JP3494616B2 - Bone spreader - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone extender, and more particularly to a bone extender suitable for use in performing bone extension in plastic surgery and the like.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view of an essential part for explaining an example of a conventional bone extender, in which 10 is a bone to be extended and 10 ₁ and 10 ₂ are bones to be extended. 10 is a separated bone fragment, and 1 is one of the bones 10 to be extended.
First plate fixed to _one, 2 second plate fixed to the other bone fragment 10 _second bone 10 to be extended, 3 the tip is in contact with the first plate 1, in the middle A shaft with a screw having a screw 3a portion that is screwed into the second plate 2, and as shown in the figure, the shaft with a screw 3 is screwed into a screw hole of the second plate 2 so as to protrude, and the tip thereof is The first plate 1 is rotatably brought into contact with the first plate 1.

Therefore, as shown, the first bone fragment 10 ₁
When the shaft 3 with a screw is interposed between the second bone fragment 10 ₂ and the _second bone fragment 10 ₂ and the shaft 3 with a screw is rotated, the shaft 3 advances in the direction of arrow A, and the tip thereof is the first bone fragment 10 2. The first plate 1 fixed to _{1 is} brought into contact with the first plate 1
The distance between 0 ₁ and the second bone fragment 10 ₂ is widened, whereby the length of the bone 10 can be extended by L.

FIG. 3 is a diagram showing a state in which a skull is extended by using the above-described bone extender to form a face, and in the figure, a portion having the same action as the member shown in FIG. 2 is shown. Are given the same reference numerals as in FIG. As shown in FIG. 3, when attaching the bone extender as described above between the skulls 10 ₁ and 10 ₂ , the attachment positions of the first plate 1 and the second plate 2 are determined in advance, and the shaft with screw is used. The length and the like of 3 are determined, and these are attached in a preset position in a preset state, and then the shaft with a screw is rotated to widen the interval between the skulls 10 ₁ and 10 ₂ .

Thus, as shown in FIG. 3, the skull 10
_When the face is shaped by widening the interval between ₁ and 10 ₂ , the tip portion 3b of the shaft 3 with a screw protrudes to the front of the face or the like, and this portion is unpleasant and careless. I had a problem with my daily life, such as being hit by an accident.

In order to eliminate the above-mentioned inconvenience (protrusion of the screw shaft), the applicant of the present invention first conceptually shows the protrusion portion of the screw shaft 3 as shown by a chain line in FIG. A flexible portion (preferably a spring) is provided on (the protruding portion from the second fixing plate 2), the protruding portion is bent, and the protruding portion is fixed by the third plate 4 so that the protruding portion is inconspicuous. At the same time, a bone extender was proposed in which no object hits the protruding portion so as not to interfere with daily life.

[0007] Fig. 4 is a schematic view of a main part for explaining an example of the bone extender previously proposed by the present applicant, in which 1 is a first plate, 2 is a second plate, and 3 Is a shaft with a screw thread, and 4 is a third plate.
Same as shown in FIGS. 2 and 3, but in this case
A part of the shaft 3 is formed by a flexible member, preferably a spring 3c, which allows the threaded shaft 3 to bend and the third plate 4 to form the desired bone, as shown in FIG. It is fixed to a piece (10 _{2 in the} illustrated example) so that the tip 3b of the screw shaft 3 does not protrude from the face or the like.

Thus, when the flexible member 3 is a spring as shown in the figure, the spring 3c can constantly apply tension between the bone fragments, and the bone fragment 10 ₁ is gradually increased. By pushing, more effective bone extension can be achieved.

FIG. 5 is a detailed view showing the structure of the contact portion between the first plate 1 and the screw shaft 3 shown in FIG.
The plate 1 has a recess 1'that abuts against the tip of the shaft 3, and the recess 1'has a tapered shape such that the tip has a small diameter. The tapered tapered shape 3'is formed so as to be engaged with the tapered concave portion 1 ', whereby the tip end portion 3'of the shaft 3 is engaged with the tapered concave portion 1'of the first plate 1. The shaft 3 is rotatably abuttably engaged with the first plate 1.

