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EP4341010A1 - Générateur d'ultrasons d'alimentation en énergie électrique pour fragmenter des calculs, dispositif de lithotripsie, système de lithotripsie et procédé d'identification d'une sonotrode - Google Patents

Générateur d'ultrasons d'alimentation en énergie électrique pour fragmenter des calculs, dispositif de lithotripsie, système de lithotripsie et procédé d'identification d'une sonotrode

Info

Publication number
EP4341010A1
EP4341010A1 EP22737642.3A EP22737642A EP4341010A1 EP 4341010 A1 EP4341010 A1 EP 4341010A1 EP 22737642 A EP22737642 A EP 22737642A EP 4341010 A1 EP4341010 A1 EP 4341010A1
Authority
EP
European Patent Office
Prior art keywords
sonotrode
ultrasonic generator
frequency
voltage
measuring
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.)
Pending
Application number
EP22737642.3A
Other languages
German (de)
English (en)
Inventor
Bernhard Glöggler
Thomas Hinding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Karl Storz SE and Co KG
Original Assignee
Karl Storz SE and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Karl Storz SE and Co KG filed Critical Karl Storz SE and Co KG
Publication of EP4341010A1 publication Critical patent/EP4341010A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
    • A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/90—Identification means for patients or instruments, e.g. tags
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/90—Identification means for patients or instruments, e.g. tags
    • A61B90/98—Identification means for patients or instruments, e.g. tags using electromagnetic means, e.g. transponders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00022—Sensing or detecting at the treatment site
    • A61B2017/00026—Conductivity or impedance, e.g. of tissue
    • A61B2017/0003—Conductivity or impedance, e.g. of tissue of parts of the instruments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00477—Coupling
    • A61B2017/00482—Coupling with a code
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
    • A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
    • A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
    • A61B2017/22014—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being outside patient's body; with an ultrasound transmission member; with a wave guide; with a vibrated guide wire
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
    • A61B2017/320098—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with transverse or torsional motion

Definitions

  • Ultrasonic generator for supplying electrical power for crushing body stones, lithotripsy apparatus, lithotripsy system and method of identifying one
  • the invention relates to an ultrasonic generator for supplying electrical power to break up body stones, with at least one sonotrode being assigned to the ultrasonic generator and the at least one sonotrode being detachably connectable to the ultrasonic generator, and the ultrasonic generator having a vibration exciter for exciting a Resonant vibration is assigned to at least one sonotrode and the vibration exciter can be excited by supplying an AC voltage using the ultrasonic generator with a vibration frequency. Furthermore, the invention relates to a lithotripsy device for breaking up and/or removing bodily stones, a lithotripsy system and a method for identifying a sonotrode.
  • Lithotripsy is a well-known method for breaking up body stones, which form as so-called calculus in body organs, for example in the bladder or kidneys, as a result of the crystallization of salts. If the body stones are too large to be passed naturally and are causing discomfort, they must be crushed using a lithotripter so that the crushed stones are removed by natural excretion and/or using a suction-irrigation pump.
  • the stones in the body are broken up by means of shock waves, which, in addition to lasers and pneumatic energy sources, are usually generated by means of ultrasound.
  • the shock wave is emitted at the distal end of a sonotrode.
  • the electrical power supplied by an ultrasonic generator must be on the one hand be adapted to the respective sonotrode in order to avoid overloading the sonotrode, and on the other hand be sufficient to break up stones.
  • Various sonotrodes are connected to an ultrasonic generator either one after the other or depending on the organ to be treated and regulatory requirements. In practice, this often means that the ultrasonic generator always delivers only the lowest power so that no sonotrode is overloaded. As a result, however, the existing potential is not utilized in the case of more resilient sonotrodes and work is ineffective with regard to stone fragmentation.
  • WO 2019/141821 A1 discloses a system for breaking up and/or removing bodily stones, in which shock waves and/or ultrasonic waves are transmitted from a source via an interface to a reversibly connectable probe, the probe being an identification element , such as a ring with an RFID chip.
