U.S. patent number 3,735,491 [Application Number 05/164,774] was granted by the patent office on 1973-05-29 for dental shielding device.
This patent grant is currently assigned to Sybron Corporation. Invention is credited to Javier A. Pabalan, Jr..
United States Patent |
3,735,491 |
Pabalan, Jr. |
May 29, 1973 |
DENTAL SHIELDING DEVICE
Abstract
A dental device positionable about the head of the patient for
protecting dental personnel during a dental procedure. The device
includes a cheek retractor, means for tensing the cheek retractor,
and reusable or disposable aspirator tubes carried by the cheek
retractor. The aspirating tubes each have an orifice directed into
the mouth of the patient with the other end of the tubes being
connected to a vacuum source. With this arrangement, odors,
aerosols and the like, such as finely divided tooth or filling
material which are generated in the mouth during a dental
procedure, are carried away by the aspirator tubes and are
prevented from being discharged into the air towards the doctor. In
another embodiment the tubes themselves function as cheek
retractors.
Inventors: |
Pabalan, Jr.; Javier A.
(Rochester, NY) |
Assignee: |
Sybron Corporation (Rochester,
NY)
|
Family
ID: |
22596032 |
Appl.
No.: |
05/164,774 |
Filed: |
July 21, 1971 |
Current U.S.
Class: |
433/93 |
Current CPC
Class: |
A61C
17/10 (20190501); A61B 1/24 (20130101) |
Current International
Class: |
A61B
1/24 (20060101); A61c 017/04 () |
Field of
Search: |
;128/271 ;32/33 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Peshock; Robert
Claims
Having thus described the invention in detail what is claimed as
new is:
1. A device for preventing egress of aerosols and the like from the
mouth of a dental patient comprising:
a. a cheek retractor; and
b. aspirator means on said cheek retractor having a single orifice
opening located in the patient's mouth between the planes defined
by the biting surfaces of the upper and lower teeth and directed
generally towards the geometric center of the oral cavity of the
patient.
2. A device as set forth in claim 1 wherein said aspirator means
comprises:
a. a tube member, said single orifice defining a first end of said
tube member;
b. said tube member being adapted to lie along the outside of the
patient's cheek and having a bent portion including said first end
for positioning said single orifice within the patient's mouth
between the biting surfaces of the upper and lower teeth when the
mouth is open and directing said single orifice generally towards
the geometric center of the oral cavity; and
c. means connecting the second end of said tube member to a vacuum
source.
3. A device as set forth in claim 2 wherein said tube member bent
portion comprises said cheek retractor.
4. A device as set forth in claim 2 wherein said cheek retractor is
bifurcate with said tube member being carried by said cheek
retractor between the prongs thereof.
5. A device as set forth in claim 2 comprising;
a. a pair of said tube members, one for each corner of the
patient's mouth; and
b. adjustable means connecting said tube members and passing around
the back of the patient's head.
6. A device for preventing egress of aerosols and the like from the
mouth of a dental patient comprising:
a. a pair of aspirator tubes each adapted to lie along the outside
of a patient's cheek;
b. each aspirator tube having a single orifice defining a first end
of said tube, a portion of said end being bent to position said
orifice in the patient's mouth between the planes formed by the
biting surfaces of the upper and lower teeth and directed generally
towards the geometric center of the oral cavity;
c. said aspirator tube bent portions forming cheek retractor means
adapted to hook each corner of the patient's mouth;
d. tensioning means for attaching said aspirator tubes to the
patient; and
e. means for attaching the second end of each aspirator tube to a
vacuum source for drawing aerosols and aerosol bore particles
created in the mouth of the patient during a dental procedure
directly into said orifice, whereby discharge of such aerosols from
the mouth of the patient is prevented.
7. A device as set forth in claim 6 wherein said last mentioned
means comprises:
a. a Y-fitting having a first branch in releasible communication
with the second end of one of said aspirator tubes, a common branch
communicating with said vacuum source, and a second branch, said
Y-fitting being adjacent one of said aspirator tubes; and
b. a flexible tube for connecting said second Y-fitting branch to
the other of said aspirator tubes, said flexible tube being adapted
to pass generally beneath the chin of the patient.
8. A device as set forth in claim 7 wherein:
a. said flexible tube comprises two sections joined with a
T-fitting; and
b. one of said aspirator tubes being connected to the third leg of
said T-fitting, said tube having its bent portion positionable over
the mandible of the patient and an orifice in said bent portion
opening generally towards the center of the oral cavity.
