Cordless hand-held ultrasonic cautery cutting device
First Claim
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1. An ultrasonic surgical assembly, comprising:
- a surgical instrument handle, the handle having within it;
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 comprising a battery and operable to supply current through a set of connection points to the parallel configuration and thereby create the motional current in the ultrasonic transducer;
a current controller operable to regulate the motional current by varying an output of the variable 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
a clamping mechanism having a range of clamping force values and being operable to place material in physical contact with the cutting blade, the current controller communicatively coupled to the clamping mechanism and operable to vary the motional current based upon a given clamping value within the range of clamping values.
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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.
952 Citations
11 Claims
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1. An ultrasonic surgical assembly, comprising:
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a surgical instrument handle, the handle having within it; 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 comprising a battery and operable to supply current through a set of connection points to the parallel configuration and thereby create the motional current in the ultrasonic transducer; a current controller operable to regulate the motional current by varying an output of the variable 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 a clamping mechanism having a range of clamping force values and being operable to place material in physical contact with the cutting blade, the current controller communicatively coupled to the clamping mechanism and operable to vary the motional current based upon a given clamping value within the range of clamping values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An ultrasonic surgical assembly, comprising:
a surgical instrument handle, the handle having within it; an ultrasonic transducer operable to convert a received motional current into a movement of a cutting blade of an ultrasonic waveguide, the ultrasonic transducer 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, the measurement circuit comprised of a third capacitance in a parallel configuration with the first capacitance; a variable power source comprising a removable battery and operable to supply current through a set of connection points to the parallel configuration and thereby create the motional current in the ultrasonic transducer, wherein the variable power source is 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 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 (10, 11)
Specification