JP2002165807A - Manual cutting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure smooth dental treatment activity by improving the stability and operability of a reamer and file and preventing the medical treatment accident in treatment using the reamer and the file. SOLUTION: The manual cutting appliance 10 comprises a cutting portion 20 and a clamping portion 30. The clamping portion 30 is so formed that respective cross sections are made into a nearly square shape. A recessed part is formed in the central portion and further the appliance has plural projecting parts on its flanks. Accordingly, the stability and operability in the treatment are improved and the medical treatment accident is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual cutting tool used by a dentist when, for example, cutting dentin (a yellow-white hard substance forming a tooth substrate) in dental treatment.

[0002]

2. Description of the Related Art Conventionally, when a root canal is formed in dental treatment, a manual cutting instrument or a mechanical cutting instrument has been used. These cutting tools are used by dentists to scrape dentin from teeth to enlarge the root canal or to scrape the scraped dentin.

FIG. 4 is a perspective view showing an example of the external configuration of a conventional manual cutting tool 50. As shown in FIG. This hand-cutting tool is shown in FIG.
As shown in the figure, the cutting part 60 is formed of, for example, stainless steel in a wire shape, and the grip part 70 is formed in a columnar shape with a circular cross section which is a hand-held part for the dentist to operate the cutting part. I have.

[0004]

However, in the conventional hand-cutting instrument 50 described above, since the grip 70 is formed in a columnar shape with a circular cross section, the dentist can hold the grip 70 to perform various operations. The stability when performing was not sufficient.
Therefore, the device 50 may drop into the patient's mouth due to slipping of the hand, and a medical accident such as the patient swallowing the device 50 may occur.

[0005] Further, since the grip 70 has a columnar shape with a circular cross section, it is possible to accurately grasp how much the tool 50 has been rotated during treatment using the hand-cutting tool 50. Not only was it difficult to adjust the force, but also it was difficult to adjust the force appropriately. For this reason, in treatment, the degree of rotation may be erroneously grasped, or the rotational force may be excessively applied.
May be rotated more than usual, and a medical accident may occur in which the cutting portion 60 is broken in the root canal of the patient.

The present invention solves the above-mentioned problems, improves stability and operability when using a cutting instrument, and prevents a medical accident at the time of treatment using a cutting instrument, so that a dental treatment can be smoothly performed. The purpose is to enable medical activities.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a cutting portion for cutting a predetermined portion in a mouth,
A gripping portion to which a cutting portion is attached, wherein the gripping portion is formed in a substantially columnar shape, and in a part or all of each cross section, a distance from the center of gravity of the cross section to the outer periphery. Are formed so as to have mutually different outer peripheral points (that is, formed in a columnar shape having a portion that is not circular in cross section). It is preferable that the grip portion has a shape including a portion having a substantially polygonal cross section, for example, a quadrangular shape. Note that the grip portion may have a shape including a portion having a cross-sectional area different from each other depending on a cutting position (for example, a shape in which the cross-sectional area near the center is reduced).

[0008] With the above configuration, the stability and operability when using the cutting tool can be improved,
Since a medical accident at the time of treatment using a cutting instrument can be prevented, a dental medical activity can be smoothly performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram illustrating a configuration example of a manual cutting instrument of the present example. As shown in FIG. 1, the manual cutting instrument 10 of the present example includes a cutting unit 20 and a grip unit 30. The hand cutting tool 10 is, for example, a reamer (Reame) generally used as a dental treatment tool.
r: hole expander), K files, H files, S files, triple files, etc.
le: cutting machine).

The cutting portion 20 is formed of a metal wire such as a steel wire or a stainless wire, and has a rod-like or needle-like elongated shape. The length of the cutting part 20 (the part from the tip part to the boundary with the grip part 30) exposed to the outside is set to a length (for example, about 25 [mm]) suitable for performing dental treatment, for example. Formed. Also,
The cutting portion 20 has a tapered shape that gradually becomes thinner toward the tip portion. In general, when dental treatment is performed, a plurality of hand-cutting tools having cutting portions of various lengths and thicknesses are used by being sequentially replaced at each stage in the treatment process. Therefore, the cutting portion 20 is formed to have a predetermined length and thickness according to the stage used in the treatment.