9. A device as set forth in claim 7 comprising:
a. a saliva ejector positionable over the mandible of the patient;
and
b. a flexible saliva ejector line connecting said saliva ejector to
said flexible tube, said line having a smaller diameter than said
tube.
10. A device as set forth in claim 9 comprising a slip-ring
slidably positioned over said tube, said ring frictionally engaging
said line to permit adjustment of the tension on said flexible
saliva ejector line.
Description
BACKGROUND OF THE INVENTION
The present invention relates generally to means for preventing the
discharge of finely divided air-borne tooth material, aerosols and
the like and the exudation of odors from the mouth of a patient
during a dental operation; and more specifically, to such a device
in combination with a cheek retractor.
It is well known in the art that dentists are especially
susceptible to respiratory illnesses and vulnerable to eye
infections and damage. This is partly because the head of the
dentist is very close to the mouth of the patient during the dental
operation so that the dentist's face is well exposed to any
pathogenic micro-organisms discharged from the mouth of the
patient. Also, when the dentist uses a high-speed drill to prepare
a tooth for filling, the drilling operation produces finely divided
tooth material such as enamel or dentin and other aerosols such as
oil droplets from the lubricating mechanism of the drill, water
sprays, and possibly mercury vapor in the case where an amalgam
filling is being removed. These materials are usually discharged
from the patient's mouth generally in a direct line with the
dentist's face. All these materials may be inhaled by the dentist
which also increase the likelihood of respiratory illnesses. These
materials may also impinge on the eyes causing eye infections and
the like.
To reduce the likelihood of inhaling such substances, some dentists
have taken to wearing surgical masks. However, the mask itself may
be uncomfortable and the sight of a surgeon's mask could unnerve a
sensitive patient. Besides, no practical face mask can effectively
filter aerosol particles 1/2 to 10 microns in diameter. These are
particularly dangerous as they are suitable vehicles for pathogens,
and can float around the operatory for many hours, endangering all
its occupants.
Apparatus has also been developed which creates an "air curtain"
between the dentist and his patient. In such apparatus, as shown
for example in U.S. Pat. No. 3,537,447, a stream of air is blown
across the mouth of the patient with sufficient velocity to prevent
the passage through the air stream of the aerosols and the like
expelled from the patient's mouth. Such devices, however, must be
placed in front of the patient's mouth and compromises the freedom
of movement of the dentist. These devices also remedy only part of
the problem in that the aersols, once expelled from the patient's
mouth could pass around the air stream. Also, as the dental
procedure may involve passage of the dentist's hands through the
air stream, its screening effect is seriously compromised.
The use of high velocity air suction with an evacuator tip held
adjacent the aerosol-generating instrument by an assistant, or by
using a suction tip placed in the patient's mouth has been shown by
study to reduce the bacterial aerosols escaping from the mouth. One
such study is reported in Journal of Dental Research, Vol. 48, No.
1, January-February 1969 on pages 49-56.
SUMMARY OF THE PRESENT INVENTION
The present invention utilizes an aspirator tube positioned at the
corner of the patient's mouth with one end of the tube being
directed into the mouth. Preferably, two aspirator tubes are used;
one positioned at each corner of the mouth with the tubes being
held in place by a cheek retractor which is adjustable about the
head of the patient. The aspirator tubes and cheek retractors
present a low profile and lie along side of the face of the patient
so as to interfere as little as possible with the dental procedure.
Alternatively, the aspirator tubes themselves when properly
configured, can act as cheek retractors. The aspirator tubes being
directed into the mouth produce a high vacuum field within the oral
cavity to provide direct aspiration of all odors, mists, and loose
and light particles in the oral cavity especially aerosols and
aerosol borne particles. Also, producing a vacuum field within the
oral cavity sets up a potent secondary effect consisting of a
healthy stream of outside air being drawn into the patient's mouth.
This stream of air entering the mouth effectively intercepts any of
the outgoing particles which may have temporarily escaped the
direct suction of the aspirator and forces these particles back
into the oral cavity for quick removal by the aspirator tubes.
Preferably the aspirator tubes are detachably attachable to the
cheek retractor to permit disposal after use.
In another embodiment of the invention, provision is made for
locating a second aspirator tube over the patient's mandible should
one of the tubes located at either corner of the mouth interfere
with the dental procedure. In still another embodiment, the tubes
themselves function as the cheek retractors and in still another,
provision is made for incorporating a saliva ejector with the
aspirator tubes and cheek retractors.
