Instrument Testing and Validation
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Transcript of Instrument Testing and Validation
Testing and Validation of Disposable / Single-
Procedure Surgical Instruments & Procedural Kits
By James B. Schultz
Executive Vice President1
Disposables in the O.R.– The Way of the Future
Advent of single-procedure torque-limiting, fixed
driver and related instruments and procedural kits
offers viable substitute or alternative today
Clinical and economic value realized
Pristine instrument set for every surgery
Perfect instrument calibration
Eliminate re-processing costs/hassles
Annuity revenue potential
Customized products tailored to OEM specifications
Applied across all ortho implants—both new and
legacy product lines
Embraced by major ortho/spine OEMs
A value add solution for ASCs with high volume,
low complexity procedures and emerging markets
instrumentation
23M surgeries per year at ASCs and over 18% are
ortho/spine
2
Disposable instrument and sterile-pack kit adoption
3
Products Indication
Spine
Extremity
Trauma
Sterile-Packed Surgery Ready Instruments & Kits
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ECA’s Product Design & Development
Engineering Stage Book/Step Process
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Sterile-Packed Instrument Kit Testing & Validations
Example of a 100% Disposable Sterile-Packed Procedural Kit Testing & Validations
ECA’s Intelligent Implant Systems Revolution® Spinal Implant Kit
FDA-approved complete spinal implant instrumentation kit that is 100% disposable
Reduced 4 trays and 40 instruments to 11 instruments in one sterile-pack tray for single & 2 level fusions
Instrument EVT and DVT testing Packaging, Transportation, Aging and Bio/Cyto Validations
Listed with FDA
CE Mark ready
Product in market since Sept 2015 with scores of successful surgeries
Pedicle
Probe
Bi-directional
cannulated ratchet
Torque Limiter
Offset T-Handle
Counter
Torque Shaft
Template
Compression
Distraction Shaft
Fixed Driver
T-Handle
Introducer
SounderBone Awl
Nut Driver
Shaft
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Key Reliability and Validation Tests
Design verification
Engineering Validation Test (EVT) and Design Verification Test
(DVT) stages of development, proto builds, pilot runs, vendor
selection, BOM freeze
Design validation
Validate production equivalency, customer V&V testing
Packaging validation
Sterile Barrier Systems (SBS) baseline (tray/lid) includes bubble, peel
testing
Distribution testing
Distribution to ISTA 2 standard
Sterilization validation
Validate to SAL 10-6 with gamma, ISO standard compliance
Assembled in ISO Class 7 cleanroom
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Key Reliability and Validation Tests
Biocompatibility testing
FTIR, LAL and TOC
Corrosion resistance testing for stainless steel components
Citric or nitric passivation and immersion testing
Aging of packaging and instrumentation
2 year or more shelf life for packaging and instruments
NPI production hand-off
cGMP mass production implemented
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Design & Development Process Includes
Simulation, Automated and Manual Testing
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FEA testing
Manual Torque testing
Shaft/driver Torsion testingAutomated Torque testing
Summary
Disposable instruments and procedural kits
undergo comprehensive PD process to meet
quality and regulatory / compliance requirements
Clinical robustness
DFMEA, PFMEA
Product Development Stage Gates
Design Inputs & Outputs
Validation and Verification testing
Full validations/reports & documentation (aging,
bio/cyto, packaging, sterilization, transportation,
labels, cleaning process, etc.)
OEM Checklists
NPI and cGMP process / handoffs
Pilot production
Manufacturer of Record, Traceability
Pristine instrument or procedural kit for every
surgery and patient
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CONFIDENTIAL ECA MEDICAL INSTRUMENTS 11
ECA Medical Instruments
Corporate Headquarters
2193 Anchor Court
Thousand Oaks, CA 91320 USA
Tel: +1 (805) 376-2509
Fax: +1 (805) 376-2189
www.ecamedical.com
Thank You!
