JPH0380844A - Laser medical treatment device - Google Patents

Abstract

PURPOSE:To quickly and correctly execute the laser medical treatment by emitting immediately a laser by an operation of a laser operating part, in the case an encoder pulse signal and an ultrasonic detecting signal are inputted. CONSTITUTION:First of all, an inserting part 1 is inserted into a blood vessel and when it reaches the vicinity of the medical treatment part, a driving signal is sent through a driving part 10 to an ultrasonic vibrator 2 provided on the tip of the inserting part 1 by operating it on the handy side of a surgical operator and it is driven. The ultrasonic vibrator 2 makes one rotation and radiates an ultrasonic wave to a thrombus 6a of a blood vessel inner wall 6 and receives an echo signal, and also, executes a necessary signal processing from angle information from an encoder and reflects an ultrasonic image on a monitor 14 of an observing device 15. Subsequently, the ultrasonic echo signal received by the ultrasonic vibrator 2 is converted to an electric signal, its value is compared with a prescribed value by a diseased part detecting part 7, and in the case it is larger the prescribed value, it is decided that the thrombus 6a exists by the diseased part detecting part 7, and a laser operating part 8 starts laser irradiation through a light source 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser treatment device, and is particularly used for treating an affected area within a body cavity.

[Conventional technology]

Treatment using lasers is not used to remove abnormal bath material in weak areas within body cavities, which would be extremely dangerous to remove with a regular scalpel, or to destroy tissue around a tumor. It is well known. To date, many cases of successful treatment of malignant tumors using lasers have been reported.

This laser treatment device has a display on the monitor to shorten the time from detection of the affected area to treatment, and to avoid misalignment of the treatment device relative to the affected area and enable prompt and appropriate laser irradiation. While controlled by ultrasonic tomographic images,
A device that activates a treatment device has been proposed.

[Problem to be solved by the invention]

However, conventional laser treatment methods have the following problems. That is, after inserting an intracorporeal insertion section with a laser treatment device into the body cavity and driving an ultrasound transducer to obtain a tomographic image of the affected area, the laser treatment device is activated to perform treatment such as excision of the affected area. However, there is an inconvenience that it is difficult to carry out prompt treatment due to the timing deviation of laser irradiation.

Further, although it is sufficient to apply laser irradiation only to the affected area, there is a risk that an unnecessary operation of the laser treatment device may result in irradiation being applied to an unnecessary area.

The present invention is proposed to solve the above-mentioned problems.
The purpose of the present invention is to provide a laser treatment device that achieves safety and reliability of laser treatment.

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a laser treatment device having an ultrasonic observation means for observing an affected area with an ultrasonic transducer that rotates and scans, and a treatment means using a laser. A laser treatment device is provided with an affected part detection means for detecting the presence or absence of an affected part from a signal from the ultrasonic observation means, and a laser emitting means for emitting a laser beam based on the signal from the affected part detection means.

In this way, since the laser is emitted by the operation of the affected area detection means, the timing of laser emission is not lost, and the laser can be emitted appropriately only to the necessary locations.

〔Example〕

One embodiment of the present invention will be described below. The embodiment shown in FIG. 1 is a laser treatment device that is inserted into a blood vessel to detect a thrombus and further treat it.

An ultrasonic transducer 2 is provided at the tip of the insertion section 1, and this ultrasonic transducer 2 rotates in a direction perpendicular to the axis of the insertion section so as to radiate ultrasonic waves over the entire 360° circumference. It's Nishide. The ultrasonic waves emitted toward the inner wall of the blood vessel propagate to the living body deep within the inner wall, and the ultrasonic waves reflected from there are received again by the ultrasonic transducer 2 and converted into electrical signals. After this electric signal is amplified and detected by an amplification detection circuit, it is input to a display device together with an angle signal from an encoder, and an ultrasonic tomographic image from the inner wall of the blood vessel to the deep part of the inner wall is displayed.
If there is a thrombus, its location and depth can be detected.

Near the tip of the insertion section 1, the tip of a laser guide 3 having a tip 4 is projected. The laser guide 3 is arranged in parallel with the signal cable 5 of the ultrasound transducer 2 and extends inside the insertion section toward the operator's hand.

Laser beams are used to treat tissues by focusing them, irradiating them out of focus to create perforations, vaporizing them, and so on.

