WO2019234485A1 - Ensemble transducteur - Google Patents

Ensemble transducteur Download PDF

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Publication number
WO2019234485A1
WO2019234485A1 PCT/IB2018/059348 IB2018059348W WO2019234485A1 WO 2019234485 A1 WO2019234485 A1 WO 2019234485A1 IB 2018059348 W IB2018059348 W IB 2018059348W WO 2019234485 A1 WO2019234485 A1 WO 2019234485A1
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WO
WIPO (PCT)
Prior art keywords
waves
assembly
waveform
wsg
wave
Prior art date
Application number
PCT/IB2018/059348
Other languages
English (en)
Inventor
Shankar Trichur RAMCHANDRAN
Jaishree Trichur RAMCHANDRAN
Lakshmi Iyer
Ramchandran Shankarshastri TRICHUR
Original Assignee
Ramchandran Shankar Trichur
Ramchandran Jaishree Trichur
Lakshmi Iyer
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.)
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Publication date
Application filed by Ramchandran Shankar Trichur, Ramchandran Jaishree Trichur, Lakshmi Iyer filed Critical Ramchandran Shankar Trichur
Publication of WO2019234485A1 publication Critical patent/WO2019234485A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
    • A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
    • A61B8/4494—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer characterised by the arrangement of the transducer elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N7/00—Ultrasound therapy
    • 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
    • B06B1/0644—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 using a single piezoelectric element
    • B06B1/0655—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 using a single piezoelectric element of cylindrical shape
    • 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • 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
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general
    • 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
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
    • 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
    • G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N7/00—Ultrasound therapy
    • A61N2007/0056—Beam shaping elements
    • A61N2007/006—Lenses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N7/00—Ultrasound therapy
    • A61N2007/0056—Beam shaping elements
    • A61N2007/0069—Reflectors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N7/00—Ultrasound therapy
    • A61N2007/0073—Ultrasound therapy using multiple frequencies

Definitions

  • the present disclosure relates generally to shaping and focusing of waves in general, e.g., sonic waves and ultrasound waves, and particularly to a transducer assembly capable of targeting specific harmful microbes that are airborne and/or on surface in an enclosed environment to effectively inhibit and/or control growth of the harmful microbes.
  • Ultrasound is routinely used for diagnostics and as a physio-therapy device. It is also well established that ultrasound has the ability to penetrate cell membranes of unicellular organisms. Ultrasound has been used for anti-microbial activity in liquid medium but most of the disease-causing microbes are airborne. Airborne ultrasound can target microbes in enclosed environment that are airborne (microbes floating around in the air) and on surfaces (like on furniture, flooring, walls, utilities, electronic devices, etc.).
  • the numerical parameters set forth in the written description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment.
  • the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable. The numerical values presented in some embodiments of the invention may contain certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
  • An object of the present disclosure is to provide a transducer assembly for generating a waveform that creates a vibrational environment to target, limit and control microbes in the environment that are harmful to multi-cellular organisms.
  • Another object of the present disclosure is to provide a transducer assembly to shape as well as transmit the conical waveform generated thereof.
  • the present disclosure relates to transducer assembly to generate a waveform with sonic artefacts, and more particularly for generating a waveform comprising a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • present disclosure elaborates upon a transducer assembly that can include: a primary wave generation and shaping section (first section) configured to generate multi -frequency primary standing waves (first set of waves); and a secondary wave shaping and scattering section (second section) configured to generate secondary standing waves (second set of waves) upon receipt of the first set of waves, and emit and scatter a multi-beam multi-direction ultrasound waveform.
  • first section configured to generate multi -frequency primary standing waves
  • second section configured to generate secondary standing waves (second set of waves) upon receipt of the first set of waves, and emit and scatter a multi-beam multi-direction ultrasound waveform.
  • the first section can include: a piezo crystal configured to generate primary sweeping waves of multiple resonant frequencies spanning sonic and ultrasound (ultrasonic) frequency ranges based upon received signals, wherein the piezo electric crystal can have a flat band response for the multiple resonant frequencies; and a cavity resonator configured to tune and lock-in the primary sweeping waves to generate the first set of waves, and compensate for resonant frequency tolerances of the piezo electric crystal.
