ranges as
known in the art may also be used. Generally, the frequency of the
electrical pulses is selected in order to provide the greatest
comfort to the patient and to minimize as much as possible the
amount of pin-prick sensation felt by the patient.
[0045] The pulse generator 20 also preferably includes a duration
control 24 for controlling the duration of time for which pulse
generator 20 outputs the series of electrical pulses. The duration
control 24 may control pulse generator 20 to output the electrical
pulses for a fixed duration, for example, generally fixed at 300
microseconds. Alternatively, the duration control 24 may control
pulse generator 20 to output the electrical pulses for varying
durations within a predetermined range, for example a range of 50
to 300 microseconds, and may further create one or more pauses of
varying duration during the application of the electrical pulses to
the patient's tissue. Other durations as known in the art may also
be used. The duration control 24 may be adjusted manually or
automatically using conventional circuits, such as a timer 40.
[0046] In the embodiment depicted in FIG. 1, the generator is
further comprised of an intensity control circuit 26 (shown as a
separate component in FIG. 1) for regulating the series electrical
pulses such that the electrical current does not exceed a
predetermined current value, for example, 25 milliamps RMS, and the
power does not exceed a predetermined voltage value, for example,
9.6 MW RMS, or both. In a preferred embodiment, the intensity
control circuit 26 limits the current and voltage values of the
electrical pulses output by pulse generator 20 using conventional
limiter circuits. The predetermined current and voltage values may
vary in accordance with the patient's physical condition and
tolerances and the treatments performed. Generally, the intensity
of the current and voltage outputs is determined in order to
provide the greatest comfort to the patient and to minimize as much
as possible the amount of pin-prick sensation felt by the
patient.
[0047] For example, in treatment of oropharyngeal disorders, the
current applied should be sufficient to produce the desired
response and promote the swallowing reflex. The intensity of the
current is increased by small increments until the swallow response
or muscle fasciculation occurs. However, the current that is
applied should not be too intense in order to avoid laryngeal
spasms or cardiac arrhythmia in the patient.
[0048] Similarly, in treatment of respiratory disorders, the amount
of current applied should be selected so as not to adversely affect
the function of the patient's heart or lungs. In the treatment of
oral motor neuromuscular disorders, the intensity of the current
applied and the placement of the electrodes are selected so as to
avoid any damage to the patient's tissue or skin. Accordingly, in a
preferred embodiment of the present invention, a current of up to
approximately 100 milliamps may be applied in respiratory and oral
motor neuromuscular treatments.
[0049] In the preferred embodiment depicted in FIG. 1, pulse
generator 20 also includes an amplitude control circuit 28 (shown
as a separate component in FIG. 1). Amplitude control circuit 28
allows for selective control of the amplitude of the electrical
pulses generated by pulse generator 20 by manually or automatically
operated conventional circuits as are known in the art.
[0050] In a preferred embodiment, a channel selector 30 suitably
forms another input to amplifier to allow for concurrent activation
of additional sets of electrodes (not shown) using conventional
switching circuits. The status of channel selector 30 is indicated
by a channel selector indicator 32.
[0051] In one embodiment of the present invention, the pulse
generator 20 continuously generates electrical pulses for a
predetermined period of time. For example, electric pulses may be
continuously generated and delivered to the electrodes until a
complete swallow is achieved or the sensory tolerance level is
reached in the patient. Additional treatments wherein the generator
continuously generates electric pulses are suitably performed on
the patient as necessary.
[0052] In an alternative embodiment of the present invention, the
pulse generator 20 selectively generates cycles of electrical
pulses. In this embodiment, pulse generator 20 includes a treatment
time control function, which is accomplished with intensity control
26 in response to real time information provided by timer 40. The
timer 40, intensity control 26, and pulse generator 16 also serve
to provide functions of treatment time control, on-ramp control,
and off-ramp control.
[0053] In a preferred embodiment, the treatment time control
function selectively controls the duration of time wherein the
pulse generator 20 selectively generates cycles of electric pulses.
The treatment time is any suitable period, such as fifteen, thirty,
or sixty minutes or continuous treatment. As with all settings, the
particular values are highly specific to the application and
patient. Thus, a suitable duration of the electric pulses in each
cycle is manually or automatically set. In one embodiment according
to the present invention, the duration of electric pulses in each
cycle is within the range of 0.5 seconds to 30 seconds. Other
durations as known in the art may also be used.
[0054] In a preferred embodiment, the treatment time control
function also selectively controls the amount of time between each
treatment cycle. For example, the treatment time control may be set
to provide a delay between treatment cycles ranging from 0.1
seconds, for example, for facial and respiratory treatments, to 60
seconds, for other oropharyngeal applications. Other ranges as
known in the art may also be used.
[0055] In a preferred embodiment, the on-ramp control function
controls the amount of time required to reach the maximum intensity
in each cycle. In one embodiment of the present invention, the
amount of time required to reach the maximum intensity is between
approximately 0.1 and 6.0 seconds. According to a preferred
embodiment of the present invention, the maximum intensity in
facial and respiratory treatments may be reached in 0.1 second or
less to reach the maximum intensity as rapidly as possible. Other
times as known in the art may also be used.
[0056] In a preferred embodiment, the off-ramp control function
controls the amount of time required to decrease from the maximum
intensity to zero intensity at the end of each cycle. In one
embodiment of the present invention, the amount of time required to
decrease from the maximum intensity to zero intensity is between
approximately 0.1 and 6.0 seconds. Other times as known in the art
may also be used.
[0057] A suitable commercially available device that provides the
functions described above is a Staodyn.sup.7 EMS+2 System
manufactured by Staodyn, Inc. of Longmont, Colo.
[0058] An alternative embodiment of a device for electrical
neuromuscular stimulation according to the present invention will
now be described with reference to FIG. 6.
