Med-Tech Innovation What’s New


WHAT’S NEW


Non-magnetic miniature connectors


Axon’ Cable has introduced a line of small, robust and extremely non-magnetic connectors as part of its Micro D connector range. These miniature connectors are designed for devices that rely on magnetism when operating. This is the case, for example, for MRI scanners where the magnetic field generated must remain constant and stable to obtain reliable and high quality 3D images.


The connectors not only have a low residual magnetic field (less than 1 nT, which is approximately 50,000 times lower than the earth’s magnetic field), but it is also almost impossible to magnetise them, says the company. Therefore, they cannot interfere with the magnetic fields produced by the magnets of medical imaging devices. The residual magnetism of these new connectors is 20 times lower than Axon’s existing range of non-magnetic miniature connectors and the Twist Pin contacts, which assure a permanent contact, are non-magnetic. Micro-D connectors are designed to cope with severe requirements: robustness, long life, low contact resistance, dielectric strength, vibration and shock. Axon’ Cable Ltd Tel. +44 (0)1383 421 500, www.axon-cable.com


Micro dosing pump


Bürkert’s product range has been expanded to include a new micro dosing pump. The 7615 self-priming, diaphragm pump has been designed for precise dosing in the microlitre range and combines high dosing accuracy and precision with chemical inertness. The valve body is made from PEEK and seals are available in FFKM and EPDM. The new pump is suitable for use with a wide range of neutral as well as aggressive liquids. The 7615 has three valves that can be operated to allow pumping in two directions as well as being simultaneously opened to allow flushing of the pump. The dosing quantity ranges from a minimum of 5 µL per stroke up to a maximum of 8 mL per min in both directions. With an accuracy of reportedly less than ±2%, the new pump is suitable for precise dosing of the smallest quantities of liquids. Bürkert Fluid Control Systems Tel. +44 (0)1285 648 720, www.burkert.co.uk


46 ¦ September/October 2013


Micro extruder to minimise thermal degradation


American Kuhne has introduced a 16 mm micro extruder designed to process fluoropolymers for miniature medical device applications such as fine wire jacketing for neuromodulation, microdialysis tubing and neonatal intravenous catheter tubing. These applications typically require an extruder that can process high performance fluoropolymers (ETFE, PFA and FEP) at very low volumes down to 3.4 gm/min.. Unlike most medical grade thermoplastics such as polyurethane, nylon and Pebax, it is difficult to process fluoropolymers on extruders smaller than 16 mm, because the special corrosion resistant screw materials that are used such as Inconel and Hastelloy have low torsional strength and are prone to break at diameters below 16 mm. Consequently, the smallest extruders for these applications have traditionally been 19 mm machines. The benefit of a 16 mm extruder for micro extrusion applications is an


approximate 45% reduction in the minimum output rate and a short residence time in the barrel, which helps to minimise thermal degradation, particularly compared with traditional size extruders of 19 mm and 25 mm running at very low screw speeds. American Kuhne Inc. Tel. +1 401 326 6200, www.americankuhne.com


Multi format 180 W power supply


XP Power has added to its GCS series of single output high efficiency “green” AC-DC power supplies. The GCS180 range has a power output capability up to 180 W and all models have a no load input power of less than 0.5 W and a typical efficiency of 93%, says the company. They are available in multiple mechanical formats giving the designer several mounting configurations to choose from to suit the end application. Convection cooled formats, providing up to 150 W output, are in an industry standard 127 x 76.2 mm open frame package; an optional enclosed cover option is also available. The full 180 W output is available when a forced airflow of 7 CFM is provided by the user or by using the optional top or end mounted fan formats. Across the range, five single output models are available covering the nominal outputs of +12, +15, +24, +28 or +48 VDC. An additional 12 V/0.6 A fan output is standard. Designers also have the choice of using an input earth connection or not, due to the Class I and Class II input construction used. A remote on/off feature is available across the range by specifying the –R option. The GCS180 series meets the Class B limits of EN 55011 and EN 55022 for conducted emissions and Class A limits for radiated emissions with no additional filtering components required. Complying with UL/EN 60950-1 and the current 3rd edition EN 60601-1, ES 60601-1 and CSA22.22 No 60601-1 per cUL, the series is suitable for a range of applications. XP Power Tel. +44 (0)118 984 5515, www.xppower.com


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