JPH09253110A - Ingrown nail correcting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regularly work a stable correcting force without increasing the thickness, and exhibit excellent correcting performance by forming an ingrown nail correcting tool of a material having a super-elastic effect which is subjected to a storage processing to a prescribed shape, and mounting it on the surface of the nail of a human body with being deformed into a form different from the stored shape. SOLUTION: An ingrown nail correcting tool 21 is manufactured by preliminarily setting the transformation point to 27 deg.C, for example, which is lower than the body temperature of human body, and performing a storage processing to a flat form. When this ingrown nail correcting tool 21 is mounted on the nail 2 of a finger 1 of foot, for example, an adhesive 22 is applied to the surface, and it is deformed into a circular arc according to the curve of the nail 2. Thus, the ingrown nail correcting tool 21 having super-elastic effect is apt to return the stored original flat shape to gently and continuously work a stable correcting force to the ingrown part 2a of the nail 2, whereby the ingrown part 2a is gradually pulled up outward and corrected without pain.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a correction tool for correcting the invaded part by seeding on the surface of the nail of the human body in which the invaded part is formed.

[0002]

2. Description of the Related Art As shown in FIGS. 9 and 10, an ingrown nail is bent on the skin of the finger 1 such that the side edge of the nail 2 of the toe 1 is rolled inward as the indented portion 2a. It is a disease that bites the skin tissue and causes pain.

FIG. 10 (a) shows a state in which the side edge of the nail 2 is bent inward as compared with a normal nail 2A shown by a chain line, and FIG. 10 (b) shows a more severe depression. It shows a claw, and the degree of bending of the claw 2 is further increased. Such an ingrown nail causes severe pain when a shoe is put on the foot and the finger 1 is strongly pressed.

The following method has been proposed as one of the methods for treating ingrown nails. This method uses a plate-shaped spring material made of special steel or synthetic resin as shown in FIG.
The straightening tool a is formed by cutting it into a length about the width of. An adhesive is applied to the back surface of this straightener b. Then, the correction tool a is placed in the center of the surface of the nail 2,
After that, the entire correction tool (i) is adhered to the surface of the nail 2 with a stick.

At this time, the correction tool (i) is adhered to the nail 2 in a forcibly curved shape according to the shape of the surface of the nail 2. Therefore, the correction tool (i) has a restoring force to return to the original shape. This restoring force acts on the nail 2 to correct the indented portion of the nail 2 so as to be flat.

[0006]

As described above, in order to treat the ingrown nail, a method of correcting the ingrown nail using a correction tool formed of metal or synthetic resin has been developed. In this method, the orthodontic appliance exerts a force on the nail that restores the original shape within the elastic range of the material.

In the case of a correction tool made of special steel, it can be made thin because it has a large elastic coefficient and a large force can be used. However, the elastic deformation strain of the correction tool made of this metal is at most about 0.5%, and if the tape is deformed to the extent that a tape having a thickness of 0.1 mm is wound around a rod having a radius of curvature of less than 10 mm, the correction tool remains deformed. Even when it is attached to the nail, there is a problem in that if it is bent too much, it will be permanently deformed and the force cannot be effectively used. In addition, the correction device made of metal suddenly loses its force when it is restored to its original shape and needs to be replaced.

In the case of a correction tool made of synthetic resin, since the elastic coefficient is small, it is possible to increase the thickness and secure the force acting on the nail. However, if the correction tool is thick, it is not practical because there is a problem that it is difficult to adhere to the portion where the bending of the nail is large and peels easily.

As described above, the conventional ingrown nail correction tool cannot always exert a stable correction force on the nail, and if it is increased to apply the correction force to the nail, the nail correction tool is increased. There is a problem that the attachment to is unstable.

The present invention has been made based on the above circumstances, and it is possible to continuously exert a stable straightening force on the nail without increasing the thickness, and it is possible to obtain excellent straightening performance. It is an object of the present invention to provide an ingrown nail correction tool having excellent properties.

[0011]

According to a first aspect of the present invention, there is provided an ingrown nail correction tool for correcting an invaginated portion formed on a nail of a human body, which is made of a material having a superelastic effect which is memorized in a predetermined shape. It is characterized in that it is formed, deformed into a shape different from the shape subjected to the memory processing, and attached to the surface of the nail of the human body.

A second aspect of the present invention is the ingrown nail correction tool according to the first aspect, wherein the material having a superelastic effect is a Ni-Ti alloy. A third aspect of the present invention is characterized in that, in the ingrown nail correction tool according to the first or second aspect, the material having a superelastic effect is in the form of a tape.