[0059] FIG. 6 illustrates a microprocessor-based stimulation device
600 according to the present invention including a microprocessor
601, a bi-directional analog switching network 602, and a plurality
of pulse generators 603, 604, 605 and 606. Microprocessor 601
controls the operation of pulse generators 603 through 606 by
generating control signals indicating the parameters for generation
of electrical pulses for each pulse generator 603 through 606
respectively. For example, control signals provided by
microprocessor 601 to each pulse generator 603 through 606 may
include waveform, intensity, pulse width, ramp-on, and ramp-off
control signals. Upon receipt of the respective control signals
from microprocessor 601, pulse generators 603 through 606 generate
electrical pulses and output the pulses to bi-directional analog
switching network 602.
[0060] In the preferred embodiment depicted in FIG. 6,
microprocessor 601 is also coupled to bi-directional analog
switching network 602 and provides control signal to switching
network 602 to control the operation of switching network 602 in
processing and selectively outputting the electrical pulses to a
bi-directional electrode array 607 coupled to switching network
602.
[0061] In the preferred embodiment depicted in FIG. 6, switching
network 602 receives electrical pulses generated by each of pulse
generators 603 through 606. Based upon the control signals from
microprocessor 601 to switching network 602 control, switching
network 602 outputs the electrical pulses from one or more of pulse
generators 603 through 606 to electrodes 710, 702, 703 and 704
(various exemplary arrangements of electrodes are shown in FIGS. 7,
9A-E, and 12) in electrode array 607 via lead wires 710, 711, 712,
and 713 respectively. The control signals from microprocessor 601
to switching network 602 determine, for example, the sequence in
which the electrical pulses from each of pulse generators 603
through 606 are provided to each electrode in electrode array 607
and the duration for which electrical pulses from each pulse
generator will be provided to each electrode. Notably, switching
network 602 may include one or more conventional buffer memories
(not shown) to prevent overloading of the network.
[0062] According to one embodiment of the present invention,
microprocessor 601, switching network 602 and pulse generators 603
through 606 may be designed to provide maximum flexibility of
operation. Thus, each of the pulse generators may be capable of
providing electrical pulses having either fixed or variable current
and voltage values, modulation rates and frequencies. The waveform,
intensity, and ramp-on and ramp-off functions provided by each
pulse generator 603 through 606 may also be variably selected.
Stimulation device 600 allows each of pulse generators 603 through
606 to independently produce simultaneous and/or sequential
stimulation by each of the electrodes in electrode array 607.
Generally, the waveform and intensity of the electrical pulses is
selected and/or pre-programmed in order to provide the greatest
comfort to the patient and to minimize as much as possible the
amount of pin-prick sensation felt by the patient.
[0063] In the preferred embodiment depicted in FIG. 6,
microprocessor 601 is coupled to a programming device 608, which
enables the microprocessor to be programmed to perform the
processing functions in accordance with the present invention. Data
may also be provided to microprocessor 601 by programming device
608. Programming of microprocessor 601 and downloading of data to
the microprocessor may be accomplished through a conventional
interface, such as standard RS232 serial and parallel ports or
infrared links, as is known in the art.
[0064] Stimulation device 600 depicted in FIG. 6 also includes a
feedback network for receiving and processing feedback received
from electrode array 607. For example, electrode array 607 may use
electromyographic (EMG) sensing capabilities to generate electrical
feedback signals. The EMG sensing capabilities are utilized, for
example, to determine whether muscles are contracting and, if so,
the sequence of muscle contractions. This information may be used
to adjust the electrical pulses supplied to stimulate these
muscles. In treatments of oropharyngeal disorders, muscle
contraction information may also be used to identify the patient's
attempts to swallow, enabling the stimulator to facilitate the
remainder of the swallowing sequence.
[0065] The feedback signals generated by electrode array 607 are
provided to switching network 602 that outputs the feedback signals
to a receiver amplifier 613. Receiver amplifier 613 amplifies the
feedback signals and outputs the amplified feedback signals to a
conversion circuit 612. Conversion circuit 612 formats the
amplified feedback signals into a selected signal format and
outputs the formatted feedback signals to an input processor 611.
The selected signal format into which conversion circuit 612
converts the feedback signals is selected to enable input processor
611 to download and process the feedback signals.
[0066] In the preferred embodiment depicted in FIG. 6, input
processor 611 also optionally receives one or more physiological
and/or non-physiological inputs from input devices 615, 616, 617,
618, 619, 620 and 621. The physiological input devices such as
devices 616, 617, 618, 619 and 620 provide inputs representing
various physiological characteristics of the patient. For example,
physiological inputs may be received from such devices as an
accelerometer 616 (indicating motion due to a contraction of the
muscle during swallowing), a manometry device 617 (indicating
pressure increase due to the attempt at swallowing), a video
fluoroscopy device 618 (for providing an input from visual
examination of the patient's swallowing mechanism to determine the
effectiveness of the swallow), an EMG device 619 (indicating muscle
movements in the oral motor muscles and/or swallowing mechanism
which may not be detected by the electrode stimulation patch),
and/or an acoustic signaling device 620, e.g., a microphone placed
on the neck of the patient, to detect speech and/or swallowing
sounds.
[0067] Non-physiological devices such as device 615 may provide
inputs representing various non-physiological characteristics of
the patient. Non-physiological inputs may be received from such
sources as therapist/patient/doctor input device 615 which enables
a therapist, patient and/or doctor to enter information such as the
patient's threshold for the stimulation device parameters,
including a minimum threshold needed and the maximum intensity
usable for the patient, as well as parameters for altering the
sequence and intensity of electrode stimulation for the patient
based upon asymmetries which the patient may have during the
swallowing process, respiratory process or oral motor stimulation
process.
