CA2359400A1 - Method for detecting transverse vibrations in an ultrasonic hand piece - Google Patents

Method for detecting transverse vibrations in an ultrasonic hand piece Download PDF

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Publication number
CA2359400A1
CA2359400A1 CA002359400A CA2359400A CA2359400A1 CA 2359400 A1 CA2359400 A1 CA 2359400A1 CA 002359400 A CA002359400 A CA 002359400A CA 2359400 A CA2359400 A CA 2359400A CA 2359400 A1 CA2359400 A1 CA 2359400A1
Authority
CA
Canada
Prior art keywords
hand piece
blade
impedance
power
frequency
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.)
Granted
Application number
CA002359400A
Other languages
French (fr)
Other versions
CA2359400C (en
Inventor
Eitan Wiener
William T. Donofrio
Allan L. Friedman
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.)
Ethicon Endo Surgery Inc
Original Assignee
Ethicon Endo-Surgery, Inc.
Eitan Wiener
William T. Donofrio
Allan L. Friedman
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 Ethicon Endo-Surgery, Inc., Eitan Wiener, William T. Donofrio, Allan L. Friedman filed Critical Ethicon Endo-Surgery, Inc.
Publication of CA2359400A1 publication Critical patent/CA2359400A1/en
Application granted granted Critical
Publication of CA2359400C publication Critical patent/CA2359400C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • A61B2017/00017—Electrical control of surgical instruments
    • A61B2017/00115—Electrical control of surgical instruments with audible or visual output
    • A61B2017/00119—Electrical control of surgical instruments with audible or visual output alarm; indicating an abnormal situation
    • 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
    • A61B2017/00137—Details of operation mode
    • 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
    • A61B2017/320069—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic for ablating tissue
    • 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
    • A61B2017/320071—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with articulating means for working tip
    • 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
    • A61B2017/320089—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic node location

Abstract

A method for detecting transverse mode vibrations in an ultrasonic hand piece/blade is achieved by monitoring the power delivered to the hand piece/blade to determine whether it increases as expected when power levels applied to the hand piece/blade are changed. While the blade is being held in midair, the power delivered to the hand piece/blade and /or the impedance of the hand piece/blade is measured at a first power level. Using the value obtained at the first power level, the expected power at a second power level is calculated and used to set a pass/fail threshold level for an actual measured power. Alternatively, the threshold is set for the impedance is set. Next, the actual power delivered to the hand piece/blade and/or the impedance of the hand piece/blade is measured at a level 5 power setting. A determination is made whether the hand piece/blade exhibits transverse mode behavior based on whether the actual measured power exceeds the established pass/fail threshold level. If this is the case, operation of the generator is inhibited, a "Transverse Mode Vibrations Present in Hand Piece/Blade" error code is stored in the generator, and a "Bad Hand Piece" message is displayed on a liquid crystal display on the generator. In addition, a method for detecting transverse mode vibration in an ultrasonic hand piece/blade is achieved by monitoring power delivered to the hand piece/blade to determine if the an extraordinary power increase occurs as the drive frequency is shifted downward and/or upward from a primary intended resonance operating frequency.

Claims (37)

