I like to know the general guide for medical moldings and comment defects encountered in shop floor.
1. How do medical molding differ from normal moldings like consumer goods or automotive parts? Is there really any difference?

2. Common design challenges in medical moldings?

3.Common defects in medical moldings

4.General design guide for medical molding.

Please anyone can help on this topic! Thanks in advance.

The same good molding practices that one uses in automotive or consumer goods production apply to medical molding, but are even more stringently documented. These include material traceability and dryness and process documentation.

Common design challenges are things like wall stocks that vary greatly, and parts that can survive sterilization by various methods and exposure to harsh chemicals in use.
In addition to the regular defects, one sees contamination issues, especially even microscopic quantities of other non-specified resins.
Design guides are similar to most plastics parts. 

medical moulding are simply mouldings that are used for medical applications and as such the design guides and moulding practices vary little from those used for many other industries. The material selection is important as mentioned above in that autoclaving or sterilisation can be an issue for many materials although there are mdical grades of many common materials including nylon, Acetal, PEEK and PBT. There also can be additional expense in certain medical appplication due to the need for clean room environments and the purety of the granuals/powder used, with some requiring ionic purity. Costings for medical tend to be pricey for this reason and are regularly considered to be consumable products.

Thank you all. It was useful in knowing about medical molding from you all.