JP2002045367A - Fixing implement for bone flad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device for a bone flap not having protruded part to the inside of a skull and allowing easily performing operation. SOLUTION: An axis 4 that is possible to be inserted between opposite sides 102T and 101T of a skull 102 and a bone flap 101 is placed on a lower face 3 of the front side of a head 2. Stoppers 5, 5 are placed as in protruded manner as the axis 4 that is possible to get into a cancellous bone 105 between cortical bones 103 and 104 existing on the front back side of the skull 102 and the bone flap 101. By use of an opening S made while the skull 102 around an affected part is removed, the axis 4 is inserted into the opening S between the opposite sides 102T and 101T of the skull 102 and the bone flap 101, and by rotating the axis 4 by use of the head 2, the stoppers 5, 5 get into the cancellous bone 105 under the cortical bone 103 existing on the front side to fix the bone flap 101 to the skull 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone flap fixing device for fixing a bone flap or the like removed during a surgical operation to a skull.

[0002]

In a craniotomy operation such as a neurosurgery operation or a plastic surgery operation, a part of a skull is cut and removed, and the removed bone flap is returned to an opening to be fixed or an external factor. As a means to fix the bone flap depressed by, there is a fixture consisting of a plate and a screw,
The use of this fixture allows firm fixation and removal after surgery, but the installation process is troublesome, so the operation time is lengthened and the time required to expose the affected part to the outside air is lengthened. There is. Therefore, Japanese Patent Application Laid-Open No. 9-206311 discloses an apparatus for fixing a surgical skull comprising a metal or metal compound pin and two discs to the original skull after the operation, The disc has a device in which teeth are opposed to each other and attached to the pin shaft to fasten a skull and a skull (claims). In this device, one inner disc is provided via a concave notch. With the shaft protruding from the kerf (the skull between the skulls), slide the plug inside the kerf to a predetermined position (bone flap) and along the inner surface of the skull (Japanese Patent Publication No. 0023). The disk is attached to the shaft on a pin, and this outer disk is finally fixed to the shaft using a tool of the type used to tighten the rivets, and the outer disk is toothed together with the inner disk. Press until it digs into plug and skull tissue Secured both, which cutting the portion of each shaft extending outwardly from the outside of the disk (Publication No. 0 024 stages), it is possible to shorten the operation time as compared with the former person.

[0003] However, in the device using the above-mentioned disk, it cannot be removed after the installation, and it is difficult to cope with a case where reoperation is necessary. Also, to insert a disk,
A recess must be formed between the skull and the bone flap into which the disc can be inserted. Furthermore, the disc may protrude from the inside of the skull after the operation, and may come into contact with the brain. This is also a concern.

[0004] Therefore, an object of the present invention is to provide a bone flap fixture which does not have a portion protruding inside the skull and can easily perform an operation.

[0005]

According to a first aspect of the present invention, there is provided a bone valve fixing device for fixing a bone flap to a skull in a surgical operation, wherein a shaft portion insertable between opposing surfaces of the skull and the bone flap. And a locking portion protruding from the shaft portion between the cortical bones on the front and back of the skull and the bone flap.

[0006] According to the first aspect of the present invention, by utilizing the gap formed when the skull around the affected area is resected, the shank is inserted into the gap between the opposing surfaces of the skull and the bone flap. The rotation allows the locking portion to penetrate into the marine bone below the cortical bone on the front side to fix the bone flap to the skull. And since it does not protrude inside the skull, there is no possibility that the fixing tool will come into contact with the brain. Also, in the case of a re-operation, the head can be removed by turning the head in reverse.

[0007] In the invention of claim 2, the locking portion is formed so that the distal end side is thinner than the base end side.

According to the second aspect of the present invention, when the shaft is rotated using the head, the locking portion can smoothly enter the sea bone from its thin tip side.

Further, in the invention according to claim 3, the locking portion includes:
One side is formed sharper than the other side.

According to the third aspect of the present invention, if the locking portion is operated so as to rotate to one side, the sharp side can be smoothly rotated so as to be inserted into the marine bone. In contrast, rotation on the other side in the opposite direction increases resistance, and after installation, it does not move with mere contact, etc.
A stable mounting state is obtained.

Further, in the invention according to claim 4, the locking portion is provided side by side in the longitudinal direction of the shaft portion.

