U.S. patent number 3,696,357 [Application Number 05/028,722] was granted by the patent office on 1972-10-03 for enuresis prevention training device.
Invention is credited to Bernard W. Kilgore.
United States Patent |
3,696,357 |
Kilgore |
October 3, 1972 |
ENURESIS PREVENTION TRAINING DEVICE
Abstract
Enuresis prevention training devices, of the type wherein urine
bridges an open electrical circuit and thereby actuates an audible
signal generator, are made more effective and less distracting to
others if the signal generated is of low volume and directed into
the ear of the trainee. The signal generator is desirably carried
on a headband.
Inventors: |
Kilgore; Bernard W. (Mora,
MN) |
Family
ID: |
21845058 |
Appl.
No.: |
05/028,722 |
Filed: |
April 15, 1970 |
Current U.S.
Class: |
340/573.5;
340/602; 128/886; 381/378; 381/74 |
Current CPC
Class: |
A61F
5/48 (20130101) |
Current International
Class: |
A61F
5/48 (20060101); G08b 021/00 () |
Field of
Search: |
;340/235,279,224,407
;128/138,138A ;179/156,1AA,1VE,107 ;325/118,361 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Caldwell; John W.
Assistant Examiner: Myer; Daniel
Claims
What I claim is:
1. In a body fluid detecting device of the type which includes an
open switch means having spaced terminals and adapted for wearing
by a person adjacent the source of said body fluid, said switch
means being closed when said body fluid bridges said terminals, and
an electrically driven audible signal generating means which is
normally inoperative but is actuated when said switch means is
closed,
the improvement which comprises a headband having mounted thereon
an audible signal generating means that will generate only a low
volume signal which is substantially inaudible at a distance of a
few feet, said headband being adapted to completely cover one ear
of the wearer, tubular signal guide means for directing
substantially all of said signal into the ear of said person, one
end of said signal guide means being connected to said signal
generating means and the other end of said signal guide means
terminating in the portion of said headband which is adapted to
cover the ear of said wearer, whereby said signal promptly attracts
the attention of said person without attracting the attention of
others, and means to support said signal guide means on the head of
said person whereby said signal guide means is retained outside the
person's ear.
2. The device of claim 1 wherein the switch means comprises a thin,
strong, flexible, insulative film bearing a printed circuit with
closely interdigitated terminals, said film being enclosed in a
porous moisture-absorbent sheet material.
3. The device of claim 1 wherein the portion of the headband
adapted to cover the wearer's ear is spaced outward from the inner
surface of the headband.
4. The device of claim 1 wherein the signal generating means is
connected to the switch means by a pair of flexible stranded
wires.
5. The device of claim 4 wherein the circuit containing said wires
contains at least one pair of separable connectors.
6. The device of claim 1 wherein the headband includes an elastic
material.
7. The device of claim 6 wherein the headband is made of light
weight polyurethane foam.
8. The device of claim 6 wherein the headband is discontinuous and
has two ends which can be overlapped to the desired extent and
separably connected, one of said ends being provided at the surface
which contacts the other end with a multiplicity of small
filamentary hooks, and said other end being provided at the surface
which contacts said one end with a napped material adapted to be
engaged by said hooks.
9. In a body fluid detecting device of the type which includes an
open switch means having spaced terminals and adapted for wearing
by a person adjacent the source of said body fluid, said switch
means being closed when said body fluid bridges said terminals, and
an electrically driven audible signal generating means which is
normally inoperative but is actuated when said switch means is
closed,
the improvement which comprises a headband having mounted thereon
an audible signal generating means that will generate only a low
volume signal which is substantially inaudible at a distance of a
few feet, said headband being adapted to completely cover one ear
of the wearer, and signal guide means for directing substantially
all of said signal into the ear of said person, said signal guide
means extending from said signal generating means to the portion of
said headband adapted to cover the ear of said wearer, whereby said
signal promptly attracts the attention of said person without
attracting the attention of others, and means to support said
signal guide means on the head of said person in the immediate
vicinity of his ear.
Description
BACKGROUND OF THE INVENTION
This invention relates to body fluid detecting devices, especially
for the prevention and correction of enuresis.
