WO1998057597A1 - Dental syringe assemblies - Google Patents
Dental syringe assemblies Download PDFInfo
- Publication number
- WO1998057597A1 WO1998057597A1 PCT/GB1998/001754 GB9801754W WO9857597A1 WO 1998057597 A1 WO1998057597 A1 WO 1998057597A1 GB 9801754 W GB9801754 W GB 9801754W WO 9857597 A1 WO9857597 A1 WO 9857597A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tip
- assembly according
- water
- valve
- handpiece body
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
- A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
- A61C1/05—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive
- A61C1/057—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with turbine drive with means for preventing suction effect in turbine after deactivation of the drive air
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/02—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication
- A61C17/0202—Hand-pieces
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
- A61C17/02—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication
- A61C17/0217—Rinsing or air-blowing devices, e.g. using fluid jets or comprising liquid medication having means for manually controlling the supply of two or more fluids, e.g. water and air
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
- A61C1/0061—Air and water supply systems; Valves specially adapted therefor
- A61C1/0076—Sterilising operating fluids or fluid supply elements such as supply lines, filters
Definitions
- the non-return valve may be of any suitable form.
- the non-return valve may be of any suitable form.
- This adaptor 1 3 comprises a cylindrical adaptor body 14
- the adaptor body 14 has a further passageway 26 extending
Landscapes
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
A dental syringe assembly has a handpiece body (1) which is connected to an air and water supply hose (4). A disposable tip (2) is detachably connected to the handpiece body for directing air and water into a patient's mouth. A non-return valve is provided between the tip (2) and the handpiece body (1) to prevent return of contaminated material into the handpiece body (1). The tip (2) may be connected to the handpiece body (1) via an adaptor (13) in which case the valve is incorporated in the adaptor (13). Alternatively the tip (2) can be connected directly to a dedicated handpiece body (1) in which case the valve is incorporated in the body (1).
Description
DENTAL SYRINGE ASSEMBLIES
TECHNICAL FIELD
This invention relates to dental syringe assemblies such as are used
by dentists to direct air and/or water into a patients mouth for cleansing and
drying purposes.
BACKGROUND ART
An assembly of this kind is described in prior patent specification
WO 90/07912. The assembly described has a disposable plastics syringe
tip which is connected via an adaptor to a handpiece body to which air and
water are supplied. The tip can be discarded after use to avoid spread of
infection between patients. The adaptor is selected for the particular
handpiece body to permit use of a tip having a standardised connection. It
is also possible to connect a disposable plastics syringe tip directly (i.e.
without an adaptor) to a dedicated handpiece body.
Whilst this known arrangement provides an effective means of
preventing transfer of infection via material retained within the tip, there is
the possibility of infected material from one patient gaining access beyond
the tip to the handpiece body or adaptor from where it can be passed on to
the next patient through a fresh tip.
An object of the present invention is to provide means to
avoid such transfer of infection due to access of infected material beyond
the tip.
DISCLOSURE OF THE INVENTION
According to the invention therefore there is provided a dental syringe
assembly comprising a handpiece body adapted to be connected to sources
of air and water, and a tip arranged to be connected to the handpiece body
for directing flow of air and water from the handpiece body into the patients
mouth, characterised by the provision of a non-return valve arranged to be
connected between the tip and the handpiece body.
With this arrangement, the valve can help prevent draw back along
the tip from the open end thereof of contaminated fluids and can also block
access of infected material beyond the tip into the handpiece body and
thereby help prevent transmission of infection between patients.
In the case where the syringe assembly is arranged for separate
delivery of air and water, the non-return valve is preferably applied to the
water delivery, although alternatively or additionally, the valve may be
applied to the air delivery.
In a particularly preferred embodiment, the tip has separate air and
water passages which may be arranged coaxially or alongside each other
and these are connected separately to air and water inlets at the handpiece
body, and in this case the non return valve is preferably applied to the water
passage only.
The non-return valve may be of any suitable form. In a preferred
embodiment, the valve has a spring loaded valve member, such as a ball,
which is urged into sealing engagement with a valve seat, fluid pressure
during normal operation being sufficient to move the member off the seat
to permit passage of fluid.
Other kinds of non-return valve can also be used. For example, in an
alternative embodiment, the valve is of the constriction kind whereby valve
parts, such as silicon rubber reeds, tend to collapse or are urged into sealing
contact with each other but move apart in normal operation to permit
passage of fluid.
In the case where the valve is applied to water delivery which is
separated from air delivery, the valve may incorporate an outlet flow nozzle
to direct flow into the water passage of the tip and help prevent
communication, and hence transfer of material, between the air and water
passages.
