JPH025767Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a stone crushing device that is inserted into an organ in which a stone exists and crushes the stone by a driving body driven by the explosion of a layer of gunpowder by an ignition means. It is related to.

[Prior art]

Conventionally, it is already known that explosives are used to crush stones existing in organs, and one method is to use the shock waves generated when explosives are detonated to directly affect the stones to fragment them. Another method is to create a flying object using the gas generated by exploding explosives as an acceleration source, and then collide with the stone to break it up.

In the former method, if an explosive is exploded in contact with a stone, the shock wave generated by the explosion will break the stone, but since the shock wave spreads three-dimensionally, parts other than the stone will also be affected by the strong shock wave. There is a risk of receiving damage.

In addition, the gas generated by the explosion expands rapidly and affects a wide area around it, so there is a problem in that it may cause damage.

On the other hand, according to the latter method, damage caused by shock waves and damage to organs caused by flying stones can be completely avoided, and the energy of the gunpowder is efficiently used as energy for crushing, so a small amount of gunpowder is required. It is possible to crush large stones.

However, in this case, it is natural that the expansion of the explosive gas will affect the organs, and
It is fine if the projectile hits the stone at the right location and at the correct angle, but if the aim is off or the projectile collides at an inappropriate angle, the projectile may miss in an unexpected direction and hit an organ. There is a problem that
If such a situation were to occur, the damage to the organs would be severe.

In order to solve this problem, a stone crushing device has already been provided which has a structure in which the flying object stops after being driven a certain distance.

This stone crushing device can be inserted into an organ where a stone is present, and consists of a thin tube with an open front end.
Furthermore, a housing chamber for the driving body is formed inside the thin tube,
A gunpowder layer and its ignition means are loaded in the rear part of the storage chamber, and a locking part is provided in the front part of the storage chamber, and the gunpowder layer penetrates the storage chamber and protrudes to the outside of the storage chamber. A driving body consisting of a first part having a shape and a second part having a shape that cannot penetrate the storage chamber and can come into close contact with the inner periphery of the thin tube is slidably housed, and the ignition means is activated by the ignition means. In this device, the driving body is driven by the explosion of the gunpowder layer, and the first portion is able to protrude outside the tubule to crush the stone.

According to this device, since the driving body locks after protruding from the tip of the device by a predetermined length, there is no risk of the driving body hitting an organ and causing serious injury, and because of this, explosive gas is not generated. Since there is no leakage to the outside, there is no need to worry about damage caused by this, but if the amount of explosives filled in the explosive layer exceeds the appropriate amount, the first part of the drive body will be cut off from the second part and it will fly out far away. It turns out that there is a drawback that it can cause problems.

Since this device is used inside the body, in order to eliminate this danger, the inventors of the present invention conducted various experiments and studies, and found that the above-mentioned driving body does not stop abruptly, but gradually decelerates and stops. It was found that this danger could be eliminated by doing so, and a locking portion was devised.

[Purpose of invention]

As described above, the present invention is a lithotripter that crushes a stone by means of a drive body that is protruded from the inside of a thin tube that can be inserted into an organ where a stone is present by explosion of a layer of gunpowder. This was done to eliminate the risk of the stone being cut in two parts and thrown out, and it is possible to perform safe stone crushing treatment in which the driving body protruding from the tubule is not suddenly stopped but is gradually decelerated and stopped. The purpose is to provide a crushing device.

[Structure of the idea]

The stone crushing device of the present invention consists of a thin tube that can be inserted into an organ in which a stone is present and has an open front end, and has a housing chamber for a driving body formed inside the thin tube, and a housing chamber for a driving body in the rear part of the housing chamber. A gunpowder layer and its ignition means are provided, and a locking portion of the driver is provided at the front end opening of the housing chamber, and the housing has a shape capable of penetrating the locking portion and protruding to the outside of the housing chamber. a first part having a shape that cannot penetrate the locking part and a second part having a shape that can come into close contact with the inner periphery of the thin tube; It is constructed by making the driving body slidable, and the locking part is provided with a convex object that can be deformed in the event of a collision.

〔Example〕

Hereinafter, the locking part of the present invention will be explained with reference to the drawings. Embodiment 1 of the stone crushing device shown in FIG.
1 is a longitudinal sectional view of a stone crushing device in which a driving body 2 is provided with an annular convex object 2. FIG.

