So technically demanding is the sealing process that the company had to create its own welding expertise no supplier was up to the task.

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Some caution is in order, however, as this more comprehensive approach would be technically demanding and possibly very costly both for the regulators and the firms they supervise.

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But the operation was so demanding technically that most urologists were afraid to try it. (One doctor likens it to backing up a tractor trailer around a curve by looking through the rearview mirror).

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