CA2359141A1 - Method for detecting blade breakage using rate and/or impedance information - Google Patents
Method for detecting blade breakage using rate and/or impedance information Download PDFInfo
- Publication number
- CA2359141A1 CA2359141A1 CA 2359141 CA2359141A CA2359141A1 CA 2359141 A1 CA2359141 A1 CA 2359141A1 CA 2359141 CA2359141 CA 2359141 CA 2359141 A CA2359141 A CA 2359141A CA 2359141 A1 CA2359141 A1 CA 2359141A1
- Authority
- CA
- Canada
- Prior art keywords
- change
- rate
- blade
- generator
- rates
- 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
Links
- 238000000034 method Methods 0.000 title claims 10
- 238000012544 monitoring process Methods 0.000 claims abstract 5
- 239000004973 liquid crystal related substance Substances 0.000 claims 3
- 230000001112 coagulating effect Effects 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract 1
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- Surgical Instruments (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Failures associate with bad hand pieces and blade failures in an ultrasonic surgical system are distinguished by monitoring the rate of change of the resonance frequency and the rate of change of the resonance impedance of the hand piece/blade as the drive frequency is changed.
As the system reaches resonance, the control system locks onto the resonance frequency. When a loss of lock occurs with no recovery, the rate of change of the frequency and rate of change of the impedance are compared to obtain the fastest rate of change which is stored in non-volatile memory of the ultrasonic generator. If the rates of change are higher than normal rates of change due to temperature changes with the longest blades, a "Bad Blade" message is displayed on an LCD.
As the system reaches resonance, the control system locks onto the resonance frequency. When a loss of lock occurs with no recovery, the rate of change of the frequency and rate of change of the impedance are compared to obtain the fastest rate of change which is stored in non-volatile memory of the ultrasonic generator. If the rates of change are higher than normal rates of change due to temperature changes with the longest blades, a "Bad Blade" message is displayed on an LCD.
Claims (9)
1. A method for distinguishing between bad hand pieces and blade failures in an ultrasonic surgical system, comprising the steps of:
applying a drive signal to an ultrasonic hand piece/blade at a predetermined drive frequency;
monitoring and storing a rate of change of a resonance frequency and a rate of change of a resonance impedance of the hand piece/blade as the drive frequency is changed in memory of the generator;
performing a diagnostic self test in an ultrasonic generator located in the ultrasonic surgical system;
monitoring the ultrasonic generator in the ultrasonic surgical system to determine whether lock is present;
if lock is not present, retrieving the rate of change of the resonance frequency and the rate of change of the resonance impedance from memory of the generator;
comparing the rate of change of the resonance frequency and the rate of change of the resonance impedance to obtain a fastest rate of change which is stored in the memory of the generator; and if the rates of change are higher than normal rates of change due to temperature changes associated with longer blades, displaying a message on a liquid crystal display of the generator.
applying a drive signal to an ultrasonic hand piece/blade at a predetermined drive frequency;
monitoring and storing a rate of change of a resonance frequency and a rate of change of a resonance impedance of the hand piece/blade as the drive frequency is changed in memory of the generator;
performing a diagnostic self test in an ultrasonic generator located in the ultrasonic surgical system;
monitoring the ultrasonic generator in the ultrasonic surgical system to determine whether lock is present;
if lock is not present, retrieving the rate of change of the resonance frequency and the rate of change of the resonance impedance from memory of the generator;
comparing the rate of change of the resonance frequency and the rate of change of the resonance impedance to obtain a fastest rate of change which is stored in the memory of the generator; and if the rates of change are higher than normal rates of change due to temperature changes associated with longer blades, displaying a message on a liquid crystal display of the generator.
2. The method of claims 1, wherein the step of applying the drive signal comprises exciting the hand piece/blade with an ultrasonic signal at the predetermined drive frequency.
3. The method of claim 2, wherein the predetermined drive frequency is in a range of 50 kHz to 56 kHz.
4. The method of claim 1, wherein the step of monitoring the rate of change of the resonance frequency and the rate of change of the resonance impedance is performed continuously at start up.
