JPS6320076A - Shock wave source - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shock wave source with a straight focus that intersects the propagation direction of the emitted shock wave pulse.

[Conventional technology]

In the medical field, the 4i11 wave source constitutes the main part of, for example, a kidney stone crusher. In order to fragment a kidney stone, shock wave pulses are introduced into the patient's body from outside through the stone medium. This shock wave pulse is usually focused on the area of the stone.

If the stones are long or juxtaposed, it is advantageous to use a shock wave source with a straight focus.

Such shock wave sources are known, for example, from German Patent No. 3417985, column 4, lines 36 to 5.
It is written on line 0. It is stated in this patent specification that it is advantageous to use an axial straight focus instead of a point focus. Further, in this patent specification, a focal point extending perpendicular to the direction of propagation of the shock wave requires a magnitude of shock wave energy proportional to the area of the front surface when the pressure amplitudes at the focal point are equal;
It is stated that this significantly increases the load on the electrodes that generate the shock waves, and also significantly increases the burden on the user. Similarly, in the ignition electrode-assisted Li bombardment source used here, side effects occur, for which the formation of a straight focus transverse to the direction of propagation of the shock wave pulse has traditionally been evaluated as a drawback. Ta.

So-called shock wave tubes with a diaphragm and a flat coil are described, for example, in German Patent Application No. 33
It is known from the publication No. 28051. A flat coil having a spherical concave surface and used in lithotripters is known from German Utility Model No. 8413031 (Utility Model Application No. 6O-17521).

[Problem that the invention seeks to solve]

The present invention provides that a straight focus transverse to the direction of propagation is advantageous without the use of firing electrodes in the shock wave source and therefore expensive consumables, and that when the stone is located transverse to the direction of propagation of the shock wave, the concretion is simultaneously The starting point is that nine-day injections can provide shorter treatment times, less patient burden, and higher economic efficiency.

The invention therefore aims at configuring a shock wave source of the type mentioned at the outset in such a way that a relatively long-lived shock wave source without ignition electrodes is used to generate a straight point intersecting the direction of propagation. do.

[Means for Solving the Point of Conflict] According to the first configuration of the present invention, the above object is achieved by using a diaphragm, which is known per se, and a diaphragm, which is known per se, and a diaphragm per se for generating a shock wave pulse in Nm. This is achieved by providing a known flat coil and forming the flat coil into a cylindrical concave shape.

The above object is achieved according to a second embodiment of the invention by providing a diaphragm, known per se, a flat coil, known per se, for electromagnetically generating a shock wave response, and arranged after this diaphragm. This is achieved by including an acoustic lens formed into a cylindrical concave surface.

The above object is achieved according to a third configuration of the invention in that two juxtaposed shock wave generators with point foci are provided, whose main directions of irradiation are aligned substantially parallel to each other. be done.

〔Effect of the invention〕

In addition to the known advantages of a straight focus, such as a large effective range, in the shock wave source according to the invention there are advantages resulting from the omission of an ignition field. This is particularly important, for example, for kidney stone crushers. A flat coil can be energized with a voltage pulse that is only slightly larger than that of a point focus. That is, for example, according to experiments, in order to form a 16aB focal area of 811TI11 at a point focal point, 15
However, even though the focal range of 16 dB has been expanded from 8 m to approximately 40 M at the linear point, when a cylindrical concave lens is used, the voltage is reduced from the above 15 kV. Increasing it to 19kV has proven to be sufficient. This relatively small voltage rise does not create any shortcomings regarding the lifespan of the flat coil and does not continue to burden the patient receiving the shockwave energy. Nevertheless, the effectiveness of the lithotripter is significantly increased and therefore less treatment time is required.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a cross-sectional view of an embodiment of a shock wave source for a kidney stone crusher, which has a lens with cylindrical concave surfaces on both sides. In this FIG. 1, a shock wave generator 1 is shown with a lens 3 placed behind it. This shock wave generation H1
They are known per se and consist, for example, of a circular coil separated by an insulating sheet and in front of which a circular copper diaphragm is arranged. When a high voltage pulse is applied to the flat coil, the copper diaphragm is impulsively moved forward based on the 'lt force. A shock wave pulse is thereby generated, which is transmitted to the lens 3 via the coupling medium. Such a shock wave generation B1 has a point-like focal point.

