U.S. patent number 3,727,310 [Application Number 05/136,143] was granted by the patent office on 1973-04-17 for four-way dental syringe.
Invention is credited to Gary Baker.
United States Patent |
3,727,310 |
Baker |
April 17, 1973 |
FOUR-WAY DENTAL SYRINGE
Abstract
A dental syringe arranged for convenient selective discharge of
water, air or water-air mixture from a nozzle thereof as well as
for convenient selective drawing of vacuum from a vacuum passage of
the nozzle to thereby provide a four-way action. The syringe is
characterized by a convenient pistol-grip construction which
facilitates expiditious thumb manipulation of valves controlling
the flows of water, air and vacuum through the nozzle during use of
the syringe in normal dental procedures. The nozzle is removable
for autoclaving or other sterilizing techniques and the water
discharge opening is centered in an annular air discharge opening,
the vacuum opening being separate therefrom and positioned below
the air-water arrangement.
Inventors: |
Baker; Gary (Castro Valley,
CA) |
Family
ID: |
22471498 |
Appl.
No.: |
05/136,143 |
Filed: |
April 21, 1971 |
Current U.S.
Class: |
433/80; 604/24;
604/248; 604/275 |
Current CPC
Class: |
A61C
17/0208 (20130101) |
Current International
Class: |
A61C
17/00 (20060101); A61C 17/02 (20060101); A61c
019/02 () |
Field of
Search: |
;128/276,224,173.1
;32/33,22 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Peshock; Robert
Claims
I claim:
1. A four-way dental syringe comprising a body including a barrel
member and a grip merging in angular relationship at a juncture, a
vacuum passage, a water passage, and an air passage, each of said
passages extending upwardly through said grip member and in
parallel relation through said barrel, a rotary valve extending
transaxially through sad vacuum passage adjacent said juncture, a
wing knob on the outer side of the barrel member fixed to said
valve and operative to move said valve to control the magnitude of
the suction in said vacuum passage, separate valves in the body at
said juncture for controlling the flow of fluid through said water
and air passages, transversely spaced push buttons on the outer
side of the body adjacent said grip member and rearward of said
knob for actuating said separate valves, and a nozzle releasably
attached to the free end of the barrel member and having passages
in the walls thereof communicating with the respective vacuum,
water, and air passages in the barrel.
2. A four-way dental syringe in accordance with claim 1, in which
the discharge end of the suction passage in the nozzle member
extends axially outwardly beyond the discharge ends of the water
and air passages therein.
3. A four-way dental syringe in accordance with claim 1, in which
means for detachably securing the nozzle member to the barrel
member comprises tubular projections forming a portion of the air,
water, and suction passages of one of the members and frictionally
engaging in the passages of the other members.
Description
BACKGROUND OF THE INVENTION
Dental syringes of various types having valves arranged to be
operated individually or simultaneously to deliver either water or
air streams, as desired, or simultaneously to form a spray mixture
thereof, are available at present. However, with existing syringes,
the valves have been relatively complex and not arranged for
particularly convenient manipulation during use in normal dental
procedures. In addition such syringes have not included provision
for the selective drawing of a vacuum in conjunction with the
delivery of water, air or water-air mixture, which feature would
manifestly increase the utility of the device. Furthermore, the
nozzles of existing syringes of the foregoing type have generally
not been removable for separate autoclaving or equivalent
sterilization techniques.
SUMMARY OF THE INVENTION
The present invention relates to dental syringes in general, and is
more particularly directed to a four-way dental syringe arranged to
selectively provide a vacuum, water, air or water-air mixture in a
conveniently manipulatable manner.
An object of the present invention is to provide a four-way dental
syringe having a convenient pistol-grip construction with valve
operating elements located at the juncture of the grip and barrel
portions of the syringe to afford ready thumb manipulatable control
over the discharge of water and air from a nozzle at the end of the
barrel and the pulling of vacuum through the nozzle.
