Ultrasonic surgical instrument with modulator
First Claim
Patent Images
1. A surgical instrument, comprising:
- a transducer configured to produce vibrations along a longitudinal axis at a predetermined frequency in response to a modulated drive signal;
an end effector coupled to the transducer extending along the longitudinal axis, the end effector comprising a body having a proximal end and a distal end, the distal end is movable relative to the longitudinal axis by the vibrations produced by the transducer; and
a multiplier-type modulator comprising a first input to receive a current set point signal and a second input to receive a modulation waveform, the multiplier-type modulator configured to generate a modulated drive signal by forming the product of the current set point signal and the modulation waveform, wherein the distal end of the end effector is movable in response to the vibrations produced by the transducer in response to the modulated drive signal.
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Abstract
A surgical instrument includes a transducer configured to produce vibrations along a longitudinal axis at a predetermined frequency. An end effector is adapted to couple to the transducer and extends along the longitudinal axis. The end effector includes a body having a proximal end and a distal end. The distal end is movable relative to the longitudinal axis by the vibrations produced by the transducer. A drive module is coupled to the transducer to generate a modulated drive signal. The distal end of the end effector is movable in response to the vibrations produced by the transducer in response to the modulated drive signal.
542 Citations
23 Claims
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1. A surgical instrument, comprising:
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a transducer configured to produce vibrations along a longitudinal axis at a predetermined frequency in response to a modulated drive signal; an end effector coupled to the transducer extending along the longitudinal axis, the end effector comprising a body having a proximal end and a distal end, the distal end is movable relative to the longitudinal axis by the vibrations produced by the transducer; and a multiplier-type modulator comprising a first input to receive a current set point signal and a second input to receive a modulation waveform, the multiplier-type modulator configured to generate a modulated drive signal by forming the product of the current set point signal and the modulation waveform, wherein the distal end of the end effector is movable in response to the vibrations produced by the transducer in response to the modulated drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A surgical instrument, comprising:
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a transducer configured to produce vibrations along a longitudinal axis at a predetermined frequency in response to a phase modulated drive signal; an end effector coupled to the transducer extending along the longitudinal axis, the end effector comprising a body having a proximal end and a distal end, the distal end is movable relative to the longitudinal axis by the vibrations produced by the transducer; and a phase detector to determine a phase difference between a voltage measurement signal and a current measurement signal of the phase modulated drive signal and to output a relative phase signal proportional to the difference between the phase of the voltage measurement signal and the current measurement signal; wherein the distal end of the end effector is movable in response to the vibrations produced by the transducer in response to the phase modulated drive signal; and a summer comprising a first input to receive the relative phase signal and a second input to receive a phase modulation waveform to vary the phase of the modulated drive signal, the summer configured to generate an error signal proportional to the difference between the relative phase signal and the phase modulation waveform signal. - View Dependent Claims (10, 11, 12, 19)
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13. An ultrasonic signal generator, comprising:
a multiplier-type modulator comprising a first input to receive a current set point signal and a second input to receive a modulation waveform, the multiplier-type modulator configured to generate a modulated drive signal by forming the product of the current set point signal and the modulation waveform, wherein a distal end of an end effector coupled to the multiplier-type modulator is movable in response to the modulated drive signal. - View Dependent Claims (14, 15, 16, 17, 18)
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20. An ultrasonic signal generator, comprising:
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a phase detector to determine a phase difference between a voltage measurement signal and a current measurement signal of a phase modulated drive signal and to output a relative phase signal proportional to the difference between the phase of the voltage measurement signal and the current measurement signal, wherein a distal end of an end effector coupled to the phase detector is movable in response to the phase modulated drive signal; and a summer comprising a first input to receive the relative phase signal and a second input to receive a phase modulation waveform to vary the phase of the modulated drive signal, the summer configured to generate an error signal proportional to the difference between the relative phase signal and the phase modulation waveform signal. - View Dependent Claims (21, 22, 23)
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Specification