The lens 3 here consists of a cylindrical concave cut lens on both sides and extends slightly in a direction perpendicular to the plane of the paper. Note that the lens 3 may be formed into a cylindrical concave surface only at its entrance surface 3a or its exit surface 3b.A conductive section filled with water is provided between the lens 3 and the body of the fool P to be treated. 5 is provided, the conducting section 5 being closed off by a sealing diaphragm 7. The sealing diaphragm 7 is brought into contact with the patient P without intervening air bubbles. What is important here is that the lens 3 does not produce a point focus, but a linear focus extending perpendicular to the central propagation direction Z.

The shock wave generator 1 and the lens 3 together constitute a shock wave source having a central axis Z. In order to change the position of the linear focus, the lens 3 is rotatable about this central axis Z. This rotation can be effected, for example, by a semicircular gear 9 meshing with a pinion 11, in which case the gear 9 is fixed to the lens 3 and the pinion 11 is
: 'Fixed to the container wall of the MJ wave source (1, 3).

Binion 1 along arrow 13, for example by manual operation.
1, the lens 3 and therefore the linear focus L
rotates around the central axis Z. Furthermore, a slide head 15 is provided, which slide head 15 is accommodated in a groove in the container of the shock wave generator and can be moved in the direction of the arrow 17, for example also by manual operation. By moving the slide head 15, the lens 3 can be moved away from or closer to the shock wave generator 1. In this way, the linear focus can be moved along the central axis Z. The rotation of the linear focus makes it possible to cause the shock wave pulse to follow the treatment area each time the position of the treatment area is changed. In other words, the rotation makes it possible to avoid irradiation of particularly sensitive areas.

In that case, the attached position measuring device (not shown)
It is preferable to provide linear focus positioning in imaging systems.

FIG. 2 is a sectional view showing a second embodiment of a shock wave source having a flat coil formed on a cylindrical concave surface. A flat coil 22 having a cylindrical concave surface is provided on the flat coil support 20 . In this case, the flat coil 22 is designed in particular according to the shape shown in FIGS. 3 to 5. In front of the flat coil 22 is a diaphragm 24 separated by an insulating sheet.
is located. This diaphragm 24 has its peripheral edge pressed against the flat coil support 20 by means of a fixed flange 26 . In this case, a shock wave source is shown in which the focusing device is integrally formed. When a voltage pulse is applied, the diaphragm 24 is impulsively pushed apart based on the above-mentioned li (fi force), which immediately generates a shock wave pulse, which is focused in a straight line, that is, perpendicular to the plane of the paper. In this case, it is likewise advantageous to design the shock wave source so that it is rotatable about its central axis Z, to align it with the treatment position, and to avoid irradiating particularly sensitive areas of the patient. be.

3 to 5, it is used as a flat coil to generate a shock wave pulse having a rectangular cross section in combination with the cylindrical concave lens of FIG. 1, or as shown in FIG. 2. A flat coil 2, which is used directly as a rectangular flat coil curved into a cylindrical concave shape.
3A, 23B.

The preferred shape of 23C is shown. Figure 3 shows a single spiral wound into a rectangular shape. FIG. 4 shows a spiral shape wound into an elliptical shape. FIG. 5 shows two square spirals arranged in parallel and in particular electrically connected in parallel to form one rectangular coil.