OBJECTS OF THE INVENTION
One object of the present invention is to provide an inexpensive
effective means for preventing the discharge of aerosols and the
like from the mouth of the patient during a dental procedure.
Another object of the present invention is to provide means for
retracting the cheeks of the patient and preventing discharge of
aerosols and the like from the patient's mouth.
A further object of the present invention is to provide in
combination with a cheek retractor, disposable means for creating a
high vacuum field within the oral cavity for direct aspiration of
aerosols and aerosol borne materials from the mouth of the patient
wherein the stream of outside air entering the patient's mouth to
fill the vacuum intercepts any outgoing particles which may have
initially escaped aspiration.
Still another object of the present invention is to provide means
for producing a high vacuum field within the oral cavity of the
patient which is attachable about the patient's head and lies along
side his face so as to not interfere with the dental procedure.
These and other objects, advantages and characterizing features of
the present invention will become more apparent upon consideration
of the following description thereof when taken in connection with
the accompanying drawings depicting the same.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view of the apparatus in place about the head of the
patient with one of the aspirator tubes being broken away;
FIG. 2 is a cross-sectional view of a section of the cheek
retractor and aspirator tube;
FIG. 3 is a view similar to FIG. 1 showing another embodiment of
the invention;
FIG. 4 shows still another embodiment of the invention;
FIG. 5 shows the dual purpose aspirator tip and retractors.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings, FIG. 1 shows the device of the present
invention generally indicated at 10 in place about the head of a
patient. The device includes a pair of cheek retractors 12 and 14,
one for each side of the patient's mouth. Each retractor member
includes a flat bifurcate body portion 16, terminating in inwardly
and rearwardly turned prongs 18 (FIG. 2). Body portion 16 is
adapted to lie flush against the outside of the patient's cheek and
the prongs hook the orbicularis oris at each corner of the
patient's mouth.
Retracting member 14 is attached to the base leg 20 of a generally
L-shaped, fitting 22. The other retracting member 12 is attached to
one branch 24 of a Y-fitting 26. Fittings 22 and 26 are connected
by an elastic strap 28 or other suitable tensioning means which
passes around the back of the patient's head. The amount of cheek
retraction may be adjusted by adjusting the tension of strap
28.
Fitting 22 is connected to another branch 32 of the Y-fitting by a
flexible tube 30 and the base leg or common branch 34 of the
Y-fitting is connected by a line 36 to a high volume evacuator, not
shown. Flexible tube 30 passes generally beneath the chin of the
patient and is sufficiently flexible so that the device may be used
for wide ranges of sizes and shapes of patient's faces.
Releasably inserted into both the base leg 20 of L-fitting 22 and
branch 24 of the Y-fitting are aspirator tubes 38. Tubes 38 lie
between the prongs of the bifurcate cheek retractors in order to
maintain the profile, as shown in FIG. 2, as low as possible. EAch
aspirator tube has a single orifice opening 40 defining one end of
the aspirator tube, and a bent portion 42 to position the orifice
within the patient's mouth. The angle of the bend ideally directs
the orifice 40 of the aspirator tube towards the geometric center
of the patient's mouth. However, the connection of the aspirator
tubes to fittings 22 and 26 is such that the tubes may be swiveled
up or down approximately = 45.degree. as desired to suit the
operating conditions.
As shown in FIG. 1, positioning the aspirator tubes at each corner
of the patient's mouth locates the bent portion 42 and orifice 40
of each tube between the planes defined by the biting surfaces of
the upper and lower teeth. With this arrangement, there is an
unobstructed path directly into orifice 40 and flow into the
orifice is not blocked or hindered by having the orifice disposed
against the gum line or tooth surface.
In operation, cheek retractors 12 and 14 are simply put in position
and the elastic band 28 connected around the back of the patient's
head. The high volume evacuator (not shown) is turned on so that
aspirator tubes 38 draw a vacuum in the oral cavity. With this
arrangement any free floating material such as tooth debris,
lubricating oil drops, pulverized amalgam, vaporized mercury, water
mist and the like which are created during the dental procedure as
well as all mouth odors are sucked through orifice 40 and into
aspirator tubes 38. In addition, the drawing of a partial vacuum
within the oral cavity causes an inrush of air into the patient's
mouth which acts effectively to intercept any outgoing particles
which may have temporarily escaped the direct suction of the
aspirator tubes and in this manner prevents the discharge of
aerosols and the like from the mouth of the patient.
