U.S. patent number 3,590,820 [Application Number 04/797,139] was granted by the patent office on 1971-07-06 for aspirator tip.
Invention is credited to Raymond E. LaBrecque, Samuel A. Nehra, Oscar C. Saad.
United States Patent |
3,590,820 |
Nehra , et al. |
July 6, 1971 |
ASPIRATOR TIP
Abstract
A hollow cylindrical aspirator tip closed at one end and
including radially extending angularly spaced-apart primary
passages extending therethrough adjacent the closed end thereof and
relief passages in communication with the primary passages to
prevent drawing sufficient vacuum through the hollow cylindrical
tip in the primary passages to damage membranes in contact with the
tip over the outer ends of the passages. The relief passages are of
a smaller diameter than the primary passages to facilitate
maintaining a vacuum in the primary passages at all times.
Longitudinally extending slots are provided in communication with
each of the relief passages having a cross section less than that
of the relief passages to permit draining of fluid into the relief
passages while maintaining a vacuum therein.
Inventors: |
Nehra; Samuel A. (Grosse Pointe
Woods, MI), Saad; Oscar C. (Mount Clemens, MI),
LaBrecque; Raymond E. (Warren, MI) |
Family
ID: |
25170020 |
Appl.
No.: |
04/797,139 |
Filed: |
February 6, 1969 |
Current U.S.
Class: |
604/268 |
Current CPC
Class: |
A61M
1/84 (20210501) |
Current International
Class: |
A61M
1/00 (20060101); A61m 001/00 () |
Field of
Search: |
;32/33
;128/276--278 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Rosenbaum; Charles F.
Claims
What we claim as our invention is:
1. An aspirator tip comprising a hollow cylindrical member having
one closed end, radially extending primary passages through the
aspirator tip adjacent the closed end thereof, means operably
associated with the primary passages for relieving vacuum drawn in
the primary passages to prevent damage to mucous membrane or the
like in contact with the aspirator tip over the outer end of the
primary passages therethrough on drawing a vacuum through the tip
including longitudinally extending relief passages in the tip
communicating with the primary passages therein and further
including longitudinally extending slots between the exterior
surfaces of the tip and the relief passages in the tip to permit
drawing of fluid through the slots into the relief passages and
subsequently into the interior of the tip through the primary
passages.
2. Structure as set forth in claim 1, wherein the slots have a
smaller transverse cross section than the relief passages to
facilitate maintaining a vacuum in the relief passages.
3. An aspirator tip comprising an extruded hollow tubular member
and an end cap including a hemispherical portion and a
reduced-diameter cylindrical portion adapted to extend within an
end of the extruded tubular member to close one end thereof,
radially extending primary passages through the aspirator tip
adjacent the closed end thereof and means operably associated with
the primary passages for relieving vacuum drawn in the primary
passages to prevent damage to mucous membrane or the like in
contact with the aspirator tip over the outer end of the primary
passages therethrough on drawing a vacuum through the tip.
4. Structure as set forth in claim 3, wherein the end cap includes
the primary passages partly in the hemispherical portion thereof
and partly in the cylindrical portion thereof.
5. An aspirator tip comprising a tubular member having radially
extending primary passages therethrough, longitudinally extending
relief passages therein intersecting said primary passages,
longitudinally extending slots between the exterior surface of the
tip and the longitudinal relief passages in the tip to permit
drawing of fluid through the slots into the relief passages and
subsequently into the interior of the tip through the primary
passages.
6. Structure as set forth in claim 5 wherein the slots have a
smaller transverse cross section than the relief passages to
facilitate maintaining a vacuum in the relief passages.
7. Structure as set forth in claim 5 wherein the aspirator tip is
constructed of two separate pieces including an extruded tubular
member and an end cap including a hemispherical portion and a
reduced-diameter cylindrical portion adapted to extend within an
end of the extruded tubular member.
8. Structure as set forth in claim 7 wherein the end cap includes
the primary passages partly in the hemispherical portion thereof
and partly in the cylindrical portion thereof.