  • the piezo crystal can have an ultrasound range of 20 KHz to 100 KHz, and a sonic range of 1.5 Hz to 20 KHz.
  • the piezo crystal can include a metal substrate disc arranged concentrically with a crystal compound disc.
  • the cavity resonator can include a hollow cylinder with both ends capped, and the piezo electric crystal can be positioned at one end of the cylinder.
  • diameter of the hollow cylinder can vary from 30 millimetres (mm) to 40 mm (to vary amplitude of the primary sweeping waves), and height of the hollow cylinder can vary from 5 mm to 9 mm (to vary transmission beam angle of the primary sweeping waves).
  • the second section can include: a conical reflector; and a multi-direction wave scatter grill (WSG), wherein the conical reflector and the WSG can be so configured that the first set of waves can generate the second set of waves as they traverse through the conical reflector and the WSG, and wherein interaction and cross talk between the first set of waves and the second set of waves can produces a third set of waves (secondary waves) that can be sliced at appropriate angles at the WSG to generate the waveform that propagates conically.
  • WSG multi-direction wave scatter grill
  • the conical reflector can shape the secondary waves and can determine their transmission beam angle.
  • the piezo crystal can be placed at focal area of the conical reflector.
  • adjusting focal length of the conical reflector can influence transmission beam angle of the secondary waves.
  • the WSG can scatter the waveform and can give any or a combination of square, round and rectangular shape to the waveform.
  • the waveform can include a plurality of beams, wherein number of the plurality of beams and intensity of the plurality of beams can be determined based upon diameter and number of holes in the WSG.
  • wave-scatter coverage of the plurality of beams can be determined based upon surface area of the WSG.
  • the received signals can include a combination of :a first signal that, when fed to the piezo crystal, can generate a first ultrasound sweep carrier wave (first wave); and a second signal that, when fed to the piezo crystal, can generate bursts of a second ultrasound wave at a pre-determined sonic frequency ( second wave), and the primary sweeping waves that can be generated by the piezo electric crystal upon receipt of the first signal and the second signal can include a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • first wave first ultrasound sweep carrier wave
  • second wave pre-determined sonic frequency
  • the waveform can include a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • the waveform upon usage in a defined physical space, can enable any or a combination of: inhibiting microbial growth by targeting microbes harmful to multi-cellular organisms such as human beings, the microbes being any or a combination of airborne microbes and surface microbes; slowing colony formation reduction for any or a combination of bacteria comprising Klebsiellapneumoniae, E cob, Salmonella, pseudomonas, Salmonella typhi, Listeria, Methicillin-resistant Staphylococcus aureus (MRSA), Methicillin- Sensitive Staphylococcus aureus (MSS A), Nontuberculousmycobacteria (NTM), Mycobacterium tuberculosis (MTB) Staphylococcus aureus, and Mycobacterium Chelonea (NTM); slowing anti-fungal growth for any or a combination of Mould - Aspergillusniger and Yeast - Candida albicans;
  • MRSA Methicillin-resistant
  • FIGs. 1A through 1C illustrate perspective view, front view and a sectional view of section A-A of the cavity resonator of proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • FIGs. 2A through 2C illustrate exemplary perspective view, rear view and a sectional view of section B-B of the piezo crystal of the proposed transducer assembly respectively in accordance with an exemplary embodiment of the present disclosure.
  • FIGs. 3A through 3B show exemplary front view and a sectional view of section C-C of the conical reflector of the proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • FIGs. 4A through 4C illustrate exemplary perspective view, front view and side view of wave scatter grill of the proposed transducer assembly respectively in accordance with an exemplary embodiment of the present disclosure.
  • FIG. 5A illustrates an exemplary exploded view of the proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure
  • FIG. 5B illustrates an exemplary conical waveform generated by proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • FIG. 6A shows percentage reduction in various bacteria on steel and plastic surfaces when exposed to waveform generated by proposed transducer assembly
  • FIG.6B shows percentage reduction in various fungi on steel and plastic surfaces when exposed to waveform generated by proposed transducer assembly, in accordance with exemplary embodiments of the present disclosure.