As shown in FIG. 1, the cutting section 20 has a blade formed by spirally bending a metal wire so that a root canal can be formed. . The blade of the cutting section 20 may have any shape, and may be formed by cutting a metal wire, for example, like an H file. In addition, the material of the cutting part 20 is not limited to metal. In addition, any shape may be used as long as it conforms to a target standard (for example, ISO standard).

The grip portion 30 is a hand-held portion for a dentist or the like to operate the cutting portion 20 during treatment, and is formed of, for example, a plastic such as a polycarbonate resin. Since the cutting tool for hand 10 is subjected to a high-temperature treatment by a sterilizer or the like, the material of the gripping portion 30 has, for example, a glass transition temperature higher than a predetermined value (for example, 130 ° C.) and a heat deformation temperature of, for example, a predetermined value (for example, (110 ° C.).

In the present embodiment, the grip section 30 is formed such that each cross section is substantially a quadrangle (including a regular quadrangle). As shown in FIG. 1, one end portion of the cutting unit 20 is attached to one of the end faces in the axial direction (the AA direction in FIG. 1). In addition, the gripper 30
The axial length is formed, for example, to a length (for example, about 10 [mm]) suitable for performing dental treatment.

Further, as shown in FIG.
In this example, the central portion is formed so as to be thinner than both end portions in the axial direction. That is, as shown in FIG. 1, the grip portion 30 has a shape having a depression at the center. Therefore, in this example, the grip section 30 has a relatively large cross-sectional area near both ends in the axial direction, as shown in FIG. 2A, and a cross-sectional area of the central portion shown in FIG. It is formed to be relatively narrow as shown. Also,
In this example, a plurality of convex portions are formed at predetermined intervals on the side surface of the grip portion 30 so as to be stably held. Thus, in this example, each cross section is approximately 4
The grip portion 30 is formed so as to be square, and a depression is provided in a central portion of the grip portion 30.
Since a plurality of convex portions are formed on the side surface of the dentist, the dentist can hold the device in a stable state when performing treatment, and can safely operate (treat) the device 10.

Next, the manufacturing process of the manual cutting instrument 10 will be described. First, a metal wire such as a stainless steel wire is spirally twisted by machining to form a portion serving as a blade for cutting dentin and the like, and a rod-shaped or needle-shaped cutting portion having the blade is formed. 20 are formed. Next, the cutting unit 20 is set in the resin molding die, and a polycarbonate resin heated to a high temperature is poured into the resin molding die (for example, high-speed injection). Then, in a state where one end of the cutting portion 20 is embedded in the resin, the grip portion 30 having a substantially quadrangular cross section of the present example is formed. Thus, the hand-cutting tool 10 is manufactured.

Next, an example of a method of using the hand-held cutting tool 10 of the present embodiment will be described. When a patient is treated using the hand-cutting tool 10 of the present example, the dentist holds the gripping portion 30 between the thumb and the index finger, holds the hand, and operates the hand-cutting tool 10. Then, operations such as root canal formation and dentin removal are performed by the cutting unit 20 which is interlocked with the gripping unit 30.

The method of using the manual cutting tool 10 includes, for example, a method called reaming mainly used when using a reamer and a method called filing mainly used when using an H file.
Reaming is performed by inserting the cutting portion 20 into the dental pulp cavity of the patient and then operating the grip portion 30 to continuously rotate the cutting portion 20 in the normal direction (the direction of BB ′ in FIG. 1) and to change the dentin. It is a method of shaving off. The filing is performed by inserting the cutting unit 20 into the pulp cavity of the patient and then operating the grip unit 30 to move the cutting unit 20 in the vertical direction (A-A direction in FIG. 1) to scrape dentin. Is the way.

