JPS6244241A - Article processed with heat for generating impact wave - 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] [Industrial Application Field] The present invention relates to a pyrotechnic device for generating shock waves, and more specifically, a pyrotechnic device for generating shock waves in water to crush stones formed in the kidneys or urinary tract. This invention relates to an improved shock wave generating pyrotechnic device for use in the field.

[Prior Art and Problems] In recent years, an extracorporeal shock wave lithotripsy method has been developed to cure stones without cutting them, for which open surgery was the only treatment method.

According to a conventional stone crushing device for crushing kidney stones, urinary tract stones, etc., stones are crushed in the following manner.

That is, the stone crushing device is equipped with a shock wave generating device and an X-ray photographing device or an X-ray imaging device for seeing through the patient's affected area in a water tank that is large enough to submerge the patient's body and filled with water. . The shock wave generator includes a semi-elliptical reflecting mirror and an electrode provided with an explosive that is disposed at a first focus of the semi-ellipse and ignites when energized.

In such a stone crushing device, anesthesia is first applied to a tank filled with water. Submerge the patient. ,+,!
! In order to confirm and monitor the exact location of the affected area, the affected area is displayed on a monitor screen using an X-ray photographing or imaging device.

This fixes the patient's body so that the affected area is precisely located at the second focus of the ellipse.Then, in a shock wave generator, the explosive placed at the first focus of the ellipse is instantaneously (l river sand) When detonated, the high heat accompanying the explosion causes an explosive vaporization of water, creating a shock wave. This shock wave propagates through the water, is reflected by an elliptical reflector, and is reflected by the second elliptical mirror.
It is focused at a focal point, where the energy density is maximum.

Approximately 70% of the skin and muscles of the human body are composed of water, so the energy of shock waves generated in water is transmitted within the body with almost no change. Furthermore, a shock wave has a characteristic of emitting energy when passing through an interface between materials having different acoustic impedances.

Stones are usually formed of calcium-containing substances, so when a shock wave hits a stone, the energy of the shock wave is released and causes the stone to fragment.

Since the stone is not fragmented by one shock wave, in reality, 5
0 to 500 shock waves are administered to the affected area. Furthermore, the interval at which the shock waves are generated is matched to the patient's breathing.

The broken stone pieces are naturally expelled from the body, allowing the affected area to heal.

However, since the explosives used in conventional lithotripters are detonated by passing electricity through, for example, a metal wire, which is passed through the explosives in water, there is a risk that the patient may receive an electric shock when the current is applied. . In addition, since 50 to 500 explosions are required, it is unavoidable to load explosives into the first focal point of the shock wave generator for each explosion, and since it takes time to load the explosives, it takes a long time to crush the stone. .

This invention has been made based on the above circumstances.

That is, an object of the present invention is to provide a shock wave generating pyrotechnic device that generates LM waves by exploding an explosive, which has a simple structure and can quickly and continuously detonate the explosive to shorten the time required for stone fragmentation. The object of the present invention is to provide a pyrotechnic product for generating shock waves.

[Means for solving the above problem] The outline of the present invention for solving the above problem is as follows: In a shock wave generating pyrotechnic device that generates a shock wave at the focal point of a spheroid, it is possible to pass through the focal point of the ellipse. A part of the string to be pulled is guided into each of a plurality of waterproof containers, and an explosive and an initiator that can be ignited by friction are stored in the waterproof containers, and the initiator and the string are brought into contact. A carpentry product for generating HiM waves, characterized by comprising a shock wave generator formed of a shock wave generator, and a container support disposed at the focal point of the ellipse and fixing the waterproof container against tension of the string. be.

More specifically, the shock wave generating pyrotechnic device according to the present invention includes a plurality of shock wave generators and a container support.

The container support is placed at the first focus of an elliptical reflector placed in a tank filled with enough water to submerge the patient's body. In order to support the shock wave generator at the first focal position, this container support includes a receiving part that supports the shock wave generator, and a string guide part that guides the string that connects the plurality of shock wave generators. .

Each of the plurality of shock wave generators has a waterproof container and an explosive and a detonator filled in the waterproof container, and are interconnected by drawing a portion of the string into the waterproof container. At the same time, it has a structure that allows a portion of the string pulled into the waterproof container to come into contact with the detonator. By pulling the string, each shock wave generating body is guided to the container support in sequence, and when the string is further pulled against the shock wave generating body supported by the container support, the detonator and the string are released inside the waterproof container. The structure is such that the friction with a part of the bomb ignites the primer, causing the explosive to explode.

