Dentistry – Orthodontics – Including extra-oral force transmitting means
Patent
1996-07-10
1998-08-18
Swiatek, Robert P.
Dentistry
Orthodontics
Including extra-oral force transmitting means
A61C 700
Patent
active
057951497
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for attaching an orthodontic unit and to an orthodontic unit that incorporates such device.
2. Description of Background and Relevant Information
In dentistry, one is led to exert a tensile force on a tooth. The equipment that is used comprises two portions: an endobuccal portion anchored on the tooth to be straightened, and an exobuccal portion, or traction unit, connected to the first and making it possible to exert a force on the tooth.
The traction unit is connected through one of its ends to the tooth to be straightened, and is fixed to the patient through its other end.
The portion that is fixed to the patient is constituted by a yoke-shaped element engaged through one of its arms in the unit body. If the tensile force exceeds a predetermined value, the yoke can escape from the unit body. Such a unit is described in the French patent application no. 93 07360, filed on Jun. 14, 1993 in the name of the applicant.
The yoke is fixed, through its median portion, on a protective pad. This pad can constitute a nape band or a portion of a headband. This pad is adapted to prevent the traction unit from injuring the patient.
As the aforementioned pad is made out of a padded textile material, the median portion of the yoke is confined in a buckle made of a textile material that ensures the attachment of the unit on said pad.
Experience has shown that the protective pad is not totally efficient in view of the fact that the traction unit, maintained on the pad through only one of its ends, is very free; it can pivot at this end and reach the patient's skin.
A prior solution consisting of increasing the surface of the pad does not make it possible to remedy this problem. Indeed, if the dimensions of the pad are increased, the cost thereof is increased in the same proportion. Moreover, if the cost-related problem is neglected, the aforementioned solution cannot be implemented in a satisfactory manner, because if the pad is too large, the latter causes a discomfort to the patient.
SUMMARY OF THE INVENTION
An object of the present invention, which remedies the aforementioned disadvantages, is to provide the protective pad with an arrangement that renders it possible to limit the pivoting of the traction unit.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood along the following description, made in reference to the annexed drawing, provided by way of a non-limiting example only, in which:
FIG. 1 shows a usual pad, used as a nape band, that includes its two traction units;
FIG. 2 is a cross-sectional view taken along the line II--II of FIG. 1, the unit body being uncut;
FIG. 3 is a view similar to FIG. 1, showing the implementation of the device of the invention; and
FIG. 4 is a cross-sectional view taken along the line IV--IV of FIG. 3, the unit body being uncut.
DETAILED DESCRIPTION OF THE INVENTION
With reference to the drawing, pad 1 forms a nape band, on which two traction units of a known type are fixed. Each unit is formed by the association of two portions 2 and 3.
The portion 2 forms the unit body in which the yoke-shaped element 3 is engaged. Each unit is attached to the pad 1 by means of a buckle 4 confining the median portion 3a of the yoke (see FIG. 2), and made by means of a strip of fabric sewn on the pad 1, for example. If the value of the traction to which the unit is subjected exceeds a predetermined value, the two elements 2 and 3 separate from one another. This technique is well-known.
It appears from the foregoing description that the unit can pivot in the plane of the pad 1 and escape from its protective action. The detrimental effects of this displacement are increased when one uses more improved units, such as that described in the aforementioned French patent application, because their length is much greater than that of the unit shown in the drawing.
According to the invention, one remedies this disadvantage by providing on the pad 1 a means for limiting th
REFERENCES:
patent: 4226589 (1980-10-01), Klein
patent: 4392825 (1983-07-01), De Woskin
patent: 4427380 (1984-01-01), Carter et al.
patent: 4600382 (1986-07-01), Forster
patent: 4734032 (1988-03-01), DeWoskin
AIDA International
Swiatek Robert P.
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