JP2010104697A - Method of manufacturing medical ultrafine implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical and efficient method of manufacturing a medical ultrafine implement by reducing the amount of a base material to be disposed. <P>SOLUTION: The amount of the base material to be disposed is reduced in manufacturing the medical ultrafine implement, where a product length is previously set, by the method of manufacturing the medical ultrafine implement including: a process for gripping the bar shape base material, whose length is equal to or more than a portion for the two products, and forming the first grinding part or blade part at one end; a process for cutting the base material, so as to perform division into the base material having the first grinding part or blade part by the set product length and the base material remained after cutting; a process for gripping the base material remained after cutting, and forming the second grinding part or blade part at one end; and a process for removing the extra length portion of the base material, so as to manufacture the base material having the second grinding part or blade part by the set product length. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for economically and efficiently producing a medical ultrafine instrument such as a dental root canal treatment instrument.

  There is a dental root canal treatment instrument as one of the medical ultrafine instruments. FIG. 5 is a perspective view of a reamer that is an example of a dental root canal treatment instrument. The reamer 30 or the like is used for cutting the surface of the calcified root canal wall to form a root canal, and has a spiral blade portion 13a.

  FIG. 6 is a diagram for explaining a manufacturing process of a conventional dental root canal treatment instrument, in which (a) is a side view showing a round bar-shaped material, and (b) is a side view showing a material having a tapered grinding part, (C) is the side view which twisted and formed the blade part and cut | disconnected the excess length. Here, the torsion processing refers to forming the spiral blade portion 13a by gripping the tip end portion of the material 12 having a tapered grinding portion and rotating the shaft.

  FIGS. 7A and 7B are diagrams showing a material grinding method using a circular grindstone, in which FIG. 7A is a side view and FIG. 7B is a plan view. A round bar-shaped material 11 shown in FIG. 6A is mounted on a holder 33 such as a vice, and one end of the round bar-shaped material 11 is pressed against the outer circumference of the circular grindstone 31 by a presser foot 32 and ground. And by this grinding, as shown in FIG.6 (b), the taper grinding part 12a is formed in the raw material 11 of a round bar. Since the grinding part 12a has a quadrangular cross-sectional shape, the grinding work is performed four times by rotating the material 11 by 90 degrees. In FIG. 7, a plurality of materials 11 are ground simultaneously, but may be ground one by one.

  Here, in the formation of the tapered grinding part 12a, when the round bar-shaped material 11 is ground, it is a circular grindstone having a large diameter and is approximately 25 times the grinding length of the material in order to make a linear taper. It is desirable to use a circular grindstone 31 having the above diameter. And when using the circular grindstone 31 with such a large diameter, the holder 33 is easy to hit the circular grindstone 31. In order to prevent this, the material 11 is curved as shown in FIG. 7A so that the distance d can be maintained. To reduce the curvature of the material, Patent Document 1 (Japanese Patent Publication No. 4-23539) is used. ) The length of the material should be longer than the actual product length. That is, the round bar-shaped material 11 having a length obtained by adding not only the preset product length L1 but also the extra length L2 is ground.

And as shown in FIG.6 (c), after forming the helical blade part 13a by twisting a front-end | tip part, in order to cut off the extra length, it cut | disconnects by the cross section DD.
Japanese Patent Publication No. 4-23539

  However, the material to be discarded having a length L2 is usually a product having a length equal to or longer than the length L1 of the product, and even though it is a substantial amount when manufactured in large quantities, the present situation is that most of the material is discarded at present. The method is taken.

  In view of such circumstances, the present invention seeks to provide an economical and efficient method for manufacturing a medical ultrathin instrument by reducing the amount of material to be discarded.

  The present invention provides a method for manufacturing a medical ultrafine instrument in which the length of a product is set in advance, grips a bar-shaped material having a length equal to or longer than two products, and forms a first grinding portion or blade portion at one end. Cutting the material on which the first grinding portion or blade portion is formed, and dividing the material into the material having the first grinding portion or blade portion with the set product length and the material remaining after cutting And gripping the material remaining after cutting, forming a second grinding part or blade part at one end, and cutting off the extra length of the material on which the second grinding part or blade part is formed, And a step of producing a material having a second grinding part or a blade part with a set product length.

  In addition, a rod-shaped material having a length of two or more products is gripped, a step of forming a first grinding portion or blade portion at one end portion, and a material on which the first grinding portion or blade portion is formed are gripped And forming the second grinding part or blade part at the other end, cutting the first grinding part or blade part and the material on which the second grinding part or blade part is formed, and performing the first grinding And a step of manufacturing the material having the part or the blade part and the length of the product in which the second grinding part or the material having the blade part is set.