Enuresis, particularly bed wetting among children, is an annoying
and embarrassing condition for the individual concerned, as well as
for his family. This condition is often the course of a wide
variety of anxieties, neuroses and other psychological problems and
the subject of considerable research. In an attempt to cope with
enuresis, many systems have been developed, the most popular of
which incorporate an electrical circuit connected to a power supply
and a signal such as a bell or buzzer. The circuit contains a
switch that is normally open, but urine, which contains dissolved
salts, shorts across the switch terminals, closing the circuit and
thus actuating the signal. U.S. Pat. No. 2,127,538 and 2,644,050
show devices of this type, incorporating an absorbent pad which
contains spaced electrodes, is placed on the bed. Another version
of this device in common use today includes a pair of superposed
foraminous aluminum foil sheets which are separated by a
moisture-absorbent insulative material and placed under the
enuretic individual; alligator clips attach to the metal sheets and
are connected to wires in an external electrically powered alarm
circuit. Although the alarm attracts the attention of the sleeping
enuretic, it also disturbs or awakens others who may be nearby.
Unless the pad is rather large, the enuretic may not always remain
in contact with it as he sleeps, thereby essentially destroying the
device's effectiveness. Large pads tend to be expensive and
(particularly in the case of the aforementioned aluminum sheets)
cold, nonconformable, uncomfortable, crackling, excessively fragile
and erratic in operation. Depending on the enuretic's sleeping
position, a considerable amount of urine may escape before the
device is actuated.
Another device which embodies the general system discussed in the
preceding paragraph, is shown in U. S. Pat. No. 2,874,695. Here the
spaced electrodes are mounted in an absorbent pad incorporated in a
pair of shorts worn by the enuretic, closing of the circuit
actuating a vibrator which is mounted on the wearer's belt.
Unfortunately, this arrangement does not readily attract the
attention of the wearer unless the vibrator produces a rather loud
noise, which again tends to annoy those who are nearby.
All known prior art devices draw a considerable amount of current,
a fact which sometimes leads to electrolytic skin burns and
ulceration. Such researchers as Borrie and Fenton, reporting in the
July 30, 1966 issue of British Medical Journal, have shown that a
current of as little as 3 milliamperes at 3 volts may cause
ulceration.
SUMMARY
The present invention provides a simple, safe, lightweight, sturdy,
convenient, self-contained, completely portable and highly
effective training device for enuretic individuals. Although this
device attracts the attention of the trainee almost
instantaneously, it does not disturb other persons who are in the
immediate vicinity.
In some ways, this invention resembles prior art devices in that it
includes an audible signal generator incorporated in an electrical
circuit containing an open switch which is bridged by escaping
urine. Significantly, however, the instant device directs an
extremely low volume signal directly to the ear of the trainee,
desirably by mounting the audible signal generator on a headband.
This device requires extremely low current drain and requires only
a few drops of urine to close the switch and produce an immediate
alarm response, regardless of the trainee's sleeping position. The
low current effectively prevents any electrolytic ulceration, while
the extremely brief time lag between emission of urine and
communication of the alarm to the trainee, constitutes a
classically effective learning situation.
BRIEF DESCRIPTION OF THE DRAWING
Understanding of the invention will be facilitated by referring to
the accompanying drawing, in which like numbers refer to like parts
in the several views, and in which:
FIG. 1 is a perspective view of a preferred embodiment of the
invention ;
FIG. 2 is a cross-sectional perspective view of the device shown in
FIG. 1, taken along section line 2--2 and looking in the direction
of the arrows; and
FIG. 3 is a schematic drawing indicating electrical circuitry
useful for the signal generating means of the invention.
DESCRIPTION OF PRESENTLY PREFERRED EMBODIMENT
Understanding of the invention will be further aided by examining a
specific embodiment of the foregoing device in somewhat greater
detail.
The device comprises headband assembly 10 and switch means 20,
electrically and mechanically connected by way of flexible stranded
wire pair 18, 18a. Headband assembly 10 comprises headband 11,
which is at least partially an elastic material. A suitable
material is an elastomeric polyurethane foam, which is both light
in weight and resistant to slippage on the head of the wearer; one
suitable foam is 1/4 inch thick and 1 inch wide. The foam may be
either closed cell or open cell, although the latter is porous and
may be lighter in weight and cooler. Headband 11 may comprise an
endless strip, but it is preferred to employ an unjoined strip
which is longer than necessary. The two ends of the strip can then
be overlapped to any desired extent; one end of the strip is
desirably provided with fastening material 12 which includes a
multiplicity of short stiff polymer hooks, while the other end is
provided with a fastenable material 12a which includes a
multiplicity of loops. (Cooperating hook and loop fastener material
of the 12, 12a type is commercially available under the tradename
"Velcro.")
