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Efficient Connectors Enable Shrinking Medical Devices
By Ed Garstkiewicz, Industry Segment Manager, HARTING North America
improves and expands patient diagnostics inside and outside healthcare facilities. For example, portable medical instruments such as glucose
T
he need to minimize healthcare costs is cre- ating greater demand for medical electronics equipment that, among other things,
connector technologies that allow greater minia- turization to improve the product’s portability and functionality while assuring it can be used safely.
Electromagnetic Interference When we consider information transfer, small
SMT miniature connectors provide high contact density and can be stacked.
meters, blood pressure monitors, and oxygen meters can be designed with communication capa- bilities to provide continuous information to care- givers almost anywhere. Small handheld devices can also improve var-
ious diagnostic procedures in dentistry and med- ical offices. While such devices hold the promise of improved care at lower cost, they require advanced
portable medical devices typically transmit data to healthcare providers wirelessly or by cabled LAN networks. Electronic connectors are essential ele- ments in these connections and must work flawless- ly without contributing noise or distortion to the sig- nals. Often, despite careful system design, electro- magnetic interference and noise can find its way into data lines. In the past, adding separate sup- pression devices to protect the data communications interface circuit from electromagnetic interference, noise and electrostatic discharge — the transfer of static high voltage from a human body —also added bulk and cost to the final product. Now, D-sub connectors (the most common digital I/O interface) are available with built-in fil- tering that minimizes these dangers. They can be purchased with inductive ferrite filtering in the PCB material holding the connector pins. This cost-effective, low-level filtering has minimal insertion loss while reducing EMI emissions that might otherwise be close to the specified limit. Another approach in D-sub filtering is a
patented four-layer PCB material with surface- mount chip capacitors. The filtering performance of the capacitors and screening effect of the PCB protects against any introduction or radiation of noise through the I/O port. Ringing and crosstalk are virtually eliminated.
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Built-In Filtering Filtered D-sub connectors are available from
HARTING and others in a wide range of configura- tions that include standard and custom pin-outs, various housing and hood styles, cable and bulk- head mountings, surface-mount types, straight and right angle pins for PCB reflow soldering, etc. Built- in filtering eliminates or reduces the need for sepa- rate suppression devices, resulting in smaller, less- costly data communication circuit board designs.
October, 2016
D-sub connectors are available with built-in filtering.
In addition, this style of built-in filtering fits
within standard D-sub shells, allowing designers the flexibility to add filtering late in the design stage if an EMI or ESD glitch is discovered. That may avoid the need to modify a circuit board to
Continued on page 60
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