JPS58177646A - Molding tool for molding filler material of deficient scalp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaping tool that is capable of molding in a short time a defective skull replacement material with adjustable thickness and shape and an extremely good quality.

Conventionally, in cranioplasty, filling materials used for skull defects are roughly classified into three types: bone materials, metal materials, and synthetic resins. Although bone materials have the advantage of having a high possibility of physiological union occurring once they heal,
Disadvantages include that if melting occurs after plastic surgery, reoperation using an artificial bone is required, and preservation and disinfection are difficult.

In addition, metal materials have no X-ray transparency, high thermal conductivity, and no flexibility against secondary trauma.
They have drawbacks such as being difficult to process and mold, easily damaging surrounding soft tissue after formation, and depending on the material, they are extremely expensive. On the other hand, with advances in technology related to synthetic resins, filler materials made of synthetic resins have recently come into wide use. In this case, a fast-curing synthetic resin is used, and after a short period of time,
It can be molded into any shape, and has the ideal conditions that a prosthetic material should have: low biological tissue reaction, ease of production, sterilization, surgical operation, acquisition and storage, etc. It is considered an excellent supplementary material because it satisfies many conditions such as having appropriate hardness and specific gravity to protect the contents, causing little discomfort, and not interfering with various tests using X-rays or electromagnetic waves. It is considered.

Here, the cranial formation method using fast-curing resin involves filling the cranial defect with wet cotton or gauze to form a surface that matches the normal curved surface of the skull, and then placing a sterilized polyethylene film on top of it, or There are two methods: placing a polyethylene film directly on the cranial defect and then pouring liquid resin onto it and letting it harden.Alternatively, a plaster mold is made using an autologous bone fragment as a model, and liquid resin is poured into it and hardened. There are two types of methods; the former method involves pouring resin onto a polyethylene film placed on the brain tissue and curing it, although there are some differences between direct and indirect methods. Because of this, there is a high possibility that various stimuli may be given to the brain tissue, and at the same time,
It is not easy to adjust the thickness of the resulting artificial bone to the desired thickness.On the other hand, the latter method using a plaster mold is extremely complicated and time-consuming, and the autologous bone fragments often break or melt. This cannot be used as a prototype, making it impossible to prepare a template.

This invention was made in view of the current situation, and is made of a rubber material in which a flexible core material is enclosed in the length direction, and has vertical sides and horizontal sides. A defect characterized in that at least one end face forms a plane that is at an acute angle with respect to the inner surface of the longitudinal side and perpendicular to the inner surface of the horizontal side. The present invention provides a shaping tool for cranial prosthesis material, and the details thereof will be described below using the drawings.

First, the molding tool for molding the defective skull replacement material of this invention (
An example of A (hereinafter abbreviated as a shaping tool) is shown in FIG.

In other words, the shaping tool A is made of angle iron or a similar shape having 1 vertical side and 2 horizontal sides. Here, angle steel is a type of steel section that is widely used as a building material, and is also called L section steel because of its cross-sectional shape. They are classified as having the same length (length) or scalene, that is, having unequal widths on both sides.

However, if the cross-sectional shape of the shaping tool A of the present invention is such that the angle formed by the inner surface 3 of the vertical side and the inner surface 4 of the horizontal side is a right angle or an angle close to the right angle, the shaper A according to the Japanese Industrial Standards
It is not restricted by the relative relationship between the widths of both sides of the angle iron as stipulated in standards such as IS);
,(B).

(c) +-(=) and (e) may have cross-sections as exemplified. The reason why the angle between the inner surface 3 of the vertical side and the inner surface 4 of the horizontal side is a right angle or an angle close to it is that this part is stabilized at the periphery of the skull defect as shown in Figure 2. This is because it is convenient for making them come into close contact with each other.