According to the fourth aspect of the present invention, a good attachment strength can be obtained by the plurality of locking portions penetrating into the sea bone.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show the first embodiment of the present invention.
As shown in the examples, the fixing device 1 of the present invention is used for fixing the bone flap 101 removed in the surgical operation to the skull 102 as described in the section of the problem to be solved by the above-mentioned invention. Bone flap 101 and skull 102 are front and back cortical bone 10
There is a marine bone 105 between 3,104. As shown in the figure, a fixture 1 made of titanium or the like having excellent biocompatibility has a head 2 made of a thin plate-like flat plate. The shaft portion 4 is protruded from the sea surface bone 10
5, which are provided at the lower end of the shaft 4 so as to protrude on both sides in a direction perpendicular to the shaft 4. The lower surfaces 5K of the portions 5, 5 are formed as flat surfaces substantially parallel to the lower surface 3. The width H of the shaft portion 4 having the locking portions 5 is determined by the gap S between the opposing surfaces 101T and 102T of the bone flap 101 and the skull 102.
Is set to be insertable into When the width of the locking portion 5 is larger than the diameter of the shaft portion 4, the width of the locking portion 5 is the width H. Further, the head 2 is wider than the gap S. As shown in FIG. 1, the locking portion 5 is formed so that the tip 5S side is sharper and thinner than the base end side, and one side surface 6 side in the rotation direction around the shaft portion 4 is formed sharply on the other side surface 7 side. As shown in the end view of FIG. 2, in this example where the lower surface 5K is horizontal, the angle θ6 formed by the lower surface 5K and one side surface 6 is formed smaller than the angle θ7 formed by the lower surface 5K and the other side surface 7. By setting the lower surface 5K in the horizontal direction, when the one side surface 6 is rotated in the direction of one side of the arrow Y, a downward biting force is obtained. Further, in this example, by making the periphery 2S of the head 2 a hexagonal polygonal shape, the periphery 2S is used as a tool engaging portion to facilitate the rotation operation. Furthermore, the tip 5S of the locking portion 5 faces the corner of the periphery 2S,
A corner of the periphery 2S is a mark indicating the direction of the locking portion 5.

The opposing surface 10 of the bone flap 101 and the skull 102
When the shaft portion 4 is inserted into the gap S of, for example, about 2 mm between 1T and 102T, and the fixture 1 is rotated in one side direction Y using the head portion 2 around the shaft portion 4, the locking portions 5, 5 The thin tip 5S side enters the marine bone 105 and is rotated by approximately 90 degrees, so that the locking portion 5 is located below the cortical bone 103 in the front, and the bone flap 101 and the skull 102 are fixed as shown in FIG. And head 2
Is on the front side of the cortical bone 103, the frontal cortical bone 103 is sandwiched between the head 2 and the locking portion 5, and a predetermined portion is fixed by the fixture 1 as shown in FIG. Note that the locking portion 5 may partially penetrate the cortical bone 103, and in this case, the locking portion 5 is also a bone flap.
It is not exposed inside and outside 101 and skull 102. Also, when rotating the fixture 1, the sharp side 6 of the locking portion 5 can smoothly bite into the sea surface bone 105 and rotate with relatively little resistance, while the resistance in the opposite direction can be increased. Becomes larger. When it is necessary to remove the bone flap 101 again, the shaft 4 can be pulled out of the gap S by turning the fixing tool 1 by 90 degrees and aligning the locking portions 5 and 5 with the gap S.

As described above, according to the present embodiment, in the bone flap fixing device for fixing the bone flap 101 removed in the surgical operation to the skull 102, the lower surface 3 of the head 2 on the front side corresponds to the first aspect. And a shaft 4 that can be inserted between the opposing surfaces 102T and 101T of the skull 102 and the bone flap 101.
Since the skull 102 and the locking portions 5 and 5 that can enter the sea surface bone 105 between the cortical bones 103 and 104 on the front and back of the bone flap 101 protrude, a gap formed when the skull 102 around the affected area is resected. S, the opposing surface 102 between the skull 102 and the bone flap 101
By inserting the shaft portion 4 into the gap S between T and 101T and rotating the shaft portion 4 using the head portion 2, the locking portions 5 and 5 enter the marine bone 105 below the cortical bone 103 on the front side. Thus, the bone flap 101 can be fixed to the skull 102. And since it does not protrude inside the skull 102, there is no possibility that the fixing device 1 will come into contact with the brain. Further, in the case of a re-operation or the like, the head 2 can be removed by turning the head 2 in reverse. Further, since the shaft portion 4 can be inserted into the gap S formed when the skull 102 near the affected part is resected, it is not necessary to form a relatively large concave portion as in the related art.

