FR2820304A1 - Surgical scalpel blade for use in dentistry has symmetrical cutting tip set at angle to handle - Google Patents

Abstract

The scalpel blade, designed to be fitted to a handle or sealed to a plastic handle for a completely disposable instrument, has a symmetrical spatula-shaped transverse cutting tip (B) lying at an angle of 45 deg to the axis (C) of the handle. The end (D) of the tip is rounded and sharpened along both side edges (D1, D2), and it lies on the axis of the handle or overlaps it by 1 - 5 mm.

Description

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The present invention relates to a surgical scalpel blade designed for periodontic procedures, and more particularly, for incising in the gingival tissues located in the areas posterior to the tooth.

As a rule, a surgical scalpel blade is made in such a way that it has only one sharp edge, almost parallel to the axis of the handle, and in the same plane as this axis. Consequently, when the practitioner needs to make incisions that are precise, fine and sinuous, he is forced to tilt the scalpel substantially upward, in order to work with the tip of the instrument.

This state of affairs makes it impossible to make such incisions in the areas of the mouth that are the most difficult to access (areas of the rear mouth, contours of the wisdom teeth, etc.). Indeed, the anatomy does not allow working behind the mouth with a scalpel in an almost vertical position, but on the contrary obliges the practitioner to hold his instrument in a lower position (closer to the horizontal), which prohibits cuts that are both precise and sinuous, since we do not work with the tip of the instrument, and increase the risk of unnecessary, uncontrolled or dangerous cuts.

This is even more evident when it comes to incising in the posterior gingival areas, along the distal face of the tooth. In this case, the surgeon is forced to work, and to present the scalpel, along an axis perpendicular to the maxillary axis, that is to say by the side of the mouth, which makes the act impossible for the teeth located. the most posterior (premolars, molars and wisdom teeth), since it is hampered by both the cheek and the opposite maxilla.

The scalpel blade according to the invention overcomes these drawbacks.

Indeed, according to a first characteristic, its sharp part is in the form of a contra-angle, inspired by the modeling spatulas traditionally used in dentistry. This allows the surgeon to tilt the scalpel down to reach the most difficult places to reach the mouth, while maintaining an angle of attack of the blade sufficiently vertical to work with its tip (fig. 2), and thus authorize scalloped and precise cuts in these places.

According to a second characteristic, the end of said blade is sharpened symmetrically on its two edges. Its incision axis then invariably becomes perpendicular to that of the handle. This allows, on the one hand, to reach the areas posterior to the tooth by introducing the scalpel by the front of the mouth (and no longer only by the sides) and on the other hand, to incise properly along the distal and lingual sides, perfectly following the gingival contours.

The end of said blade is found on the axis of the handle (or cuts this axis from 1 to 5 millimeters), in order to be able to handle the instrument as easily as a pencil and to direct the incision by simple rotation of the handle between the fingers.

This sharpened end is rounded, which makes it possible to incise in the tissue along a vertical axis and without causing tearing.

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The accompanying drawings illustrate the invention: Figure 1 (fig. 1) illustrates said blade (top and side view) with its dimensions.

FIG. 2 illustrates said blade fixed on a handle and seen from four different angles.

With reference to FIG. 1, said scalpel blade comprises a part (A) intended for its attachment to a standard handle, according to international standard ISO 7740, and the dimensions of which are defined below. According to a variant not illustrated, said blade can be sealed in a plastic handle, making the complete instrument disposable, and then no longer showing the fixing part (A).

The cutting part (B) is perfectly symmetrical, on either side of an imaginary plane defined by the axis of the handle (C) and the working axis of the blade (E). It is composed of two segments arranged at right angles, so that said blade has the shape of a spatula in contra angle traditionally used in dentistry, and that its working axis (E) is different from that of the scalpel handle (C).

The end (D) of the segment (B2) is rounded.

This segment is symmetrically sharpened on its two edges (Dl and D2) and on its end (D).

The cutting axis (F) is thus perpendicular to the axis of the scalpel handle (C) and to the working axis of the blade (E).

According to a multitude of variants not illustrated, the end of said blade and its sharpening can have different shapes (more or less rounded or pointed).

The end (D) of said blade, whatever its shape, is on the axis (C) of the scalpel handle, or cuts this axis from 1 to 5 millimeters.

The object is necessarily produced in surgical steel (for example grade Z 70 CD 14, according to international standard ISO 7153-1 or French standard NF S 90-451), then sterilized according to the processes used in the manufacture of blades surgical scalpels.

By way of nonlimiting example, said blade will have the dimensions given in the table below, with reference to FIG. 1.

In millimeters and degrees:

<Tb>
<tb> a <SEP> b <SEP> c <SEP> d <SEP> e <SEP> f <SEP>&alpha;#<SEP>
<tb> 10.4 <SEP> 7.2 <SEP> 4.5 <SEP> 17.9 <SEP> 10 <SEP> 15.2 <SEP> 35 <SEP> 45 <SEP> 8
<Tb>

La lame de bistouri selon l'invention est particulièrement conçue pour inciser dans les zones gingivales postérieures à la dent.

The scalpel blade according to the invention is particularly designed for incising in the gingival areas posterior to the tooth.

Claims (6)

 -1-Surgical scalpel blade allowing incisions in the gingival areas posterior to the tooth, characterized in that its sharp part (B) resumes the shape of a modeling spatula, in contra angle, traditionally used in dentistry.

- CLAIMS -  -2-Surgical scalpel blade, according to claim 1, characterized in that its cutting part (B) is symmetrical.  -3-Surgical scalpel blade, according to claim 1 and claim 2, characterized in that its end (D) is rounded and symmetrically sharpened on its two sides (Dl and D2).  4-Surgical scalpel blade, according to any one of the preceding claims, characterized in that its end (D) is found on the axis (C) of the scalpel handle, or cuts this axis from 1 to 5 millimeters.  -5-Surgical scalpel blade according to claim 3 and claim 4, characterized in that the sharpened end (D) is in the shape of a point.  -6-Surgical scalpel blade according to any one of the preceding claims, characterized in that it is sealed in a plastic handle, making the complete instrument disposable (blade and scalpel handle).