[0068] Additional factors such as height, weight, neck
thickness/size, torso measurements, facial dimensions, pain
tolerance, and the current status of the patient's ability to
swallow, breathe, or control oral motor muscles may be entered for
use in determining the appropriate stimulation frequency patterns
and intensities (depending on the type of treatment). Additional
physiological and/or non-physiological inputs may be received from
other devices as indicated by representative input device 621.
[0069] In a preferred embodiment, the physiological and
non-physiological inputs respectively generated by physiological
and non-physiological input devices 615 through 620 are formatted
by a conversion circuit 614 (similar to conversion circuit 612) and
then stored and processed by input processor 611. Input processor
611 processes and stores as test data both the feedback signals
originated by electrode array 607 and physiological and
non-physiological inputs from devices 615 through 620. Input
processor also receives control signals and data inputs from
microprocessor 601.
[0070] In the preferred embodiment depicted in FIG. 6, a system and
patient interaction display 610 is optionally provided. Display 610
is coupled to microprocessor 601 and receives processed data from
input processor 611 via microprocessor 601. In this manner, display
610 enables monitoring of the feedback signals from electrode array
607 in addition to the status of inputs from the various
physiological and non-physiological inputs 615 through 620 as
described above. Display 610 may also enable monitoring of the
operating status of stimulation device 600.
[0071] The display 610 may display a variety of parameters, inputs,
and outputs as may be desired. For example, display 610 may show
current patient parameters, current inputs from the physiological
and non-physiological devices and the electrode stimulation array,
an overall rating of swallowing capability and current swallowing
effectiveness, respiratory capacity and capability, or degree of
oral motor muscle control (depending on the type of treatment), and
the current setting(s) of the stimulation pattern frequency and/or
intensity. Additionally, the display 610 may be adapted for
monitoring by the patient to provide feedback to the patient as to
how well swallowing has been completed. This feedback to the
patient may assist with the patient's inherent bio-feedback
mechanisms.
[0072] In the preferred embodiment depicted in FIG. 6, a
data/software I/O interface 609 is optionally provided to enable
downloading of testing data collected and processed by stimulation
device 600, for example, during patient treatments.
Patient-specific data may be downloaded to external devices,
including portable devices, through any conventional interface
(e.g., a hardwired interface, coaxial interface, infrared
interface, etc.).
[0073] Treatment of Oropharyngeal Disorders
[0074] A preferred embodiment of a bi-directional electrode array
607 for use in conjunction with stimulation device 600 for
treatment of oropharyngeal disorders is illustrated in FIG. 7. Each
bi-directional electrode in array 607 stimulates one or more
pharyngeal muscles with electrical stimulation provided by the
switching network 602, detects the electromyographic (EMG) response
from the stimulated muscle(s), and provides the EMG response as an
electrical feedback signal to the switching network 602.
[0075] Notably, the arrangement of electrodes and connecting wires
shown in FIG. 7 is provided as an example and is not intended to
limit the scope of the present invention. Uni-directional
electrodes (stimulating muscles but not sensing EMG signals from
the stimulated muscles) may also be used in accordance with the
present invention. Also, multiple electrodes, including squares of
four, sixteen, twenty-five, or thirty-six electrodes or more, may
be used. As the number of electrodes increases, the surface area
treated by the array may be increased and/or the electrodes may be
more closely positioned.
[0076] As shown in FIG. 7, array 607 preferably comprises
bi-directional four electrodes 701, 702, 703 and 704, which are
positioned on the tissue of the pharyngeal region of a patient
using adhesive bands 705 and 706 as illustrated in FIG. 7A or with
circular adhesive regions surrounding each metal electrode. The
electrodes may preferably be arranged in two pairs or in a vertical
row of four electrodes. In yet other preferred embodiments (not
shown), alternative electrode arrangements may be used to achieve
elevation of the patient's larynx.
[0077] In the two-pair electrode arrangement, each pair of
electrodes (701, 703) is positioned on one lateral side (e.g., the
right hand or left hand side) of the pharyngeal region of the
patient, with one electrode positioned above the patient 's Adams
Apple and the other below the Adams Apple of the patient. The
second pair of electrodes (702, 704) is positioned in the same
arrangement on the opposite side of the patient's pharyngeal
region. Each pair of electrodes may preferably be positioned such
that the distance between the centers of the electrodes, shown as
distance "X" in FIG. 7, may be approximately three to four
centimeters or other spacing as required to position the electrodes
on the pharyngeal region of the patient as described above. The
pairs of electrodes may preferably be spaced at a distance, shown
as distance "Y" in FIG. 7, of approximately two and a half
centimeters or other spacing as required to position the electrodes
on the pharyngeal region of the patient as described above. In the
two-pair electrode arrangement described above, the two electrodes
(701, 703) positioned on one lateral side (e.g., right or left
side) of the patient's pharyngeal region are coupled to a first
output channel of the switching network 602, and the two electrodes
(702, 704) positioned on the other lateral side of the patient's
pharyngeal region are coupled to a second output channel of the
switching network 602.
[0078] In the vertical row electrode arrangement (not shown), the
four electrodes are positioned in a vertical row directly adjacent
to one another, but not overlapping, starting with a first
uppermost electrode being positioned on the patient's digastric
muscles, covering the hyoid and the strap muscles of the patient's
larynx, and ending with a fourth lowermost electrode being
positioned at the base of the patient's thyroid cartilage. In the
vertical row electrode arrangement described above, the two upper
electrodes in the row are coupled to a First output channel of the
switching network 602, and the two lower electrodes in the row are
coupled to a second output channel of the switching network
602.
