Tuesday, October 11, 2016

Molding Press and Tooling V&V

A recent webinar on V&V Planning I conducted resulted in the following questions (and my answers):

 We are planning on performing Validation(s) for mold tooling that  will produce parts that go into a Medical Device. We are not making the completed device here (as yet) but simply making some of
the molded components.

Ques:  As such, do our molding machines need to first be validated? I am presuming so.

Ans:  Yes.  Even if you do 1st articles and additional QC on the molded parts. One of the adversary
 audit remediations I performed dealt with this, meaning the mandate came from an FDA District
Office after review of the 483.

Ques: Does this mean a full validation of the machine(s) themselves;   IQ, OQ, PQ?

Ans:  Yes.  IQ would include leveling, water, hydraulics, and electrical.

Ques:  If yes, what constitutes the OQ and PQ portion of such a validation?

Ans:  OQ would verify general operation.  Specific parts are validated separately to address resin, establish set-up card information / parameters et al.

I did a 550 T C-M press, HW and SW, and used a fold-out schematic addressing “machine states”
to develop many of my test cases.  The OQ verified the initialization, operation of the software –
“black box” – by the hardware’s performance for each of the states, as well as temperature,
pressure, et al, that everything cycled as expected or as set.  The PQ’s ran thru each of the above (machine states et al)  for n=?  with ? determined by the variability in the process (an existing
sampling SOP and/or industrial statistician or similar can provide sample sizes, or see Juran and
Gyrna’s Quality Planning And Analysis Text, any edition for rationales for sample sizes down to

Although mine involved a dedicated press (one tool), in your case I would determine the most
difficult one or two parts / tools and use that with a well thought out and documented rationale.   Include an explanation of your downstream verifications / QC required for any
molded part, e.g., 1st articles, other QC in Molding and/or Production / Assembly in your Test
Report justifications for any reduction in test cases / sample sizes, which such would allow.

In my case, a review of the press manufacturer’s  C++ module list (which I obtained by a call to
their tech support) showed the company did a FAT, so I requested a copy, and incorporated most
 in my V&V, reducing some of the additional V&V.  

Ques:  Can you use "any old mold" or does it require a specific mold to be used?

Ans: See above.

Ques:  Doesn't this constitute the "chicken or the egg" syndrome if using  a mold that is yet to be qualified?

Ans:  A common occurrence.  Do some qualification before, e.g., flow studies, part dimensional,
part stress,
venting, shot / fill and similar, which may have been done on another press -- document.  Then do
the above, if this is your most troublesome molded part.

Ques:  You spoke of software/hardware validations;  We rely upon the SPC and Parameter software
 that is part of the molding machine(s) themselves to provide us with consistent molded parts; do
we need  to have this built in software validated?

Ans:  Yes.  And it might also involve 21 CFR Part 11, depending upon how the SPC data is used.  This could be a separate V&V.

Ques:  If so, how does one go about doing such; generally speaking?

Ans:  As addressed briefly in the webinar, but I would also add something similar to an Excel macro
V&V, where you compare data so generated by your equipment with an independent source,
gauges (cal’d) and a calculator using a  textbook formula or similar independent source, all recorded
 in the Test Report.

As mentioned.  If the above seem intimidating, start simpler and address high [patient] risk items,
then later add others as CAPA feed back or other CGMP requirements require and your experience
with the system dictate.

--  John E. Lincoln       jel@jelincoln.com

No comments:

Post a Comment