JPS6111112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for crushing stones formed within a body cavity such as the bladder.

Devices for crushing and removing stones formed in body cavities using the explosive energy of explosives are already known, as seen in Japanese Patent Publication No. 46998/1983.
In other words, the conventional crushing device described above provides an explosive chamber at the tip of the body cavity tube inserted into the body cavity, forms a thin-walled weak part on the chamber wall of this explosive chamber, and uses the explosive loaded in the chamber as a detonator. By detonating it, the fragile portion was first damaged, and the concretion was shattered by intensively applying explosive energy to the concretion through the through hole created by this damage.

However, explosives are usually susceptible to deterioration due to chemical reactions caused by moisture or gas, and since the amount of explosives used in this type of crushing equipment is particularly small, it is important to ensure a reliable explosion and to ensure sufficient explosive energy. It is something that cannot be obtained by doing so. However, since the above-mentioned conventional method uses naked explosives, it is easily deteriorated, and the amount of explosives used also tends to vary, making it difficult to reliably crush stones.

In addition, the above-mentioned conventional type has a weak part formed on the wall of the explosion chamber, but it is difficult to make this weak part partially strong and highly precise, and if the strength of this weak part is high, it will not cause an explosion. As a result, this fragile part cannot be destroyed reliably, and stone fragmentation becomes impossible.
Furthermore, if the fragile part was too weak, it would break if it hit a stone or the wall of a body cavity, and body cavity fluids and gas would enter the explosive in the explosion chamber, causing deterioration and making it impossible to detonate.

This invention was made based on these circumstances, and its purpose is to provide an intrabody cavity stone crushing device that does not cause deterioration of the explosive and is capable of reliably crushing the stone when it explodes. This is what we are trying to provide.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an example of a body cavity 2, for example, a bladder 2, through a channel (not shown) of the endoscope 1 shown in FIG.
The distal end portion of the crushing device inserted into is shown, and 3 is an insertion tube made of a flexible tube. A stator 4 made of an explosion-resistant material is attached to the tip of the insertion tube 3, and a cap 5 made of an explosion-resistant material is screwed onto the stator 4. An explosion chamber 6 is formed within the cap 5, and a through hole 7 is opened in the tip wall of the cap 5 to communicate the inside of the explosion chamber 6 with the outside. A plug 8 made of an electrically insulating material and having explosion resistance is inserted into the stator 4, and a detonation chamber 9 is formed in the plug 8 facing the explosion chamber 6. This detonator chamber 9 contains a detonator 10 such as a detonator.
, and a heating element 11 made of thin platinum wire, nichrome wire, or the like as a detonator is arranged. This heating element 11 is connected to conductive wires 12, 12
These conductive wires 12, 12 are led through the insertion tube 3 and connected to an external hand-operated unit (not shown), for example, an energizing switch. Explosives 13 are loaded in the explosion chamber 6. This explosive 13 is covered with a thin film 14 in a liquid-tight and air-tight manner. The thin film 14 is preferably made of a rubber material such as latex or silicone rubber, or a synthetic resin material such as polyethylene, polypropylene, or nylon (trade name), and in this embodiment, the film thickness is uniform over the entire circumference. . Note that if an elastic sheet is used, it will be easier to cover the explosive in close contact with the sheet. In the case of a synthetic resin sheet, it can also be used as a laminated plastic sheet in which powder or foil of aluminum, tin, etc. is mixed or embedded in a sandwich shape. Furthermore, the thin film 14 can be shaped like a thin container made of plastic or glass, and the explosive 13 can be filled inside to form a capsule shape.

