WO1998005437B1 - Ultrasonic generator circuit incorporating a power oscillator and a feedback loop - Google Patents
Ultrasonic generator circuit incorporating a power oscillator and a feedback loopInfo
- Publication number
- WO1998005437B1 WO1998005437B1 PCT/GB1997/002052 GB9702052W WO9805437B1 WO 1998005437 B1 WO1998005437 B1 WO 1998005437B1 GB 9702052 W GB9702052 W GB 9702052W WO 9805437 B1 WO9805437 B1 WO 9805437B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ultrasonic generator
- feedback
- generator circuit
- circuit
- voltage
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims 9
- 238000004804 winding Methods 0.000 claims 5
- 238000007599 discharging Methods 0.000 claims 3
- 230000001939 inductive effect Effects 0.000 claims 3
- 230000001012 protector Effects 0.000 claims 3
- 239000007858 starting material Substances 0.000 claims 3
- 238000001514 detection method Methods 0.000 claims 2
- 238000005070 sampling Methods 0.000 claims 1
Abstract
An ultrasonic generator circuit is described which comprises a resonant LC power oscillator circuit for driving an ultrasonic transducer, the resonant circuit comprising a voltage controlled switching element (an integrated gate bipolar transistor is preferred), and feedback being provided via a feedback transformer whose primary is connected in the resonant circuit, the secondary of the feedback transformer being connected to a feedback signal converter which, in dependence upon feedback current induced in the secondary of the feedback transformer, applied a feedback voltage to the input of the voltage controlled switching element (Fig. 6).
Claims
1. An ultrasonic generator circuit comprising a DC supply, an ultrasonic transducer, and a power oscillator connected to the ultrasonic transducer for driving thereof, the power oscillator comprising a capacitance and an inductance arranged in a resonant circuit, and a voltage controlled switching element, the inductance and the voltage controlled switching element being connected in series across the DC supply, and tne primary of a feedback transformer being connected in the resonant circuit, the secondary of the feedback transformer, being connected to the input of a feedback signal converter such that, in dependence upon a feedback current induced in the secondary of the feedback transformer, the feedback signal converter controls a feedback voltage applied to the input of the voltage controlled switching element, the generator circuit being provided with a starter circuit for applying an alternating current to the voltage controlled switching element to initiate oscillator action .
2 An ultrasonic generator circuit as claimed m claim 1, wherein the feedback signal converter comprises a switching transistor/diode combination.
3. An ultrasonic generator circuit as claimed m claim 2, wherein the diode is connected to the switching transistor m base-emitter configuration
AMENDED SHEET (ARηCLE 19) 43
4 An ultrasonic generator circuit as claimed m claim 2 or claim 3, wherein the collector- emitter path of the transistor is connected across a DC potential, the feedback voltage signal being taken from a connection to the collector of the switching transistor, while the base of the switching transistor is connected to the secondary winding of the feedback transformer .
5. An ultrasonic generator circuit as claimed in any of claims 2 to 4 , wherein the output of the switching transistor is led to the respective oases of two follower transistor connected n series across the DC supply m emitter follower configuration, their output being connected to the input of the voltage controlled switching device.
6 An ultrasonic generator circuit as claimed in claim 5, wherein the output of the switching transistor is connected to the input of a second switching transistor whose output is connected to the respective bases of the follower transistors.
7. An ultrasonic generator circuit as claimed m any preceding claim, wherein the starter circuit comprises a low power sine wave oscillator.
8. An ultrasonic generator circuit as claimed in claim 7, wherein the low power oscillator of the starter circuit is connected to a DC power supply via a timing capacitor, such that after switching on of the generator system the voltage supplied to the low 44 power oscillator, and consequently the output of the low power oscillator, are reduced at a pre-set rate.
9. An ultrasonic generator circuit as claimed in claim 7 or claim 8, wherein the output of the low power oscillator is connected to a sine/square converter whose output is connected via a differentiating capacitor to the base of the switching transistor, a resistor being connected to a point between the differentiating capacitor and the base of the switching transistor.
10. An ultrasonic generator circuit as claimed in any preceding claim, wherein connection of the secondary of the feedback transformer to the input of the feedback signal converter is via a series combination of a feedback capacitor and the primary winding of a frequency sweep transformer.
11. An ultrasonic generator circuit as claimed in claim 10, wherein the secondary of the frequency sweep transformer is connected across a frequency sweep inductor.