In order to perform treatment using the laser treatment device with the bottom of the gutter, the insertion section 1 is first inserted into the blood vessel, and when the insertion section 1 is near the treatment area, the insertion section 1 is inserted at the tip of the insertion section 1 by operation at the operator's hand. A drive signal is sent to the ultrasonic transducer 2 via the drive unit 10 to drive it. The ultrasonic transducer 2 is
One rotation (360°) to transmit ultrasound to the thrombus 6a on the blood vessel inner wall 6.
The ultrasonic wave image is projected onto the monitor 14 of the observation device 15 by performing necessary signal processing based on the angle information from the encoder.

Then, the ultrasound echo signal received by the ultrasound transducer 2 is converted into an electrical signal (voltage), and the affected area detection unit 7 compares the value with a predetermined value. I am trying to determine that it is a thrombus 6a. In this case, the predetermined value is a value of an electrical signal based on an echo signal from normal tissue. When the affected area detection unit 7 determines that there is a thrombus 6a, the laser operation unit 8 starts laser irradiation via the light source 11. On the other hand, the ultrasonic transducer 2 rotates once and detects the thrombus 6 in the affected area detection section 7.
If it is determined that a is not present, laser irradiation is not performed.

The angle information is obtained by the encoder 16 connected to the motor 12, and the signal from the encoder 16 is input to the signal processing unit 13 of the observation device 15.

To explain more specifically the timing of laser emission, when the ultrasonic transducer rotates 5 times/sec,
The time required for one rotation is Q, 2 seconds. Since laser emission must be controlled for each rotation, the emission time must be 0.2 seconds or less. If the emission time per one time is Q, 1 sec, the maximum at l sec is Q, 1 sec x 5 times = 0
．． A laser beam of 5 seconds will be emitted.

To position the target when emitting a laser beam, if the tip at the tip of the laser guide 3 is not in contact with the inner wall of the blood vessel, the ultrasonic wave is focused on the surface to be scanned, as shown in Figure 2. It may be positioned on the plane 9 from which a tomographic image is obtained. Further, when the contact tip 4 at the tip of the laser guide 3 comes into contact with the inner wall 6 of the blood vessel, the contact tip 4 is positioned on the surface 9 where the ultrasonic tomographic image is obtained and on the inner wall surface 6 of the blood vessel, as shown in FIG. Operate as follows.

After the laser has been irradiated and the thrombus has been cauterized, the ultrasonic detection signal indicating that there is a thrombus is not manually input to the laser operating unit 8, so the laser will not be emitted to the same area from now on, so safety is ensured. ing.

In this manner, laser emission is performed via the affected area detection unit 7 by detecting a thrombus using an ultrasonic transducer or the like, and is performed shortly after detection, so that appropriate and prompt laser treatment can be performed.

The present embodiment is as described above, but an ultrasonic tomographic image is displayed on the monitor based on the signal from the ultrasonic detection means, and a means for setting the laser irradiation range on the monitor and a means for setting the range are provided. By providing a means for controlling laser emission, it is possible to perform laser irradiation more reliably. In this case, the laser emission control means would control the emission end direction, target positioning, laser output, or time. Figure 4 shows the case of setting the irradiation range in the radial direction (Figure A) and the case of setting the irradiation range by angle (Figure 8).
are shown respectively.

〔Effect of the invention〕

As described above, according to the present invention, when the encoder pulse signal and the ultrasonic detection signal are input manually, the laser operation section is activated to immediately emit the laser beam for treatment, so that prompt and appropriate laser treatment can be performed. can.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing the relationship between a laser beam and an ultrasonic tomographic plane, and FIGS. 4A and B are laser irradiation diagrams. It is an explanatory diagram showing a range. 210. Ultrasonic transducer 301. Laser guide 7°0. Affected area detection unit 800. Laser operation unit io, , drive unit 11, , light source

Claims (1)

[Scope of Claims] 1. In a laser treatment device having an ultrasonic observation means for observing an affected area using a rotationally scanning ultrasonic transducer and a treatment means using a laser, the presence or absence of an affected area is detected from the signal from the ultrasonic observation means. What is claimed is: 1. A laser treatment device comprising: a diseased part detection means for detecting a diseased part; and a laser emitting means for emitting a laser beam based on a signal from the diseased part detection means.