It is another object of the invention to provide a dental syringe
of the class described wherein the nozzle is removable from the
barrel for ready sterilization.
A further object of the invention is the provision of a dental
syringe of the class described wherein the water discharge opening
of the nozzle is centered in an annular air discharge opening to
provide proper combinations of air and water and the vacuum opening
is separate and positioned below the air-water arrangement.
In the accomplishment of the foregoing and other objects and
advantages, a syringe in accordance with the present invention
generally comprises a body of piston-grip configuration including a
grip and angularly projecting barrel having air and water passages
and a vacuum passage extending therethrough, the end of the grip
being adapted for connection of the passages to air, water and
vacuum conduits, valves disposed in the air and water passages
adjacent the juncture between the grip and barrel with flow control
elements positioned atop the barrel adjacent its opposite sides, a
valve disposed in the vacuum passage adjacent the juncture between
the grip and barrel and having vacuum control elements positioned
at the sides of the barrel adjacent the upper end of the grip, and
a nozzle adapted for removable coaxial securance to the end of the
barrel, the nozzle having air, water and vacuum passages sealably
communicating with those of the barrel, the air and water passages
of the nozzle merging to define a water discharge opening centered
in an annular air discharge opening.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side elevational view with portions broken away of a
dental syringe in accordance with the present invention;
FIG. 2 is a plan view with portions broken away of the syringe of
FIG. 1;
FIG. 3 is a sectional view taken at line 3--3 of FIG. 1;
FIG. 4 is a sectional view taken at line 4--4 of FIG. 1; and
FIG. 4 is a sectional view taken at line 5--5 of FIG. 1.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Referring now to the drawing, FIGS. 1 and 2 in particular, there is
shown a dental syringe 11 having a body 12 of pistol-grip
configuration including a grip 13 and barrel 14 angularly
projecting therefrom, the respective portions merging at a juncture
16. The body is preferably of plastic material such as teflon,
nylon, etc. Extending through the body there is provided a vacuum
passage 17 defined by a grip passage portion 18 and barrel passage
portion 19 angularly merging within the juncture 16. The vacuum
passage extends through the grip 13 adjacent the forward wall
thereof and through the barrel 14 adjacent the lower wall thereof.
In addition, a water passage 21 is provided through the body
adjacent one side thereof, such passage being defined by a grip
passage portion 22 and barrel passage portion 23 angularly merging
within the juncture 16, the portion 22 being disposed rearwardly of
the portion 18 of vacuum passage 17 and the portion 23 being
disposed upwardly of vacuum passage portion 19. Similarly, an air
passage 24 is defined through the body adjacent the opposite side
thereof by a grip passage portion 26 rearwardly of vacuum passage
portion 18 and a barrel passage portion 27 upwardly of vacuum
passage portion 19, air passage portions 24 and 26 angularly
merging within juncture 16. The vacuum, water and air passage
portions 18, 22 and 26 within the grip 13 preferably terminate in a
cylindrical recess 28 formed in the end of the grip to receive a
plug connection (not shown) having vacuum, water and air conduits
adapted for sealed communication with the respective grip passage
portions.
At the forward end of the barrel 14 there is provided a removable
nozzle 29 of similar material as body 12 adapted for coaxial
securance to define an extension thereof. More particularly, the
nozzle 29 is formed with a vacuum passage portion 31 extending
therethrough adjacent the lower wall thereof. The rearward lower
end of the nozzle is provided with a cylindrical extension 32
circumscribing vacuum passage portion 31. The forward lower end of
the nozzle is provided with a cylindrical projection 33 extending
forwardly of a crecent shaped shoulder 34 and circumscribing vacuum
passage portion 31. The nozzle 29 is also provided with water and
air passage portions 36 and 37 disposed upwardly of vacuum passage
portion 31. The passage portions 36 and 37 extend into a crescent
shaped shoulder 38 at the rearward end of the nozzle defined
superjacent the extension 32, adjacent the opposite sides of the
nozzle. Thereafter, passage portions 36 and 37 converge forwardly
with the air passage portion 37 terminating in a discharge opening
centrally of shoulder 34. A tubular member 39 extends into the
discharge end of air passage portion 37 in coaxially inwardly
spaced relation thereto and interiorly communicates with the water
passage portion 36. In this manner, the tubular member 39 defines a
discharge opening for the water passage portion within an annular
air discharge opening defined between the tubular member and
discharge end of the air passage portion 37.