  • the identification element is designed separately and must be arranged on and/or in the probe so that it is protected from vibration.
  • the ring element encases the probe in the assembled state, confusion can also occur during assembly.
  • the status information transmitted by means of the RFID element is limited to the number of permitted uses of the probe.
  • the object of the invention is to improve the prior art.
  • the object is achieved by an ultrasonic generator for supplying electrical power to break up bodily stones, with at least one sonotrode being assigned to the ultrasonic generator and the at least one sonotrode being detachably connectable to the ultrasonic generator, and the ultrasonic generator having a vibration exciter for exciting a reso nancial oscillation is assigned to the at least one sonotrode and the oscillation exciter can be excited by supplying an AC voltage using the ultrasonic generator with an oscillation frequency, the ultrasonic generator having a measuring device for measuring a specific resonance frequency of the at least one sonotrode, so that in the case of connection the specific resonance frequency of the at least a sonotrode can be determined by means of the measuring device and/or the at least one sonotrode can be identified on the basis of the determined specific resonance frequency.
  • a sonotrode detection is provided by determining their specific resonant frequency by means of the measuring device of the ultrasonic generator. Not only is each individual sonotrode clearly identifiable by means of the measuring device, but by determining the specific resonance frequency, the electrical power supplied by the ultrasonic generator can be adapted directly to the determined specific resonance frequency. As a result, the sonotrode can always be operated optimally in such a way that its resonant frequency matches the frequency made available by the ultrasonic generator used matches. As a result, optimal power is delivered to break up body stones without damaging the sonotrode.
  • the ultrasonic generator enables an advantageous detection of the current state of the sonotrode in real time.
  • the sonotrode does not have to be replaced after a specified, limited number of uses, but is actually determined and monitored. This means that the sonotrode detection using the measuring device of the ultrasonic generator can also be used for internal and/or external quality assurance.
  • each sonotrode has a different specific resonant frequency, which can be determined using the measuring device of the ultrasonic generator is.
  • the ultrasonic generator can be used to identify which respective sonotrode is being used in order to limit or increase the power accordingly, in order to avoid damage to this sonotrode and/or the horn and to fully utilize the potential for shattering. Damage to the sonotrode, such as a fracture or crack, can be detected immediately by means of the measuring device, because this changes the vibration behavior and/or the resonant frequency of the sonotrode.
  • a bent sonotrode can also be identified by its altered vibration behavior and can be replaced before it is used directly on or in the body. Consequently, by means of the ultrasonic generator, an optimal and safer operation of the sonotrode can be realized directly and in real time, in which a maximum permissible energy input with maximum shattering performance is made possible.
  • An essential idea of the invention is that by integrating a measuring device directly in the ultrasonic generator, the respective specific resonant frequency is determined as an inherent parameter of a sonotrode and an identification of the sonotrode and a recognition of its current status with regard to the planned and /or an application that has just started and an optimal power supply to the sonotrode is enabled during this application.
  • An "ultrasonic generator” is in particular an electrical device for supplying an AC voltage to a vibration exciter to generate a resonance vibration in a sonotrode.
  • the ultrasonic generator has in particular a power supply unit, a sine wave generator and/or a transforming transformer of the AC voltage.
  • the ultrasound generator is generated in particular an AC voltage with variable ble amplitude and / or frequency.
  • the "sine wave generator” (also called “signal generator”) is in particular an electronic device, assembly or circuit that generates an electrical voltage with a characteristic time curve.
  • the AC voltage generated has in particular a special frequency in a range from 20 kHz to 90 kHz, preferably from 20 kHz to 34 kHz.
  • the signal generator of the ultrasonic generator is in particular electrically connected to the vibration exciter.
  • the electrical power supplied by the sine generator determines in particular the amplitude and thus the oscillation deflection of the sonotrode.
