Surgical Instrument Supplier-Certification?

My company manufactures surgical instruments.  A few products we sell are those purchased from another supplier.  Often times these purchased products are used in conjunction with our own instruments.

We're accustomed to receiving, at the very least, a certificate of conformance statement from suppliers, if not a material certification or analysis. 

One recent supplier claims the manufacturer of the product they are supplying us will not release any information.  We don't know if the product truly is what they say it is; though it "looks" right!

Are there any regulations for supply stores to release product manufacturer info?  I've perused the web and found that some supply stores provide manufacturer brochures or simply the name of the manufacturer for purchasers to reference.