This nozzle may be such as to extend into the water passage of the
tip and help form a seal therewith. The nozzle may be tapered to form a
tight wedging fit within the tip passage and this may contribute to or
establish the seal. Alternatively or additionally there may be an O-ring seal
or other sealing arrangement to fit around the tip passage, for example an
O-ring seal concentrically around the said nozzle whereby a tubular part of
the tip defining an inlet to the water passage fits tightly between the nozzle
and the O-ring seal.
In one embodiment, the valve may form part of an adaptor used
between the handpiece body and the tip such adaptor having one end
arranged to be screwed or otherwise tightly and securely mated with the
particular handpiece, and an opposite end having means for detachable
engagement with the tip.
As described in the above mentioned prior patent specification, the
tip may be disposable and the means on the adaptor for detachable
engagement with the tip may be adapted for use with a standardised tip.
The means on the adaptor for detachable engagement with the tip
may comprise a bayonet connection, although other connections may also
be used.
In an alternative embodiment, and especially in the case where the
tip is detachably connected directly to a dedicated handpiece, the valve may
form part of or be incorporated in the handpiece.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further by way of example only
and with reference to the accompanying drawings in which:-
Figs. 1 & 2 are diagrammatic sectional views of alternative forms of
syringe assemblies according to the invention; and
Fig. 3 is a detail of a modified version of the arrangement of Fig. 2.
BEST MODE OF CARRYING OUT THE INVENTION
Referring to Fig. 1 this shows a three way dental syringe assembly
having a handpiece body 1 , and a tip 2.
The body 1 comprises a tubular structure connected at one end 3 to
a flexible coaxial hose arrangement 4 with inner and outer conduits
respectively connected to pressurised sources of water and air (not shown) .
These conduits are in communication with respective passageways running
through the tubular structure to air and water outlets at the opposite end 4.
This opposite end 4 is of the form of an internally threaded cap.
Two levers or buttons 5, 6 are mounted on the body and operate
flow control mechanisms. When one lever or button 5 is pressed this
allows flow of water through the respective passageway in the tubular
structure 1 . When the other lever or button 6 is pressed this allows flow
of air through the other passageway in the tubular structure 1 .
The tip 2 is a moulded disposable plastic structure having inner and
outer coaxially arranged tubes 7, 8. At one end 9 the tip 2 has an angled
section.
At the other end 10 the tip has an enlarged outer sleeve 1 1 in
communication with the outer tube 8. The inner tube 7 extends within this
sleeve 1 1 . The sleeve 1 1 has opposite side bayonet slots 12.
The tip 2 is connected detachably to the body 1 by means of an
adaptor 13. This adaptor 1 3 comprises a cylindrical adaptor body 14
secured within an outer cylindrical sleeve 1 5. The adaptor body 14 has a
central through passageway 16.
One end portion 17 of the passageway 1 6 is enlarged and contains
a valve ball 18 which is urged by a coil spring 19 into sealing engagement
with a valve seat 20 at the junction between the enlarged end portion 17
and the adjacent small diameter portion 21 of the passageway 16.
The coil spring 19 is held captive within the enlarged end portion 1 7
of the passageway 1 6 by means of an inserted tube 22 having a central
tapered nozzle 23 directed away from the ball 18. Concentrically around
the nozzle 23 at the free end of the enlarged end portion 17 of the
passageway 1 6 there is mounted an O-ring seal 24. A further, smaller O-
ring seal 25 is set into opposite free end 21 of the passageway 16.
The adaptor body 14 has a further passageway 26 extending
therethrough alongside the central passageway 16. This further
passageway 26 opens at one end 27 adjacent the narrower end of the
central passageway 16. At its opposite end 28, this passageway 26 opens
to one side of the adaptor body 14.
The end part of the adaptor body containing the enlarged end
portion 17 of the passageway 16 is within the confines of the sleeve 15.
The opposite end part projects beyond the sleeve 1 5 and has an outer
peripheral screw thread 29. The adaptor body 14 has an outer flange 30
which retainingly abuts an inner flange 31 at one end of the sleeve 15. At
the opposite end of the sleeve 1 5 there are opposed inwardly directed
bayonet pins 32.
An annular space is defined between the sleeve 1 5 and the end part
of the adaptor body 14 containing the enlarged end portion 1 7 of the
central passageway 16. This annular space is bounded at its inner end by
an O-ring seal 33 mounted on the flange 30. The side-opening end 28 of
the side passageway 26 opens into the annular space.