Instrument Testing and Validation Session
Clinical Re-Processing Cycles
June 15, 2016 David M. Blakemore
BoneSim Laboratories
BoneSim Laboratories~~~TM
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Agenda: • What is Clinical Re-processing • Why is it important • How does it affect us • How do we respond
BoneSim Laboratories~~~TM
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Definition • Moving a surgical instrument from patient to patient.
BoneSim Laboratories~~~TM
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Definition • Moving a surgical instrument from patient to patient.
• Identification and preparation
• Surgical Use
• Cleaning and Sterilization
• Storage
BoneSim Laboratories~~~TM
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC) •Instruments are Identified, Inspected, Functionally checked and placed on OR/Mayo stand •FDA calls this the Point Of Use Processing
BoneSim Laboratories~~~TM
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC)
BoneSim Laboratories~~~TM
• Point of use The next speakers will cover much of the this subject but suffice it to say that it is put thru its paces. • Surgical intervention • Mechanical loading, bending, torque, axial, etc. • Exposure to blood, lipids, fats, etc. • Then placement in saline or enzyme solution
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC) SPD processing (Sterile Processing Department)
BoneSim Laboratories~~~TM
•Rinsing •Cleaning - manual
Detergent or Enzymatic detergent with manual brushing and removal of debris
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC) SPD processing (Sterile Processing Department)
BoneSim Laboratories~~~TM
•Cleaning - Ultrasonic
Detergent or Enzymatic detergent with high energy cavitation ambient or elevated temperatures
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC
BoneSim Laboratories~~~TM
•Cleaning/disinfecting - automatic
Rinse, enzymatic soak, detergent wash, rinse, heated dry
Hospital SPDs use longest, highest temp. cycles when IFU is unclear, not available or considered not to be to their standard.
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC)
BoneSim Laboratories~~~TM
•Terminal Sterilization autoclave, chemical, ETO, etc.
Focusing on steam sterilization
Hospital SPDs use longest, highest temp. cycles when IFU is unclear, not available or considered not to be to their standard.
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC) - Why is it important to us
BoneSim Laboratories~~~TM
Material Selection
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC) - Why is it important to us
BoneSim Laboratories~~~TM
Processing Instructions i.e., etching, material choice, passivation and passive layer compromise
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing - FDA
BoneSim Laboratories~~~TM
Longevity of efficacy and sterility guarantee.
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing - FDA
BoneSim Laboratories~~~TM
What’s New in the 2015 Final Guidance(vs the 1996 Guidance) Expanded to include information pertaining to validation of reprocessing methods and instructions
• Specific emphasis on importance of proper cleaning & cleaning validation, IMPORTANCE OF WORST-CASE TESTING, importance of device designs that are less challenging to reprocess
• Human factors considerations when validating reprocessing methods and instructions
• Provides greater clarity on documentation to be provided in the different premarket submissions: 510(k), PMA, de novo, HDE, IDE
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing - FDA Guidance Document
BoneSim Laboratories~~~TM
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing – How do we respond?
BoneSim Laboratories~~~TM
• Rely on clinically relevant data • Careful material selection • Best design practices • Test Data
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing
BoneSim Laboratories~~~TM
Let’s look at potential costs and time. 5 Year lifecycle test (500 CRC only)
Point of Use cycling $30/ea
Washer/disinfector cycling $85/ea Autoclave cycling $130/ea $245 x 500 = $122,500.00 2-3 cycles per day shift, 5 days per week, blue sky…. 34 weeks for one design…….
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing - Why is it important to us
BoneSim Laboratories~~~TM
Let’s look at potential costs and time.
$122,500.00 cost and 34 weeks for one design……. This needs to be changed by a factor of 4/5 to make it feasible for companies and projects to move forward $25-35K and 8 weeks is more palatable, bundling projects/device designs also makes sense 100 cycle iterations brings it to <$10K and 1.5 weeks
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC)
BoneSim Laboratories~~~TM
Two Choices: • Run CRC studies at IFU parameters
• Run CRC studies at worst case known Facility parameters
So what CRC cycles should we run?