The string can be made of a material that is heat resistant and flexible, and can be made of, for example, a thin metal wire.

Since this shock wave generator only needs to generate shock waves in the state fE supported by the container support, there is no particular limitation on the shape of the waterproof container, and various shapes such as spherical, cylindrical, and cube shapes can be used. can be adopted. However, it is preferable to use a spherical container because if the waterproof container is spherical, when the shock wave generator is supported by the container support, there is no directionality in the support state, and it is convenient to support the shock wave generator. This is because it can be done.

Furthermore, the waterproofness of the waterproof container may be achieved by any means as long as it can ensure the ignition of the detonator and the explosive in water. This can be achieved by applying a waterproof material or waterproof paint.

Any explosive can be used as long as it can create a powerful explosion underwater and generate a shock wave.

For example, lead azide, DDNP, thunderbolt, etc. can be used.

The amount of explosives to be filled in a waterproof container cannot be uniformly stated depending on the amount of shock wave energy to be generated, but it is usually 3 to 20 mg, preferably 8 to 12 m
It is g.

As the explosive, for example, a mixture of potassium chlorate and red phosphorus, a mixture of potassium chlorate and antimony trisulfide, red phosphorus, lead azide, copper azide, or a mixture thereof is used. be able to.

The amount of detonator in the waterproof container may be sufficient to ignite due to friction with the string and cause the explosive to explode when the detonator is ignited. ing.

Contact between this detonator and a portion of the string within the waterproof container
For example, this can be achieved by applying an explosive to a portion of the string drawn into a waterproof container, or by inserting a portion of the string into the solidified explosive.

A shock wave generating pyrotechnic device with a structure like the one described above can crush stones through the following actions.

The first shock wave generator is moved to the container support by pulling, for example, an end of a string connecting the plurality of shock wave generators, and the shock wave generator is supported on the container support. Furthermore, when the string is pulled, the shock wave generator is attached to the container support, so only the part of the string that has been drawn into the waterproof container is further pulled, causing the detonator to ignite due to friction. and the explosives explode.

A shock wave is generated by the rapid vaporization of water when an explosive explodes.

The container itself is placed at the first focus of the elliptical reflector, and the affected area of the patient is placed at the second focus of the elliptical reflector.
Since the patient's body and the position of the elliptical reflector are adjusted, the shock wave generated at the first focal point is reflected on the elliptical reflector and then converged at the m2 focal point. Impact energy is applied to the stones in the affected area.

The explosion of the explosive destroys the waterproof container, so that the receptacle of the container support becomes empty.

When the string is further pulled, the second shock wave generator moves and fits into the receiving part of the empty container support. Then, when the string is pulled further in the same manner as the first shock wave generator, the friction causes the ignition of the initiating charge and the explosion of the explosive, generating a second shock wave, which causes stones in the affected area. The impact energy of the second note will be added to .

By repeating this process, the tension of the string causes shock waves to be generated one after the other, applying impact energy to the stone.

The intervals at which shock waves are generated, in other words, the intervals at which explosives are detonated, are preferably matched to breathing, and for this purpose, the pulling speed of the string, etc. may be appropriately determined.

[Examples] Next, examples of the present invention will be shown to illustrate the present invention more specifically.

1 and 2 are cross-sectional views showing a first embodiment of the invention.

As shown in FIGS. 1 and 2, the shock wave generating hole item has a plurality of #4!! wave generating bodies 2 and a container support 3 connected to a string l.

As shown in the figure, one string, such as a fully bent thin wire, passes through the shock wave generators 2 at predetermined intervals, thereby connecting the plurality of shock wave generators 2.

This shock wave generator 2 has a waterproof coating formed by applying collodion or the like to the outer periphery of a spherical solidified explosive 4 such as lead azide, and this waterproof coating forms a waterproof container 5. In addition, the explosive 4 contains a detonator 6.
For example, a mixture of potassium chlorate and red phosphorus is embedded, and the cord 1 is inserted through the explosive 6.

The container support 3 is placed at the first focal point of an elliptical reflector placed at an appropriate position in a water tank that is large enough to submerge the patient's body. As shown in FIG. 2, this container support 3 includes a hollow support 7 and a hemispherical receiving portion 8 provided at its tip. The inside of the hollow support 7 serves as a string guide portion 9, and the support #7 is configured to open at the bottom surface of the receiving portion 8.

The string 1 that connects the plurality of shock wave generators 2 is connected to this receiving part 8.
It is inserted into the string guide section 9 from either side. The tip of the inserted string 1 is connected to a suitable tensioning means, and by regularly pulling the string 1, the shock wave generator 2 connected to the string 1 is guided to the receiving part 8. It has become so.

