Method of maintaining constant movement of a cutting blade of an ultrasonic waveguide
First Claim
1. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide of a surgical instrument, which comprises:
- providing within a handle of the surgical instrument;
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 comprising a battery;
providing a clamping mechanism having a range of clamping force values and being operable to place material in physical contact with the cutting blade, wherein the clamping mechanism is communicatively coupled to a current controller;
supplying current 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;
regulating the motional current with the current controller by varying an output of the power source, thereby maintaining a resonant condition along the cutting blade in which there is a substantially constant rate of movement of the cutting blade across a variety of cutting loads; and
varying the motional current with the current controller based upon a given clamping value within the range of clamping values.
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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
10 Claims
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1. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide of a surgical instrument, which comprises:
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providing within a handle of the surgical instrument; 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 comprising a battery; providing a clamping mechanism having a range of clamping force values and being operable to place material in physical contact with the cutting blade, wherein the clamping mechanism is communicatively coupled to a current controller; supplying current 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; regulating the motional current with the current controller by varying an output of the power source, thereby maintaining a resonant condition along the cutting blade in which there is a substantially constant rate of movement of the cutting blade across a variety of cutting loads; and varying the motional current with the current controller based upon a given clamping value within the range of clamping values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of maintaining a constant movement of a cutting blade of an ultrasonic waveguide of a surgical instrument, which comprises:
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providing within a handle of the surgical instrument; an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide, wherein the ultrasonic transducer is comprised of 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; a measurement circuit connected in a parallel configuration with the ultrasonic transducer, wherein the measurement circuit is comprised of a third capacitance in a parallel configuration with the first capacitance; and a variable power source comprising a removable battery, the variable power source coupled to the third capacitance and the ultrasonic transducer; supplying current 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 regulating the motional current with a current controller by varying an output of the power source, wherein the varying of the output of the power source is 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 resonant condition along the cutting blade in which there is a substantially constant rate of movement of the cutting blade across a variety of cutting loads. - View Dependent Claims (9, 10)
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Specification