Lung simulators are widely used to test ventilators, respiratory devices, and therapies under controlled conditions. But how accurately do these devices reproduce the behavior of human lungs?

A new peer-reviewed study published in the Journal of Biomechanics examined that question by comparing four lung simulators, including the Michigan Instruments TTL®, under healthy, restrictive, and obstructive lung conditions. The research provides useful insight into what simulator accuracy means and why dynamic performance matters in ventilator testing.

What Is Dynamic Accuracy?

Lung simulator accuracy is about more than whether a device reaches a specific compliance or resistance setting. A simulator also needs to respond appropriately as airflow and other conditions change.

Dynamic accuracy describes how closely a simulator’s pressure and flow response matches the expected behavior of a lung model as conditions change. This is important when testing ventilators because respiratory devices interact with changing lung mechanics rather than a completely static load.

The study evaluated simulator responses across different flow frequencies and amplitudes, comparing their behavior against a theoretical single-compartment lung model.

How the Study Evaluated Lung Simulators

Researchers compared four commercially available simulators:

  • ASL5000
  • Alveo
  • SmartLung 2000
  • Michigan Instruments TTL®

The simulators were tested using healthy, restrictive, and obstructive lung configurations. Researchers analyzed pressure and flow responses across different frequencies and amplitudes to evaluate how closely each simulator matched the reference lung model.

This is important because lung simulators can behave differently depending on their mechanical design, resistance characteristics, and the conditions being simulated.

What the Study Found About the TTL®

The study found that the passive TTL® showed consistent behavior across the frequency range evaluated. For healthy and restrictive configurations, its response remained close to the reference model through much of the tested range.

The researchers also identified flow-amplitude dependence when the TTL® was configured to simulate obstructive conditions. This behavior was associated with its parabolic resistance characteristics.

Importantly, the study did not conclude that one simulator is universally the most accurate. Instead, the findings highlight the importance of understanding simulator-specific characteristics when designing bench tests and interpreting results.

Why Lung Condition Matters

The research demonstrates why testing a simulator under only one condition may not provide the complete picture.

Healthy, restrictive, and obstructive lungs have different mechanical characteristics. A simulator may respond differently depending on compliance, resistance, airflow, and frequency.

Michigan Instruments TTL® systems provide adjustable compliance and airway resistance, allowing users to create a range of simulated lung conditions. Their mechanical design provides a dynamic response to mechanical ventilation.

What This Means for Ventilator Testing

For engineers, researchers, and medical device manufacturers, the study reinforces an important point: the testing load matters.

A ventilator may perform differently when exposed to different lung mechanics. Using a realistic, well-characterized simulator allows teams to evaluate device performance under controlled conditions and better understand how equipment responds to changing respiratory loads.

Michigan Instruments lung simulators support ventilator testing, calibration, research, and device development. TTL® systems provide adjustable compliance and resistance, while PneuView® systems add real-time pressure, flow, and volume monitoring, along with data recording and analysis.

Accuracy Is About the Entire Testing Setup

The research shows that simulator accuracy cannot always be reduced to a single specification. Teams should consider how a simulator behaves under the specific conditions being tested.

For bench testing, that means considering the lung model, compliance and resistance settings, flow characteristics, measurement equipment, and testing protocol together.

A well-designed testing environment produces more meaningful results and helps teams understand how a ventilator or respiratory device performs under different simulated patient conditions.

Supporting More Reliable Respiratory Testing

As ventilator technology continues to evolve, realistic lung simulation remains an important part of device testing and development. Research like this provides a better understanding of the mechanical characteristics that can influence testing results.

Michigan Instruments provides lung simulation tools for teams that need realistic, repeatable respiratory mechanics. From TTL® Training Test Lungs to PneuView® systems, our solutions support ventilator testing, research, development, and respiratory education.

Contact Michigan Instruments to learn how our lung simulators can support your testing and research applications.

Research referenced: Ferencz M, Drath R, Dömer B. Dynamic accuracy of lung simulation hardware: A comparative evaluation. Journal of Biomechanics. 2026;204:113366.

 

Simulation-based training helps respiratory therapists prepare for complex patient care. Learn how lung simulators recreate realistic respiratory conditions to improve ventilator management skills, clinical confidence, and hands-on education.

Why Simulation Training Is Essential for Respiratory Therapists

Respiratory therapists play a critical role in patient care, helping manage ventilation, support airway function, and monitor patients with a wide range of respiratory conditions. From emergency departments and intensive care units to long-term care facilities, their expertise helps ensure patients receive the respiratory support they need.

Because respiratory conditions can vary significantly from patient to patient, hands-on training is essential. Simulation-based education allows respiratory therapists to gain experience with complex scenarios before they encounter them in clinical settings, helping improve confidence, decision-making, and patient outcomes.

Respiratory Therapists Manage Complex Respiratory Conditions

Respiratory therapists care for patients with conditions that can dramatically affect breathing and ventilator performance. Common examples include:

  • Acute Respiratory Distress Syndrome (ARDS)
  • Asthma and obstructive airway disease
  • Chronic Obstructive Pulmonary Disease (COPD)
  • Restrictive lung disorders
  • Pediatric and neonatal respiratory conditions

Each condition presents unique challenges. Changes in lung compliance, airway resistance, and breathing patterns often require different treatment approaches and ventilator settings. Understanding these differences is a critical part of respiratory therapy education and clinical practice.

Why Traditional Training Has Limitations

Clinical rotations provide valuable real-world experience, but not every learner will encounter the same patient conditions during training. Some respiratory emergencies and complex ventilator scenarios occur infrequently, limiting opportunities for hands-on practice.

