Today's medical devices are filled with increasingly sophisticated electronic devices to complement the range of functions that devices monitor, display, assist and warn patients. The latest generation of medical equipment and electronic equipment is smaller and more compact, but it can be plugged into more monitoring instruments. The biggest design difficulty that comes with it is how to effectively reduce the interference of external electromagnetic waves on the equipment. â€
The good news is that there are now solutions to the problem of (EMI) and cable noise control in military and satellite systems in tight spaces. The cable and connector experience of military and satellite systems has unexpectedly solved the problem of electromagnetic interference control for the medical device industry. Pave the way. The industry's proven experience with cables and connectors helps to make safer cables available in the medical industry.
The experience gained from cables designed for military and satellite systems is important because many newer ICU instruments are based on digital signals operating at gigahertz speeds, while being close to other electronic instruments.
Typically, this will help determine if the cable routed within the instrument rack is disturbed by external electromagnetic waves (receivers of unwanted EMI), or if the cable may be a EMI noise transmitter to propagate to other equipment. In either case, EMI noise can cause serious problems in the performance of the entire medical device or reduce the accuracy of the instrument to varying degrees.
Medical cables and designers have a variety of solutions to control EMI noise in medical instruments. The following are some of the current mainstream solutions to EMI noise:
Selective filter circuit EMI can be solved by finding the frequency of the interference noise and adding a selective filtering circuit to the instrument board or by adding a filter to the connector on the cable harness. Film capacitors and resistors can eliminate unwanted signal noise by grounding near the noise source. However, cables and connectors must be made small enough to limit the performance of the coaxial filter circuit if it is too large, which will have an impact on the effectiveness of electromagnetic interference.
2. Overall shieldingWhen it comes to isolating electromagnetic waves from external complex environments, the use of braided shielding on cables has been one of the mainstream methods. It is generally accepted in the industry that weaving is usually the best shielding solution, and it can easily provide up to 85dB of isolation from external noise.
To reduce the number of lines in and out of the system, medical devices can use hybrid cables and connectors to combine power, signals, and triggers into a single connector and cable system. Note, however, that inside the connector, there is a power pin on one side and a signal pin on the other side. But more importantly, the cable from each metal circular connector to the main interface connector is a hidden braided shield.
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Flat cable is a standard organization and is suitable for mobile electrical equipment with AC rated voltage of 450v/70v and below. Flat structure is especially suitable for frequent bending occasions, without kinking and folding neatly, such as driving. Yb, YBF and YBZ products can meet the needs of various occasions. It is suitable for the electrical connection between mobile electrical equipment in the harsh environment of power generation, metallurgy, chemical industry, port and so on.
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