Removable securance of the nozzle 29 to the forward end of barrel
14 is facilitated by means of the nozzle extension 32 and a pair of
tubular pins 41 and 42 projecting forwardly from the front end of
the barrel with the bores thereof communicating with and forming
extensions of the water and air passage portions 23 and 27. More
particularly, the vacuum passage portion 19 terminates in a
cylindrical recess 43 at the forward end of barrel 14 for receiving
the nozzle extension 32 in retentive tight fitting relationship. In
addition, the rearward ends of nozzle passage portions 36 and 37
are formed with enlarged cylindrical recesses 44 and 46 in shoulder
38 for receiving pins 41 and 42 in tight fitting retentive
relationship. The nozzle is thereby removably sealably secured to
the barrel with the vacuum passage portion 19 in communication with
vacuum passage portion 31, water passage portion 23 in
communication with water passage portion 36, and air passage
portion 27 in communication with air passage portion 37. Retentive
securance of the nozzle may be enhanced by means of a ball spring
check 47 disposed in the barrel radially of recess 43 to bear
against nozzle extension 32 upon insertion thereof in the
recess.
In order to facilitate convenient control over the flow of water,
air and vacuum through the syringe 11, suitable valve means are
provided in the juncture 16 of body 12. More particularly, a pair
of conventional normally closed push button valves 48 and 49 are
mounted within the juncture 16 at, respectively, the intersection
of grip and barrel water passage portions 22 and 23, and the
intersection of grip and barrel air passage portions 26 and 27.
Valves 48 and 49 include operating push buttons 51 and 52 which
project upwardly from the top of barrel 14 adjacent the opposite
sides thereof in close proximity to the rear wall portion of grip
13. Upon depression of push button 51, valve 48 is opened to
establish the flow of water through water passage 21 for delivery
from the discharge opening of nozzle water passage portion 36.
Similarly, upon depression of push button 52, valve 49 is opened to
establish the flow of air through air passage 24 for delivery from
the discharge opening of nozzle air passage portion 37. Of course,
upon depression of both push buttons, water-air mixture is
delivered from the coaxial discharge arrangement at the end of the
nozzle.
The intersection between the grip and barrel vacuum passage
portions 18 and 19 is formed with a transverse cylindrical valve
seat 53 which rotatably receives a cylindrical valve member 54
formed with a sectorial notch 56. A pair of wing knobs 57 and 58
are disposed on the opposite sides of the barrel 14 adjacent the
upper end of the grip 13 to afford rotation of the valve member. In
this manner, the valve member may be rotated between a closed
position wherein the member blocks communication between passage
portions 18 and 19, and open positions of varying degrees wherein
communication is established through portions of notch 56.
Consequently, various degrees of vacuum may be established through
the vacuum passage portion 31 of nozzle 29.
It will be thus appreciated that with the dental syringe 11
provided in the manner hereinbefore described, the pistol-grip body
12 may be conveniently gripped in the hand and the water and air
valve push buttons 51 and 52 and vacuum valve wing knobs 57 and 58
readily manipulated by the thumb to selectively discharge water,
air and water-air mixture from the nozzle 29, and to pull varying
degrees of vacuum therethrough. By virtue of the coaxial water and
air discharge opening afforded by tubular member 39, proper
combinations of water and air are conveniently and properly
arranged for. Moreover, the removable nature of the nozzle 29
facilitates ready sterilization thereof by autoclaving, or the
like.
* * * * *