The invention according to claim 4 is the ingrown nail correction tool according to claim 1 or 2, wherein the material having a superelastic effect is linear. The invention of the present application will be described.

The superelastic effect means a property of returning to an original shape when an external force is removed even if the material is deformed by applying an external force.
As shown in the diagram of FIG. 6A, the external force and the elongation in a normal metal have a relationship that the metal is permanently deformed when the external force is removed after the metal is deformed by applying the external force.

Further, the external force and the elongation in the metal having the shape memory effect, as shown in the diagram of FIG. 6 (b), are stored in the metal in advance so as to recover the shape at a temperature higher than room temperature, for example. After deforming by applying an external force at a room temperature lower than the transformation point, if the external force is removed and heating is performed, the shape is restored to the original shape that has been memorized again. In the case of the irreversible shape memory effect, the deformed shape does not return even if the temperature is low, that is, room temperature.

On the other hand, the external force and the elongation in the metal having the superelastic effect are as shown in the diagram of FIG. 6 (c).
When a metal whose shape is memorized at a temperature (transformation point) lower than room temperature is deformed by applying an external force to the metal at a temperature higher than the transformation point, for example, room temperature, and then the external force is removed, the original metal is restored at room temperature again. It has a relationship of returning to the shape. Therefore, the metal having the superelastic effect returns to the original shape stored by removing the external force even if it is deformed at a temperature higher than the transformation point, for example, at room temperature by about 10%.

As the material exhibiting the superelastic effect, there are several metals. As a metal showing the superelastic effect,
Cu-Zn ternary alloys, single crystals or polycrystals such as Cu-Al-Ni alloys, or Ni-Ti alloys can be used. In the Ni-Ti alloy, Ni is 50.5a.
Binary alloy of t% or more and 52.0 at% or less, Fe, C
Examples include alloys containing one or two or more of r, Co, V, Cu, etc. in total of about 10 at% or less. By using these alloys, a sufficient superelastic effect can be exhibited.

In order to investigate the superelastic effect in an alloy having a superelastic effect, a linear test piece made of a Ni--Ti alloy having a superelastic effect, a linear test piece made of a Co--Cr alloy, and stainless steel. A bending test based on the ADA standard shown in FIG. 6 was performed on each of the linear test pieces formed of steel and having a diameter of 0.4 mm. In this bending test, an external force is applied to each test piece to bend it up to an angle of 90 °, a bending moment generated is measured, and the strain in each test piece when the external force is removed after bending to 90 ° The state of is investigated.

That is, in this bending test, as shown in FIG. 7, one end of the test piece 11 is fixed by a mounting fixture 12, and the other end is provided with a predetermined span with respect to the test piece 11 to provide a stopper 13. The test piece 11 is supported by, and an external force is applied to the test piece 11 to bend the test piece 11. The wire diameter of each test piece is 0.4 mm as an example, and the span between the mounting fixture 12 and the stopper 13 is 25.4 mm.

The results of this test are shown in the diagram of FIG. According to this diagram, the following can be understood. A test piece formed of a Ni-Ti alloy, which is a material having a superelastic effect, does not remain deformed when an external force is applied to bend it to an angle of 90 ° and then the external force is removed (unloading). The original shape before adding was restored.

However, the test piece made of stainless steel and the test piece made of Co--Cr alloy were each subjected to an external force, bent to an angle of 90 °, and then removed from the external force (at the time of unloading). Bending deformation of more than ° remained.

That is, Ni--Ti having a superelastic effect
The test piece formed of the alloy returns to its original shape when the external force is removed without being permanently deformed even with a large deformation. Moreover,
An almost constant bending moment is generated in the bending angle-bending moment curve when the external force is removed (unloading).

The force exerted when the test piece formed of the Ni--Ti alloy having the superelastic effect returns to its original shape depends on the force of the test piece formed of stainless steel and the test piece formed of the Co--Cr alloy. Small compared to the force acting when returning to the shape of. However, this has an elastic modulus of 6000-70.
It is considered to be 00 kg / mm ^2, and this is because the elastic modulus is about 1/3 that of stainless steel. This point can be solved by slightly changing the shape of the correction tool and increasing the force of the correction tool when manufacturing the ingrown nail correction tool with a Ni-Ti alloy.