  • Body stones (also called “calculus”) are understood to mean, in particular, all stones in a human or animal body that form from salts through crystallization. Stones in the body can be, for example, gallstones, urinary stones, kidney stones and/or salivary stones.
  • a "sonotrode” is in particular a component which is caused to resonate by introducing high-frequency mechanical vibrations by means of the vibration exciter.
  • the sonotrode is designed in particular as a waveguide for the ultrasonic waves generated by the vibration exciter this optimally introduces the ultrasonic vibrations at its distal end to smash body stones into the body and/or the region of the body.
  • a longitudinal oscillation is preferably generated with the sonotrode
  • the sonotrode has in particular steel, titanium, aluminum and/or carbon.
  • a "horn” is in particular a component which is arranged between the vibration exciter and the sonotrode.
  • the horn is used in particular to forward the ultrasonic waves generated by the vibration exciter to the sonotrode and/or to align them.
  • the horn can also be used to attach the sonotrode.
  • the horn in particular together with a counter bearing, serves to mechanically hold the vibration exciter on both sides.
  • a "vibration exciter” is in particular a component of an ultrasonic transducer and/or handpiece of a lithotripsy device, which converts the supplied AC voltage at a specific frequency into a mechanical vibration frequency.
  • the vibration exciter is in particular an electromechanical transducer using the piezoelectric Effect. By applying the electrical AC voltage generated by the ultrasonic generator, a mechanical vibration is generated due to a deformation of the vibration exciter.
  • the vibration exciter has in particular one piezo element or several piezo elements.
  • the vibration exciter preferably has at least two piezo elements, with an electrical conductor between the piezo elements for example a copper disc, is arranged.
  • An "AC voltage” is, in particular, an electrical voltage whose polarity changes at regular intervals.
  • a “frequency” is in particular a measure of how quickly the repetitions follow one another in a periodic process.
  • the frequency is in particular the reciprocal value of the period duration.
  • the frequency indicates in particular the number of periods of the AC voltage which occur in one second
  • a "resonance frequency” is, in particular, a frequency when the sonotrode is excited, at which the amplitude increases more strongly than when excited with neighboring frequencies.
  • the resonant frequency is in particular that frequency at which the amplitude of a forced oscillation is at a maximum. If a sonotrode has a number of natural frequencies, then in particular it has a number of natural frequencies local maxima of the forced amplitude and thus several resonant frequencies.
  • the “measuring device” is in particular a device, a component and/or several components with which the specific resonant frequency of the sonotrode within the ultrasonic generator is measured.
  • the ultrasonic generator is or are assigned a second sonotrode, a third sonotrode, a fourth sonotrode and/or further sonotrodes, the sonotrodes each having a specific, different resonant frequency.
  • the second, third, fourth and/or further sonotrodes have in particular the function defined above, but differ in their embodiment.
  • the sonotrodes usually have a different overall length and/or an outside diameter.
  • a different vibration behavior can also be brought about by the material used in each case, a structural change, for example by hardening and/or a surface coating, so that there is a different specific resonance frequency for the respective sonotrode.
  • the vibration behavior can also be set in a targeted manner by changing the sonotrode geometry, for example by introducing a transverse bore or a groove.
  • the ultrasonic generator has a control and/or regulating device so that one of the ultrasonic electrical power that can be supplied by the generator can be adapted to the specific resonant frequency of the respective sonotrode.
  • the optimum AC voltage can be automatically supplied to the ultrasonic transducer and/or the sonotrode by the control and/or regulating device based on the specific resonant frequency determined by means of the measuring device, without user intervention being necessary.
  • the type of application e.g. the destruction of salivary stones in the head area or kidney stones, can be specified by the user on the ultrasonic generator, which directly determines the maximum electrical power that can be supplied based on this specification and the specific resonance frequency in the ultrasonic generator and is adjusted accordingly by means of the control and regulating device.
  • the adaptation of the electrical power that can be supplied can also be linked to other conditions and functions.
