Patent US5447509A successfully refreshed from Google Patents.
US5447509A
Expired / Lapsed
US
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Ultrasound catheter system having modulated output with feedback control
Assignee: Abbott Cardiovascular Systems Inc
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Filing: 1993-10-04
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Granted: 1995-09-05
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Expires: 2013-10-04
Abstract
Abstract A method and apparatus for driving an ultrasound transducer coupled to an ultrasound transmission disposed within an elongate catheter has a modulated output and utilizes feedback control. A modulating signal varying in amplitude and continuous in duration modulates an ultrasound transducer drive signal. The resulting modulated ultrasound transducer drive signal is likewise continuous in duration such that it lacks the abrupt accelerations which cause stress to be applied to the ultrasound transmission member in prior art devices. The current of the modulated drive signal is monitored and the voltage thereof is varied in response to changes in the current in order to provide feedback control. A transmission member breakage alarm provides an indication of transmission member breakage in the event that any comparison of the drive energy to the feedback control signal indicates that the desired ultrasonic vibration has been reached at a drive energy level less than the minimum drive energy level typically desired for such desired ultrasound vibration when the ultrasound transmission member is intact.
Inventors
- 👤 Timothy C. Mills
- 👤 Henry Nita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:06
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/22; A61B17/22004; A61B17/22012; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B2017/00017; A61B2017/00115; A61B2017/00119; A61B2017/00137; A61B2017/00141; A61B2017/00146; A61B2017/00831; A61B2017/0084; A61B2017/00849; A61B2017/00973; A61B2017/22038; A61B2017/22039; A61B2017/22041; A61B2018/00005; A61B2018/00011; A61B2217/00; A61B2217/002; A61B2217/007; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30092; A61F2210/00; A61F2210/0014; A61F2210/0023; A61F2210/0042; A61M; A61M25/00; A61M25/01; A61M2025/0183; A61M3/00; A61M3/02; A61M3/0279
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
106 words
A method for driving an ultrasound transducer coupled to an ultrasound catheter having an ultrasound transmission member extending longitudinally therethrough such that the distal end of the ultrasound transmission member oscillates at a desired operational ultrasound frequency, said method comprising the steps of: a) providing a modulating signal, the modulating signal varying in amplitude and being continuous in duration; b) applying said modulating signal to an ultrasound transducer drive signal so as to modulate the ultrasound transducer drive signal; and c) wherein the resulting modulated ultrasound transducer drive signal is continuous in duration and devoid of high frequency components which exceed the desired operational ultrasound frequency.
Claim 2
Independent Claim
106 words
A method for driving an ultrasound transducer coupled to an ultrasound catheter having an ultrasound transmission member extending longitudinally therethrough such that the distal end of the ultrasound transmission member oscillates at a desired operational ultrasound frequency, said method comprising the steps of: a) providing a modulating signal, the modulating signal varying in amplitude and being continuous in duration; b) applying said modulating signal to an ultrasound transducer drive signal so as to modulate the ultrasound transducer drive signal; and c) wherein the resulting modulated ultrasound transducer drive signal is continuous in duration and devoid of high frequency components which exceed the desired operational ultrasound frequency.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the step of providing a modulating signal further comprises the step of providing a sine wave.
Claim 4
Dependent Claim
72 words
The method of claim 1 further comprising the steps of: a) monitoring the current of the modulated drive signal; b) varying the amplitude of the voltage of the modulated drive signal in response to changes in the current thereof; and c) wherein varying the amplitude of the voltage of the modulated drive signal in response to changes in the current thereof enhances ablation by reducing undesirable variations in ultrasound energy used therefor.
Claim 5
Dependent Claim
35 words
The method of claim 1 further comprising the step of selecting the modulating signal from a plurality of different modulating signals, each of the different modulating signals being an optimized function for a particular application.
Claim 6
Dependent Claim
129 words
The method as recited in claim 1 further comprising the steps of: a) measuring a feedback control signal representing the ultrasonic vibration at the distal-most extent of the ultrasound transmission member; b) defining the minimal drive energy typically required to obtain a desired induced feedback control signal when the ultrasound transmission member is unbroken; c) periodically or continually comparing the drive energy being delivered to the induced feedback control signal being received; and d) providing a breakage alarm in the event that any comparison of said drive energy to said induced feedback control signal indicates that said desired ultrasonic vibration has been reached at a drive energy level less than said minimum drive energy level typically required for such desired ultrasound vibration when said ultrasound transmission member is intact.