Description
The aspirator tip of the invention may have any overall cross
section desired and is illustrated with both a circular and
elliptical cross section. In one modification the aspirator tip is
an integral one-piece member, while in a second modification the
aspirator tip includes an elongated extruded cylindrical portion
and an end cap having the radially extending passages therein and
adapted to fit within the end of the hollow cylindrical member.
BACKGROUND OF THE INVENTION
1. FIELD OF THE INVENTION
The invention relates to aspirators and refers more specifically to
an aspirator tip having primary passages therethrough, through
which fluid is drawn into the aspirator tip and means in
communication with the primary passages for limiting the vacuum in
the primary passages to a level to prevent damage to membranes
which may be positioned over the ends of the primary passages with
the aspirator tip in use. The aspirator tip of the invention may be
used in any application where fluid is to be withdrawn from a
cavity having membranes or the like therein. Thus, the aspirator
tip of the invention is suitable for use in many medical
applications and in particular is useful in withdrawing saliva from
the mouth during dental work.
2. DESCRIPTION OF THE PRIOR ART
In the past, aspirator tips have been provided which have been
capable of causing damage to membranes positioned over openings in
the aspirator tips when normal operating vacuum was applied to the
tips. In particular many aspirator tips of the past have caused
discomfort to patients if not damage to membranes positioned over
the openings in the aspirator tips due to vacuum drawn through the
tips in dental work.
Wherein aspirator tips in the past have been provided with means
preventing patient discomfort and damage to membranes due to a
vacuum being drawn through the aspirator tips, the aspirator tips
have been particularly complicated and therefore uneconomical to
produce and often inefficient in use.
SUMMARY OF THE INVENTION
In accordance with the present invention an aspirator tip is
provided comprising a hollow cylindrical member closed at one end
having radially extending angularly spaced-apart primary passages
therethrough for drawing fluid into the aspirator tip on
application of a vacuum thereto which passages are relieved by
relief passages in communication therewith which limit the vacuum
drawn in the primary passages. The relief passages are further
relieved and fluid is allowed to flow into the relief passages
through slots in communication with the relief passages.
The aspirator tip of the invention may have any desired cross
section. In one embodiment of the invention the aspirator tip is an
integral one-piece member, while in a second embodiment the
aspirator tip is formed of an extruded tubular member having the
relief passages and slots therein and an end cap having the primary
passages therein adapted to fit over the end of the tubular
member.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevation view of an aspirator tip constructed in
accordance with the invention.
FIG. 2 is a transverse cross section of the aspirator tip
illustrated in FIG. 1 taken substantially on the line 2-2 in FIG.
1.
FIG. 3 is a perspective view of a longitudinally split aspirator
tip, as illustrated in FIGS. 1 and 2.
FIG. 4 is a section view of a modification of the aspirator tip
illustrated in FIGS. 1 through 3 showing an elliptical cross
section for the aspirator tip.
FIG. 5 is a partly broken away perspective view of a second
embodiment of the aspirator tip of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The aspirator tip 10 illustrated in FIGS. 1 through 3 is a hollow
cylindrical member having a closed end 12 and an open end 14. A
reduced-diameter portion 16 is provided adjacent the closed end 12
of the aspirator tip 10, forming an abutment 18.
Vacuum tube 20 is inserted in the aspirator tip 10 with one end of
the tube 20 abutting the abutment 18 with the aspirator tip in use.
The radial dimension of the wall of tube 20 and the abutment 18 are
substantially equal to provide a smooth interior surface between
the aspirator tip 10 and the tube 20, whereby flow of fluid through
the aspirator tip 10 is unobstructed. In addition, the abutment 18
limits the depth of insertion of the tube 20 into the tip 10. The
other end of the tube 20 may be connected to the usual source of
vacuum for aspirators which is not shown.
