Design News, May 2013

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M E D I CA L DESIGN APPLICATIONS Porous Metal for Medical Applications Joining porous metal to mating components for medical and life sciences applications can be accomplished in a variety of ways. BY THOMAS N. FAHEY, MOTT CORP. P Porous metal has been widely used titanium. This technolin advanced technology applicaogy is available in a variety tions and has found a number of of form factors from very uses in the design and manufacture small discs or tubes for drug of medical devices. Porous metal delivery applications to larger 10is ideal for providing highly deinch cartridges for biotechnology and pendable filtration performance, pharmaceutical processing. This procontrolling fluid flow, as well as prietary membrane is able to withdiffusion and metering of fluids stand aggressive chemistries and drug and drugs. It can be manufactured cocktails without the potential for in many different shapes, sizes, and leaching, outgassing, or other adverse metallurgies. Rigid and robust, poreactions. Mott porous metal comrous metal affords designers novel ponents are available with filtration and unique properties that are often ratings from sub-micron (0.1µm) to the solution for challenging medicoarser filtration ratings, including cal and life sciences applications. 0.2µm sterilizing grade media. Mott Porous metal is available in materials also produces specialized gas filters known to be biocompatible includthat can achieve 99.9999999 percent ing stainless steel and titanium. Mott efficiency for particles as small as Corp. routinely .003µm. supplies compoPorous metal flow renents in 316L, 304, strictors have been used 310, and 400 series for decades to precisely stainless steels, meter the flow of critiunalloyed titanium cal gases in medical and (ASTM 1580-07), non-medical applicaas well as a number tions. Mott has sophisof other common Porous metal for medical ticated modeling and and exotic metallur- applications. calibration capability that gies including zircoenables us to calibrate the nium, molybdenum, niobium, and flow of a gas to accuracies of ±2 percent precious metals including gold, silver, at a given inlet and outlet condition. palladium, and others. Porous metal can also be designed The company also offers an allto permit the controlled diffusion of metal membrane that meets ASTM liquids or gases, which is desirable for F838-05 for bacterial retention. certain drug delivery and fluid meterMott sterilizing grade membranes ing applications. are supplied in 316L stainless steel or Mott Corp. has also developed a [w ww. d e s i g n n e w s . c om] magenta cyan yellow black Porous titanium parts. proprietary nanotechnology, which utilizes nano-powders in metals including stainless steel and titanium to produce ultra-fine, all-metal, filtration membranes. Although Mott's processes can often produce net shaped components, porous metal can be machined using modified techniques such as TWEDM, laser, or other methods. Mott has developed an array of machining processes that prevents the contamination or occlusion of the porous structure. Joining porous metal to mating components for medical and life sciences applications can be accomplished in a variety of ways. Porous metal can be welded (laser, ebeam, or TIG) to mating hardware, sinterbonded, or press fit. Over-molding using PEEK and other polymers is also a possibility depending on the component configuration and can afford exceptional strength as there is some "knitting" of the polymer to the mating porous component. Thomas N. Fahey is vice president of sales and marketing for Mott Corp. For more information, go to: MAY 2013 T R E ND WAT CH : ME DICAL / A S UP P LE ME NT TO DE S IG N NEWS T19 ES245608_DNTW1305_T19.pgs 05.03.2013 00:19 UBM

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