U.S. patent number 3,645,260 [Application Number 05/055,916] was granted by the patent office on 1972-02-29 for dental desensitizer.
This patent grant is currently assigned to Health Systems, Inc.. Invention is credited to Robert J. Barton, William R. Cinotti, Joseph Panico.
United States Patent |
3,645,260 |
Cinotti , et al. |
February 29, 1972 |
DENTAL DESENSITIZER
Abstract
A dental desensitizer apparatus which includes a hollow
dielectric housing having therein a source of electrical energy
connected to a current regulating means connected to and for
activating a lamp carried at one end of said housing. Said means
being operative to light said lamp only when the current output of
the regulating means is of a selected amperage. A translucent cover
closing said housing across said lamp and an oral operating
extension selectively separable from said housing attached to the
other end of said housing. Said extension being of a translucent
soft and flexible dielectric material and having formed therein a
pair of cavities each communicating with a separate porous
spongelike pad disposed on opposite sides of the tip of the
extension. Electrical connection is made between each of said pads
and the output of said regulating means.
Inventors: |
Cinotti; William R. (Glen
Ridge, NJ), Panico; Joseph (Arlington, MA), Barton;
Robert J. (Woburn, MA) |
Assignee: |
Health Systems, Inc. (Woburn,
MA)
|
Family
ID: |
22000999 |
Appl.
No.: |
05/055,916 |
Filed: |
July 17, 1970 |
Current U.S.
Class: |
604/20 |
Current CPC
Class: |
A61N
1/20 (20130101); A61C 19/06 (20130101); A61N
1/303 (20130101) |
Current International
Class: |
A61C
19/00 (20060101); A61C 19/06 (20060101); A61N
1/30 (20060101); A61N 1/20 (20060101); A61n
035/00 () |
Field of
Search: |
;128/172.1,172,404-406,410,303.1,24.1,407,409 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Mitchell; J. B.
Claims
We claim:
1. An electric electrolytic desensitizer and decay inhibitor which
comprises:
a hollow rigid dielectric body having supported therein,
a battery
a lamp directed outwardly and having one terminal thereof
detachably coupled to one terminal of said battery,
constant current regulating means having its power input terminals
connected across said battery and having a pair of output
terminals, the other terminal of said lamp connected to said
regulating means whereby when said regulating means are operative
said lamp will be ignited,
an oral operative extension of a flexible dielectric material
formed so as to provide therein a pair of cavities, and being
closed by a wall at one end,
the opposite end of said extension formed to converge toward a tip
portion,
a pair of applicators disposed on opposite faces of said tip
portion,
a pair of channels communicating directly between said applicators
and their respective said cavities,
electrical and support coupling means partially carried by said
extension and said body detachably coupling said oral extension
thereto, and electrically coupling said output terminals to said
applicators,
whereby when said extension is coupled to said body, said cavities
filled with a dental medicant electrolyte, and one of said
applicators disposed against a patient's tooth, a constant
selectable current will flow through said applicator, said
electrolyte, said tooth, patient's oral tissue and the other of
said applicators and said lamp will be ignited to indicate proper
operation.
2. The desensitizer according to claim 1 wherein said couplings
include:
a pair of pronglike electrodes supported in and extending out of
said body at the end opposite said lamp,
a pair of recesses in said wall of said extension mating with and
receiving said electrodes,
said recesses being provided with electrical contact means therein
contacting said electrodes,
electrically conducting means disposed intermediate said
applicators and said tip faces and connected to said electrical
contact means.
3. The desensitizer according to claim 2 wherein said current
regulating means comprises:
a pair of series connected resistors forming a divider network,
a second resistor
a first transistor having its base electrode connected to the
junction of said series resistors, and an emitter and collector
electrodes,
second and third transistors each having base, emitter and
collector electrodes,
a series loop path having connected therein
said series resistors
said second resistor
said emitter and collector electrodes of said first transistor
said output terminals,
said base and emitter of said second transistor and
said base and emitter of said third transistor,
said collectors of said second and third transistors connected to
the other terminal of said lamp,
said power input terminals connected across said series
resistors,
4. The desensitizer according to claim 3 wherein said second
resistor is a variable resistor for selectively adjusting the
current of said regulating means.
5. The desensitizer according to claim 4 wherein said applicators
are foamlike pads.
6. The desensitizer according to claim 5 further including a
detachable lens cap threaded into said body over said lamp.
7. The desensitizer according to claim 6 wherein said body and said
extensions are circular in cross section.
8. The desensitizer according to claim 7 further including a
circuit board having connected and supported thereon said
regulating means components,
said body being provided with a pair of opposed grooves and
supporting therein said circuit board.
9. The desensitizer according to claim 8 wherein said tip is
Y-shaped and said applicator are carried by the arms of said
Y-shaped tip and directed outwardly.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to oral and dental instruments and
apparatus and more particularly pertains to electrical
desensitization of the teeth in conjunction with fluoride solutions
wherein the oral current supplied is regulated and proper operation
is visually indicated.