5. The method of claim 1, wherein, if the diagnostic self test fails, all tests are terminated.
6. The method of claim 1, wherein the step of monitoring the ultrasonic generator is performed during use of the hand piece/blade.
7. The method of claim 6, wherein use of the hand piece/blade comprises at least one of running the hand piece/blade in mid-air, cutting tissue, cauterizing tissue and coagulating tissue.
8. The method of claim 1, wherein the step of displaying the message comprises the steps of:
displaying a "Bad Blade" message on the liquid crystal display, if the rates of change are higher than the normal rates of change due to the temperature changes associated with the longer blades; and displaying a "Bad Hand Piece" message on the liquid crystal display, if the fastest rates of change are lower than the normally expected rates of change due to the temperature changes associated with the blades having the longest physical length and the generator passed the diagnostic self test.
displaying a "Bad Blade" message on the liquid crystal display, if the rates of change are higher than the normal rates of change due to the temperature changes associated with the longer blades; and displaying a "Bad Hand Piece" message on the liquid crystal display, if the fastest rates of change are lower than the normally expected rates of change due to the temperature changes associated with the blades having the longest physical length and the generator passed the diagnostic self test.
9. The method of claim 8, wherein the normally expected rates of change are constant values which are stored in the memory of the generator.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24227300P | 2000-10-20 | 2000-10-20 | |
| US60/242,273 | 2000-10-20 | ||
| US68408901A | 2001-08-10 | 2001-08-10 | |
| US09/684,089 | 2001-08-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2359141A1 true CA2359141A1 (en) | 2002-04-20 |
| CA2359141C CA2359141C (en) | 2010-07-06 |
Family
ID=26934961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2359141 Expired - Lifetime CA2359141C (en) | 2000-10-20 | 2001-10-17 | Method for detecting blade breakage using rate and/or impedance information |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4059336B2 (en) |
| AU (1) | AU783220B2 (en) |
| CA (1) | CA2359141C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090259149A1 (en) * | 2008-04-15 | 2009-10-15 | Naoko Tahara | Power supply apparatus for operation |
| US8095327B2 (en) * | 2008-04-15 | 2012-01-10 | Olympus Medical Systems Corp. | Power supply apparatus for operation |
| US20090259221A1 (en) * | 2008-04-15 | 2009-10-15 | Naoko Tahara | Power supply apparatus for operation |
| US9237921B2 (en) * | 2012-04-09 | 2016-01-19 | Ethicon Endo-Surgery, Inc. | Devices and techniques for cutting and coagulating tissue |
| WO2015088016A1 (en) | 2013-12-13 | 2015-06-18 | オリンパス株式会社 | Inspection probe, vibration state inspection system, and vibration state inspection method |
| WO2018103323A1 (en) * | 2016-12-06 | 2018-06-14 | 大连理工大学 | Ultrasonic cutter detection method and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6036667A (en) * | 1996-10-04 | 2000-03-14 | United States Surgical Corporation | Ultrasonic dissection and coagulation system |
| US6629831B2 (en) * | 1999-04-16 | 2003-10-07 | Coach Wei | Apparatus for altering the physical properties of fluids |
| US6480796B2 (en) * | 2000-10-20 | 2002-11-12 | Ethicon Endo-Surgery, Inc. | Method for improving the start up of an ultrasonic system under zero load conditions |
-
2001
- 2001-10-17 CA CA 2359141 patent/CA2359141C/en not_active Expired - Lifetime
- 2001-10-19 AU AU81515/01A patent/AU783220B2/en not_active Ceased
- 2001-10-22 JP JP2001360096A patent/JP4059336B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU783220B2 (en) | 2005-10-06 |
| AU8151501A (en) | 2002-08-01 |
| JP4059336B2 (en) | 2008-03-12 |
| CA2359141C (en) | 2010-07-06 |
| JP2003159259A (en) | 2003-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20211018 |