JPH0712363B2 - Special laser chip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a laser scalpel chip used for medical applications such as dental treatment.

[Prior Art] Conventional laser scalpels are used in medical-related applications in which a laser beam is introduced into the inside through a light guide or the like and converged by a lens to form a narrow beam to irradiate a tissue or the like of a biological disease to treat the tissue or the like. Although widely used, a method of irradiating a laser beam and performing a treatment in a state where the tip of the laser knife and the living tissue to be treated are not in contact with each other has been generally adopted. However, it is not possible to get a feel of the affected area during the operation, and there is a problem that the operation is difficult to perform, so that the affected area is brought into contact with the tip as disclosed in, for example, "Actual Publication No. Sho 60-190310". The method of carrying out treatment is adopted.

Further, as a so-called handpiece for joining a chip and a light guide, in order to further improve the operability, for example, “Saikai Sho-10-10” is used.
It has been proposed to employ a contra handpiece type in which the tip and the handpiece are joined at an angle as disclosed in Japanese Patent No. 0407).

[Problems to be Solved by the Invention] However, the laser knife tip of the above-mentioned conventional technique is, for example, relatively thin and bent because the tip itself is formed in a shape extending linearly in the longitudinal direction thereof. In the case of root canal treatment of such a tooth, it is not possible to sufficiently irradiate the laser beam up to the bent part, and it is impossible to effectively treat the target affected tissue, and in the case of the contra handpiece type, There is a problem that the apparatus becomes complicated because it is necessary to change the angle of the laser optical path using a reflecting mirror or the like in the handpiece.

The present invention is intended to solve the above problems of the prior art, and in particular, is a so-called "so-called 60-190310" in which a tip and a handpiece are linearly joined. It is extremely effective in the case of a straight handpiece type, and for example, to provide a contact type laser scalpel tip capable of irradiating a sufficient laser beam on a target affected tissue even during root canal treatment of teeth in the oral cavity. To aim.

[Means for Solving Problems] The present invention employs the following means in order to solve the problems.

That is, the present invention is a tapered laser scalpel chip that receives laser light emitted from a light guide and irradiates the laser light from the tip to a treatment site, etc., where the chip is a flexible amorphous polymer. Or composed of a copolymer,
The tip is a special laser knife tip that is formed in a curved shape from the beginning. And, preferably, the tip is curved so as to satisfy the following equation.

A + B <80mm, 60 ° <θ <150 ° Here, A and B are from both ends of the curved taper tip until the point where both tangents intersect when the tangents are drawn along the center line of the tip diameter. , Θ is the angle at which the two tangents intersect.

Hereinafter, the present invention will be specifically described.

The chip according to the present invention needs to be formed in a tapered shape and curved as shown in FIG. 1, for example. When the tangents 3a and 3b are drawn from the both ends 1a and 1b of the curved tapered tip 1 along the center line 2 of the tip diameter, the tangents 3a from the both ends 1a and 1b respectively , 3b intersects at an angle θ of 60 degrees to 150
It is preferably in the range of degrees. If it is smaller than 60 degrees or larger than 150 degrees, the operability may deteriorate. The length can be represented by the above formula. When the tangents 3a and 3b are drawn along the center line 2 of the tip diameter from both ends 1a and 1b of the curved tapered tip 1, the intersection points 3a and 3b 4
It is preferable that the sum of the respective distances A and B is less than 80 mm, and if it is greater than 80 mm, the operability in a narrow area is poor and sufficient laser irradiation cannot be performed, resulting in inability to perform satisfactory treatment.

Further, the conventional laser scalpel tip is usually composed of an inorganic material such as quartz or ceramics, but the tapered laser scalpel tip of the present invention is particularly a flexible amorphous polymer or copolymer. , An amorphous polymer or copolymer mainly composed of polymethylmethacrylate or polycarbonate.

The method for producing the curved tapered laser knife tip in the present invention is not particularly limited, and a known method can be applied. For example, when spinning a polymer or the like using a spinning machine,
The take-up roller speed is changed cyclically to make a take-up tapered fiber, which is then cut out and bent into a predetermined shape while heating, or after winding a fiber of uniform diameter at a constant speed once, Examples include a method of stretching while heating and then bending and cutting into a predetermined curved taper shape, or a method of molding a curved taper-shaped molded product in an injection molding machine or the like. A take-up method and a heat drawing method after spinning are preferable.

Further, the tapered laser scalpel tip in the present invention can be used not only as a single material but also as a so-called core-sheath multilayer composite structure, and the manufacturing method of the core-sheath multilayer composite structure is not particularly limited, and the composite spinning method is used. A known method such as a post-coating method can be applied.

Further, as the tapered shape, it is possible to include a non-tapered portion in one or more portions of the tip, and other than the conical tip 1 shown in FIG. 1 which is curved, for example, FIG. As shown in (b), the columnar portion 5a or 6a is connected to the conical portion 5b or 6b, and the columnar portion 5a or 6a is connected.
Alternatively, the laser light guided to the tip may be guided to the tip via the conical portions 5b and 6b. Either the tip 5 having the conical portion 5b having a curved shape or the tip 6 having the cylindrical portion 6a may be used. In addition, as shown in FIGS. 2C and 2D, the curved chips 7 and 8 are also configured to guide the laser light guided to the conical portions 7a and 8a to the cylindrical portions 7b and 8b. Good. Further, although not shown, a columnar portion, a conical portion, a columnar portion, or a chip having a three-stage structure including a conical portion, a cylindrical portion, and a conical portion may be used.