First, reference numeral 1 in FIG. 1 is a thin tube made of metal, the front end of which is open, and a housing chamber 8 adapted to accommodate a driving body 2, which will be described later, formed inside. , the rear end of the thin tube 1 is closed by a closing body 6.

An explosive layer 3 is provided at the rear of the housing chamber 8 of the driving body 2, and an ignition means 4 is provided adjacent to the explosive layer 3.

This ignition means 4 has a leg wire 5 that passes through the closure body 6 and is guided to the outside, and when connected to a power source (not shown), the ignition means 4 generates heat and causes the explosive layer 3 to explode. It's becoming like that.

Next, a locking part 9 is formed in the front end closing part 10 of the storage chamber 8 to stop the movement of the driving body 2.

Therefore, the driving body 2 includes a first portion having a shape that can penetrate the locking portion 9 and protrude to the outside of the thin tube 1.
The part 2' and the locking part 9 cannot be penetrated, and the thin tube 1
a second portion 2'' that can be brought into close contact with the inner wall surface of the device over a predetermined length, and an annular convex object that can be deformed when colliding with the locking portion 9 between the first portion 2' and the second portion 2''. 2 is provided.

In the first embodiment, the storage chamber 8 is configured so that the diameter j in the cross section perpendicular to the axis of the thin tube 1 is the same, and the locking portion 9 is annular and projects radially inward. On the other hand, the first part 2' of the driving body 2 has a diameter slightly smaller than the diameter a of this annular locking part 9, and the second part 2'' has a diameter larger than the diameter a and smaller than the diameter j. It has a very slightly small diameter,
The annular projection 2 is provided between the first part 2' and the second part 2'' and is integrated with the driving body 2,
This has a diameter larger than diameter a and smaller than diameter j.

Therefore, the driving body 2 housed in the housing chamber 8 becomes freely movable in the axial direction of the thin tube 1 due to the explosion of the explosive layer 3, and the first portion 2' protrudes from the tip of the thin tube 1.
The driving body 2 is decelerated by the convex object 2 hitting the locking part 9 and being deformed, and then its movement is stopped by the engagement between the second part 2'' of the driving body 2 and the locking part 9. .

In this way, the driving body 2 moves at high speed due to the explosion of the gunpowder layer 3, but it gradually slows down and stops due to the action of the annular protrusion 2 provided on the driving body 2, so that the narrow locking part 9 is not destroyed. As described above, the driving body 2 is prevented from being destroyed, in which the first portion 2' is cut off from the second portion 2'' and flies far away.

Since the protrusion 2 provided on the drive body 2 decelerates the drive body by deforming as described above, it is necessary to integrate it with the drive body as in Embodiment 1 shown in FIG. It is not always necessary to insert the easily deformable annular convex object 2 through the first part 2' of the driving body 2, contact the second part 2'', and separate it from it, as in the second embodiment shown in FIG. Alternatively, the structure may be such that a groove or the like is simply provided in the second portion 2''.

The shape of these convex objects 2 may be any shape, such as a quadrangle, a triangle, a semicircle, or a star shape, but from the viewpoint of ease of manufacture, embodiment 1 in FIG. 1 and embodiment 2 in FIG. It is preferable to form it into a ring shape as shown in Example 2.

In addition, it is preferable that the material of these convex objects 2 is the same when the driving body 2 and the convex object 2 are integrated as in the first embodiment shown in FIG. In such cases, it is preferable to make it into a thin ring shape that is easily deformed.

For example, with the structure shown in Figure 1, the outer diameter is 2.5 mm and the inner diameter is 2 mm.
In order to make a stone crushing device by using a thin tube 1 with an inner diameter of 1.5 mm at the tip locking part and loading it with 1 to 5 mg of tricinate as a driving agent, the thickness of the annular convex object 2 provided on the driving body 2 is as follows. It is preferable to set it to 0.05 mm - 0.3 mm.

Further, when the protrusion 2 is inserted through the first portion 2' of the drive body 2 as in the second embodiment shown in FIG. 2, it is preferable to use a material that is softer than the drive body 2. Preferred examples of such materials include copper, brass, aluminum, and synthetic resin.