For example, the method of using the hand-held cutting tool 10 includes a method called "turn and pull" and a method called "watch winding" mainly used when using a K file. The turn and pull is performed by inserting the cutting portion 20 into the dental pulp cavity of the patient and then operating the grip portion 30 to rotate the cutting portion 20 in the forward direction by about 1/4 turn to bite into the root canal wall. In this method, the dentin is scraped out by pulling out the cutting portion 20 as it is. Watch winding is performed by inserting the cutting unit 20 into the pulp cavity of the patient and then operating the grip unit 30 to move the cutting unit 20 in the forward direction by about 1/12 to 1/6.
It is a method of rotating and cutting into the root canal wall, and a method of scraping dentin by rotating the cutting portion 20 reversely by the same angle.

The dentist repeatedly operates the manual cutting tool 10 in the above-described manner to gradually remove or scrape dentin. In addition, depending on the condition of the affected part of the patient, it is replaced with another hand-cutting tool having a cutting part having a different thickness, and the hand-cutting tool replaced by the above-described method is repeatedly operated to further dentin. Perform the processing of scraping or scraping. By repeating such processing, the dentin existing in the affected part of the patient is removed.

As described above, the hand-cutting tool 10 can be replaced with a dental tool by various methods suitable for the shape of the hand-cutting tool 10 (for example, types of cutting portions having different cross-sectional shapes and dimensions such as reamers and H-files). When operated by a doctor, dental treatment is performed.

As described above, each section of the grip 30 is formed in a columnar shape having a substantially quadrangular shape so that a corner is formed in the grip 30, so that the dentist can use the hand-held cutting tool 10.
Can improve the stability when operating with
It is possible to prevent the manual cutting instrument 10 from sliding down. Therefore, a medical accident can be prevented.

Further, as described above, since the grip section 30 is formed in a columnar shape in which each cross section is substantially square,
For example, since the device 10 can be rotated based on a specific corner or side surface, it is possible to easily grasp how much the device 10 has been rotated and moved. For example, if one side in contact with the finger has moved from the initial state, it means that it has rotated 90 degrees. Therefore, it is possible to prevent the cutting portion 20 from being broken due to excessive rotation, and to prevent a medical accident.

Further, as described above, since each cross section of the grip portion 30 is formed in a columnar shape having a substantially quadrangular shape, two fingers (for example, an index finger and a thumb) for holding the grip portion 30 can be formed. The device 10 can be held in a stable state in contact with both opposing side surfaces of the grip portion 30. Therefore, even when the device 10 is rotated with a relatively strong force, it can be easily stopped at the intended position.
Therefore, root canal formation and the like can be performed safely and with a strong force without excessive rotation.

In the above-described embodiment, each of the cross sections of the grip portion 30 is formed in a columnar shape having a substantially quadrangular shape. However, each of the cross sections is formed of another polygon (for example, a triangle, (A pentagon, a hexagon, etc.). Even in such a case, it is possible to obtain substantially the same effect as in the case of forming the above-mentioned column having a substantially quadrangular cross section. FIG.
It is a perspective view which shows the example of an external appearance structure at the time of forming so that it may become a square shape. As shown in FIG.
Is a cutting part 20 formed in the same manner as the cutting part 20 described above.
A and a grip portion 30A formed in a column shape having a substantially triangular cross section. In this case, the dentist using the instrument 10A, for example, contacts the thumb with one of the three outer surfaces of the grip portion 30A, and forms a mountain formed at the boundary between the other two surfaces. What is necessary is just to hold the holding | grip part 30A in a hand by making an index finger contact the part which exists.

Further, if the grip portion is configured to have a different shape according to the type of the cutting tool, it is possible to judge which type of cutting tool is used at a glance at the time of use, and to use the tool for treatment. Can be prevented from being confused. In this case, for example, the reamer has a gripper having a substantially triangular cross section (approximately a triangular column in appearance), and the K file has a gripper having a substantially quadrangular cross section (approximately a quadrangular column). ).
It should be noted that although the same type of reamer may have a different thickness of the cutting portion depending on the stage of treatment, the shape of the grip portion may be made different depending on the difference.

In the above-described embodiment, the grip portion 30 has a shape having a depression in the center.
The shape and number of the depressions are not limited to those shown in FIG. Also,
Each side surface may be formed so as to be flat without having a depression.