FIG. 6 shows a developed view of the shock wave source for concrete explanation. A diaphragm 34 separated by an insulating sheet (not shown) is placed in front of the coil support 30 to which a two-part rectangular flat coil 33 is attached. This diaphragm 34 has a fixed flange 36
is pressed against the coil support 30 in the assembled state. Behind the fixed flange 36 is arranged an elongated lens 38 having a cylindrical concave shape. lens 3
A resilient sealing diaphragm 40 is provided between 8 and the patient (not shown). The shock wave source once again has a central axis Z and is rotatable along the arrow 13. By rotating the shock wave source, the linear focus transverse to the direction of propagation Z can be matched to the geometry of the patient's stone to be disrupted.

The shock wave source shown can be used not only in the field of lithotripters, but also wherever shock wave irradiation is carried out in medicine.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing another embodiment of the invention, Fig. 3 is a plan view of a rectangular flat coil, and Fig. 4 is a sectional view of an elliptical coil. FIG. 5 is a plan view of the formed flat coil, FIG. 5 is a front view of a flat coil with two juxtaposed square spirals, and FIG. 6 is a developed view of a rectangular shock wave source with a cylindrical concave lens. DESCRIPTION OF SYMBOLS 1... Shock wave generator, 3... Lens, 3a... Incident surface, 3b... Output surface, 5... Conduction section, 7...
Sealed diaphragm, 9... Gear, 11... Pinion, I5... Slide head, 20... Flat coil support, 22° 23A, 23B, 23C... Flat coil, 24... Diaphragm , 26... Fixed flange, 30... Coil support, 33... Flat coil, 36... Fixed flange, 38... Lens,
40... Sealed diaphragm, L... Linear focus, P.
...Patient, Z...Central axis. I01 IG2 I03 23C IG5 IG4

Claims (1)

[Claims] 1) In a shock wave source having a linear focus intersecting the propagation direction of the emitted shock wave pulse, a diaphragm (24)
and a flat coil (22) for electromagnetically generating shock wave pulses, the flat coil (22) having a cylindrical concave shape. 2) The shock wave source according to claim 1, wherein the flat coil (23B) has an elliptical shape. 3) The shock wave source according to claim 1, wherein the flat coils (23A, 23C, 33) have a rectangular shape. 4) The shock wave source according to claim 3, wherein the flat coil (23C, 33) is composed of two spirals arranged in parallel and electrically connected in parallel. 5) The shock wave source according to any one of claims 1 to 4, characterized in that the shock wave source is rotatable about its central axis (Z). 6) At the shock wave source with a straight focus intersecting the direction of propagation of the emitted shock wave pulse, a diaphragm (24)
A shock wave source comprising: a flat coil (22) for electromagnetically generating shock wave pulses; and an acoustic lens (3) arranged after the diaphragm and formed into a cylindrical concave surface. 7) The shock wave source according to claim 6, wherein the flat coil (23B) has an elliptical shape. 8) The shock wave source according to claim 6, wherein the flat coils (23A, 23C, 33) have a rectangular shape. 9) The shock wave source according to claim 8, wherein the flat coil (23C, 33) is composed of two spirals arranged in parallel and electrically connected in parallel. 10) Any one of claims 6 to 9, wherein the lens (3, 38) has an entrance surface (3a) and an exit surface (3b) formed in a cylindrical concave surface. Shock wave source according to item 1. 11) The shock wave source according to any one of claims 6 to 10, wherein the flat coils (23, 33) are formed in a flat shape. 12) Shock wave source according to any one of claims 6 to 11, characterized in that the shock wave source is rotatable about its central axis (Z). 13) Shock wave source according to any one of claims 6 to 11, characterized in that the lens (3) is rotatable about its central axis (Z). 14) In a shock wave source with a straight focus intersecting the propagation direction of the emitted shock wave pulse, two juxtaposed shock wave generators (1) with point foci are provided, their main emission directions substantially parallel Shock wave sources characterized in that they are aligned with each other. 15) Claim 14, characterized in that each shock wave generator (1) comprises a diaphragm and a flat coil.
Shock wave source as described in section.