That is, a metal having a superelastic effect can be deformed in a wide range by applying an external force at a temperature higher than the transformation point, and further, after removing the external force, a process of returning to the original shape that has been subjected to the memory treatment. In, there is little change in the force, and the force is applied gradually and continuously.

In order to manufacture an ingrown nail correction tool using an alloy having a superelastic effect, an alloy having a superelastic effect is preliminarily formed into a predetermined shape, for example, flat (straight line, plane) or a normal nail. The memory processing is performed on the shape along the curve in the width direction. This storage process is performed by a conventionally known heat treatment.

When the ingrown nail correction tool is used, the ingrown nail correction tool is deformed into a shape different from the memory-processed shape described above, specifically, a shape curved in an arc according to the curvature of the nail. . The deformed ingrown nail correction tool exerts an elastic force (recovery force) on the nail to return to the original shape. This elastic force acts on the indented portion of the ingrown nail as a force (correction force) for correcting the indented portion into a flat or normal curve in the width direction of the nail.

As a result, the ingrown nail correction tool having the superelastic effect gently and continuously acts on the nail with a sufficiently stable correction force. As a result, the ingrown nail correction tool reliably and reliably corrects the ingrown portion of the ingrown nail.

Moreover, since the ingrown nail correction tool exerts a sufficient correction force on the nail by the superelastic effect, it is not necessary to increase the thickness to obtain a sufficient correction force, and the thickness is increased. This avoids the problem that the nail cannot be securely attached.

Therefore, the ingrown nail correction tool formed of the material having the superelastic effect according to the first aspect of the present invention combines a wide range of elastic deformation due to the superelastic effect with a restoring force due to an appropriate elastic coefficient to always apply to the nail. On the other hand, a stable straightening force can be continuously exerted, and excellent straightening performance is stably exhibited with excellent reliability.

Further, by adopting the Ni-Ti alloy of the invention of claim 2 as the material having the superelastic effect for forming the ingrown nail correction tool of the invention of claim 1, the superelastic effect is sufficiently exhibited. An ingrown nail correction tool can be manufactured.

Further, the inventions of claims 3 and 4 are made of a material having a superelastic effect, which forms the ingrown nail correction tool of claim 1 or 2, such as a round wire or a square wire. It is possible to manufacture an ingrown nail correction tool that sufficiently exhibits a superelastic effect by setting one or a plurality of linear bodies or a tape state.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. This embodiment is directed to a correction tool that corrects an invaginated portion formed on the nail of the big toe of a human body.

In FIGS. 2 and 3, reference numeral 1 is the big toe of the human body, and 2 is the nail of the thumb 1. The side edge of the claw 2 has a recess 2a.
Has occurred. FIG. 1 shows an ingrown nail correction tool 21 which is an embodiment of the present invention. The ingrown nail correction tool 21 is in the form of a tape, and the ingrown nail correction tool 21 takes into consideration the width dimension of the nail 2 of the toe 1 to be corrected as shown in FIG. When the tool 21 is attached along the nail 2, the nail 2
It is necessary to have a length that can be attached to the indented portions 2a formed on both side edges of the. For example, the ingrown nail correction tool 21 has a width of 3 mm and a length of 14
It is formed as a tape having a thickness of 0.2 mm and a thickness of 0.2 mm.

The ingrown nail correction tool 21 is made of a material having superelasticity, for example, a plate material of Ni-Ti alloy.
In Ni-Ti alloys, Ni is 50.5 at% or more and 2
Examples include an original alloy and an alloy containing one or two or more of Fe, Cr, Co, V, Cu, etc. in total of about 10 at% or less.

The ingrown nail correction tool 21 is preliminarily set as a transformation point (Af) at a temperature of 30 ° C. or lower, which is lower than the body temperature of the human body, for example, 27 ° C., considering that the place where it is used is a part of the human body. Then, the memory is processed into a flat shape and it is manufactured.

Then, the ingrown nail correction tool 21 is attached to the toe 1 of the toe.
When attaching to the nail 2, the appropriate adhesive 22 is applied to the surface of the nail 2 as shown in FIG. 2, and the ingrown nail correction tool 21 is arranged along the width direction of the nail 2 and bonded. Place on agent 22.
The adhesive 22 is one that does not adversely affect the nails and the human body.

Usually, the claw 2 is curved so as to draw an arc along the width direction. For this reason, the ingrown nail correction tool 21 is
Curved along the width direction of the
It adheres to the surface of the nail 2 via 3. The ingrown nail correction tool 21 also adheres to the ingrown portions 2 a formed on both side edges of the nail 2.