Further, as described above, in this embodiment, claim 2
In response to this, the locking portion 5 is formed so that the tip 5S side is thinner than the base end side. Therefore, when the shaft portion 4 is rotated using the head 2, the locking portion 5 is moved from the thin tip 5S side to the sea surface bone. You can get into the 105 smoothly.

As described above, in the present embodiment, claim 3
In response to this, the locking portion 5 is formed so that the one side surface 6 side is sharper than the other side surface 7 side, so that the one side surface 6 side of the locking portion 5 is on a sharp single blade, and the locking portion 5 is one side surface. If it is operated to rotate to the 6 side, the one side 6 side that is sharp and easy to bite is smoothly inserted into the sea bone 105, while the rotation on the other side 6 side in the opposite direction increases resistance, and ,
It does not move by mere contact, and a stable mounting state can be obtained.

Further, as an effect of the embodiment, since the head 2 has the periphery 2S serving as a tool engagement portion, the rotating operation of the fixture 1 can be easily performed. Further, since the periphery 2S is a mark indicating the direction of the locking portion 5, it is easy to confirm the fixed position rotated by approximately 90 degrees after insertion.

FIGS. 7 and 8 show a second embodiment of the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Part 2
Form a minus groove 11 as a tool engagement part on the upper surface of
The locking portions 5, 5 face in the direction of the groove 11. Therefore, by engaging a tool like a flathead screwdriver with this groove 11, the rotation operation of the fixture 1 can be easily performed. In the locking portion 5 of this example, the inclined upper surface 5J, the one side surface 6 side and the other side surface 7 side are formed symmetrically with respect to the length direction thereof, and the one side surface 6 side and the other side surface 7 side are formed symmetrically. Both can be rotated.

As described above, also in this embodiment, claim 1
According to the above-described embodiments, the same operation and effect as those of the above-described embodiment are obtained. In this example, the locking portion 5 is symmetrical on one side surface 6 side and the other side surface 7 side with respect to the longitudinal direction. Since it is formed, the fixture 1 can be rotated in both directions. In addition, since the direction of the locking portion 5 can be known by the groove 11, the fixing tool 1 may be turned to a position where the groove 11 intersects the gap S at the time of fixing, and the groove 11 is a mark indicating the direction of the locking portion 5. Is also used.

FIGS. 9 and 10 show a third embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. The part 2 has a dish shape, and the inclined surface 2 whose upper surface becomes lower toward the periphery 2S.
K. Further, the shaft portion 4 has a lower end locking portion 5.
At the same time, a locking portion 5 ′ is provided above the locking portion 5, and the locking portions 5, 5 ′ are projected in the same direction.
It is smaller. In this example, the cross-sectional shape of the shaft portion 4 is not circular, but has a substantially elliptical shape that is long in the projecting direction of the locking portion.

Therefore, the locking portions 5, 5, 5 ', 5' which can enter the marine bone 105 between the cortical bones 103, 104 on the front and back of the skull 102 and the bone flap 101 are protrudingly provided. According to the first and second aspects, the same operations and effects as those of the above-described embodiments are obtained. In this embodiment, the locking portions 5, 5 'are formed by the shaft portions according to the fourth aspect. Since the plurality of locking portions 5 and 5 ′ are provided side by side in the length direction of the seam 4, a good attachment strength can be obtained when the plurality of locking portions 5 and 5 ′ enter the sea bone 105.

FIGS. 11 and 12 show a fourth embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. 12
As shown in the end view of FIG. 5, the inclination of one side surface 6 and the other side surface 7 is the same, and the crossing leading edge of the other side surface 7 and the lower surface 5K is chamfered.
By setting to 12, the one side surface 6 side is formed more sharply than the other side surface 7 side, and the one side surface 6 side may have a shape that has less rotational resistance than the other side surface 6 side and is easy to bite.

FIGS. 13 and 14 show a fifth embodiment of the present invention. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. 1 does not have a head, but is provided with an operating portion 4A extending from the upper portion of the shaft portion 4 and having the same cross section as the shaft portion 4 and having an axial shape. 4 and the bone flap 101
In a state in which the locking portions 5 and 5 are inserted into the gap S between the opposing surfaces 101T and 102T of the skull 102, the protrusions protrude outside the cortical bone 103 on the front side, and the operating portion 4A is pinched by a clipping tool or the like so that the shaft 4 Can be rotated to lock the locking portion 5 to the lower part of the front cortical bone 103 as in the above-described embodiment. Thereafter, the operating portion 4A protruding outside from the front cortical bone 103 is cut by a cutting tool (not shown), and as shown in FIG. 4A is cut. Further, if the operation portion 4A protruding from the outer cortical bone 103 to the outside is formed relatively short, the operation portion 4A may be used as it is without cutting. 13 and FIG.
4 corresponds to FIGS. 1 and 5 described above.

