Electromagnetic shock wave generator

 

(57) Abstract:

Usage: in medical devices, namely, devices for the destruction of kidney and gall stones. The inventive electromagnetic generator of shock waves, containing acoustic pickup lens of a polymeric material, a flat metal membrane, a flat spiral inductor coil connected to the pulse generator current, and an insulating spacer between the membrane and the inductor, with one lens surface is made flat and between it and the inductor is installed membrane, the coil is equipped with a cooling unit in the form of through-channels inside of the spiral coil, and the cooling unit membrane is made in the form of a hollow ring with a flat surface, which has thermal contact with the edge of the membrane, the site of the cooling coil can also be done in the form of a metallic disk, provided with a spiral channel, placed under the spiral coil and electrically connected with her in the center, with one end of the generator current pulses connected to the outer edge of the metal disk opposite conclusion spiral coil and turns of the spiral coils have a U-shaped profile and placed in the spiral groove of the housing inductivist lens metal coating, on top of which is coated with a layer of glycerin. Effect: increased efficiency of the device. 6 C. p. F.-ly. 2 Il.

The invention relates to techniques for converting electrical energy into sound energy pulses, in particular, shock waves, and can find application in biology, medicine, for example, for the destruction of kidney and gall stones.

Known emitters of sound pulses containing a spark gap connected through a managed key to the capacitive storage device and the reflector (U.S. Pat. US N 4715376, AND 61 IN 17/22, 1987).

The disadvantage of these devices is poor repeatability of the parameters of the sound pulses from discharge to discharge. In addition, the destruction of the electrodes of the spark arrester in the process severely limits its resource.

Closest to the claimed is an electromagnetic generator of shock waves, containing acoustic pickup lens of a polymeric material, a flat metal membrane, a flat spiral inductor coil connected to the pulse generator current, and an insulating spacer between the membrane and the inductor (U.S. Pat. US N 4901709, AND 61 IN 17/22, 1990).

This device provides high stabiles is itudy pressure at a moderate value of the charging voltage of the capacitive storage lead to the low efficiency of the damaging effects on the stones when used in lithotripsy. On the other hand with increasing discharge voltage to achieve higher pressure amplitude of the sound pulse having problems related to electrical strength, reliability and durability of the device and increase its value. In addition, in the known device between the membrane and the lens there is a gap filled with water. This leads to additional losses of energy by reflection of the sound pulse from the boundary surface between the lens and water, and to reduce device reliability due to possible water leaks, leading to disturbance of electric strength.

The aim of the invention is to improve the reliability and durability of the device, as well as increased efficiency.

This objective is achieved in that the electromagnetic generator of shock waves, containing acoustic pickup lens of a polymeric material, a flat metal membrane, a flat spiral inductor coil connected to the pulse generator current, and an insulating spacer between the membrane and the inductor serves one surface acoustic focusing lens to perform flat, membrane placed on the flat surface of the lens and pressed against the n is in the proposed device has the following additional characteristics.

Proposed site of the cooling coil to perform in the form of through-channels within the helical coil.

Features the coils of the helical coil to do with the U-shaped profile and put them in the spiral groove of the inductor, and the gap between the coils to fill epoxy compound.

Proposed site cooling the membrane to perform in the form of a hollow ring, a flat surface which is in thermal contact with the edge of the membrane.

Proposed site of the cooling coil to perform in the form of a metal disk provided with a spiral channel and placed near the spiral coil and electrically connected in the center, with one end of the generator current pulses connected to the outer edge of the metal disk, the opposite conclusion of the spiral coil.

Features the membrane to perform as deposited on a flat lens surface of the metallic coating.

Offered on a flat surface of the lens panel to put a layer of glycerin.

The positive effect of the proposed device is provided by direct contact of the membrane with the surface of the lens, this device eliminates the intermediate water layer m is acuautla introduced nodes cooling of the membrane and the inductor. Note that the inventive combination of features not identified in other known devices of similar purpose.

The invention is illustrated by drawings.

In Fig. 1 shows the device of Fig. 2 embodiment of a cooling coil with additional disk with spiral channels.

The device consists of an acoustic focusing lens 1, a metal membrane 2, the planar inductor 3, the spiral coil 4 connected to the pulse generator current 5. Between the membrane and the inductor padded insulating gasket 6. The membrane and the inductor is supplied with nodes cooling 7 and 8. For membranes, the cooling unit can be performed in the form of a hollow ring 7, a flat surface which is in thermal contact with the edge of the membrane. For inductor are two ways of performing cooling unit: Fig. 1, the cooling unit is made in the form of channels in the spiral coil is preferably U-shaped profile loop, and Fig. 2 cooling system of the inductor is made in the form of a disk 9, provided with a spiral channel. In the second embodiment, the drive is connected in the center of the coil, and with the edge with the generator current pulses across the output of the spiral coil. In this Suaeda or coolant, or gas.