  Here, each process of forming the first grinding part or the blade part and the second grinding part or the blade part is performed by pressing the vicinity of the end of the rod-shaped material against the outer periphery of the circular grindstone and grinding. It is possible to include a step of twisting the tapered grinding portion thus formed to form a spiral blade portion. In addition, the grinding wheel formed so as to form a predetermined rake face and flank is pressed to the position where the blade part is formed while rotating, and the material is moved in the axial direction while rotating the material, thereby forming a spiral shape by grinding. It may include a step of forming a blade portion, a step of deburring using electrolytic polishing or chemical polishing, and the like.

  According to the present invention, it is possible to reduce the amount of material that has conventionally been discarded after cutting, and if the same number of products are manufactured, it is possible to achieve an excellent effect that at least half of the conventional amount is required. .

  Also, when cutting the length of the product after forming the blades at both ends of the material, the deburring process can be performed for two products at the same time, so the manufacturing process becomes more efficient. Can also play.

  Examples of medical ultrathin devices that can be produced according to the present invention include root canal treatment devices such as dental reamer files, or ophthalmic knives. Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a diagram for explaining a manufacturing process of a dental root canal treatment instrument according to a first embodiment of the present invention. (A) is a side view showing a round bar-shaped material, (b) is a side view showing a material having a tapered grinding part at one end, and (c) is a blade part formed by twisting the tapered grinding part. The side view cut to the length of the product, (d) is a side view in which a tapered grinding part is formed at one end of the material remaining after cutting, (e) is torsion processing the tapered grinding part, It is the figure which excised the material for surplus length. In the first embodiment, first, product lengths L1 and L1 ′ and an extra length L2 are set in advance, and the lengths (L1 + L1 ′ + L2) of two products or more shown in FIG. ) Is held with a holder. Then, a material having a tapered grinding portion as shown in FIG. 1B is obtained by grinding the vicinity of the end portion by a method using a circular grindstone having a diameter of about 25 times the grinding length of the material shown in FIG. 12 is formed. After the grinding portion 12a is twisted to form a spiral blade portion 13a, the section L-D is cut so as to have a preset product length L1, as shown in FIG. It is divided into a material 13 (length L1) having a blade portion and a material 11a (length L1 ′ + L2) remaining after cutting. Thereafter, as shown in FIGS. 1D and 1E, the material 11a remaining after being cut is gripped by a holder, and the same grinding and twisting process is performed to form a blade portion. Another material 13 having a preset product length L1 ′ is manufactured by cutting along a section DD. The cutting may be performed at any stage as long as the grinding part 12a is formed with a circular grindstone, and is not limited after the twisting process is performed to form the spiral blade part 13a.

  If manufactured by such a method, the amount of the material 11b to be discarded can be reduced, and if the same number of products are manufactured, at least half of the conventional discarded amount is sufficient. Specifically, in order to manufacture one product in the past, a material having a length of L1 (L1 ′) + L2 (the set product length + the extra length) is required. Two products can be manufactured from a length of material. Therefore, since two products can be manufactured from one raw material, not only is it efficient, but the amount of waste can be halved, so there is also an economic effect.

  Note that the lengths of L1 and L1 ′ are preferably the same, but are not limited to the same length, and may be set with different lengths. Further, the length of L2 needs to be set so as not to hinder quality and work. Therefore, the lower limit of the length of L1 + L1 ′ + L2 is preferably set such that the material holder does not interfere with the circular grindstone and the upper limit is set such that the warp of the material does not increase.

  FIG. 2 is a diagram for explaining a manufacturing process of a dental root canal treatment instrument according to a second embodiment of the present invention. (A) is a side view showing a round bar-shaped material, (b) is a side view showing a material having tapered grinding portions at both ends, and (c) is a blade at both ends by twisting the tapered grinding portions. It is the side view which formed the part and cut | disconnected the extra length. In the second embodiment, first, product lengths L1 and L1 ′ and an extra length L2 are set in advance, and the lengths (L1 + L1 ′ + L2) of two products or more shown in FIG. ) Is held by a holder. Then, one end is ground by a method using a circular grindstone having a diameter of about 25 times or more of the grinding length of the material shown in FIG. 7, and the other material is similarly ground by reversing the material. A material 12 having a tapered grinding part is formed at both ends as shown in 2 (b). When this grinding part 12a is twisted to form spiral blade parts 13a at both ends, and cut in a cross section DD to obtain preset product lengths L1, L1 ′, FIG. The material 13 having a spiral blade portion as in c) is divided into two (lengths L1 and L1 ′) and an extra length 11b (length L2). Here, when the twisting process is performed on the material 12 having the grinding part at both ends, the twisting process may be performed on both ends and then cut into the size of each product. After the product is cut to the length of the product, the other end can be twisted and cut to the product length. After the grinding part 12a is formed with a circular grindstone, the cutting can be performed at any stage. It can be done and is not limited. In addition, it is desirable in terms of work that the lengths of L1 and L1 ′ are the same, but the length is not limited to the same length, and the lengths may be changed.