  • the electrical power supplied can be automatically throttled by means of the control and/or regulating device if the rinsing-suction pump fails during use, only to a limited extent within a certain time interval works and/or the sonotrode overheats.
  • overheating of the sonotrode is specifically detected via a drift in the resonance frequency during use.
  • a "control device” is understood in particular to mean a device which sets a predetermined value.
  • a “regulating device” is understood in particular to mean a device which feeds back a measured value and sets a control value in each case.
  • a definable frequency range of the AC voltage can be traversed by means of the control and/or regulating device, so that several resonant frequencies of the respective sonotrode can be determined.
  • a predetermined range of frequencies for example from 23 kHz to 33 kHz, is run through in a short time interval of, for example, 10 seconds.
  • the ultrasonic generator then starts again at 23 kHz or sets the optimum frequency automatically.
  • several existing resonances vibration states and/or vibration modes
  • the frequency and/or the passable frequency range theoretically corresponds to the vibration frequency and/or the passable vibration frequency range of the vibration exciter. This means that a very small voltage generated in the ultrasonic generator is transformed to a high voltage simply by means of a transformer for transfer to the ultrasonic transducer and/or the sonotrode, but the frequency is not changed in the process.
  • the measuring device has an electronic scanning unit for measuring a time profile of a voltage and a time profile of a current, with the frequency being used to measure the specific resonant frequency or resonant frequencies can be adjusted by means of the control and/or regulating device in such a way that a phase shift exercise of the time curves of the voltage and the current is zero.
  • An "electronic scanning unit” is in particular an electronic measuring device that records an electrical voltage or several electrical voltages over time, digitizes them and/or makes them visible on a screen.
  • the electronic scanning unit has in particular at least two channels.
  • the electronic scanning unit does not necessarily have to have a screen for visualizing the chronological sequences, but rather this data can be recorded and/or recorded directly internally within the control and/or regulating device and/or a data storage and/or data processing unit of the ultrasonic generator
  • An electronic scanning unit can be an oscilloscope, in particular a digital oscilloscope, in which case the oscilloscope can be integrated in the ultrasonic generator or assigned to it.
  • the measuring device has a resistor and/or a current measuring clamp for measuring the course of the current over time.
  • the measuring device measures the voltage directly
  • the voltage drop is measured in a second channel of the electronic scanning unit via a resistor, which corresponds to the current, or by means of a current measuring clamp on the connection. connection line between the sine wave generator and the vibration exciter within the ultrasonic generator was measured.
  • the ultrasonic generator and/or the measuring device has a data storage and/or data processing unit in which previously determined resonance frequencies of the associated sonotrode or sonotrodes can be stored.
  • the object is achieved by a lithotripsy device for crushing and / or removing body stones, the lithotripsy device having a hand-held device with a vibration exciter and a sonotrode that can be connected to the hand-held device on the distal side and a sonotrode Has ultrasonic generator, wherein the ultrasonic generator is electrically connected to the hand-held device, and the ultrasonic generator is an ultrasonic generator previously described.
  • a lithotripsy device in which the power supplied for breaking up bodily stones can be automatically adjusted by means of the ultrasonic generator and the quality of the sonotrode used can be checked automatically before and/or during use.
  • a lithotripsy device can in particular be an intracorporeal or extracorporeal lithotripsy device.
  • the hand-held device of the lithotripping device is designed as an endoscope or ultrasonic transducer, each with a sonotrode.
  • this can additionally have a rinsing/suction pump.
  • At least one piezo element is arranged as a vibration exciter between a counter bearing arranged on the proximal side and a horn arranged on the distal side and is mechanically coupled to the counter bearing and the horn, with the sonotrode being connectable to the horn on the distal side.
  • the vibration exciter and/or the at least one piezo element are thus operated in resonance with the horn and the sonotrode.
  • the abutment arranged on the proximal side has a function as a reflector for the ultrasonic waves generated by the piezoelectric element or the piezoelectric elements. Due to the design of the counter bearing and/or the horn, generated transverse and rotational vibrations as well as generated longitudinal vibrations can be directed optimally to the distal end (close to the body to be treated) of the sonotrode for breaking up bodily stones.
