Motorensysteme in der Medizintechnik
At least 50,000 patients in the year die in Europe at infections, which acquired them in the hospital. With this alarming number the German society for hospital hygiene (DGKH) put the finger to at the beginning of the yearly 2008 into a serious wound: Antibiotics resistant germs are in the hospitals on the advance. The demand for more hygiene in the operating rooms includes also the surgical tool also. Medical power tools such as drill presses, saws or milling machines are used today with many surgical interferences and orthopedic operations. By osteosynthesis if a broken bone is fixed with the help of a plate, drill presses and screwdrivers come to the employment. In the Prothetik serves a handy Lavage system to the cleaning of the bone bed for an optimal bone cement interface after the operation must the tool be thoroughly cleaned and sterilized. Steam sterilization is the most common procedure for killing of microorganisms in the hospital and in that practice-surgical tools with different engines is propelled. Electric motors - akkubetrieben or cable-bind - compete with pneumatically propelled systems. But each drive system is not suitable equally for the sterilisation with water vapour. The sterilization property is treated with pure, satisfied water vapour up to 134 degrees Celsius, which affects all surfaces of the instrument cleaned before. As extremely good suitably for the sterilisation with steam pneumatic motors of modern design prove. With electric motors the danger of a short-circuit threatens. Batteries can be damaged by the treatment with steam in autoclaves. They are loaded from there outside of the operating room and remain thus unsteril. A clear disadvantage in relation to compressed air systems, which are completely sterilely made available beside the optical in the operating room. The DEPRAG SCHULZ GmbH and CO. in the upper-Palatinate Amberg is a renowned specialist for the production of high-quality pneumatic motors. With the series 67 - it offers a high-grade steel compressed air sliding-vane motor program, which is suited without problems with steam sterilizable and thus for the employment in the medical technology. The engine spindle of this series is also made of high-quality high-grade steel and resists also aggressive cleaning agents. All engines are not perfectly sealed, it can leakage air withdraw. The internal positive pressure in a pneumatically operated tool prevents besides the penetration of dirt, an advantage, if one thinks of employment in the operation surrounding field. With the DEPRAG sliding-vane motors made of high-grade steel the manufacturer of medical power tools has an optimal drive, in order to follow the high requirements of the market. With the organization of the engines for applications of medical technologies to smooth surfaces much value put � facilitates the cleaning and contributes to perfect hygiene. The principle of the pneumatic motor is simple. Compressed air produced by compressor shifts the engine in rotation. With the sliding-vane motor happens in the following way: The rotor rotating in an eccentric cylinder is set in motion. In its slots are the lamellas. Now by centrifugal energy outward against the cylinder wall to be pressed. Thus Chambers for Employees' Welfare for itself expanding compressed air form. Over this expansion of expanding compressed air the pressure energy changes itself into kinetic energy � the rotating motion develops. What for demands places the surgeon beside the sterilization barness against a modern surgical tool? Strong, compact engines are to propel their drill presses with on the right of and left hand motion to the thread cutting (with a number of revolutions of approx. 800 revolutions/minute and a torque of up to 4,5 Nm), their pass and reciprocating saws (at a number of revolutions of approx. 16,000 revolutions/minute work), as well as bone milling (with a number of revolutions from approx. 250 revolutions/minute and a torque to 14 Nm). The tool is to be easy thereby and ergonomically well in the hand lie � an operation takes several hours finally sometimes. The professional world assumes in the USA about a quarter of the surgical motor operated tools assistance of a pneumatic motor are propelled. That above all, because they can be attached easily to the existing compressed air network in hospitals. In Germany and im �brigen Europe is present the compressed air infrastructure in hospitals to a large extent and can without large cost be maintained. That speaks to a considerable degree for the use of pneumatically operated tools in the operating room. Modern Akkusysteme is more reliable and more long-lived by the use of left ions than the predecessor technology, but in the comparison to the Akkuleistung compressed air is available for an unlimited period, no matter how for a long time the operation lasts. Electric motors exhibit a further large disadvantage: Under load the engine develops heat, which would not drive off themselves well leaves. Under continuous stress electrical systems can so generally warm up. In order to avoid an overheating of the system and thus possible injury from patient or user to, one cooling time is to be considered. With the pneumatically operated system is that different: � overheating is with the pneumatic motor by its function impossible �, like that Dagmar Hierl, Produktmanagerin of the DEPRAG SCHULZ GmbH and CO. � by the relaxation of air the engine under load cools down. � the pneumatic motor can be loaded problem-free up to the stop and takes thereby no damage. After reduction of the load it runs problem-free and that arbitrarily often one behind the other, also with high cyclic duration. That makes a pneumatically operated tool fail safe and reliable. The output is almost constant with the pneumatic motor over far speed ranges. It can be operated from there also in a broad field of changing loads optimally. The number of revolutions can be steered by throttling of the amount of air steplessly. The surgeon can adapt necessary engine performance problem-free to the specific requirements. So it can e.g. stop the Pumpenleistung with a Lavage system on the bone density of its patient. Main advantage of the pneumatic motor as drive is its large power density. Depending upon execution it needs only one fifth of the mass of a commercial electric motor or a third of its size. Surgical tools should be small and extremely handy. Understandably, if one thinks of the millimeter-exact employment in a limited OI field. A standard DEPRAG pneumatic motor from high-grade steel with an integrated planetary gear and an output of 400 W is long only 61 millimeters and measures in the diameter 32 Millimeter.Im operating room must a drive oil-free work as also in food or chemical industry. For the DEPRAG pneumatic motors a problem, only the inexpensive lamellas are not to be exchanged as wearing parts from time to time. For the employment in the pure area without oil the manufacturer for this application offers adapted special lamellas. Small maintenance costs speak for itself. Opposite battery-operated engines, with which the new acquisition of the Akkus does not represent a cost factor which can be underestimated with the maintenance of the systems, a pneumatically claimant drive is sturdily, everlasting and over years with small maintenance costs applicable. The DEPRAG Advanced series 67 covers engines with different equipments in an attractive price performance ratio. Various drift spindles are just as contained in the standard program as different motor attachments. Customized engine solutions like ferrite-free drives made of glass ceramic or plastic, which find their employment e.g. in the magnet resonance therapy, are likewise available.
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