Methods for operating generator for digitally generating electrical signal waveforms and surgical instruments

1. A generator comprising:

a processor;

a memory in communication with the processor, the memory defining a first and second table; and

an electrical output port;

wherein the processor is configured to:

retrieve phase points defining a first digital electrical signal wave shape of a first electrical signal waveform from the first table defined in the memory;

retrieve phase points defining a second digital electrical signal wave shape of a second electrical signal waveform from the second table defined in the memory;

combine the phase points of the first digital electrical signal wave shape and the phase points of the second digital electrical signal wave shape to create a combined wave shape of a combined electrical signal waveform for performing a surgical procedure; and

deliver the combined wave shape of the combined electrical signal waveform for performing the surgical procedure to a surgical instrument via the electrical output port.

2. The generator of claim 1 , wherein the memory is a first memory, and the generator comprises a second memory; and

wherein the first table is defined by the first memory, and the second table is defined by a second memory.

3. The generator of claim 1 , wherein the first digital electrical signal wave shape is associated with a radio frequency (RF) electrical signal waveform and the second digital electrical signal wave shape is associated with an ultrasonic electrical signal waveform.

4. The generator of claim 1 , wherein the first digital electrical signal wave shape is associated with a first ultrasonic electrical signal waveform and the second digital electrical signal wave shape is associated with a second ultrasonic electrical signal waveform.

5. The generator of claim 1 , further comprising a direct digital synthesis circuit coupled to the processor and configured to create the first and second table.

6. The generator of claim 5 , wherein the processor is further configured to:

address the first table according to a frequency of the first electrical signal waveform; and

address the second table according to a frequency of the second electrical signal waveform.

7. The generator of claim 5 , wherein the processor is further configured to:

store information associated with the first digital electrical signal wave shape in the memory; and

store information associated with the second digital electrical signal wave shape.

8. The generator of claim 1 , wherein the processor is further configured to:

receive a feedback signal associated with tissue parameters; and

modify the first and second digital electrical wave shapes according to the feedback signal.

9. A generator comprising:

a processor;

a memory in communication with the processor, the memory defining a first and second table; and

an electrical output port;

wherein the processor is configured to:

retrieve information from the first table defined in the memory, wherein the information from the first table is associated with a first wave shape of a first electrical signal waveform for performing a surgical procedure;

retrieve information from the second table defined in the memory, wherein the information from the second table is associated with a second wave shape of a second electrical signal waveform for performing a surgical procedure;

deliver the first and second electrical signal waveforms for performing a surgical procedure to a surgical instrument via the electrical output port; wherein delivering the first and second electrical signal waveforms comprises at least one of: switching between the first and second electrical signal waveforms or synchronizing the first and second electrical signal waveforms;

receive a feedback signal associated with tissue parameters; and

based on the feedback signal, and while delivering the first and second electrical signal waveforms, determine whether to:

switch from a first phase point of the first electrical signal waveform to a second phase point of the second electrical signal waveform and convert the second phase point to a first analog signal; or

synchronize delivery of the first and the second phase points and convert the synchronized first and the second phase points to a second analog signal.

10. The generator of claim 9 , wherein the processor is further configured to maximize power delivered to the surgical instrument.

11. The generator of claim 9 , wherein the first electrical signal waveform represents a radio frequency (RF) waveform and the second electrical signal waveform represents an ultrasonic signal waveform.

12. The generator of claim 9 , wherein the first wave shape is associated with a first ultrasonic electrical signal waveform and the second wave shape is associated with a second ultrasonic electrical signal waveform.

13. A generator comprising:

a processor;

a memory in communication with the processor, the memory defining a first and second table; and

an electrical output port;

wherein the processor is configured to:

retrieve information from the first table defined in the memory, wherein the information from the first table is associated with a first wave shape of a first electrical signal waveform for performing a surgical procedure;

retrieve information from the second table defined in the memory, wherein the information from the second table is associated with a second wave shape of a second electrical signal waveform for performing a surgical procedure; and

combine the first and second wave shapes to create a combined wave shape of a combined electrical signal waveform for performing a surgical procedure;

deliver the combined wave shape of the combined electrical signal waveform for performing the surgical procedure to a surgical instrument via the electrical output port; and

modify the combined wave shape of the combined electrical signal waveform to form a modified electrical signal waveform, the modified electrical signal waveform comprising a peak amplitude that does not exceed a predetermined amplitude and is less than a peak amplitude of the combined electrical signal waveform.

14. The generator of claim 13 , wherein the first wave shape is associated with a first radio frequency (RF) electrical signal waveform and the second wave shape is associated with a second RF electrical signal waveform.

15. The generator of claim 13 , wherein the first wave shape is associated with a first ultrasonic electrical signal waveform and the second wave shape is associated with a second ultrasonic electrical signal waveform.

16. The generator of claim 13 , wherein the first wave shape is associated with a radio frequency (RF) electrical signal waveform and the second wave shape is associated with an ultrasonic electrical signal waveform.

17. The generator of claim 13 , wherein the processor is further configured to determine the peak amplitude of the combined electrical signal waveform while delivering the combined electrical signal waveform to the surgical instrument.

18. The generator of claim 13 , wherein the processor is further configured to reduce an amplitude of the combined electrical signal waveform prior to an occurrence of the peak amplitude of the combined electrical signal waveform.

19. The generator of claim 13 , wherein the processor is further configured to:

determine the peak amplitude of the combined electrical signal waveform; and

modify the combined electrical signal waveform based on the determined peak amplitude of the combined electrical signal waveform.