JPH05237137A - Bar hole button for fixing cranial knochenschallappen - Google Patents

Abstract

PURPOSE:To accelerate the bone fusion to the cranial bone of the Knochenschlappen by surely fixing the Knochenschlappen to the craniotomy part after the craniotomy of the cranial bone. CONSTITUTION:The bar hole button 20 is formed of ceramics having excellent living body affinity and bone fusion property, such as, for example, calcium phosphate or apatite, and is formed to an approximately circular truncated cone shape which is formed to a large diameter in its top surface 20a and a small diameter in its base 20b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cranial valve fixing barhole used for fixing a cranial flap cut out at the time of craniotomy in the field of neurosurgery and repairing the craniotomy after the procedure. It's about buttons.

[0002]

2. Description of the Related Art Conventionally, when treating a brain tumor, an intracranial hematoma or the like in the area of neurosurgery, a cranial bone of a patient (Krunke) is cut off as a bone valve to form a craniotomy. There is a case where a surgical operation is performed on the cerebral tissue from the scalp, and in these cases and when the skull is opened in the treatment of a head injury or a fracture, as shown in FIG. 10, first, the scalp 1 is incised to remove the skull 2. It is exposed, and at a desired craniotomy position of the skull 2, as shown in FIG. 10 and FIG.
By forming an incision 3, and cutting between the perforations 3, 3, ... with a bone cutting wire saw or a clanitome (both not shown), the bone valve 4 at the desired position is excised and craniotomy. It is general to obtain the part 5, further incis the internal dura 6 and perform the operation on the brain tissue 7.

By the way, when the craniotomy 5 of the skull 2 is to be repaired after the operation on the brain tissue 7 is performed as described above, the craniotomy 5 is closed by the bone valve 4 and fixed. For this purpose, a bar hole cap is used, but as shown in FIG. 12, the conventional bar hole cap 10 is composed of a large diameter umbrella portion 10a and a small diameter shaft portion 10b.

When closing the craniotomy 5 after the operation, for example, the bone flap 4 shown in FIG. 10 is sewn to the craniotomy 5 at one location with a suture and wire, and in this state, the bone flap 4 is closed. And craniotomy 5
The shaft portion 10b of the bar hole cap 10 is inserted in the marks of the perforations 3, 3 ,.

In the case of closing the open head 5 as described above, the marks of the perforations 3, 3, ... In the vicinity of the sutured portion and the marks of the perforations 3, 3, .. Since the diameters of the perforations 3, 3, ... Are slightly different due to the relationship of the bone cutting groove 8 generated as shown in FIG. 10 at the time of cutting with the wire cutting wire saw or the like, the shaft portion of the bar hole cap 10 is 10b
Is smaller than the diameter of the perforations 3, 3, ... Generated at the time of craniotomy, while the diameter of the umbrella portion 10a of the bar hole cap 10 is generally larger than the diameter of the perforations 3, 3 ,. is there.

[0006]

However, in the conventional barhole cap 10 described above, the diameter of the shaft portion 10b is smaller than the diameter of the perforations 3, 3, ... Perforation that occurs when you head 3,
Only the effect of covering the marks of 3, ...
There is a problem in that it is difficult to fix the above to the craniotomy 5 and to obtain the action of promoting the bone fusion of the bone flap 4 to the skull 2.

The present invention has been made in view of the above circumstances, and can reliably fix the bone flap to the craniotomy after the craniotomy of the skull, and promote the fusion of the bone flap with the skull. An object of the present invention is to provide a barhole button for fixing a skull valve that can be used.

[0008]

To achieve the above object, the present invention is used for closing a perforation that occurs when a skull is opened, and is used for fixing a skull valve formed of a material having excellent biocompatibility. In the barhole button, the peripheral surface is formed in a tapered shape whose diameter increases from the bottom surface on the insertion side into the hole to the top surface facing the bottom surface.

In order to achieve the above object, the present invention provides
It was made of apatite or calcium phosphate.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing a schematic structure of a cranial valve fixing barhole button according to an embodiment of the present invention, and FIG. 2 is a craniotomy of a cranial bone using the cranial valve fixing barhole button of FIG. FIG. 3 is a plan view showing a state of being fixed to the portion, and FIG. 3 is a sectional view taken along the line EE in FIG.