Extending downward from headband 11 is depending tab 11a having a
shoulder 11b, with a radius, designed to fit snugly behind the ear
of the wearer. Ear cover 14 is positioned at approximately this
same place, extending farther forward than tab 11a and preferably
being separated therefrom by spacer strip 13. It will be noted that
this arrangement provides means for accommodating the ear of the
wearer and helping maintain headband 11 in fixed position, all
without discomfort.
Also mounted on headband 11 is signal generating means 15,
preferably positioned adjacent one end of spacer 13 and ear cover
14. Signal generating means 15, which is advantageously
incorporated in a small device of the type used in compact modern
hearing aids, is attached to headband 11 in any suitable manner,
e.g., by clipping, adhering, or otherwise fastening. Extending from
signal generating means 15 is signal guide means 16, which is
advantageously in the form of a No. 13 vinyl tube, the distal end
thereof extending inward from the outer surface of ear cover 14
through a hole therein so as to terminate just through, or nearly
through, the inner surface thereof. To insure that tube 16 is held
firmly in place, it is desirably surrounded by grommet 17, which
grips it snugly and may itself be adhered to ear cover 14.
Extending from signal generating means 15 to switch means 20 are
flexible stranded paired wires 18 and 18a. To facilitate assembly
and disassembly of the component parts of the device, each wire may
be made up of shorter wires which are separably joined by
connectors 19, 19a and 29, 29a. The wires may be pinned or clipped
to the pajama tops of a wearer, pass through appropriately located
loops therein, etc.
Switch means 20 comprises moisture-absorbent sheets 21 and 22,
which surround a strong but flexible insulative sheet material 23,
(e.g., 2- or 3-mil glass fiber-reinforced epoxy resin or biaxially
oriented polyethylene terephthalate film), advantageously forming a
disposable envelope open at one edge. Insulative sheet material 23
bears on one face an open, interdigitated printed circuit having
terminals 24 and 25 to which wires 18 and 18a are soldered. Switch
means 20 may be carried in a pocket mounted in the groin area of
pajamas or shorts, or it may be attached thereto with adhesive or
other suitable means, with the printed circuit facing the body of
the trainee. Even a few drops of urine contacting sheet 22 quickly
wick out to bridge the interdigitated spaced fingers connected to
terminals 24 and 25, closing the circuit and actuating signal
generating means 15.
The electrical circuitry in FIG. 3 shows a fairly conventional
miniaturized solid state oscillator which has been found suitable
for devices made with the invention. In this circuit, B represents
a dry cell, e.g., of the silver oxide type and typically having a
voltage of 1.5, R.sub.1 and R.sub.2 are fixed resistors, typically
having values of 1.5 megohms and 6.8 K-ohms respectively. R.sub.3
is a variable resistance, especially a 25 K-ohm rheostat. C is a
capacitor, preferably 0.0002 microfarad; T is a transducer, and
Q.sub.1 and Q.sub.2 are transistors. The resistance of switch means
20 exceeds 100 megohms in the normal dry condition, but promptly
drops to 200 ohms when the interdigitated spaced fingers of switch
means 20 are bridged by a small amount of urine. Idle current in
the circuit is approximately 0.7 microampere, and maximum current
through switch means 20 is only about 0.5 milliampere under
deadshort conditions. As the current through switch means 20
increases, the current in Q.sub.2 similarly increases; by positive
feedback through C, the circuit begins to oscillate, the amplitude
of oscillation being controlled by R.sub.3. The frequency of
oscillation of the circuit described is about 2,000-3,000 Hz, being
converted to sound by transducer T at a sound pressure level (SPL,
measured in units of 0.2 millidynes/cm.sup.2) on the order of
80.
It will be readily appreciated that those of normal skill in the
art can make various modifications of the specific embodiment
illustrated and described, without thereby departing from the
spirit of the invention. Thus the signal generating means 15 can be
associated with a receiver carried on headband 11 and electrically
connected to a transmitter associated with switch means 20, thereby
eliminating the necessity for wires 18, 18a. Similarly, variation
in constructional materials, shapes, etc., may be desirable in
specific circumstances.
In like manner, the sound provided by the signal generating means
may be continuous or intermittent, of constant or varying
frequency, level or changing volume, etc.
* * * * *