[0079] The electrodes 701, 702, 703 and 704 may preferably be snap
electrodes having the following approximate dimensions: an
eleven-millimeter diameter circular metal snap electrode positioned
on an adhesive band as shown in FIG. 7A or using a circular
adhesive pad for each electrode having an approximate radius of two
millimeters greater than that of the electrode for adult
applications. A three-eighths inch diameter circular metal snap
electrode affixed with an adhesive band, strips of adhesive tape,
or a circular adhesive pad for each electrode having an approximate
radius two-millimeters greater than that of the electrode may be
used for child applications. The electrodes 701-704 may also be any
suitably conventional and convenient shape that is suited for
physiological applications.
[0080] The adhesive bands used to attach each pair of electrodes in
array 607 to the patient may have a width of approximately eight
centimeters, shown as distance "A" in FIG. 7. Contact pads 707 and
708 having a width of approximately eight and a half centimeters
(shown as distance "B" in FIG. 7) are also provided.
[0081] The adhesive portions may be preferably made of a
conventional conductive skin adhesive such as a polyethylene-glycol
polymer. Because the conductivity of such adhesives may be
dependent on the water content in the polymer, the addition of a
small amount of salt may further aid conduction by the adhesive.
For child applications, hi-tack versions of the adhesive are
preferred because of the small contact area. Other suitable
adhesive materials may also be used as would be apparent to those
of skill in the art.
[0082] In a preferred embodiment, each electrode of electrode array
607 is independently coupled to an output of switching network 602
(shown in FIG. 6) by lead wires 710, 711, 712, and 713
respectively. As a result, each electrode independently receives
one or more series of electrical pulses generated by one or more of
pulse generators 603-606 via switching network 602 as determined by
microprocessor 601. Microprocessor 601 controls the switching
operation of switching network 602 to control which output or
outputs from pulse generators 603-606 are provided to each
electrode in electrode array 607.
[0083] Several alternative two-electrode arrangements for the
placement of electrodes on the tissue of the pharyngeal region of a
patient will now be described in detail with reference to FIGS. 3,
4 and 7. These arrangements are provided as examples of electrode
placement and are not intended to limit the number and arrangement
of electrodes for use in practicing the present invention.
[0084] The electrodes are selectively placed in any suitable site
within the pharyngeal region 200 of the patient as shown in FIGS.
3, 4 and 7. The placement of the electrodes in the pharyngeal
region of the patient is based on several factors, such as the
extent and type of oropharyngeal disorder exhibited by the patient
and, given the extent and type of oropharyngeal disorder exhibited,
those locations within the pharyngeal region, when subjected to
electrical stimulus, have the possibility of eliciting the
strongest and most complete swallow. An evaluation for swallowing
ability is done on the patient to determine the extent and type of
oropharyngeal disorder. The critical elements in the evaluation are
analysis by video fluoroscopy and clinical evaluation to determine
the presence of a gag reflex, a dry swallow, and ability to
tolerate one's own secretions. The placement of the electrodes may
be changed several times in an effort to obtain the strongest and
most effective treatment.
[0085] In a two-electrode embodiment of the present invention, a
pair of electrodes 202 is positioned on the skin of the pharyngeal
region 200 at approximately the position of the lesser horn 204 of
the hyoid bone 206 on either side of the pharyngeal region 200 and
just above the body of the hyoid bone 206. The electrodes overlie
the muscles of the floor of the mouth (not shown).
[0086] In an alternative two-electrode embodiment of the present
invention, a pair of electrodes 208 is positioned on the side of
the pharyngeal region 200 on one side of the midline of the
pharyngeal region 200. One electrode 208a is placed on the
thyrohyoid membrane 210 at approximately the level of the lesser
horn 204 close to the hyoid bone 206. This electrode 208a overlies
the sternothyroid muscle 212 and the thyrohyoid muscle 214. The
other electrode 208b is placed on the cricoid cartilage 216 to the
side of the midline of the pharyngeal region 200. This electrode
overlies the sternothyroid muscle 218 and the sternothyroid muscle
212 on one side of the midline of the pharyngeal region.
[0087] In another embodiment of the present invention, a pair of
electrodes 220 is positioned on the skin of the pharyngeal region
200 on the thyrohyoid membrane 210 on either side of the midline of
the pharyngeal region 200. These electrodes overlie the thyrohyoid
muscle 214 and the sternothyroid muscle 218.
[0088] In yet another embodiment of the present invention, a pair
of electrodes 222 is positioned on the skin of the pharyngeal
region 200 on either side of the midline of the pharyngeal region
200 proximately midway between the thyroid notch 224 and the
cricoid cartilage 216. These electrodes overlie the sternothyroid
muscle 218 and the transition zone between the sternothyroid muscle
212 and the thyrohyoid muscle 214 on either side of the midline of
the pharyngeal region 200.
[0089] In an additional embodiment of the present invention, a pair
of electrodes 226 is positioned on the skin of the pharyngeal
region 200 on one side of the midline of the pharyngeal region 200.
One electrode 226a is placed just lateral to the lesser horn 204 of
the hyoid bone 206 proximately midway between the hyoid bone 206
and the lower border of the mandible (not shown). This electrode
overlies the mylohyoid muscle 228 and the digastric muscle 230. The
other electrode 226b is placed proximate to the upper end of the
thyrohyoid membrane 210 and proximate to the hyoid bone 206 or on
the hyoid bone 206 proximately at the level of the lesser horn 204
of the hyoid bone 206. This electrode overlies the sternothyroid
muscle 212 and the thyrohyoid muscle 214.
[0090] In a further embodiment of the present invention, a pair of
electrodes 232 is positioned on the skin of the pharyngeal region
200 to the side of the midline of the pharyngeal region 200. One
electrode 232a is placed on the midline of the pharyngeal region
near the chin (not shown). The other electrode 232b is placed
laterally to the other electrode. These electrodes overlie the
mylohyoid muscle 228 and the digastric muscle 230 in the midline
and to one side of the midline of the pharyngeal region 200.
