Dentistry – Apparatus – Having suction orifice
Patent
1996-05-01
1997-12-16
Wilson, John J.
Dentistry
Apparatus
Having suction orifice
493269, A61C 1706
Patent
active
056977867
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a flexible paper tube, in particular a throw-away saliva suction unit for dentistry, comprising two tubular sections integrally joined with another via a bellows.
A paper tube of this type is known in the art from German utility model G 92 16 033.6.
Tubes having cylindrical sections integrally joined to another via a bellows have been used for some time by dentists during dental treatments in order to extract saliva from the oral cavity of the patient through one of the tubular sections with the assistance of a vacuum device connected to the other tubular section in order to prevent flooding of the oral cavity with saliva and to guarantee proper visual working conditions for the dentist. These types of saliva suction or vacuum units must be water resistant at least for a certain period of time to prevent soaking-through during the treatment time of the patient. In addition the bellows located in the mid-region of the saliva suction unit must facilitate flexibility of the device in order to bring the suction tubular end into the region of the floor of the mouth of the patient from above with the vacuum device being arranged at the side and usually below the patient. This can only be achieved by bending the bellows through a relatively large bending angle.
For reasons of structural integrity, conventional saliva vacuums have utilized, up to this time, either a metal tube or plastic tube with associated bellows. Metallic saliva vacuum units had the disadvantages of being costly, and nevertheless of limited life-time and are associated with the difficulties and expenses of cleaning, disinfecting, and sterilizing. Plastic saliva suction units which, for hygienic reasons, could be utilized as throw-away articles were, in contrast thereto, less expensive, however had problems related to disposal thereof.
Cardboard throw-away saliva suction units had already been used more than 50 years ago at a time when plastic was not yet of today's quality nor available at today's usually low prices which, however, had wire inlays in their walls to substantially maintain the tube passage along the entire length of the saliva suction unit when the tube was bent. The wire insert caused this type of saliva suction unit made from cardboard or fibre materials to be relatively expensive to manufacture and did not present a substantial improvement with regard to the disposal problem in comparison to corresponding modern throw-away saliva suction units made from plastic.
The saliva suction unit described in the above mentioned utility model G 92 16 033.6 made from paper mache, statuary paste board, pressboard, cardboard or paper materials was intended to be manufactured by forming and/or pressing in a cardboard mould and subsequent shaping into a tube. It was already envisioned that a section of the tube be formed as a bellows to give the tube a certain amount of flexibility so that the tube was bendable or foldable in the bellows region without reducing the cross sectional passage of the tube.
This, however, was only possible in the device described in this publication when a stiffening of the tube walls was provided by means of a wire insert since otherwise the single layer tube would fold-up in the bellows region or an appropriate bellows could simply not be manufactured using a single layer tube made from paper mache, statuary paste board, pressboard, cardboard or paper materials.
It is therefore the purpose of the present invention to present a flexible paper tube of the above mentioned type which guarantees full maintenance of the tube passage without wire inserts when flexing the tube through bending of the bellows.
SUMMARY OF THE INVENTION
This purpose is achieved in accordance with the invention in that the paper tube is constructed from multi-layer paper, in particular having 3 through 15 layers and preferentially 4 through 10 layers with thickness of 0.07 mm to 0.35 mm, in particular 0.1 to 0.2 mm and having a wall thickness between 0.2 to 2.5 mm, preferentially 0.5 to
REFERENCES:
patent: 2094568 (1937-09-01), Friedman
patent: 2327337 (1943-08-01), Gibbin
patent: 3025004 (1962-03-01), Levi
patent: 3339004 (1967-08-01), Nardone
patent: 5476630 (1995-12-01), Orsing
Lange-Mickel Gertrud
Morsch Paul
Wahl Gebhard
Albert Eger GmbH & Co.
Vincent Paul
Wilson John J.
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