  Here, when forming a grinding part at both ends or applying a twisting process to both ends, it is possible to hold a portion that is not the other blade part with a holding tool when one of the processes is performed. Therefore, the extra length 11b can be further reduced, and in some cases, the extra length 11b can be eliminated. That is, since two grinding parts or blade parts are formed from a material having a length of L1 + L1 ′ + L2 and then cut, L2 can be made smaller than Example 1 and L2 = 0 can be achieved. In fact, the portion gripped by the holding tool in each of the above steps does not require a very large area, and is at most 27 mm or less in the grinding process with a circular grindstone, about 16 mm in the twisting process, and at most in the cutting process. Since it is about 38 mm, even when the same processing is applied to the other end portion after the end portion is processed as in the second embodiment, the post processing is performed without contacting the processed portion of the one end portion. Is possible. Of course, it is possible to devise without damaging the processed portion. For example, in the grinding process, a configuration may be adopted in which the material is not damaged by providing urethane resin in the holding portion of the holder. Therefore, according to the present invention, it is possible to ensure the same quality as in the case of manufacturing one product from a single material, and to improve production efficiency, economy, and environmental performance.

  The process for forming the blade portion may include a deburring operation by electrolytic polishing or chemical polishing performed after twisting. Deburring by electrolytic polishing is to remove burrs generated by grinding by immersing a material in which a blade portion, which is a workpiece, is formed in an electrolytic solution and applying a DC voltage. Similarly to the above, chemical polishing is to remove burrs by immersing the material on which the blade portion is formed in a chemical polishing solution. Deburring may be performed when the blade is formed at one end of the material, or deburring may be performed after forming the blade at both ends. Here, if the deburring can be performed after forming the blade portions at both ends, the deburring operation for two products can be performed by one deburring operation, so the operation is efficient.

  FIG. 3A is a view for explaining a method of forming a spiral blade portion by grinding, and shows a third embodiment of the present invention. In the third embodiment, a material 15 having a spiral blade portion 15a is formed by directly grinding a round bar-shaped material having a preset tip diameter and taper. As a grinding process, the raw material is gripped by a chuck 14 that can rotate and move in the axial direction of the raw material, and a rake face 15b and a flank 15c of the blade part are formed in a tapered portion of the raw material forming the blade part. The shape grindstone 16 is pressed while rotating in the α direction. Here, by moving the material in the axial direction X while rotating the material in the β direction, the blade portion can be cut out spirally. At this time, since a portion for gripping the material is necessary, forming the blade portions at both ends of the material can reduce the amount of the material to be discarded, which is considered to be economical. In addition, when grinding is performed using a portion that does not become a blade portion of the product, the extra length can be eliminated.

  In this manufacturing method, twisting is not performed, but it is necessary to deburr. Therefore, if the deburring is performed before cutting after forming the blades at both ends, two products can be obtained by one deburring operation. Since the deburring of the minute can be performed, the work is efficient.

  FIG. 3B is a view for explaining a method of forming a flat grinding portion on a material using an apparatus different from those in the first and second embodiments. As a grinding process, the material can be rotated by a chuck 17 that can change the gripping angle θ, and a grindstone 19 that can move in the axial direction of the material is placed on the taper portion of the material 18 that forms the blade portion in the α direction. And pressing while moving in the axial direction X of the material.

  4A and 4B are views showing an ophthalmic knife, in which FIG. 4A is a plan view, FIG. 4B is a right end view, FIG. 4C is a side view, and FIG. . The ophthalmic knife 20 is manufactured by pressing one end of a round bar-shaped material to form a flat portion 20a, and the flat portion 20a has a diameter of about 25 times the grinding length of the material shown in FIG. The surface grinding part 20b is formed by grinding using a circular grindstone. Then, the part used as a cutting blade is ground with another grinding apparatus, the cutting blade part 20c is formed, and it is set as a blade part. In other words, since the same grinding method as that used for grinding the tapered grinding part of the root canal treatment instrument is used, a part to be gripped by the holding tool is necessary during grinding, and the problem related to discarding the extra length after cutting is also the same It is. Therefore, even in the case of an ophthalmic knife, if the method of forming the blades at both ends of the material is applied, the amount of the material to be discarded can be reduced and the production can be made economically. In the case of an ophthalmic knife, the sharpness will be lost if the cutting blade touches the hand or the like during the operation. Therefore, the method of Example 1 (the method of cutting after forming the cutting blade on one side) is applied, or When applying the method of Example 2, it is preferable to cut and manufacture after forming the surface grinding part 20b. In the case of an ophthalmic knife, deburring is performed in the same manner as in the above embodiment.