Further, in the above-described embodiment, the cross section of the grip portion 30 is formed so as to have a substantially quadrangular shape. However, all the cross sections of the grip portion 30 have a substantially quadrangular shape. It may not be necessary, and a part of the cross section may have another shape. Furthermore, if the stability of operation at the time of treatment can be obtained (for example, when the dentist has a hook such as a corner or unevenness when holding it), the cross section is from the center of gravity to the outer periphery. The grip portion 30 may be formed in various shapes such as a shape (for example, a star shape or an elliptical shape) having outer peripheral points having different distances from each other.

Further, in the above-described embodiment, the grip portion 30 is formed into a substantially quadrangular prism or a triangular prism shape. However, the outer shape of the grip portion is formed by using an adapter (cap) that covers the grip portion. It may have a quadrangular prism shape or the like. If the inner wall side of the adapter is made of an elastic material such as silicone rubber, even if the adapter is placed on a cylindrical grip, the grip can be pressed against the adapter. It can be set to a substantially normal state in which idling is prevented. Therefore, the same effects as those of the various examples described above can be obtained only by covering the conventional product with the adapter. In the case of forming an adapter to cover the grip portions 30, 30A, etc. in each of the above-described embodiments, the shape of the inner wall side is changed to the grip portion 3.
By adopting a shape conforming to the shape of the outer wall, such as 0, 30A, the adapter can be easily set and can be used without any hindrance (no hindrance such as idling). As described above, if the grips 30, 30A and the like in the above-described embodiments are configured to cover the adapter,
The thickness of the grip portion can be adjusted, and the operability can be improved. More specifically, by placing the adapter on the grips 30, 30A, etc., the thickness of the grips can be adjusted to adjust the magnitude of the torque applied to the cutting instrument. This makes it possible to easily change the grip portion to a convenient grip portion.

Furthermore, in the above-described embodiment, the grip portion 30 is formed of a heat-resistant plastic such as polycarbonate. However, as the heat-resistant plastic, for example, polysulfone, polypropylene, U-polymer, polyetherimide, Other resins such as ether sulfone, polyamide imide, and econol may be used. Further, the grip portion 30 may be formed of a material other than plastic.

[0030]

As described above, according to the present invention, there is provided a hand-cutting tool including a cutting portion for cutting a predetermined portion in a mouth and a grip portion to which the cutting portion is attached, wherein the grip portion is substantially formed. Since it is formed in a columnar shape, and in a part or the whole of each cross section, the distance from the center of gravity of the cross section to the outer circumference is formed so as to have outer peripheral points different from each other, so that the dentist It is possible to improve the stability when operating with the hand-held cutting instrument, and it is possible to prevent the hand-cutting instrument from sliding down during treatment. Further, there is an effect that it is possible to easily grasp how much the instrument has been rotated and moved. Therefore, a medical accident can be prevented, and a dental medical activity can be smoothly performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an external configuration of a manual cutting instrument according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view showing a cross section near both ends in the axial direction of a gripping portion. FIG. 2B is a cross-sectional view illustrating a cross section of a central portion of the grip portion.

FIG. 3 is a perspective view showing an example of an external configuration of a manual cutting instrument according to another embodiment of the present invention.

FIG. 4 is a perspective view showing an example of an external configuration of a conventional manual cutting instrument.

[Explanation of symbols]

 10,10A Hand cutting tool 20,20A Cutting part 30,30A Grip part

Claims (3)

[Claims] 1. A hand-cutting tool including a cutting portion for cutting a predetermined portion of a mouth, and a grip portion to which the cutting portion is attached, wherein the grip portion is formed substantially in a columnar shape and has a cross section. A hand-cutting tool characterized in that a part or all of the surface is formed so that the distance from the center of gravity of the cross section to the outer periphery has different outer peripheral points. 2. The hand-cutting tool according to claim 1, wherein the grip portion has a shape including a portion having a substantially polygonal cross section. 3. The hand-held cutting tool according to claim 1, wherein the grip portion has a shape including a portion having a different cross-sectional area in a cross section depending on a cutting position.