[0091] In general, the placement and dimensions of the electrodes
in accordance with the present invention is performed so as to
avoid the carotid body and to insure the safety of the patient.
[0092] A preferred method for electrical pharyngeal neuromuscular
stimulation using the apparatus shown in FIG. 1 will now be
described with reference to FIG. 2. Turning to start procedure step
100, the procedure for treating oropharyngeal disorders with
electrical stimulation is initiated. Next, at apply electrodes to
patient step 102, actual electrodes are applied to the pharyngeal
area of a patient. The particulars for electrode placement and
selection are described in detail below with reference to FIGS. 3,
4 and 7.
[0093] Turning next to set pulse frequency step 104, a pulse
frequency is set in accordance with the parameters disclosed above.
Similarly, at set pulse duration step 106, pulse duration is set.
Finally, at determine treatment time step 108, a determination of a
treatment duration is made, as well as to the number of treatment
periods that are to be applied.
[0094] Turning next to apply waveform step 110, an actual waveform
associated with the previously selected parameters is applied to
the pharyngeal area of a patient. Next, at decision step 112, a
determination is made as to whether a treatment period is complete
in accordance with the preselected standards. A positive
determination causes progress to decision step 114 and a negative
determination causes progress to wait for duration step 116. At
wait for duration step 116, the device automatically waits for a
predetermined period of time before returning to apply waveform
step 110.
[0095] At decision step 114, a determination is made as to whether
further treatment periods are merited. A positive determination
causes a return to wait set duration step 110. A negative
determination results in completion of the treatment procedure as
indicated by end procedure step 118.
[0096] With reference to FIG. 8, an alternative embodiment of a
preferred method for electrical pharyngeal neuromuscular
stimulation according to the present invention includes the steps
of:
[0097] 801: generating a series of electrical pulses using one or
more pulse generators;
[0098] 802: generating operation control signals to control
operation of the pulse generators;
[0099] 803: receiving the series of electrical pulses from the
pulse generators at a switching network;
[0100] 804: generating switching control signals to control
operation of the switching network;
[0101] 805: outputting the series of electrical pulses from the
switching network in accordance with the switching control
signals;
[0102] 806: applying the series of electrical pulses to tissue of a
pharyngeal region of a patient using an electrode array to achieve
neuromuscular stimulation of a patient;
[0103] 807: generating electrical feedback signals in response to
the neuromuscular stimulation of the patient;
[0104] 808: generating test data in response to the electrical
feedback signals; and
[0105] 809: modifying the operation control signals and switching
control signals in response to the electrical feedback signals.
[0106] This method may further include the step of:
[0107] 810: generating physiological and/or non-physiological input
signals using at least one physiological and/or non-physiological
input device.
[0108] When step 810 is included, the test data generated in step
808 above is also based upon the physiological and/or
non-physiological input signals. Similarly, step 809 above includes
the modification of the operation control signals and switching of
control signals in response to both the electrical feedback signals
and the physiological and/or non-physiological input signals.
[0109] The preferred method depicted in FIG. 8 may optionally
include the steps of monitoring the electrical feedback signals,
the physiological input signals, the non-physiological input
signals, or any combination thereof and downloading the test data
to a test data receiver, for example, an external receiving
device.
[0110] The practice of various embodiments of the method according
to the present invention will now be described in further detail.
In the following examples, the inventive method was used to treat
dysphagia. These examples are not intended to limit the scope of
the present invention.
EXAMPLE 1
[0111] One hundred and ninety-five patients suffering from
dysphagia as a result of a stroke or neurodegeneration were
studied. The swallowing ability of each patient was evaluated to
determine the extent and type of dysphagia exhibited by the
patient. The swallowing ability of each patient was assigned a
number which corresponds to a defined swallow state wherein the
swallow states are listed below: swallow state zero is the
inability to have a pharyngeal contraction; swallow state one is
the ability to swallow one's own secretions; swallow state two is
the ability to swallow paste, pudding, or similar substances;
swallow state three is the ability to swallow honey or similar
substances; swallow state four is the ability to swallow nectar or
similar substances; swallow state five is the ability to swallow
liquids; and swallow state six is the ability to swallow water. All
of the patients were determined to have swallowing states of either
zero or one, indicating the patient did not have a complete
pharyngeal contraction and had no gag reflex or the ability to
handle secretions. The patients were then objected to a series of
treatment sessions. The patients were divided into two treatment
groups: electrical stimulation and thermal stimulation.
[0112] Sixty three patients underwent a series of electrical
stimulation treatment sessions. Preferably, the patients underwent
a least seven electrical stimulation treatment sessions. In each
treatment session, electrodes were selectively placed on the skin
of the pharyngeal region of the patient. The placement of the
electrodes was determined by the extent and type of dysphagia
exhibited by the patient and, given the extent and type of
dysphagia exhibited, those locations within the pharyngeal region,
when subjected to electrical stimulus, have the possibility of
eliciting the strongest and most complete swallow. Electrode
placement was adjusted until the patient achieved the most complete
swallowing contraction for which he was capable. Once the correct
electrode placement was determined, the intensity of the current
was increased by small increments until the tolerance and comfort
level limits are reached in the patient. The optimal intensity was
realized when the patient felt a tugging or pinch in the area of
stimulation. The patient was then subjected to continuous
electrical stimulation wherein electric pulses were continuously
generated and delivered to the electrodes until a complete swallow
was achieved or the tolerance level was reached in the patient.
This step was repeated five to twenty times in each treatment
session wherein the patient was subjected to continuous electrical
stimulation. If the electrical stimulation was successful in
promoting a complete contraction, swabbing of the oral cavity was
done and the patient attempted a dry swallow. In those patients who
did not exhibit any pharyngeal contraction, one or more treatment
sessions were required before an adequate dry swallow occurred.
