products, suppliers can verify that the legal and regulatory requirements relating to the chemical and mechanical properties of the steel are met.
Surgical power tools, such as saws used in orthopaedic surgery, convert rotary motion from the motor into linear motion. The bearings are critical to tool movement and efficient, uninterrupted operation. HQW was recently commissioned by a
surgical power tool manufacturer to develop a new bearing unit for a high-performance surgical saw. The bearings had to fit inside the tool’s slimline design, while still offering the necessary stability to accommodate high loads and operating speeds, while also offering a maximum level of corrosion resistance. The experts at HQW Precision recommended
a needle roller bearing unit. As the system is sterilised on a regular basis, a special material with a high chromium content of around 20% and a high level of corrosion resistance was chosen for the needle bearing ring. Needles produced from the material SV30 and a cage made of PAI were also used. The bearings are located near to the end of the
cutting tool and often operate within the patient’s body. For this reason, a special biocompatible lubricating grease was specified. The bearing unit was also required to operate with a high degree of precision and low backlash to ensure that the saw worked precisely and thus achieve the best
possible surgical result for both surgeon and patient. The small bearing unit measures 4 x 13 x 8mm, with the fit between the individual bearing components amounting to just a few microns. Thanks to this improved design, the service
life of the surgical device has increased many times over, thus contributing to patient safety throughout the entire life cycle of the medical device.
A wealth of applications exists for rolling bearings in medical technology – from implantable devices, heart pumps and breathing apparatus, through to high-precision surgical instruments and robot-assisted surgical equipment. Maximum reliability and fail-safety take centre stage here, alongside often varying demands on material and properties. Optimal results, as in the
above example, are achieved when designers of the medical device or component work closely with experts in precision bearings. To help, HQW offers
comprehensive services – fromthe design and engineering of suitable bearing systems to comprehensive tests and analyses in an internal, state-of-the-art laboratory. In addition to being used by leading
Cross section of a bearing used in
medical power tools Cross+Morse Power Transmission Manufacturing Specialists
- CNC lathes, Vertical Machining Centres - Hobbing, Shaping, Gears, Sprockets & Pulleys - CAM Design & Development
Yes, we can make it ! Since 1984
companies in medical systems, HQW precision bearings are also being used in the aerospace industry, high-speed machine tool spindles and robotics applications.
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