In-the-jaw classifier based on a model
An ultrasonic device may include an electromechanical ultrasonic system defined by a predetermined resonant frequency, in which the system may include an ultrasonic transducer coupled to an ultrasonic blade. A method of estimating a state of an end effector of the ultrasonic device may include applying a drive signal defined by a magnitude and a frequency to the ultrasonic transducer, sweeping the frequency of the drive signal from below a first resonance to above the first resonance of the electromagnetic ultrasonic system, measuring and recording, impedance/admittance circle variables R e , G e , X e , and B e , comparing, the measured impedance/admittance circle variables R e , G e , X e , and B e to reference impedance/admittance circle variables R ref , G ref , X ref , and B ref , and determining, a state or condition of the end effector based on the result of the comparison. An electromechanical ultrasonic system may include a control circuit to effect the method.
1. An ultrasonic surgical instrument comprising:
an ultrasonic electromechanical system comprising an ultrasonic transducer coupled to an ultrasonic blade via an ultrasonic waveguide;
a jaw clamp; and
a generator configured to supply power to the ultrasonic transducer, wherein the generator comprises a control circuit configured to:
cause a drive circuit to apply a drive signal to the ultrasonic transducer, wherein the drive signal is a periodic signal defined by a magnitude and a frequency;
sweep the frequency of the drive signal from below a first resonance to above the first resonance of the ultrasonic electromechanical system;
measure and record impedance/admittance circle variables R e , G e , X e , and B e ;
compare the measured impedance/admittance circle variables R e , G e , X e , and B e to reference impedance/admittance circle variables R ref , G ref , X ref , and B ref ; and
determine a state or condition of an end effector based on the result of the comparison.
2. The ultrasonic surgical instrument of claim 1 , wherein the control circuit is further configured to compare the measured impedance/admittance circle variables R e , G e , X e , and B e to reference impedance/admittance circle variables R ref , G ref , X ref , and B ref stored in a database of the ultrasonic surgical instrument.
3. The ultrasonic surgical instrument of claim 1 , wherein the control circuit is further configured to compare the measured impedance/admittance circle variables R e , G e , X e , and B e to reference impedance/admittance circle variables R ref , G ref , X ref , and B ref corresponding to an open and unloaded state of the jaw clamp of the ultrasonic surgical instrument.
4. The ultrasonic surgical instrument of claim 1 , wherein the reference impedance/admittance circle variables R ref , G ref , X ref , and B ref correspond to a tip bite of the jaw clamp of the ultrasonic surgical instrument.
5. The ultrasonic surgical instrument of claim 4 , wherein the reference impedance/admittance circle variables R ref , G ref , X ref , and B ref correspond to a tip bite of the jaw clamp of the ultrasonic surgical instrument on a piece of moist chamois.
6. The ultrasonic surgical instrument of claim 1 , wherein the reference impedance/admittance circle variables R ref , G ref , X ref , and B ref correspond to a full bite of the jaw clamp of the ultrasonic surgical instrument.
7. The ultrasonic surgical instrument of claim 6 , wherein the reference impedance/admittance circle variables R ref , G ref , X ref , and B ref correspond to a full bite of the jaw clamp of the ultrasonic surgical instrument on a piece of dry chamois.
8. The ultrasonic surgical instrument of claim 6 , wherein the reference impedance/admittance circle variables R ref , G ref , X ref , and B ref correspond to a full bite of the jaw clamp of the ultrasonic surgical instrument on a piece of moist chamois.
9. The ultrasonic surgical instrument of claim 1 , wherein the control circuit is further configured to compare the measured impedance/admittance circle variables R e , G e , X e , and B e to reference impedance/admittance circle variables R ref , G ref , X ref , and B ref corresponding to a staple disposed in the jaw clamp of the ultrasonic surgical instrument.
10. The ultrasonic surgical instrument of claim 1 , wherein the control circuit is further configured to sweep the frequency of the drive signal from below the first resonance to above a second resonance of the ultrasonic electromechanical system.
11. A generator for an ultrasonic surgical instrument, the generator comprising:
a control circuit configured to:
cause a drive circuit to apply a drive signal to an ultrasonic transducer, wherein the drive signal is a periodic signal defined by a magnitude and a frequency;
sweep the frequency of the drive signal from below a first resonance to above the first resonance of an ultrasonic electromechanical system;
measure and record impedance/admittance circle variables R e , G e , X e , and B e ;
compare the measured impedance/admittance circle variables R e , G e , X e , and B e to reference impedance/admittance circle variables R ref , G ref , X ref , and B ref ; and
determine a state or condition of an end effector based on the result of the comparison.