[0113] Once an adequate dry swallow was achieved, oral intake was
provided to assist in the treatment. The consistency of the oral
intake was determined by the strength of the contraction elicited
by the patient. If the patient was able to swallow his own saliva,
swabbing the oral cavity with a sponge moistened by water or juice
was performed. The patient attempted to swallow the water or juice
while subjected to continuous electrical stimulation. Once the
patient had achieved audible, strong contractions, the patient was
challenged with pudding, thick liquid, or ice slush. The patient
attempted to swallow these substances while subjected to continuous
electrical stimulation. Once three to five strong swallows were
achieved with the assistance of electrical stimulation, the patient
attempted to swallow these substances without the assistance of
electrical stimulation. Treatment sessions continued with each
patient until the patient's improvement reached a plateau.
[0114] Thirty-one patients were subjected to a series of thermal
stimulation treatment sessions. Preferably, the patients were
subjected to a least seven thermal stimulation treatment sessions.
In each treatment session, a mirror or probe was immersed in ice or
cold substance. The tonsillar fossa was stimulated with the mirror
or probe. The patient then closed his mouth and attempted a dry
swallow. If the stimulation was successful in promoting a complete
contraction, oral intake was provided to assist in the treatment.
The consistency of the oral intake was determined by the strength
of the contraction elicited by the patient. Once an adequate dry
swallow was achieved, oral intake was provided to assist in the
treatment. The consistency of the oral intake was determined by the
strength of the contraction elicited by the patient. If the patient
was able to swallow his own saliva, swabbing the oral cavity with a
sponge moistened by water or juice was performed. The patient
attempted to swallow the water or juice while subjected to thermal
stimulation. Once the patient had achieved audible, strong
contractions, the patient was challenged with pudding, thick
liquid, or ice slush. The patient attempted to swallow these
substances while subjected to thermal stimulation. Once three to
five strong swallows were achieved with the assistance of thermal
stimulation, the patient attempted to swallow these substances
without the assistance of thermal stimulation. Treatment sessions
continued with each patient until the patient's improvement
plateaus. Once the patient had achieved audible, strong
contractions, the patient was challenged with pudding, thick
liquid, or ice slush. The patient attempted to swallow these
substances while subjected to continuous electrical stimulation.
Once three to five strong swallows were achieved with the
assistance of electrical stimulation, the patient attempted to
swallow these substances without the assistance of thermal
stimulation. Treatment sessions continued with each patient until
the patient's improvement plateaus.
[0115] The effectiveness of the electrical stimulation treatments
and the thermal stimulation treatments is shown in FIG. 5. FIG. 5
is a graph illustrating the mean swallowing state achieved after
electrical stimulation treatment sessions and thermal stimulation
treatments. After seven treatment sessions, the mean swallowing
state of the patients treated with electrical stimulation was
swallow state five, or the ability to swallow thin liquids. After
seven treatment sessions, the mean swallowing state of the patients
treated with thermal stimulation was only swallow state one, or the
ability to handle one's own secretions.
[0116] The method and device for electrical pharyngeal
neuromuscular stimulation of the present invention provides an
effective and non-invasive treatment for dysphagia. The method and
device for electrical pharyngeal neuromuscular stimulation is more
effective for treating dysphagia than traditional treatment
methods, such as thermal stimulation. Further, the method and
device of the present invention is effective for treating
worst-case dysphagia resulting from neurodegeneration and
strokes.
[0117] Treatment of Respiratory Disorders
[0118] The device described above with reference FIGS. 1 and 6
above may further be used to treat respiratory disorders, such as
asthma, bronchitis, and chronic obstructive pulmonary disease, and
to treat ventilator dependence conditions by providing electrical
neuromuscular stimulation to the intercostal muscles between the
ribs of a patient.
[0119] The electrodes used in treatment of respiratory disorders
are preferably unidirectional or bi-directional snap electrodes
having an eleven-millimeter diameter circular metal snap electrode
surrounded by an annular adhesive portion approximately two
millimeters wide may be used for adult applications. A
three-eighths inch diameter circular metal snap electrode affixed
to the patient using strips of adhesive tape or using a circular
adhesive pad for each electrode having an approximate radius of two
millimeters greater than that of the electrode may be used for
adult applications. A three-eighths inch diameter circular metal
snap electrode affixed with strips of adhesive tape or with a
circular adhesive pad for each electrode having an approximate
radius two-millimeters greater than that of the electrode may be
used for child applications. The adhesive portions are preferably
made of a conventional conductive skin adhesive such as a
polyethylene-glycol polymer. Because the conductivity of the
adhesive is dependent on the water content in the polymer, the
addition of a small amount of salt will further aid conduction by
the adhesive. For child applications, hi-tack versions of the
adhesive are preferred because of the small contact area. However,
the electrodes may also be any suitably conventional and convenient
shape that is suited for physiological applications.
[0120] Various exemplary electrode configurations will now be
described with reference to FIGS. 9A-E. These arrangements are
provided as examples of electrode placement and are not intended to
limit the number and arrangement of electrodes for use in
practicing the present invention.
[0121] According to a preferred embodiment of the present
invention, treatment of respiratory disorders such as asthma and
asthma-type symptoms may be performed by placing one
uni-directional circular snap electrode on the intercostal muscle
between the patient's third and fourth anterior ribs and one
uni-directional circular snap electrode on the intercostal muscle
between either the patient's fourth and fifth or fifth and sixth
anterior ribs. Both electrodes are positioned on the same side
(left or right side, depending on the patient's condition) of the
patient, applying a total of two circular uni-directional snap
electrodes (901 and 902) in this embodiment, as shown in FIG. 9A
(showing left side placement only). Each electrode is placed in
proximity to, but not touching, the patient's sternum.
