As a core device for the clinical diagnosis of cardiovascular diseases, the electrocardiograph is valued for its ability to accurately capture microvolt-level (only 10–100μV) electrocardiographic signals in the human body and generate complete, clear static electrocardiograms. These outputs provide critical evidence for physicians to diagnose arrhythmia, myocardial ischemia, myocardial infarction and other cardiovascular conditions. However, the complex electromagnetic environment in hospitals—including power frequency interference, radiation from surrounding high-frequency equipment, and power grid clutter—can easily infiltrate these weak ECG signals. This infiltration causes issues such as baseline drift, clutter superposition, and blurred characteristic waves in the waveforms, directly compromising diagnostic accuracy and even leading to misdiagnosis or missed diagnosis. With core advantages of high-efficiency filtering and reliable insulation, LCA® feedthrough capacitors have become the key protective component for safeguarding the signal acquisition precision of electrocardiographs.

        The power supply module is the primary entry point for interference. High-frequency clutter ranging from 100kHz to 1GHz introduced by the power grid, along with radiation interference from surrounding medical devices, can easily invade the device through power lines and cause power supply noise. LCA® feedthrough capacitors are connected in series at the mains input terminal, forming a dedicated high-efficiency filter network with common-mode inductors. This setup can accurately filter out broadband clutter with an insertion loss ≥25dB, delivering clean power with a ripple ≤5mV to the device’s core circuits. It blocks interference transmission from the source and prevents ECG waveform distortion caused by power supply noise.

        At the connection port between electrode leads and the host machine, external electromagnetic crosstalk and interference signals from the device’s internal circuits can easily couple into the ECG signal link via the leads. The LCA® feedthrough capacitors deployed here can targetedly suppress electromagnetic crosstalk while isolating interference from internal circuits, ensuring that microvolt-level ECG signals are transmitted to the signal processing unit in a pure state. While guaranteeing signal acquisition precision, these capacitors also minimize the risk of electric shock for both medical staff and patients, providing comprehensive, safe and reliable technical support for accurate clinical ECG diagnosis.