WO2011151779A2 - Saliva ejector and method for making the same - Google Patents
Saliva ejector and method for making the same Download PDFInfo
- Publication number
- WO2011151779A2 WO2011151779A2 PCT/IB2011/052372 IB2011052372W WO2011151779A2 WO 2011151779 A2 WO2011151779 A2 WO 2011151779A2 IB 2011052372 W IB2011052372 W IB 2011052372W WO 2011151779 A2 WO2011151779 A2 WO 2011151779A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tubular member
- extrusion head
- metal wire
- wire
- pvc
- Prior art date
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Classifications
-
- 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
- A61C17/06—Saliva removers; Accessories therefor
- A61C17/08—Aspiration nozzles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/84—Drainage tubes; Aspiration tips
Definitions
- the present invention concerns a tubular element for suction devices, in particular it concerns a saliva ejector for dentistry.
- the present invention also concerns a method for making the above tubular elements.
- saliva ejectors In dentistry they are commonly used saliva ejectors for draining saliva fluid and other fluids which produces during dentistry works.
- This saliva ejectors are usually composed of a tubular member which at one end fits an opening of a suction device, while at the other end it mounts a tip providing apertures.
- the tubular member is usually made of extruded plasticized PVC in which is embedded a malleable metal wire.
- the malleable wire keeps the tubular member in the desired shape which is obtained by bending the tubular member and it also prevents the collapse of the tubular member under the suction action.
- the wire tends to longitudinally slide with regard to the tubular member due to the forces generated by the bending.
- the wire extends from the end of the tubular member and it may cause wounds to the mucous membranes of the mouth if the tubular member is used without the relative tip, for instance for having a greater sucking action. In addiction, even if the tubular member is used with its tip, the extending wire could hamper the placement of the tip.
- a different solution which is nowadays largely used consists of gluing the metal wire to the tubular member by a specific water based glue.
- this solution has additional producti8on costs.
- the saliva ejectors are conventionally produced by extrusion in plants in which rolls of metal wire are mounted in unwinding machines; the unwound wire is passed through a straightening device and then through cleaning devices, and finally it reaches an extrusion machine made of an extrusion body where granular plasticized PVC is fed and a pulling device. Between the extrusion machine and the pulling device are usually arranged cooling tanks. In order to glue the metal wire to the tubular member, after cleaning, the wire is passed in a tank containing glue so that its surface is covered with glue.
- the water Since a water based glue is used, the water has to be evaporated before the wire enters the melting PVC. In fact, the presence of water during the extrusion process would give origin to gas bubbles having a bad effect on the structure and the aesthetic appearance of the saliva ejector.
- the water is evaporated by passing the wire through an induction device which heats the wire at a temperature among 100 and 150°C which is able to promptly dry the glue.
- a tubular member for suction devices in which said tubular member is a plastic flexible member having a malleable elongated member embedded in its wall, wherein said elongated malleable member has a smooth surface and said tubular member is made of plasticized PVC, whit the tubular member adhering to the malleable elongated member without the need of using any kind of glue.
- the tubular member adheres to the elongated malleable member because of it has, close to the surface of the elongated malleable member, a molecular structure different from the molecular structure that it has in the remaining portions.
- a tubular member in particular of saliva ejectors, as above outlined, adheres to its core, that is the elongated malleable member, in a similar or better way than correspondent tubular members which are glued to the core, so that even when the tubular member is bent, the elongated malleable member do not protrude from the end of the tubular member.
- the lack of gluing substances assures that no toxic substances are used.
- the above objects are obtained by a method for producing e tubular member for suction devices in which said tubular member is a plastic flexible tubular member having a malleable elongated member embedded in its wall, and in which said tubular member is obtained by extruding plasticized PVC in a extrusion head heated at a temperature comprised between 130°C and 190°C and in which a metal wire fed to said extrusion head form said malleable elongated member, said method being characterized in that the metal wire enters the extrusion head at a temperature comprised between 180°C and 600°C.
- the metal wire preferably enters the extrusion head at a temperature between 200°C and 500°C.
- the metal wire enters the extrusion head at the above said temperature, when it come in contact with the PVC it causes structural changes of the PVC at a molecular level which promote the adhesion to the metal wire.
