CN102274053A - Ultrasonic handle tuning method for cataract ultrasonic emulsification instrument - Google Patents
Ultrasonic handle tuning method for cataract ultrasonic emulsification instrument Download PDFInfo
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Abstract
The invention discloses an ultrasonic handle tuning method for a cataract ultrasonic emulsification instrument. In the tuning method, an ultrasonic handle in a cataract ultrasonic emulsification instrument is tuned through the amplitude frequency characteristics of a resonant network; the resonant network is composed of a first switching tube, a second switching tube, a not gate, an output transformer, a matching inductor and the ultrasonic handle; a CPU (Central Processing Unit) outputs a frequency signal to carry out frequency sweeping on the resonant network, the direct current power supply at both ends of the resonant network is monitored by an A/D (Analog to Digital) converter, and the frequency corresponding to the minimum voltage value of the direct current power supply is the initial resonant frequency output by the CPU; and in the working process of the ultrasonic handle, the minimum voltage value of the direct current power supply is tracked so as to track the resonant frequency of the ultrasonic handle. The invention also discloses a process for tracking the resonant frequency of the ultrasonic handle. The invention has the advantages of high anti-jamming capability, large tracking range and easy implementation.
Description
Technical field
The present invention relates to a kind of tuning system that is used for ultrasonic surgical apparatus, relate in particular to the tuning system of ultrasonic handpiece in a kind of cataract ultrasonic emulsification instrument.
Background technology
Cataract ultrasonic emulsification instrument is to utilize the vibration at ultrasonic emulsification handle tip to come broken muddy lens tissue, makes its emulsifying.Under resonant condition, the vibration at ultrasonic emulsification handle tip is the strongest, delivery efficiency is the highest, and therefore, the resonance of ultrasonic emulsification handle is the essential condition that the ultrasonic emulsification function realizes.The resonant frequency of ultrasonic emulsification handle can change along with the variation of factors such as temperature, loading condition, and following the tracks of resonant frequency and keeping the resonance of ultrasonic emulsification handle is the prerequisite of the stable output of ultrasonic power.
The equiva lent impedance Z of resonant network is made up of the resistance R and the reactance X of equivalence, and its expression formula is suc as formula (1)
Z＝R+jX (1)
When the reaction component X when circuit resonance was zero, then its equiva lent impedance Z showed as pure resistance R, and its both end voltage is a same phase with the electric current of the network of flowing through.Traditional tuning methods utilizes this phase-frequency characteristic, keeps voltage and electric current homophase by technology such as phaselocked loops, reaches tuning and purpose frequency-tracking.Adopt said method to carry out tuning and frequency-tracking, though its principle is very clear and definite, but needing to realize by processes such as sampling, filtering, phase demodulation, integration, voltage-controlled concussions, except that structure than the complexity, accidental interference just may produce the off resonance phenomenon, therefore capacity of resisting disturbance a little less than, its following range and catching range all are restricted.
Summary of the invention
At above-mentioned prior art, the invention provides a kind of tuning methods that is used for the cataract ultrasonic emulsification instrument ultrasonic handpiece.The present invention can follow the tracks of the resonant frequency of ultrasonic handpiece effectively, realizes simple and reliablely, and is easy to filtering interference signals, improved capacity of resisting disturbance greatly, and the frequency-tracking scope is big.
In order to solve the problems of the technologies described above, the present invention is used for the technical scheme that the tuning methods of cataract ultrasonic emulsification instrument ultrasonic handpiece is achieved: this tuning methods utilizes the amplitude-frequency characteristic of resonant network to carry out tuning to the ultrasonic handpiece in the cataract ultrasonic emulsification instrument, described resonant network is by first switching tube, the second switch pipe, not gate, output transformer, coupling inductance and ultrasonic handpiece are formed, by a CPU output frequency signal described resonant network is carried out frequency sweep, and monitor the dc source at described resonant network two ends by an A/D converter, be the original resonance frequency of described CPU output with the frequency of the voltage minimum correspondence of described dc source; When described ultrasonic handpiece is worked, realize following the tracks of the resonant frequency of ultrasonic handpiece with the voltage minimum of following the tracks of described dc source.
