As a core device for clinical intensive care and postoperative observation, the ECG monitor is valued for its ability to accurately capture weak bioelectrical ECG signals (ranging from only a few microvolts to tens of millivolts), providing reliable evidence for doctors to assess cardiac rhythms, myocardial conditions and other vital parameters. However, amid the complex electromagnetic environment of hospitals, monitors are highly vulnerable to multiple interferences: high-frequency noise from internal circuits, 100kHz–1GHz clutter from external power grids, and electromagnetic radiation emitted by surrounding medical devices such as high-frequency electrosurgical units and ventilators. These interferences can cause ECG waveform distortion and baseline drift, or even mask critical pathological signals like premature beats and atrial fibrillation, posing serious risks to accurate diagnosis.
To address this core pain point, LCA® feedthrough capacitors leverage their advantages of low equivalent series inductance (ESL ≤ 0.1nH) and high self-resonant frequency (SRF ≥ 5GHz) to build a dual anti-interference system of “power purification + signal protection”, serving as a key component to ensure the precise operation of monitors. At the power input terminal, LCA® feedthrough capacitors form a high-efficiency composite filter network with common-mode inductors, which can accurately bypass broadband high-frequency clutter from the power grid with an insertion loss ≥ 25dB, ensuring a pure and stable power supply chain. At the signal acquisition port, custom-designed small-capacitance feedthrough capacitors (100pF~1nF) can effectively suppress electromagnetic interference coupled via lead wires, while preserving the original characteristics of weak ECG signals with ultra-low signal attenuation (≤ 0.5%).
In line with the stringent requirements of medical scenarios, the selected LCA® feedthrough capacitors feature an insulation resistance ≥ 10¹²Ω and leakage current ≤ 0.1μA, minimizing the risk of electric shock for both medical staff and patients. Moreover, the scientific installation design of “all-metal shell + 360° surface contact grounding” achieves a grounding impedance ≤ 100mΩ, ensuring rapid discharge of interference signals. After application, the signal-to-noise ratio (SNR) of ECG monitors is improved by over 40%, with stable waveform baselines and significantly enhanced recognition rates of key pathological signals. This not only provides strong support for doctors’ accurate diagnosis, but also greatly reduces the risks of misdiagnosis and missed diagnosis caused by signal distortion.
