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EP4514289A1 - Commande d'un actionneur de phacoémulsifiant - Google Patents

Commande d'un actionneur de phacoémulsifiant

Info

Publication number
EP4514289A1
EP4514289A1 EP23717652.4A EP23717652A EP4514289A1 EP 4514289 A1 EP4514289 A1 EP 4514289A1 EP 23717652 A EP23717652 A EP 23717652A EP 4514289 A1 EP4514289 A1 EP 4514289A1
Authority
EP
European Patent Office
Prior art keywords
actuator
frequency
frequencies
resonant frequency
electrical power
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
EP23717652.4A
Other languages
German (de)
English (en)
Inventor
Amit Fuchs
Philip Alper
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.)
Johnson and Johnson Surgical Vision Inc
Original Assignee
Johnson and Johnson Surgical Vision Inc
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
Priority claimed from US18/118,326 external-priority patent/US20230338190A1/en
Application filed by Johnson and Johnson Surgical Vision Inc filed Critical Johnson and Johnson Surgical Vision Inc
Publication of EP4514289A1 publication Critical patent/EP4514289A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting in contact-lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
    • A61F9/00745—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments using mechanical vibrations, e.g. ultrasonic

Definitions

  • the mechanical resonant frequency may be determined by finding the frequency at which a metric of the electrical power input to the actuator is a maximum .
  • the metric comprises the value of the electrical power delivered to the actuator ( in terms of the voltage , current and phase ) adj usted by a phase factor .
  • step 158 the processor is configured to automatically set its value to be larger than ⁇ f max .
  • decision step 158 returns positive, i.e., yes, processor 38 proceeds to a frequency increment step 162 wherein the processor and module
  • processor 38 continues to a second decision step 166 .
  • step 174 follows from both decision steps
  • Step 162 f(t + n + 1) - f (t + n) + 8f max (6)
  • Step 174
  • the frequency generated by the iterative process, and input to the actuator of the probe is from step 174 and this frequency substantially corresponds to the mechanical resonant frequency, and typically differs from it by at most ⁇ Sf max-
  • the graph illustrates that the times to change resonant frequencies are small: the time from T1 to T2 is of the order of 0.1 s, the time for changing at T3 is of the order of 0.01 s .
  • actuator 22 is energized in one channel. If the actuator 22 is energized in more than one channel, then the processor 38 and module 30 calculate a value for the power metric P m for each of the channels, and in one example the processor sums the power metrics and finds the frequency where the sum is a maximum. This frequency is the mechanical resonant frequency of the probe.
  • K is the same for all channels.
  • oc m for each channel may be determined as described above for the case of a single channel.
  • Fig. 5 is a flowchart showing steps of an alternative algorithm performed by processor 38, using module 30, to determine the mechanical resonant frequency of probe 12, and to drive the probe at this frequency so that it is in resonance.
  • processor 38 uses module 30, to determine the mechanical resonant frequency of probe 12, and to drive the probe at this frequency so that it is in resonance.
  • probe 12 is induced to vibrate mechanically.
  • the frequency of the induced vibration, which is the mechanical resonant frequency is measured, and the processor activates the probe at this frequency, so the probe is in mechanical resonance.
  • probe 12 is coupled to console 28, so that actuator 22 is connected to processor 38 and drive module 30, as is described above with reference to Fig. 1.
  • the processor and the drive module activate actuator 22 electrically, in response to a command from physician 15 .
  • the electrical signal for the activation may comprise a sinusoidal signal , in one example at a frequency selected by the physician, or alternatively at a preset frequency, so that the actuator vibrates mechanically at the selected frequency .
  • the electrical signal may comprise a pulse which compresses and/or extends the piezoelectric elements of the actuator .
  • processor 38 terminates the electrical activation of step 204 of the actuator .
  • the processor begins acquiring and storing signals from the actuator .
  • the actuator is not in a mechanical equilibrium state , so that at the termination the actuator begins to return to an equilibrium state , i . e . , a state where the piezoelectric elements are neither compressed nor extended .
  • the process of returning to the equilibrium state causes the actuator to vibrate at the mechanical resonant frequency of the actuator, and the vibrations cause the actuator piezoelectric elements to generate the signals that the processor acquires .
  • step 212 the processor analyzes the signals stored in step 208 , to ascertain the frequency of the signals , i . e . , the mechanical resonant frequency .
  • the processor activates the actuator at the acquired signal frequency, i . e . , at the mechanical resonant frequency of the actuator .
  • An apparatus comprising: a phacoemulsification probe (12) , comprising a piezoelectric actuator (22) coupled with a needle (16) configured to be inserted into an eye (20) of a patient (19) ; and a processor (38) configured: to sequentially drive the actuator (22) electrically in a range of frequencies, to measure a respective electrical power input to the actuator (22) at each of the frequencies in the range, to identify a frequency in the range of frequencies wherein a metric of the electrical power input is a maximum, and to estimate from the identified frequency a mechanical resonant frequency of the actuator, and to drive the actuator (22) electrically at the mechanical resonant frequency.
