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How SWL™ came to be called a 'fourth generation' device


The discussion was about computers. A group of excited researchers was discussing how computers had evolved- from big, cumbersome machines in earlier times to the compact and efficient machines of today. A researcher likened the evolution to 'generations'- generation one computers, generation two computers and so on.
One of the researchers testing SWL™ on the bench smiled and said "I think we can call SWL™ a fourth generation dialysis device."
"How?" the others wanted to know.
"Well, it's like this. The first generation dialysis devices were simple devices consisting of membrane tubing tied with threads."
"Sure, what next?"
"Tying the threads and opening them was very cumbersome."
"It sure was."
"Yeah! Then somebody invented the tubing clamps. Life became simple- just press the clamp and that's it. No struggling with threads. A 2nd generation device had been born."
"What about the third generation devices?"
"Sure, I am coming to that. Fabricated devices e.g. those in which membrane is fixed in a plastic frame (dialysis cassettes), represented an advancement over clamps. Sample loading was made easier- you could inject your sample easily, holding the device in your hand, using syringe and needle. These devices can be called 3rd generation devices."
"And how come SWL™ is a 4th generation device?"
"Simple- it is the latest device, offering a host of features not available in earlier devices. Unmatched simplicity- no threads, clamps or syringes required. Unbelievable new features- online volume monitoring, multiple sample recovery at one go, gravity based sample recovery and even storage of sample within the device, without removal from device. Truly a simple device with advanced features- a fourth generation device."
"Wow! What an apt comparison!"