Then, force is applied to the ingrown nail correction tool 21 from the outside until the ingrown nail correction tool 21 is surely adhered to the surface of the nail 2. As a result, as shown in FIG. 3, the ingrown nail correction tool 2
1 is deformed into a shape different from the shape subjected to the memory processing, specifically, a shape curved in an arc shape matching the curvature of the nail 2, and attached to the nail 2.

As described above, the ingrown nail correction tool 21 is used for adhering to the surface of the nail 2 to correct the ingrown portion 2a of the nail 2. That is, it is flat so as to recover the shape, or the nail 2
The ingrown nail correction tool 21 whose shape is memorized so as to follow the curve in the width direction is bent and deformed under the human body temperature which is a use temperature higher than its transformation point, and is attached to the nail 2 for use.

Then, the ingrown nail correction tool 21 having a superelastic effect tends to return to the original shape that has been subjected to the memory processing, that is, the flat shape. Therefore, as shown in FIG. 3, the ingrown nail correction tool 21 exerts an elastic force (recovery force) on the nail 2 to return to the original shape. This elastic force serves as a force (correction force) for flatly correcting the indented portion of the nail 2.

Here, as described above, the metal having the superelastic effect can be deformed in a wide range by applying an external force,
In addition, after the external force is removed, in the process of returning to the original shape that has been memorized, the force changes little and a gentle restoration curve is drawn.

Therefore, the ingrown nail correction tool 21 having a superelastic effect gently and continuously acts on the indented portion 2a of the nail 2 with a stable correction force. As a result, the indented portion 2 of the nail 2
“a” is gradually lifted outward without any difficulty and is corrected without pain.

An ingrown nail correction tool 21 having a superelastic effect in particular
Acts to restore the original shape when attached to the human body and applies a correction force to the nail 2, so that the deformed shape as in the case of a shape memory alloy is restored to the original shape. There is no need to add a special means of heating to do this.

As described above, the ingrown nail correction tool 21 formed of a material having a superelastic effect is always stable against the nail 2 by combining a wide range of elastic deformation due to the superelastic effect and a recovery force due to an appropriate elastic coefficient. It is capable of continuously exerting the corrective force, and has excellent reliability that stably exhibits excellent corrective performance.

In the above-described embodiment, the ingrown nail correction tool 21 is used.
Is processed into a flat shape, but the shape to be stored is not limited to this. For example, the memory processing can be performed in a curved shape. In this case, it is very advantageous in manufacturing the ingrown nail correction tool 21.

That is, for example, a long tape made of an alloy having a superelastic effect for performing a memory treatment on a curved shape is wound in multiple layers around a core metal having an outer diameter of 50 mm, and the temperature is lower than the body temperature of the human body. For example, the shape memory process is performed so that the recovery temperature becomes 30 ° C. The entire tape is stored in a curved shape. Then, each time the wound tape is used, it is cut into a desired length along the length of the affected part of the nail, so that the ingrown nail correction tool can be used with an appropriate length without waste.

As described above, in the above-described embodiments, the ingrown nail correction tool is formed in a tape shape, but the ingrown nail correction tool of this configuration is very convenient in manufacturing and handling.
In addition, by coating the surface of the ingrown nail correction tool with a resin such as urethane resin or silicone resin, the ingrown nail correction tool is less likely to damage footwear such as socks, and the adhesive strength can be easily adjusted. Become.

In the above-described embodiment, Ni-T is used as an alloy having a superelastic effect to form the ingrown nail correction tool.
Although an i-based alloy is adopted, in addition to this, as an alloy having a superelastic effect, a Cu-Zn-based ternary alloy, Cu-Al-N is used.
Examples include i-based alloys. By using these alloys, a sufficient superelastic effect can be exhibited.

FIG. 4 shows a second embodiment. 4, the same parts as those in FIG. 3 are designated by the same reference numerals. Tape-shaped ingrown nail correction tools 31 are stacked and supported by a tape-shaped support body 32, and are held by a pressing body 33 made of an adhesive tape. The support 32 is attached to the surface of the nail 2 with an adhesive 22. The present invention also includes such an embodiment.

