JPH07136187A - Bone crusher from outside of human body by impact wave in liquid - Google Patents

Abstract

PURPOSE:To enable the crushing of a human bone in a non-invasion manner from outside by arranging a plurality of fine pieces of powder on an axis vertical to a straight line connecting first and second focuses passing through a first focus of a rotary ellipse body to increase energy of an impact wave. CONSTITUTION:This apparatus is provided with an impact wave generation chamber 1 with the internal surface thereof so formed as to follow a part of a rotary ellipse body. a plurality of fine pieces 2 of powder for generating an impact wave and an igniter 3 for detonate these fine powder pieces 2 simultaneously. The fine powder pieces 2 are arranged in one row on the axis vertical to a straight line linking between focuses of the rotary ellipse body passing through a first focus, and the impact wave generated is propagated to a liquid 6 in a water tank 7 with the bottom thereof being formed by a flexible film 8. Then, the plurality of fine powder pieces 2 are detonated simultaneously to apply energy of an impact wave in a wide range centering the second focus on the axis vertical to a straight line linking the first and second focuses passing through the second focus, thereby crushing a human bone.

Description

Detailed Description of the Invention

[0001]

The present invention relates to the treatment of refractory bone fractures such as nonunion and the healing by crushing the bone tissue existing in the human body in the orthopedic region such as leg extension and osteotomy for correction. It relates to a device for the possible treatment.

[0002]

2. Description of the Related Art Conventionally, as a method for crushing or cutting bone tissue existing in the human body, an invasive method using a chisel or a saw is generally used. As a non-invasive method, attempts to treat bone fracture from outside the body by means of shock waves in the liquid have been carried out using an extracorporeal shock wave stone crushing device made to crush renal stones and gallbladder stones.

[0003]

According to the conventional apparatus for crushing extracorporeal shock wave calculi, it has been reported that the femur or humerus of a small animal such as a rat or a rabbit is crushed. There have been no reported cases of destruction of the femur or humerus. As described above, the femur bone of a large animal cannot be crushed by the conventional device because the shock wave energy required for crushing is insufficient.

Among the above-mentioned extracorporeal shock wave calculus crushing devices, there are a device using spark discharge and a device using minute explosive as a shock wave source. These have large shock wave energy, and in spark discharge, by increasing discharge voltage. In the case of micro explosives, the shock wave energy can be increased by increasing the dose.

However, increasing the shock wave energy by these methods to a level at which the human femur or humerus can be fractured causes the shock wave energy that has never been experienced until now to be converged to one point. There is a high possibility of adversely affecting living tissues such as nerves and nerves. Therefore, it is a technical object of the present invention to provide a method of increasing the total shock wave energy by suppressing the density of shock wave energy at the second focal point to the same extent as that of the extracorporeal shock wave calculus crusher.

[0006]

As a means for solving the above-mentioned problems, a method of simultaneously exploding a plurality of microexplosives near a first focal point of a spheroid is adopted, and a method of arranging a plurality of microexplosives is adopted. I decided to consider.

The method of arranging a plurality of micro explosives at the first focal point is the first on the axis connecting the first focal point and the second focal point as shown in FIG.
A method of arranging them in a line centering on the focal point, or a method of arranging them in a line centering on the first focal point on an axis perpendicular to a straight line passing through the first focal point and connecting the first focal point and the second focal point as shown in FIG. Be separated. As shown in Fig. 2, three micro explosives A1, B1, C1
Are arranged in one row so that B1 is at the first focus position of the spheroid, the shock wave generated by the explosion of microexplosives A1, B1, C1 is A2, B on the axis connecting the first focus and the second focus.
2. Focus on position C2. At this time, the position of B2 is the second
Be the focus. On the other hand, as shown in FIG.
When 3, B3, C3 are arranged in a row so that B3 is at the first focus position of the spheroid, microexplosives A3, B3, C3
The shock wave generated by the explosion of B is perpendicular to the straight line connecting the first focus and the second focus through the second focus, and is focused at the positions of A4, B4, and C4 on the axis parallel to the axis where the explosive is arranged at the first focus. To do. At this time, the position of B4 becomes the second focal point.

Since the object of the present invention is to apply shock wave energy to a large area of the bone surface, as shown in FIG.
It was decided to arrange a plurality of microexplosives in a line around the first focus on an axis perpendicular to a straight line passing through the focus and connecting the first focus and the second focus.

As described above, the first focus and the second focus are passed through the first focus.
On the axis perpendicular to the line connecting the focal points, a plurality of micro explosives are arranged in one row at regular intervals around the first focal point, and these micro explosives are simultaneously detonated to pass the second focal point and the first focal point. By giving shock wave energy in a wide range around the second focus on the axis perpendicular to the straight line connecting the second focus, the energy density can be suppressed to the same level as that caused by the explosion of one conventional micro explosive, and Shock wave energy can be increased.

