JP2869864B2 - Laser treatment device for living tissue - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a laser treatment apparatus for living tissue. In particular, the present invention is applied to the modification of a tissue by irradiating a laser beam to a surface portion of a living tissue, for example, removing nevus and the like.

[0002]

2. Description of the Related Art Nevi are melamine pigments deposited on skin tissue. In removing the nevus, conventionally, a method of applying hydrogen peroxide to the nevus portion on the skin surface and chemically peeling the nevi, and a method of physically removing the nevi by sandpaper are known. Then, a method of irradiating a laser beam to evaporate the tissue of the nevus part is known.

However, it is extremely difficult to completely remove nevus by these methods. Although the method of irradiating laser light to remove nevus is paid attention to its potential, as shown in FIG. 11, when irradiating laser light L onto the surface of tissue M, The ratio of scattered laser light is large, and a large output is required. In addition, the ratio of the laser light incident on the tissue to be scattered inside the tissue is large, and the damage of the tissue other than the target tissue portion is increased. Furthermore, the intensity distribution of the laser light shows a temperature distribution where the axial center part of the optical fiber is high and the peripheral part is low,
Evaporation of uniform tissue cannot be achieved. On the other hand, since the location of the laser beam irradiation can be specified only by visually observing the laser beam, laser beam irradiation remains in a target area.

Accordingly, the present inventor has previously filed application no.
No. 625,313, in order to uniformly and efficiently irradiate a target tissue portion with a laser beam, a liquid containing a laser beam-absorbing powder having a particle size of 40 μm or less and this dispersion medium is used. As a target, a laser treatment system for living tissue has been proposed which includes a step of coating the surface of the living tissue with a film thickness of 40 μm or less, and a step of irradiating a laser beam, preferably a pulsed laser beam, to the applied region.

In this laser treatment system, a liquid in which a laser-absorbing powder is dispersed in a dispersion medium,
Preferably, a laser light-absorbing powder having a particle size of 40 μm or less dispersed in water and alcohol is applied as a target T on the surface of the tissue M as shown in FIG.

[0006] The target T is applied to a target tissue M, for example, a nevus portion substantially by using a felt pen or the like. The laser light from the laser light generator is projected onto the coated target T from the tip while passing through an optical fiber.

The laser light projected on the target T is absorbed by the laser light-absorbing powder contained in the target T and becomes thermal energy. As a result, the entire portion irradiated with the laser beam is instantaneously heated to a high temperature (for example, 800 to 1800 ° C.).
And transpiration of the tissue takes place. As a result, as shown in FIG. 6, the laser light irradiation location R can see the ground of the skin, while the target T itself exhibits, for example, black at the non-irradiation location. It is determined that the part is a part, and the part can be irradiated with laser light in the next stage (see FIG. 7). This is extremely effective in that the operator can easily irradiate the entire target area with laser light.

[0008]

However, the diameter of the unit irradiation point R is extremely small, about 3 mm, and it is extremely difficult to irradiate a small unirradiated part of the laser beam adjacent thereto with visual confirmation. In addition, there is also a problem that the operator becomes a heavy burden, and as a result, some unirradiated portions are left.

[0009] Therefore, an object of the present invention is to reduce the burden on the operator by irradiating a laser beam to an unirradiated portion without relying on visual observation and irradiating the unirradiated portion with laser light. It is in.

[0010]

According to the present invention, there is provided a target coated with a coating liquid in which a colored absorbing powder that absorbs laser light and generates heat is dispersed in a dispersion medium on the surface of a living tissue. In response, a device for irradiating a laser beam to modify the surface portion of the tissue includes a laser beam generator, and a laser beam from the laser beam generator, and a pulse is applied to a certain area range with respect to the target surface. Laser light transmitting means for irradiating laser light, laser light switching means provided between the laser light generating device and the laser light transmitting means, and pulse laser light emitted from the laser light transmitting means First light amount detecting means for detecting the amount of reflected light reflected at the center of the irradiation area; and a second light amount detecting means for detecting the amount of reflected light of the pulse laser light in a wider area including the center of the irradiation area. The ratio a light quantity detecting means, and a second light intensity Im detected by the second light quantity detecting means, a first light quantity Ir detected by the first light quantity detecting means (Im / Ir)
The laser light from the laser light generator is incident on the laser light transmitting means by operating the switching means at the time when laser light irradiation is necessary, as a determination index of the presence or absence of unirradiated parts or the need for re-irradiation. Irradiation control means for causing
And a laser treatment apparatus for living tissue provided with:

[0011]

According to the present invention, there is provided an apparatus for irradiating a living tissue with a laser beam to modify the surface of the tissue, comprising: a laser beam generating apparatus; Laser light transmitting means for receiving laser light and irradiating the surface of the tissue with laser light, laser light switching means provided between the laser light generating device and the laser light transmitting means, First light amount detecting means for detecting the amount of reflected light of the laser light emitted from the laser light transmitting means reflected from the tissue surface, and detecting the amount of reflected light of the laser light in a specified region of the tissue surface And the ratio (Im / Ir) of the second light quantity Im detected by the second light quantity detection means to the first light quantity Ir detected by the first light quantity detection means. There is an irradiation place Irradiation control means for operating the switching means at the time when laser light irradiation is necessary and causing laser light from the laser light generation device to be incident on the laser light transmission means, A laser treatment apparatus for living tissue provided with the same.

Further, a laser beam is applied to a target on which a coating solution in which a colored absorbing powder that absorbs laser light and generates heat is dispersed in a dispersion medium is applied onto the surface of a living tissue to irradiate the target with laser light. In a device for modifying the surface portion of, a laser light generating device, and a main optical fiber that receives a laser beam from the laser light generating device and irradiates a pulse laser light to a certain area range with respect to the target surface, A plurality of bundled optical fibers arranged annularly around the main optical fiber, each end face of which faces the target surface, a switching means for laser light provided between the laser light generator and the main optical fiber, Pulsed laser light emitted from the tip of the main optical fiber is reflected at the center of the irradiation area, enters the main optical fiber, and is reflected light emitted from the end face thereafter. Second detecting a first light amount detecting means for detecting the amount of light, the amount of reflected light emitted from the rear end face receiving in each bundle fiber pulse laser light in the wider region including the central portion of the irradiation region
And the ratio (Im / Ir) of the second light quantity Im detected by the second light quantity detection means to the first light quantity Ir detected by the first light quantity detection means, As a determination index of the presence or absence or the need for re-irradiation, irradiation control means for operating the switching means at the time when laser light irradiation is necessary to cause the laser light from the laser light generator to enter the laser light transmission means, Also provided is a laser treatment apparatus for living tissue provided with:

A first laser light switching means is provided on the side of the laser light generator, and a second laser light switching means is provided on the side of the laser light generator, between the laser light generator and the laser light transmitting means. The first laser light switching means can be configured to open and close in conjunction with an operator's foot switch, and the second laser light switching means can be configured to be opened and closed by the irradiation control means.

[0014] A condensing lens for condensing the reflected light of the laser beam on the bundle optical fiber can be provided on the tip side of the bundle optical fiber.

A through hole is formed in the center of the condenser lens, and the tip of the main optical fiber can be inserted into the through hole.

The main optical fiber and the bundle optical fiber can be fixed to a holder held by an operator.

[0017] The main optical fiber can be movably held by a holder so that the distance from the tissue surface can be adjusted.

[0018] The main optical fiber and the bundle optical fiber can be fixed to a holder, and the holder can be held on an XY table that moves on a plane parallel to the tissue surface.

The advantage of the present invention is that when a target having a liquid having a thickness of 40 μm or less coated with a liquid having a laser light-absorbing powder having a particle size of 40 μm or less and a dispersion medium on the tissue surface is provided. Appears noticeably.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention will be specifically described below with reference to the drawings, taking an example in which a nevus for a skin as a tissue M is removed.

In the present invention, as shown in FIGS. 1 and 2, a connector 12 is connected to the tip of a handpiece 10 (only the tip is shown in FIG. 1) which is held by an operator with a screw. A distance holding terminal 14 is connected to the distal end of the connector 12 with a screw. Handpiece 10, connector 12 and distance-holding terminal 14
Constitutes the holder of the present invention.

