JPS6244240A - 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, for crushing stones formed in the kidneys or urinary tract.
This invention relates to an improved carpentry tool for generating shock waves, which generates shock waves by detonating an explosive placed at the focal point of an elliptical reflector.

[Conventional techniques and problems] Traditionally, open surgery was the only treatment for stones that occurred in the kidneys or urinary tract, but in recent years, extracorporeal shock wave lithotripsy has been developed to cure stones without open surgery. .

Conventional stone crushing equipment crushes kidney stones and urinary tract stones,
The idea is to have the crushed stones naturally excreted from the body along with urine, and specifically, the stones are crushed and removed in the following manner.

That is, the stone crushing device is large enough to submerge the patient's body and is equipped with a shock wave generator and an X-ray imaging device or an X-ray imaging device to see through the affected area of the patient in a water tank filled with water. Become. The shock wave generating device # is comprised of an elliptical reflector, an explosive supported by a support member so as to be located at a first focal point of the elliptical reflector, and an electrode embedded in the explosive to detonate the explosive by energization. and has.

In such a lithotripter, an anesthetized patient's body is first submerged in a water tank. 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. Thereby, the patient's body is fixed so that the affected area is accurately located at the second focus of the ellipse.Then, in the shock wave generator, the explosive placed at the first focus of the elliptical reflector is instantaneously (1 g When detonated in seconds), the high heat accompanying the explosion causes explosive vaporization of water, generating a shock wave. This shock wave propagates through the water, is reflected by an elliptical reflector, and is focused at the second focal point of the ellipse, where the energy density becomes maximum.

Approximately 70% of the skin and muscles of the human body are made up of water, so the energy of shock waves generated in water is transmitted within the body with almost no change. In addition, the shock wave
It has the property of emitting energy when passing through an interface between materials with different acoustic impedances.

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

Since a single shock wave does not break up a stone, in reality, for example, 300 to 500 shock waves are administered to the affected area. Furthermore, the interval at which the shock waves are generated is matched to the heartbeat of patient J.

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

However, in conventional lithotripters of this type, the explosive is supported at the tip of a tubular support member.

Two wooden electrodes are embedded inside the tubular support member, and the explosion is caused by applying a voltage between these two electrodes. Therefore, in order to accurately detonate the explosive placed at the focal point of the elliptical reflector, it is necessary to
The positive and negative terminals of the book must be connected to the power supply correctly.

Then, treatment with this stone crushing device costs 300 yen.
~500 explosions are required.

It is unavoidable to load explosives into the first focal point of the shock wave generator for each explosion, and moreover, it must be loaded quickly, and since the positive and negative terminals must be connected to the power source correctly, loading the explosives takes time. As a result, it takes a long time to crush the stone, and the burden on the patient and the operator becomes extremely large.

This invention has been made based on the above circumstances.

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

[Means for solving the above-mentioned problems] The outline of the present invention for solving the above-mentioned problems is as follows: A tubular body that supports the explosive at its tip and has an annular conductive part on an outer circumferential surface of at least its rear end, and a conductive wire passing through the tubular body, wherein the conductive wire and the conductive part are connected to each other. are connected by a conductive heat-generating member that is in contact with the explosive, and the explosive is made explosive by the heat generated by the conductive member by applying a voltage or passing a current to the conductive wire. It is a pyrotechnic product for generating electricity.

If the tubular body is made of metal, the conductive part itself becomes the conductive part, and if the tubular body is made of synthetic resin, a conductive layer is provided on the surface of the tubular body. can be formed.

The conductive heat generating member can be formed of an ignition powder containing a conductive substance, such as graphite, carbon black, 3/ fiber, etc., dispersed therein, or a high resistance wire such as a platinum wire or a chrome wire.

The conductive heating member is an ignition powder containing a conductive substance.

In some cases, the tip of the conductive wire is inserted into the igniter, a voltage is applied to the conductor as a 1F pole, and the conductive part is grounded to generate a discharge between the conductive wire and the conductive part. It is possible to run f. Note that when this conducting wire is grounded and the conductive part is used as a positive electrode, it is preferable to insulate the surface of the conductive part since this shock wave generating pyrotechnic is used underwater.

Further, when the conductive heating member is a high resistance wire embedded in an explosive, both ends of the high resistance wire are connected to the conductive wire and the conductive part, and the high resistance wire is energized. It is better to be able to generate heat.