12. An ultrasonic generator circuit as claimed in any preceding claim, wherein the DC supply is formed as a rectified AC supply which is only partially smoothed.
13. An ultrasonic generator circuit as claimed in claim 11 or claim 12, wherein protector means are provided for protecting the generator circuit from an excess supply voltage, the protector means comprising a normally open, electronically controlled switch connected between ground/the low side of the DC power supply and a point in the feedback circuit between the primary winding of the frequency sweep transformer and the feedback capacitor, and detector means for determining when the supply voltage exceeds a predetermined level and closing the electronically controlled switch in response thereto.
14 An ultrasonic generator circuit as claimed m claim 13, wherein the detector means comprise a voltage comparator, means for providing a reference voltage to one input of the voltage comparator, and a potential divider connected across the DC supply for providing a proportion of the DC supply voltage to another input of the voltage comparator .
15 An ultrasonic generator as claimed in claim 13 or claim 14, wherein the electronically controlled switch is a thyristor whose input is connected to the output of the voltage comparator.
16. An ultrasonic generator circuit as claimed n any of claims 13 to 15, wherein the output of the detector means is also connected to discharging means for discharging, upon detection of an excess supply voltage by the detector means, the timing capacitor connected to the low level oscillator
17. An ultrasonic generator circuit as claimed m claim 16, wherein the discharging means 46 comprise a discharge transistor whose base is connected to the output of the detector means, the controller/emitter path of the discharge transistor being connected between the timer capacitor and ground/the low side of the DC power supply, via a discharge resistor.
18. An ultrasonic generator circuit as claimed in any preceding claim, wherein current protector means are provided to detect an excess current in the power oscillator circuit and in response thereto to divert the feedback signal to ground/ the low side of the DC power supply to stop the power oscillator circuit.
19. An ultrasonic generator circuit as claimed in claim 18, which comprises a normally open electronically controlled switch connected between the input of the voltage controlled switching element and ground/the low side of the DC power supply, and inductive means for sampling the current in the power oscillator circuit, the inductive means being connected to control means adapted to close the electronically controlled switch upon occurrence of an excess current .
20. An ultrasonic generator circuit as claimed in claim 18 or claim 19, wherein the inductive means is connected to an input of a voltage comparator whose other input is connected to means for supplying a reference voltage, the output of the voltage comparator being connected to the base of a switching transistor 47 whose collector/emitter path is connected between the input to the voltage controlled switching element and ground/the low side of the DC power supply.
21. An ultrasonic generator circuit as claimed in any- preceding claim, wherein the voltage controlled switching element is an integrated gate bipolar transition.
22. An ultrasonic generator circuit comprising a DC supply, an ultrasonic transducer, and a power oscillator circuit connected to the ultrasonic transducer for driving thereof, the power oscillator circuit comprising a resonant circuit which comprises an inductance and a switching transistor connected in series across the DC supply, a capacitance, and a feedback transformer whose primary winding is connected in series with the inductance, the secondary winding of the feedback transformer being connected via a series combination of a feedback capacitor and a feedback inductance to feedback circuitry for applying a feedback signal to the switching transistor, wherein for providing protection of the circuit against excess voltage or current, an electronically controlled switching element is connected across a point between the feedback capacitor and the feedback inductance and ground, the controlling input of the switching element being connected to detector means for detecting an excess voltage or current condition, such that the switching element is normally open circuit but is 48 controlled to close by the detector means upon detection of an excess voltage or current condition to divert the feedback signal to the low power line.
