Implantable devices using rechargeable zero-volt technology lithium-ion batteries
US7295878B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 22, 2004 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Aug 27, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3605
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An implantable medical device, such as an implantable pulse generator (IPG) used with a spinal cord stimulation (SCS) system, includes a rechargeable lithium-ion battery having an anode electrode with a substrate made substantially from titanium. Such battery construction allows the rechargeable battery to be discharged down to zero volts without damage to the battery. The implantable medical device includes battery charging and protection circuitry that controls the charging of the battery so as to assure its reliable and safe operation. A multi-rate charge algorithm is employed that minimizes charging time while ensuring the battery cell is safely charged. Slow charging occurs at lower battery voltages (e.g., battery voltage below about 2.5 V), and fast charging occurs when the battery voltage has reached a safe level (e.g., above about 2.5 V). When potentially less-than-safe very low voltages are encountered (e.g., less than 2.5 V), then very slow (trickle) charging occurs to bring the battery voltage back up to the safer voltage levels where more rapid charging can safely occur. The battery charging and protection circuitry also continuously monitors the battery voltage and cur…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.