2. Description of the Prior Art
In the field of electrical dental desensitization, it has been the
general practice to employ a separate apparatus for providing the
electrical energy after the fluoride solution has been applied to
the teeth without any control over the applied current. This
procedure not only requires two separate operations but generally
necessitates the presence of at least a dental technician.
Additionally, it is apparent that the activating current must pass
through a good portion of the patients body thus limiting its
control and effectiveness without any indication of proper
operation. Since it is necessary to provide an electrical current
to ionize the fluoride, which, serves as the electrolyte, this
being established through the patient, a definite psychological
difficulty is created in that the patient is aware of the
electrical energy passing through his body. This suggests, in the
patients mind, the feeling of pain and discomfort and precludes any
relaxation on his part during the desensitization procedure.
Applicants apparatus overcomes these problems by providing a
regulated self-contained unit which also indicates proper operation
and restricts the electrical energy to the oral area.
SUMMARY OF THE INVENTION
The general purpose of this invention is to provide an improved
dental desensitizer that has all the advantages of similarly
employed prior art devices and has none of the above described
disadvantages. To attain this, the present invention provides a
unique arrangement, structure and current regulating circuit in
which the source of electrical energy and the regulating means are
housed in a hollow dielectric body having connected at one end an
indicating lamp which is activated only when the proper current is
being applied to the patient. Separably connected at the opposite
end of the body is an operating extension which carries an oral tip
provided with a pair of opposed porous pads which, independently
communicates, with two cavities formed within the extension. The
extension is of a soft deformable, translucent dielectric material
and provides a passage there through for electrical connection
between the pads and the regulating means. When the cavities are
filled with a fluoride solution or paste and the extension
compressed by the fingers of the patient, while in his mouth, a
small amount of solution will fill the pads. One of the pads will
be in direct contact with the dentine of the patients tooth while
the other will directly engage the inner surface of the cheek,
lips, tongue or jaw so as to provide a short, low resistance
internal path with positive electrical contact.
An object of the present invention is to provide a reliable,
simple, inexpensive, efficient, compact, lightweight,
self-contained electrolytic dental desensitizer.
Another object is the provision of a dental desensitizer having a
constant regulated current supply with a visual indication of
proper operation.
Still another object is to provide a dental desensitizer which may
be readily operated by the patient and in which the supply of
fluoride solution is also controlled by the patient.
A further object is to provide a dental desensitizer wherein the
operating contract portion containing the fluoride solution is
easily replaceable.
A still further object is the provision of a dental desensitizer
which is hand held and in which the entire electrical path is
within the oral area for minimizing the circuit resistance.
Other objects and many of the attendant advantages of this
invention will be readily appreciated as the same becomes better
understood by reference to the following detailed description when
considered in connection with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of an embodiment made in
accordance with the principle of the present invention;
FIG. 2 is another cross-sectional view taken approximately along
line 2--2 of FIG. 1,
FIG. 3 is a cross-sectional view taken approximately along line
3--3 of FIG. 1,
FIG. 4 is a cross-sectional view taken approximately along line
4--4 of FIG. 1;
FIG. 5 is a cross-sectional view taken approximately along line
5--5 of FIG. 1; and
FIG. 6 is a schematic of the electronic current regulating and
indicating circuits employed in the embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the illustrated embodiment of FIGS. 1 through 5, a hollow
housing or body 10 of a relatively rigid, dielectric, molded
plastic such as ABS or polyethylene has disposed therein a source
of electrical energy such as a battery 11 and a printed circuit
board 12 which also includes various electrical components. The
circuit board 12 is supported within the housing by a pair of
longitudinal grooves 13 (see FIG. 3) formed by the body wall into
which it slides while similar recesses can be provided for the
battery 11 where necessary which is electrically coupled to the
board by spring contact 14 at battery terminal 14'. The board
components are, where necessary, connected to the spring contact 14
through a metal runner 15 carried along the edges of the board and
embedded therein. Disposed at the rear end of the housing
proximate, and in electrical spring contact with the other terminal
16 of the battery is a lamp holder 17 which carries lamp 18.
Internal threads 19 on the rear end of the housing permit the
mounting of the threaded translucent lens cap 20 over the lamp 18
as well as closing the end of the housing. The opposite housing end
is closed by an end wall 21 into which are embedded coupling
contacts 22 and 23 and through which they pass and are supported
therein, a pair of metallic electrode plugs 24, 25 are integral
with the couplings and extend outwardly thereof. These plugs are
electrically connected via the couplings 22', 23' to the forwarded
runners 26 and 27 against which they tightly and slidably abut
within the grooves for connection to the board 12 so as to couple
to the current output thereof. Wires 28,29 which may be molded into
the housing serve to connect the board to both the opposite end of
the battery and the lamp for completion of the circuit. Wire 29
connects the lamp base 30 to the battery terminal 14' via the
spring base 31, ring contact 32, runner 15 and spring contact 14.
