Therapy delivery method and system for implantable medical devices

An implantable medical system comprising:

• an implantable medical lead having an electrode;
• an implantable medical device coupled to the implantable medical lead, the implantable medical device including:
• a therapy delivery circuit having:
• a plurality of capacitors;
• means for stacking the plurality of capacitors, wherein the means for stacking the plurality of capacitors dynamically configures the coupling between the capacitors into a first stacked configuration during a first interval and into a second stacked configuration during a second interval;
• a power source;
• a charge circuit coupled between the power source and the therapy delivery circuit, wherein the charge circuit includes:
• a transformer having a primary winding and a secondary winding, wherein the primary winding is coupled to the power source, and
• a first diode coupled directly between a first of the plurality of output capacitors and the secondary winding,
• a second diode coupled directly between the first diode and a second of the plurality of capacitors,
• a third diode coupled directly between the second diode and a third of the plurality of capacitors, wherein
• the first, second, and third diodes are configured to regulate a charging polarity for the plurality of output capacitors, and wherein the coupling configuration between the single secondary winding and the plurality of capacitors triggers simultaneously transfer of charge from the power source to the plurality of capacitors;
• and
• a control module for controlling delivery of therapy from the therapy delivery circuit to the electrode.

An implantable medical system comprising:

• an implantable medical lead having an electrode;
• an implantable medical device coupled to the implantable medical lead, the implantable medical device including:
• a power source;
• a therapy delivery circuit having:
• a plurality of capacitors;
• means for stacking the plurality of capacitors, wherein the means for stacking the plurality of capacitors dynamically configures the coupling between the capacitors into a first stacked configuration during a first interval and into a second stacked configuration during a second interval;
• a charge circuit coupled between the power source and the therapy delivery circuit, wherein the charge circuit includes:
• a transformer having a primary winding and a secondary winding, wherein the primary winding is coupled to the power source and
• a first diode coupled directly between a first of the plurality of output capacitors and the secondary winding, a second diode coupled directly between the first diode and a second of the plurality of capacitors, a third diode coupled directly between the second diode and a third of the plurality of capacitors,
• wherein the first, second and third diodes are configured to regulate a charging polarity for the plurality of output capacitors, and wherein the coupling configuration between the single secondary winding and the plurality of capacitors triggers simultaneously transfer of charge from the power source to the plurality of capacitors;
• and
• a control module for controlling delivery of therapy from the therapy delivery circuit to the electrode, wherein the control module controls the discharge of energy from the plurality of capacitors to generate a stimulation waveform having a stepped leading-edge.

An implantable medical device, comprising:

• a power source;
• a plurality of output capacitors;
• a charge circuit coupled to the power source and to the plurality of output capacitors, including:
• a transformer consisting of a primary winding coupled to the power source and a secondary winding coupled to the plurality of output capacitors, wherein the transformer is configured for charging each of the plurality of output capacitors;
• a first diode coupled directly between the plurality of output capacitors and the secondary winding, a second diode coupled directly between the first diode and a second of the plurality of capacitors, and a third diode coupled directly between the second diode and a third of the plurality of capacitors,
• wherein the first, second and third diodes are configured to regulate a charging polarity for the plurality of output capacitors, and wherein the coupling configuration between the single secondary winding and the plurality of capacitors triggers simultaneously transfer of charge from the power source to the plurality of capacitors;
• a coupling means for coupling the plurality of output capacitors in a parallel configuration during the charging of the capacitors.