[0122] According to another preferred embodiment of the present
invention, treatment of respiratory disorders may be performed by
placing one bi-directional circular snap electrode on the
intercostal muscle between the patient's third and fourth anterior
ribs on each side of the patient and one bi-directional circular
snap electrode on the intercostal muscle between either the
patient's fourth and fifth or fifth and sixth anterior ribs on each
side of the patient. Thus, a total of four circular bi-directional
snap electrodes (903, 904, 905 and 906) are applied in this
embodiment, as shown in FIG. 9B. Each electrode is placed in
proximity to, but not touching, the patient's sternum.
[0123] According to yet another preferred embodiment of the present
invention, treatment of ventilator dependence conditions may be
performed by placing one bi-directional rectangular two-inch snap
electrode in the intercostal space between the patient's seventh
and eighth anterior ribs on each side of the patient and one
bi-directional rectangular two-inch snap electrode in the
intercostal space between the patient's eighth and ninth anterior
ribs on each side of the patient. Thus, a total of four rectangular
bi-directional snap electrodes (910, 911, 912, and 913) are applied
in this embodiment, as shown in FIG. 9C.
[0124] According to another preferred embodiment of the present
invention, treatment of respiratory disorders such as bronchitis
and chronic obstructive pulmonary disorder (COPD) may be performed
by placing one uni-directional circular snap electrode on the
intercostal muscle between the patient's second and third anterior
ribs and one uni-directional circular snap electrode on the
intercostal muscle between the patient's third and fourth anterior
ribs. Both electrodes are placed on the same side (either the right
or left side, depending on the patient's condition) of the patient.
Thus, a total of two circular uni-directional snap electrodes (914
and 915) are applied in this embodiment, as shown in FIG. 9D
(showing left side placement only). Each electrode is placed in
proximity to, but not touching, the patient's sternum.
[0125] According to another preferred embodiment of the present
invention, treatment of respiratory disorders such as bronchitis
and COPD may be performed by placing one bi-directional circular
snap electrode on the intercostal muscle between the patient's
second and third anterior ribs on each side of the patient and one
bi-directional circular snap electrode on the intercostal muscle
between the patient's third and fourth anterior ribs on each side
of the patient. Thus, a total of four circular bi-directional snap
electrodes (916, 917, 918 and 919) are applied in this embodiment,
as shown in FIG. 9E. Each electrode is placed in proximity to, but
not touching, the patient's sternum.
[0126] Other arrangements and placements of electrodes may also be
used in accordance with the present invention as would be apparent
to those of skill in the art. As illustrated in FIG. 10, a method
for treating respiratory disorders according to the present
invention using the electrical neuromuscular stimulator shown in
FIG. 1 includes the Following steps:
[0127] 1001: applying electrodes to the intercostal regions of a
patient as described above with reference to FIGS. 9A-E.
[0128] 1002: setting a pulse frequency in accordance with the
parameters disclosed above with reference to FIG. 1.
[0129] 1003: setting a pulse duration.
[0130] 1004: setting a treatment duration, as well as to the number
of treatment periods that are to be applied.
[0131] 1005: applying a waveform associated with the previously
selected parameters to the intercostal regions of the patient as
described above with reference to FIGS. 9A-E.
[0132] 1006: determining whether a treatment period is complete in
accordance with preselected standards.
[0133] 1007: a positive determination causes progress to decision
step 1010.
[0134] 1008: a negative determination causes the device to wait for
a duration as defined in step 1009.
[0135] 1009: pausing for a predetermined period of time before
returning to apply waveform step 1005.
[0136] 1010: determining whether further treatment periods are
merited. A positive determination causes a return to wait for
duration step 1009. A negative determination results in completion
of the treatment procedure as indicated by end procedure step
1011.
[0137] As shown in FIG. 11, an alternative method for treating
respiratory disorders according to the present invention using the
electrical neuromuscular stimulator shown in FIG. 6 includes the
following steps:
[0138] 1101: generating a series of electrical pulses using one or
more pulse generators;
[0139] 1102: generating operation control signals to control
operation of the pulse generators;
[0140] 1103: receiving the series of electrical pulses from the
pulse generators at a switching network;
[0141] 1104: generating switching control signals to control
operation of the switching network;
[0142] 1105: outputting the series of electrical pulses from the
switching network in accordance with the switching control
signals;
[0143] 1106: applying the series of electrical pulses to tissue of
at least one intercostal region of a patient and using an electrode
array as described above with reference to FIGS. 9A-E to achieve
neuromuscular stimulation of the patient;
[0144] 1107: generating electrical feedback signals in response to
the neuromuscular stimulation of the patient;
[0145] 1108: generating test data in response to the electrical
feedback signals; and
[0146] 1109: modifying the operation control signals and switching
control signals in response to the electrical feedback signals.
[0147] This method may further include the step of:
[0148] 1110: generating physiological and/or non-physiological
input signals using at least one physiological and/or
non-physiological input device.
[0149] When step 1110 is included, the test data generated in step
1108 above is also based upon the physiological and/or
non-physiological input signals. Similarly, step 1109 above
includes the modification of the operation control signals and
switching of control signals in response to both the electrical
feedback signals and the physiological and/or non-physiological
input signals.
[0150] The preferred method depicted in FIG. 11 may optionally
include the steps of monitoring the electrical feedback signals,
the physiological input signals, the non-physiological input
signals, or any combination thereof and downloading the test data
to a test data receiver, for example, an external receiving
device.
[0151] Treatment of Oral Motor Neuromuscular Damage and
Disorders
[0152] The device described above with reference FIGS. 1 and 6
above may further be used to treat oral motor neuromuscular damage
and disorders by providing electrical neuromuscular stimulation at
specific oral motor points on the face of a patient.