- a saliva ejector comprising a tubular member, 20, according to the present invention, to which can be associated a conventional perforated tip, 30, which is inserted at one end of the tubular member whereas the other end of the tubular member is inserted at the end of a suction device which is part of the tool kit of dentistry work station.
- the tubular member 20 has a total length comprised between 125 mm and 150 mm, with an external diameter comprised between 6,3 mm and 6,7 mm and an internal diameter comprised between 4,2 mm and 4,8 mm.
- the tubular member 20 has embedded within a malleable elongated member, 21, which is usually a smooth steel wire covered with copper or zinc and having diameter of about 1 mm.
- the tubular member 20 is made of PVC plasticized with diottilftalate.
- the plasticized PVC adheres directly to the surface of the metal wire, without the need of interposing gluing substances, and the adhesion force is sufficient to prevent sliding of the metal wire with respect to the tubular member upon bending of the tubular member itself.
- a roll of metal wire is mounted in a unwinding machine, 110, for instance an axial unwinder.
- a walker member having a linear encoder manages the unwinding rate and synchronizes the roll unwinding rate with a pulling device, 170, rate of an extrusion head, 150.
- the metal wire unwound is passed through a straightening device, 120, which eliminates the curves of the wire.
- the surface of the wire is cleaned by passing the wire through several mechanical members, 130, providing cleaning elements covered with plastic sponges.
- the straight wire is then passed through an inductive device, 140, that heats it up to a temperature of about 350°C, or, in any case comprised between 200°C and 500°C.
- the metal wire enters the extrusion head of an extrusion machine, 150.
- the granular plasticized PVC is inserted in the extrusion machine by a hopper and it is progressively heated up to reach a fluid state.
- the extrusion machine is substantially an elongated tank heated by electrical resistances and crossed along by a screw feeder which pushes the PVC towards the extrusion head.
- the extrusion head, 151 is inclined about 90° with respect to the screw feeder which pushes the PVC towards a conveyor, 152.
- the fluid PVC from the conveyor goes into a helicoidal conduit made in the surface of a cylindrical member, 153 which leads the material to a moulding drawing cone, 154.
- a helicoidal conduit made in the surface of a cylindrical member, 153 which leads the material to a moulding drawing cone, 154.
- a further hole, 156 is for the passage of the metal wire which is the malleable flexible member 21.
- the extrusion head 151 is heated by further electric resistances which bring the PVC up to temperatures of about 150°C.
- the tubular member 20 which comes out the extrusion head crosses a set of cooling tanks containing cold water which are able to lower the temperature of the PVC from 150°C to about 15°C in 15 seconds.
- the pulling device 170 which is mad of two counter-rotating belts, which can be vertically set to adjust the traction force, and the belts' drive motor is connected to a potentiometer in the control board.
- a cutter, 180 Downstream the pulling device there is a cutter, 180, for cutting the tubular members at the desired length. Since the tubular members are subjected to cut after the extrusion process, the tubular member in PVC and the metal wire within have exactly the same length so that al so a little mutual sliding movement causes the metal wire to protrude from the end of the tubular member. Also in view of the above the PVC has to perfectly adhere to the metal wire within.
- the production plant can be completed with a tip assembling machine, 190, which mounts the tips at one end of the tubular members and with a packaging machine, 200.
- the wire can be heated before entering the extrusion head by means of different heating devices with respect to the inductive device 140. Further steps of the method, such as the cleaning wire cleaning procedure, the wire unwinding, the cooling of the tubular member in the cooling tanks, or still other steps could be avoided or they could be performed in different ways.
Abstract
A tubular member for suction devices, in particular saliva ejectors composed of a tubular member and a tip, is made of plasticized PVC with a core made of a metal wire. The metal wire has to adhere to the tubular member to avoid longitudinal mutual sliding of the two elements. The adhesion is assured, without using glue, by the molecular structure of the PVC near the surface of the metal wire which is obtained by properly heating the metal wire just before it enters an extrusion head in which the tubular member is created.
Description
The present invention concerns a tubular
element for suction devices, in particular it concerns a
saliva ejector for dentistry.
The present invention also concerns a
method for making the above tubular elements.
In dentistry they are commonly used saliva
ejectors for draining saliva fluid and other fluids which
produces during dentistry works. This saliva ejectors are
usually composed of a tubular member which at one end fits
an opening of a suction device, while at the other end it
mounts a tip providing apertures. The tubular member is
usually made of extruded plasticized PVC in which is
embedded a malleable metal wire. The malleable wire keeps
the tubular member in the desired shape which is obtained by
bending the tubular member and it also prevents the
collapse of the tubular member under the suction action.
