U.S. patent number 3,831,598 [Application Number 05/292,942] was granted by the patent office on 1974-08-27 for sterile anesthetic instruments.
Invention is credited to Irvin D. Tice.
United States Patent |
3,831,598 |
Tice |
August 27, 1974 |
STERILE ANESTHETIC INSTRUMENTS
Abstract
A self contained cataphoric device which may be conveniently
hand held by or attached to the patient for locally anesthetizing
an area of tissue. The device includes a central body portion
containing a battery having one terminal connected to an
electrically conducting outer surface. Connected to one end of this
central body is a rigid arm having an electrical contact socket
connected to the remaining battery terminal and located at the
opposite end of the rigid arm for receiving an absorbent pledget
made of material such as compressed felt. The absorbent material is
saturated with a conventional anesthetizing agent. Typically, the
patient will hand hold the central body portion thus automatically
making electrical contact with one terminal of the battery through
the outer conducting surface. The saturated pledget will then be
applied to the area where anesthesia is desired thus completing an
electrical circuit through the body such that significant amounts
of the anesthetizing agent are physically transported by the
electrical current below the skin surface in the desired local area
to achieve anesthesia.
Inventors: |
Tice; Irvin D. (Salem, OH) |
Family
ID: |
23126917 |
Appl.
No.: |
05/292,942 |
Filed: |
September 28, 1972 |
Current U.S.
Class: |
604/20; 607/134;
607/151; 607/153 |
Current CPC
Class: |
A61M
31/00 (20130101); A61N 1/303 (20130101) |
Current International
Class: |
A61M
31/00 (20060101); A61N 1/30 (20060101); A61m
035/00 () |
Field of
Search: |
;128/172.1,399-409,303.1,24.1,417,172,269 ;401/199 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
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730,652 |
|
Aug 1932 |
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FR |
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376,028 |
|
Oct 1939 |
|
IT |
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966,559 |
|
Oct 1950 |
|
FR |
|
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Cohen; Lee S.
Attorney, Agent or Firm: Cushman, Darby & Cushman
Claims
What is claimed is:
1. A sterile anesthetic instrument for producing local anesthesia
through cataphoric transport of anesthetic agents, said instrument
comprising:
a bottom encapsulating portion;
a central body having first and second ends and hermetically sealed
at the first end to said bottom encapsulating portion, said central
body having a longitudinal axis and having a rectangular
cross-section perpendicular to said longitudinal axis,
said central body also comprising a self-contained battery and an
electrically conducting outer surface area electrically connected
to one terminal of said battery;
a rigid arm having a longitudinal axis and an electrically
insulated outer surface hermetically sealed at one end to said
second end of said central body portion and having the opposite end
of said rigid arm extending away from said central body portion
along the longitudinal axis of said rigid arm, wherein said battery
is hermetically sealed between said bottom encapsulating portion
and said extending arm;
an absorbent structure means for absorbing and storing a quantity
of said anesthetic agent;
an electrically conducting socket receiving said absorbent
structure and positively retaining said absorbent structure
therein, said socket being disposed on said opposite end of said
rigid arm and electrically connected to the remaining terminal of
said battery through said rigid arm;
said socket also being recessed within an insulating material to
prevent direct contact with a user's skin surface,
said socket having a central axis disposed at a right angle with
respect to the longitudinal axis of said rigid arm; and
the central axis of said socket being disposed at a predetermined
angular relationship with respect to the longer dimension of said
rectangular cross section of said central body.
2. A sterile anesthetic instrument as in claim 1 wherein said
electrically conducting socket includes retaining ridges therein
circumferentially disposed about said absorbent structure.
3. A sterile anesthetic instrument as in claim 2 wherein said
absorbent structure is anesthesia saturated and has a disc-sphere
shaped end projecting away from said socket.
Description
This invention relates generally to the art of cataphoresis wherein
electrical current through human or animal tissues is utilized for
transporting conventional anesthetic agents into the tissue
material. More specifically, the invention relates to a cataphoric
device for simply, quickly and effectively pre-anesthetizing a
tissue area prior to an injection. In the case of dentistry, the
injection which is given after such preanesthesia may itself be an
anesthetizing agent destined for more remotely located tissues.
However, because of the pre-anesthetic effect in the local surface
area achieved through cataphoresis with this invention, the actual
penetration of the needle into the more remote tissues will not be
felt by the patient or animal involved.