[0153] The electrodes used in treatment of oral motor neuromuscular
disorders are preferably uni-directional or bi-directional snap
electrodes having an eleven-millimeter diameter circular metal snap
electrode surrounded by an annular adhesive portion approximately
two millimeters wide may be used for adult applications. A
three-eighths inch diameter circular metal snap electrode affixed
to the patient using strips of adhesive tape or using a circular
adhesive pad for each electrode having an approximate radius of two
millimeters greater than that of the electrode may be used for
adult applications. A three-eighths inch diameter circular metal
snap electrode affixed with strips of adhesive tape or with a
circular adhesive pad for each electrode having an approximate
radius two-millimeters greater than that of the electrode may be
used for child applications. The adhesive portions are preferably
made of a conventional conductive skin adhesive such as a
polyethylene-glycol polymer: Because the conductivity of the
adhesive is dependent on the water content in the polymer, the
addition of a small amount of salt will further aid conduction by
the adhesive. For child applications, hi-tack versions of the
adhesive are preferred because of the small contact area. However,
the electrodes may also be any suitably conventional and convenient
shape that is suited for physiological applications.
[0154] Various exemplary electrode configurations will now be
described with reference to FIG. 12. These arrangements are
provided as examples of electrode placement and are not intended to
limit the number and arrangement of electrodes for use in
practicing the present invention.
[0155] With reference to FIG. 12, treatment of oral motor
neuromuscular damage and/or disorders may be performed by placing
one uni-directional circular snap electrode in front of the Targus
and the Tempro Mandibular Joint. A second uni-directional circular
snap electrode is placed overlying the neck of the mandible at the
N. Facial (Trunk). Thus, a total of two circular uni-directional
snap electrodes (1201 and 1202) are applied to the oral motor
region on one side of the patient's face (either the left or right
side, depending on the patient's condition).
[0156] An alternative treatment (not shown) of oral motor
neuromuscular damage and/or disorders may be performed by placing
one bi-directional circular snap electrode in front of the Targus
and the Tempro Mandibular Joint on each side of the patient's face
and one bi-directional circular snap electrode overlying the neck
of the mandible at the N. Facial (Trunk) on each side of the
patient's face. Thus, a total of four circular bi-directional snap
electrodes are applied to the patient's oral motor region in this
embodiment.
[0157] As shown in FIG. 13, a method for treating oral motor
neuromuscular damage and/or disorders according to the present
invention using the electrical neuromuscular stimulator shown in
FIG. 1 includes the following steps:
[0158] 1300: initiating the procedure for treating respiratory
disorders with electrical stimulation.
[0159] 1301: applying electrodes to the tissue of the oral motor
region of a patient as described above with reference to FIG.
12.
[0160] 1302: setting a pulse frequency in accordance with the
parameters disclosed above with reference to FIG. 1.
[0161] 1303: setting a pulse duration.
[0162] 1304: setting a treatment duration is made, as well as to
the number of treatment periods that are to be applied.
[0163] 1305: applying a waveform associated with the previously
selected parameters to the face of the patient as described above
with reference to FIG. 12.
[0164] 1306: determining whether a treatment period is complete in
accordance with preselected standards.
[0165] 1307: a positive determination causes progress to decision
step 1310.
[0166] 1308: a negative determination causes the device to wait for
a duration determined in step 1309.
[0167] 1309: pausing for a predetermined period of time before
returning to apply waveform step 1305.
[0168] 1310: determining whether further treatment periods are
merited. A positive determination causes a return to wait for
duration step 1309. A negative determination results in completion
of the treatment procedure as indicated by end procedure step
1312.
[0169] As shown in FIG. 14, an alternative method for treating oral
motor neuromuscular damage and/or disorders according to the
present invention using the electrical neuromuscular stimulator
shown in FIG. 6 includes the following steps:
[0170] 1401: generating a series of electrical pulses using one or
more pulse generators;
[0171] 1402: generating operation control signals to control
operation of the pulse generators;
[0172] 1403: receiving the series of electrical pulses from the
pulse generators at a switching network;
[0173] 1404: generating switching control signals to control
operation of the switching network;
[0174] 1405: outputting the series of electrical pulses from the
switching network in accordance with the switching control
signals;
[0175] 1406: applying the series of electrical pulses to the face
of a patient using an electrode array as described above with
reference to FIG. 12 to achieve neuromuscular stimulation of a
patient;
[0176] 1407: generating electrical feedback signals in response to
the neuromuscular stimulation of the patient;
[0177] 1408: generating test data in response to the electrical
feedback signals; and
[0178] 1409: modifying the operation control signals and switching
control signals in response to the electrical feedback signals.
[0179] This method may further include the step of:
[0180] 1410: generating physiological and/or non-physiological
input signals using at least one physiological and/or
non-physiological input device.
[0181] When step 1410 is included, the test data generated in step
1408 above is also based upon the physiological and/or
non-physiological input signals. Similarly, step 1409 above
includes the modification of the operation control signals and
switching of control signals in response to both the electrical
feedback signals and the physiological and/or non-physiological
input signals.
[0182] The preferred method depicted in FIG. 14 may optionally
include the steps of monitoring the electrical feedback signals,
the physiological input signals, the non-physiological input
signals, or any combination thereof and downloading the test data
to a test data receiver, for example, an external receiving
device.
[0183] While various embodiments of a method and device for
treating oropharyngeal, respiratory, and oral motor neuromuscular
disorders with electrical stimulation have been disclosed, it
should be understood that modifications and adaptations thereof
will occur to persons skilled in the art. Other features and
aspects of this invention will be appreciated by those skilled in
the art upon reading and comprehending this disclosure. Such
features, aspects, and expected variations and modifications of the
reported results and examples, as well as their equivalents, are
clearly within the scope of the invention as described by the
following claims.
* * * * *