In order to maximize the combined effects of direct aspiration and
the interception of outgoing particles by inrushing air, it has
been found that orifices 40 should be positioned about 1/2 inch
into the oral cavity. In this respect, direct aspiration may
diminish as orifice 40 is moved farther into the oral cavity away
from the work area and the suppression effect of the inrushing air
may diminish as the orifice is moved farther out of the oral
cavity.
In tests conducted on a mannequin, debris and aerosols created by
high speed drilling were simulated by blowing a mixture of air and
talcum powder into the oral cavity of the mannequin at various
input flows over a range of about 1.85 to 3.35 SCFM. The output
flow created by the high volume evacuator was adjusted in each case
until no talcum powder could be observed leaving the mouth of the
mannequin. It was found that with aspirator tubes having an
internal diameter of about 1/4 in., no talcum powder could be
observed leaving the mouth of the mannequin when utilizing output
flows of between 4 and 8 SCFM for input flows of 1.85 and 3.35 SCFM
respectively. While other diameter tubing may be used, the aerosol
suppressing effectiveness for a given vacuum sitting decreases as
the internal diameter of the tube decreases and tubes of larger
diameter tend to interfere with the dental procedure. Also, the
tubes may be made of any suitable material such as metal but
plastic is preferred both for patient comfort and for making the
tube disposable.
DESCRIPTION OF OTHER EMBODIMENTS
In describing other embodiments of the invention, the same
reference numberal with a letter prefix is used to denote like
structure.
In the event the location of an aspirator tube at either corner of
the patient's mouth would interfere with the operating procedure,
provision is made in the embodiment of FIG. 3 for the relocation of
one of the aspirator tubes. In this respect and with reference to
FIG. 3, flexible tube 30 (a) is bisected and the two sections
joined by two legs of a T-fitting 44. An aspirator tube 46 is then
detachably attached to the third leg 48 of the T-fitting. Aspirator
tube 46 has a bent end 50 positionable over the mandible of the
patient. An orifice 52 in end 50 is designed to create a vacuum
field directed towards the geometric center of the mouth. In this
embodiment either one or the other of aspirator tubes 38 (a) may be
removed from its respective fitting and the fitting closed off with
a removable plug 53 shown inserted into the L-fitting. The removed
aspirator tube is thus replaced by the central aspirator tube 46
without materially reducing the aerosol suppressing action of tubes
located at each side of the patient's mouth.
In the embodiment shown in FIG. 4, provision is made for
incorporating a saliva ejector into the design of the device. In
this respect, a slip-ring 54 is slidably positioned on flexible
tube 30 (b). The slip-ring is provided with a passage 56 which
fractionally embraces a flexible saliva ejector tube 58. One end 60
of the saliva ejector tube communicates with flexible tube 30 (b)
adjacent the Y-fitting and the other end 62 of the ejector tube is
attached to a standard saliva ejector 64. The slip-ring 54 permits
lateral adjustment of the saliva ejector tube along flexible tube
30 (b) while passage 56 permits vertical movement of the saliva
ejector to adjust the downward force of the ejector tip on the
lingual surface of the mandible. This latter motion is accomplished
simply by sliding the flexible saliva ejector tube within passage
56.
In the embodiment shown in FIG. 5, the aspirating tubes at each
corner of the patient's mouth also act as cheek retractors. As
shown in FIG. 5 each aspirator tube 68 has an end 70 bent inward
and rearward to form a hook which grasps the corner of the patients
mouth for retracting the cheeks. An orifice 72 is provided at the
bend 74 of each tube, the orifice opening generally towards the
geometric center of the patient's mouth. Any suitable soft member
76 may incase the extreme ends of the tubes or the tube ends may be
rounded to prevent injury to the interior of the patient's mouth
caused by tension exerted by elastic band 28 (c).
Having thus described the invention it should be appreciated that
the present invention accomplishes its intended objects, in
providing a sufficiently inexpensive apparatus for suppressing the
discharge of aerosol borne material from the mouth of the dental
patient. The use of cheek retractors either separately, or as part
of the aspirating tube provides a dual function of firmly anchoring
the device in place while retracting the cheeks of the patient to
afford the dentist an unobstructed field of view. One or more
components of the device such as the cheek retractors and/or the
aspirating tubes may be disposable items which would add to
efficiency in that the items could be discarded after use and would
not have to be sterilized for reuse.
* * * * *