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What do you do when regulatory requirements exceed that of reasonable engineering controls; examples and lessons learned from 25 years in the trenches

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Information about What do you do when regulatory requirements exceed that of reasonable...
Health & Medicine

Published on February 22, 2014

Author: UBMCanon

Source: slideshare.net

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Justin Metcalf, Manager, Bench Testing, MED Institute, Inc.
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What do you do when regulatory requirements exceed that of reasonable engineering controls? Examples and lessons learned from 25 years in the trenches. Justin Metcalf MS, Brian Choules, PhD, MED Institute, Inc. www.medinstitute.com 1

Overview • Company introduction: Who is MED Institute? • What is ISO 17025 and why is it important? • Requirements – Regulatory – Company – How they interact • Methods for rectifying the gap between regulatory and company requirements • Practical examples • Conclusion 2

MED Institute Introduction • MED Institute is a Cook Group Company, located in West Lafayette, IN • We have been in business since 1983, and have over 30 years of experience in the medical device industry – Non-clinical Testing Services – Regulatory Consulting – Clinical Trial Management • ISO 17025 Accredited Laboratory (Cert # 2194-01) • ISO 13485 Certified (BSI) • Inspected to Good Laboratory Practices (GLP) • We contribute to 16 medical device standard committees (ISO, ASTM, AAMI) • 250 staff members including physicians, nurses, engineers, regulatory scientists, physiologists, biologists, veterinarians, and statisticians 3

MED Institute Introduction • Experience with regulatory bodies – FDA, CFDA, PMDA, CE notified bodies • Work with companies around the globe • Additional areas of specialization: – Publications and research – Ophthalmology – Vascular – Obstetrics/Gynecology – Urology – Pediatrics – Endoscopy – Cardiac – Orthopedic – Critical Care Medicine 4

MED Institute Introduction • • • 90 test methods accredited to ISO 17025 including: – MRI Safety Analysis and Testing – Durability/fatigue testing – Failure analysis (FTIR, SEM, EDS) – Simulative use – Corrosion – Particulate counting and sizing – Radiopacity CERT #2194-01 Testing Laboratory Complete ISO 25539 series as well as many other standards list on our accreditation Cert # 2194-01 Multiple areas of research and publication including fatigue to fracture, failure analysis, and corrosion 5

What is ISO 17025 and why is it valuable? • ISO/IEC 17025 is a set of general requirements for the competence of testing and calibration laboratories and is the predominant ISO standard used by testing laboratories – Method validation required for non-standardized methods – Promotes best scientific practices through: • Uncertainty analysis • Interlaboratory comparisons • Test method monitoring • Calibration traceability • A proper scientific foundation is important and accreditation is one way to prove your expertise 6

Definition of a requirement • A thing demanded or obligatory: Dictionary.com • Something that is needed or that must be done: Merriam-Webster • Requirement synonyms: need, wish, demand, want, necessity, prerequisites, requisite, precondition, stipulation, specification… • It is crucial to assess your requirements carefully before initiating non-clinical testing 7

Regulatory requirements: some sources Reference to standards (ISO, ASTM…) Equivalence to predicate devices Guidance documents Literature Requirements 8

Company requirements: some sources Physician interactions Requirements for a “new device” Feasibility clinical studies Literature Bench and animal work Company requirements are documented in risk analyses or design inputs. Reference to standards (ISO, ASTM…) Guidance documents Equivalence to predicate devices Literature Requirements for a device with a predicate 9

Ideal Situation We all have the same goal: a safe medical device. Occasionally, the regulatory and company requirements are the same. Company Requirements = Regulatory Requirements 10

Real World The practice of medicine may result in each global regulatory body having requirements that differ from the company requirements. These differences will need to be reconciled to gain approval. Company Requirements Regulatory Requirements 11

Reasons for the differences in requirements • Regulatory bodies can adopt requirements without the knowledge and clinical experience that many companies have • Knowledge and technology advancements occur faster than regulatory bodies can adjust requirements • Example: Generalized physiologic models and acceptance criteria are rare and once they are developed, science or medical devices have generally moved on to a new front • Regulatory requirements are not generally publicized and companies must determine acceptance criteria during device development 12

Reasons for the differences in requirements • Standards lag technology – Standards might lack all the necessary requirements that help establish the safety and effectiveness of the device. – It should be noted that standards cannot always envision new design concepts or can have requirements that become outdated based on emerging knowledge. Thus, complete compliance to standards might not always make sense. • We all want to help patients, but to fulfill a regulatory requirement that is not warranted is expensive and time consuming. • How do we resolve a difference in a way that minimizes effort? 13