The basic concepts of cataphoresis are well known in the art. Such
prior art U.S. Pat. Nos. as 569,380 - Hollingsworth; 591,160 - Dow;
865,330 - Clymer et al; 868,123 - Randall; and 1,076,210 - Kerr et
al. each teach various prior art types of cataphoric apparatus. In
spite of several far reaching statements in such prior art patents,
it has been discovered that the physical transport of medicinal
materials such as anesthetizing agents does not actually result in
deep penetration within tissue material. Rather, actual tissue
penetration due to the cataphoric effect is rather shallow.
However, even shallow penetration of strong anesthetic agents
results in significant local anesthesia which is very useful in
many dental, medicinal and/or veterinary practices such as the
previously mentioned pre-anesthesia of a local area before actually
penetrating that area with an injection needle.
In spite of the rather early discovery of the basic cataphoric
phenomena, not much practical use has been made of it in recent
times due to the cumbersome and complicated designs of conventional
cataphoric devices. These devices relied on heavy costly batteries
and complex control circuit designs that often required a very
skilled operator. High levels of electrical currents were utilized
which, together with the complex control circuits often resulted in
electrical shocks, burns and/or frightening sensations of
electrical current by the patient involved. Many of these earlier
devices also relied upon unwieldy clamps, springs, forceps, and/or
other mechanical contrivances as a part of the electrode in contact
with patient's body. Besides conveying a disturbing psychological
impression to the patient, such an unwielding conglomeration of
springs, clamps, wires, etc. often actually interfered with medical
procedures. For instance, in dentistry such an unwieldy electrode
design prevents the patient from easily expectorating or expelling
excess saliva. Furthermore, such designs are inherently unsanitary
for use as a medical tool successively used by different
patients.
Now, however, the invention described herein has been discovered to
provide a unique and highly desirable structure for a cataphoric
device which overcomes the defects associated with such
conventional devices. This new cataphoric device will fill urgent
requirements in dentistry, medicine, and veterinary practice for
such procedures as pre-anesthesia of an area prior to an injection.
It is simply constructed using conventional transistor radio
batteries as a power source and with conventional anesthetizing
agents such as mepivocaine (Carbocaine) or other conventional
anesthetizing agents as will be apparent to those in the art.
The cataphoric device of this invention is extremely compact and
lightweight (the exemplary embodiment to be described below weighs
only approximately 5 ozs.) while being completely portable and hand
held for applications to the human body. Of course, in veterinary
medicine, the device must be strapped or otherwise attached to
animal tissues as will be explained in more detail below. Since
there are no external wires to the unit of any kind, the patient is
never really aware of the fact that electrical currents are being
employed with the device. Accordingly, there is no psychological
hesitation to utilize the device since there is also no unpleasant
sensation of any current flow nor risk of electrical shocks, burns,
etc. to the patient.
Besides eliminating any external electrical wires, there are
absolutely no required control adjustments of any kind in the
nature of switches, reostats, meters, dials or any other kind of
controls such that absolutely no special skill of any kind is
required for using this cataphoric device. Once the active end of
the device is properly positioned on the area for which local
anesthesia is desired, the patient may himself hold the device in
place with no further surveillance.
With respect to dental use for pre-anesthetizing an area later to
receive some form of injection by needle, the cataphoric device of
this invention provides extreme versatility in that virtually any
part of the mouth may be conveniently pre-anesthetized including
the upper hard palate as well as the hard to reach buccal folds and
tissues at the rear of the mouth. Sufficient local anesthesia is
achieved very quickly (within four to six minutes using the
exemplary embodiment) and the device may be easily applied and
removed by the patient during this period for such purposes as
expelling excess saliva, etc.
Of course, the same basic design will also serve for local
anesthesia of the eye, ear, nose, and/or other skin areas of the
patient as will become apparent to those in the art.
While many applications of the device will use liquid anesthetizing
agents, it has been discovered that equally good results may be
obtained when the anesthetizing agent is in the form of a gell or
salve. In fact, in some applications, it is virtually imperative
that the anesthetizing agent be in such a form. For instance, it
has been discovered that a gell form of anesthetizing agent may be
introduced into the urethra and then activated by the cataphoric
device of this invention to provide anesthesia of the urethra prior
to catheterization.
Of course, since the entire device of this invention is completely
self contained and encapsulated, its cleanliness may be assured by
rinsing or emersing the entire unit in a sterilizing solution after
each use. As will be explained in detail below, several types of
shapes or configurations may be utilized for the felt tips or
pledgets of this device depending upon the desired utilization of
the device.