The leading ends of the main optical fiber 16 and the bundle optical fibers 18, 18,... Are inserted into the through holes 12A of the connector 12. The tip of the main optical fiber 16 has its cladding peeled off, exposing the core 16a. A notch 12 </ b> B is formed on the base side of the connector 12. The exposed core 16a faces the notch 12B.

As shown in FIG. 4, the bundle optical fibers 18, 18,... Are arranged in a ring around the main optical fiber 16, and the bundle optical fibers 18, 1,.
8 are provided around the through holes 12A.
It is installed in.

The main optical fiber 16 is optically coupled to a laser light generator 22, as shown in FIG. As the laser light generator 22, a device that generates pulsed laser light is preferably used.

On the other hand, as shown in FIG. 1, a cooling gas G such as clean air or carbon dioxide gas is supplied from a gas pressure supply source 24 into the handpiece 10, and this gas G
Passes through the notch 12B and the inner surface of the through hole 12A and the core 1
After passing through the gap with the outer surface of 6a, it passes through the guide path 12C of the connector 12 and is sprayed on the target tissue M. The blowing of the gas is mainly performed to remove the heat generated by the irradiation of the laser beam L to alleviate the burden on the patient and to remove flying objects.

The tip terminal 14 is for maintaining the distance between the emission end of the laser light L of the main optical fiber 16 and the surface of the tissue M, and has a separation distance of, for example, about 3 to 5 mm.

Further, in order for the operator to slide the front terminal 14 against the surface of the tissue M and move it to the next position, the distal end of the metal front terminal 14 has a circular cross section and an arc-shaped planar shape. For example, a contact guide 14A made of, for example, plastic and having excellent slipperiness is integrated.

Further, the terminal 14 has an opening 14a for the purpose of letting the gas escape to the outside and for confirming the irradiation position of the laser beam.

On the other hand, as shown in FIG. 3, the laser beam from the laser beam generator 22 is
After passing through the second laser light switch 28, the light is incident on the rear end of the main optical fiber 18 by the incident lens 30.
The laser light L passes through the main optical fiber 18 and is projected onto the surface of the tissue M from the distal end surface.

In this case, it is desirable that the target T be applied to the surface of the tissue M. The target T is a liquid in which a laser light-absorbing powder is dispersed in a dispersion medium. Preferably, the target has a particle size of 40 μm.
m or less laser light-absorbing powder dispersed in water and alcohol.

The target T is applied, for example, with a felt pen or the like so as to substantially coincide with a target tissue M, for example, a nevus portion. The laser beam L is projected from the tip surface of the coated target T portion while passing through the main optical fiber 16.

The laser light L projected on the target T is
It is absorbed by the laser light-absorbing powder contained in the target T and becomes thermal energy. As a result, the entire irradiated portion of the laser beam L is instantaneously heated to a high temperature (for example, 800 to 1800).
° C), and the tissue evaporates. If the one-time evaporation of the tissue is not sufficient, the target T is applied again, and then the laser light is irradiated. The number of repetitions of the application of the target and the irradiation of the laser beam L can be appropriately selected.

Further, since the surgeon needs to perform the laser irradiation treatment while observing the manner in which the target T is irradiated with the laser beam L, the opening 14a is positioned so that the opening 14a is positioned on the viewpoint side of the operator. An O-ring 21 is provided between the base end of the terminal 14 and the flange of the connector 12. The O-ring 21 stably fixes the front terminal 14 to the connector 12 at a stage where the position of the front terminal 14 around the axis is adjusted.

The target has a particle size of 40 μm.
The following absorptive powder of laser light is used, and a more preferred particle size is 10 μm or less. If the particle size is large, it is difficult to disperse well in the dispersion medium, the film thickness when applied to the tissue surface becomes large, and the smoothness of the film surface is disturbed, and the tissue becomes uneven when irradiated with laser light. Transpiration. The raw material can be ground to obtain the desired particle size.

