DE8715901U1 - Lithotripter - Google Patents
LithotripterInfo
- Publication number
- DE8715901U1 DE8715901U1 DE8715901U DE8715901U DE8715901U1 DE 8715901 U1 DE8715901 U1 DE 8715901U1 DE 8715901 U DE8715901 U DE 8715901U DE 8715901 U DE8715901 U DE 8715901U DE 8715901 U1 DE8715901 U1 DE 8715901U1
- Authority
- DE
- Germany
- Prior art keywords
- shock wave
- wave generator
- lithotripter
- varistor
- shock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000035939 shock Effects 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000005855 radiation Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008058 pain sensation Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/04—Sound-producing devices
- G10K15/06—Sound-producing devices using electric discharge
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Surgical Instruments (AREA)
Description
87 G 3 4 7 &iacgr; DE ->87 G 3 4 7 &iacgr; EN ->
Lithotripter 5Lithotripters 5
Die Erfindung betrifft einen Lithotripter mit einem Stoßwellengenerator zur Aussendung von auf einen Fokusbereich ausgerichteten Stoßwellen, der über ein Schaltelement an einen Kondensator anschaltbar ist.The invention relates to a lithotripter with a shock wave generator for emitting shock waves directed at a focus area, which can be connected to a capacitor via a switching element.
Ein Lithntripter üblicher Sauart benotigt fur den Stoßwellengenerator Strome bis zu 20 KA bei Betriebsspannungen bis zu ^ 30 kV. Diese Energien werden in Stoßkondensatoren zwischenge-U speichert und über ein geeignetes Schaltelement an den Stoßwel-A lithium tripter of the usual type requires currents of up to 20 KA for the shock wave generator at operating voltages of up to 30 kV. This energy is temporarily stored in surge capacitors and fed to the shock wave generator via a suitable switching element. lengeneratiOr abgegeben. Um eine hochfrequentes gut fokussierbare Schallabstrählung zu erreichen, benötigt man einen schnellen Stromanstieg und ist deswegen bemüht, die Ersatzkreisinduktivität im Stromkreis des Stoßwellengenerators möglichst gering- zu halten. Im Falle eines geringen Ersatzkreiswiderstandes wirdIn order to achieve high-frequency, easily focusable sound radiation, a rapid current rise is required and efforts are therefore made to keep the equivalent circuit inductance in the circuit of the shock wave generator as low as possible. In the case of a low equivalent circuit resistance, sich nach Betätigung des Schaltelementes eine schnell abklingende Schwingung ausbilden. Die Abgabe solcher Pulse beanspruchen Stoßkondensator und Schaltelement im hohen Maße und führen zu einer geringen Lebensdauer. Außerdem wird der Stoßwellengenerator mit der Abstrahlung von für Patient und Generatorafter the switching element is activated, a rapidly decaying oscillation is formed. The emission of such pulses places a high load on the surge capacitor and switching element and leads to a short service life. In addition, the shock wave generator is exposed to radiation for the patient and generator. schädlichen Unterdruckpulsen und mit der Abgabe von niederen ( ) Spektralanteilen belastet, welche aufgrund ihrer schlechtenharmful negative pressure pulses and the emission of low ( ) spectral components, which due to their poor Fokusslerbarkelt wenig zur Steinzertrümmerung, dafür aber mehr zur Schmerzempfindung beitragen. Die Optimalanregung eines Lithotripters ist ein möglichst kurzandauernder Unipolar-Strom«Focusslerbarkelt contributes little to the stone fragmentation, but more to the sensation of pain. The optimal stimulation of a lithotripter is a unipolar current that is as short as possible. puls.Pulse.
Der Erfindung liegt die Aufgabe zugrunde, einen Lithotripter der eingangs genannten Art so auszubilden, daß der den Stoßwellengenerator speisende Strom einem Unipolar-Strompuls weitgehend angenähert ist.The invention is based on the object of designing a lithotripter of the type mentioned at the beginning in such a way that the current feeding the shock wave generator is largely approximated to a unipolar current pulse.
Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß zwischen Tp 2 Ler / 25.11.1987This object is achieved according to the invention in that between Tp 2 Ler / 25.11.1987
87 G 3 4 7 &iacgr; D£87 G 3 4 7 &iacgr; D£
dem Kondensator und dem Stoßwellengenerator ein Varistor eingeschaltet ist. Ein Varistor, also ein spannungsabhängiger Widerstand, bildet eine anfänglich zum Zeitpunkt großer Strome kleine und anschließend bei kleineren Strömen stärker werdende Dämpfung, weil er einen mit fallendem Strom steigenden ohm1 sehen Widerstand hat. Ein Varistor ist impulsbelastungsfest und hat Freiwerdezeiten im Bereich von wenigen ns. Besonders SlC-Varistoren weisen auch unter Stoßbelastung hohe Energieabsorptionsfähigkeit und Dauerstandfestigkeit auf. Außerdem lassen sie sich beliebig parallel und in Reihe schalten und sind somit fur beliebig hohe Strome und Spannungen verwendbar.A varistor is connected between the capacitor and the shock wave generator. A varistor, i.e. a voltage-dependent resistor, forms an attenuation that is initially small at the time of large currents and then becomes stronger at smaller currents because it has an ohm 1 s resistance that increases as the current falls. A varistor is resistant to impulse loads and has release times in the range of a few ns. SLC varistors in particular have a high energy absorption capacity and fatigue strength even under shock loads. In addition, they can be connected in parallel and in series as required and can therefore be used for any high currents and voltages.
Die Erfindung ist nachfolgend anhand eines in der Zeichnung \_/ dargestellten Ausfuhrungsbeispieles näher erläutert.The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawing \_/.
In der Zeichnung ist ein Stoßkondensator 1 dargestellt, der einen Stoßwellengenerator 2 über einen Schalter 3 speist. Der Stoßkondensator 1 wird vor der Erzeugung einer Stoßwelle aufgeladen. Zur Stoßwellenerzeugung wird der Schalter 3, der z.B. eine Funkenstrecke, ein Thyratron, ein Ignitron oder ein Thyristor sein kann, geschlossen und der Stoßkondensator 1 entlädt sich über die Ersatzkreisinduktivität 4, den Ersatzkreiswidnrstan^ 5 und einen Varistor 6 in den Stoßwellengeneratpr 2 zur Erzeugung einer Stoßwelle. Der Varistor 6, der auch von der 25 Zusammenschaltung mehrerer einzelner Varistoren 6a, 6b gebildet (~~) sein kann (siehe gestrichelte Darstellung), formt den Stromimpuls in der oben geschilderten Weise.The drawing shows a surge capacitor 1 which feeds a shock wave generator 2 via a switch 3. The surge capacitor 1 is charged before a shock wave is generated. To generate a shock wave, the switch 3, which can be a spark gap, a thyratron, an ignitron or a thyristor, is closed and the surge capacitor 1 discharges via the equivalent circuit inductance 4, the equivalent circuit resistance 5 and a varistor 6 into the shock wave generator 2 to generate a shock wave. The varistor 6, which can also be formed by the interconnection of several individual varistors 6a, 6b (see dashed illustration), forms the current pulse in the manner described above.
Der SteBweliengenerätöf 2 kann ein pieze-keramischer Senden, ein Wirbelstromsender, eine Unterwasserfunkenstrecke oder ein Impulslaser sein.The spark generator 2 can be a piezo-ceramic transmitter, an eddy current transmitter, an underwater spark gap or a pulsed laser.