As shown in FIG. 1, the barhole button 20 of this embodiment is made of, for example, calcium phosphate, apatite, or the like, which is ceramic having excellent biocompatibility and bone fusion property, and the top surface 20a thereof has a large diameter. Bottom 20b
It has the shape of a truncated cone with a small diameter.

Using this barhole button 20, FIG.
When the craniotomy 5 of the skull 2 as shown in FIG. 2 is closed with the bone flap 4 to restore the original skull shape, first the bone valve 4 is placed on the craniotomy 5 as shown in FIGS. Then, in this state, the bar hole button 20 is fitted from the bottom surface 20b side thereof into the marks of the perforations 3, 3, ... Formed between the bone flap 4 and the craniotomy 5.

After the bar hole buttons 20 have been fitted into the marks of all the perforations 3, 3, ... As described above, the bar hole buttons 20, 20, ... ... is further deeply fitted into the marks of the perforations 3, 3, ... And the space between the bone valve 4 and the craniotomy 5 is caulked by the barhole buttons 20, 20, ... As shown in FIG. The scalp 1 is sutured by filling the bone cutting groove 8 between the bone valve 4 and the craniotomy 5 with bone cutting (not shown) that occurs during cutting with the above-described wire cutting wire saw.

As a result, the bone valve 4 is firmly fixed to the craniotomy 5, and the barhole button 20 is formed of ceramics having excellent biocompatibility and bone fusion property. Bone fusion of the bone valve 4 to the craniotomy 5 via the barhole button 20 in the portion marked with 3, ..., and bone fusion of the bone valve 4 to the craniotomy 5 at the portion of the bone incision groove 8 are promoted. The repair period to the previous skull shape is shortened. Further, the protrusion amount of the barhole button 20 on the surface of the skull 2 can be suppressed to a small value, which is preferable in appearance.

Here, the fixed state of the barhole button 20 when the barhole button 20 is fitted into the perforation 3 formed by the clanitome is shown in FIG.
This will be described in detail with reference to (a) to (c). As shown in FIG. 4 (a), when a perforation 3 is formed at a desired position of the skull 2 using a clanitome 30 having two blades 30a and 30b having different diameters, the cross section of the perforation 3 has A step 3a as shown in FIG. 4B is generated depending on the difference in diameter between the two blades 30a and 30b.

Therefore, when the barhole button 20 is fitted into the perforation 3 having the step 3a, as shown in FIG. 4C, the peripheral surface portion of the top surface 20a of the barhole button 20, that is, the most. The large-diameter peripheral surface portion is crimped at the large-diameter portion 3b of the perforation 3, and the peripheral surface portion near the bottom surface 20b of the barhole button 20, that is, the peripheral surface portion having a relatively small diameter is in the perforation 3. The barhole button 20 is firmly fitted into the perforation 3 by being crimped at the small-diameter portion 3c, so that the bone valve 4 is firmly fixed to the open head 5.

By the way, in the step of fitting the barhole button 20 into the perforation 3 as described above, the barhole button 20 is formed in several perforations 3 as shown in FIG.
Is fitted, the interval of the bone incision groove 8 in that portion widens, which reduces the diameter of the perforation 3 in which the barhole button 20 is not fitted and the interval of the bone incision groove 8 in the perforation 3 portion. Then, it is assumed that the barhole button 20 cannot be fitted into the hole 3.
Therefore, in this case, as a supplement to the bar hole button 20 having a substantially truncated cone shape, a bar hole button 40 having a square pillar shape having a substantially square plane as shown in FIG. 6A may be used. Good.

The bar-hole button 4 having the shape of a square pole.
When 0 is used, the corner portion of the bar hole button 40 is appropriately cut as shown in FIG. The hole button 40 is fitted into the hole 3 as shown in FIG. As a result, the bone valve 4 can be fixed to the craniotomy 5 at the portion of the perforation 3 regardless of the diameter of the perforation 3. Further, when the perforation 3 is formed by the clanitome 30, the bottom surface of the bar hole button 40 whose corners are cut has a step 3 of the perforation 3 as shown in FIG. 6C.
Since the bar hole button 40 comes into contact with the portion a, it is possible to prevent the barhole button 40 from falling off the perforation 3 and entering the inside of the skull 2.

