JPH0613038B2 - Skull bone valve fixation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cranial bone valve fixing device used for reducing a cranial bone valve.

[0002]

2. Description of the Related Art Usually, when reducing a skull bone valve after surgery, a small hole is drilled by a bone drill in the peripheral portion of a bone valve 1 and a bone window 3 formed in a skull 2 as shown in FIG. After that, a thin steel wire (or silk thread) 4 was passed through the hole and ligated to fix the bone flap 1 to the peripheral edge of the bone window 3.

[0003]

However, in the above-described conventional method for fixing a bone valve, it is necessary to make a small hole with a bone drill and to ligate the steel wire 4 through this hole. It takes a long time to reduce,
There was also a problem that drilling with a drill further increased the risk of injury to the dura and brain cortex.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to quickly open a bone flap without drilling a hole or using a steel wire or silk thread. Another object of the present invention is to provide a skull bone valve fixing device capable of stable and reliable fixation.

[0005]

In order to achieve the above object, the present invention holds the upper and lower surfaces of the peripheral edge of the bone valve and the upper and lower surfaces of the peripheral edge of the bone window to fix the bone valve to the edge of the bone window. The first holding plate has a band extending in the center of the upper surface and at least one surface of which has a bite formed thereon, and the second holding plate has a band through which the band is inserted. It has an insertion hole and a stopper which meshes with the teeth and prevents the second holding plate from moving in the direction of coming out of the band.

[0006]

In the present invention, the first holding plate is brought into close contact with the lower surface of the peripheral edge of the bone valve and the lower surface of the peripheral edge of the bone window. The band is projected to the outside from a gap provided between the bone flap and the bone window and inserted into the band insertion hole of the second holding plate. The second holding plate is brought into close contact with the upper surface of the peripheral edge of the bone flap and the upper surface of the peripheral edge of the bone window,
The upper and lower surfaces of the peripheral edge of the bone flap and the upper and lower surfaces of the peripheral edge of the bone window are sandwiched together with the first holding plate to fix the bone flap to the edge of the bone window. The teeth of the band and the stopper of the second holding plate mesh with each other to fix the second holding plate to the band so as to be movable only in the direction of holding the bone valve, and prevent the second holding plate from loosening. .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing an embodiment of a skull bone valve fixing device according to the present invention, and FIG. 2 is a sectional view showing a state where the bone valve of the device is fixed. In these figures, a skull bone valve fixing device, generally designated by the reference numeral 10, holds the upper and lower surfaces of the peripheral edge portion of the bone valve 1 and the upper and lower surfaces of the peripheral edge portion of the bone window 3 to sandwich the bone valve 1
First and second holding plates 11 and 1 for fixing the to the peripheral edge of the bone window 3
Equipped with 2.

The first holding plate 11 is made of a material that is physically and chemically stable and does not cause any biological reaction, such as silicon dioxide.
It is formed in a rectangular shape by an inner wall, has an appropriate plate thickness, has flexibility, and is preferably curved with a curvature substantially the same as the curvature of the skull 2 so that the upper surface side is convex. Also, the first holding plate 1
At the center of the upper surface of the band 1, a band 13 is integrally extended upward. The band 13 is provided orthogonally to the longitudinal direction of the first holding plate 11, and a large number of teeth 14 are arranged in parallel on one surface over substantially the entire length. The teeth 14 are formed in a sawtooth shape of a right-angled triangle in a side view, so that the teeth 14 are inclined downward to the right in FIG. 2 at an appropriate angle and a horizontal bottom surface 14b.
And left and right side surfaces 14e.

