Medical Devices · PP Mesh · Implants · Mass Tort

Medical Device Litigation Expert: Featured on CBS 60 Minutes

Polypropylene mesh was marketed as safe and inert. Our forensic analysis proved it degrades inside the human body — causing devastating injuries to thousands of patients. Featured on CBS 60 Minutes.

30
+

Years Experience


200
+

Litigation Cases

38

States

3
+

Device Recalls Influenced

CBS 60 Minutes Investigation

Dr. Priddy's forensic analysis of polypropylene mesh degradation was featured on CBS 60 Minutes, exposing how thousands of patients were harmed by a material that should never have been implanted in the human body.

Thousands

Patients Injured by PP Mesh

100,000+

Lawsuits Filed Nationwide

$8B+

In Settlements & Verdicts

"It is difficult to imagine why anyone, knowledgeable about polypropylene, would recommend that it is a good idea to use PP for mesh implants."

— Dr. Duane Priddy, CBS 60 Minutes Interview

Why a Plastics PhD — Not an MD

Medical device failure is a materials science problem, not a medical one.

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PhD-Level Polymer Science

MDs are not trained in plastic science. They cannot opine on exactly why a mesh implant failed. A forensic plastics expert with a PhD and decades of manufacturing experience can prove why it failed — and that's what wins bellwether trials.

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Forensic Degradation Analysis

We analyze explanted mesh material to prove it has degraded and turned brittle. We extract residual antioxidant additives and show they have been depleted — the scientific smoking gun that proves the device was destined to fail.

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Daubert-Proof Methodology

Our forensic data determines the failure mode and proves the root cause of device failure. When defense experts claim 'PP is the gold standard material for medical implants', we can scientifically confirm or refute that claim through laboratory analysis.

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KIS: Keep It Simple for Juries

If an expert report can only be understood by a PhD, the expert work is wasted. We use simple demonstrations and analogies so laypersons understand. Many trials have been won simply because one side did a better job helping the jury understand. After reading one of our expert reports, an Attorney commented "this is the first expert report that I have ever read that I can actually understand".

Medical Device Specialties

Deep forensic expertise across every category of medical device failure.

Polypropylene Mesh Implant Failures

Polypropylene (PP) is an inherently unstable plastic that relies on antioxidant additives to remain functional. When implanted as mesh, body fluids rapidly extract these antioxidants from the high-surface-area fibers, causing them to turn brittle and break. Degraded mesh fragments into many small pieces that ingrow into organs, making removal extremely difficult without organ damage.

  • Antioxidant depletion in PP fibers from body fluid extraction

  • Mesh embrittlement and fragmentation inside organs

  • Severe pain from degraded mesh fiber migration

  • Revision surgeries required to remove embedded fragments

  • 510(k) predicate device fraud — sutures ≠ long-term mesh

SEM micrograph of degraded polypropylene mesh fiber showing structural cracking and surface erosion from in-vivo degradation

Orthopedic Joint Implant Failures

Orthopedic joint implants generally contain ultra-high molecular weight polyethylene (UHMWPE). Like most plastics, UHMWPE will eventually wear out and need replacement. However, if not properly manufactured and stored under anaerobic conditions, UHMWPE can prematurely wear out due to oxidative degradation — leading to premature joint failure and revision surgery.

  • UHMWPE oxidative degradation from improper storage

  • Premature wear from manufacturing process defects

  • Particle generation causing osteolysis and bone loss

  • Accelerated aging from gamma irradiation in air

  • Material specification non-conformance

X-ray of total knee replacement implant with UHMWPE polyethylene component for orthopedic failure analysis

Surgical Instrument & Syringe Failures

Syringes are among the most common disposable products in hospitals. A major supplier manufactured acrylic plastic syringes due to their low cost and clarity. Unfortunately, acrylic has poor chemical resistance, causing syringes to break at high rates when injecting certain solutions — exposing both patients and nurses to the administered drugs.

  • Acrylic syringe breakage during injection of incompatible solutions

  • Catheter failures from manufacturing defects

  • Plastic housing cracks leading to patient infection

  • Material selection errors in disposable instruments

  • Chemical incompatibility with sterilization processes

Acrylic plastic syringe specimens showing breakage failure during forensic medical device analysis

Diagnostic & Monitoring Equipment Failures

When diagnostic equipment fails, forensic failure analysis reveals the root cause — distinguishing between software/electronic glitches and structural material failures in the monitoring hardware.

  • Plastic housing failures in monitoring equipment

  • Connector degradation from chemical exposure

  • Sterilization-induced material property changes

  • Environmental stress cracking in device housings

  • Material fatigue from repeated use cycles

Cracked plastic cable housing on hospital diagnostic equipment exposing wires in fatigue failure analysis

Root Causes We Investigate

Every plastic product failure falls into one of three categories — and our forensic methodology identifies which one.

The Degradation Cycle

PP is an inherently unstable plastic and relies on antioxidant additives to make it stable enough to be useful. Unfortunately, antioxidant additives are extractible from the surface of parts. This is a critical problem for PP mesh because the fibers have extremely high surface area — antioxidants are rapidly extracted by body fluids, causing the fibers to turn brittle and break.

The "Inert" Lie

Manufacturers claim that PP is inert and is the "gold standard" for mesh implants. This claim is scientifically inaccurate. Gold is truly inert — but PP is not. In fact, manufacturers add antioxidant stabilizers to all PP just so they can ship it to customers without it degrading during shipment.

