Method of maintaining constant movement of a cutting blade on an ultrasonic waveguide
First Claim
1. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide, which comprises:
- providing;
an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide, the ultrasonic transducer having a first capacitance in a parallel configuration with a series configuration of a resistance, an inductance, and a second capacitance, wherein the motional current flows through the series configuration;
a measurement circuit connected in a parallel configuration with the ultrasonic transducer and comprising a third capacitance in a parallel configuration with the first capacitance;
supplying current through a set of connection points of the parallel configuration with a variable power source to, thereby, create the motional current in the ultrasonic transducer, the variable power source being coupled to the third capacitance and the ultrasonic transducer; and
regulating the motional current with a current controller by varying an output of the power source based upon a product of the current flowing through the third capacitance multiplied by a ratio between a value of the first capacitance and a value of the third capacitance subtracted from a total current flowing into the ultrasonic transducer, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads.
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Accused Products
Abstract
A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide includes providing an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide, a measurement circuit connected in a parallel configuration with the ultrasonic transducer, and a variable power source operable to supply current through a set of connection points to the parallel configuration and thereby create the motional current in the ultrasonic transducer. Current is supplied through a set of connection points of the parallel configuration with the variable power source to, thereby, create the motional current in the ultrasonic transducer and the motional current is regulated with a current controller by varying an output of the power source, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads.
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Citations
14 Claims
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1. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide, which comprises:
providing; an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide, the ultrasonic transducer having a first capacitance in a parallel configuration with a series configuration of a resistance, an inductance, and a second capacitance, wherein the motional current flows through the series configuration; a measurement circuit connected in a parallel configuration with the ultrasonic transducer and comprising a third capacitance in a parallel configuration with the first capacitance; supplying current through a set of connection points of the parallel configuration with a variable power source to, thereby, create the motional current in the ultrasonic transducer, the variable power source being coupled to the third capacitance and the ultrasonic transducer; and regulating the motional current with a current controller by varying an output of the power source based upon a product of the current flowing through the third capacitance multiplied by a ratio between a value of the first capacitance and a value of the third capacitance subtracted from a total current flowing into the ultrasonic transducer, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads. - View Dependent Claims (2, 3, 4)
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5. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide, which comprises:
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providing; an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide, the ultrasonic transducer having a first capacitance in a parallel configuration with a series configuration of a resistance, an inductance and a second capacitance, whereby the motional current flows through the series configuration; and a third capacitance in a parallel configuration with the first capacitance; supplying current through a set of connection points of the parallel configuration with a variable power source coupled to the third capacitance and the ultrasonic transducer to, thereby, create the motional current in the ultrasonic transducer; and regulating the motional current with a current controller by varying an output of the power source based upon a product of the current flowing through the third capacitance multiplied by a ratio between a value of the first capacitance and a value of the third capacitance subtracted from a total current flowing into the ultrasonic transducer, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads. - View Dependent Claims (6, 7, 8, 9)
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10. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide, which comprises:
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providing; an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide; a removable battery; a disposable handle body with; a portion defining a battery-holding compartment shaped to removably receive the battery therein; and operable to removably couple the ultrasonic transducer to the ultrasonic waveguide, the ultrasonic transducer being separable from the handle body; the ultrasonic transducer having a first capacitance in a parallel configuration with a series configuration of a resistance, an inductance and a second capacitance, whereby the motional current flows through the series configuration; and a third capacitance in a parallel configuration with the first capacitance; supplying current through a set of connection points of the parallel configuration with a variable power source coupled to the third capacitance and the ultrasonic transducer to, thereby, create the motional current in the ultrasonic transducer; and regulating the motional current with a current controller by varying an output of the power source based upon a product of the current flowing through the third capacitance multiplied by a ratio between a value of the first capacitance and a value of the third capacitance subtracted from a total current flowing into the ultrasonic transducer, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads. - View Dependent Claims (11, 12)
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13. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide, which comprises:
providing; an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide; a clamping mechanism having a range of clamping force values and being operable to place material in physical contact with the cutting blade; a current controller communicatively coupled to the clamping mechanism; and a measurement circuit connected in a parallel configuration with the ultrasonic transducer; supplying current through a set of connection points of the parallel configuration with a variable power source to, thereby, create the motional current in the ultrasonic transducer; varying the motional current with the current controller based upon a given clamping value within the range of clamping values; and regulating the motional current with the current controller by varying an output of the power source, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads. - View Dependent Claims (14)
Specification