Circuits for supplying isolated direct current (DC) voltage to surgical instruments
Provided is an apparatus, system, and method for managing radio frequency (RF) and ultrasonic signals output by a generator that includes a surgical instrument comprising an RF energy output and an ultrasonic energy output and a circuit configured to receive a combined RF and ultrasonic signal from the generator. The circuit may be configured to isolate a direct current (DC) voltage from the combined RF and ultrasonic signal. The DC voltage may then be used to power various electrical components of the surgical instrument while still providing RF energy and ultrasonic energy for surgical application.
1. A system for managing radio frequency (RF) and ultrasonic signals output by a generator, comprising:
a surgical instrument comprising a direct current (DC) motor load, an ultrasonic energy output, and a circuit;
wherein the circuit is configured to:
receive a combined RF and ultrasonic signal from the generator, the combined signal comprising RF signal content and ultrasonic signal content; the RF signal content comprising an RF signal frequency component and an RF signal amplitude component; the ultrasonic signal content comprising an ultrasonic signal frequency component, and an ultrasonic signal amplitude component;
generate an ultrasonic filtered signal by filtering the combined signal to extract the ultrasonic signal content from the combined signal;
generate DC voltage by filtering the combined signal to extract the RF signal content from the combined signal;
provide the DC voltage to the DC motor load; and
provide the ultrasonic filtered signal to the ultrasonic energy output.
2. The system of claim 1 , wherein the surgical instrument further comprises at least one electrical component, and the DC motor load is configured to power the at least one electrical component using the generated DC voltage.
3. The system of claim 2 , wherein the at least one electrical component comprises an end effector.
4. The system of claim 2 , wherein the at least one electrical component comprises one or more light emitting diodes (LEDs).
5. The system of claim 2 , wherein the at least one electrical component comprises one or more sensors configured to detect a physiological condition of tissue at a surgical site.
6. The system of claim 1 , wherein the circuit comprises a high frequency band-stop filter.
7. The system of claim 6 , wherein generating the ultrasonic filtered signal further comprises extracting the ultrasonic signal frequency component through the high frequency band-stop filter.
8. The system of claim 6 , wherein generating the DC voltage further comprises extracting the RF signal frequency component through the high frequency band-stop filter.
9. The system of claim 1 , wherein the circuit comprises a rectifier configured to produce the DC voltage.
10. The system of claim 1 , wherein the surgical instrument is configured to apply a therapy of RF energy through the DC motor load and ultrasonic energy through the ultrasonic energy output simultaneously.
11. The system of claim 1 , wherein the surgical instrument is configured to switch between applying RF energy through the DC motor load and applying ultrasonic energy through the ultrasonic energy output.
12. The system of claim 11 , wherein the circuit further comprises:
an application specific integrated circuit (ASIC);
a memory coupled to the ASIC;
a switch array coupled to the ASIC; and
a rectifier coupled to the ASIC;
wherein the ASIC is configured to control switching between the DC motor load and the ultrasonic energy output through the switch array.
13. A medical instrument comprising:
a direct current (DC) motor load;
an ultrasonic energy output, and
a circuit;
wherein the circuit is configured to:
receive a combined RF and ultrasonic signal from a generator electrically coupled to the medical instrument, the combined signal comprising RF signal content and ultrasonic signal content; the RF signal content comprising an RF signal frequency component and an RF signal amplitude component; the ultrasonic signal content comprising an ultrasonic signal frequency component, and an ultrasonic signal amplitude component;
generate an ultrasonic filtered signal by filtering the combined signal to extract the ultrasonic signal content from the combined signal;
generate DC voltage by filtering the combined signal to extract the RF signal content from the combined signal;
provide the DC voltage to the DC motor load; and
provide the ultrasonic filtered signal to the ultrasonic energy output.
14. The medical instrument of claim 13 , further comprising an end effector, and wherein the DC motor load is configured to power the end effector using the generated DC voltage.
15. The medical instrument of claim 13 , wherein the circuit comprises a high frequency band-stop filter.
16. The medical instrument of claim 15 , wherein generating the ultrasonic filtered signal further comprises extracting the ultrasonic signal frequency component through the high frequency band-stop filter.
17. The medical instrument of claim 15 , wherein generating the DC voltage further comprises extracting the RF signal frequency component through the high frequency band-stop filter.
18. The medical instrument of claim 13 , wherein the medical instrument is configured to apply a therapy of RF energy through the DC motor load and ultrasonic energy through the ultrasonic energy output simultaneously.
19. The medical instrument of claim 13 , wherein the circuit is further configured to switch between applying RF energy through the DC motor load and applying ultrasonic energy through the ultrasonic energy output.
20. A medical instrument comprising:
a direct current (DC) motor load;
an ultrasonic energy output; and
a circuit, the circuit comprising:
an application specific integrated circuit (ASIC);
a memory coupled to the ASIC;
a switch array coupled to the ASIC; and
a rectifier coupled to the ASIC;
wherein the circuit is configured to:
receive a combined RF and ultrasonic signal from a generator electrically coupled to the medical instrument, the combined signal comprising RF signal content and ultrasonic signal content; the RF signal content comprising an RF signal frequency component and an RF signal amplitude component; the ultrasonic signal content comprising an ultrasonic signal frequency component, and an ultrasonic signal amplitude component;
generate an ultrasonic filtered signal by filtering the combined signal to extract the ultrasonic signal content from the combined signal;
generate DC voltage by filtering the combined signal to extract the RF signal content from the combined signal;
provide the DC voltage to the DC motor load; and
provide the ultrasonic filtered signal to the ultrasonic energy output;
wherein the ASIC is configured to control switching between applying RF energy through the DC motor load and applying ultrasonic energy through the ultrasonic energy output.