Dentistry – Apparatus – Having suction orifice
Patent
1996-08-08
1998-04-28
Wilson, John J.
Dentistry
Apparatus
Having suction orifice
A61C 1706
Patent
active
057437360
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement for a saliva ejector utilized in dental treatment in the oral cavity and more exactly the present invention relates to a saliva ejector comprising a flexible tube without using PVC material and without embedding of metal or corresponding flexible stiffening material.
PRIOR ART
In different treatments within dental care a saliva ejector is usually used to suck saliva and also blood which may be met in smaller surgical operations, as well as different fluids eventually being used for rinsing the oral cavity in connection with the treatment. Such a saliva ejector normally consists of a flexible tube having one or more suction ports in a first end and the other end being connected to a suction tubing.
The most common available saliva ejectors, which are disposable and on 2 yearly basis are made and used in millions of sets by dentists all over the world, have a small hood of PVC, which comprises in part a cage like portion of a larger or smaller length and in part a sleeve portion. The sleeve of the latter portion is slipped onto the suction tubing at its first or the suction port end, such that the cage covers the end of the conduit of the suction tubing. The cage then has the purpose of keeping the soft parts of the oral cavity at a distance from the suction opening of the suction tubing when the saliva ejector with the hood is resting on the lower jaw. The tubing itself is normally formed by some plastic material, in most cases PVC plastic, and provided with an embedded stiffening wire of some other material such as metal.
A typical such arrangement for a saliva ejector is described in the Swedish patent document SE 423 672 filed Jan. 25, 1978. This document discloses a saliva ejector constituting a flexible formable suction tubing having an end portion designed with a row of through holes and being bent double. The tubing itself is made of polyethene and is provided with an embedded wire to obtain the desired plasticity.
Another document SE 415 859 filed Jan. 12, 1979 discloses a corresponding suction tubing which also presents a stiffening metal wire embedded into the plastic material.
In the Swedish patent document SE 435 338 is additionally disclosed a variant wherein the suction tubing consists of a plastic tube where at least one portion of the tube is provided with ridges and intermediate grooves. Preferably the ridges and grooves consist of bellow like folds having sides of different length such that the more narrow sides may be snapped in under the more broad sides upon compressing the bellow like portion. In this manner, the bellow like portion enables a forming of bends on tube consisting of polyethene or polystyrene.
U.S. Pat. No. 2,519,595 further discloses a saliva ejector comprising a Y-formed tube piece which facilitates a double sided saliva ejector, whereby one arm of the Y-formed tube piece presents a ball joint for adjustment of the distance between the two branches of the saliva ejector.
A drawback of saliva ejectors forming disposables according to the state of the art is, in accordance with the examples mentioned above, that the arrangements almost entirely consist of extruded PVC plastic having an imbedded metal wire. In this connection problems arise since the plastic is not simply recoverable, which is an environmental demand growing substantially stronger. Simultaneously the use of the economically cheaper PVC plastic implies further drawbacks as seen from the environmental point of view.
Therefore there is a requirement of a disposable arrangement, cheap in price, in form of a saliva ejector which in part may be produced from a more environmentally friendly material than previously, which at the same time does not contain any metal obstructing recycling of the material, and which exhibits desired flexible bending qualities and yet maintains a defined stiffness upon forming after the appearance of the oral cavity. The shape is maintained also at stresses which may be created when the arrangement is resting against
REFERENCES:
patent: 950109 (1910-02-01), Levkowicz
patent: 1471207 (1923-10-01), Riddle
patent: 2519595 (1950-08-01), Older
patent: 4417874 (1983-11-01), Andersson et al.
Albertsson Christer
Folko Matts
Wilson John J.
Zirc Company
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