Implantable stimulator having an efficient output generator

Details Implantable stimulator having an efficient output generator Implantable stimulator having an efficient output generator

1997-08-21

1999-09-07

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

607 72, A61N 1362

Patent

active

059480041

ABSTRACT:
An output pulse generator is provided which is particularly suitable for implantable medical simulators, such as cardiac pacemakers, where there is a high premium on efficient energy transfer from the battery source to the output load. A plurality of relatively small size output capacitor are utilized in combination with a switching circuit for alternately charging respective capacitors and then discharging them through the load in such a manner that there is always one capacitor providing a substantially constant output voltage while at least one other capacitors is being recharged. Different combinations of switching networks are used to provide programmable output voltage levels. The use of relatively small capacitors, e.g., in the range of 0.1-0.5 F, along with a relatively high drive frequency, e.g., 32 kHz, enables substantially continuous transfer of energy from the battery to the capacitors only during the time of pulse output, and high efficiency generation of a stimulus pulse with a substantially constant voltage level throughout the pulse duration. Variation of the drive frequency is done in order to adjust the generated pulses to the output load.

REFERENCES:
patent: 4031899 (1977-06-01), Renirie
patent: 4768512 (1988-09-01), Imran

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