A more complete understanding of the invention can be obtained by
reading the following detailed description in conjunction with the
accompanying drawings, of which:
FIG. 1 is a front view of an exemplary embodiment of the cataphoric
device of this invention;
FIG. 2 is a cross-section of a side view of the cataphoric device
shown in FIG. 1;
FIG. 3 is a pictorial view showing an exemplary use of the FIG. 1
device in the practice of dentistry; and
FIGS. 4, 5 and 6 are pictorial drawings of exemplary pledget
structures for use with the exemplary cataphoric device shown in
FIGS. 1 and 2.
Referring to FIG. 1, an exemplary embodiment of the cataphoric
device of this invention is shown in front view. There is a central
body portion 10 and an upper rigid arm portion 12 attached thereto.
In the exemplary embodiment, the central body portion 10 has a
rectangular cross-section conforming generally to the rectangular
crosssection of conventional transistor radio batteries. A portion
14 of the outer surface area of the central body 10 is formed of an
electrically conducting material such as, for instance, zinc,
copper, aluminum, etc.
The electrical battery 16 housed within the central body portion 10
has one terminal (the negative terminal for most anesthetizing
agents having positive radicals as will be appreciated) which is
electrically connected to the outer conducting area 14 as shown in
FIG. 2. As will be appreciated, it would be possible to even
utilize the outer container of some batteries as the surface 14
since such outer surfaces normally constitute the negative battery
terminal. The other terminal of battery 16 is connected through arm
12 to an electrically conducting contact or socket 18 having
retaining ridges disposed within the upper end of the arm 12. This
connection may be in the form of a wire 20 extending through the
center of the arm 12 or it may, in fact, be an integral part of the
arm 12 such as, for instance, if the arm were formed of a copper
tube coated with some insulating material. Preferably, the arm 12
as well as the encapsulating portion of the central body portion 10
is comprised of a unitary epoxy or plastic structure. The battery
16 is shown schematically in FIG. 2 with a bottom encapsulating
portion 22 of the central body 10 also comprising an epoxy of
plastic substance for hermetically sealing the battery 16 within
the central body 10. As will be appreciated, in actual practice the
battery 16 would be hermetically sealed within a unitary
encapsulation structure having the outer conducting surface 14 and
the upwardly extending arm 12.
A pledget 24 is inserted in the electrical contact socket 18 and
held in place by the retaining ridges. In use, the pledget 24
should be saturated with any desired conventional anesthetizing
agent as will be apparent to those in the art.
As shown in FIG. 3, a typical application in the field of dentistry
would involve a patient 26 holding onto the central body 10 of the
device and thus automatically making electrical contact with the
outer surface 14 thereof. The rigid arm 12 would then be inserted
within the mouth of the patient and the pledget (saturated with a
desired anesthetizing agent) would be held against the desired
portion of the mouth. Thus, an electrical circuit would be
completed through the patient's body to permit the cataphoric
effect to transport the anesthetizing agent below the surface of
the skin at the desired area within the patient's mouth, thus
locally anesthetizing this area and numbing it sufficiently to
prevent feeling a later inserted injection needle in that area.
Although each person's body will vary somewhat, it may be generally
said that the human body presents approximately 1,000 ohms of
electrical resistance as will be appreciated by those in the art.
Using the cataphoric device of this invention, it has been
discovered that approximately 9 to 12 volts (from conventional
batteries normally used in transistor radio circuits) is sufficient
electrical voltage for the battery 16. Of course, since the body's
resistance is approximately 1,000 ohms, this means that
approximately 9 to 12 milliamps of electrical current are involved
in the electrical circuit completed through the patient's body. As
will be appreciated by those in the art, this is not generally
sufficient current to cause the patient to feel a sensation of
electrical current passing through his body.
It has been discovered that using the standard 9 volt transistor
battery 16 will result in sufficient local anesthesia within four
to six minutes to permit a painless needle injection. By increasing
the voltage to 12 volts and hence the electrical current to 12
milliamps, this time period may be reduced by a factor of
approximately two to 2-3 minutes. However, at the upper voltage
(i.e., 12 volts) some patients may be able to sense the presence of
an electrical current.
The pledget 14 is preferably comprised of compressed felt; however,
any form of absorbent material having enough structural rigidity to
approximately maintain its shape under slight pressures such as
those that may be exerted by the hand-held application shown in
FIG. 3 would suffice as should now be apparent.