  • an electrically conductive element is arranged on the at least one piezo element and/or between two piezo elements, which element is electrically connected to the ultrasonic generator.
  • a mechanical deformation can be imposed on the piezo element or elements by means of the alternating voltage transmitted, and the specific resonant frequency of the sonotrode can also be measured through the electrical connection using the measuring device of the ultrasonic generator.
  • the horn in particular is also electrically connected to the ultrasonic generator.
  • the object is achieved by a lithotripsy system for breaking up and/or removing bodily stones, the lithotripsy system having a lithotripsy device as described above and a plurality of sonotros.
  • a lithotripsy system with two or more sonotrodes is thus provided for the user, with the sonotrode connected to the ultrasound generator being clearly identifiable and optimally operable, and a quick changeover to another sonotrode being able to be implemented.
  • the object is achieved by a method for identifying a sonotrode and/or for the optimized supply of electrical power for breaking up bodily stones by means of an ultrasonic generator with a measuring device, with the following steps:
  • a method is thus provided with which a sonotrode is reliably identified, its operating state and suitability for operation are determined in real time, and an optimized supply of electrical power for crushing bodily stones is made possible.
  • the generator cannot resolve the type of vibration detected, i.e. whether it is, for example, a longitudinal vibration or a bending vibration
  • further measurements can be carried out at the factory using a high-resolution microscope or laser vibrometer as an optical measuring device to determine the vibration shape are carried out and these and the associated frequencies are stored so that they can be called up in order to differentiate between the actual vibration states.
  • a definable frequency range of the AC voltage is passed through during measurement, so that several resonance frequencies of the sonotrode can be determined.
  • the specific resonance frequency or frequencies is or are measured before and/or during the crushing of bodily stones by means of the sonotrode.
  • the measurement of the specific resonance frequency or resonance frequencies is carried out within a period of time in a range from 0.01 sec to 50 sec, in particular 0.5 sec to 5 sec, preferably 0.1 sec to 2 sec , accomplished.
  • FIG. 1 shows a schematic representation of a lithotripsy device with an ultrasonic generator and a connected ultrasonic transducer
  • FIG. 2 shows a schematic representation of a circuit diagram of an alternative ultrasonic generator
  • FIG. 3 shows a schematic representation of a method for identifying a sonotrode with the associated method steps
  • FIG. 4 shows a schematic representation of an ultrasonic transducer with a screwed-on sonotrode and longitudinal oscillation
  • FIG. 5 shows a schematic representation of the ultrasonic transducer from FIG. 4 with a torsional vibration.
  • a lithotripsy device 100 has an ultrasonic generator 101 and an ultrasonic transducer 131, which are electrically connected to one another by means of a high-voltage cable 130 (FIG. 1).
  • the ultrasonic generator 101 has a Power supply 103, a sine wave generator 111, a measuring device 113, a control device 119, a data processing device 121 and a transformer 127.
  • the ultrasonic transducer 131 is designed as a handpiece.
  • the transmitter 127 can also be arranged directly in the ultrasonic converter 131 designed as a handpiece, so that the high-voltage cable 130 is not necessary in this case.
  • the ultrasonic transducer 131 has a housing 133 in which an abutment 139 is arranged on the inside on the proximal side, then two piezoelectric elements 141 are arranged separated by a copper disk 143 and a horn 135 is arranged on the distal side.
  • a sonotrode 137 is arranged on the distal end face of the horn 135 .
  • the power pack 103 of the ultrasonic generator 101 has a galvanic isolation 107 between a primary mains voltage (90 to 240 V AC) and a low voltage. From the low voltage, the sine wave generator generates an AC voltage as low voltage 123 with a variable amplitude and variable frequency in a range from 20 to 34 kHz.