Next, at least one end surface 5 of the shaping tool A of the present invention is at an acute angle with respect to the inner surface 3 of the vertical side and perpendicular to the inner surface 4 of the horizontal side. The reason why the end surface 5 is made at an acute angle with respect to the inner surface 3 of the vertical side is that, as shown in FIG.
(the outer surface 6 of the vertical side becomes the inner side of the ring), this is to make the connection of the outer surface 6 of the vertical side at the contact point as smooth as possible. It should be noted that when considering only the smoothness of the inner circumferential surface when forming a ring shape, it is natural that the smaller the angle is, the more preferable the acute angle is. In this case, there is a risk of accidentally harming the brain tissue, etc., so the temperature should be set at 30 to 60 degrees.
It is recommended that the edges be appropriately rounded.

Further, the material of the shaping tool A in this invention is a substance having rubber elasticity, and may be natural rubber, synthetic rubber, or synthetic resin. Of course, it must be hygienic and do not cause any harm or contain harmful additives.

Regardless of whether it is disposable or not, it is necessary to withstand disinfection when used repeatedly, so silicone resin, for example, can be said to be one of the preferred materials.

The flexible core material 7 enclosed in such a rubber material is
The shaping tool A of the present invention can be easily bent and extended, and is intended to maintain the change in posture caused by the bending and extension, and is not conventionally used in a flexible ruler or the like. It is based on the same principle as
In view of the intended use of the present invention, it is of course preferable that the material of the core material 7 be harmless to the human body like the rubber material described above, such as gold wire, silver wire, tempered iron wire, or aluminum wire. For example, when copper, lead, or their alloys are used, surface treatment must be applied to prevent these toxic metal ions from leaching out, or the metal must be completely encapsulated with a rubber material. Consideration should be given to this. Here, the method for encapsulating the core material 7 in the rubber material is as follows:
Either a cavity is formed in the length direction of the rubber material in advance, and the core material 7 is inserted into the cavity and both ends of the cavity are sealed, or the core material 7 is exposed on the outside when the rubber material is molded into a predetermined shape. Moreover, the shape of the core material 7 may be either a square bar or a round bar without interfering with the effects of the present invention.

The shaping tool A of the present invention cuts the defect while bringing the inner surface 3 of the vertical side and the inner surface 4 of the structure into close contact with the periphery of the defect of the skull B as shown in FIG. Since the shape is to be taken, it is desirable that the length of the vertical side 1 and the width of the inner surface 3 of the vertical side be less than or equal to the thickness of the skull B. This is because if the length of the vertical side 1 is too long, it will compress the brain tissue, which is undesirable. On the other hand, the length of the lateral side 2 and the width of the inner surface 4 of the lateral side need only be long enough to be hooked onto the surface of the skull. The thickness of the vertical side 1 is determined by the finished artificial bone fragment (
It is preferable to fit the cranial defect) without any gaps, or in fact, there is no problem even if there are some gaps, so that the inner surface 3 of the vertical side gets caught on the periphery of the skull, and when making the shape, use the shaping tool A.
In order to avoid sushi that is out of character or crooked, 2~
It may be about 31. Furthermore, the inside surface 3 of the vertical side and the outside surface 6 of the vertical side are parallel to each other, but the inside surface 4 of the horizontal side and the outside surface 8 of the horizontal side are shown in FIGS. 1 and 2. They may be parallel to each other as shown in FIG. , the two do not need to be in a parallel relationship.

Although it is necessary to control the overall dimensions in various ways depending on whether the child is an adult or a child or where the defect is, as a rough guide, the width of the outer side 6 of the vertical side and the outer side 8 of the horizontal side should be 3 to 3 mm. about 10 nM'n, and the total length is 4 Q cm
If the thickness is set at a certain level, it is possible to ensure adhesion to the periphery of the defective part, reliability of the cutting operation, etc.

When using the shaping tool A of the present invention for cranioplasty, first, the curved surface of the cranial bone defect part is formed using a wire mesh C while making appropriate irregularities with the fingertips, judging from the surrounding shape. The wire mesh C is not particularly limited, but it is convenient to use stainless steel equivalent to Japanese Pharmacopoeia No. 2 or No. 4 (IIFIi opening of about 1 to 3 mm).

