Further technical improvements for r-IPGs are needed. Subgroup analysis only showed a significant impact on overall convenience for different models of stimulators ( p < 0.05). Overall, SCS patients feel confident handling a r-IPG at high rates of convenience and acceptable effort despite high rates of usage-related complications. 28.9% of patients experienced unintended interruptions of stimulation. 37.5% of patients reported failed recharges. 92% of the patients felt confident recharging the neurostimulator. The charge burden was 112.7 ± 139 min/week. The overall convenience of recharging was evaluated as “easy” (4 points). Patient age was 57.2 ± 12.6 (mean ± standard deviation) years with the r-IPG being implanted for 52.1 ± 32.6 months. Endpoints were analyzed for several subgroups. Data sets n = 40 (42% return rate) were eligible for analysis. Secondary endpoints were charge burden (min/week), rates of user confidence and complications (failed recharges, interruptions of therapy). Primary endpoint was the overall convenience of the charging process on an ordinal scale from “very hard” (1 point) to “very easy” (5 points). The aim of the study (DRKS00021281 Apr 7 th, 2020) was to assess the convenience, safety, and acceptance of r-IPGs and their effect on patient lives under long-term therapy. Standardized questionnaires were sent to all chronic pain patients with a r-IPG at the time of trial. Rechargeable implantable pulse generators (r-IPGs) have been available for spinal cord stimulation (SCS) claiming to offer a longer service life but demanding continuous monitoring and regular recharging by the patients.
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