As described above, according to the present embodiment, in the bone valve fixing device for fixing the bone flap 101 removed in the surgical operation to the skull 102, the skull 102 and the bone flap 1
A shaft 4 that can be inserted between the surfaces 102T and 101T facing the first 01 is provided, and the skull 102 and the bone flap 101
Since the locking portions 5 and 5 which can enter the sea surface bone 105 between the cortical bones 103 and 104 on the front and back are protruded, the same operation as in the first embodiment according to claims 1 to 3 is provided.・ Effective.
Further, in this example, since no head is provided, the material cost can be reduced, and a relatively inexpensive fixture can be obtained.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, the skull in the present invention includes the skull and the bone forming the face. Further, the locking portion may have the same width on the base end side and the front end side, or may have a wide front end side. In this case, it is sufficient that the width is such that the maximum width of the front end can be inserted into the gap. Furthermore, the upper surface of the locking portion may be horizontal and may be inclined with the lower surface. Also, the fixtures of the second to fourth embodiments can be used in the same manner as the fifth embodiment by providing an operation section having an extended shaft without providing a head. Further, the shaft portion and the operation portion are not limited to a circular cross section, but may be a polygonal cross section. If the operation portion having the same shape as the shaft portion is formed in a polygonal shape, handling with a clipping tool or the like becomes easy.

[0027]

According to a first aspect of the present invention, there is provided a bone valve fixing device for fixing a bone valve to a skull in a surgical operation, wherein a shaft portion which can be inserted between opposing surfaces of the skull and the bone valve is provided. The shaft portion has a locking portion protruding between the cortical bones on the front and back of the skull and the bone flap, and provides a bone flap fastener that can easily perform an operation. Can be aimed at.

A second object of the present invention is to provide a bone flap fixing device in which the distal end side of the locking portion is formed thinner than the proximal end side, so that the operation can be easily performed. It can be.

The invention according to claim 3 is characterized in that the locking portion is
One side surface is formed sharper than the other side surface, and an object of the present invention is to provide a bone flap fastener that can easily perform an operation.

According to a fourth aspect of the present invention, the locking portion is provided side by side in the longitudinal direction of the shaft portion.
An object of the present invention is to provide a bone flap fixture that does not have a portion protruding inside a skull and can easily perform an operation.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is an enlarged end view taken on line AA of FIG. 1 showing the first embodiment of the present invention.

FIG. 3 is a front view showing the first embodiment of the present invention.

FIG. 4 is a bottom view showing the first embodiment of the present invention.

FIG. 5 is a sectional view of a use state showing the first embodiment of the present invention.

FIG. 6 is a perspective view of a use state showing the first embodiment of the present invention.

FIG. 7 is a side view showing a second embodiment of the present invention.

FIG. 8 is a front view showing a second embodiment of the present invention.

FIG. 9 is a side view showing a third embodiment of the present invention.

FIG. 10 is a front view showing a third embodiment of the present invention.

FIG. 11 is a side view showing a fourth embodiment of the present invention.

FIG. 12 is an enlarged end view taken on line AA of FIG. 11 showing a fourth embodiment of the present invention.

FIG. 13 is a side view showing a fifth embodiment of the present invention.

FIG. 14 is a sectional view of a use state showing a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixture 2 Head 4 Shaft 5 Locking part 5S Tip 6 One side 7 Other side 101 Bone flap 101T Opposite surface 102 Skull 102T Opposite surface 103 Cortical bone in front 104 Cortical bone in the back 105 Sea bone S Gap

Claims (4)

[Claims] 1. A bone valve fixing device for fixing a bone flap to a skull in a surgical operation, wherein a shaft that can be inserted between opposing surfaces of the skull and the bone flap is provided. What is claimed is: 1. A bone flap fastener comprising a skull and a locking portion protruding between cortical bones on both sides of a bone flap. 2. The bone flap fastener according to claim 1, wherein the locking portion has a distal end formed to be thinner than a proximal end. 3. The bone flap fastener according to claim 1, wherein one side of the locking portion is formed more sharply than the other side. 4. The bone flap fastener according to claim 1, wherein the locking portions are provided side by side in a longitudinal direction of the shaft portion.