FIG. 6 is a view for explaining the details of the screw shaft 3 described above. As described above, the screw shaft 3 engages with the recess 1'of the first plate 1 at the tip end portion thereof. 3'and a screw portion 3 "screwed into the screw hole of the second plate 2
And a second screw shaft 3b having a screw portion that is screwed into the screw hole of the third plate 4, and these first screw shaft 3a and second screw shaft. 3b, and a flexible member, preferably a spring 3c, which connects the first shaft 3a with a screw and the shaft 3b with a second screw, and is preferably a spring ( The spring part) 3c can be bent.

The mounting positions of these first to third plates are predetermined by performing a precise inspection in advance, and therefore the length of the screw shaft 3 is also predetermined. Pre-assemble,
The plates 1, 2 and 4 are fixed at predetermined positions, but when the flexible portion 3c is formed of a spring as shown in the drawing, the screw shafts 3a and 3b and the spring 3c are separated from each other. Alternatively, the ends of the springs may be screwed into the thread grooves of the screw shaft, and the screw threads at the tip of the screw may be crushed to connect the screw shafts 3a and 3b to the spring 3c. .

Then, as shown in FIG. 5, a spring is used as the flexible member, and the spring is wound (compressed) to press the screwed shaft 3a against the first plate 1. In such a case, the spring 3c is constantly subjected to a force in the direction of pushing the first plate 1 away from the second plate 2, and the spring 3c can be gradually expanded between the bone fragments 10 ₁ and 10 _2. , Effective bone extension can be performed. In this case, the screw shaft 3b is fixed so as not to rotate.

[0013]

Therefore, in the above-mentioned bone extender previously proposed by the present applicant, when the first bone fragment 10 ₁ and the second bone fragment 10 ₂ are in the same plane (two-dimensional In the case where there is a step between the first bone fragment 10 ₁ and the second bone fragment 10 ₂ (three-dimensional case), it cannot be applied. The range was narrow.

The present invention has been made in view of the above circumstances, and in particular, it is to provide a bone extender suitable for use in widening a gap between stepped (three-dimensional) bone fragments. It was done for the purpose.

[0015]

According to a first aspect of the present invention, there is provided a first plate fixed to one bone piece, a second plate fixed to the other bone piece, and a tip of the first plate. A shaft that is brought into contact with and engaged with a plate, a first screw shaft that is screwed into the second plate and extends, and the shaft and the first plate between the first plate and the second plate. A spring that connects the shaft with screw 1 and further,
A third plate fixed to an arbitrary bone fragment, and a second screw shaft which is screwed to the third plate and extends
The first plate is provided between the second plate and the third plate.
Consists shaft with the screw and the second variable <br/> FLEXIBLE elastic member you connected the threaded shaft, rotation of said first shaft with screw by rotating the second threaded shaft Then, the distance between the one bone fragment and the other bone fragment is widened.

[0016]

[0017]

According to a second aspect of the invention, in the first aspect of the invention, a screw is formed on one end side of the shaft,
The end portion of the spring is screwed and connected to a screw groove of a screw shaft including the shaft.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of an essential part for explaining an embodiment of a bone spreader according to the present invention. The bone spreader according to the present invention has bone fragments 10 ₁ and 10 having a step H. ₂ (three-dimensional bone fragment) is configured to be able to widen the space L. In the present invention, the screw shaft 3 has a _{first end} fixed to the first bone fragment 10 1. First (with screw) abutting and engaged (or fixed) with the plate 1 of
The shaft 3 ₁ , the second screw shaft 3 ₃ screwed to the second plate 2 fixed to the second bone piece 10 _2, and fixed to any desired bone piece including the bone piece 10 _2. that the third and the third shaft ₃₅ with screws screwed in plate 4, the first absence purine grayed 3 to connect the (threaded) shaft 3 ₁ and the second threaded shaft 3 _{3 2,} the second shaft 3 ₃ with screws and the third shaft with the screw ₃₅ and you connected the variable Shiwasei member (e.g., spring) 3 consists ₄ which, as with the prior art described above, the third By rotating the shaft with screw 3 ₅ , the second shaft with screw 3 ₃ is rotated,
Of the threaded shaft 3 ₃ extruded into the first bone fragment 10 ₁ direction, increase the distance L of the bone pieces 10 ₁ of the first and the second bone fragment 10 _2.

