Therapy implemented using different sub-perception neuromodulation types

A neuromodulation system for modulating a volume of spinal neural tissue, comprising:

• electrodes configured to be implanted adjacent to a spinal cord of a patient;
• a waveform generator configured to be electrically connected to the electrodes and to provide an electrical waveform through at least some of the electrodes to provide a spinal cord neuromodulation therapy;
• and
• a controller configured control the waveform generator to deliver the spinal cord neuromodulation therapy by simultaneously providing both a first sub-perception neuromodulation and a second sub-perception neuromodulation, wherein the first and second sub-perception neuromodulations both comprise a pattern of a plurality of pulses that overlap in time,
• wherein the controller is further configured to terminate stimulation for the first sub-perception neuromodulation before the second sub-perception neuromodulation such a plurality of pulses of the second sub-perception neuromodulation continues to issue,
• wherein the first neuromodulation has a wash-in transition period less than a first time duration, and the second sub-perception neuromodulation has a wash-in transition period more than a second time duration, the second time duration being longer than the first time duration.

A system comprising a non-transitory machine-readable medium including instructions, which when executed by a machine, cause the machine to configure a program for a neurostimulator that is capable of providing a spinal cord neurostimulation therapy, the instructions causing the machine to configure the program to cause the neurostimulator to:

• provide the spinal cord neuromodulation therapy by simultaneously delivering both a first sub-perception neuromodulation and a second sub-perception neuromodulation to a spinal cord of a patient using one or more electrodes implanted adjacent to the spinal cord, wherein the first and second sub-perception neuromodulations both comprise a pattern of a plurality of pulses that overlap in time;
• and
• terminate stimulation for the first sub-perception neuromodulation before the second sub-perception neuromodulation such that a plurality of pulses of the second sub-perception neuromodulation continues to issue,
• wherein the first neuromodulation has a wash-in transition period less than a first time duration, and the second sub-perception neuromodulation has a wash-in transition period more than a second time duration, the second time duration being longer than the first time duration.