  • sequentially driving the actuator (22) in the range of frequencies comprises inputting respective signals to the actuator (22) at each of the frequencies, and wherein the processor (38) is configured to calculate the measured electrical power input of a given signal as a product V ⁇ I ⁇ cos oc wherein V is a voltage, I is a current, and a is a phase between the voltage and the current of the given signal.
  • Example 2 wherein the metric is a product V ⁇ I ⁇ cos (oc + oc m ) wherein am is a phase adjustment factor that corrects the measured electrical power input so that the metric is a maximum when the actuator is operating at the mechanical resonant frequency .
  • identifying the frequency comprises measuring a gradient comprising a change of the metric divided by a change of the frequency, and determining the frequency at which the gradient is zero .
  • measuring the gradient comprises iteratively measuring the gradient while sequentially driving the actuator at each of the frequencies in the range of frequencies .
  • Example 1 The apparatus of any of Example 1 to Example 5 , wherein the actuator ( 22 ) is configured to be energized in a single channel .
  • Example 1 The apparatus of any of Example 1 to Example 6 , wherein the actuator ( 22 ) is configured to be energized in a plurality of channels , and wherein the processor is configured to identify the frequency wherein a sum of the metrics of the electrical power input for each channel is a maximum.
  • a method comprising : coupling a piezoelectric actuator ( 22 ) , comprised in a phacoemulsification probe ( 12 ) , with a needle (16) configured to be inserted into an eye (20) of a patient (19) ; sequentially driving the actuator (22) electrically in a range of frequencies; measuring a respective electrical power input to the actuator (22) at each of the frequencies in the range; identifying a frequency in the range of frequencies wherein a metric of the electrical power input is a maximum; estimating from the identified frequency a mechanical resonant frequency of the actuator (22) ; and driving the actuator (22) electrically at the mechanical resonant frequency.
  • Example 8 wherein sequentially driving the actuator (22) in the range of frequencies comprises inputting respective signals to the actuator at each of the frequencies, and measuring the respective electrical power comprises calculating the measured electrical power input of a given signal as a product V ⁇ I ⁇ cos oc wherein V is a voltage, I is a current, and a is a phase between the voltage and the current of the given signal.
  • Example 9 The method of Example 9, wherein the metric is a product V ⁇ I ⁇ cos (oc + oc m ) wherein am is a phase adjustment factor that corrects the measured electrical power input so that the metric is a maximum when the actuator (22) is operating at the mechanical resonant frequency.
  • EXAMPLE 11 The method of any of Example 8 to Example 10, wherein identifying the frequency comprises measuring a gradient comprising a change of the metric divided by a change of the frequency, and determining the frequency at which the gradient is zero .
  • measuring the gradient comprises iteratively measuring the gradient while sequentially driving the actuator (22) at each of the frequencies in the range of frequencies.
  • Example 8 The method of any of Example 8 to Example 12, wherein the actuator (22) is configured to be energized in a single channel.
  • Example 8 The method of any of Example 8 to Example 13, wherein the actuator (22) is configured to be energized in a plurality of channels, and wherein identifying the frequency comprises identifying the frequency wherein a sum of the metrics of the electrical power input for each channel is a maximum.
  • An apparatus comprising: a phacoemulsification probe (12) , comprising a piezoelectric actuator (22) coupled with a needle (16) configured to be inserted into an eye (20) of a patient (19) ; and a processor (38) configured: to activate the actuator (22) electrically, and subsequently halt activation of the actuator (22) , to acquire electrical signals generated by the actuator (22) after halting the activation; to analyze the acquired signals so as identify therefrom a mechanical resonant frequency of the actuator (22) , and to drive the actuator (22) electrically at the identified mechanical resonant frequency.
  • Example 15 The apparatus of Example 15, wherein the activation comprises activation with an oscillating signal.
  • Example 15 The apparatus of Example 15 or Example 16, wherein the activation comprises activation with an electric pulse.
  • a method comprising: coupling a piezoelectric actuator (22) , comprised in a phacoemulsification probe (12) , with a needle (16) configured to be inserted into an eye (20) of a patient (19) ; activating the actuator (22) electrically, and subsequently halting activation of the actuator (22) , acquiring electrical signals generated by the actuator (22) after halting the activation; analyzing the acquired signals so as identify therefrom a mechanical resonant frequency of the actuator (22) , and driving the actuator (22) electrically at the identified mechanical resonant frequency.
  • activating the actuator (22) comprises activating with an oscillating signal.
  • EXAMPLE 20 The method of Example 18 or Example 19 , wherein activating the actuator ( 22 ) comprises activating with an electric pulse .