1. A method for detecting transverse vibrations in an ultrasonic hand piece, comprising the steps of:
applying a drive signal to an ultrasonic hand piece using an ultrasonic generator;
measuring power delivered to the hand piece/blade at a first power level while the hand piece/blade is held in midair;
calculating an expected power using the first power level;
setting a pass/fail threshold level for an actual measured power based on the expected power;
measuring the actual power delivered to the hand piece/blade;
comparing the measured actual power to the pass/fail threshold;
if the measured actual power is less than the pass/fail threshold, displaying a first message on a liquid crystal display of the generator; and if the measured actual power is greater than the pass/fail threshold, displaying a second message on a liquid crystal display of the generator.
2. The method of claim 1, wherein the first message is a "Hand Piece/Blade Passed"
message.
3. The method of claim 1, wherein the first power level is approximately 100 ma RMS.
4. The method of claim 3, wherein said calculating step comprises the step of:
calculating the expected power for a level five setting.
5. The method of claim 1, wherein said step of displaying a second message comprises the step of:
storing a "Transverse Mode Vibrations Present in Hand Piece/Blade" error code in the generator; and displaying a "Bad Hand Piece" message on the liquid crystal display of the generator.
6. The method of claim 1, wherein the drive signal has a frequency of approximately 20 Khz to 70 KHz.
7. The method of claim 1, wherein the pass/fail threshold is approximately 10 percent of the expected power.
8. The method of claim 3, wherein the level 5 setting is approximately 425 ma RMS.
9. A method for detecting transverse vibrations in an ultrasonic hand piece, comprising the steps of:
applying a drive signal at a primary resonance frequency to an ultrasonic hand piece using an ultrasonic generator;
measuring impedance of the hand piece at the primary resonance frequency;
shifting the primary resonance frequency of the drive signal;
measuring the impedance of the hand piece at the shifted resonance frequency;
comparing the measured impedance at the primary resonance frequency to the impedance of the hand piece at the shifted resonance frequency; and if the measured impedance is greater than a predetermined threshold, displaying a message on a liquid crystal display of the generator.
10. The method of claim 9, wherein the said shifting step comprises the step of:
shifting the drive frequency downward by a first frequency.
11. The method of claim 10, wherein the first frequency is approximately 200 Hz.
12. The method of claim 9, wherein the primary resonance is approximately 55 kHz.
13. The method of claim 9, wherein said comparing step comprises the step of:
determining whether the impedance of the hand piece at the primary resonance is no more than twenty percent lower than the impedance of the hand piece at the shifted resonance frequency; and initiating an alarm to indicate a transverse malfunction exists, if the impedance of the hand piece at the primary resonance is more than twenty percent lower than the impedance of the hand piece at the shifted resonance frequency.
14. The method of claim 9, further comprising the step of:
shifting the drive frequency upward.
15. The method of claim 14, wherein said shifting step comprises the step of:
shifting the drive frequency a predetermined frequency above the primary resonance; and measuring the impedance of the hand piece at the predetermined frequency.
16. The method of claim 14, wherein the predetermined frequency is approximately 200 Hz.
17. The method of claim 15, further comprising the step of:
comparing the measured impedance at the primary frequency to the measured impedance at the predetermined frequency above the primary frequency.
18. The method of claim 17, wherein said comparing step comprises the step of:
determining whether the impedance of the hand piece at the primary resonance is no more than twenty percent lower than the impedance of the hand piece at the predetermined frequency above the primary frequency.
19. The method of claim 18, wherein the predetermined frequency is approximately 200 Hz.
20. The method of claim 18, further comprising the step of:
initiating a pause, if the impedance the hand piece at the primary resonance is no more than twenty percent lower than the impedance of the hand piece at the predetermined frequency above the primary frequency; and returning to the step of applying the drive signal at the primary resonance frequency to the ultrasonic hand piece using the ultrasonic generator.
21. The method of claim 20, wherein the pause is at least 10 seconds.
22. The method of claim 18, further comprising the step of:
returning to said step of initiating an alarm, if the impedance of the hand piece at the primary resonance is more than twenty percent lower than the impedance of the hand piece at the predetermined frequency above the primary frequency.
23. The method of claim 9, wherein the drive signal has a constant current level.
24. A method for detecting transverse vibrations in an ultrasonic hand piece, comprising the steps of:
sweeping a drive signal having a voltage and current applied to an ultrasonic hand piece/blade using an ultrasonic generator;