The projecting end of the adaptor body 14 having the outer
screw thread 29 is screwed tightly into the internally threaded cap end 4 of
the handpiece body 1 . The central water passageway outlet engages the
O-ring seal 25 to form a water tight sealed connection with the central
passageway 16 in the adaptor body 14. The outer coaxial air passageway
connects with the side passageway 26 in the adaptor body 14.
The enlarged end 10 of the tip 2 is inserted within the annular space
and is held in position by engagement of the bayonet slots 12 with the
bayonet pins 32. The free edges of the outer sleeve 1 1 bear against the
outer O-ring seal 33, and the inner tube 7 fits tightly on the tapered nozzle
23 and is engaged on its outer periphery by the O-ring seal 24.
The inner tube 7 is thereby connected with the central passageway
1 6 and the outer tube 8 is connected with the side passageway 26 in a
secure manner and with water-tight sealing between the air and water
passageways.
When the lever or button 6 is actuated to admit pressurised air this
flows through the side passageway 26 in the adaptor body 14 into the outer
tube 8 of the tip 2 to exit from the free end thereof. In this position the
ball 18 is pressed tightly against the valve seat 20 ensuring that the inner
tube 7 in the tip is sealed relative to the water passageway 1 6 in the
handpiece body 14.
When the lever or button 5 is actuated to admit pressurised water
this flows through the central passageway 1 6 in the adaptor body 14 and
displaces the ball 18 off its valve seat 20 to permit flow into the inner
tube 7 of the tip to exit from the free end thereof. When this lever or
button 5 is released to cut off flow of pressurised water the valve ball 18
is immediately spring urged onto its valve seat 20 to seal the tip 2 relative
to the handpiece body 1 and thereby prevent reverse flow of any infected
matter.
After use, the tip 2 can be removed from the adaptor 13, by
disengaging the bayonet fixing, and discarded. Subsequently a fresh tip can
be used with the adaptor.
The adaptor 13 is selected to fit the particular handpiece body 1 at
the screwed end. At its opposite end it is adapted for use with a
standardised disposable tip 2. Different adapters can be provided for use
with different handpiece bodies 1 , such adaptors differing with regard to the
size or dimensions or mode of attachment of the projecting end of the valve
body but having the same size, dimensions and structure at the other end.
Fig. 2 shows an alternative embodiment which differs essentially only
with regard to the valve member. Other parts are constructed in like
manner to Fig.1 and the same reference numerals are used for these.
In place of the ball 18, the spring 19 and the nozzle 23, there is a
reed structure 34 held in place by a cylindrical structure 35. The reed
structure 34 has two silicone rubber strips or flaps shaped to lie against
each other at the end facing the tip 2 to define a closed tapering passage.
When water pressure is applied to the central passageway 16 the
strips or flaps move apart to permit passage of water. When the pressure
is turned off, the flaps collapse against each other and prevent backwards
flow from the tip 2.
As shown in Fig. 2, there is no nozzle for sealing engagement with
the inner tube 7 of the tip 2.
With the modification of Fig. 3, a nozzle 36 for this purpose is
shown, such nozzle being integral with the tube 35.
It is of course to be understood that the invention is not intended to
be restricted to the details of the above embodiment which are described
by way of example only. Thus, for example, although the foregoing
description is directed to an arrangement in which the tip 2 is connected to
the handpiece body 1 via an adaptor 13 it is to be understood that the tip
may be directly connected to a dedicated handpiece in which case the
releasable connection for the tip 2 and the one-way valve arrangement will
form part of or be incorporated in or attached to the handpiece body 1 , for
example essentially by integrating the structure shown in the drawings with
the handpiece body 1 rather than having the detachable connection
established with the screwthread 29.
Claims
1 . A dental syringe assembly comprising a handpiece body adapted to
be connected to sources of air and water, and a tip arranged to be
connected to the handpiece body for directing flow of air and water from
the handpiece body into the patients mouth, characterised by the provision
of a non-return valve arranged to be connected between the tip and the
handpiece body.
2. An assembly according to claim 1 arranged for separate delivery of
air and water characterised in that the non-return valve is applied to the
water delivery.
3. An assembly according to claim 1 wherein the tip has separate air
and water passages which are connected separately to air and water inlets
at the handpiece body characterised in that the non-return valve is applied
to the water passage only.
4. An assembly according to claim 3 characterised in that the air and
water passages are arranged coaxially in the tip.
5. An assembly according to any one of claims 1 to 4 characterised in
that the valve has a spring loaded valve member urged into sealing
engagement with a valve seat.
6. An assembly according to claim 2 or 3 or any claim dependent
thereon characterised in that the valve incorporates an outlet flow nozzle to
direct flow into the water passage of the tip.
