Osteotomy Surgical Instrument

Abstract

An attainment with an osteotomy surgical instrument for the nasal osteotomy is described; it is set up of at least a couple of lever arms and a couple of sharp spouts that are mutually hinged at least in a rotation fulcrum, where said sharp spouts show an active portion with the cross sectional having a sharp angle, in which the sharp angles of the two sharp spouts are opposed and said active portion extends for a length greater than 30 mm and shorter than 45 mm.

Claims

1. Surgical instrument for nasal osteotomy, set up of at least a couple of lever arms and a couple of sharp spouts mutually hinged at least in a rotation fulcrum, wherein said sharp spouts show an active portion with cross sectional having acute angle, in which the acute angles of the two sharp spouts are opposed and said active portion extends for a length greater than 30 mm and shorter than 45 mm.

2. Surgical instrument of claim 1, wherein said active portion of the sharp spouts shows a cross width lower than 3 mm.

3. Surgical instrument of claim 1, wherein said active portion of the sharp spouts shows a sharp edge having an angle lower than 30.

4. Surgical instrument of claim 3, wherein said blade edge extends on a straight line or on a slightly curved line.

5. Surgical instrument of claim 4, wherein an apical part of said sharp edge shows a curvature towards the front side of the instrument, that projects out of the plane of the remaining edge approximately by 3 mm.

6. Surgical instrument of claim 1, wherein one of the said sharp spouts shows a sharp edge while the other of said sharp spouts shows a corner in which a groove having a triangular section is made, that is suitable to move with the vertex of the opposed sharp edge.

7. Surgical instrument of claim 1, wherein said lever arms are hinged in a first fulcrum and they extend into transmission spouts, on their turn being articulated with related articulation pins to a second couple of articulated lever arms in a second fulcrum and that extends in said sharp spouts.

8. Surgical instrument of claim 1, wherein elastic stressing means between said lever arms are provided, that exercise a stretched elastic action to carve mutually said sharp spouts.

Description

SHORT DESCRIPTION OF THE DRAWINGS

[0019] Further features and advantages of the invention will be anyway better apparent from the following detailed description, as a pure example and not limiting and it is explained in the attached drawings, in which:

[0020] FIG. 1 is a front elevation view of a surgical instrument according to an illustrative version of the model, in an open position;

[0021] FIG. 1A is a side, interrupted, elevation view, of the cut apical part of the model;

[0022] FIG. 2 is view like that of FIG. 1, with the instrument in a closed position;

[0023] FIG. 2A is a section view along the line A-A in FIG. 2, with a partial magnification enclosed in the dashed circle; and

[0024] FIG. 3 is a schematic pictorial view, not to scale, showing the ways of use of the instrument according to the model.

DETAILED DESCRIPTION OF AN ILLUSTRATIVE VERSION

[0025] In FIG. 1 a manual forceps P is shown composed of an illustrative known configuration. Two first lever arms 1 and 2 are mutually hinged as a scissor in a first fulcrum pin 3.

[0026] On the opposite side of the first fulcrum 3, the first lever arms 1 and 2 continue with short transmission spouts, 4 e 5 respectively, articulated in turn with related articulation pins 4a and 5a to a second couple of lever arms, 6 e 7 respectively, also mutually articulated as a scissor in a second fulcrum pin 8.

[0027] On the opposite side of the second fulcrum 8, the second lever arms 6 and 7 continue with sharp spouts 9 and 10.

[0028] Between the first two lever arms 1 and 2 preferably elastic back means are provided, for example harmonic reeds 1a and 2a, that stress the forceps in an open position, i.e. in a position in which the sharp spouts 9 and 10 are mutually retracted (as in FIG. 1). Intervening manually on the lever arms 1 and 2 to close the forceps and exercise the desired pressure action between the two sharp spouts 9 and 10 (FIG. 2), the harmonic reeds 1a and 2a are loaded to bring the forceps forward in the open position as soon as the manual action is released.

[0029] This forceps configuration is particularly effective to amplify the force applied on the lever arms 1 and 2 on the sharp spouts 9 and 10, but it does not exclude that even an alternative configuration may be used that supplies an analogous transmission effectiveness of the forces without providing two fulcra 3 and 8.

[0030] According to the model, each sharp spout 9 and 10 shows an active portion having an acute angle cross section (see figure FIG. 2A), as a typical blade, with the vertices of the acute angles of the two spouts that are mutually opposed.

[0031] Therefore, each one of the two sharp spouts 9 and 10 shows one sharp edge having an acute angle, preferably lower than 30.

[0032] According to a preferred variation, one of the two sharp spouts 9 shows a sharp edge 9, while the other one 10 shows a corner 10, in which a groove having a triangular section is made being able to match up with the vertex of the opposed sharp edge (see the magnification of FIG. 2A). This configuration has proved to be particularly effective to carve as desired the nasal bone in the osteotomy operation.

[0033] As an alternative, the spouts 9 and 10 may provide blades that are composed of a double sharp blade on both sides.

[0034] For the specific nasal osteotomy, advantageously at least the active portion of the sharp spouts 9 and 10 extends for a length not shorter than 30 mm and not longer than 45 mm, preferably it is 35 mm. The width, in the elevation front view of FIG. 1, of each sharp spout 9 and 10 is as thin as possible, consistent with the material which it is built up of, in order not to be excessively intrusive in the introduction of the nose tissues, for example a width lower than 3 mm.

[0035] The blade of the acute angle corners extends on the active portion according to the straight line or according to a slightly curved line.

[0036] Preferably, the apical end of the sharp spouts 9 nd 10 shows a slight curvature towards the front side, as it is well shown in the side view of FIG. 1A, for example a curvature that projects 3 mm approximately from the plane on which the blade of the main portion of the spouts 9 and 10 lies.

[0037] With this configuration, the dimensions of the sharp spouts is sufficiently restrained to make their introduction in the desired site inside the nasal cavity possible, in both its side wall and in the side portion of the upright branch of the upper jaw near the nasal bone (see FIG. 3); at the same time, it is possible to carry out the nasal osteotomy with a short manual pressure intervention on the lever arms 1 and 2, without making the surgical instrument advance or without handling it, this makes the surgical operation easier, repeatable and quick.

[0038] As it is understood from the above-mentioned description, the surgical instrument according to the invention perfectly achieves the goals shown in the preliminary remarks. It is indeed possible to carry out nasal osteotomy operations in an easy and quick way, without using any chisel or saw, that need a remarkable expertise and operation dexterity.