There is a wide span of medical device products in different fields. For pharmaceuticals, there are some differences between different therapeutic areas; however, from the operational point of view of clinical trials, the difference is not very large and can be compensated for by learning a little bit about the new field of product knowledge and background knowledge. For devices, different fields of devices, almost is a completely different operation process, such as in vitro diagnostic reagents (IVD) and implantable devices, the whole trial target groups and executives are completely different; ophthalmology, dentistry and large-scale imaging equipment, the protocol design and assessment indicators are not comparable; active and passive medical devices, follow the standards of the two systems. Comparatively speaking, implantable devices are perhaps the closest to drugs. For practitioners, even if they are familiar with doing clinical trials for one type of device, they will likely have to learn from scratch when they switch to another field. Those who are used to implantable devices may not understand how to do in vitro diagnostic trials at all; those who used to work on ophthalmic products may be puzzled when they encounter CT/MRI products. Therefore, when people engaged in clinical trials of devices switch positions, they tend to pay attention to the continuity of the product field as well. The effectiveness of device products relies to a certain extent on physician manipulation. Drugs enter the human body, there are different ways, oral, intramuscular, intravenous and so on, different people operation, there may be a little difference, but it will not be too obvious. For medical devices, especially implantable devices, the results may be very different when operated by different doctors. In other words, if a drug is effective, as long as the clinical trial is well-designed and the operation meets the requirements, the results will also be effective; but for devices, if there is some problem with the doctor's surgical operation that is not detected, it is very likely that the final results of the trial will be the opposite.
The so-called franchise stores, generally refers to stores specializing in a certain type or a certain brand of goods, it actually includes the national industry standards in the professional stores, franchise stores and home building materials stores. National standards for professional store is defined as: to specialize in a major category of commodities based on the retail business; the definition of the franchise is: to specialize or authorized by a major brand of commodities based on the retail business, also known as franchises, partnership stores, chain stores, stores, such as image; home building materials store is defined as: to specialize in the sale of building materials, decorative, home furnishings based on the retail business. It can be seen that these three types of business situation, although there are obvious differences, but from the perspective of the professionalism of the range of business goods they **** the same point so that it can be a whole as the object of study, belong to the specialization and depth of operation of the franchise.