  • FIG. 7A illustrates antibacterial efficacy of waveforms generated by proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • FIG. 7B illustrates antifungal efficacy of waveforms generated by proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • FIGs. 8A to 8C illustrate results of microbial test over surface of food samples to evaluate reduction of microbial load on such surfaces upon treatment with waveforms generated by proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • FIGs. 9A to 9C illustrate results of surface swab test over different surfaces to evaluate reduction of microbial load on such surfaces upon treatment with waveforms generated by proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • FIG. 10 illustrates reduction of microbial load in the air upon treatment with waveforms generated by proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • Embodiments of the present invention may incorporate hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof.
  • the program code or code segments to perform the necessary tasks may be stored in a machine-readable medium.
  • a processor(s) may perform the necessary tasks.
  • units / components of proposed device elaborated herein are only exemplary units and any other unit or sub-unit can be included as part of the proposed device. These units too can be merged or divided into super-units or sub-units as may be configured.
  • present disclosure elaborates upon a transducer assembly that can include: a primary wave generation and shaping section (first section) configured to generate multi -frequency primary standing waves (first set of waves); and a secondary wave shaping and scattering section (second section) configured to generate secondary standing waves (second set of waves) upon receipt of the first set of waves, and emit and scatter a multi-beam multi-direction ultrasound waveform.
  • first section configured to generate multi -frequency primary standing waves
  • second section configured to generate secondary standing waves (second set of waves) upon receipt of the first set of waves, and emit and scatter a multi-beam multi-direction ultrasound waveform.
  • the first section can include: a piezo crystal configured to generate primary sweeping waves of multiple resonant frequencies spanning sonic and ultrasound (ultrasonic) frequency ranges based upon received signals, wherein the piezo electric crystal can have a flat band response for the multiple resonant frequencies; and a cavity resonator configured to tune and lock-in the primary sweeping waves to generate the first set of waves, and compensate for resonant frequency tolerances of the piezo electric crystal.
  • the piezo crystal can have an ultrasound range of 20 KHz to 100 KHz, and a sonic range of 1.5 Hz to 20 KHz.
  • the piezo crystal can include a metal substrate disc arranged concentrically with a crystal compound disc.
  • the cavity resonator can include a hollow cylinder with both ends capped, and the piezo electric crystal can be positioned at one end of the cylinder.
  • diameter of the hollow cylinder can vary from 30 millimeters (mm) to 40 mm (to vary amplitude of the primary sweeping waves), and height of the hollow cylinder can vary from 5 mm to 9 mm (to vary transmission beam angle of the primary sweeping waves).
  • the second section can include: a conical reflector; and a multi-direction wave scatter grill (WSG), wherein the conical reflector and the WSG can be so configured that the first set of waves can generate the second set of waves as they traverse through the conical reflector and the WSG, and wherein interaction and cross talk between the first set of waves and the second set of waves can produces a third set of waves (secondary waves) that can be sliced at appropriate angles at the WSG to generate the waveform that propagates conically.
  • WSG multi-direction wave scatter grill
  • the conical reflector can shape the secondary waves and can determine their transmission beam angle.
  • the piezo crystal can be placed at focal area of the conical reflector.
  • adjusting focal length of the conical reflector can influence transmission beam angle of the secondary waves.
  • the WSG can scatter the waveform and can give any or a combination of square, round and rectangular shape to the waveform.
  • the waveform can include a plurality of beams, wherein number of the plurality of beams and intensity of the plurality of beams can be determined based upon diameter and number of holes in the WSG.
  • wave-scatter coverage of the plurality of beams can be determined based upon surface area of the WSG.
  • the received signals can include a combination of : a first signal that, when fed to the piezo crystal, can generate a first ultrasound sweep carrier wave (first wave); and a second signal that, when fed to the piezo crystal, can generate bursts of a second ultrasound wave at a pre-determined sonic frequency ( second wave), and the primary sweeping waves that can be generated by the piezo electric crystal upon receipt of the first signal and the second signal can include a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • first wave first ultrasound sweep carrier wave
  • second wave pre-determined sonic frequency
  • the waveform can include a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • the waveform upon usage in a defined physical space, can enable any or a combination of: inhibiting microbial growth by targeting microbes harmful to multi-cellular organisms such as human beings, the microbes being any or a combination of airborne microbes and surface microbes; slowing colony formation reduction for any or a combination of bacteria comprising Klebsiellapneumoniae, E coli, Salmonella, pseudomonas, Salmonella typhi, Listeria, Methicillin-resistant Staphylococcus aureus (MRSA), Methicillin- Sensitive Staphylococcus aureus (MSS A), Nontuberculousmycobacteria (NTM), Mycobacterium tuberculosis (MTB) Staphylococcus aureus, and Mycobacterium Chelonea (NTM); slowing anti-fungal growth for any or a combination of Mould - Aspergillusniger and Yeast - Candida albicans;
  • MRSA Methicillin-resistant
  • Embodiment explained herein relates to a transducer assembly capable of targeting specific harmful microbes that are airborne and/or on surface in enclosed environment to effectively inhibit and control growth of the harmful microbes.