Die in der Zeichnung dargestellte Schaltung ist Teil eines f Lithotripters zur Behandlung von Konkrementen im Körper eines „ 35 Patienten. Die vom Stoßwellengenerator 2 ausgesandten Stoßwellen werden In bekannter Weise z.B. mit Hilfe einer akustischenThe circuit shown in the drawing is part of a lithotripter for the treatment of concretions in the body of a „ 35 patient. The shock waves emitted by the shock wave generator 2 are in a known manner, e.g. with the help of an acoustic
•.'..&igr; &igr; &iacgr;•.'..&igr;&igr;&iacgr;
87 8 3 ^ 7 f DE87 8 3 ^ 7 f EN
• ··
**- - . ··· ' · Ml III IM« it » **- - . ··· ' · Ml III IM« it »
( Linse auf einen Fokusbereich gebündeltf in dem das Konkrement zur Zertfüirtmerung angeordnet wird* ( Lens focused on a focus area in which the concretion is arranged for crushing*
2 Schutzänsprücfie i Figur 2 Protection claims in Figure
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8715901U DE8715901U1 (en) | 1987-12-01 | 1987-12-01 | Lithotripter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8715901U DE8715901U1 (en) | 1987-12-01 | 1987-12-01 | Lithotripter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE8715901U1 true DE8715901U1 (en) | 1989-03-30 |
Family
ID=6814653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8715901U Expired DE8715901U1 (en) | 1987-12-01 | 1987-12-01 | Lithotripter |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE8715901U1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0702350A3 (en) * | 1994-09-17 | 1998-12-30 | Richard Wolf GmbH | Driving circuit for a soundpulse source |
DE19916891C1 (en) * | 1999-04-14 | 2000-08-31 | Siemens Ag | Equipment for generating acoustic waves incorporates a switching device and a high-voltage capacitor to be discharged by this switching device |
-
1987
- 1987-12-01 DE DE8715901U patent/DE8715901U1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0702350A3 (en) * | 1994-09-17 | 1998-12-30 | Richard Wolf GmbH | Driving circuit for a soundpulse source |
DE19916891C1 (en) * | 1999-04-14 | 2000-08-31 | Siemens Ag | Equipment for generating acoustic waves incorporates a switching device and a high-voltage capacitor to be discharged by this switching device |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1517757B1 (en) | Switching circuit for an electromagnetic source for the generation of acoustic waves | |
EP0911804B1 (en) | Method for the automatic adjustment of the distance between the electrodes of a spark gap in electrohydraulic shock wave generators | |
EP0308644A2 (en) | Focusing ultrasonic transducer | |
EP0300315B1 (en) | Shock wave generator for an apparatus for non-contact disintegration of concrements, present in a body | |
EP0252397B1 (en) | Connection cable between a pulse generator and a shock wave generator | |
EP0421286B1 (en) | Piezoelectric transducer | |
DE2635635C3 (en) | Spark gap for generating shock waves for the contact-free destruction of calculus in the bodies of living beings | |
DE102009041329A1 (en) | Combined Ultrasonic and HF Surgical System | |
DE3715822A1 (en) | METHOD FOR THE AUTOMATIC CARDIO VERSION AND CARDIO VERSION SYSTEM | |
DE3146628A1 (en) | "RELEASE DEVICE FOR SHOCK WAVES FOR THERAPEUTIC PURPOSES" | |
EP0209053A2 (en) | Method and apparatus for the non-contacting disintegration of concretions in a living body | |
DE3312014A1 (en) | Device for the contactless crushing of concrements in the body of living beings | |
EP0590177B1 (en) | Shock-wave generating apparatus for non-invasive destruction of concrements in living bodies | |
DE3506362A1 (en) | LASER DEVICE AND METHOD FOR GENERATING CONTROLLED MULTIPLE LASER IMPULSES | |
DE2650624C2 (en) | Device for smashing concretions in the body of a living being | |
DE8715901U1 (en) | Lithotripter | |
DE69630848T2 (en) | Implantable cardiac defibrillation device for defibrillation with low energy pulses | |
EP0240797B1 (en) | Shockwave generator with increased efficiency | |
DE2118938A1 (en) | Pulse generator | |
DE2921444A1 (en) | Non-invasive destruction of kidney stones - uses device with annular reflector and insulating support in focal line, having HV terminals and electrode segments | |
DE68906734T2 (en) | DENTAL LASER. | |
DE10207737C1 (en) | Acoustic wave generation circuit has diode or diode module connected in parallel across HV capacitor | |
DE3146627C2 (en) | Circuit for generating an electrical discharge in the nsec range | |
DE3702120A1 (en) | PAIN-FREE CRUSHING | |
EP0244730A1 (en) | Device for smashing concretions present in a living body |