  • the transformer 127 has a galvanic isolation 125 between this AC voltage as a low voltage 123 and a transformed high voltage 129 for operating the ultrasonic transducer 131, such as 400 V, with the frequency set by the sine generator 111 in the range of 20 to 34 kHz at the transmission is preserved.
  • a measuring device 113 is arranged in front of the transformer 127 in a low-voltage line 123 and has a channel for measuring the voltage 117 and for measuring the current.
  • a current measuring clamp 115 is arranged for the current measurement.
  • the measuring device 113 is connected to the control device 119, via which the AC voltage 123 generated by the sine wave generator 111 can be controlled with the variable amplitude and/or frequency.
  • the ultrasonic transducer 131 and thus the sonotrode 137 are connected via the high-voltage cable 130 to the ultrasonic generator 101 (FIG. 3).
  • the AC voltage 123 generated by the sine wave generator 111 with a frequency of 30.0 kHz is fed via the transformer 127 as high voltage 129 to the piezo elements 141 via the copper disc 143 (step 505). Due to the resulting deformation of the piezoelectric elements 141, which are clamped between the proximal-side counter bearing 139 and the distal-side horn 135, an ultrasonic vibration is induced, causing a resonance vibration of the connected sonotrode 137 to be excited (step 507).
  • a specific resonant frequency of the sonotrode 137 within the ultrasonic generator 101 is measured by means of the measuring device 113 (step 509).
  • the frequency of the alternating voltage 123 is reduced by the sine wave generator 111 until the voltage measurement 117 and the current measurement by means of the current measuring clamp 115 are in phase and resonance is present.
  • the resonant frequency determined is 27.0 kHz and corresponds to a previously determined resonant frequency of this sonotrode 137 which is stored in the data processing device 121 . This comparison between the determined resonant frequency and the previously stored resonant frequency results in an identification 511 of the sonotrode 137.
  • the associated maximum permissible electrical power which is also stored in the data processing device 121, is 50 W and is used by the control device 119 directly on the sine generator 111 for a subsequent optimal shattering of bodily stones is set by means of the ultrasonic transducer 131, the frequency of the alternating voltage 123 being adjusted (step 513).
  • a sine wave generator 211 is connected via a resistor 215 to two piezo elements 241 of a handpiece (see circuit diagram in FIG. 2).
  • the circuit across resistor 215 has a parallel first electronic sensing channel 216 for measuring a voltage drop across resistor 215, thereby determining the current.
  • the voltage is measured directly via a second electronic scanning channel 217 .
  • the piezo elements 241 are connected to a first sonotrode (not shown).
  • a frequency range of 23 kHz to 33 kHz is traversed within 25 seconds by means of the alternating voltage generated by the sine wave generator 211. If the measured voltage and current are in phase, the corresponding resonant frequency is recorded.
  • a second sonotrode and a third sonotrode are then connected one after the other and, as described above, the frequency range from 23 to 33 kHz is run through again to determine the respective different resonance frequencies. Table 1 shows the resonant frequencies determined.
  • an ultrasonic transducer 331 with a horn 335 and a sonotrode 337 screwed to it has a longitudinal oscillation 345, with the sonotrode 337 oscillating back and forth along its mechanical axis (FIG. 4 shows a simulation of this state).
  • An ultrasonic transducer 431 with a horn 435 and a screwed-on sonotrode 473 in FIG. 5 is the same system as in FIG. 4. However, there is a torsional vibration 445 of the sonotrode 437. However, the ultrasonic generator 101 with its measuring device 113 cannot differentiate between a longitudinal vibration, as shown in FIG. 4, and a torsional vibration, as shown in FIG. Table 2 lists the vibration forms and natural frequencies of the sonotrode 337 with the longitudinal vibration 345 and the structurally identical sonotrode 437 with the torsional vibration 445, with pairs of bending modes each being combined under a common mean natural frequency.
  • the various modes and thus oscillation states of the sonotrodes 337 and 437 are specified, with individual modes being relatively close together, even if the structural design of the ultrasonic transducer 331, 431 places the greatest possible frequency spacing between the target modes and the neighboring modes.