In this embodiment device, by pulling the string l, the first shock wave generator 2 is guided to the container support 3,
This first shock wave generator 2 fits into the receiving part 8. When the string 1 is further pulled while the first shock wave generator 2 is engaged with the receiving part 8, the string 1 moves and starts up. Explosive 6 and string 1
Thereby, the explosive 6 is ignited. At the same time, explosive 4 also ignites and explodes, emitting light and heat. and,
Shock waves are generated by inducing rapid vaporization of water.

The shock waves generated at the first focal point propagate through the water in the same way as in the conventional method, and are focused at the second focal point, imparting impact energy to the stone located at this position.

Due to the explosion of the first shock wave generator 2, the receiver 8 becomes empty, so when the string 1 is further pulled, the second shock wave generator 2 is guided to the receiver 8 next. The second part is attached to the receiving part 8.
The shock wave generating body 2 of 2 is made to be in the relationship 1. When the string 1 is pulled while the second shock wave generator 2 is engaged with the receiving part 8, a shock wave is generated as in the case of the first shock wave generator 2.

Thereafter, by pulling the string 1, the shock wave generators 2 are successively detonated one after the other, and shock waves can be continuously generated.

Next, another embodiment of the invention will be described with reference to FIG.

FIG. 3 is a sectional view showing a second embodiment of the invention.

The difference between this second embodiment and the first embodiment is that a plurality of shock wave generators 2 are connected by strings 1.

That is, in this embodiment, the string 1 has branch lines 10 at predetermined intervals, and the tip of each branch line 10 of the string 1 is coupled to the shock wave generator 2. The tip of this branch line 10 is embedded in the shock wave generator 2 until it passes through the waterproof container 5 and the initiator 6 and reaches the inside of the explosive 4.

Even in this second embodiment, the same effect as in the first embodiment can be achieved.

[Effects] According to this invention, no electrical means is used to generate shock waves underwater, so there is no risk of electric shock to the patient, and JJ! The safety of people can be ensured.

Since the shock wave generator of the present invention is formed using gunpowder, the #I shock wave generator itself can be easily manufactured.

The shock wave generators are connected by a string, and shock waves can be generated one after the other by pulling the string.

Therefore, while relying on explosives to generate shock waves, it is possible to generate shock waves quickly, continuously, and easily. Therefore, the time for stone crushing can be shortened, and the burden on one operator and patient can be reduced accordingly.

[Brief explanation of drawings]

1 and 2 are sectional views showing a first embodiment of the invention, and FIG. 3 is a sectional view showing a second embodiment of the invention. 1... String, 2... Shock wave generator, 3... Container support, 4... Explosive, 5... Waterproof container, 6... Explosive.

Claims (7)

[Claims] (1) In a shock wave generating pyrotechnic device that generates shock waves at the focal point of a spheroid, a part of the string that can be pulled through the focal point of the ellipse is guided into the inside of each of a plurality of waterproof containers, and the waterproof An explosive and an initiator that can be ignited by friction are stored in a container, and a shock wave generator is formed by contacting the initiator with a part of the string, and a shock wave generator is placed at the focal point of the ellipse and the string is pulled. A pyrotechnic product for generating shock waves, comprising a container support for fixing a waterproof container to a container support. (2) The shock wave according to claim 1, which is generated when the string has a plurality of branch lines in the middle thereof, and the tip of each branch line is drawn into a waterproof container and comes into contact with the detonator. Pyrotechnics for generation. (3) Shock wave generation according to claim 2, in which the explosive is applied to the tip of each branch wire drawn into the waterproof container, thereby making contact between the explosive and the string possible. Pyrotechnics. (4) The shock wave generating pyrotechnic device according to claim 1, wherein the string has no branch wires and penetrates a plurality of waterproof containers. (5) The shock wave generating pyrotechnic product according to claim 4, wherein the explosive is applied to a plurality of locations in the intermediate portion of the string to enable contact between the explosive and the string. . (6) The shock wave generating pyrotechnic product according to any one of claims 1 to 5, wherein the explosive is an initiator such as lead azide or DDNP. (7) The above, wherein the explosive is any one of a mixture of potassium chlorate and red phosphorus, a mixture of potassium chlorate and antimony trisulfide, red phosphorus, lead azide, and copper azide, or a mixture thereof. A pyrotechnic device for generating shock waves according to any one of claims 1 to 6.