Claim 7
Dependent Claim
20 words
The method of claim 1, further comprising the step of optimizing said modulating signal for the ablation of atherosclerotic plaque.
Claim 8
Dependent Claim
20 words
The method of claim 1, further comprising the step of optimizing said modulating signal for the ablation of thrombotic matter.
Claim 9
Independent Claim
80 words
A method for therapeutic treatment of a patient, said method comprising the steps of: a) positioning the distal end of an elongate ultrasound transmission member at a location within a mammalian body; b) applying a modulated electrical drive signal to an ultrasound transducer, the drive signal varying in amplitude and being continuous in duration; and c) transmitting the modulated ultrasound energy provided by the ultrasound transducer through an elongate ultrasound transmission member to a desired location within the mammalian body.
Claim 10
Independent Claim
80 words
A method for therapeutic treatment of a patient, said method comprising the steps of: a) positioning the distal end of an elongate ultrasound transmission member at a location within a mammalian body; b) applying a modulated electrical drive signal to an ultrasound transducer, the drive signal varying in amplitude and being continuous in duration; and c) transmitting the modulated ultrasound energy provided by the ultrasound transducer through an elongate ultrasound transmission member to a desired location within the mammalian body.
Claim 11
Dependent Claim
19 words
The method of claim 8 further comprising the step of disposing said ultrasound transmission member within a catheter sheath.
Claim 12
Dependent Claim
32 words
The method of claim 8 wherein the step of applying a modulated ultrasound transducer drive signal comprises modulating a constant amplitude ultrasound transducer drive signal with a varying and continuous modulating signal.
Claim 13
Dependent Claim
39 words
The method of claim 8 wherein the step of positioning the distal end of an ultrasound transmission member within a mammalian body comprises positioning the distal end of the ultrasound transmission member within a lumen of a blood vessel.
Claim 14
Independent Claim
55 words
A method for driving an ultrasound transducer coupled to an ultrasound transmission member, the method comprising the steps of: a) providing an ultrasound transducer drive signal; b) monitoring the current of said ultrasound transducer drive signal; and c) varying the voltage of said ultrasound transducer drive signal in response to changes in the current thereof.
Claim 15
Independent Claim
55 words
A method for driving an ultrasound transducer coupled to an ultrasound transmission member, the method comprising the steps of: a) providing an ultrasound transducer drive signal; b) monitoring the current of said ultrasound transducer drive signal; and c) varying the voltage of said ultrasound transducer drive signal in response to changes in the current thereof.
Claim 16
Dependent Claim
129 words
The method as recited in claim 12 further comprising the steps of: a) measuring a feedback control signal representing the ultrasonic vibration at the distal-most extent of the ultrasound transmission member; b) defining the minimal drive energy typically required to obtain a desired induced feedback control signal when the ultrasound transmission member is unbroken; c) periodically or continually comparing the drive energy being delivered to the induced feedback control signal being received; and d) providing a breakage alarm in the event that any comparison of said drive energy to said induced feedback control signal indicates that said desired ultrasonic vibration has been reached at a drive energy level less than said minimum drive energy level typically required for such desired ultrasound vibration when said ultrasound transmission member is intact.
Claim 17
Independent Claim
78 words
An apparatus for providing ultrasound for use in therapeutic procedures, the apparatus comprising: a) a modulated ultrasound transducer drive signal generator for providing a continuous and varying modulated ultrasound transducer drive signal; b) an ultrasound transducer receiving said modulated ultrasound transducer drive signal and providing an ultrasound output; and c) an ultrasound transmission member having a distal tip, attached to said ultrasound transducer for transmitting ultrasound from said ultrasound transducer to an intracorporeal location where required for therapy.
Claim 18
Independent Claim
78 words
An apparatus for providing ultrasound for use in therapeutic procedures, the apparatus comprising: a) a modulated ultrasound transducer drive signal generator for providing a continuous and varying modulated ultrasound transducer drive signal; b) an ultrasound transducer receiving said modulated ultrasound transducer drive signal and providing an ultrasound output; and c) an ultrasound transmission member having a distal tip, attached to said ultrasound transducer for transmitting ultrasound from said ultrasound transducer to an intracorporeal location where required for therapy.
Claim 19
Dependent Claim
22 words
The apparatus as recited in claim 14 further comprising a catheter substantially covering at least a portion of said ultrasound transmission member.
Claim 20
Dependent Claim
21 words
The apparatus as recited in claim 14 further comprising a display for displaying information regarding the modulated ultrasound transducer drive signal.