However, a preferable conductive heating member is an ignition powder containing a conductive substance such as graphite, carbon black, carbon fiber, etc. dispersed therein. This is because in order to generate heat from this conductive heat generating member, it is sufficient to apply voltage to it using the conductor as the positive electrode, so it is important to use this shock wave generating pyrotechnic device underwater, and it may be dangerous for the patient. This is because safety, ease of operation, and simplification of structure can be achieved.

When the shock wave generating pyrotechnic device has the above configuration, by applying a voltage to the conductive wire and grounding the conductive part of the tubular body, or by energizing the conductive wire inside the tubular body, conductive heat generation is generated. The explosives explode due to the heat generated by the components, and a shock wave is generated at the focal point of the elliptical reflector.

This shock wave generating pyrotechnic device can be connected to a power source by simply inserting it into the support of the elliptical reflector.
Thereby, the shock wave generating pyrotechnics can be easily replaced with respect to the support, and continuous and rapid generation of shock waves can be achieved.

[Embodiment] FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

As shown in FIG. 1, this shock wave generating pyrotechnic device 1 has an explosive 4 disposed at one end of a metal tubular body 2 having a circular cross section via a conductive heating member 7. An electrode 6 made of a conductive wire 5 is inserted into the inside of the electrode. One end of this conductive wire 5 is inserted into the conductive heating member 7, and the other end of this conductive wire 5 is inserted into the conductive heating member 7.

As shown in FIG. 2, the other end of the tubular body 2, which is sealed with an insulating member 9, is connected to a terminal 10 located approximately at the center.

As the explosive 4, for example, a horse mackerel or the like can be used.

The conductive heating member 7 is an ignition powder containing a conductive substance such as carbon black dispersed therein, and is arranged so as to seal one end of the tubular body 2.

Further, the conducting wire 5 can be connected as a positive electrode to a voltage source (not shown) via the terminal 10, and the tubular body 2 is grounded as a negative electrode.

The shock wave generating pyrotechnic device L having the structure of 41J is inserted into the support of an elliptical reflector in a stone crushing device (not shown), so that the explosive 4 is placed at the focal point of this elliptical reflector. . This support is, for example, the tubular body 2
It has a circular recess into which the other end can be inserted, the inner peripheral surface of this circular recess is made of metal, for example, and the metal inner peripheral surface of this recess is grounded. Further, a contact point is arranged at the center of the bottom surface of the recessed portion, which is insulated from the metal inner circumferential surface and connected to a voltage source. therefore,
By simply inserting the other end of the tubular body 2 into the recess of this support, the contact point and the other end of the conducting wire 5 can be electrically connected! l
In addition, the grounded metal inner layer surface and the circumferential surface of the tubular body 2 are electrically connected.

Therefore, when a voltage is applied to the conductive wire 5 from a voltage source, discharge occurs between the conductive wire 5 in the conductive heat generating member 7 and the tubular body 2, the conductive heat generating member 7 generates heat, and the explosive 4 is released. It explodes, creating a shock wave.

In this way, the explosive 4 can be placed at the focal point of the elliptical reflector by simply inserting the shock wave generating pyrotechnic l into the support inside the elliptical reflector, so the positive and negative electrodes cannot be changed as in the conventional case. - Shock waves can be generated quickly without the need to check each time.

FIG. 3 shows a second embodiment of the invention.

:jS2 is an example of #? As shown in FIG. 3, the shock wave generating carpentry product 1 includes a high-resistance conductive heat generating member 7 contained in an explosive 4 placed at one end of a metal tubular body 2 with a circular cross section via a spacer 3. A wire 8, for example, a platinum wire or a nichrome wire, is embedded, and one end of the high resistance wire 8 is connected to the tubular body 2.
is electrically connected to one end of a conductive wire 5 passing through the inside of the conductive wire 5, and the other end of the high resistance wire 8 is electrically connected to the tubular body 2. Further, the outer peripheral surface of the metal tubular body 2 is coated with an insulating material such as paint.

The other end of the conducting wire 5 is electrically connected to a terminal lO located at the center of the circle on the other end surface of the tubular body 2. The other configurations are the same as those of the first embodiment.