Anyway, it has been found that the wire tends to
longitudinally slide with regard to the tubular member due
to the forces generated by the bending. Because of the
above sliding movement after bending the wire extends from
the end of the tubular member and it may cause wounds to
the mucous membranes of the mouth if the tubular member is
used without the relative tip, for instance for having a
greater sucking action. In addiction, even if the tubular
member is used with its tip, the extending wire could
hamper the placement of the tip.
A solution to the problem of preventing the
longitudinal sliding of the metal wire with regard to the
tubular member is proposed for instance in US 3,541,583 in
which the wire is provided with serrations or grooves
which are able to oppose the sliding. This solution, which
anyway is not very effective, causes a raise in the tubular
member production costs as the wire has to be subjected to
specific operations in order to obtain the serrations or
grooves.
A different solution, which is nowadays
largely used consists of gluing the metal wire to the
tubular member by a specific water based glue. Obviously,
also this solution has additional producti8on costs. In
fact, the saliva ejectors are conventionally produced by
extrusion in plants in which rolls of metal wire are
mounted in unwinding machines; the unwound wire is passed
through a straightening device and then through cleaning
devices, and finally it reaches an extrusion machine made
of an extrusion body where granular plasticized PVC is fed
and a pulling device. Between the extrusion machine and
the pulling device are usually arranged cooling tanks. In
order to glue the metal wire to the tubular member, after
cleaning, the wire is passed in a tank containing glue so
that its surface is covered with glue. Since a water based
glue is used, the water has to be evaporated before the wire
enters the melting PVC. In fact, the presence of water
during the extrusion process would give origin to gas
bubbles having a bad effect on the structure and the
aesthetic appearance of the saliva ejector. The water is
evaporated by passing the wire through an induction device
which heats the wire at a temperature among 100 and 150°C
which is able to promptly dry the glue.
It is object of the present invention to
propose a tubular member of a saliva ejector which is able
to overcome the above limits of the prior art.
It is another object of the present
invention to propose a very effective and low cost saliva
ejector.
It is further object of the present
invention to propose a method for making a tubular member
for suction devices, in particular saliva ejectors.
According to an aspect of the present
invention the above objects are obtained by a tubular
member for suction devices in which said tubular member is
a plastic flexible member having a malleable elongated
member embedded in its wall, wherein said elongated
malleable member has a smooth surface and said tubular
member is made of plasticized PVC, whit the tubular member
adhering to the malleable elongated member without the need
of using any kind of glue.
In particular, the tubular member adheres
to the elongated malleable member because of it has, close
to the surface of the elongated malleable member, a
molecular structure different from the molecular structure
that it has in the remaining portions.
A tubular member, in particular of saliva
ejectors, as above outlined, adheres to its core, that is
the elongated malleable member, in a similar or better way
than correspondent tubular members which are glued to the
core, so that even when the tubular member is bent, the
elongated malleable member do not protrude from the end of
the tubular member. In addiction, the lack of gluing
substances assures that no toxic substances are used.
According to another aspect of the
invention, the above objects are obtained by a method for
producing e tubular member for suction devices in which
said tubular member is a plastic flexible tubular member
having a malleable elongated member embedded in its wall,
and in which said tubular member is obtained by extruding
plasticized PVC in a extrusion head heated at a
temperature comprised between 130°C and 190°C and in which a
metal wire fed to said extrusion head form said malleable
elongated member, said method being characterized in that
the metal wire enters the extrusion head at a temperature
comprised between 180°C and 600°C.
The metal wire preferably enters the
extrusion head at a temperature between 200°C and 500°C.
If the metal wire enters the extrusion
head at the above said temperature, when it come in
contact with the PVC it causes structural changes of the
PVC at a molecular level which promote the adhesion to the
metal wire.
Advantageously, upstream said extrusion
head, the metal wire in the unwound configuration is
subjected to subsequent steps of:
- surface cleaning made by mechanical devices; and
- heating at a temperature comprised between 200°C and 600°C obtained by means of an inductive device.
Since the heating of the metal wire causes
the adhesion of the tubular member to the metal wire
itself, there is no need of passing the metal wire through
tanks containing glue.