The pulse generator current in the simplest version consists of a spark gap 10, a condenser 11, leads 12, 13. The pressing of the membrane to the surface of the lens is provided by, for example, screw connection 14.

The device operates as follows.

Capacitive drive 11 is charged from a constant voltage source (not shown). When applying the triggering pulse from the start block to the spark gap 10, the latter breaks the circuit consisting of the coil 4, a metal disk 9, the spark gap 10, a capacitor storage 11, is excited by a current pulse with an amplitude value I which creates near the membrane surface magnetic field with amplitude H. The pulse of magnetic pressure (H^2/8) t accelerates membrane, which causes the lens of the sound pulse. This pulse can be focused by the lens 1 in the focal zone of small dimensions.

The amplitude of the sound pulse is proportional to I^2, and the amplitude of the current is determined from the expression I U/(L/C)^0,5, where U is the charging voltage, L the inductance of the discharge circuit, With the capacity. Thus, reducing the inductance can increase the pressure amplitude of the sound pulse. From the expression LI2/2= (H2/8)dV, where V is the volume occupied by the magnetic field. This is achieved by introducing into the device metal disk 9. When the disc thickness greater than the thickness of the skin layer of a magnetic field does not penetrate into the external space and is concentrated in the gaps between the membrane and the coil and the metal screen and the coil. These gaps can be done a minimum, their thickness is limited by the magnitude of the breakdown voltage. The topology of the lines of current in the metallic screen due to the effect of "proximity" coincides with the topology of the streamlines in the spiral coil (in first approximation), so in the present device eliminates the uneven distribution of pressure caused by the asymmetry of the electrical power supply inherent in the known electromagnetic sources of sound impulses.

In known devices, the increase in pressure amplitude is the magnitude of the charging voltage. However, this raises the problem of providing electric strength of the device. The reliability of the device decreases with increasing magnitude of the charging voltage. This also applies to durability. In the proposed device the same pressure is achieved at a lower charging voltage than in the known devices, so it has higher reliability and dominula pressure, and it provides the breaking down of rocks into smaller fragments, i.e., increases the efficiency of the damaging effects.

Since the proposed device, the membrane is in direct contact with the surface of the lens, are excluded losses due to reflection of waves from the boundary between the lens surface and a liquid layer over the membrane, since this layer is excluded. In the process of working in the frequency mode, which is used in medical practice, there is a heating of the membrane in the gasket, which can lead to breakdown. Therefore, the membrane and the inductor is supplied with nodes cooling, which ensures normal temperature mode of the device.

The membrane should have good mechanical contact with the surface of the lens. This is ensured by the pressing membrane inductor. It is also possible embodiment of a membrane in the form of spray on the lens surface of the metal coating, for example, detonation, or by vacuum deposition. The further expansion of the metal layer, if necessary, can be achieved by electrochemical deposition.

Good acoustic contact between the membrane and the flat surface of the lens is provided with a layer of glycerin is the remaining number of fills in all mikroheranhvatho on a flat surface of the lens and provides a homogeneous excitation of the sound pulse at the shock of the membrane on the surface of the lens.

1. The ELECTROMAGNETIC GENERATOR of SHOCK WAVES, containing acoustic pickup lens of a polymeric material, a flat metal membrane, a flat spiral inductor coil connected to the pulse generator current, and an insulating spacer between the membrane and the inductor, wherein one surface of the acoustic lens is made flat, the membrane is placed on a flat surface of the lens and pressed against it by the inductor, the inductor and the membrane is provided with nodes cooling.

2. Generator under item 1, characterized in that the cooling unit of the inductor is made in the form of through-channels within the helical coil.

3. Generator for PP.1 and 2, characterized in that the turns of the spiral coils are designed with a U-shaped profile and placed in the spiral groove of the inductor, and the gap between the coils is filled with epoxy compound.

4. Generator for PP.1 to 3, characterized in that the cooling unit membrane is made in the form of a hollow ring with a flat surface, which has thermal contact with the edge of the membrane.

5. Generator for PP.3 and 4, characterized in that the cooling unit of the inductor is made in the form of a metal disk provided with a spiral channel posted Sov current is connected to the outer edge of the metal disk opposite conclusion spiral coil.

6. Generator for PP.1 to 5, characterized in that the membrane is made in the form deposited on a flat lens surface of the metallic coating.

7. Generator for PP. 1 to 5, characterized in that the flat lens surface is coated with the layer of glycerin.

 

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7 cl, 2 dwg

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EFFECT: higher efficiency of therapy.

1 ex

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FIELD: medicine, urology.

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EFFECT: higher efficiency.

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