Updated fields: d4: udi: (b)(4).Dhr - there is no indication that the production process may have contributed to this complaint.All test results passed procedural specifications.Failure analysis - complaint not confirmed, the returned unit was found to work as intended, and met all acceptance criteria.Possible root causes for drill fails to disengage are: product cannot withstand multiple sterilizations and uses, impact introduction of drill to skull causes scoring on the pin, inadequate spring, drill used for multiple holes and chatter/deformation of pin / slot interface occurs, drill set incorrectly, or incorrect specification for surface finish for inner drill, outer drill and pin.
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