As the dispersion medium, water, particularly sterile water, can be used. It is desirable to add more alcohol. As the alcohol, methyl alcohol, ethyl alcohol, propyl alcohol, and butyl alcohol can be suitably used. By containing the alcohol, when the target is irradiated with the laser beam, the alcohol evaporates, and at that time, the latent heat of evaporation is deprived and the target can be dried at an early stage. In order to enhance the dispersibility at the time of dispersing, a surfactant such as an anionic, nonionic or cationic surfactant can be added, and soaps, for example, medicated soaps can also be pulverized and added. Surfactants or soaps have the effect that when a liquid target is applied to tissue, it can be applied as a uniform film without repelling.

The laser light absorbing powder is not limited as long as it absorbs laser light and generates heat. Examples of the powder include carbon, manganese dioxide and iron oxide. These can be mixed and used in combination. Since this type is colored, there is an advantage that when applying the target to the tissue surface, it is possible to visually apply the target to a target location, and there is also an advantage that the laser light irradiation location can be confirmed on the target. .

That is, as shown in FIGS. 1 and 5,
When the target T is applied to the entire target area of the tissue and the entire target T is irradiated with the laser beam, as shown in FIGS. On the other hand, at the unirradiated portion, the target T itself exhibits, for example, a black color. Therefore, it is determined that the black portion is the unirradiated portion, and as shown in FIG. Irradiation can be performed. This is extremely effective in that the operator can easily irradiate the entire target area with laser light.

The liquid target is composed of the laser light-absorbing powder 1 with alcohol of 0.5 to 10 and water of 3 to
25. The viscosity of the liquid target can be 2 to 200 CPS (20 ° C.). Usually, it is desirable to have a viscosity of about the same as milk to ensure uniformity of the film.

As the laser light, it is preferable to use Nd: YAG laser light or semiconductor laser light, rather than using carbon dioxide gas laser light. The laser light preferably includes a pulsed laser light, and the pulse interval can be set to 5 to 50 PPS at 10 to 500 mJ.

On the other hand, the irradiation point R is the main optical fiber 18
Although it depends on the diameter of the distal end surface and the distance between the distal end surface and the surface of the tissue M, the diameter is usually 1 to 5 mm. For this reason, the unirradiated portions surrounded by the irradiated portions R and R shown in FIGS. 6 and 8 are extremely small, and are difficult to visually check.
Even if it can be visually recognized, setting the position of the distal end face of the main optical fiber 18 at that location places a great burden on the operator.

Therefore, in the present invention, there is mainly provided means for optically determining the presence or absence of the target T, or the ratio of the target T in a specific area.

That is, as shown in FIGS. 1 and 3, a condenser lens 32 is provided on the tip side of the baldle optical fibers 18, 18,..., And the laser light reflected on the specified region of the surface of the tissue M is reflected. While condensing, the light is made to enter each of the bundled optical fibers 18, 18..., And then the reflected light emitted from the end face is passed through the converging lens 34 to the second
A second light amount detecting means for detecting the reflected light amount by making the light amount incident on the light amount measuring photocell 36 is constituted.

On the other hand, the laser light reflected on the surface of the tissue M also enters the main optical fiber 18.

Then, the visible light is extracted from the components of the reflected light by a half mirror 38 which transmits the reflected light that enters the main optical fiber 18 and exits from the end face thereof and reflects the visible light, and converges the convergent lens 40. Through the first light quantity measuring photocell 42 to constitute a first light quantity detecting means for detecting the reflected light quantity.

Under such a configuration, the ratio (Im / Ir) of the second light quantity Im detected by the second light quantity detection means to the first light quantity Ir detected by the first light quantity detection means is not determined. The comparison is made by the comparator 44 as a judgment index of the presence or absence of the irradiation place or the necessity of the re-irradiation. When the laser light irradiation is necessary, the second laser light switch 28 is operated by the irradiation control means 46. (As open) laser light generator 22
From the main optical fiber 16. The first laser light switch 26 is opened by the operation of the foot switch 48 which is operated when the operation is started or restarted after the middle stage. Even if the first laser light switch 26 is opened by the operation of the foot switch 48, since the second laser light switch 28 is still closed, the laser light does not enter the main optical fiber 16, and the reflected light amount The second laser light switch 28 is opened only when the ratio (Im / Ir) is under a specific condition.