Further, even if the tip of the laser knife forms an arc surface, it does not matter at all.

Such a curved tip is used by being attached to a handpiece as shown in FIG. 3, for example. In FIG. 3, 1 is the chip 1 shown in FIG.
Is attached to the tip of the straight type handpiece 9.
The straight type handpiece 9 is connected to the handpiece body 11 via, for example, a detachable portion 10 that can be attached and detached with one touch, and a laser beam is introduced into the chip 1 via a light guide fiber 12 inserted into the body 11. Guided to the edge.

[Operation] In the special laser knife tip as described above, since the tapered tip itself is originally formed to be curved, even if the tip is attached to the straight type handpiece, the laser beam irradiation direction from the tip end Can be the laser light introduction direction or the direction bent with respect to the handpiece. Therefore, even during root canal treatment of teeth,
The tip can be easily inserted even into a curved deep treatment area, and the laser light can be accurately applied to the target area.

In addition, since the tip is composed of a flexible amorphous polymer pair or copolymer, it can easily follow the curvature of the root canal and does not damage the root canal and bends the deep treatment site. It is possible to guide the laser beam to the root canal treatment with an accurate laser. That is, if a tip is made of quartz or glass as in the past, it may not be possible to follow the curvature of the root canal, which may damage the root canal or guide the laser beam to the apex and perform accurate root canal treatment with laser. There is a possibility that there is no such problem, but the present invention solves such a problem. EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Example 1 Polymethylmethacrylate as a polymer (refractive index 1.49
When melt spinning was carried out in the usual manner at a temperature of 235 ° C using 1), the take-up roller speed was periodically changed to obtain take-up thick and thin fibers. Next, this thick and thin fiber was heated and curved, and a curved tapered laser knife tip having the following shape having a thin portion at one end was cut out.

<Curved taper laser scalpel tip> When a tangent line is drawn from both ends of a curved tapered tip along the center line of the tip diameter, the sum of the respective distances to the point where they intersect is 40 mm, and the tangent lines from both ends are The intersecting angle is 100 degrees, the tip has a small diameter of 400 μm, and the other end has a large diameter of 1000 μm.

Both ends of the tapered laser scalpel chip thus obtained were polished with 0.1 μm particle abrasives, and attached to the laser scalpel chip mounting part of the YAG laser generator (wavelength 1060 nm) with the small diameter side at the tip. . For specific evaluation of laser light irradiation, after opening the occlusal surface of the human extracted tooth with a drill and extracting the pulp, insert it into the root canal with the tapered tip attached to the fixture, and output 5 W Nd: YAG
Laser light is continuously irradiated for 10 seconds, and output is 12 W for 0.1 second, 0.
The properties of the tip and the properties of the inner surface of the root canal were observed at the time of intermittent irradiation for 10 seconds with a pulse of 1 second stop. The flexibility of this laser knife tip improved the operability, and it was easy to insert the tip into the details and bends.

It was found that the tip satisfying the requirements of the present invention is very effective for sterilization and drying, which are the most important sterilization in root canal treatment, with almost no deformation or melting of the tip and coagulation of pulp remaining in the root canal was observed. .

[Effects of the Invention] By using a tip having a curved taper shape in the present invention as a laser knife, it is possible to reduce the size of a thin and bent portion in a narrow place such as a root canal treatment in the oral cavity where effective treatment cannot be conventionally performed. Laser irradiation treatment can be effectively carried out while the tip of the tip is in contact with the affected area and the straight handpiece type is used.

Further, since the tip is made of a flexible amorphous polymer or copolymer, it is possible to easily follow the curvature of the root canal without damaging the root canal and perform more accurate treatment. be able to.

[Brief description of drawings]

FIG. 1 is a schematic side view of a special laser knife chip according to an embodiment of the present invention, and FIGS. 2A to 2D are schematic side views of a special laser knife chip according to another embodiment of the present invention. FIG. 3 is a side view of a handpiece showing one mode of use of the laser knife tip according to the present invention. 1, 5, 6, 7, 8 ... Laser knife tip 2 ... Tip diameter centerline 3a, 3b ... Tangent line 4 ... Tangent intersection 9 ... Straight type handpiece 10 ... Removable part 11 ... Handpiece Main body 12 …… Light guide fiber A, B …… Distance from tip end to tangent intersection 4 θ …… Angle where tangent intersects

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigemitsu Saito 1-1-1, Sonoyama, Otsu-shi, Shiga Toga Ltd. Shiga Plant (72) Heiroku Suganuma 1-1-1, Sonoyama, Shiga Prefecture Toray Co., Ltd. Shiga Plant (72) Inventor Kazuhiro Taguchi 2-2-1 Nihombashi Muromachi, Chuo-ku, Tokyo Toray Co., Ltd. Tokyo Plant (56) References: 62-201961 (JP, U)

Claims (1)

[Claims] 1. Receiving laser light emitted from a light guide,
In a tapered laser scalpel tip for irradiating a treatment site or the like with laser light from its tip, the tip is made of a flexible amorphous polymer or copolymer, and
A special laser knife tip, characterized in that the tip is formed in a curved shape.