  • FIGs. 1A through 1C illustrate perspective view, front view and a sectional view of section A-A of the cavity resonator of proposed transducer assemblyin accordance with an exemplary embodiment of the present disclosure.
  • the cavity resonator 100 can tune and lock-in the primary sweeping waves to generate multi -frequency primary standing waves (first set of waves).
  • the primary standing waves are formed by interference of at least two waves of identical frequency with one another while travelling in opposite directions along the same medium.
  • the cavity resonator 100 can generate multi -frequency sweeping primary standing waves by shaping/tuning at least a portion of the primary sweeping waves.
  • the primary sweeping waves generated by the piezo crystal (shown as 200 in FIG. 2 A) traverse through the cavity resonator 100 and when waves emitted by the piezo crystal and waves reflected by the cavity resonator 100 intersect, primary standing waves are formed.
  • the cavity resonator 100 can have a plurality of slots 102 to allow electrical connection of the piezo crystal 200 with a waveform/wave pattern/wave signal generating device with the help of wires traversing through the slots 102. In this manner, piezo crystal 200 can generate waves of different types.
  • the cavity resonator 100 can tune and lock-in dynamic sweep frequencies of the primary sweeping waves resulting in the multi -frequency sweeping primary standing waves.
  • a piezo crystal 200 (as shown in FIG. 2A) can be coupled to one end of the cavity resonator 100, thereby making the cavity resonator 100 a hollow cylinder with both ends capped.
  • diameter of the cavity resonator 100 can range between 30 millimeters (mm) and 40 mm. Amplitude of the primary sweeping waves can be modulated by changing diameter of the cavity resonator 100. In an embodiment, height of the cavity resonator 100 can range between 5 mm and 9 mm, which can be adjusted to modulate transmission beam angle of the primary sweeping waves. The cavity resonator 100 can compensate for any tolerances of resonant frequency of the piezo crystal 200.
  • diameter of the hollow cylinder can vary from 30 millimeters (mm) to 40 mm (to vary amplitude of the primary sweeping waves), and height of the hollow cylinder can vary from 5 mm to 9 mm (to vary transmission beam angle of the primary sweeping waves).
  • FIGs. 2A through 2C illustrate exemplary perspective view, rear view and a sectional view of section B-B of the piezo crystal of the proposed transducer assembly respectively in accordance with an exemplary embodiment of the present disclosure.
  • the piezo crystal 200 can include a metal substrate disc 202 arranged concentrically with a crystal compound disc 204 that can contain crystal elements, such as, quartz, Rochelle salt and other ceramic as well as non-ceramic materials.
  • the metal substrate disc 202 can be coupled with the crystal compound disc 204 by a fastening technique, such as, adhesion, welding, fitting and the likes.
  • the piezo crystal 200 can generate the primary sweeping waves that can include bursts of sonic waves having, either variable or specific periodicity encapsulated by low frequency ultrasound waveform.
  • the primary sweeping waves can include a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts. As can be readily understood, such waves can be generated by appropriate signals to be provided to the piezo crystal 200.
  • the piezo crystal 200 can cover a broad coverage of pre- defined sonic and ultrasound (ultrasonic) frequencies and can generate primary sweeping waves accordingly.
  • the piezo crystal 200 can have a flat band response for all the resonant frequencies.
  • the primary sweeping waves can be tuned and locked-in by the cavity resonator 100 to generate multi-frequency primary standing waves (first set of waves). These waves can then be passed to the secondary wave shaping and scattering section (second section).