The present invention is not limited to the above-mentioned embodiments, but can be modified in various ways. For example,
The material having a superelastic effect is not limited to metals and alloys, and various other materials can be used. Further, the shape of the ingrown nail correction tool is not limited to the embodiment described above. For example, as the ingrown nail correction tool, one or more wire rods such as the round wire and the square wire shown in FIG. 5 may be adopted.
(A) has shown the ingrown nail correction tool 41 which consists of a round line. The ingrown nail correction tool 41 is used, for example, by adhering a plurality of nails to the nail 2 as shown in FIG. For example, the same effect as that of the first embodiment described above can be obtained by using seven round wires having a diameter of 0.3 mm in combination.

The means for adhering the ingrown nail correction tool to the nail may be either applying the adhesive to the ingrown nail correction tool or applying the adhesive to the nail. Further, the means for attaching the ingrown nail correction tool to the nail is not limited to using an adhesive, and it is also possible to attach the ingrown nail correction tool to the nail using, for example, a double-sided adhesive tape.

[0052]

As described above, the ingrown nail correction tool according to the first aspect of the present invention is formed of a material having a superelastic effect which is memorized in a predetermined shape, and has a shape different from the memorized shape. It is deformed to be attached to the surface of the nail of the human body, and the stable elastic force that tries to restore the original shape that has been subjected to the memory process continues gently and acts as a correction force on the nail.

Therefore, the ingrown nail correction tool of the present invention combines a wide range of elastic deformation due to the superelastic effect with a repulsive force due to an appropriate elastic coefficient to maintain a stable correction force without increasing the thickness. Since it can always be applied to the nails, it exhibits stable and excellent straightening performance and is highly reliable.

As a material having a superelastic effect for forming the ingrown nail correction tool according to claim 1, Ni of the invention of claim 2 is used.
-By using a Ti-based alloy, it is possible to manufacture an ingrown nail correction tool that sufficiently exhibits a superelastic effect.

Furthermore, the inventions of claims 3 and 4 are, in the ingrown nail correction tool of claim 1 or claim 2, a material having a superelastic effect, such as a round wire or a square wire. By making a book or a plurality of linear bodies or in a tape state, it is possible to manufacture an ingrown nail correction tool that sufficiently exhibits a superelastic effect.

[Brief description of drawings]

FIG. 1A is a plan view showing a first embodiment of an ingrown nail correction tool of the present invention. (B) is a front view showing a first embodiment of the ingrown nail correction tool of the present invention.

FIG. 2 is a view showing a relationship between an ingrown nail correction tool and a toenail according to the same embodiment.

FIG. 3A is a plan view showing a state in which the ingrown nail correction tool according to the embodiment is adhered to the nail of the toe; (B) is FIG.
(A) Sectional drawing which follows the AA line.

FIG. 4A is a diagram showing an ingrown nail correction tool according to a second embodiment. 4B is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 5A is a diagram showing an ingrown nail correction tool according to a third embodiment. FIG. 6B is a view showing a state in which the ingrown nail correction tool of the embodiment is adhered to the nail of the toe.

FIG. 6A is a diagram showing a relationship between external force and elongation in metal. (B) is a diagram showing the relationship between external force and elongation in metal. (B) is a diagram showing the relationship between external force and elongation in metal.

FIG. 7 is a view showing a method for bending a usual metal and superelastic alloy.

8 is a diagram showing the results of the bending test shown in FIG.

FIG. 9 is a diagram showing symptoms of ingrown toenails in a toe.

FIG. 10A is a diagram showing symptoms of ingrown nails. (B) is a figure which shows the symptom of an ingrown nail.

FIG. 11 is a view showing a conventional ingrown nail correction tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Toe 2 ... Nail (ingrown nail) 2A ... Nail (normal nail) 2a ... Ingrown part 11 ... Test piece 12 ... Fixing tool 13 ... Stopper 21 ... Ingrown nail correction tool 22 ... Adhesive 31 ... Invagination Nail correction tool 32 ... Support 33 ... Presser body 41 ... Ingrown nail correction tool B ... Ingrown nail correction tool B ... Stick

Claims (4)

[Claims] 1. A device for correcting an invaginated part formed on a nail of a human body, which is formed of a material having a superelastic effect which is memorized in a predetermined shape, and is deformed into a shape different from the memorized shape. An ingrown nail correction tool that is attached to the surface of the nail of a human body. 2. A material having a superelastic effect is Ni-Ti.
The ingrown nail correction tool according to claim 1, wherein the ingrown nail correction tool is a system alloy. 3. The ingrown nail correction tool according to claim 1, wherein the material having a superelastic effect has a tape shape. 4. The ingrown nail correction tool according to claim 1 or 2, wherein the material having a superelastic effect is linear.