[0010]

With the above-described device, the shock wave energy is increased by simultaneously initiating a plurality of minute explosives having the same amount of chemicals as those used in the conventional extracorporeal shock wave calculus crusher, thereby increasing the shock wave energy of the conventional extracorporeal shock wave. Human bones can be crushed from outside the body non-invasively with the same level of safety as a calculus crusher.

[0011]

EXAMPLES Examples of the present invention will be described below. As shown in FIG. 1, the apparatus has a shock wave chamber 1 whose inner surface is formed in the shape of a part of a spheroid, a micro explosive 2 for generating a shock wave, an ignition device 3 for simultaneously initiating the micro explosive 2, an ignition. A cable 4 for transmitting the output of the device 3 to the micro explosive 2, a pin 5 for arranging the micro explosive 2 at a predetermined position to house the cable 4, a liquid 6 for propagating a shock wave, a water tank 7 for containing the liquid 6, and a bottom surface of the water tank 7. Attached flexible membrane 8,
A circulation device 9 for removing bubbles and dust contained in the liquid 6;
The pad 10 is capable of absorbing shock waves. Again 11
Is a second focal point described for explanation, similarly 12 is a leg of a human body, and 13 is a bone of the human body.

In the above structure, the micro explosive 2 is shown in FIG.
As shown in (1), the spheroids are arranged in a line on an axis perpendicular to a straight line connecting the focal points and passing through the first focal point. Although the number of micro explosives 2 is three in FIGS. 1 and 3, it is two or three.
It may be more than one. For the micro explosive 2, silver azide is used.
The dose of each micro explosive is 10 mg. The types and doses of these micro explosives 2 are used in an extracorporeal shock wave calculus crushing device that has been conventionally used to crush kidney stones and gallbladder calculi in the human body, and their safety has been confirmed. Further, the interval between the minute explosives 2 is appropriately about 4 mm to 6 mm. A laser generator such as a ruby laser with a Q switch or a YAG laser with a Q switch can be used as the ignition device 3 for simultaneously initiating the micro explosive 2. In this case, the cable 4 can be an optical fiber cable. As the flexible film 8, a silicon rubber film or a urethane rubber film having a thickness of about 1 mm can be used. Water can be used as the liquid 6 for propagating the shock wave. However, it is necessary to remove air bubbles contained in water by the circulation device 9. Also,
The pad 10 is for preventing the shock wave passing through the human body from being reflected on the body surface, and can be made of a sponge containing water.

The procedure for using this device is as follows. First, the second focus 11 is guided to the position where the bone 13 should be fractured.
Next, the water tank 7 is filled with the liquid 6, and the flexible film 8 is placed on the human body 12.
Then, the circulation device 9 removes dust and bubbles contained in the liquid. The cable 4 is passed inside the pin 5, and the micro explosive 2 is attached to the tip. Cable 4 to ignition device 3
, The ignition device 3 is activated, and the micro explosive 2 is simultaneously detonated. The shock wave generated by the detonation is focused on the second focal point, and the bone 13 can be fractured.

[0014]

EFFECTS OF THE INVENTION According to the present invention, since the bone tissue of the human body can be crushed from outside the body, healing is promoted by crushing the bone tissue without resorting to open surgery with saws, fleas and the like. It is effective in treating non-union joints.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus for crushing bone from outside the body by shock waves in liquid according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method of arranging the microexplosive.

FIG. 3 is an explanatory diagram of a method of arranging the microexplosive.

[Explanation of symbols]

 1 Shock Wave Generation Chamber 2 Micro Explosive 3 Ignition Device 4 Cable 5 Pins 6 Liquid 7 Water Tank 8 Flexible Membrane 9 Circulating Device 10 Pat 11 Second Focus 12 Human Leg 13 Human Bone

Claims (1)

[Claims] 1. A shock wave generating chamber having an inner surface formed in a shape of a part of a spheroid and filled with a liquid, and a water tank provided with a flexible membrane for filling the liquid in the shock wave generating chamber. A straight line connecting a first focus and a second focus passing through a first focus of the spheroid located in the shock wave generating chamber, comprising a circulation device for removing bubbles and dust contained in the liquid in the water tank. A plurality of micro-explosives are arranged in a line on the axis perpendicular to the first focus center, and the micro-explosives are simultaneously exploded, and the generated shock wave is passed through the flexible membrane of the water tank to Through the second focus of the spheroid, the first
Bone from outside the body due to shock wave in liquid, characterized in that the bone of the human body at the second focal point is crushed into one line on the axis perpendicular to the line connecting the second focal point and the second focal point Crushing device.