JPS63200750A - Special laser knife chip - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

[Prior art] Conventional laser scalpels are used for medical purposes in which a laser beam is introduced into the interior through a light guide, etc., and is converged by a lens to form a narrow beam that is irradiated onto diseased tissue in a living body to treat the tissue. Although it is widely used, a method has generally been adopted in which the tip at the tip of a laser scalpel and the biological tissue to be treated are irradiated with laser light in a non-contact state. However, there is a problem that it is difficult to perform the treatment because it is not possible to feel the affected area during the treatment.
A method is adopted in which treatment is performed by bringing the affected area into contact with the above-mentioned chip, as disclosed in 2008 Publication.

In addition, in order to improve operability, a so-called handpiece for joining a chip and a light guide is used, for example, in the
It has been proposed to adopt a contra hand piece type disclosed in Japanese Patent No. 100407, in which a tip and a hand piece are joined at a certain angle.

[Problems to be Solved by the Invention] However, in the laser scalpel tip of the above-mentioned prior art, the tip itself is formed in a shape that extends linearly in its longitudinal direction, so it is, for example, relatively thin and curved. When performing root canal treatment on a tooth that is difficult to reach, the laser beam cannot be irradiated sufficiently to the bent area, making it impossible to effectively treat the target affected tissue. Since it is necessary to change the angle of the laser beam path using a reflector or the like within the handpiece, there is a problem in that the device becomes complicated.

The present invention aims to solve the problems of the prior art, and is particularly directed to the so-called so-called handpiece in which a tip and a handpiece are linearly joined, as disclosed in "Kokai No. 190310/1983". It is an object of the present invention to provide a contact type laser scalpel tip that is extremely effective in the case of a straight handpiece type and is capable of irradiating sufficient laser light to the target affected tissue, for example, during root canal treatment of a tooth in the oral cavity. purpose.

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

That is, the present invention provides a tapered laser scalpel tip that receives laser light emitted from a light guide and irradiates a treatment area, etc. from its tip, with a special tapered laser scalpel tip in which the tip is originally formed into a curved shape. It is characterized by being a laser scalpel chip. Preferably, the tip is curved so as to satisfy the following equation.

A + 8 < 80711111° 60 degrees θ < 150 degrees Here, A and B are respectively from both ends of the tip to the point where both tangent lines intersect when tangent lines are drawn along the center line of the tip diameter at both ends of the curved tapered tip. , and θ is the angle at which both the tangents intersect.

The present invention will be explained in detail below.

The tip in the present invention needs to be tapered and curved, as shown in FIG. 1, for example. The degree of curvature of the tip 1 is determined by drawing tangent lines 3a and 3b from both ends 1a and 1b of the curved tapered tip 1 along the center line 2 of the tip diameter.
It is preferable that the angle θ at which the respective tangents 3a13b from a and 1b intersect is in the range of 60 degrees to 150 degrees.

If the angle is smaller than 60 degrees or larger than 150 degrees, the operability may deteriorate. The length of the curved tapered tip 1 can be expressed by the above formula at both ends 1a, 1.
When tangent lines 3a and 3b are drawn from b along the chip diameter center line 2, the sum of the respective distances A1B to the point 4 where both 3a and 3b intersect is preferably smaller than 80M, and if larger than 80rra, it is narrow. There is a risk that the operability at the site is poor and sufficient laser irradiation cannot be performed, making it impossible to provide satisfactory treatment.

In addition, the constituent material of the tapered laser scalpel tip in the present invention is not particularly limited, and may be any inorganic material such as quartz or ceramic, but non-quality polymers mainly composed of polymethyl methacrylate and polycarbonate, and Copolymers and the like are more effective in terms of flexibility.

The method for manufacturing the curved tapered laser scalpel tip in the present invention is not particularly limited, and any known method can be applied. In other words, in the case of inorganic materials, wire drawing and sintering methods are used, and in the case of polymers, for example, when spinning the polymer etc. using a spinning machine, the speed of the take-up roller is periodically changed. A method is to create a drawn tapered fiber, then cut it out, and curve it into a predetermined shape while heating, or to wind up a fiber with a uniform diameter at a constant speed, stretch it while heating at a predetermined position, and then create a predetermined curved taper. Examples include a method of bending and cutting into a shape, or a method of forming a curved tapered molded body using an injection molding machine, etc. However, from the viewpoint of flexibility, variable speed pulling method during spinning and heating stretching method after spinning are methods. preferable.

In addition, the tapered laser scalpel tip of 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 for the core-sheath multilayer composite structure is not particularly limited, and composite spinning method can be used. , a post-coating method, and other known methods can be applied.

