JPS6335383B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for grinding ultrafine materials for use in needle-like medical devices such as dental reamers, files, and surgical suture needles having polygonal cross-sections. It is something.

<Conventional technology> Conventionally, when grinding this type of needle-like medical device,
(A) A method in which the ultra-fine material used as the material for medical devices is held by hand and the tip is ground into a pyramid using a rotating grindstone, etc.
(B) A method in which the base of the ultra-fine material is held between a chuck with a triangular external shape and the tip of the ultra-fine material is ground with a whetstone while using a profiling rod, etc. (C) A chuck attached to an indexing machine A method of holding one piece of material and grinding the tip with the side surface of a grindstone while determining the angle, (D) Patent application filed by the applicant for this patent in 1982-
As shown in No. 17632, a method in which edges are formed in two places by gripping a large number of ultra-fine materials in parallel with chucks and grinding them from only one direction, or (E), or a method according to the patent application filed by the present applicant. As disclosed in Publication No. 57-43386 and Japanese Patent Application Laid-Open No. 57-144651, a round bar-shaped ultra-fine material is gripped in parallel with a chuck consisting of two upper and lower plates, and the ultra-fine material is held in a constant position by mutually shifting the upper and lower plates. A method has been developed and put into practical use in which the tip of an ultra-fine material is ground into a polygonal cross-section by rotating at an angle and grinding each time.

<Problems to be solved by the invention> However, in the cases of prior art (A), (B), and (C) mentioned above, most of them are manual methods, which are inefficient and cannot be mass-produced, and the workers are not skilled. For example, even if it is mechanized, it takes a long time to process one piece at a time, or it is not possible to mass-produce at a low cost. Since only a chisel is ground, there is a drawback that it is not possible to form ultra-fine materials with three or more edges.In addition, in the case of (E), the rotation depends on the amount of misalignment between the upper and lower plates of the chuck. Because the angle varies, the amount of displacement must always be constant, making it difficult to achieve uniformity.Furthermore, even if the displacement accuracy is high, the amount of displacement is completely inconsistent due to the contact relationship between the ultra-fine material and the chuck. Since the chuck may exhibit a large rotation angle, it requires skill to carefully examine the material condition of the chuck surface, and if the outer diameter of the base of the ultra-fine material is not uniform, the chuck may rotate only a small amount even if the chuck is shifted. Therefore, it is not possible to uniformly grind all the tips of a large number of extremely fine materials held by the chuck, resulting in a large number of defective products.

<Means for Solving the Problems> The method of grinding a needle-like medical device according to the present invention is a completely new technique developed in view of these conventional drawbacks, and is particularly applicable to dental reamers, files, and surgical tools. An angular cross-section similar to the angular cross-section formed at the tip of this ultra-fine material is pre-press-formed on the base of the ultra-fine material that is the raw material for medical devices such as suture needles, and a large number of these ultra-fine materials are made. By gripping the press molded part in parallel with two upper and lower chucks, and shifting the chucks along the axis of the ultra-fine materials, a large number of the ultra-fine materials are aligned and rolled at the same time, and the tip of the ultra-fine materials is placed on a grindstone, etc. The present invention relates to a completely new technique characterized in that edges and cutting edges are formed by grinding into a predetermined rectangular cross section.

<Function> As described above, in the method according to the present invention, since the base part of the ultra-fine material is previously formed into an angular cross section having a similar shape to the angular cross section formed at the tip thereof, the chuck The upper and lower plates can reliably grip the press-formed parts of a large number of ultra-fine materials arranged in a row, and by shifting the upper and lower plates of the chuck, the ultra-fine materials can be rotated evenly and accurately. The tip of the ultra-fine material can be machined with extremely high precision.

<Example> To specifically explain an example of the method according to the present invention using figures, in FIG. 1 A, B, C, and D,
Reference numerals 1, 2, 3, and 4 are various ultrafine materials used as materials for dental or surgical needle-like medical instruments, and each of these materials has a material formed at the tip thereof. A corner cross section having exactly the same directionality and a similar shape to the shape of the square cross section to be used is previously formed by press working. In addition, these base parts a may be cut out and used as a product, or may be used as a part of the product as they are. For example, for material 1, tip part b
By forming a plastic handle (indicated by dotted lines) on the outer periphery of the twisted rear part a by insert molding etc., it is used to increase the rotational force of the needle within the handle. A hole is made from the base of the flat part, and the entire proximal side of the hole is cut out, and the entire length is made into an arc shape to form a surgical eye needle. To,
Further, blank holes are machined in the axial direction on the base end face of the raw material 4, and the entire length is made into an arc shape to form an eyeless needle for surgery.