The crushing device having such a configuration is introduced into the bladder 2 through the channel of the endoscope 1 inserted into the bladder 2, for example, as shown in FIG. Then, under direct vision through the endoscope 1, the distal end shown in FIG. . In this state, when you operate the hand control section of the crusher, that is, the switch, the conductor 1
2 and 12, the heating element 11 is energized, and the heating element 11 generates heat. The initiator 10 ignites with this heat generation, thereby burning the thin film 14 in the vicinity of the initiator 10 and igniting the explosive 13. As the explosive 13 explodes, it ruptures the other thin film 14, and the explosion energy saturates the explosion chamber 6 and is ejected from the through hole 7. Therefore, the explosion energy is concentrated and applied to the stone 16 facing the through hole 7, and this stone 16 is crushed. The crushed stone is removed from the body by natural excretion or forced outflow through the endoscope 1.

According to such a crushing device, since the explosive 13 is covered in advance with the thin film 14, it does not come into direct contact with moisture or gas, and therefore does not undergo deterioration due to chemical changes. In addition, such explosives 1
3, by measuring with high precision in advance and covering it with the thin film 14, it can be handled in the form of a capsule, and therefore the amount of explosive can be kept uniform even if it is a small amount. This reduces the variation in the amount of explosives. Because of this, a reliable explosion can be carried out and a certain amount of explosive energy can be obtained. And explosion chamber 6
is directly connected to the outside through the through hole 7, so
The explosion energy generated in the explosion chamber 6 is directly and concentratedly applied to the stone 16 through the through hole 7. Therefore, not only is it not necessary to process the fragile portion as in the conventional method, but also there is no loss of energy consumed by breaking the fragile portion, and the stone 16 can be reliably crushed. As described above, even if body fluid or gas enters through the through hole 7, the explosive 13 will not deteriorate because it is covered with the airtight and liquid-tight thin film 14.

Note that the present invention can be implemented even in a modified example as shown in FIG. That is, the thin film 20 made of this material is formed so that the film thickness of the parts 21 and 22 facing the through hole 7 and the detonating chamber 9, respectively, is particularly thin compared to the other remaining parts. In this way, even if the detonation energy is small, the explosive 1
Since the ignitability of 3 improves, the amount of detonator 10 is reduced, and since the explosive energy is concentrated from the thin walled portion 21 and goes toward the through hole 7, the explosive energy can be effectively applied to the concretion. Since the remaining thick-walled portion is relatively hard to be damaged, the inner surface of the explosive chamber 6 is less likely to be soiled, making it easier to clean the next time the explosive is charged, and extending the service life.

Furthermore, in the embodiment described above, the crushing device was introduced into the body cavity through the channel of the endoscope 1, and the stone crushing operation was performed under direct vision through the endoscope 1. The present invention is not limited to this, and it is also possible to directly insert and operate the crushing device into a body cavity under X-ray fluoroscopy.

In the present invention described in detail above, a through hole leading to the outside is provided in the wall of an explosive chamber, and an explosive coated with a thin film having airtightness and liquidtightness is loaded into the chamber. According to this device, the explosive is covered with a thin film that is air-tight and liquid-tight, so it does not come into contact with moisture or gas, and therefore does not undergo deterioration due to chemical reactions. In addition, by covering with a thin film, there is no risk of the explosives spilling during handling, and since they can be pre-measured with high precision and made into capsules, a predetermined amount of explosives can be used. As a result, a reliable explosion becomes possible and sufficient explosive energy is obtained. Since the explosion chamber communicates with the outside through a through hole, the explosive energy can be concentrated and effectively applied to the stone through the through hole, and the through hole is easy to process. It has the following effects.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a sectional view of the stone crushing device, Figure 2 being an explanatory diagram of its use, and Figure 3 being a sectional view of a modified example. be. 3...Insertion tube, 5...Cap, 6...Explosion chamber, 7...Through hole, 9...Detonation chamber, 10...Detonator, 11...Heating element, 13...Explosive, 14,20
...Thin film.

Claims (1)

[Claims] 1. An explosive chamber with a through hole leading to the outside is provided at the tip of the insertion tube inserted into the body cavity, and an explosive coated with an airtight and liquid-tight thin film is loaded into this explosive chamber. A device for crushing stones in a body cavity, characterized in that a detonator for igniting the explosive is provided.