Cordless hand-held ultrasonic cautery cutting device
First Claim
Patent Images
1. An ultrasonic surgical assembly, comprising:
- 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;
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, the variable power source being coupled to the third capacitance and the ultrasonic transducer; and
a current controller operable to regulate the motional current by varying an output of the variable 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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Abstract
An ultrasonic surgical assembly includes 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, 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, and a current controller operable to regulate the motional current by varying an output of the variable power source, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads.
1210 Citations
14 Claims
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1. An ultrasonic surgical assembly, comprising:
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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; 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, the variable power source being coupled to the third capacitance and the ultrasonic transducer; and a current controller operable to regulate the motional current by varying an output of the variable 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. An ultrasonic surgical assembly, comprising:
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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; a third capacitance in a parallel configuration with the first capacitance; a variable power source coupled to the third capacitance and the ultrasonic transducer; and a current controller operable to regulate the motional current by varying an output of the variable 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. An ultrasonic surgical assembly, comprising:
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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 having; 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; a third capacitance in a parallel configuration with the first capacitance; a variable power source coupled to the third capacitance and the ultrasonic transducer; and a current controller operable to regulate the motional current by varying an output of the variable 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. An ultrasonic surgical assembly, comprising:
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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 operable to vary the motional current based upon a given clamping force value within the range of clamping force values; a measurement circuit connected in a parallel configuration with the ultrasonic transducer; 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; and the current being controller operable to regulate the motional current by varying an output of the variable power source, thereby maintaining a substantially constant rate of movement of the cutting blade across a variety of cutting loads. - View Dependent Claims (14)
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Specification