  In addition, it is thought that the manufacturing method of the medical ultrafine instrument of this invention is not limited to above-described embodiment, It can be naturally utilized also for the manufacturing method of other medical ultrafine instruments.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the manufacturing process of the dental root canal treatment instrument which is 1st Example of this invention, (a) is a side view which shows a round bar-shaped raw material, (b) is a taper grinding part at one end part. The side view which shows the raw material which has, (c) is a side view which gave the blade part by twisting a taper grinding part, and was cut | disconnected to the length of the product, (d) is one end part of the raw material which remained after cutting | disconnection The side view which formed the taper grinding part, (e) is the figure which performed the twist process to the taper grinding part, and excised the raw material for excess length. It is a figure explaining the manufacturing process of the dental root canal treatment instrument which is 2nd Example of this invention, (a) is a side view which shows a round bar-shaped raw material, (b) is a tapered grinding part in both ends. The side view which shows the raw material which has, (c) is a side view which performed the twist process to the taper grinding part, formed the blade part in both ends, and cut | disconnected the extra length. (A) is a figure explaining the method of forming the helical blade part by grinding, (b) is a figure explaining the method of forming the flat grinding part in a raw material. It is a figure which shows the ophthalmic knife, (a) is a top view, (b) is a right end figure, (c) is a side view, (d) is AA sectional drawing of (a). It is a perspective view of a reamer which is an example of a dental root canal treatment instrument. It is a figure explaining the manufacturing process of the conventional dental root canal treatment instrument, (a) is a side view which shows a round bar-shaped raw material, (b) is a side view which shows the raw material which has a tapered grinding part, (c) is It is the side view which twisted and formed the blade part and cut | disconnected the extra length. It is a figure which shows the grinding method of the raw material using a circular grindstone, (a) is a side view, (b) is a top view.

Explanation of symbols

11 Round bar-shaped material 11a Material remaining after cutting 11b Material to be discarded (extra length)
12 Material having a tapered grinding portion 12a Tapered grinding portion 13 Material having a blade portion 13a Blade portions 14, 17 Chuck 15 Material having a helical blade portion by grinding 15a Helical blade portion by grinding 15b Rake face 15c Escape Surfaces 16 and 19 Rotating whetstone 18 Material for forming a flat grinding part 20 Ophthalmic knife 31 Circular whetstone 32 Presser foot 33 Holding tool

Claims (6)

In the manufacturing method of a medical ultrathin instrument in which the length of the product is set in advance,
Gripping a rod-shaped material having a length of two or more products, and forming a first grinding part or blade part at one end part; and
Cutting the material on which the first grinding part or blade part is formed, dividing the material having the first grinding part or blade part with the set product length, and the material remaining after cutting;
Gripping the material remaining after the cutting, forming a second grinding part or blade part at one end; and
Cutting the surplus length of the material on which the second grinding part or blade part is formed, and manufacturing the material having the second grinding part or blade part with the set product length;
A method for producing a medical ultrathin device, comprising: In the manufacturing method of a medical ultrathin instrument in which the length of the product is set in advance,
Gripping a rod-shaped material having a length of two or more products, and forming a first grinding part or blade part at one end part; and
Gripping the material on which the first grinding part or blade part is formed, and forming the second grinding part or blade part at the other end part; and
The material having the first grinding part or blade part and the material having the second grinding part or blade part by cutting the material on which the first grinding part or blade part and the second grinding part or blade part are formed. The process of manufacturing to the length of the set product,
A method for producing a medical ultrathin device, comprising:   Each step of forming the first grinding part or blade part and the second grinding part or blade part includes grinding by pressing the vicinity of the end of the rod-shaped material against the outer periphery of the circular grindstone. The manufacturing method of the medical ultrafine instrument of Claim 1 or 2 characterized by these.   In each step of forming the first grinding part or blade part and the second grinding part or blade part, the tapered grinding part formed by grinding near the end of the rod-shaped material is twisted. The manufacturing method of the medical ultrafine instrument in any one of Claims 1-3 including the process of forming a helical blade part.   Each step of forming the first grinding part or blade part and the second grinding part or blade part forms the blade part while rotating the grindstone formed so as to form a predetermined rake face and flank face. The method of claim 1, further comprising a step of forming a helical blade portion by grinding by pressing to a position to be moved and moving the material in an axial direction while rotating the material. Instrument manufacturing method.   2. Each step of forming the first grinding part or blade part and the second grinding part or blade part includes a step of performing deburring using electrolytic polishing or chemical polishing. The manufacturing method of the medical ultrafine instrument in any one of -5.

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