Radially extending angularly spaced-apart primary passages 22
through which fluid is drawn into the aspirator tip 10 for
subsequent passage through the tube 20 are provided adjacent the
closed end 12 of the aspirator tip 10, as shown best in FIGS. 1 and
3. In use, for example, in dental work wherein the aspirator tip 10
is positioned in the mouth of a patient to facilitate withdrawal of
saliva and the like, vacuum drawn in passages 22 has, in the past,
produced patient discomfort due to drawing of the membranes of the
mouth over the outer ends of the passages 22. In some instances
actual damage to the membranes has occurred due to excessive vacuum
in the passages 22.
Therefore, in accordance with the invention, there is provided
relief passages 24 extending longitudinally of the aspirator tip
from the primary passages 22 to the open end 14 of the aspirator
tip 10. The relief passages 24 are of a smaller diameter than the
primary passages 22 so that they limit the vacuum drawn in the
primary passages 22 by the usual vacuum source to prevent patient
discomfort or membrane damage while still permitting drawing of
sufficient vacuum in the primary passages 22 to withdraw fluid
through the aspirator tip. Since the relief passages 24 are
positioned at right angles to the primary passages 22 and extend
through the open end 14 of the aspirator tip 10 adjacent the tube
20, it is particularly unlikely that both the outer end of the
relief passages 24 and the outer end of the primary passages 22
will be blocked at the same time.
In addition, as shown in FIGS. 1 through 3, longitudinally
extending slots 26 are provided in conjunction with each of the
relief passages 24. The slots 26 extend radially of the aspirator
tip 10 between the outer surface of the aspirator tip and the
relief passages 24. Slots 26 further assure that both the primary
passage 22 and the relief passage 24 will not be blocked
simultaneously. In addition, fluid is allowed to drain into the
relief passages 24 through slots 26 and since the slots 26 have a
considerably smaller transverse cross section than the relief
passages 24, as illustrated in FIG. 2, it is possible to maintain a
vacuum in the relief passages 24 to facilitate drawing fluid
therethrough with the usual vacuum source.
While a circular cross section has been shown for the aspirator tip
10 in FIGS. 1 through 3, it will be understood that any desired
cross section may be used for the aspirator tip 10. For example, an
elliptical aspirator tip cross section is illustrated in FIG. 4,
wherein similar features have been given the same reference
numerals, as in FIGS. 1 through 3.
The aspirator tip 10 illustrated in FIGS. 1 through 4 is an
integral member which may be injection molded in one piece, as
shown. However, in some applications it may be desirable to produce
an aspirator tip 30, as shown in FIG. 5. The aspirator tip 30 is
constructed of two separate members, including the extruded tubular
member 32 and the end cap 34 which may be injection molded.
The extruded member 32 may again be positioned over a vacuum tube,
such as tube 20 or may in itself be connected to a vacuum source.
Extruded member 32 includes the relief passages 24 and the slots 26
therein.
The end cap 34 includes the hemispherical portion 36 and the
smaller diameter cylindrical portion 38 adapted to fit within the
end of the extruded member 32, as shown in FIG. 5. The primary
passages 22 of aspirator tip 34 are replaced by channels 40 in the
end cap 34 which communicate with the interior of the tubular
member 32 through longitudinally extending channels 42 in the
cylindrical portion 38 of the end cap 34, again as shown in FIG.
5.
The operation of the embodiment of the aspirator tip illustrated in
FIG. 5 is similar to that of the operation of the aspirator tip 10.
Thus, on application of a vacuum to the end of the tubular member
32, fluid will be drawn through the channels 40 and 42 into the
extruded member 32. Should a membrane be placed over the end of one
of the channels 40, the vacuum in the channel 40 will be relieved
through the longitudinally extending passages 44 to an extent to
prevent patient discomfort or membrane damage. Additional fluid may
be drawn into the aspirator tip 30 through the passages 44 which
are relieved by the smaller cross section slots 46.
Thus, there has been disclosed an aspirator tip which is
particularly simple in construction, economical to manufacture and
efficient in use. While two embodiments of the aspirator tip and a
modification thereof have been illustrated in detail, it will be
understood that other embodiments and modifications of the
invention are contemplated by the inventors.
* * * * *