  • the cavity resonator 100 can compensate for resonant frequency tolerances of the piezo crystal 200
  • resonant ultrasonic frequency of the piezo crystal 200 can range between 20 kHz and 100 kHz. In an embodiment, resonant sonic frequency of the piezo crystal 200 can range between 1.5 Hz and IOOHzt [0085]
  • the piezo crystal 200 can be so formulated as to obtain a wide range of primary sweeping waves of multiple resonant frequencies. The range can span sonic and ultrasound (ultrasonic) frequencies. Special doping techniques are implemented and various compounds in correct proportions are used in formulation of the proposed piezo crystal 200. In a way, the multi resonant piezo crystal 200 can be construed as a combination of many single frequency crystals into one.
  • FIGs. 3 A through 3B show exemplary Front view and a sectional view of section C-C of the conical reflector of the proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • the multi -frequency primary standing waves (first set of waves) generated by the first section can be passed through a second section comprising conical reflector 300 and multi-direction wave scatter grill (WSG) 400 ( as elaborated in FIG. 4).
  • Conical reflector 300 and WSG 400 can be so arranged in spatial relation with each other that as the primary standing waves pass in space between them, a second set of waves ( secondary standing waves) are generate by the first set of waves.
  • Further interaction and cross talk between the primary standing waves (first set of waves) and the secondary standing waves (second set of waves) can produce a third set of waves (secondary waves).
  • the secondary waves can be sliced at appropriate angles at WSG 400 to generate the waveform.
  • the waveform can propagate conically out from the WSG 400.
  • conical reflector 300 can shape the secondary waves and determine their transmission beam angle. Adjusting focal length of conical reflector 300 can influence/ modulate transmission beam angle of the secondary waves.
  • piezo crystal 200 can be placed at focal area (or at a location in the vicinity of focal area) of conical reflector 300.
  • the conical reflector 300 may include a conical cavity 302 that extends along axial direction of the conical reflector 300 to allow a passage to the first set of waves to pass through the conical reflector 300.
  • the first set of waves are generated by the cavity resonator after tuning and locking-in of the primary sweeping waves.
  • FIGs. 4A through 4C illustrate exemplary perspective view, front view and side view of wave scatter grill of the proposed transducer assembly respectively in accordance with an exemplary embodiment of the present disclosure
  • the wave scatter grill 400 can include a plurality of slots 402 to segregate the secondary waves into a plurality of beams as to obtain a multi-beam waveform as output of the wave scatter grill 400.
  • the plurality of slots 402 further direct the plurality of beams into multiple directions to obtain a multi-directional waveform as output of the wave scatter grill 400/ transducer assembly disclosed.
  • the waveform generated can be capable of targeting harmful microbes that are airborne and/or on surface in enclosed environment in order to control growth of the harmful microbes.
  • number, size (diameter) and shape of each of the plurality of slots 402 can determine/decide the number of the plurality of beams, their intensity and corresponding shapes. Further, the size (as determined by diameter of the WSG 400 in case WSG 400 is circular) can determine wave-scatter coverage of the plurality of beams of the waveform.
  • conical reflector 300 and wave scatter grill 400 can be considered as a secondary wave shaping and scattering section (second section).
  • the second section can modulate conical propagation of the waveform generated and can scatter the conical wave format appropriate grill angles so as to obtain the multi-beam and multi-directional waveform as the output.
  • FIG. 5A illustrates an exemplary exploded view of the proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure
  • FIG. 5B illustrates an exemplary conical waveform generated by proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • the transducer assembly 500 can include a cavity resonator 100 to shape the primary sweeping waves in order to obtain multi -frequency sweeping primary standing waves. Further, ultrasonic transducer assembly 500 can include a secondary wave shaping and scattering section that can attenuate and shape the primary standing waves to finally generate a conical waveform.
  • the wave scatter grill 400 of the secondary wave shaping and scattering section can scatter the conical waveform at appropriate grill angles so as to obtain the multi-beam and multi-directional waveform as the output.
  • the waveform can include a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • FIG. 5B illustrates the conical waveform 550 generated by the transducer assembly 500.
  • proposed system can generate a waveform having a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts, and in a similar manner a plurality of such waveforms.
  • Such waveforms have antibacterial and antifungal properties as have been determined form various tests further elaborated.
