JPS62299915A - Optical fiber cable - Google Patents

Abstract

PURPOSE:To uniformly distribute the dispersion of power density at the time of defocus radiation within a defocus radiation range and to execute rapid and uniform burning of a diseased part by rotatably fitting a radiation optical fiber. CONSTITUTION:An optical fiber for leading laser beams is divided into a light guiding optical fiber 11 and a radiation optical fiber 20 and the fiber 20 is rotatably fitted with the inclination of a prescribed angle from the optical axis. Thereby, the laser beams transmitted through the fiber 11 are made incident on the fiber 20 and the position with the highest power density can be uniformly distributed into the whole area of the radiation range at the time of defocusing by rotating the fiber 20. Since the fiber 20 with the prescribed angle from the optical axis is rotated, the peripheral diseased part 10 of a recessed part can be irradiated by the laser beams.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to an optical fiber cable that guides a laser beam or the like to a target site.

2. Description of the Related Art Conventionally, in a laser scalpel device as shown in FIG.
A small diameter optical fiber 2 with excellent operability is used.One cable 2 is used.

Problems to be Solved by the Invention Laser therapy used during surgery includes cases in which laser light is irradiated in a focused position (focal position) and cases in which it is irradiated in a defocused position (non-focal position).

In the case of defocused irradiation, if it is irradiated directly from the laser light source, the laser light mode will be as shown in Figure 6,
Laser light transmitted through an optical fiber has a mode distribution with varying power density as shown in FIG. As shown in FIG. 6, when the laser light emitted from the laser light source passes through the optical fiber 3, it passes through the optical fiber 3 while being reflected. There is a portion 4 where the laser beam is concentrated, and the power density of the emitted laser beam varies locally, particularly in the defocus range.

When cauterizing the affected area with defocused irradiation, short-time irradiation such as pulse irradiation causes uneven cauterization, and this is a problem that must be eliminated.

In addition, there is also the problem that in focused or defocused irradiation, the irradiation range is limited to a linear position on the optical axis of the optical fiber, making it difficult to irradiate surrounding affected areas on the four parts.

Means for Solving the Problems The technical means of the present invention for solving the above problems is that the optical fiber that guides the laser beam is divided into a light guide optical fiber and an irradiation optical fiber, and the irradiation optical fiber is made rotatable. Furthermore, by tilting the light at a predetermined angle with respect to the optical axis, it is possible to eliminate variations in power density and to irradiate a wide range of concave portions.

Effect The effect of this technical means is as follows. That is, the laser beam transmitted through the light guide optical fiber is incident on the rotatable irradiation optical fiber, and by rotating this irradiation optical fiber, the areas with high power density are uniformly distributed over the entire irradiation range during defocusing. Furthermore, by rotating the irradiation optical fiber at a predetermined angle with respect to the optical axis, it is possible to irradiate the four surrounding affected areas.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2. In FIG. 1, reference numeral 11 denotes a light guiding optical fiber, which is housed and held in a protective tube 12 made of metal or the like. Reference numeral 13 denotes a holder fixed to the protective tube 12, which is built into the outer tube 14 and has a rotation bearing 16 at one end. The probe 16 externally fitted on the rotation bearing 16 has a lens 17 fixedly held therein by a rotation ring 1g, and a window or lens 19 (hereinafter referred to as window 19)'f: held on the output end side. 20 is a protection pipe 21
The optical fiber for irradiation is housed and held between the lens 17 and the window 19, and the bearing 2
Retained by 2 1. be done. 23 is a drive motor built into the glove 16.

To explain the operation, the laser beam transmitted through the light guide optical fiber 11 is irradiated and focused on the lens 17 and transmitted to the irradiation optical fiber 20. The globe 16 is rotated by the drive motor 23 and the rotation bearing 15, and the built-in irradiation Kawanishi fiber 20 rotates and irradiates the laser beam.

In FIG. 2, a light guiding optical fiber 11 and a lens 17 are shown.
An outer pipe 24 that contains a bearing 26 has a bearing 26 at one end, and a holding member 26 fits into this bearing 25. The holding member 26 holds the irradiation optical fiber 20 housed in the protection pipe 21, and has a knob 26a'i on the outside. The irradiation optical fiber 20 is processed so that its output end is at a predetermined angle with respect to the optical axis.

To explain the operation, by turning the knob 26a of the holding member 26, the irradiation optical fiber 2 is held.
0 rotates, and the four-part-shaped affected area 1o can be irradiated.

In FIG. 3, 27 is a rotating gear fixed to the holding member 26, and meshes with the driving gear 28.

The driving gear 28 is pivotally supported by the outer pipe 24, and a wire 29 is wound around the other end of the shaft. The holding member 26, which has a bearing inside and is rotatable, has a spiral spring 3.
o is energized and the whole is covered with a cover 31.

To explain the operation, by pulling the wire 29, the driving gear 28 rotates, and the rotating gear 27 meshes with the driving gear 28.
The interlocking rotation causes the fixed holding member 26 and the irradiation optical fiber 20 housed in the protection pipe 21 to rotate. The laser beam transmitted through the light guide optical fiber 11 is irradiated from the irradiation optical fiber 20. When the wire 29 is released, the rotating gear 27 rotates in the opposite direction due to the biasing force of the spiral spring 3o, and the wire 29 is wound back to its original state.

By dividing the optical fiber into a light guide optical fiber and an irradiation optical fiber and making each irradiation light beam rotatable, variations in power density during defocused irradiation can be suppressed within the defocused irradiation range. It can be distributed evenly and the affected area can be cauterized quickly and uniformly.

In addition, by setting the end face of the rotating optical fiber for irradiation at a predetermined angle with respect to the optical axis, it is possible to irradiate the surrounding affected area in a four-part shape, and since the cover 31 does not rotate and the fiber for irradiation 20 rotates, It is safe and can irradiate a wide range of surrounding tissue, such as inside the body, without any influence due to rotation even if it is in contact with it.

[Brief explanation of the drawing]

1, 2, and 3 are partial cross-sectional views of the handpiece portion of an optical fiber cable according to an embodiment of the present invention, FIG. 4 is an external view of a laser scalpel device, and FIG. Figures 6 and 7 showing the modes are diagrams showing the power mode in the conventional example. 11... Optical fiber for light guide, 2o...
- Optical fiber for irradiation, 26... Holding member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4? Figure 5 Figure 6 Figure 7 Figure 1□')

Claims (2)

[Claims] (1) A light guiding optical fiber that guides the laser beam,
An irradiation optical fiber is connected to the light guide optical fiber at a predetermined interval on the optical axis, and an optical fiber cable is provided with a rotating means for rotating the irradiation optical fiber. (2) The optical fiber cable according to claim 1, wherein one end of the irradiation optical fiber is formed at a predetermined angle with respect to the optical axis.