Tuning methods of the present invention, wherein, described CPU output frequency signal to the process that described resonant network carries out frequency sweep is: described CPU exports the square wave of a certain frequency and controls first switching tube, simultaneously, described CPU is through described non-gate control second switch pipe, make first switching tube and second switch pipe alternate conduction, produce alternating current on the former limit of described output transformer, and then induce alternating voltage V at described output transformer secondary
L, described alternating voltage V
LInput voltage as resonant network, to drive described ultrasonic handpiece, described CPU improves constantly output frequency with stepping Δ f, detects described dc source and each frequency corresponding output voltage V by described A/D converter simultaneously, and the frequency of getting the minimum voltage correspondence is as original resonance frequency.
Tuning methods of the present invention, wherein, the process of following the tracks of the resonant frequency of described ultrasonic handpiece is: emulsification procedure begins, and described CPU at first exports original resonance frequency, and detects the voltage at described resonant network two ends; Described then CPU improves output frequency with stepping Δ f, and detects the voltage at described resonant network two ends this moment, compares with last magnitude of voltage, if the latter is little, then described CPU continues to improve output frequency with identical stepping Δ f; If the latter is big, then described CPU reduces output frequency with identical stepping Δ f; Repeat this operation, follow the tracks of the voltage minimum at described resonant network two ends all the time, make described super newborn handle be in resonant condition constantly, thereby the stable output of guaranteed output finishes until emulsification procedure.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention adopts the method for direct monitoring dc source output voltage, can effectively follow the tracks of the resonant frequency of ultrasonic handpiece, realize simple and reliable, and, disturb for accidental sharp cutting edge of a knife or a sword because the change frequency of DC voltage is easy to filtering interference signals far below the interfering signal frequency, only may cause the fluctuation that moment is small, and can not influence whole trend, thereby improved capacity of resisting disturbance greatly, and the frequency-tracking scope is big.
Usually, in the work of ultrasonic emulsification instrument, the spike that produces when disturbing mainly from the high-frequency noise of digital circuit and high power switching power supply work disturbs.Since among the present invention be output with dc source as feedback quantity, its change frequency scope is about 100Hz, and the ever-present interference of digital circuit is generally more than 1MHz.Both differ greatly at frequency range, are easy to filtering interference signals; Disturb for spike, if just in time catch up with sampling when disturb, then may cause the judgement of CPU mistake and output frequency is regulated to the direction of mistake, this mistake will be corrected when sampling next time, the accumulation that can not make the mistake can not influence the operate as normal of ultrasonic handpiece.In the technical schemes such as phaselocked loop of utilizing phase-frequency characteristic in the prior art, a spike disturbs the burr that causes, the judgement that may make the mistake, for example, in fact electric current is ahead of voltage, disturbs to make phase discriminator make opposite judgement, and the output frequency of phaselocked loop is regulated to the direction of mistake, and can continue to regulate, until imbalance to this direction.Though Fig. 3 has illustrated electric current leading voltage all the time, in case a spike burr occurs, will judge by accident and be the electric current lagging voltage, and circuit can't correct automatically, can continue mistake, until imbalance always.In addition, traditional phase-locked loop method is because voltage-controlled oscillator (VCO) has working range, thereby output frequency has scope restriction, and utilizes tuning circuit of the present invention to realize that tuning its output frequency is not limited; In addition, the phase-frequency characteristic of resonant network has the curve form shown in Fig. 4-1, when frequency is crossed F
D, will cause off resonance in the other direction to following the trail of.And the amplitude-versus-frequency curve that tuning circuit of the present invention produced meets the tracking condition very on a large scale, and shown in Fig. 4-2, so following range is big.