23. An ultrasonic generator system incorporating an ultrasonic generator circuit as claimed in any preceding claim.
24. An ultrasonic generator circuit as herein described with reference to, and as illustrated in, Figs. 6 to 9.
25. An ultrasonic generator system substantially as herein described with reference to, and as illustrated in Figs. 2 to 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9901400A GB2333193B (en) | 1996-08-01 | 1997-08-01 | Ultrasonic generator circuit incorporating a power oscillator and a feedback loop |
| AU37032/97A AU3703297A (en) | 1996-08-01 | 1997-08-01 | Ultrasonic generator circuit incorporating a power oscillator and a feedback loop |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9616186.4 | 1996-08-01 | ||
| GBGB9616186.4A GB9616186D0 (en) | 1996-08-01 | 1996-08-01 | Untrasonic generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998005437A1 WO1998005437A1 (en) | 1998-02-12 |
| WO1998005437B1 true WO1998005437B1 (en) | 1998-03-19 |
Family
ID=10797860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1997/002052 WO1998005437A1 (en) | 1996-08-01 | 1997-08-01 | Ultrasonic generator circuit incorporating a power oscillator and a feedback loop |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU3703297A (en) |
| GB (1) | GB9616186D0 (en) |
| WO (1) | WO1998005437A1 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0222421D0 (en) * | 2002-09-27 | 2002-11-06 | Ratcliff Henry K | Advanced ultrasonic processor |
| US8182501B2 (en) | 2004-02-27 | 2012-05-22 | Ethicon Endo-Surgery, Inc. | Ultrasonic surgical shears and method for sealing a blood vessel using same |
| US20060079879A1 (en) | 2004-10-08 | 2006-04-13 | Faller Craig N | Actuation mechanism for use with an ultrasonic surgical instrument |
| US20070191713A1 (en) | 2005-10-14 | 2007-08-16 | Eichmann Stephen E | Ultrasonic device for cutting and coagulating |
| US8057498B2 (en) | 2007-11-30 | 2011-11-15 | Ethicon Endo-Surgery, Inc. | Ultrasonic surgical instrument blades |
| US8808319B2 (en) | 2007-07-27 | 2014-08-19 | Ethicon Endo-Surgery, Inc. | Surgical instruments |
| US8523889B2 (en) | 2007-07-27 | 2013-09-03 | Ethicon Endo-Surgery, Inc. | Ultrasonic end effectors with increased active length |
| US9044261B2 (en) | 2007-07-31 | 2015-06-02 | Ethicon Endo-Surgery, Inc. | Temperature controlled ultrasonic surgical instruments |
| US8430898B2 (en) | 2007-07-31 | 2013-04-30 | Ethicon Endo-Surgery, Inc. | Ultrasonic surgical instruments |
| US8512365B2 (en) | 2007-07-31 | 2013-08-20 | Ethicon Endo-Surgery, Inc. | Surgical instruments |
| US10010339B2 (en) | 2007-11-30 | 2018-07-03 | Ethicon Llc | Ultrasonic surgical blades |
| US8319400B2 (en) | 2009-06-24 | 2012-11-27 | Ethicon Endo-Surgery, Inc. | Ultrasonic surgical instruments |
| US8951272B2 (en) | 2010-02-11 | 2015-02-10 | Ethicon Endo-Surgery, Inc. | Seal arrangements for ultrasonically powered surgical instruments |
| US9820768B2 (en) | 2012-06-29 | 2017-11-21 | Ethicon Llc | Ultrasonic surgical instruments with control mechanisms |
| US10226273B2 (en) | 2013-03-14 | 2019-03-12 | Ethicon Llc | Mechanical fasteners for use with surgical energy devices |
| GB2521229A (en) * | 2013-12-16 | 2015-06-17 | Ethicon Endo Surgery Inc | Medical device |
| US11020140B2 (en) | 2015-06-17 | 2021-06-01 | Cilag Gmbh International | Ultrasonic surgical blade for use with ultrasonic surgical instruments |
| US10357303B2 (en) | 2015-06-30 | 2019-07-23 | Ethicon Llc | Translatable outer tube for sealing using shielded lap chole dissector |
| US10245064B2 (en) | 2016-07-12 | 2019-04-02 | Ethicon Llc | Ultrasonic surgical instrument with piezoelectric central lumen transducer |
| USD847990S1 (en) | 2016-08-16 | 2019-05-07 | Ethicon Llc | Surgical instrument |
| US10952759B2 (en) | 2016-08-25 | 2021-03-23 | Ethicon Llc | Tissue loading of a surgical instrument |
| US10736649B2 (en) | 2016-08-25 | 2020-08-11 | Ethicon Llc | Electrical and thermal connections for ultrasonic transducer |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1095436A (en) * | ||||
| US3727112A (en) * | 1969-08-29 | 1973-04-10 | Surgical Design Corp | Generator for producing ultrasonic energy |
| GB8333696D0 (en) * | 1983-12-17 | 1984-01-25 | Glasshome Ltd | Transistor amplifier |
-
1996
- 1996-08-01 GB GBGB9616186.4A patent/GB9616186D0/en active Pending
-
1997
- 1997-08-01 AU AU37032/97A patent/AU3703297A/en not_active Abandoned
- 1997-08-01 WO PCT/GB1997/002052 patent/WO1998005437A1/en active Application Filing
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