Like the first holding plate 11, the second holding plate 12 is formed of silicone or the like into a rectangular shape having substantially the same size, has an appropriate plate thickness and flexibility, and preferably has an upper surface. It is curved with a curvature substantially the same as the curvature of the skull 2 so that the side is convex. In addition, a rectangular tube-shaped convex portion 15 having a band insertion hole 16 through which the band 13 is inserted is integrally provided at the center of the lower surface of the second holding plate 12. Convex 15
Has a height H that is approximately equal to or slightly smaller than the plate thickness T of the bone valve 1, and a radiation w that is approximately equal to or slightly less than the width d of the gap G between the bone valve 1 and the bone window 3. A stopper 17 which is engaged with the teeth 14 of the band 13 and prevents the second holding plate 12 from moving in the anti-clamping direction, that is, the direction separating from the first holding plate 11 is integrally provided inside. ing. As shown in FIG. 2, the stopper 17 is provided so as to be inclined downward to the right, and is elastically deformable (rotatably) connected to the lower end side opening edge of the convex portion 15 by a hinge portion 18 having a thin lower end. , Open direction, ie teeth 14 of band 13
It has been given a habit of returning to the direction of meshing with. Further, an appropriate number, for example, three teeth 19, which mesh with the teeth 14 are integrally formed on the outer surface of the stopper 17 facing the band 13. The teeth 19 are formed in a sawtooth shape of an inverted right triangle in a side view, which is opposite to the teeth 14, and a horizontal upper surface 19a is meshed with a bottom surface 14b of the teeth 14 from below, whereby the second holding plate 12 has a toothed shape. Prevents upward movement.

When fixing the bone valve 1 to the bone window 3 in the skull bone valve fixing device 10 having such a structure, first, the second holding plate 12 is attached to the upper end portion of the band 13, The first holding plate 11 is inserted into the skull 2 from the bone window 3 so that one end in the longitudinal direction is brought into close contact with the lower surface of the peripheral edge of the bone window 3, and the band 13 is projected above the skull 2 along the wall surface of the bone window 3. Let Next, the bone flap 1 is fitted into the bone window 3, and the lower surface of the peripheral edge portion of the bone flap 1 is brought into close contact with the upper surface of the other end portion in the longitudinal direction of the first holding plate 11. After that, the second holding plate 12 is moved downward along the band 13, and the convex portion 15 is inserted into the gap G between the bone valve 1 and the bone window 3 so that both ends of the second holding plate 12 in the longitudinal direction. The lower surface is brought into close contact with the upper surfaces of the peripheral portions of the bone flap 1 and the bone window 3. When the second holding plate 12 is moved downward, that is, in the holding direction, the stopper 17 elastically deforms in the clockwise direction in FIG. 2 around the hinge portion 18 to release the meshing between the teeth 14 and 19. The holding plate 12 can be easily moved. When the second holding plate 12 is lowered to a predetermined position and brought into close contact with the bone flap 1 and the upper surface of the peripheral edge portion of the bone window 3, the bone flap 1 is divided into the first and second bone flaps.
It is held by the holding plates 11 and 12 and fixed to the bone window 3. Then, the upper end portion of the band 13 projecting from the band insertion hole 16 is cut with scissors or the like to complete the reduction work of the bone valve 1. In this case, a plurality of skull bone valve fixing devices 10, preferably three or more, are used to fix the bone valve 1.

Thus, in the skull bone valve fixing device 10 having such a structure, the first and second holding plates 11,
Since only the upper and lower peripheral surfaces of the bone valve 1 and the bone window 3 need to be clamped by 12, it is not necessary to drill a small hole with a bone drill or pass a steel wire, and the reduction work of the bone valve 1 can be performed quickly. The patient can be freed from the risk of dura, damage to the brain cortex, etc. due to drilling. Further, since the second holding plate 12 is completely prevented from moving in the anti-holding direction due to the meshing of the teeth 14 and 19, the second holding plate 12 does not loosen, and the convex portion 15 is formed between the bone flap 1 and the bone window 3. Since the bone valve 1 is inserted into the gap G to prevent the bone valve 1 from moving, the bone valve 1 can be stably and reliably fixed at a predetermined position. When moving the second holding plate 12 upward or removing it from the band 13, an appropriate tool is inserted from above between the teeth 14 and 19 to separate the stopper 17 from the band 13, and the teeth 14, 1
It suffices to release the meshed state of 9 and move the second holding plate 12 upward while maintaining this state.