Next, in FIGS. 2 and 3 A, B, and C, reference numeral 5 is a wide chuck consisting of an upper plate 6 and a lower plate 7, and the upper plate 6 and lower plate 7 of this chuck 5 have, for example, A large number of base parts a of the ultra-thin rods 4 are held in parallel.

Therefore, the ultra-thin rod 4 held by the chuck 5
When grinding the tip of the chuck 5, grind it to a predetermined size by contacting the rotating grindstone 8, and then grind the top plate 6 and bottom plate 7 of the chuck 5 in the direction of the arrow as shown in FIGS. 3A to 3C. The base part a of the ultra-thin rod 4, which is shifted and held by these upper and lower plates 6 and 7, is rolled and rotated, and the surface of the tip part b, which is indicated by the bold line, is ground in order, and the base part a of the ultra-thin rod 4 is ground. By repeating this process for the number of sides that the tip b has, the tip b is ground into a pyramid shape or the like. When shifting the upper and lower plates 6 and 7, the base part a is in a stable state with the bold line side and the lower plate 7 in close contact with each other in FIG. It has the property of rolling to the next stable state B all at once when a large force is applied without being able to shift it, so the thin shaft rod 4 can be rotated reliably, forming extremely precise and uniform edges. You can.

In the explanation of the above embodiment and FIG. 1, the square cross-sectional shapes formed in advance by press working are described as similar shapes with the same directionality, but even if they are not in the same direction but in the opposite direction, it is possible to cut the opposite side. As long as the shapes are similar, it is sufficient that the shapes are similar. Furthermore, even for similar shapes, as long as the angles formed by the respective sides are the same, there is no problem with the difference in the side lengths, that is, the protrusion of the edges of the press-formed cross section. In the present invention, the shapes in which the angles formed by the sides are the same have been described as similar shapes, so it should be added that such changes are possible.

Further, the molded part of the ultra-fine material that has been press-formed in advance may be a part of the base of the ultra-fine material, or the base excluding the base end as shown in FIG. It's good to have.

<Effects of the Invention> As described above, in the method according to the present invention, an angular cross-section having a similar shape to the angular cross-section to be formed at the tip of the ultra-fine material used as the raw material for the needle-like medical device is prepared in advance by pressing at the base portion of the ultra-fine material that is the raw material of the needle-like medical device. The press-formed part of the ultra-fine material formed in this way is held by a chuck consisting of upper and lower plates, and by shifting the upper and lower plates of the chuck, the ultra-fine material is rolled and rotated. It is possible to rotate all the ultra-fine materials evenly and reliably even if they are gripped in parallel with a chuck, and therefore grinding can be performed with high precision without the need for skill, and it is possible to grind by visual inspection as in the past. Grinding correction is not required, so
It is possible to automate all grinding work, and therefore mass-produce high-precision products at low cost.Furthermore, if the gripping surface of the chuck is hard as in the past, the extremely fine material that does not come into contact with this gripping surface will come out. Also, if the gripping surface is soft, there will be more contact surfaces with the ultra-fine material, resulting in variations in the rolling angle, and the rolling angle may change after rolling, making it difficult to grind with high precision. However, since the present invention is carried out by the method described above, the above-mentioned drawbacks of the conventional method can be fundamentally overcome by taking measures such as selecting a gripping surface that is a little softer than when using a round bar. This can be solved in a particularly
It has the characteristics that special effects can be obtained by combining the technology shown in the No. 144651 publication and the present invention.

[Brief explanation of the drawing]

1 to 3 are simplified explanatory diagrams showing an example of the method of the present application. 1, 2, 3, 4 are extra thin rods, 5 is a chuck,
6 is an upper plate, 7 is a lower plate, 8 is a grindstone, a is a base part, and b is a tip part.

Claims (1)

[Claims] 1 Press-form in advance a square cross-section having a similar cross-sectional shape to the tip formed at the tip of the ultra-fine material on the base of the ultra-fine material, and form a chuck consisting of two upper and lower pieces with parallel gripping surfaces as described above. A large number of press-formed parts of ultra-fine materials are gripped in a line so that their cross sections face in the same direction, and the two upper and lower gripping surfaces of the chuck are held in a direction perpendicular to the axis of the ultra-fine materials. The tips of the ultra-fine materials are ground to a predetermined rectangular cross-section with a grindstone or the like while the polygonal surfaces of the press-formed parts of the ultra-fine materials are aligned all at once by shifting them from each other to form edges and cutting edges. A method for grinding ultra-fine materials for medical use.