Key result
Early semi-implanted pacemakers reduce size but yield to fully implantable systems due to external hardware risks.
Why the study?
To summarize key clinical and engineering developments of radiofrequency-powered and inductively coupled semi-implanted pacing systems from their first report in 1959.
This historical review of early semi-implanted pacemakers highlights the foundational principles of transcutaneous energy transfer that continue to inform modern externally powered implantable therapies.
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Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“I'm happy to share that a paper I coauthored with Daniel Villamil, “The Forgotten History of Semi‐Implanted Radiofrequency‐ and Inductive‐Powered Cardiac Pacing Systems,” has been published online in Pacing and Clinical Electrophysiology (PACE). The paper explores an often overlooked chapter in pacemaker history. Although continuously externally powered cardiac pacing was replaced by fully implantable pulse generators, the same basic strategy remains useful in modern therapies that place a small batteryless stimulator near the treatment site while keeping the power source and part of the control system outside the body.”
Historical review of semi-implanted pacing extends transcutaneous energy principles to modern wireless systems; leaves optimization and validation open.
Radiofrequency-powered and inductively coupled semi-implanted pacemakers offered an early alternative to battery-powered implantable pulse generators by transferring energy across intact skin to a small, implanted receiver. This review summarizes key clinical and engineering developments from the first reported radiofrequency-powered pacing in 1959 through subsequent refinements and commercial implementations, including the Cutler-Hammer and Cordis Transicor RF systems, and it places these efforts alongside the Abrams/Lightwood inductively coupled device commercialized by Joseph Lucas Ltd. These systems reduced implanted size and allowed external servicing, but they imposed major human factors and safety constraints because pacing depended on correct placement and continuous operation of external hardware. As implantable-grade batteries, hermetic packaging, and lead technology improved, fully implantable pacemakers became clinically dominant. The historical experience nonetheless established durable principles of transcutaneous energy transfer that continue to inform modern externally powered implantable therapies where brief interruptions are clinically tolerable.
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Prutchi et al. (2026) conducted a review in Cardiac pacing. Semi-implanted radiofrequency- and inductive-powered cardiac pacing systems vs. Fully implantable battery-powered pacemakers was evaluated. Early semi-implanted radiofrequency- and inductive-powered pacemakers reduced implanted size but were superseded by fully implantable systems due to safety constraints from external hardware reliance.
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