The shock wave generating pyrotechnic device 1 configured in this manner has the above-mentioned ml
As in the embodiment described above, it is inserted into the support of the elliptical reflector in the lithotripter so that the explosive charge 4 is located at the focal point of this elliptical reflector. This support is the first
The shock wave generating pyrotechnic device 1 can be inserted into the recessed portion of the support.

The shock wave generating pyrotechnic device 1 according to the second embodiment also has the same effects as the first embodiment, but
What is different from the above embodiment is that when the shock wave generating pyrotechnic device 1 is inserted into the recess of the support, a circuit is formed by the power source, the conductor 5, the high resistance wire 8 and the tubular body 2, and the high resistance line 8
The process is to energize and heat it. This high resistance wire 8
When energized, the high resistance wire 8 generates heat, which causes the explosive to explode and generate a shock wave.

Comparing the first embodiment and the second embodiment, the first embodiment is preferable because of its simple structure.

Next, as a third embodiment, a shock wave generating pyrotechnic device 1 in which a conductive layer is formed on the surface of a tubular body 2 is shown in FIG.

The shock wave generating pyrotechnic device l shown in FIG. conductive layer 1
2 is formed parallel to the axis of the tubular body 2, and the other end of this conductive layer 12 is formed in an annular shape surrounding the circumferential side of the other end of the tubular body 2, and the other end of the conductive layer 12 is formed parallel to the axis of the tubular body 2. The configuration is similar to that of the embodiment.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the embodiments described above, and that the present invention can be practiced with appropriate modifications within the scope of the gist of the invention.

In any of the above embodiments, the shock wave generating pyrotechnics l
Although the tubular body 2 in is a cylindrical body, it may be a rectangular cylinder.

[Effects of the Invention] According to the present invention, by simply inserting the shock wave generating pyrotechnic into the support within the elliptical reflector, the explosive can be placed at the focus of the elliptical reflector, and the conductor inserted into the tubular body can be placed. Since the conductive part of the tubular body can be electrically connected to the power source without directionality, it is no longer necessary to check the positive and negative polarity of the electrodes during work, as in the past, and shock waves can be generated quickly. I can do it. Therefore, a large number of shock waves for stone fragmentation can be emitted in a short time, and treatment for stone fragmentation can be completed in a short time.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a partial vertical sectional view showing a first embodiment of the present invention;
FIG. 2 is a bottom view showing the first embodiment, FIG. 3 is a partial vertical sectional view showing the second embodiment of the invention, and FIG. 4 is a side view showing the third embodiment of the invention. It is a diagram. 1... Pyrotechnics for generating shock waves, 2, Φ, tubular body, 4...
Explosives, 5... Conductive wire, 6... Electrode, 7... Conductive heating member, 8. Fist/high resistance metal wire, 11... Conductive additive, 12... Conductive layer.

Claims (7)

[Claims] (1) A shock wave generating pyrotechnic device that generates a shock wave using an explosive placed at the focal point of an elliptical reflector in a stone crushing device, which supports the explosive at its tip and has an annular ring on the outer peripheral surface of at least its rear end. A tubular body having a conductive part and a conductive wire inserted through the tubular body, the conductive wire and the conductive part are connected by a conductive heating member in contact with the explosive, and a voltage is applied to the conductive wire. 1. A pyrotechnic device for generating shock waves, characterized in that an explosive can be detonated by heat generation of the conductive member by applying current to the conductive member. (2) The shock wave generating pyrotechnic device according to claim 1, wherein the tubular body is made of metal and is a conductive part itself. (3) The shock wave generating pyrotechnic product according to claim 1, wherein the tubular body is made of synthetic resin, and the conductive portion is a conductive layer formed on the surface of the tubular body. (4) The conductive wire is a positive electrode to which a voltage is applied, and the conductive part is a grounded negative electrode.
A pyrotechnic device for generating shock waves according to any one of paragraphs 1 to 3. (5) The shock wave generating pyrotechnic device according to any one of claims 1 to 4, wherein the conductive heating member is an igniter containing a conductive material. (6) The shock wave generating pyrotechnic product according to claim 6, wherein the conductive material is carbon black, graphite, or carbon fiber. (7) The conductive heat generating member is embedded in an explosive and has both ends connected to the conductive wire and the conductive portion, and is a high resistance wire capable of passing a current. A pyrotechnic device for generating shock waves as described in any of items up to 3.