These and more features of the present
invention will be more easily comprehensible thanks to the
following description of a preferred embodiment of the
invention, given as a non limiting example, with reference
to the accompanying drawings in which:
- figure 1 shows a perspective view of a saliva ejector according to the present invention;
- figure 2 shows a cross section view of the tubular member of the saliva ejector of fig. 1;
- figure 3 shows a block layout of a plant for producing saliva ejectors according to the present invention;
- figure 4 shows a section view of an extrusion head for the production of saliva ejectors.
With reference to fig. 1 it is pointed as
whole with 10 a saliva ejector comprising a tubular
member, 20, according to the present invention, to which
can be associated a conventional perforated tip, 30, which
is inserted at one end of the tubular member whereas the
other end of the tubular member is inserted at the end of
a suction device which is part of the tool kit of
dentistry work station.
The tubular member 20 has a total length
comprised between 125 mm and 150 mm, with an external
diameter comprised between 6,3 mm and 6,7 mm and an
internal diameter comprised between 4,2 mm and 4,8 mm.
As it can be seen in fig. 2, the tubular
member 20 has embedded within a malleable elongated
member, 21, which is usually a smooth steel wire covered
with copper or zinc and having diameter of about 1 mm. The
tubular member 20 is made of PVC plasticized with
diottilftalate.
In the tubular member 20 of the present
invention the plasticized PVC adheres directly to the
surface of the metal wire, without the need of interposing
gluing substances, and the adhesion force is sufficient to
prevent sliding of the metal wire with respect to the
tubular member upon bending of the tubular member itself.
The above happens because close to the
surface of the metal wire the PVC has a molecular
structure which is different from the molecular structure
that it has in the remaining portions. Such molecular
structure is obtained thanks to the method for making the
tubular member according to the present invention which is
disclosed in the following.
With reference to fig. 3, a roll of metal
wire is mounted in a unwinding machine, 110, for instance
an axial unwinder. A walker member having a linear encoder
manages the unwinding rate and synchronizes the roll
unwinding rate with a pulling device, 170, rate of an
extrusion head, 150.
The metal wire unwound is passed through
a straightening device, 120, which eliminates the curves
of the wire.
After straightened the surface of the
wire is cleaned by passing the wire through several
mechanical members, 130, providing cleaning elements
covered with plastic sponges.
The straight wire is then passed through
an inductive device, 140, that heats it up to a
temperature of about 350°C, or, in any case comprised
between 200°C and 500°C.
At a distance of about 800 mm from the
inductive device 140 the metal wire enters the extrusion
head of an extrusion machine, 150. The granular
plasticized PVC is inserted in the extrusion machine by a
hopper and it is progressively heated up to reach a fluid
state. The extrusion machine is substantially an elongated
tank heated by electrical resistances and crossed along by
a screw feeder which pushes the PVC towards the extrusion
head.
As it can be seen in fig. 4 the extrusion
head, 151, is inclined about 90° with respect to the screw
feeder which pushes the PVC towards a conveyor, 152. The
fluid PVC from the conveyor goes into a helicoidal conduit
made in the surface of a cylindrical member, 153 which leads
the material to a moulding drawing cone, 154. Along the
axis of the cylindrical member 153 and the cone 154 there
is a little hole, 155 for the passage of air. The use of
air at a pressure from 0,2 to 0,4 bar prevent the plastic
material exiting the moulding cone from losing its tubular
shape before it solidifies. A further hole, 156, is for
the passage of the metal wire which is the malleable
flexible member 21. The extrusion head 151 is heated by
further electric resistances which bring the PVC up to
temperatures of about 150°C.
With reference to fig. 3 again, the
tubular member 20 which comes out the extrusion head
crosses a set of cooling tanks containing cold water which
are able to lower the temperature of the PVC from 150°C to
about 15°C in 15 seconds.
At the end of the cooling tanks there is
the pulling device 170 which is mad of two
counter-rotating belts, which can be vertically set to
adjust the traction force, and the belts' drive motor
is connected to a potentiometer in the control board.
Downstream the pulling device there is a
cutter, 180, for cutting the tubular members at the
desired length. Since the tubular members are subjected to
cut after the extrusion process, the tubular member in PVC
and the metal wire within have exactly the same length so
that al so a little mutual sliding movement causes the
metal wire to protrude from the end of the tubular member.