Description of drawings
Fig. 1. be the schematic diagram of tuning circuit among the present invention;
Fig. 2 is the equivalent circuit diagram of power supply and resonant network among Fig. 1;
Fig. 3 is that prior art utilizes the phaselocked loop of phase-frequency characteristic to disturb the sketch map that erroneous judgement occurs owing to spike;
Fig. 4-the 1st, prior art phase-frequency characteristic curve;
Fig. 4-the 2nd, the amplitude-versus-frequency curve that tuning circuit produced among the present invention;
Fig. 5 is the main flow chart that utilizes tuning circuit realization frequency-tracking among the present invention.
Among the figure:
1---first switching tube 2---second switch pipe 3---dc source
4---output transformer 5---coupling inductance 6---ultrasonic handpiece
7---A/D converter 8---CPU 9---not gates
The specific embodiment
Below in conjunction with the specific embodiment the present invention is done to describe in further detail.
As shown in Figure 1, the present invention is used for the tuning methods of cataract ultrasonic emulsification instrument ultrasonic handpiece, this tuning methods utilizes the amplitude-frequency characteristic of resonant network to carry out tuning to the ultrasonic handpiece in the cataract ultrasonic emulsification instrument, described resonant network is by first switching tube 1, second switch pipe 2, not gate 9, output transformer 4, coupling inductance 5 and ultrasonic handpiece 6 are formed, described first switching tube 1 and described second switch pipe 2 all adopt the high-power V metal-oxide-semiconductor, require conducting resistance very little, its conducting resistance＜0.1 Ω, all can to adopt model be the switching tube of IRF540 for first switching tube 1 and described second switch pipe 2 as described, described first switching tube 1 is connected the input of described not gate 9, described second switch pipe 2 is connected the outfan of described not gate 9, described CPU8 and described first switching tube 1, described not gate 9 is connected with described A/D converter 7; By a CPU8 output frequency signal described resonant network is carried out frequency sweep, and the dc source 3 by the described resonant network of an A/D converter 7 monitoring two ends, be the original resonance frequency of described CPU8 output with the frequency of the voltage minimum correspondence of described dc source 3; When described ultrasonic handpiece 6 is worked, realize following the tracks of the resonant frequency of ultrasonic handpiece 6 with the voltage minimum of following the tracks of described dc source 3.Described CPU8 output frequency signal to the process that described resonant network carries out frequency sweep is: described CPU8 exports the square wave of a certain frequency and controls first switching tube 1, simultaneously, described CPU8 is through described not gate 9 control second switch pipes 2, make first switching tube 1 and second switch pipe 2 alternate conduction, produce alternating current on described output transformer 4 former limits, and then induce alternating voltage V at described output transformer 4 secondary
L, described alternating voltage V
LInput voltage as resonant network, to drive described ultrasonic handpiece 6, described CPU8 improves constantly output frequency with stepping Δ f, detect described dc source 3 and each frequency corresponding output voltage V by described A/D converter 7 simultaneously, the frequency of getting the minimum voltage correspondence is as original resonance frequency.There is certain internal resistance in dc source 3 wherein, and the voltage V of imperfect dc source 3 outputs sends among the CPU8 through described A/D converter 7, and described CPU8 gets the pairing frequency of minimum voltage as output frequency by analyzing relatively.
Described coupling inductance 5 in the circuit of the present invention is the capacitive reactance compositions that are used to offset ultrasonic handpiece 6, and how to determine that according to the parameter of ultrasonic handpiece 6 parameter of this coupling inductance 5 belongs to general knowledge well-known to those skilled in the art, does not repeat them here.
The operation principle of tuning methods of the present invention is: among Fig. 1, described coupling inductance 5 is formed a resonance circuit with described ultrasonic handpiece 6, can equivalence be the series connection form of resistance 11 shown in Fig. 2 and reactance 12 through conversion, and its total impedance is Z.And output transformer 4 and front-end circuit thereof can equivalence be imperfect alternating-current voltage source 13.Have this moment:
In the formula (2):
| V
L| be V
LMould;
| Vi| is the mould of equivalent alternating current power supply output voltage V i;
R
0' be the internal resistance of equivalent alternating current power supply.