In addition, the tapered shape can include a non-tapered portion at one or more portions of the chip, and in addition to curved conical chip 1 shown in FIG. 1, for example, as shown in FIG. As shown in FIG.
, 6b to the tip thereof. The chip 5 may have a curved shape with a conical portion 5b, or the chip 6 may have a curved shape with a cylindrical portion 6a. Also, Figure 2 (c)
As shown in (d), a curved chip 7.8 may be used so that the laser beam guided to the conical portions 7a, 8a is guided to the cylindrical portions 7b, 8b. Furthermore, although not shown in the drawings, the chip may have a cylindrical portion, a conical portion, a cylindrical portion, or a three-stage structure including a conical portion, a cylindrical portion, and a conical portion.

Further, there is no problem even if the tip of the laser scalpel forms an arcuate surface.

Such a curved tip is used, for example, by being attached to a handpiece as shown in FIG. In FIG. 3, 1 is the chip 1 shown in FIG.
is attached to the tip of the straight hand piece 9.

The straight type handpiece 9 is connected to a handpiece main body 11 via a detachable part 10 that can be detached with one touch, for example, and the light guide fiber 1 inserted through the main body 11 is
2, the laser beam is guided to the laser beam introduction end of the chip 1.

[Function] In the special laser scalpel tip as mentioned above, the tapered tip itself is originally curved, so even if it is attached to a straight type handpiece, the laser beam irradiation from the tip end will not work. The direction can be a laser beam introduction direction or a direction bent with respect to the handpiece. Therefore, even during root canal treatment of a tooth, the chip can be easily inserted into a curved and deep treatment site, and the laser beam can be accurately irradiated to the target site.

[Example] Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 Polymethyl methacrylate (refractive index 1.
491) at a temperature of 235° C., the speed of the take-off roller is periodically changed to create thick and thin I! Ii [obtained. Next, this thick and thin fiber was heated and curved, and a curved tapered laser female tap having the following shape having a thin portion at one end was cut out.

<Curved tapered laser scalpel tip> When tangent lines are drawn from both ends of the curved tapered tip along the tip diameter center line, the sum of the respective distances to the point where the two intersect is 40 m, and each tangent line from both ends is The intersecting angle is 100 [, the small diameter of the tip is 400μ, and the large diameter of the end is 1000μ.

Both ends of the tapered laser scalpel tip obtained in this way were polished with an abrasive of 0.1 μm particles, and the laser scalpel tip of the YAG laser generator (wavelength 1060 nm) was installed so that the small diameter side was the tip. I installed it. For specific evaluation of laser light irradiation, the occlusal surface of a human corporate tooth is opened with a drill, the pulp is removed, and the tapered tip is inserted into the root canal with the fixing device attached.
Continuous irradiation with 5W output Nd:YAG laser light for 10 seconds,
In addition, the properties of the chip and the properties of the inner surface of the root canal were observed during intermittent irradiation for 10 seconds with a pulse of 12W output for 0.1 seconds and a stop of 0.1 seconds. The flexibility of this laser scalpel tip improved its operability, and it was also easy to insert the tip into small areas and bends.

The chip that meets the requirements of the present invention has almost no deformation or melting of the chip, and coagulation of the pulp remaining in the root canal was observed, indicating that it is extremely effective for sterilization and drying, which are the most important tasks in root canal treatment. .

[Effects of the Invention] By using the tip having a curved taper shape according to the present invention as a laser scalpel, it is possible to treat narrow and curved areas in narrow places such as root canal treatment in the oral cavity where effective treatment could not be performed conventionally. Laser irradiation treatment can be effectively performed even when the tip of the tip is in contact with the affected area and a straight handpiece type is used.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a special laser scalpel chip according to one embodiment of the present invention, FIG. 2 (a) or 2) is a schematic side view of a special laser scalpel 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 scalpel tip according to the present invention. 1.5.6.7.8... Laser scalpel tip 2...
......Chip diameter center lines 3a, 3b...Tangent line 4...Intersection point of tangent lines 9...
...Straight type handpiece 10...
......Detachable part 11... Handpiece body 12.
......Light guiding fibers A, B...
...Distance θ from the tip of the chip to the intersection point 4 of the tangents...Angle where the tangents intersect Patent applicant Morita Manufacturing Co., Ltd. Same as above Toshi Co., Ltd. Figure 2

Claims (1)

[Claims] (1) A special laser in a tapered laser scalpel tip that receives laser light emitted from a light guide and irradiates the laser light from the tip to a treatment area, etc., characterized in that the tip is formed into a curved shape. Female tip.