Contacts for medical applications

When manufacturers of active implantables need low-force, low-resistance contact solutions they can be confident about, they turn to us. For more than 20 years our electrical contact technology — based on the simple, robust Bal Spring™ canted coil spring, has been making and maintaining reliable connections in pacemakers, defibrillators, neurostimulators and many other critical electronic devices used to deliver life-improving therapies to the human body.

Bal Conn® electrical contacts

Already at work in more than 1 million implantable devices worldwide, our Bal Conn® electrical contact remains the stand-alone solution of choice for OEMs seeking to ensure consistent, reliable connections in implantable pulse generation devices used for neuromodulation and cardiac healthcare. For over two decades, the Bal Conn has been helping manufacturers improve device performance and push the technology envelope. It has also dramatically simplified the process surgeons use to connect lead wires to implantable electronic units across the therapy spectrum. The Bal Conn offers very low electrical resistance and a redundant point for reliable connectivity. Typical applications include cardiac defibrillation, cardiac pacing and cardiac resynchronization.

Technical specifications

Application Lead Diameter (mm) Force Category Breakout Force (N) Running Force Range (N) Housing Material Spring Material Static Contact Resistance (mohm)
Max From To Nominal Tolerance
Neuro (bi-directional 1.35 Medium 1.20 0.09 0.40 MP35N® Platinum Iridium 70 ± 20
Light 0.70 0.07 0.30 316L Platinum Iridium 600 ± 200
Titanium - Medical Grade Platinum Iridium 350 ± 150
MP35N® Platinum Iridium 80 ± 30
Platinum Iridium Platinum Iridium 40 ± 15
IS-1 (bi-directional) 2.67 mm Medium 3.10 0.50 0.90 316L MP35N® 100 ± 60
IS-4 (uni-directional) 3.20 mm Heavy 2.70 0.50 1.00 MP35N® MP35N® 80 ± 50
IS-4 (bi-directional) 3.20 Medium 2.70 0.25 0.75 Platinum Iridium Platinum Iridium 40 ± 20


This data is presented for comparative purposes only, and it represents the performance of the Bal Conn electrical contact under specific design parameters. Customer results may vary depending on application requirements and other factors.

SYGNUS® implantable contact system

The SYGNUS® implantable contact system is the world’s first integrated seal and electrical contact system for active implantable devices. It is engineered to help large and small device OEMs accelerate the development process and dedicate valuable resources to therapy and function improvements, instead of component procurement and testing. This innovative system combines proven electrical contact technology with pre-tested silicone seals, resulting in a densely spaced connector “stack” that can accommodate leads with diameters ranging from 0.90 to 3.20 mm. The system’s contact element consists of a housing made from medical-grade MP35N® and a Platinum-Iridium or MP35N® canted coil spring. The spring contact offers low insertion force, provides multipoint conductivity, and compensates for both misalignment and mating surface irregularities. The configurable system combines electrical contact and fluid/electrical isolation components in a compact design with a pitch of about 2 mm — the smallest in the industry. Options include standard sizes for variable stack arrays. For more details, go to the SYGNUS web site.