Landscapes

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

Les procédés et les appareils de l'invention concernent une sonde de phacoémulsification, la sonde présentant un actionneur piézoélectrique accouplé à une aiguille conçue pour être insérée dans un œil d'un patient ; et un processeur configuré pour entraîner séquentiellement l'actionneur électriquement dans une plage de fréquences, pour mesurer une entrée d'énergie électrique respective à l'actionneur à chacune des fréquences dans la plage, pour identifier une fréquence dans la plage de fréquences, une métrique de l'entrée d'énergie électrique étant un maximum, et pour estimer à partir de la fréquence identifiée une fréquence de résonance mécanique de l'actionneur et pour entraîner l'actionneur électriquement à la fréquence de résonance mécanique.
EP23717652.4A 2022-04-26 2023-03-24 Commande d'un actionneur de phacoémulsifiant Pending EP4514289A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US202263334840P 2022-04-26 2022-04-26
US18/118,326 US20230338190A1 (en) 2022-04-26 2023-03-07 Driving a phacoemulsifier actuator
PCT/IB2023/052962 WO2023209462A1 (fr) 2022-04-26 2023-03-24 Commande d'un actionneur de phacoémulsifiant

Publications (1)

Publication Number Publication Date
EP4514289A1 true EP4514289A1 (fr) 2025-03-05

Family

ID=86052216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23717652.4A Pending EP4514289A1 (fr) 2022-04-26 2023-03-24 Commande d'un actionneur de phacoémulsifiant

Country Status (3)

Country Link
EP (1) EP4514289A1 (fr)
CN (1) CN119095562A (fr)
WO (1) WO2023209462A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0270819A3 (fr) * 1986-11-07 1989-01-11 Alcon Laboratories, Inc. Commande linéaire de puissance d'un transducteur à ultrasons au moyen d'une réactance accordée
DE69019289T2 (de) * 1989-10-27 1996-02-01 Storz Instr Co Verfahren zum Antreiben eines Ultraschallwandlers.
US5417246A (en) * 1989-10-27 1995-05-23 American Cyanamid Company Pneumatic controls for ophthalmic surgical system
AU724661B2 (en) * 1996-08-29 2000-09-28 Bausch & Lomb Surgical, Inc. Dual loop frequency and power control

Also Published As

Publication number Publication date
CN119095562A (zh) 2024-12-06
WO2023209462A1 (fr) 2023-11-02

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