  • FIG. 6A shows percentage reduction in various bacteria on steel and plastic surfaces when exposed to waveform generated by proposed transducer assembly
  • FIG.6B shows percentage reduction in various fungi on steel and plastic surfaces when exposed to waveform generated by proposed transducer assembly, in accordance with exemplary embodiments of the present disclosure.
  • proposed transducer assembly can be used to generate a waveform comprising a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • a waveform comprising a burst modulated ultrasound sweep carrier wave with encapsulated sonic artefacts.
  • Such waveforms can be termed as being very low intensity multi -frequency ultrasound (LIMFUS) and as being elaborated are a combination of sonic and ultrasonic waves.
  • LIMFUS very low intensity multi -frequency ultrasound
  • waveform generated by the proposed transducer shows colony formation reduction for various bacteria, such as, but not limited to, Klebsiellapneumoniae, E coli, Salmonella, pseudomonas, Salmonella typhi, Listeria, Methicillin-resistant Staphylococcus aureus (MRSA), Methicillin-Sensitive Staphylococcus aureus (MSSA), Nontuberculous mycobacteria (NTM), Mycobacterium tuberculosis (MTB) Staphylococcus aureus, Mycobacterium Chelonea (NTM).
  • MRSA Methicillin-resistant Staphylococcus aureus
  • MSSA Methicillin-Sensitive Staphylococcus aureus
  • NTM Nontuberculous mycobacteria
  • MTB Mycobacterium tuberculosis
  • Staphylococcus aureus Mycobacterium Chelonea
  • anti-fungal growth for various fungus such as, Mould -Aspergillusniger, Yeast-Candida albicans, and the likes is also achieved, as is anti-viral effect for various viruses, such as, MS2 Phage with E-coli as host.
  • proposed transducer assembly may be useful in preventing diseases caused by airborne and surface microbes especially where a continuous microbe control is required.
  • FIG. 7A illustrates antibacterial efficacy of waveforms generated by proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • the test procedure comprised ascertaining control counts of bacterial organisms from five different locations of a non-sterile room of size 7.75 X 11.5 X 8.5 (H X L X B) feet dimension with one ventilation netted window and controlled accessed.
  • the control counts were done by settle plate method i.e. by exposing sterile Soybean Casein Digest Agar (SCDA) plates at five different locations in the room for 20 minutes, then the SCDA plates were closed and kept for incubation for 48 hours at 37°C.
  • SCDA Soybean Casein Digest Agar
  • FIG. 7B illustrates antifungal efficacy of waveforms generated by proposed transducer assembly in accordance with an exemplary embodiment of the present disclosure.
  • the test procedure comprised ascertaining initially the control counts of fungal organisms from five different locations of a non-sterile room of size 7.75 X 11.5 X 8.5 (H X LX B) feet dimension with one ventilation netted window and controlled accessed.
  • the control counts were done by settle plate method i.e. by exposing sterile Sabouraud’s agar plates at five different locations in the room. Air sampling was done for 20 minutes, then the Sabouraud’s agar plates were closed and kept for incubation for 72 hours at room temperature.
  • FIGs.8A to 8C illustrate results of microbial test over surface of food samples to evaluate reduction of microbial load on such surfaces upon treatment with waveforms generated by proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • TPC Total Plate Count
  • YMC Yeast and Mould Count
  • TA17-003425.001 illustrates a control sample of apples.
  • TA17-003425.002 illustrates the control sample treated with waveforms generated by proposed system for 20 minutes
  • TA17-003425.003 illustrates control sample treated with waveforms generated by proposed system for 20 minutes and further held for 30 minutes.
  • Total Plate Count (TPC) and Total Yeast and Mould Count (TYMC) was determined in terms of Colony Forming Units (CFU) /food surfaces for each case, as illustrated in FIG. 8A. Thereafter log reduction and percentage reduction for each case was determined as illustrated in FIG. 8B and FIG. 8C respectively.
  • FIGs. 9A to 9C illustrate results of surface swab test over different surfaces to evaluate reduction of microbial load on such surfaces upon treatment with waveforms generated by proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • TPC Total Plate Count
  • YMC Yeast and Mould Count
  • Test series 301 indicates surface swab test of plastic surface, wherein column 301.001 indicates data of surface swab solutions of plastic material (control samples), column 301.002 indicates results after test 301.002 viz treatment of the surface swab solutions for 20 minutes with waveforms as described herein, and column 301.003 indicates results after test 301.003 viz treatment of the surface swab solutions for 20 minutes with waveforms as described herein and further 30 minutes hold time. Both TPC and YMC results are indicated.