Therefore, in the present invention, the tip is the first
First (screwed) shaft 3 engaged with plate 1 of
₁ and is connected between the gas purine grayed 3 ₂ of the second shaft 3 ₃ with screws screwed into the second plate 2, whereby, the first bone fragment 10 ₁ and the second bone fragment Step H between 10 ₂
Even if there is, the distance L between the first bone fragment 10 ₁ and the second bone fragment 10 ₂ can be obtained. Also in this case, a screw is provided on the connection side of the first shaft 3 _{1 with} the spring 3 _2, and the spring is provided in the thread groove of the screw portion of the first shaft 3 _{1 and} the screw portion of the second shaft 3 _3. By screwing the end of 3 ₂ and crushing the screw thread at the tip of the screw,
The shafts 3 ₁ and 3 ₃ may be connected by a spring 3 ₂ , and by doing so, the length of the spring 3 ₂ can be adjusted in advance according to the distance L, and more effectively, The spacing between the bone fragments can be increased.

[0021]

As is apparent from the above description, according to the present invention, even if there is a step between the bone fragments for which the distance is to be widened, the bone fragments are connected by the spring . Despite the step, the space between these bone fragments can be effectively widened , and in particular , by adjusting the length of the spring in accordance with the space between the bone fragments, the size and width of the step can be increased. It is possible to more effectively respond to the intended interval.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram for explaining one usage state of a bone extender according to the present invention.

FIG. 2 is a schematic configuration diagram for explaining an example of use of a conventional bone extender.

[Fig. 3] Fig. 3 is a diagram showing a comparison of specific usage examples of a conventional bone extender and the bone extender previously proposed by the present applicant.

FIG. 4 is a view for explaining an example of use of the bone extender previously proposed by the applicant.

FIG. 5 is a diagram showing a configuration of a distal end portion of a bone extension shaft previously proposed by the applicant.

FIG. 6 is a configuration diagram showing an example of a bone extension shaft previously proposed by the applicant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st plate, 1 '... taper-shaped recessed part, 2 ... 2nd plate, 3 ... bone extension shaft, 3' ... tip tapered part,
3 ″ ... screw part, 3 ₁ ... first shaft with screw, 3 ₃ ... second
Bone screws with a shaft of, 3 ₅ ... third of the shaft with the screw,
3 ₂ , 3 ₄ ... Flexible member (spring), 4 ... Third plate, 10 ₁ , 10 ₂ ... Bone fragments.

Claims (2)

(57) [Claims] 1. A shaft which is fixed to one of the bone pieces, a second plate which is fixed to the other bone piece, and a tip of which a tip is brought into contact with and engaged with the first plate. And a first screw shaft that is extended by being screwed into the second plate, and connects the shaft and the first screw shaft between the first plate and the second plate.
A spring , a third plate fixed to an arbitrary bone fragment, and a second plate which is screwed to the third plate and extends.
Of the threaded shaft consists of a second plate and the third plate and the first threaded shaft and second flexures variable you connected the threaded shaft of the elastic member between said first The bone extender characterized in that the first screw shaft is rotated by rotating the second screw shaft so as to widen the space between the one bone fragment and the other bone fragment. 2. A screw is formed on one end side of the shaft, and an end portion of the spring is screwed and connected to a screw groove of a screw shaft including the shaft. The bone extender according to 1 .