# US 12,178,671 B2 · Ultrasound treatment appliance with automatic setpoint control

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- Number: US 12,178,671 B2
- Document ID: US12178671B2
- Status: Granted
- Kind: B2
- Application number: 16/481,716
- Filed: 2018-01-29
- Published: 2020-01-23
- Granted: 2024-12-31
- Earliest claimed: 2017-01-30
- Assignees: Societe Pour La Conception Des Applications Des Techniques Electroniques
- Applicants: Societe Pour La Conception Des Applications Des Techniques Electroniques
- Inventors: Xavier Capet; Charles Reche
- Web page: https://patentgrep.com/patent/US12178671B2

## CPC

- A61C 1/07: with vibratory drive, e.g. ultrasonic waves
- A61B 17/320068: {using mechanical vibrations, e.g. ultrasonic (A61B17/22012 takes precedence; dental tooth drilling devices operated by vibration A61C3/03; removing intra-ocular material using mechanical vibrations A61F9/00745)}
- A61C 1/0015: {Electrical systems}
- A61C 17/20: using ultrasonic waves
- A61B 90/03: {Automatic limiting or abutting means, e.g. for safety}
- A61B 2017/0003: {of parts of the instruments}
- A61B 2017/0011: {piezoelectric}
- A61B 2017/00137: {Details of operation mode}
- A61B 2017/00185: {Means for setting or varying the pulse height}
- A61C 1/0007: {Control devices or systems (fluid temperature control in air and water supply systems of dental machines or apparatus A61C1/0069)}
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An ultrasound treatment appliance comprising a surgical handpiece, an ultrasound insert, and an ultrasound generator, the handpiece including a piezoelectric transducer connected to the ultrasound insert and a piezoelectric motor connected to the ultrasound generator. The piezoelectric motor transmits ultrasound waves to the insert, which waves are defined as a function of current and voltage setpoint signals delivered by the ultrasound generator to the piezoelectric motor. The appliance also includes a module for controlling the amplitudes of the setpoint signals and configured to increase or decrease the amplitudes of the current and voltage setpoint signals when the variation in the impedance of the ultrasound signal is greater than a predetermined impedance variation value and when the variation in the frequency of the ultrasound signal is greater than or less than the predetermined frequency variation value.

## Claims

### Claim 1

An ultrasound treatment appliance comprising:
a surgical handpiece,
an ultrasound insert,
an ultrasound generator, and
an electronic control circuit for controlling the ultrasound generator;
wherein the handpiece includes a piezoelectric transducer including a distal portion having the ultrasound insert fastened thereto and a piezoelectric motor connected to the ultrasound generator and mechanically coupled to the distal portion,
wherein the piezoelectric motor is arranged to transmit ultrasound waves to the insert,
wherein said ultrasound waves are transmitted by the piezoelectric motor based on current and voltage setpoint signals delivered by the ultrasound generator to the piezoelectric motor,
wherein the electronic control circuit is configured to:
send the current and voltage setpoint signals to the transducer of the handpiece via cables, the current setpoint signal based on a speed of vibration of the piezoelectric motor and the voltage setpoint signal based on force required for the vibration of the piezoelectric motor;
calculate a variation in frequency and impedance of a control signal in the piezoelectric transducer, the variation in the frequency being calculated between two consecutively measured mean values of the frequency of the control signal and the variation in the impedance being calculated between two consecutively measured mean values of the impedance of the ultrasound signal;
compare the impedance variation of the ultrasound signal with a predetermined impedance variation value;
compare the variation in the frequency of the ultrasound signal with a predetermined frequency variation value;
automatically increase amplitudes of the current and voltage setpoint signals delivered by the ultrasound generator when the calculated variation in the impedance of the ultrasound signal is greater than the predetermined impedance variation value and when the calculated variation in the frequency of the ultrasound signal is greater than the predetermined frequency variation value; and
automatically decrease the amplitudes of the current and voltage setpoint signals delivered by the ultrasound generator when the calculated variation in the impedance of the ultrasound signal is greater than the predetermined impedance variation value and when the calculated variation in the frequency of the ultrasound signal is less than the predetermined frequency variation value.

### Claim 2 (depends on 1)

The appliance according to claim 1, wherein the mean values of the frequency and the impedance of the ultrasound signal in the piezoelectric transducer are measured once every 100 ms.

### Claim 3 (depends on 2)

The appliance according to claim 2, wherein the predetermined frequency variation value is equal to 12 Hz.

### Claim 4 (depends on 2)

The appliance according to claim 2, wherein the predetermined impedance variation value is equal to 26Ω.

### Claim 5 (depends on 1)

The appliance according to claim 1, wherein the amplitudes of the current and voltage setpoint signals delivered by the ultrasound generator are increased by 20% when the calculated variation in the frequency of the ultrasound signal is greater than the predetermined frequency variation value and when the calculated variation in the impedance of the ultrasound signal is greater than the predetermined impedance variation value, and
wherein the amplitudes of the current and voltage setpoint signals delivered by the ultrasound setpoint generator are decreased by 20% when the measured variation in the frequency of the ultrasound signal is less than the predetermined frequency variation value and when the measured variation in the impedance of the ultrasound signal is greater than the predetermined impedance variation value.

### Claim 6 (depends on 1)

The appliance according to claim 1, wherein the piezoelectric motor is interposed between the distal portion and a proximal portion of the piezoelectric transducer, the proximal portion including a reaction mass and the distal portion including an amplifier.

### Claim 7 (depends on 6)

The appliance according to claim 6, wherein the reaction mass and the amplifier bear mechanically against the piezoelectric motor.

### Claim 8 (depends on 7)

The appliance according to claim 7, wherein the piezoelectric motor includes six piezoelectric ceramics of annular shape arranged against one another under stress between the reaction mass and the amplifier.

### Claim 9 (depends on 1)

The appliance according to claim 1, wherein the electronic control circuit further includes:
an ultrasound driver module configured to send the current and voltage setpoint signals to the piezoelectric transducer; and
a magnetic module configured to transform the current and voltage setpoint signals obtained from the ultrasound driver module.

### Claim 10 (depends on 9)

The appliance according to claim 9, wherein the electronic control circuit further includes a module for controlling the amplitudes of the current and voltage setpoint signals, the module configured to:
receive a frequency signal from the ultrasound driver module, the frequency signal corresponding to the ultrasound signal in the piezoelectric transducer;
calculate impedance in the piezoelectric transducer from current and voltage signals obtained from the magnetic module; and
continuously measure the frequency and the impedance of the control signal in the piezoelectric transducer.