  • TPC results for plastic surface are indicated at cells 301-01, 301-02, 301-03 and 301-04 respectively, wherein Cell 301-01 and 301-02 indicate, for test 301.002, percentage CFU (colony forming units) reduction and log reduction. Cells 301-03 and 301-04 indicate corresponding TPC results for test 301.003.
  • YMC results for plastic surface are indicated at cells 301-05, 301-06, 301-07 and 301-08 respectively, wherein Cell 301-05 and 301-06 indicate, for test 301.002, percentage CFU (colony forming units) reduction and log reduction. Cells 307-03 and 301-08 indicate corresponding YMC results for test 301.0003.
  • test results are shown for different surfaces such as glass, metal and wooden (as shown in FIG. 9A). Results for surfaces of POP sheet, granite and cloth are shown in FIG. 9B, while that for Tiles, painted wall and fiber are shown in FIG. 9C
  • FIG. 10 illustrates reduction of microbial load in the air upon treatment with waveforms generated by proposed transducer assembly, in accordance with an exemplary embodiment of the present disclosure.
  • TPC Total Plate Count
  • Column 300.001 shows control samples data
  • column 300.001 shows data after treatment for 20 minutes of control samples with waveforms as described herein
  • column 300.003 shows data after treatment for 20 minutes of control samples with waveforms as described herein and further30minutes hold time.
  • the present disclosure provides for a transducer assembly for generating a waveform that creates a vibrational environment to target, limit and control microbes in the environment that are harmful to multi-cellular organisms.
  • the present disclosure provides for a transducer assembly to shape as well as transmit the conical waveform generated thereof.

Abstract

L'invention concerne un ensemble transducteur comprenant un cristal piézoélectrique, un résonateur à cavité, un réflecteur conique et une grille de diffusion d'ondes à directions multiples (WSG). Le cristal piézoélectrique génère des ondes de balayage primaires de multiples fréquences de résonance couvrant des plages de fréquences sonores et ultrasonores (ultrasonores) sur la base de signaux reçus, le résonateur de cavité s'accorde et se verrouille dans les ondes de balayage primaires pour générer des ondes stationnaires primaires, et le réflecteur conique et la WSG sont configurés de telle sorte que la WSG délivre finalement une forme d'onde sur la base des ondes stationnaires primaires. La forme d'onde se propage de manière conique à partir de la WSG et comprend une onde porteuse de balayage ultrasonore modulée en rafale avec des artefacts acoustiques encapsulés et a des propriétés antimicrobiennes.
PCT/IB2018/059348 2018-06-07 2018-11-27 Ensemble transducteur WO2019234485A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3957187A1 (fr) 2020-08-21 2022-02-23 Käsehaus K3 Traitement acoustique de boissons infusées, affinées ou fermentées et systèmes associés
US20220248129A1 (en) * 2021-02-02 2022-08-04 Yamaha Corporation Sound diffuser and diffusion method

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN101044990B (zh) * 1998-09-11 2011-11-23 Gr智力储备股份有限公司 用共振声能和/或共振声电磁能检测和/或影响结构的方法
US9700642B2 (en) * 2005-01-31 2017-07-11 S. Edward Neister Method and apparatus for sterilizing and disinfecting air and surfaces and protecting a zone from external microbial contamination

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN101044990B (zh) * 1998-09-11 2011-11-23 Gr智力储备股份有限公司 用共振声能和/或共振声电磁能检测和/或影响结构的方法
US9700642B2 (en) * 2005-01-31 2017-07-11 S. Edward Neister Method and apparatus for sterilizing and disinfecting air and surfaces and protecting a zone from external microbial contamination

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3957187A1 (fr) 2020-08-21 2022-02-23 Käsehaus K3 Traitement acoustique de boissons infusées, affinées ou fermentées et systèmes associés
US20220248129A1 (en) * 2021-02-02 2022-08-04 Yamaha Corporation Sound diffuser and diffusion method
US11937046B2 (en) * 2021-02-02 2024-03-19 Yamaha Corporation Sound diffuser and diffusion method

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