monitoring and storing voltages and currents applied to the hand piece/blade in non-volatile memory located in the ultrasonic generator;
calculating power delivered to the hand piece based on the stored voltages and stored currents;
generating response curves based on the stored voltages and stored currents;
performing an extrapolation using the response curve to determine whether the hand piece/blade exhibits transverse modes;
if the hand piece/blade exhibits transverse modes, displaying a message on a liquid crystal display of the generator.
25. The method of claim 24, wherein the message is a "Hand Piece/Blade Contains Transverse Mode Vibrations" message.
26. The method of claims 24, wherein said applying step comprises the step of:
applying the drive signal from a minimum drive current level to a maximum drive current level.
27. The method of claim 26, wherein the minimum drive current level is approximately 100 ma RMS and the maximum drive current level is approximately 425 ma RMS.
28. The method of claim 24, wherein the response curves are at least one of a Power-Delivered vs. Drive Current Level curve and a Hand Piece/Blade impedance vs. Drive Current level curve.
29. The method of claim 24, wherein the extrapolation comprises the step of:
checking the generated response curves to determine whether any curve represents at least one of a straight line and a relationship which is quadratic.
30. A method for detecting transverse vibrations in an ultrasonic hand piece, comprising the steps of:
applying a drive signal to an ultrasonic hand piece using an ultrasonic generator;
measuring impedance of the hand piece/blade at a first power level while the hand piece/blade is held in midair;
calculating an expected impedance at a second power level using the first power level;
setting a pass/fail threshold for an increase in impedance of the hand piece/blade based on the calculated expected impedance;
measuring the impedance of the hand piece/blade at the second power level;
comparing the measured impedance at the second power level to the pass/fail threshold;
if the measured impedance of the hand piece/blade is less than the pass/fail threshold, displaying a first message on a liquid crystal display of the generator;
and if the measured impedance of the hand piece/blade is greater than the pass/fail threshold, displaying a second message on a liquid crystal display of the generator.
31. The method of claim 30, wherein the first message is a "Hand Piece/Blade Passed"
message.
32. The method of claim 30, wherein the first power level is approximately 100 ma RMS.
33. The method of claim 32, wherein said calculating step comprises the step of:
calculating the expected impedance for a level five power setting.
34. The method of claim 30, wherein said step of displaying a second message comprises the step of:
storing a "Transverse Mode Vibrations Present in Hand Piece/Blade" error code in the generator; and displaying a "Bad Hand Piece" message on the liquid crystal display of the generator.
35. The method of claim 30, wherein the drive signal has a frequency of approximately 20 Khz to 70 KHz.
36. The method of claim 30, wherein the pass/fail threshold is approximately 10 percent of the expected impedance.
37. The method of claim 32, wherein the level 5 setting is approximately 425 ma RMS.
CA2359400A 2000-10-20 2001-10-17 Method for detecting transverse vibrations in an ultrasonic hand piece Expired - Lifetime CA2359400C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US24225100P 2000-10-20 2000-10-20
US60/242,251 2000-10-20
US09/953,006 2001-09-14
US09/953,006 US6679899B2 (en) 2000-10-20 2001-09-14 Method for detecting transverse vibrations in an ultrasonic hand piece

Publications (2)

Publication Number Publication Date
CA2359400A1 true CA2359400A1 (en) 2002-04-20
CA2359400C CA2359400C (en) 2010-10-12

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CA2359400A Expired - Lifetime CA2359400C (en) 2000-10-20 2001-10-17 Method for detecting transverse vibrations in an ultrasonic hand piece

Country Status (5)

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US (2) US6679899B2 (en)
EP (1) EP1201195B1 (en)
AU (1) AU780276B2 (en)
CA (1) CA2359400C (en)
DE (1) DE60109555T8 (en)

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CN114136429A (en) * 2021-11-18 2022-03-04 孚泽(成都)科技有限公司 Ultrasonic knife amplitude testing method and device based on improved light spot method
CN116687518A (en) * 2022-10-28 2023-09-05 江西远赛医疗科技有限公司 Resonant frequency tracking method and device, electronic equipment and storage medium

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US7244262B2 (en) 2007-07-17
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