7. An assembly according to claim 6 characterised in that the nozzle is
tapered to form a tight wedging fit within the tip passage.
8. An assembly according to claim 6 or 7 characterised in that a sealing
arrangement is provided around the tip passage to form a seal with the
nozzle.
9. An assembly according to claim 8 characterised in that the sealing
arrangement comprises an O-ring seal.
10. An assembly according to claim 9 characterised in that a tubular part
of the tip defining an inlet to the water passage fits tightly between the
nozzle and the O-ring seal.
1 1 . An assembly according to any one of claims 1 to 10 characterised in
that the valve forms part of an adaptor used between the handpiece body
and the tip.
12. An assembly according to claim 1 1 characterised in that the adaptor
has one end arranged to be mated with the handpiece and an opposite end
having means for detachable engagement with the tip.
13. An assembly according to claim 12 characterised in that the means
on the adaptor for detachable engagement with the tip comprise a bayonet
connection.
14. An assembly according to any one of claims 1 to 10 characterised in
that the valve forms part of the handpiece body.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9712462.2A GB9712462D0 (en) | 1997-06-17 | 1997-06-17 | Dental syringe assemblies |
GB9712462.2 | 1997-06-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998057597A1 true WO1998057597A1 (en) | 1998-12-23 |
Family
ID=10814203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/001754 WO1998057597A1 (en) | 1997-06-17 | 1998-06-16 | Dental syringe assemblies |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB9712462D0 (en) |
WO (1) | WO1998057597A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000033762A1 (en) * | 1998-12-04 | 2000-06-15 | Bukowski Joseph S | Dental handpiece syringe adaptor and tip |
WO2000035370A1 (en) * | 1998-12-17 | 2000-06-22 | Segal Alan J | Handpiece for a dental syringe assembly |
GB2465916A (en) * | 2009-08-12 | 2010-06-09 | Min Choon Wong | Dental syringe tip |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990007912A1 (en) | 1989-01-16 | 1990-07-26 | Segal Alan J | Dental apparatus |
US4998880A (en) * | 1987-11-09 | 1991-03-12 | Robert Nerli | Dental syringe safety sheath apparatus |
EP0642768A1 (en) * | 1993-08-09 | 1995-03-15 | Venootschap onder firma Havenco | A device for body care, in particular for dentistry or pedicure |
WO1995020934A1 (en) * | 1994-02-02 | 1995-08-10 | Regents Of The University Of Minnesota | Dental water and air purification equipment |
WO1997016152A1 (en) * | 1995-11-01 | 1997-05-09 | Scitech Dental, Inc. | Dental instrument filter and valve assembly |
-
1997
- 1997-06-17 GB GBGB9712462.2A patent/GB9712462D0/en active Pending
-
1998
- 1998-06-16 WO PCT/GB1998/001754 patent/WO1998057597A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4998880A (en) * | 1987-11-09 | 1991-03-12 | Robert Nerli | Dental syringe safety sheath apparatus |
WO1990007912A1 (en) | 1989-01-16 | 1990-07-26 | Segal Alan J | Dental apparatus |
EP0642768A1 (en) * | 1993-08-09 | 1995-03-15 | Venootschap onder firma Havenco | A device for body care, in particular for dentistry or pedicure |
WO1995020934A1 (en) * | 1994-02-02 | 1995-08-10 | Regents Of The University Of Minnesota | Dental water and air purification equipment |
WO1997016152A1 (en) * | 1995-11-01 | 1997-05-09 | Scitech Dental, Inc. | Dental instrument filter and valve assembly |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000033762A1 (en) * | 1998-12-04 | 2000-06-15 | Bukowski Joseph S | Dental handpiece syringe adaptor and tip |
WO2000035370A1 (en) * | 1998-12-17 | 2000-06-22 | Segal Alan J | Handpiece for a dental syringe assembly |
GB2359258A (en) * | 1998-12-17 | 2001-08-22 | Segal Alan J | Handpiece for a dental syringe assembly |
US6500000B1 (en) | 1998-12-17 | 2002-12-31 | Alan Julian Segal | Handpiece for a dental syringe assembly |
GB2359258B (en) * | 1998-12-17 | 2003-11-19 | Segal Alan J | Handpiece for a dental syringe assembly |
GB2465916A (en) * | 2009-08-12 | 2010-06-09 | Min Choon Wong | Dental syringe tip |
GB2465916B (en) * | 2009-08-12 | 2010-11-03 | Min Choon Wong | Dental syringe tip |
Also Published As
Publication number | Publication date |
---|---|
GB9712462D0 (en) | 1997-08-20 |
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