  • the position of the different modes can also be used to differentiate between the sonotrodes 337, 437 and thus for identification.
  • the actual vibration state can be measured using an optical measuring device, such as a high-resolution microscope or laser vibrometer, in addition to the method described above , such as a longitudinal vibration or a bending vibration, can be determined.
  • an optical measuring device such as a high-resolution microscope or laser vibrometer

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Abstract

L'invention concerne un générateur d'ultrasons d'alimentation en énergie électrique pour fragmenter des calculs, le générateur d'ultrasons étant associé à au moins une sonotrode et l'au moins une sonotrode pouvant être raccordée de manière amovible au générateur d'ultrasons, et le générateur d'ultrasons étant associé à un vibreur pour exciter une vibration de résonance de l'au moins une sonotrode et le vibreur pouvant être excité à une fréquence de vibration par fourniture d'une tension alternative au moyen du générateur d'ultrasons, le générateur d'ultrasons comprenant un équipement de mesure pour mesurer une fréquence de résonance spécifique de l'au moins une sonotrode de sorte que, dans le cas d'une connexion, la fréquence de résonance spécifique de l'au moins une sonotrode puisse être déterminée au moyen de l'équipement de mesure et/ou de l'au moins une sonotrode sur la base de la fréquence de résonance spécifique déterminée. En outre, l'invention concerne un dispositif de lithotripsie, un système de lithotripsie et un procédé d'identification d'une sonotrode.
EP22737642.3A 2021-07-07 2022-07-06 Générateur d'ultrasons d'alimentation en énergie électrique pour fragmenter des calculs, dispositif de lithotripsie, système de lithotripsie et procédé d'identification d'une sonotrode Pending EP4341010A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021117569.0A DE102021117569A1 (de) 2021-07-07 2021-07-07 Ultraschallgenerator zum Zuführen einer elektrischen Leistung zum Zertrümmern von Körpersteinen, Lithotripsievorrichtung, Lithotripsiesystem und Verfahren zum Identifizieren einer Sonotrode
PCT/EP2022/068706 WO2023280905A1 (fr) 2021-07-07 2022-07-06 Générateur d'ultrasons d'alimentation en énergie électrique pour fragmenter des calculs, dispositif de lithotripsie, système de lithotripsie et procédé d'identification d'une sonotrode

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EP4341010A1 true EP4341010A1 (fr) 2024-03-27

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EP22737642.3A Pending EP4341010A1 (fr) 2021-07-07 2022-07-06 Générateur d'ultrasons d'alimentation en énergie électrique pour fragmenter des calculs, dispositif de lithotripsie, système de lithotripsie et procédé d'identification d'une sonotrode

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EP (1) EP4341010A1 (fr)
DE (1) DE102021117569A1 (fr)
WO (1) WO2023280905A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE4040537C3 (de) 1990-02-02 1998-05-20 Olympus Optical Co Ultraschallbehandlungsvorrichtung
US6626926B2 (en) 2000-10-20 2003-09-30 Ethicon Endo-Surgery, Inc. Method for driving an ultrasonic system to improve acquisition of blade resonance frequency at startup
DE102007048595B3 (de) 2007-10-10 2009-02-26 Ruwisch, Dietmar, Dr. Vorrichtung zur Bestimmung des Verankerungszustandes einer implantierten Endoprothese
US9504471B2 (en) * 2013-09-25 2016-11-29 Cybersonics, Inc. Ultrasonic generator systems and methods
DE102018101221B4 (de) 2018-01-19 2023-05-17 Ferton Holding S.A. System zum Zertrümmern und/oder Entfernen von Körpersteinen und Verfahren zum Bereitstellen eines derartigen Systems
DE102018113261A1 (de) 2018-06-04 2019-12-05 Olympus Winter & Ibe Gmbh Elektrochirurgisches System, sowie Ultraschallgenerator und Ultraschallinstrument dafür

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