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Cycles (CRC)
BoneSim Laboratories~~~TM
Pros •Creates data set at nominal conditions •Allows reporting valid findings •Minimizes risk of over designed components
Run cycles at IFU parameters – pros/cons
Cons •Does not address excursions •Burdens study timeline •May increase cost of study
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles BoneSim Laboratories~~~
TM
Pros •Creates data set at worst case conditions (maybe) •Minimizes risk of failures from facilities over processing •Allows standards to be set for CRC •Reduces cost and timeline
Choose worst case known Facility parameters – pros/cons
Cons •Failures in testing may not be representative of design •Potential over design •May have subjective findings
Clinical Re-processing Cycles (CRC)
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles BoneSim Laboratories~~~
TM
•Create standard(s) to allow high throughput studies - 24/7 lab with large chambers/washers/baths always processing
•Create central database for material and design parameters - Already done at some of the largest OEMs
•Create artificial CRC aging procedures - Comparative data will take time to harvest
What do we do today?
Clinical Re-processing Cycles (CRC) Potential Opportunities
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing – Bonesim Laboratories
BoneSim Laboratories~~~TM
• Soiling, ATS, DBLSO, serums • Pre-soaks, saline, enzyme • Manual cleaning/brushing • Ultrasonics • Automated cleaner/disinfectors • Repeat autoclaves – gravity/prevac • Dry cycles and cool-down • Lube cycles • Tap, RO/DI water rinses • Functional/assembly testing • US and European solutions • Pre/post/iterative photo documentation • Lab Certification and/or
Technical Memorandum
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles BoneSim Laboratories~~~
TM
• 24/5/7 operations • 100 CRC data in 1 week • Functional Testing – Mechanical w/partner Lab • Full Quality System • Immediate response – no waiting
BoneSim Laboratories does not provide sterilization validation; this is to reduce overhead/costs that is passed to the customer
Clinical Re-processing – Bonesim Laboratories
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles BoneSim Laboratories~~~
TM
Thank You
OMTEC 2016 Instrument Testing and Validation Session Clinical Re-Processing Cycles
Clinical Re-processing Definition • But as we move on, we find an abundance of articles addressing biofilm and prions, including the increased risk posed by the breakdown of surgical instruments’ passivation layer, leading to the formation of corrosion and rust, giving way to hidden microbial growth. It’s been well documented that surface corrosion will harbor microorganisms that can be reanimated after sterilization and cause nosocomial (hospital) infections. Ref. http://www.csspdmanager.com/photo6_1.html •As a result, there is no one process that is followed from state to state, let alone hospital to hospital. At annual conferences we hear the complaints over and over again, but keep accepting the fact that we do not follow the same process. The recommendations have been written by AAMI, ANSI, AORN, and OSHA as to what we should be doing, but can be interpreted in many ways •Moreover, there are some that add phosphoric acid rust and stain removers by the gallon to their sonic washers with little understanding as to the damage this causes to the passivation layer on stainless steel surgical instruments. Neither sonic or washer are designed to handle these types of process, let alone the surgical instruments.
BoneSim Laboratories~~~TM
June 15, 2016
Kevin J. Knight
Knight Mechanical Testing
Focus Today: Reusable instruments
Class I devices, no published ASTM/ISO test methods
Surgical instruments that are designed to be cleaned, sterilized, and reused for subsequent surgeries
Typical materials:
Stainless steel:17-4PH, 18-8, 316L, high strength alloys
Durable polymers: PEEK, silicone, Radel®, Delrin
Three categories of instruments generally tested:
Impaction instruments
Torsional drivers
Cutting instruments
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Instruments engineered with impact in mind: Broach/Rasp Handles
Impactors (cup, femoral knee)
Abusive environment Impact forces range from 500lb (placement) to 6000 lb
(seating) intraoperatively
Repetitive assembly/disassembly, cleaning, autoclave
Many points of potential failure Numerous small welds
Springs, detents, u-joints, locking features, screw threads
Etchings, ID, tolerances
MAUDE Database Reported Failures
Broach Handle: “During surgery the broach handle
disengaged. The ball bearing and spring came out. The ball bearing fell into the patient.”