The board is connected to terminal 16 through the lamp spring
contact 33, base contact 34 and ring 35, wire 28 and board runner
26'. These parts are securely held in position when the lens cap 20
is threaded into the body since they are compressed between the
body shoulder 37 and the cap shoulder 38.
A separable and replaceable extension 39 which is provided with a
pair of inwardly extending recess 40, 40' that are formed as part
of the rear wall 41 thereof to receive and mate with the plugs 24,
25, is carried by and affixed to the body or housing. The innermost
portion of each of the recesses is provided with coupling means as
for example, a metallic sleeve 42, 43, from which wires 44,45
extend through tubular openings 46,47 in extension divider 48. The
central divider 48 separates the extension into two parts to form
with the outer shell a pair of cavities 49,50. Since the extension
terminates in an oral operating tip 51 to be placed in the patients
mouth, its general configuration is one such that proximate the tip
it is quite narrow crosswise but Y-shaped in the perpendicular
plane so as to provide spaced faces 51' and 51". Disposed on and
supported by the tip faces 51' and 51" are a pair of opposed,
spaced-apart, foam rubber, spongelike pads 52,53 which are in
direct communication with their respective cavities through
communicating channels 54,55 so as to be accessible to sodium
fluoride solution 56 or paste or any other suitable dental formula
within the cavities. Since the outer shell of the extension 39 is
formed of any suitable soft, flexible, deformable, dielectric
material, the compression of the cavities, as by the patients
fingers, will force the paste into the pads. Disposed intermediate
the tip and each of the pads and in intimate contact therewith is a
metallic coupler 57,58 which terminates the wire 44, 45 so that the
board current output is connected thereto. Thus it is clear that a
complete circuit connection exists between the output leads of the
circuit board 12 and each of the pads whereby when the operating
tip is placed in the patients mouth with one pad in contact with
the dentine or cementum the opposite pad will be against some
tissue portion of the mouth, usually the inner surface of the
cheek. Since the pads are spread apart as illustrated, the liquids
in the patients mouth will not short circuit the path directly
between the pads. Low resistance is thereby maintained between the
electrodes or pads. It should be observed that for operability only
one of the pads (on dentine) need be supplied with the fluoride
but, as a practical matter, since both sides of front and back
teeth should be readily accessible without excessive manipulation
both pads are activated. With the extension replaceable and the tip
portion extremely flexible due in part to its small cross section
intermediate the tip and the wall 41, the device is extremely
versatile and easily employed. Additionally, it should be noted
that the polarity of the pads could be reversed by merely reversing
the extension but, if it is to be fixed, the plugs could be
polarized by enlarging one of them. The electronic circuit of the
board 12 is fully illustrated in FIG. 6 where the battery 11 is
connected across a voltage divider consisting of series resistors
60 and 61 whose junction 63 is connected to the base 64 of
transistor 65 so as to provide a constant fixed base bias. The
collector 66 of this transistor is connected to one of the plugs 25
and therefore effectively to one of the pads within the patients
mouth. The emitter 67 of the current control transistor 65 is
connected to negative side of the battery via variable emitter
resister 68 which can be of the fixed type where a set current is
desired. Transistors 69 and 70 in a Darlington configuration
provide the necessary DC current amplification and supply the
current to electrode 24 through the patient, collector 66, emitter
67, and resistor 68 from the battery. This current is effectively
controlled by the value of resistor 68 and kept constant by the
biases on transistor 65 and is independent of the battery voltage
and tooth impedances below 800,000 ohms. A suitable patient current
for desensitization has been found to be approximately 10
microamperes. Transistor 70 has its emitter 71 connected to the
positive battery terminal and its collector 72 in series with the
lamp 18 and battery negative. The base 73 of transistor 70 is tied
to the emitter 74 of transistor 69 whose collector 75 is grounded
through the lamp and whose base 76 in turn is connected to the
electrode 24. Thus it is clear that for the constant current to
flow through the patient's tooth, it must likewise flow through the
base 76 of transistor 69 which permits current to flow through the
lamp that is effectively across the battery when transistor 70 is
fully on. The lamp will only ignite when the desensitizer is
operating and it will only operate when the pads are electrically
connected through some circuit (patients mouth) so the necessity of
any on-off switch is eliminated.
Although the above-described circuit has been illustrated in
conjunction with the desensitizer, it can also be employed quite
independently to supply a selectable constant current. One such use
to which is has already been successfully applied is as a "pulp"
tester. The current, will, however, be slightly reduced where the
impedance exceeds 800,000 ohms and in either the case of the tester
or the desensitizer, the performance will not be seriously
degraded. On the other hand, higher currents 15 to 20 microamps
will cause the patient varying degrees of discomfort depending on
his sensitivity and the applied current. The present invention
limits the current and obviates these discomforts.
It should be understood, of course, that the foregoing disclosure
relates to only a preferred embodiment of the invention and that
numerous modifications or alterations may be made therein without
departing from the spirit and the scope of the invention as set
forth in the appended claims.
* * * * *