Can derive in the formula 2 and work as | Z| hour, | V
L| minimum.According to formula 3 as can be known, when reactance is zero, just during network resonance | the Z| minimum.Thereby derive when network resonance, | V
L| minimum.
According to the characteristic of output transformer 4, its original edge voltage and secondary voltage are positively related, and the original edge voltage amplitude is by the output voltage V decision of dc source 3.Therefore V and | V
L| have identical Changing Pattern.
According to above derivation as can be known, utilize the amplitude-frequency characteristic of resonant network, can access the resonant frequency of network equally.Resonant network is regarded in the part unification that will comprise output transformer, coupling inductance and ultrasonic handpiece as, then can directly utilize the minima that detects DC voltage, obtains the resonant frequency of resonant network.
As shown in Figure 5, the process of the resonant frequency of the described ultrasonic handpiece 6 of realization tracking is in the tuning methods of the present invention:
When emulsification procedure began, described CPU8 at first obtained frequency sweep the frequency f of voltage minimum correspondence
0Provide as the initial resonance of ultrasonic handpiece is sharp, and detect the voltage V at described resonant network two ends, with seasonal Vs=V; Described then CPU8 improves output frequency with stepping Δ f, and detects the output voltage V at described resonant network two ends this moment, compares with last magnitude of voltage, if the latter is little, that is: V≤Vs then makes Vs=V, and described CPU8 continues to improve output frequency with identical stepping Δ f; If the latter is big, that is: V＞Vs also makes Vs=V, and then described CPU8 reduces output frequency with identical stepping Δ f; Repeat this operation, follow the tracks of the voltage minimum at described resonant network two ends all the time, make described super newborn handle 6 constantly be in resonant condition, thereby the stable output of guaranteed output finishes until emulsification procedure.
The present invention adopts the method for direct monitoring dc source output voltage, can effectively follow the tracks of the resonant frequency of ultrasonic handpiece, realize simple and reliable, and, disturb for accidental sharp cutting edge of a knife or a sword because the change frequency of DC voltage is easy to filtering interference signals far below the interfering signal frequency, only may cause the fluctuation that moment is small, and can not influence whole trend, thereby improved capacity of resisting disturbance greatly, and the frequency-tracking scope is big.
Although top invention has been described in conjunction with figure; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (3)
1. tuning methods that is used for the cataract ultrasonic emulsification instrument ultrasonic handpiece, it is characterized in that: this tuning methods utilizes the amplitude-frequency characteristic of resonant network to carry out tuning to the ultrasonic handpiece in the cataract ultrasonic emulsification instrument, described resonant network is by first switching tube (1), second switch pipe (2), not gate (9), output transformer (4), coupling inductance (5) and ultrasonic handpiece (6) are formed, by a CPU (8) output frequency signal described resonant network is carried out frequency sweep, and the dc source (3) by the described resonant network of an A/D converter (7) monitoring two ends, be the original resonance frequency of described CPU (8) output with the frequency of the voltage minimum correspondence of described dc source (3); When described ultrasonic handpiece (6) is worked, realize following the tracks of the resonant frequency of ultrasonic handpiece (6) with the voltage minimum of following the tracks of described dc source (3).
2. tuning methods according to claim 1, it is characterized in that: described CPU (8) output frequency signal to the process that described resonant network carries out frequency sweep is: the square wave of a certain frequency of described CPU (8) output is controlled first switching tube (1), simultaneously, described CPU (8) is through described not gate (9) control second switch pipe (2), make first switching tube (1) and second switch pipe (2) alternate conduction, produce alternating current on the former limit of described output transformer (4), and then induce alternating voltage V at described output transformer (4) secondary
L, described alternating voltage V
LInput voltage as resonant network, to drive described ultrasonic handpiece (6), described CPU (8) improves constantly output frequency with stepping Δ f, detect described dc source (3) and each frequency corresponding output voltage V by described A/D converter (7) simultaneously, the frequency of getting the minimum voltage correspondence is as original resonance frequency.