In the example of the present invention, as shown in FIG.
On the surface of the tissue M, the position of the main optical fiber 16 is adjusted so that the irradiation area of the main optical fiber 16 is larger than the target tissue area condensed by the condenser lens 32, and the distance from the surface of the tissue M is selected. Therefore, the first light amount Ir obtained through the main optical fiber 16 and detected by the first light amount detecting means 42 and the bundle fibers 18 and 1
8 and the second light quantity Im detected by the second light quantity detection means 36 are as follows.

That is, at a certain point in time, when the target T is present in the entire irradiation area of the laser beam and when there is no target T, Im ≒ Ir is satisfied.
For example, when there is an unirradiated area as shown in FIGS. 3 and 8, since Im <Ir, the ratio of the reflected light amounts (Im /
Ir) is smaller than 1.0. Therefore, Im / Ir <
When the condition of 1.0 is satisfied, the laser beam can be irradiated by opening the second laser light switch 28. However, the laser beam may be excessively irradiated.
An appropriate laser light irradiation condition value F within a range of 1.0 is determined in advance, and when the condition of (Im / Ir) <F is satisfied, the second laser light switch 28 is opened to irradiate the laser light. It is desirable to carry out.

Thus, after grasping the handpiece 10, the operator turns on the foot switch 48 and moves the tip of the handpiece 10 while tracing the target T-applied portion on the tissue surface. Thereby, (Im / Ir)
When the condition of <F is satisfied, the second laser light switch 28 is opened, and irradiation of laser light is performed. If necessary, when the target area is irradiated with the laser light again, the laser light is applied to the unirradiated portion in the first laser light irradiation. The second irradiation part is shown as a symbol R2 in FIG. In this way, the occurrence of unirradiated portions is prevented.

In this example, the operator moves the handpiece 10 while grasping it.
Can be automated in the mode shown in FIG. That is, the holder 5 holding the main optical fiber 16 and the bundle optical fibers 18, 18,...
0 is held in a Z-direction by a Z-direction drive motor 54 so as to be freely movable in the X-direction along an X-direction guide 56 by an X-direction drive motor 58. To the Y-direction drive motor 60
This makes it movable in the Y direction.

The exercise device of the mechanism having such an XY table is opposed to the tissue surface of the patient, and the holder 50 is moved.
Can be scanned, for example, as shown in FIG. When the irradiation area of the target is narrow, the tissue surface is substantially flat, and it is not necessary to move the holder 50 in the Z direction.

In the above example, the removal of the nevus of the skin has been described as an example. However, the present invention can be applied not only to decolorization and wrinkling of tattoo but also to treatment of hair loss and athlete's foot. In the field of dentistry, it is also possible to apply a target to the surface of the tooth tissue and remove the portion.

On the other hand, in the present invention, it is not essential that the target is previously applied to the tissue surface. In the removal of the nevus, the nevus part is darker than other parts, so that the difference between Im and Ir can be clearly detected,
The present invention can be applied as it is. However, it is desirable to apply a target in order to prevent the scattering shown in FIG.

[0053]

As described above, according to the present invention, an unirradiated portion is determined optically without relying on visual observation, and the unirradiated portion is irradiated with a laser beam, thereby making it possible for the operator. The burden can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of an example of a laser beam irradiation apparatus according to the present invention.

FIG. 2 is a front view of the connector.

FIG. 3 is an explanatory diagram illustrating only an optical system of a laser light irradiation apparatus according to the present invention;

FIG. 4 is a view taken along line VI-VI in FIG. 3;

FIG. 5 is a schematic view of a coating state of a target.

FIG. 6 is a schematic diagram of a first irradiation state of laser light.

FIG. 7 is a schematic diagram of a second laser light irradiation state.

FIG. 8 is an explanatory diagram showing a relationship between a target application region and a laser light irradiation region.

FIG. 9 is an explanatory diagram showing a relationship between a target application region and a laser light irradiation region when the irradiation device of the present invention is used.

FIG. 10 is a schematic perspective view of an operating mechanism of a probe according to the present invention.

FIG. 11 is an explanatory diagram of a scattering state of laser light when laser light is irradiated without using a target.