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Speed to Market Over Safety

There is no requirement to prove the service life of an implanted medical device. Medical device manufacturers claim rigorous testing and approval — but because no service life studies have been conducted, patients often end up needing surgery to remove the failing device.

SEM comparison of PP mesh fiber degradation over time from implantation to 6 years showing progressive embrittlement

  • Implantation
    Antioxidant additives begin to be extracted by body fluids

  • Months
    Fibers turn brittle as antioxidant protection is depleted

  • 1–3 Years
    Mesh fragments into small pieces embedded in organs

  • Revision Surgery
    Difficult removal — fragments ingrown into tissue cause organ damage

FDA 510(k) & Regulatory Failures

How flawed regulatory pathways allowed dangerous materials into patients' bodies.

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The 510(k) Red Flag

PP sutures were used as the predicate device argument. The problem: sutures are used for weeks — mesh implants are meant for years. The FDA accepted this flawed substantial equivalence argument.

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Biocompatibility Gaps

"Biocompatible" simply means the plastic doesn't cause inflammation or infection at implantation. It does not address long-term degradation. Inflammation doesn't occur until after the mesh degrades and breaks into pieces — months later.

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Supply Chain Fraud

A large medical device company switched from a US supplier to a Chinese supplier — then repackaged the Chinese plastic to cover up the switch. This was done to save time and money, without re-testing the device.

Large-Scale Litigation Support

Mass Tort & MDL Support

Proven capability to handle large-scale medical device litigation with scientific rigor.

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MDL Coordination

When serving as an expert in class action and MDL litigations, it is critical to focus only on the science of the plastic and not wander outside your area of expertise. We recommend retaining complementary experts — regulatory compliance, biocompatibility — while we focus on plastic/polymer degradation science.

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Representative Sampling

In mass tort litigation, you must prove that failures are widespread and systemic — not limited to isolated cases. This requires analysis of a statistically significant number of samples. Our laboratory is equipped to process high-volume sample analysis with scientifically proven and accepted methodology.

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Bellwether Trial Strategy

We use the KIS (Keep It Simple) principle. We take complex material failures and make them so simple that a jury can clearly see the manufacturer's negligence. Simple demonstrations and analogies explain highly technical issues so any layperson can understand.

Representative Cases

A selection from our 198+ plastic failure litigation cases.

Mesh 

PP Mesh Implant — CBS 60 Minutes Investigation

Polypropylene (PP)

Forensic analysis proved PP mesh degrades inside the human body as antioxidant additives are depleted. Mesh turns brittle, fragments, and ingrows into organs. Featured on CBS 60 Minutes, contributing to national awareness and regulatory scrutiny.

Surgical 

Adhesive Allergy — Surgeon Negligence

Surgical Adhesive

Patient listed an adhesive allergy. Surgeon ignored this information and closed surgery using adhesive rather than suture. Patient developed severe infection at the surgical site requiring multiple corrective surgeries.

Instrument 

Catheter Failure — Manufacturer Exonerated

Medical-Grade Plastic

SEM analysis of the broken catheter proved it had been accidentally cut using scissors — not a manufacturing defect. This discovery allowed the manufacturer to be excluded from the case.

Manufacturing 

Supply Chain Fraud — Material Substitution

Medical-Grade Plastic

Large medical device company switched from a US supplier to a Chinese supplier, then repackaged the Chinese plastic to cover up the switch. The substitution was done because the original US supplier ceased supply. Rather than spend time and money to requalify a new resin supplier, the mesh manufacturer repackaged the Chinese resin and covered up the resin change leading to litigation.

Have a medical device case?

Attorney's Checklist

Medical Device Deposition Guide

Essential guidance for attorneys handling medical device litigation.

 Published Research & Credentials

Peer-reviewed scientific publications that form the foundation of our expert testimony.

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Florian Koschitski and Duane Priddy, "Uncovering the Cause of the Unique Failure of Color Coated PEXa Pipe," Society of Plastic Engineers ANTEC Proceedings, 2025.

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Florian Koschitski and Duane Priddy, "CPVC Pipe Failure by Environmental Stress Cracking Without Exposure to Foreign Chemicals," Society of Plastic Engineers ANTEC Proceedings, 2024.

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Duane Priddy, "Causes of Failure & Remediation Options for Failing CPVC Fire Sprinkler Piping Systems," NFPA Technical Conference, Boston, 2017.

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Duane Priddy, Rowland Hall, Dan Beaudoin, "Selecting the Best Remediation Option for Failing CPVC Piping Systems," SPE/PPD ANTEC Proceedings, 2016.

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Duane Priddy, "Why do PVC & CPVC pipes occasionally fail?" Popular Plastics & Packaging, 60(8), 29-37, 2015.

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Duane Priddy, "Understanding the Science Behind Burst Resistant Exercise Balls and Why Some Burst During Use," Material Science & Technology, 2015.

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Duane Priddy, "Forensic Analysis of CPVC Fire Sprinkler Piping," Subrogator, Spring/Summer 2012.

Medical Device Litigation FAQ

Common questions from attorneys handling medical device and mass tort cases.

Request a Confidential Medical Device Case Evaluation

Tell us about your medical device case. Our experts typically respond within 24 hours with an initial assessment of the device failure and recommend next steps.

24-Hour Response
Confidential initial case assessment within one business day.

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+1 (989) 281-4465

 

 Watch the CBS Interview
View the 60 Minutes feature