3D flexible circuits will help lighten medical equipment

- Dec 31, 2019-

3D flexible circuits will help lighten medical equipment

The miniaturization of medical devices, so manufacturers need to use flexible circuits to match three-dimensional packaging and tighter pitch and line width of flexible copper cables. As device package sizes continue to shrink, soft circuits must also shrink. As device packages continue to shrink in size, integration of features such as blind insertion and buried vias maintains flexibility.


For small and lightweight designs of complex, high-density circuits, reliable soft circuits are an excellent choice. Compared with traditional circuit boards, the thickness and weight of flexible circuits are much smaller, which can reduce the weight of any product, thereby improving the mobility and comfort of patients, and often can save costs.


Better packaging

Soft circuit is a powerful tool that can improve the effect of electronic packaging. A well-designed mechanical package has high consistency and reliable mechanical properties, which helps the flow of airflow; and the package may contain a variety of electronic components, such as connectors, transmitters, receivers, Resistors, capacitors, etc. Such components must be contained in tightly packed packages that use electrical interconnects. Soft circuits enable such designs.


Soft circuits allow designers to route circuits along any curved surface and in multiple directions on any axis, as opposed to rigid circuit boards that only allow the arrangement of circuits on the X and Y planes.


To design an effective package, the designer of the device and its supplier must work closely together. The design of soft circuits must involve a trade-off between electrical and mechanical performance.


This kind of package design can also be combined with "Rigid Flex" circuits. This circuit contains both rigid and flexible substrates, both of which are laminated in a single structure. For example, a certain part of the device may include a variety of electronic components, such as resistors, capacitors, connectors, processors, etc., which are rigid parts; while the flexible electrical "tail" can be drawn from the rigid part, there is no need to Use interface connectors.


The next generation of soft circuits


 The size of soft circuits used in medical devices will continue to shrink, and performance will continue to improve. One of the most promising products in this field is DuPont's Pyralux TK copper clad laminate and adhesive sheet system. This system is made of specially formulated Teflon fluoropolymer film and DuPont Kapton polyimide film.


Pyralux TK allows developers to make multilayer circuits that can be bent around smaller radii. Compared with standard polyimide soft component materials, it can provide a higher data rate and reduce overall insertion loss and noise in a smaller physical volume. The application target for this type of soft and layered circuits is next-generation 12 and 25Gbps device designs. Molex has partnered with DuPont to develop the required processing technology to apply Pyralux TK to Molex's soft circuits. This new type of circuit has also been adopted by many electronic devices.


During the continuous development of medical technology or medical technology, digital connection technology will bring many valuable opportunities for device designers and establish new business models that help reduce medical costs. In any case, soft circuits will definitely play a key role in this process.

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