In each of the first and second embodiments shown above, a space layer was provided at the rear of the drive body 2 and the explosive layer 3 was provided, but this space layer was provided to prevent the rear end of the drive body 2 from being destroyed. Depending on the type of explosive used, an explosive layer 3 may be provided in contact with the rear end of the driver 2.

Further, another substance may be placed between the driving body 2 and the explosive layer 3, and the structure may be such that the substance collides with the driving body 2 to move the driving body 2. Of course, the explosive layer 3 may have any shape. You can also leave it there.

In these cases, the locking portion 9 at the tip of the thin tube 1 may become thinner toward the tip, and the ignition means 4 may be an electric ignition device other than the electric ignition device shown in Examples 1 and 2 above. As with conventional lithotripters, igniters such as lasers, squibs, detonating cords, etc. are also preferably used.

As described above, in the stone crushing device of the present invention, the convex object 2 deforms before the driving body 2 hits the locking part 9 at the tip of the thin tube 1 and stops. Since the speed is reduced, even if a slightly larger amount of explosives is loaded than the appropriate amount, the driving body 2 will not easily jump out and separate as in conventional stone crushing devices.

Therefore, in reality, the outer diameter is 2.5 mm, and the inner diameter of the locking part 9 is 2.5 mm.
It is a stone crushing device having a structure similar to that shown in FIG. 1, which uses a thin tube of 1.5 mm and a length of 27 mm, and uses electric ignition.
mm, length 8 mm, diameter 1.45 mm at second part 2'', length 2.5 mm, material stainless steel SUS-304, loaded with 3 to 4 mg of tricinate as gunpowder layer 3, and exploded. It was observed that the first portion 2' of the driving body 2 was cut from the base of the second portion 2'' and jumped out, but the driving body 2 of the present invention was modified with the same structure and under the same conditions. The thickness of the integrated drive body 2 shown in Embodiment 1 of FIG.
By simply replacing the annular convex object 2 with a diameter of 0.1 mm and a diameter of 1.3 mm with a driving body provided 1.5 mm in front of the second portion 2'', the amount of tricinate can be increased by 6 to 7 times the above amount.
It was confirmed that there is no danger of the driver 2 cutting and jumping out even when loaded with MG.

In addition, the convex object 2 shown in Example 2 of FIG.
That is, an annular convex object 2 made of copper having an outer diameter of 1.2 mm, an inner diameter of 1.05 mm, and a length of 1 mm is placed in the first position of the drive body 2.
It has been confirmed that there is no risk of the driving body 2 jumping out even if 6 to 7 mg of tricinate is loaded, which is about double the amount, by just inserting it into the portion 2'.

[Effect of idea]

As explained above, in the stone crushing device of the present invention, when the stone is crushed by the driver that protrudes outside by the explosion of the gunpowder layer from the inside of the thin tube that can be inserted into the organ where the stone is present, Even if a more or less appropriate amount of cover powder is loaded, the deformation of the protrusion provided on the driver can prevent the driver from jumping out of the locking portion of the thin tube.

Furthermore, when the driving body is accommodated within the thin tube, there is an effect that the thin tube and the driving body can be easily fixed.

[Brief explanation of the drawing]

1 and 2 are explanatory sectional views showing each embodiment of the stone crushing device of the present invention, FIG. 1 shows the first embodiment, and FIG. 2 shows the second embodiment. . 1... Thin tube, 2... Drive body, 2'... First part,
2''... Second portion, 2... Convex object, 3... Gunpowder layer, 4... Ignition means, 8... Accommodation chamber, 9... Locking part, 10... Front end closing part.

Claims (1)

[Scope of utility model registration request] It consists of a thin tube with an open front end, and a housing chamber for the driving body is formed inside the thin tube, and an explosive layer and its ignition means are provided in the rear part of the housing chamber, and the driving body is placed in the opening at the front end of the housing chamber. a locking portion, further having a first portion in the storage chamber having a shape that can penetrate the locking portion and protrude to the outside of the storage chamber, and a first portion having a shape that cannot penetrate the locking portion; and a second portion having a shape that can come into close contact with the inner periphery of the thin tube, and a driving body provided between the first portion and the second portion with a convex object that is deformable upon collision at the locking portion. Stone crushing device that can be accommodated freely.