Two holes 41, 41 as shown in FIG. 7A may be formed in the barhole button 40 so that the tip of a tool such as tweezers can be inserted. According to this structure, as shown in FIG. 7B, the bar hole button 40 fitted in the hole 3 is formed.
Is rotated by tweezers 50 or the like, and the portion of the barhole button 40 having the longest diagonal length is fitted into the portion of the hole 3 having the smallest diameter so that the barhole button 40 can be fitted into the hole 3. It becomes possible to become stronger.

In this embodiment, the bar hole button 2 is used.
Although 0 is formed of ceramics such as calcium phosphate or apatite which has excellent biocompatibility or osteointegration, it may be composed of metal such as titanium, zirconium or alumina which has excellent biocompatibility. The barhole button 40 is preferably made of the same material as the barhole button 20.

FIGS. 8 and 9 show the schematic construction of a skull valve fixing barhole button according to another embodiment of the present invention. First, the barhole button 20 shown in FIG. A through hole 20c is formed in the center of the bottom surface 20b, and a bar-shaped button 20 shown in FIG. 9 is provided with a notch 20d having a substantially U-shaped plan.

As a result, after closing the craniotomy 5 of the skull 2 with the bone flap 4, the barhole button 2 shown in FIGS.
By inserting a catheter (not shown) through the through hole 20c and the cutout portion 20d of 0, for example, bleeding in the skull 2 can be sucked and discharged to the outside.

[0024]

As described above, according to the skull valve fixing barhole button of the present invention, the diameter is increased from the bottom surface, which is the insertion side into the perforation, to the top surface facing the bottom surface. Since it is configured to have a tapered shape,
The bone flap excised from the skull when the skull is opened can be firmly fixed to the craniotomy of the skull, and thus bone fusion of the bone flap to the craniotomy can be promoted.

As described above, according to the skull valve fixing barhole button of the present invention, since the skull valve fixing barhole button is made of apatite or calcium phosphate, the bone valve bar in the perforated portion is formed. Bone fusion to the skull via the hole button can be facilitated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a schematic configuration of a skull valve fixing barhole button according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which a bone valve is fixed to the craniotomy of the skull using the cranial valve fixing barhole button of FIG.

3 is a cross-sectional view taken along the line EE of FIG.

FIG. 4 shows the perforation formed by the clanitome.
FIG. 4 (a) is an explanatory view showing the work of forming a perforation by the craniotome, and FIG. 4 (b) shows the shape of the perforation by the craniotome. Explanatory drawing, FIG. 4 (c) is FIG.
It is explanatory drawing which shows the fixed state at the time of fitting the cranial valve fixing barhole button of FIG. 1 into the perforation shown to (b).

5 is a plan view showing a state in which the cranial flap fixing barhole button of FIG. 1 is fitted to a part of the perforations and the bone flap is opened.

6 is a quadrangular prismatic barhole button used as an auxiliary to the skull valve fixing barhole button of FIG. 1, and FIG. 6 (a) is an explanatory view showing its shape and usage. 6B and 6C are explanatory views showing a state in which the barhole button shown in FIG. 6A is fitted in the hole.

7A and 7B show modified examples of the barhole button shown in FIG. 6A, FIG. 7A being a perspective view thereof, and FIG. 7B being the use of the barhole button shown in FIG. 7A. It is explanatory drawing which shows a method.

FIG. 8 is an explanatory view showing a schematic configuration of a skull valve fixing barhole button according to another embodiment of the present invention.

FIG. 9 is an explanatory view showing a schematic configuration of a skull valve fixing barhole button according to another embodiment of the present invention.

FIG. 10 is an explanatory diagram illustrating a general craniotomy procedure for a skull.

FIG. 11 is a cross-sectional view taken along the line Loro of FIG.

FIG. 12 is an explanatory diagram showing a schematic configuration of a conventional barhole cap.

[Explanation of symbols]

 2 Skull 3 Perforation 4 Bone flap (cranial flap) 5 Craniotomy 20 Barhole button 20a Top 20b Bottom

Claims (2)

[Claims] 1. A cranial valve-fixing barhole button, which is used for closing a perforation that occurs when a skull is opened and is formed of a material having excellent biocompatibility, the peripheral surface of which is inserted into the perforation. A skull-valve-fixing barhole button, characterized in that it is formed in a tapered shape whose diameter increases from the bottom surface that becomes the side to the top surface that faces the bottom surface. 2. The burrhole button for fixing the skull valve according to claim 1, which is formed of apatite or calcium phosphate.