3. tuning methods according to claim 2 is characterized in that: the process of following the tracks of the resonant frequency of described ultrasonic handpiece (6) is:
Emulsification procedure begins, and described CPU (8) at first exports original resonance frequency, and detects the voltage at described resonant network two ends; Described then CPU (8) improves output frequency with stepping Δ f, and detects the voltage at described resonant network two ends this moment, compares with last magnitude of voltage, if the latter is little, then described CPU (8) continues to improve output frequency with identical stepping Δ f; If the latter is big, then described CPU (8) reduces output frequency with identical stepping Δ f; Repeat this operation, follow the tracks of the voltage minimum at described resonant network two ends all the time, make described ultrasonic handpiece (6) constantly be in resonant condition, thereby the stable output of guaranteed output finishes until emulsification procedure.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105772312A (en) * | 2016-05-05 | 2016-07-20 | 深圳市尚进电子科技有限公司 | Ultrasonic aromatization sheet frequency sweep circuit and method |
| CN108580152A (en) * | 2018-06-13 | 2018-09-28 | 西安拓尔微电子有限责任公司 | A kind of determination method of atomizer transduction piece resonance point |
| CN108802529A (en) * | 2018-08-23 | 2018-11-13 | 西安拓尔微电子有限责任公司 | A kind of fast determination method of atomizer transduction piece resonance point |
| CN112754604A (en) * | 2019-11-05 | 2021-05-07 | 重庆迈科唯医疗科技有限公司 | Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system |
| CN114290685A (en) * | 2021-12-30 | 2022-04-08 | 上海骄成超声波技术股份有限公司 | Ultrasonic generator and ultrasonic system |
| CN115227341A (en) * | 2022-06-17 | 2022-10-25 | 江苏邦士医疗科技有限公司 | Ultrasonic and plasma dual-output surgical operation system |
| CN115252059A (en) * | 2022-05-25 | 2022-11-01 | 江苏邦士医疗科技有限公司 | Ultrasonic surgical operation system |
| CN116725630A (en) * | 2022-10-28 | 2023-09-12 | 江西远赛医疗科技有限公司 | Initial resonant frequency determining method and device, electronic equipment and storage medium |
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| CN105772312A (en) * | 2016-05-05 | 2016-07-20 | 深圳市尚进电子科技有限公司 | Ultrasonic aromatization sheet frequency sweep circuit and method |
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| CN108802529A (en) * | 2018-08-23 | 2018-11-13 | 西安拓尔微电子有限责任公司 | A kind of fast determination method of atomizer transduction piece resonance point |
| CN112754604A (en) * | 2019-11-05 | 2021-05-07 | 重庆迈科唯医疗科技有限公司 | Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system |
| CN112754604B (en) * | 2019-11-05 | 2022-02-01 | 重庆迈科唯医疗科技有限公司 | Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system |
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| CN114290685A (en) * | 2021-12-30 | 2022-04-08 | 上海骄成超声波技术股份有限公司 | Ultrasonic generator and ultrasonic system |
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| CN115252059B (en) * | 2022-05-25 | 2024-02-27 | 邦士医疗科技股份有限公司 | Ultrasonic surgical operation system |
| CN115227341A (en) * | 2022-06-17 | 2022-10-25 | 江苏邦士医疗科技有限公司 | Ultrasonic and plasma dual-output surgical operation system |
| CN115227341B (en) * | 2022-06-17 | 2024-04-19 | 邦士医疗科技股份有限公司 | Ultrasonic and plasma double-output surgical operation system |
| CN116725630A (en) * | 2022-10-28 | 2023-09-12 | 江西远赛医疗科技有限公司 | Initial resonant frequency determining method and device, electronic equipment and storage medium |
| CN116725630B (en) * | 2022-10-28 | 2024-04-19 | 江西远赛医疗科技有限公司 | Initial resonant frequency determining method and device, electronic equipment and storage medium |
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