As shown in Figure 4, a wire mesh replicating the surface of the skull defect is placed so that it is concave, and a sterilized polyethylene film (not shown in Figure 4) is placed on top of it. On top of that, place the ring-shaped cutting tool A that has finished cutting.
Reverse the polyethylene film on the wire mesh C so that the outer surface 8 of the lateral side is in contact with the polyethylene film on the wire mesh C, and place it on the opposite part of the periphery of the defect. ~
Fix in 4 places. In order to accurately grasp the shape of the shaping tool A from the time of making the shape of the skull defect to the time of fixing it on the wire mesh (the total length of the periphery of the skull defect),
If a scale indicating the length is provided on either or both of the outer surface 6 of the vertical side or the outer surface 8 of the horizontal side, even if the end of the shaping tool A moves slightly during operation, , it may be possible to restore it to the correct position immediately.

After the wire mesh C and the shaping tool A are fixed, the resin liquid is introduced. For example, the resin liquid is manufactured by Codm Co., Ltd.
It is a methacrylic fast-curing resin called Cranio Plastic Kit manufactured by An), and after injecting this resin, it will last about 15 minutes.
The resin layer will harden after a few minutes, so the thickness of the resin layer should be adjusted according to the original bone thickness until the assimilation is completed. (to strengthen the fixation of the filling material due to the invasion of granulation tissue). In addition, in order to adjust the thickness of the injected resin layer, it is extremely easy to adjust the thickness by placing a mark indicating the height on the outer surface 6 of the vertical side in the height direction of the vertical side. It is.

This mark may be one or more parallel lines drawn in the longitudinal direction, or may be made to be distinguishable as a laminate of different colored materials during molding of the rubber material.

Once the injected resin has solidified, the molding of the filler material is complete, and the shaping tool A and the wire mesh C can be removed. In addition, if the shaping tool of this invention is fixed on the upwardly curved wire mesh surface and the resin liquid is poured in and solidified and molded,
The cross section of the resulting resin molded product is usually trapezoidal (trapezoidal),
This has the advantage of helping to prevent it from falling into the skull after surgery. Therefore, according to the present invention, it is possible to complete the molding of a well-made defective skull replacement material during cranioplasty surgery, which cannot be easily achieved with conventional methods. Therefore, it can be said that the significance is extremely large.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a perspective view showing an example of the molding tool for forming the defective cranial prosthesis material of the present invention, and Fig. 2 shows the molding tool shown in Fig. 1 tightly fixed to the cranial defect. FIGS. 3(a) to 3(e) are sectional views illustrating a shape similar to the angle iron of the present invention, and FIG. 4 is a perspective view showing a partial cross section when It is a perspective view for explaining the method of shaping|molding a supplementary material using the shaping tool shown. 1...Vertical side, 2...Horizontal side, 3...Inner side of vertical side,
4...Inner surface of horizontal side, 5... End surface, 6... Outer surface of vertical side, 7... Core material, 8... Outer surface of horizontal side, A...
・Molding curtain for forming defective skull replacement material, B...Skull, C...Wire mesh Patent applicant Nobutoshi Funatsu Agent Kama 1) Text 2 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) It is made of a rubber material in which a bendable and extensible core material is enclosed in the length direction, and has a shape of angle iron or similar shape having vertical sides and horizontal sides, and at least one end surface thereof is
1. A shaping tool for forming a cranial bone prosthesis material, characterized by forming a plane that is at an acute angle with respect to the inner surface of the vertical side and perpendicular to the inner surface of the horizontal side. (2) The defective skull replacement material molding according to claim 1, wherein at least one of the outer surface of the vertical side and the outer surface of the horizontal side is a surface having a scale indicating the length in the length direction. Shaping tool. (3) The shape for molding a defective skull replacement material according to claim 1 or 2, wherein the outer surface of the vertical side is a surface with a mark indicating the height in the height direction of the vertical side. handle.