So how do we resolve differences between regulatory requirements and company requirements? • Educate yourself on the clinical environment – Research – Cadaver studies – Physician interactions – Clinical feedback • Explants and clinical performance – Endurance limit testing • Educate your regulatory body – Submission specific meetings – General information meetings – Industry wide working groups – Collaborative research – Project based agreement prior to development or after model/test development 14

So how do we resolve differences between regulatory requirements and company requirements? • Testing (“A good test is worth 10,000 words, a bad test is worth 1,000,000”) – Develop physiologically relevant model • Validate with physician feedback • Existing device performance – Build your rationale – Model improvement • Clinical performance vs. bench • Clinical feedback 15

Practical Examples • Example 1: Clinically relevant bifurcation tracking model – Company requirement • Device must advance, deploy and withdraw in an appropriate clinically relevant anatomy – Regulatory requirement • Justify your model to include tortuosity and a bifurcation radius that is representative of a worst case anatomy 16

Practical Examples • Example 1 cont. – Option 1: Agree with the regulatory body • Find an overall worst case – Option 2: Justify why your current requirements are adequate • Use literature and physician feedback – Option 3: Work with regulators to come to an agreement on an appropriate new solution 17

Does a perfect model exist? Everyone wants to find and test out the worst case The “one size fits all” solution doesn’t exist Bing images 2/5/14 18

Practical examples • Example 2: Tissue replacement therapy – Company requirement • An experienced operator must deliver the cadaveric tissue to its intended location without damage and results must be better than or equal to the standard of care – Regulatory requirement • Model and results must match those of a recognized scientific journal article 19

Practical examples • Example 2 cont. – Option 1: Agree with the regulatory body • Perform the test as specified by the regulatory referenced journal article – Option 2: Justify why your current requirements are adequate • Physician feedback and publication – Option 3: Work with regulators to come to an agreement on an appropriate new solution 20

Practical examples • Example 3: Breakdown Corrosion for implantable metals – Company requirement • Breakdown potential to be greater than that of a device with successful clinical use – ASTM agrees with the criterion – Regulatory requirement • Breakdown potential must be greater than 600 mV – This was an example of regulatory bodies and companies reaching for a relevant acceptance criterion without appropriate scientific backing 21

Practical examples • Example 3 cont. – Option 1: Agree with the regulatory body • Set 600 mV as the criterion – Option 2: Justify why your current requirements are adequate • Educate the regulatory body on an alternative appropriate criterion • Clarify language in the standard – Option 3: Work with regulators to come to an agreement on an appropriate new solution 22

Practical examples • Example 4: Stent durability conditions • Stent must maintain its function for predetermined number of cycles to clinically relevant loads – Regulatory requirement Alternating Strain – Engineering requirement • 10 year fatigue life justified but without specific loading conditions • Bridging the gap between a clinically relevant fracture rate and regulatory is difficult in a global regulatory environment Mean Strain 23

Practical examples • Example 4 cont. – Option 1: Agree with the regulatory body • Redefine loading conditions or redesign the device – Option 2: Justify why your current requirements are adequate • Physician feedback and publication – Option 3: Work with regulators to come to an agreement on an appropriate new solution • Educate yourself on the clinical relevance of fractures • Educate the regulatory body on clinical relevance of fracture 24

Practical examples • Example 5: MR device deflection – Engineering requirement • Device should not have a deflection force that is clinically impactful – Regulatory requirement • “If the mean value is less than 45°, the magnetically induced deflection force, is less than the force on the device to due gravity (its weight)” ASTM F2052-06 This is a statement in the standard that has been adopted as a criterion 25

Practical examples • Example 5 cont. – Option 1: Agree with the regulatory body • Label your device unsafe – Option 2: Justify why your current requirements are adequate • Physician feedback and publication • Clarify language in the standard – Option 3: Work with regulators to come to an agreement on an appropriate new solution • Educate yourself on the clinical relevance of deflection force • Educate the regulatory body on clinical relevance of deflection force 26

Conclusions • A proper scientific foundation is of the utmost importance • Appropriate multi-device criteria and models are rare, most devices require a specific model and criteria • Education and scientific publication is important • Communication with regulatory bodies early and often is necessary • Continuous improvement of models and methods is needed 27

MED Institute • Booth 3194 • Our Mission – Through forward looking test development and careful bench testing, we apply scientific and engineering principles to help safe and effective devices efficiently reach the global market to benefit patients www.medinst.com Brian Choules bchoules@medinstute.com Justin Metcalf jmetcalf@medinstitute.com 28

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