Claim 21
Dependent Claim
65 words
The apparatus as recited in claim 14 wherein said modulated ultrasound transducer drive signal generator comprises: a) a modulating signal generator for providing a varying and continuous modulating signal; b) an ultrasound transducer drive signal generator for providing an ultrasound drive signal; and c) a modulator for applying the modulating signal to the drive signal so as to generate a modulated ultrasound transducer drive signal.
Claim 22
Dependent Claim
70 words
The apparatus as recited in claim 17 further comprising: a) a current sensor coupled to the modulator for sensing current of the modulated ultrasound transducer drive signal; and b) a feedback control coupled to the current sensor and the ultrasound transducer drive signal generator for varying the voltage of the ultrasound transducer drive signal in response to changes in power delivered at the distal tip of the ultrasound transmission member.
Claim 23
Dependent Claim
173 words
In an ultrasonic system for ultrasonic ablation of matter within an anatomical structure of a mammalian body, said system comprising an ultrasound transducer coupled to an elongate ultrasound delivery catheter having an ultrasound transmitting member extending longitudinally therethrough, a method of detecting breakage of said ultrasound transmission member during use, said method comprising the steps of: a) measuring a feedback control signal representing the ultrasonic vibration at the distal-most extent of the ultrasound transmission member; b) defining the minimal drive energy typically required to obtain a desired induced feedback control signal when the ultrasound transmission member is unbroken; c) periodically or continually comparing the drive energy being delivered to the induced feedback control signal being received; and d) providing a breakage alarm in the event that any comparison of said drive energy to said induced feedback control signal indicates that said desired ultrasonic vibration has been reached at a drive energy level less than said minimum drive energy level typically required for such desired ultrasound vibration when said ultrasound transmission member is intact.
Claim 24
Dependent Claim
173 words
In an ultrasonic system for ultrasonic ablation of matter within an anatomical structure of a mammalian body, said system comprising an ultrasound transducer coupled to an elongate ultrasound delivery catheter having an ultrasound transmitting member extending longitudinally therethrough, a method of detecting breakage of said ultrasound transmission member during use, said method comprising the steps of: a) measuring a feedback control signal representing the ultrasonic vibration at the distal-most extent of the ultrasound transmission member; b) defining the minimal drive energy typically required to obtain a desired induced feedback control signal when the ultrasound transmission member is unbroken; c) periodically or continually comparing the drive energy being delivered to the induced feedback control signal being received; and d) providing a breakage alarm in the event that any comparison of said drive energy to said induced feedback control signal indicates that said desired ultrasonic vibration has been reached at a drive energy level less than said minimum drive energy level typically required for such desired ultrasound vibration when said ultrasound transmission member is intact.
References Cited (Backward Citations)
US3433226A
Cited
US3352303A
Cited
US3526219A
Cited
US3589363A
Cited
US3565062A
Cited
US3618594A
Cited
US3809093A
Cited
US3823717A
Cited
US3861391A
Cited
US4188952A
Cited
US4223676A
Cited
US4214586A
Cited
US4337090A
Cited
US4366819A
Cited
US4800876A
Cited
US4800876B1
Cited
US4431006A
Cited
US4565589A
Cited
US4474180A
Cited
US5302115A
Cited
US4587958A
Cited
US4665906A
Cited
US4505767A
Cited
US4692139A
Cited
US4979939A
Cited
US4587972A
Cited
US4960411A
Cited
US4589419A
Cited
US4750902A
Cited
US4957111A
Cited
US4924864A
Cited
US4741731A
Cited
US4794931A
Cited
US4821731A
Cited
US4867141A
Cited
US4764165A
Cited
US4808153A
Cited
US5058570A
Cited
US4988356A
Cited
US4967753A
Cited
US4811743A
Cited
US4967653A
Cited
US4841977A
Cited
US4799496A
Cited
US4898575A
Cited
US4917097A
Cited
US4870953A
Cited
US5163421A
Cited
US4844092A
Cited
US4920954A
Cited
US4919133A
Cited
US4989583A
Cited
US4966583A
Cited
US4923441A
Cited
US5061238A
Cited
US5255669A
Cited
US4936281A
Cited
US5151085A
Cited
US5022399A
Cited
US4896811A
Cited
US5029588A
Cited
US4998527A
Cited
US5076276A
Cited
US5069664A
Cited
US5211625A
Cited
US5100423A
Cited
WO1992010140A1
Cited
US5248296A
Cited
US5267954A
Cited
US5312328A
Cited
US5326342A
Cited
US5261877A
Cited
US5242385A
Cited
US5188589A
Cited
US5199943A
Cited
US5269297A
Cited
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