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.
FIELD: medical engineering.
SUBSTANCE: device has ultrasonic surgical instrument manufactured as staged ampoule-type concentrator which cylindrical part of greater diameter is coupled with the ampoule-type part by means of a stage, is resonator fixed in sealed casing and has at least one electromechanical element of piezoelectric type with contact surfaces connected to power supply generator. The electromechanical element is mounted on the resonator end located oppositely with respect to the stage. The resonator is fixed in sealed casing by means of axial compression on the casing part. The force applied between the stage and outer contact surface of electromechanical element is equal to a=(0,35-0.65)λ, where λ is the wavelength of longitudinal elastic resonator displacement coincident wave.
EFFECT: reduced device weight; high surgical instrument fatigue strength.
2 cl, 1 dwg
FIELD: medical engineering.
SUBSTANCE: device has casing having anode fixed inside with insulation member. The anode is manufactured as brass rod having end piece fixed on its end and rubber sealing members and metal cassette connected to the casing head having cathode with end piece mounted inside of the casing head. The end pieces fixed in the anode and cathode are removable and composite as steel casings having rigidly fixed wolfram-containing inserts and damping units having damping units at attachment places. The cassette is manufactured as two heavy rods connected to each other with head member on one side and with threaded bushing, having damping member, on the other side.
EFFECT: reduced materials output ratio; prolonged service life.
7 cl, 2 dwg
FIELD: medicine, roentgenosurgery.
SUBSTANCE: one should simultaneously apply two opposite contralateral perfemoral accesses, introduce endovascular equipment retrogradely into femoral artery of the first inferior limb, perform therapy of stenosis in femoral artery being above the site of equipment introduction and in the arteries of the second inferior limb. Introducer should not be removed in the first limb, retrogradely one should introduce equipment into femoral artery of the second inferior limb to direct it through aortic bifurcation, then - by-passing the introducer being in the first limb, one should treat arterial stenosis in the first inferior limb. The method enables to decrease stress and medicinal loadings upon a patient and shorten the terms of patient's being in the hospital.
EFFECT: higher efficiency of therapy.
FIELD: medical engineering.
SUBSTANCE: device has electrode mounted in envelope having metal cylinder allowing electrode end to be introduced into its internal opening and to be engageable with basket end allowing pusher to pull it away.
EFFECT: enhanced effectiveness in crushing concrements to pieces; reduced risk of traumatic complications.
SUBSTANCE: device has external pipe, movable internal pipe and self-opening mechanism made in form of gates. Gates are strengthened by means of axes and hinge loops. External pipe and movable internal pipe are connected with self-opening mechanism in distal department. Hut-slider is disposed in proximal department. One side of nut-slider is connected with bushing of external pipe and the other side of the nut is connected with internal pipe by means of cylindrical screw. Screw passes though groove in external pipe. Square-shaped shank is disposed in proximal department for fitting electroscope in handle; light source fitting is also disposed in proximal department. Light source fitting is made for fixation of light-guide.
EFFECT: reduced traumatism during process of removal of foreign bodies; reduced number of complications.
1 ex, 3 dwg
FIELD: medicine; ophthalmology.
SUBSTANCE: phacoemulsifier can be used for extraction of cataract by means of phacoemulsification. Ultrasonic handle has casing and wave-guide disposed onto handle. Wave-guide has concentrator, multiple number of piezoelectric elements and clutching. There is aspiration channel in center of members mentioned before. There is cavity between casing and concentrator made for wash with irrigation solution. At least four gashes disposed symmetrically axis are made onto external surface of base. Widths of gashes equal to 0,5-1,0 mm. Operational and post-operational complications can be reduced due to efficient cooling of wave-guide and due to higher stability of ultrasonic oscillation system during process of generation of longitudinal oscillations.
EFFECT: reduced risk of complications; higher efficiency of operation.
3 dwg, 1 ex
FIELD: medical equipment.
SUBSTANCE: shock-wave pulse oscillator has capacitor. Controlled discharger is disposed inside capacitor as well as case with focusing system, disc inductor, irradiating membrane and aid for providing cavities with water under "water pillow". The aid is used to provide vacuum pressing of membrane against inductor to change curvature of inductor and membrane's surfaces and for provision of asymmetrical shock-wave beam. Lithotripsy and therapy procedures are performed due to complex match of geometrical characteristics of focusing lens to geometric and kinetic properties of irradiating membrane, and to pulse characteristics of discharge circuit.
EFFECT: improved efficiency.
4 cl, 3 dwg
FIELD: endoscope surgical instruments.
SUBSTANCE: instrument can be used for extracting concrements of gall-bladder duct. Conductor has radial rectangular curve. Instrument has tubular case inside which case the conductor is disposed. Conductor has handle at one end and gripping basket at the other one. Conductor is made in form of spring, lamellar and it is connected with basket, made of ropes, through connector. Basket is made in form of spoon, front part of basket is provided with tip. Ropes are made for extension and for formation of bag. Instrument is under full control of surgeon and it does not cause any trauma.
EFFECT: improved reliability; reduced time for concrement extraction.
2 cl, 2 dwg
FIELD: medicine, urology.
SUBSTANCE: one should affect ureteral area through ureteral projections with flicker-sound magnetic field, its spectral constituents being in the range of the following frequencies 2.5·10-4 - 2.5·101 Hz, and maximal amplitude of magnetic induction - within 0.1-0.5 mcTl. Duration of the procedure corresponds to about 30-60 min. The quantity of procedures - 1-3 daily. At detecting renal stones the diameter being above internal ureteral one should fulfill lithotrypsy before the impact with magnetic field. About 1-2 h before the impact with magnetic field it is necessary to introduce spasmolytic medicinal preparation. In the course of about 30-60 min before the impact with magnetic field and during this impact it is necessary to heat patient's body surface in area of ureteral projection. The innovation enables to shorten the duration of therapy.
EFFECT: higher efficiency.
3 cl, 3 ex