Different shapes of pledgets will be found to work with different
degrees of success or effectiveness depending on the type of
application involved. For instance, for the usual type of
pre-anesthetizing in dental applications, the pledget of
cylindrical shape shown in FIG. 4 and/or the pledget having the
disc-spherical shape shown in FIG. 5 have been found most
effective. The discsphere shape shown in FIG. 5 would be used for
the hard upper palate of the mouth while the cylindrical shape
shown in FIG. 4 would be used for other areas of the mouth.
The shape shown in FIG. 6 (frusto-conical) has been discovered as
being especially advantageous in anesthetizing the urethra prior to
catheterization. For instance, a gell formed of a conventional
anesthetizing agent is introduced into the urethra and then (with
the pledget shape shown in FIG. 6 inserted within the socket 18 of
this device), the small frusto-conical end of the pledget is
applied to the end of the urethral opening by the patient to cause
cataphoric transport of the anesthetic agent into and below the
surface of the urethra channel tissues thus permitting subsequently
painless catheterization of the patient.
It should be noted that in FIG. 2 that the electrical socket 18
terminates at point 28. That is, the socket 18 is recessed within
the insulating material 30 forming the outside of the rigid arm
assembly 12. This prevents the patient's skin from actually coming
into direct contact with the electrical conductor 18 and thus
prevents electrical burns which would otherwise result from such
direct contact. Of course, there is no danger of electrical burns
from the surface area 14 being in direct contact with the user's
skin since there is a much larger surface area of skin
involved.
The rectangular shape of the central body portion 10 which
corresponds roughly with the size and dimensions of the usual
conventional rectangular 9 to 12 volt transistor radio battery is
especially convenient for a hand-held instrument such as the
exemplary embodiment shown in FIGS. 1 and 2. Furthermore, the
angular position of the pledget 24 and the socket 18 for receiving
the pledget with respect to the arm 12 is especially advantageous
for reaching all areas of the mouth and/or other parts of the body.
That is, with the axis of the socket 18 situated at approximately
90.degree. with respect to the axis of the arm 12, it is very
convenient for the patient to hand-hold the device as shown in FIG.
3 and apply the active end of the pledget 24 to any desired area of
the inside mouth surfaces. Of course, other than 90.degree. angles
might be used if desired as will now be appreciated.
For applications in veterinary medicine, the device of this
invention is physically strapped or otherwise affixed to the body
or limbs of the animal patient by a piece of tape or elastic wrap,
etc. Of course, the same concept could be used for human bodies if
desired thus permitting the human or animal complete freedom of
movement while the pre-anesthesia effect is taking place. For this
application, the axis of the pledget 24 and socket 18 should
preferably be rotated by 90.degree. from the positioning shown in
FIGS. 1 and 2. That is, the axis of the pledget 24 should
preferably be perpendicular to the larger surface of the
rectangular body 10. Thus, when the rectangular body 10 is
elastically or otherwise strapped to the limb or body of the
patient or animal, the pledget 24 would be more stable and thus
more likely to be maintained in contact with the desired surface
area as should now be apparent.
Furthermore, while the rectangular cross-section is shown in FIGS.
1 and 2 is preferable for such reasons as the procedures described
in the just preceding paragraph, different shapes could also be
utilized for certain applications as should now be appreciated. For
instance, in the hand-held application for the field of dentistry,
as shown, for example, in FIG. 3, a round battery structure and/or
round body 10 might be utilized instead of the rectangular shape as
should now be appreciated. Of course, other shapes might also be
used if desired.
It should now be appreciated that the cataphoric device just
described provides an extremely lightweight self-contained device
without any external electrical wires, switches, meters, reostats,
controls, dials, etc. It provides for a unique inclusion of the
user's body in the electrical circuit required for the cataphoric
effect while yet offering complete freedom of movement on the
user's part and complete freedom from surveillance during use.
Absolutely no skill is required on the operator's part and it
provides for quick application and removal of the device which is
of great importance in dental use, for instance, where the patient
must frequently expectorate. The recessed electrical socket 18
makes the device completely safe from electrically burning the
patient while the angle relationship between the axis of the
pledget and the rigid slender arm of the device facilitates easy
application to any desired area of the human or animal body. The
pre-formed felt tips of various shapes may, of course, be
pre-packaged and saturated with a desired anesthetizing agent and
the entire device is completly hermetically sealed and immersible
to provide a sanitary one-piece design.
While only a few exemplary embodiments of this invention have been
described in detail above, those in the art will readily appreciate
that many obvious modifications may be made in the exemplary
embodiments without in any way departing from the spirit or
teachings of this invention. Accordingly, all such modifications
are intended to be included within the scope of this invention.
* * * * *