# US 8,569,925 B2 · Low energy or minimum disturbance method for measuring frequency response functions of ultrasonic surgical devices in determining optimum operating point

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- Number: US 8,569,925 B2
- Document ID: US8569925B2
- Status: Granted
- Kind: B2
- Application number: 13/784,257
- Filed: 2013-03-04
- Published: 2013-07-11
- Granted: 2013-10-29
- Earliest claimed: 2009-09-16
- Assignees: Covidien LP
- Applicants: Covidien LP
- Inventors: James A. Gilbert
- Web page: https://patentgrep.com/patent/US8569925B2

## CPC

- A61N 7/02: Localised ultrasound hyperthermia
- B06B 1/0253: {taken directly from the generator circuit}
- H04B 11/00: Transmission systems employing ultrasonic, sonic or infrasonic waves
- A61B 17/22012: {in direct contact with, or very close to, the obstruction or concrement (for removing obstructions in blood vessels by laser A61B18/245)}
- A61B 2017/00106: {ultrasonic}
- A61B 2017/00146: {with multiple frequencies}
- A61B 2017/00199: {with a console, e.g. a control panel with a display}
- A61B 2017/00734: {battery operated}
- A61B 2017/320069: {for ablating tissue}
- A61B 2017/32007: {with suction or vacuum means}
- A61B 2017/320074: {blade}
- A61B 2017/320078: {Tissue manipulating surface}
- A61B 2017/320095: {with sealing or cauterizing means}
- B06B 2201/76: Medical, dental
- A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B)
- B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R)
- H04B: TRANSMISSION
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A method for measuring frequency response is provided that includes supplying ultrasonic energy to an ultrasonic device configured to impart energy to tissue, providing a drive signal and a noise signal, combining the drive signal and the noise signal to create a combined signal, amplifying the combined signal and providing the amplified signal to the ultrasonic device, receiving an output signal from the ultrasonic device and the noise signal, calculating a transfer function estimate based on the output signal and the noise signal, adjusting the drive signal generator based on the calculated transfer function estimate, and determining a phase difference by time aligning the noise signal in the output signal with the noise signal provided.

## Claims

### Claim 1

A method for measuring frequency response, comprising:
supplying ultrasonic energy to an ultrasonic device configured to impart energy to tissue;
providing a drive signal;
providing a noise signal, wherein the noise signal is a pseudo random noise sequence;
combining the drive signal and the noise signal to create a combined signal; and
amplifying the combined signal and providing the amplified signal to the ultrasonic device.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising:
receiving an output signal from the ultrasonic device and the noise signal;
calculating a transfer function estimate based on the output signal and the noise signal; and
adjusting the drive signal generator based on the calculated transfer function estimate.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising determining a phase difference by time aligning the noise signal in the output signal with the noise signal provided.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the noise signal is pink noise.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the noise signal is a narrowband white noise.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the combined signal is amplified by an amplifier having a gain.

### Claim 7 (depends on 6)

The method according to claim 6, wherein the gain is preset by a manufacturer.

### Claim 8 (depends on 6)

The method according to claim 6, wherein the gain is user selectable.

### Claim 9 (depends on 2)

The method according to claim 2, wherein the transfer function estimate is calculated by a Fast Fourier Transform of the output signal and the noise signal.

### Claim 10

A method for supplying power to an ultrasonic device, comprising:
providing a drive signal;
amplifying the drive signal;
providing a noise signal;
providing an output of a resonance circuit to the ultrasonic device;
receiving an output signal of the ultrasonic device and the noise signal;
calculating a transfer function estimate based on the output signal of the ultrasonic device and the noise signal;
adjusting the drive signal based on the calculated transfer function estimate.

### Claim 11 (depends on 10)

The method according to claim 10, wherein the resonance circuit is an LC circuit.

### Claim 12 (depends on 10)

The method according to claim 10, wherein the drive signal is amplified by a Class D amplifier.