[Explanation of symbols]

10 handpiece, 16 main optical fiber, 18 bundle fiber, 22 laser light generator, 26 first laser light switch, 28 second laser light switch, 3
2, a condensing lens, 36, a second light quantity measuring photocell, 4
2. First photocell for measuring light quantity, 44 ... Comparator, 46 ...
Irradiation control means, T: target, R, R2: irradiation area.

Claims (9)

(57) [Claims] 1. A laser light is irradiated onto a target on which a coating liquid in which a colored absorptive powder that absorbs laser light and generates heat is dispersed in a dispersion medium is applied to the surface of a living tissue. A laser light generating device; a laser light transmitting means for receiving laser light from the laser light generating device and irradiating the target surface with pulsed laser light in a certain area range. A laser light switching means provided between the laser light generation device and the laser light transmission means; and a reflected light in which a pulse laser light emitted from the laser light transmission means is reflected at a central portion of the irradiation area. First light amount detecting means for detecting the light amount of the laser beam; second light amount detecting means for detecting the light amount of the reflected light of the pulse laser light in a wider area including the center of the irradiation area; The ratio (Im / Ir) of the second light quantity Im detected by the light quantity detection means to the first light quantity Ir detected by the first light quantity detection means is determined by determining whether there is an unirradiated portion or whether re-irradiation is necessary. A laser treatment apparatus for a living tissue, comprising: an irradiation control unit that operates the switching unit as an index at a point in time when laser light irradiation is necessary to cause the laser light from the laser light generation device to enter the laser light transmission unit. 2. A method of irradiating a laser beam to a target on which a coating liquid in which a colored absorptive powder that absorbs laser light and generates heat is dispersed in a dispersion medium is applied to the surface of a living tissue. A laser light generator, a main optical fiber receiving laser light from the laser light generator and irradiating the target surface with a pulse laser light in a certain area range with respect to the target surface; A plurality of bundled optical fibers arranged annularly around the main optical fiber, each end face of which faces the target surface; and a laser light switching means provided between the laser light generator and the main optical fiber; The pulsed laser light emitted from the tip of the main optical fiber is reflected at the center of the irradiation area, enters the main optical fiber, and is reflected by the reflected light emitted from the end face. A first light amount detecting means for detecting an amount, and a second light amount detecting means for receiving the pulsed laser light in a wider area including the central portion of the irradiation area by each of the bundled optical fibers and detecting the amount of reflected light emitted from the rear end face. The ratio (Im / Ir) of the second light quantity Im detected by the second light quantity detection means and the first light quantity Ir detected by the first light quantity detection means As a determination index of the presence or absence or the need for re-irradiation, irradiation control means for operating the switching means at the time when laser light irradiation is necessary to cause the laser light from the laser light generator to enter the laser light transmission means, Laser treatment device for living tissue, comprising: 3. A first laser light switching means on the side of the laser light generating device and a second laser light switching means on the side of the laser light transmitting means, between the laser light generating device and the laser light transmitting means. 3. The apparatus according to claim 2, wherein said first laser light switching means is opened and closed in conjunction with an operator's foot switch, and said second laser light switching means is opened and closed by said irradiation control means. Laser therapy equipment. 4. The laser treatment apparatus according to claim 2, wherein a condensing lens for condensing the reflected light of the laser light on the bundle optical fiber is provided on a tip side of the bundle optical fiber. 5. The laser treatment apparatus according to claim 4, wherein a through-hole is formed in a central portion of the condenser lens, and a distal end of the main optical fiber is inserted through the through-hole. 6. The laser treatment apparatus according to claim 2, wherein said main optical fiber and said bundle optical fiber are fixed to a holder held by an operator. 7. The laser treatment apparatus according to claim 6, wherein the main optical fiber is movably held by a holder so as to adjust a distance from the tissue surface. 8. The laser treatment apparatus according to claim 2, wherein the main optical fiber and the bundle optical fiber are fixed to a holder, and the holder is held on an XY table moving on a plane parallel to the tissue surface. 9. The laser according to claim 1, wherein the target is formed by applying a liquid having a laser beam-absorbing powder having a particle size of 40 μm or less and a dispersion medium to a thickness of 40 μm or less. Treatment device.