FIG. 3 is a sectional view of the essential parts showing another embodiment of the present invention. In this embodiment, serrated teeth 14A and 14B are provided on both surfaces of the band 13, respectively, and the teeth 1 that mesh with the teeth 14A and 14B are provided inside the convex portion 15 of the second holding plate 12.
Two stoppers 17A and 17B having elastically deformable and habitual return characteristics in the meshing direction, which have 9A and 19B, respectively.
Is provided integrally. In such a structure, which possess the advantage of being able to block the movement of the anti-pinching direction of the 12 clamping plate 12 more reliably.

4 (a), (b) and (c) are a plan view, a perspective view and a sectional view showing still another embodiment of the present invention. This embodiment is applied to the case where the skull is thin, and the second holding plate 12 has a crescent-shaped cross section and is not provided with the convex portion 15 formed of the cylindrical body shown in FIGS. 1 and 3, and is provided in the center. A tongue-shaped stopper 17 is integrally extended on one side wall of the band insertion hole 16 in the longitudinal direction, and the notch 1 is formed on the upper surface of the tip end portion thereof.
7a is formed, and a plurality of teeth 19 are provided on the tip surface.
It is configured such that 19 is meshed with the teeth 14 of the band 13. The stopper 17 has a trapezoidal shape in plan view in which the width on the tip side is larger than that on the base side, and both side ends of the stopper 17 are stored and supported on the upper surface of the second holding plate 12 to prevent the stopper 17 from being deformed to the back side. The triangular recesses 23 are formed respectively. Reference numeral 24 is a device for releasing the meshed state of the teeth 14 and 19. Even with such a configuration, the same effect as that of the above embodiment can be obtained.

The present invention is not limited to the above-described embodiment, and various modifications and changes are possible. For example, the shapes of the teeth 14 and 19 can be changed, and the stopper 17 can be used as the second holding plate 2. The band insertion hole 1 is formed separately from
It may be movably incorporated in the unit 6.

[0015]

As described above, according to the apparatus for fixing a skull bone valve according to the present invention, since the two flaps are configured to clamp the upper and lower peripheral edge portions of the bone flap and the bone window, the bone drill. There is no need to drill a small hole or pass a steel wire with it, so there is little risk of dura and cerebral cortex injury, and bone valve reduction work can be performed quickly, and doctors and nurses involved in surgery It can significantly reduce the physical and mental burden of. Furthermore, since the second holding plate is completely prevented from moving in the anti-holding direction by the engagement of the teeth of the band and the stopper, the second holding plate does not loosen and can fix the bone valve in a stable and reliable manner. It is very large.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a skull bone valve fixing device according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a bone valve of the device is fixed.

FIG. 3 is a cross-sectional view of an essential part showing another embodiment of the present invention.

4 (a), (b) and (c) are a plan view, a perspective view and a sectional view showing still another embodiment of the present invention.

FIG. 5 is a diagram showing a conventional bone valve fixing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bone valve 2 Skull 3 Bone window 4 Steel wire 10 Cranial bone valve fixing device 11 1st holding plate 12 2nd holding plate 13 Band 14 teeth 15 Convex part 16 Band insertion hole 17 Stopper 18 Hinge part 19 Tooth

Claims (1)

[Claims] 1. A first and a second holding plate for sandwiching the upper and lower surfaces of the peripheral edge of the bone valve and the upper and lower surfaces of the peripheral edge of the bone window to fix the bone valve to the edge of the bone window, the first holding plate comprising: The second holding plate integrally has a band extending in the central portion of the upper surface and at least one surface of which is formed with a tooth, and the second holding plate is a band insertion hole through which the band is inserted, and the second engagement plate that meshes with the tooth. A skull bone valve fixing device comprising a stopper that prevents the holding plate from moving in the direction of coming out of the band.