Cup Impactor: “Intraoperatively, the impaction plate broke.”
Femoral Impactor: “The impactor broke during impaction of the femoral trial.”
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Cyclic impact testing
Impact forces based off of literature or bench testing (3000 lb – 6000 lb)
Typical cycle life requirement = 5000 up to 20,000 impact cycles (typical 5 year life)
Impacts interspersed with disassembly, cleaning, and sterilization to simulate use
Post-test NDT (dye penetrant) to inspect for invisible failures
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Impact testing failure examples:
Fracture of the weld connecting the strike plate to the main shaft of hip stem inserter
Example of weld fracture only visible after dye penetrant inspection
T-handle elastic nail inserter – fracture of crossbar
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Two main types: Interface directly with implant
Thread a screw into bone
Apply final tightening torque to a screw or locking component
Drive a cutting instrument
Wide variety of “quick connect” shafts for different cutting instruments
Flexible shafts for reamers and drills
Challenging environment Designed to apply torque, but may also see off axis loading (bending,
axial load)
Could see many fatigue cycles per surgery (drill speeds, 250-750RPM)
Subjected to harsh reprocessing environment (cleaning, autoclave)
MAUDE Database Reported Failures
Screwdriver: “During surgery the tip of the screwdriver
broke off into the screw.”
T-handle: “T handle stripped during surgery and would not lock onto the reamers.”
Reamer Adapter: “It was reported during an unknown patient procedure that the handle broke at the power adapter end while the surgeon was reaming the acetabulum.”
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Repetitive torque testing for screwdrivers and torque setting devices
Special attention paid to wear of tip over time, as well as functionality of screw retention features
Torsional ultimate strength testing for torsional drivers to ensure expected torque load is within linear elastic range
Rotational testing for instruments and adapters driven by powered drills
Internal components effected by repetitive re-processing, liquid intrusion, wear, galling, etc.
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Typical torque test set ups:
Hexalobe driver fracture from cyclic torsional loading
Torque specification life cycle evaluation for continuously rotating “click type” torque limiting T-handle
Simulated use testing for flexible reamer with application of cyclic torque at constant RPM
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Commonly tested for cutting efficiency over time: Drills
Reamers
Harsh environment High torsional loads encountered while cutting hard bone
Possible high temperatures during drilling/reaming
Repetitive cleaning and autoclave
Two potential failure modes Fracture from unexpectedly high torque
Dulling over time
MAUDE Database Reported Failures
Drill Bit: “During the procedure, the drill bit fractured in the
patient and all the pieces could not be retrieved.”
Dull drills and reamers may not be reported as failures, but could be more damaging to the patient: Prone to skiving - leading to inaccurate cuts, poor implant
placement, damage to surrounding tissue
More axial force leads to uncontrolled breakthrough
Creates excessive heat that kills bone (necrosis)
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Testing consists of repetitive cutting cycles in bone analog
Appropriate bone analog should be chosen:
Bovine or porcine bone is often used to get an close approximation of actual cutting forces encountered, but is not appropriate for high volume testing
Sawbones foam – most commonly used, readily available and relatively inexpensive. Variety of densities to roughly approximate differing types and quality of bone but with polymer (local melting) limitations.
BoneSim bone analog – Expensive, but better approximation of cortical and cancellous bone properties, and more amenable to high volume testing than animal bone
Cutting efficiency can be characterized with axial force, torsional load, and/or resulting feed rate
Can be evaluated prior to and following repetitive cutting cycles, or monitored continuously
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Typical cutting efficiency set ups:
Drill bit efficiency test – torque and axial force monitored continuously
Cyclic tibial post drill evaluation - cutting efficiency and fixture/drill galling
Cyclic reamer efficiency test – torque and axial force monitored continuously
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