Also in view of the above the PVC has to perfectly adhere
to the metal wire within.
The production plant can be completed with
a tip assembling machine, 190, which mounts the tips at
one end of the tubular members and with a packaging
machine, 200.
The above described characteristics and
advantages of a tubular member for suction devices
according to the present invention, and of the method for
making the same, remain unchanged also in case of different
embodiments of the invention.
With reference in particular to the method
for making the tubular members of the invention, the wire
can be heated before entering the extrusion head by means
of different heating devices with respect to the inductive
device 140. Further steps of the method, such as the
cleaning wire cleaning procedure, the wire unwinding, the
cooling of the tubular member in the cooling tanks, or
still other steps could be avoided or they could be
performed in different ways.
These and other changes or modifications
could be carried out to the device and method of the
present invention, still remaining within the ambit of
protection provided by the following claims.
Claims (5)
- Method for making a tubular member (20) for suction devices, in particular saliva ejectors, in which said tubular member is a plastic flexible member having a malleable elongated member (21) embedded in its wall, and in which said tubular member is obtained by extruding plasticized PVC in a extrusion head (151) heated at a temperature comprised between 130°C and 190°C and in which a metallic wire fed to said extrusion head (151) form said malleable elongated member (21) characterized in that said metallic wire enters said extrusion head (151) at a temperature comprised between 180°C and 600°C.
- Method according to the previous claim characterized in that said metallic wire enters said extrusion head (151) at a temperature comprised between 200°C and 500°C.
- Method according to claim 1 or 2 characterized in that upstream said extrusion head (151) said metallic wire in unwind configuration is exclusively subject to subsequent steps of:- surface cleaning made by mechanical devices (130); and- heating at a temperature comprises between 200°C and 600°C made by an inductive device (140).
- Method according to the previous claim characterized in that said heating step is performed at a distance not greater than 1000 mm from said extrusion head (151).
- Tubular member (20) for suction devices, in particular saliva ejectors, in which said tubular member is a plastic flexible member having a malleable elongated member (21) embedded in its wall characterized in that said tubular member is realized by extrusion of plasticized PVC performed in a extrusion head (151) heated at a temperature comprised between 130°C and 190°C and in which said malleable elongated member (21) is a metal wire which is fed to the extrusion head (151) entering it a temperature comprised between 180°C and 600°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITPI2010A000069 | 2010-06-03 | ||
| ITPI2010A000069A IT1400297B1 (en) | 2010-06-03 | 2010-06-03 | CANNULA ASPIRA SALIVA. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2011151779A2 true WO2011151779A2 (en) | 2011-12-08 |
| WO2011151779A3 WO2011151779A3 (en) | 2012-02-16 |
Family
ID=43528394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2011/052372 WO2011151779A2 (en) | 2010-06-03 | 2011-05-30 | Saliva ejector and method for making the same |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | IT1400297B1 (en) |
| WO (1) | WO2011151779A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITUB20161208A1 (en) * | 2016-03-01 | 2017-09-01 | Luciano Grotti | APPARATUS AND METHOD FOR THE PRODUCTION OF ASPIRASAL TUBES |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3541583A (en) | 1967-04-27 | 1970-11-17 | Sherwood Medical Ind Inc | Aspirating device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3086289A (en) * | 1959-07-28 | 1963-04-23 | Orsing John Harry | Saliva ejectors |
| US5460524A (en) * | 1994-06-24 | 1995-10-24 | Anderson; Ross W. | Device and method for saliva suction with tongue retractor and bit handle |
-
2010
- 2010-06-03 IT ITPI2010A000069A patent/IT1400297B1/en active
-
2011
- 2011-05-30 WO PCT/IB2011/052372 patent/WO2011151779A2/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3541583A (en) | 1967-04-27 | 1970-11-17 | Sherwood Medical Ind Inc | Aspirating device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITUB20161208A1 (en) * | 2016-03-01 | 2017-09-01 | Luciano Grotti | APPARATUS AND METHOD FOR THE PRODUCTION OF ASPIRASAL TUBES |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011151779A3 (en) | 2012-02-16 |
| IT1400297B1 (en) | 2013-05-24 |
| ITPI20100069A1 (en) | 2011-12-04 |
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