Neuromodulation using modulated pulse train

1. A neuromodulation system for modulating neural tissue by delivering a modulated electrical pulse train to the neural tissue, the neuromodulation system comprising:

neuromodulation output circuitry configured to output an electrical pulse train;

pulse train modulation circuitry configured to modulate the electrical pulse train output by the neuromodulation output circuitry with a modulation signal that has a defined shape selected from a group of preprogrammed shapes to provide the modulated electrical pulse train to modulate the neural tissue; and

a user interface configured to receive a shape selection from the user, wherein the shape selection is a selected one of the group of preprogrammed shapes for use as the defined shape of the modulation signal.

2. The neuromodulation system of claim 1 , wherein the electrical pulse train has an amplitude, and the pulse train modulation circuitry is configured to modulate the amplitude of the electrical pulse train with the defined shape of the modulation parameter.

3. The neuromodulation system of claim 1 , wherein the electrical pulse train has a pulse rate, and the pulse train modulation circuitry is configured to modulate the pulse rate of the electrical pulse train with the defined shape of the modulation parameter.

4. The neuromodulation system of claim 1 , wherein the electrical pulse train has an amplitude, a pulse duration, and the pulse train modulation circuitry is configured to modulate the pulse duration of the electrical pulse train with the defined shape of the modulation parameter.

5. The neuromodulation system of claim 1 , wherein the electrical pulse train has an amplitude, a pulse rate and a pulse duration, and the pulse train modulation circuitry is configured to modulate more than one of the amplitude, the pulse rate and the pulse duration of the electrical pulse train with the defined shape of the modulation parameter.

6. The neuromodulation system of claim 1 , wherein the group of preprogrammed shapes include at least two of a sinusoidal wave, a triangular wave, and a ramp wave.

7. The neuromodulation system of claim 1 , wherein:

the electrical pulse train has a plurality of parameters;

the user input is configured to receive at least one parameter selection from the user wherein the at least one parameter is selected from the plurality of parameters, the at least one parameter selection to define at least one parameter of the electrical pulse train to be modulated with the modulation signal that has the defined shape.

8. The neuromodulation system of claim 1 , wherein the system is a spinal cord modulation system.

9. The neuromodulation system of claim 1 , wherein the system is a deep brain stimulation system.

10. The neuromodulation system of claim 1 , wherein the pulse train modulation circuitry is analog modulation circuitry.

11. The neuromodulation system of claim 1 , wherein the pulse train modulation circuitry is digital modulation circuitry.

12. A neuromodulation system for modulating neural tissue by delivering a modulated electrical pulse train to the neural tissue, the neuromodulation system comprising:

a plurality of electrical terminals configured for being respectively coupled to a plurality of electrodes;

neuromodulation output circuitry configured for outputting an electrical pulse train to the plurality of electrical terminals;

a user interface configured to receive a shape selection from a group of two or more shape selections for a modulation signal that may be selected to define a shape of the modulation signal; and

pulse train modulation circuitry configured to modulate a pulse rate of the electrical pulse train outputted from the neuromodulation output circuitry in accordance with the defined shape of the modulation signal to provide the modulated electrical pulse train.

13. The neuromodulation system of claim 12 , wherein the user interface includes a control that allows a user to specify at least one limit of the defined shape of the modulation signal.

14. The neuromodulation system of claim 12 , wherein the user interface includes a control that allows a user to specify at least one limit of a period of the modulation signal.

15. The neuromodulation system of claim 12 , the electrical pulse train has a plurality of parameters, the user interface is configured to receive at least one parameter selection from the user, wherein the least one parameter is selected from the plurality of parameters, the at least one parameter selection to define at least one parameter of the electrical pulse train to be modulated with the modulation signal that has the defined shape.

16. A method, comprising:

receiving, via a user interface, a user selection of a defined shape selected from a group of preprogrammed shapes; and

modulating neural tissue by delivering a modulated electrical pulse train to the neural tissue, wherein delivering the modulated electrical pulse train to the neural tissue includes delivering an electrical pulse train from neuromodulation output circuitry, and modulating the electrical pulse train delivered from the neuromodulation output circuitry using the user selection of the defined shape to provide the modulated electrical pulse train.

17. The method of claim 16 , further comprising receiving, via a control on the user interface, at least one limit for modulating the electrical pulse train.

18. The method of claim 17 , wherein the at least one limit includes at least one limit of the defined shape.

19. The method of claim 17 , wherein the at least one limit includes at least one limit of a period for modulating the electrical pulse train using the user selection of the defined shape.

20. The method of claim 16 , wherein modulating the electrical pulse train using the user selection of the defined shape includes modulating at least one of an amplitude, a pulse rate, or a pulse duration of the electrical pulse train using the user selection of the defined shape.