Simulation training helps bridge this gap. Educators can recreate specific respiratory conditions in a controlled environment, allowing learners to practice skills repeatedly without patient risk.

This approach also gives instructors the ability to evaluate performance, reinforce best practices, and provide immediate feedback.

How Michigan Instruments Lung Simulators Support Respiratory Therapy Education

Michigan Instruments lung simulators provide a realistic way to demonstrate respiratory mechanics and ventilator behavior. By recreating different patient conditions, educators can help learners better understand how respiratory support strategies affect patient outcomes.

Our Lung simulators allow instructors to adjust compliance and resistance settings to simulate a wide range of respiratory conditions. Learners can observe how ventilators respond to these changes while gaining practical experience with patient assessment, ventilator management, and troubleshooting.

Training scenarios may include:

  • Reduced lung compliance associated with ARDS
  • Increased airway resistance seen in asthma and COPD
  • Adult, pediatric, and infant ventilation
  • Spontaneous breathing interactions with supportive modes of ventilation

These experiences help connect classroom concepts to real-world clinical applications.

Benefits of Simulation-Based Training

Simulation allows respiratory therapy programs to expose learners to a broader range of patient scenarios than they may encounter during traditional clinical training.

Key benefits include:

  • Consistent, repeatable training experiences
  • Improved understanding of respiratory mechanics
  • Greater confidence in ventilator management
  • Enhanced clinical decision-making skills
  • Exposure to complex respiratory conditions
  • Better preparation for patient care environments

By practicing challenging situations repeatedly, learners can develop skills and confidence before working with patients.

Our Solutions for Respiratory Training

Michigan Instruments provides lung simulation solutions designed to support respiratory therapy education and clinical training. With adjustable compliance and resistance settings, educators can recreate a variety of patient conditions and demonstrate how ventilators respond in real-world scenarios.

Solutions such as the TTL® Lung Simulator, Spontaneous Breathing Lung, and PneuView® software help create realistic, repeatable training experiences that build confidence and improve understanding of respiratory mechanics.

Preparing Respiratory Therapists for Real-World Care

Effective respiratory care requires more than classroom instruction. Simulation gives learners the opportunity to practice ventilator management, troubleshooting challenges, and gain experience with complex respiratory conditions in a safe environment.

Michigan Instruments lung simulators help educators deliver hands-on training that prepares respiratory therapists for the demands of patient care while supporting stronger clinical outcomes.

Discover how Michigan Instruments lung simulators can help prepare respiratory therapists for the challenges of real-world patient care.

Simulating Difficult Airway and Lung Conditions in Training Environments

Healthcare professionals must be prepared for a wide range of respiratory conditions, many of which are difficult to encounter consistently during clinical training. Conditions such as ARDS, severe asthma, restrictive lung disease, and pediatric respiratory disorders all affect ventilation differently and require specialized management strategies.

Our lung simulators help educators recreate these complex scenarios in a controlled environment, giving learners hands-on experience with realistic lung mechanics before they encounter patients in clinical settings.

Simulating ARDS and Low Compliance Conditions

Acute Respiratory Distress Syndrome (ARDS) presents significant challenges for respiratory care teams. Reduced lung compliance can make ventilation more difficult and increase the importance of proper ventilator settings.

Using adjustable lung simulators, educators can replicate the stiff lung characteristics associated with ARDS and demonstrate how changes in compliance affect airway pressures, tidal volumes, and ventilator performance. Learners can practice lung-protective ventilation strategies while gaining a better understanding of patient response under realistic conditions.

Training for Asthma and Obstructive Airway Disease

Obstructive conditions such as asthma increase airway resistance and can create ventilation challenges that differ significantly from restrictive disorders.

By adjusting resistance settings, educators can simulate bronchoconstriction and airflow limitation, allowing learners to observe ventilator behavior and alarm responses. These scenarios help clinicians understand the effects of increased resistance and practice making appropriate ventilator adjustments.

Recreating Restrictive and Pediatric Respiratory Conditions

Restrictive lung diseases reduce lung expansion and require a different approach to respiratory support. Lung simulators allow instructors to demonstrate how decreased compliance affects ventilation and patient management.

Educators can also recreate pediatric and infant respiratory conditions using age-appropriate simulation models. This gives learners valuable experience with smaller lung volumes, different breathing patterns, and patient populations they may encounter less frequently in practice.

Tools Designed for Respiratory Education

Michigan Instruments lung simulators provide educators with the flexibility needed to create a variety of respiratory training scenarios.

Key capabilities include:

  • Adjustable compliance and resistance settings
  • Adult, pediatric, and infant simulation options
  • Single and dual-lung configurations
  • Real-time visual feedback
  • Digital monitoring and analysis with PneuView®
  • Spontaneous breathing simulation capabilities

These features allow instructors to create repeatable training experiences while helping learners connect respiratory theory with practical application.

Better Training Through Realistic Simulation

Simulation-based education gives clinicians the opportunity to develop skills and confidence before treating patients. By recreating conditions such as ARDS, asthma, restrictive lung disease, and pediatric respiratory disorders, educators can expose learners to a wider range of scenarios than they may encounter during traditional clinical training.

Our lung simulators provide the realistic, repeatable performance needed to support respiratory education and prepare healthcare professionals for real-world patient care.

Contact us today to learn how our lung simulators can support your respiratory training and simulation programs.

Accurate ventilator testing is essential. In research and development, biomedical labs and ventilator management. Even the smallest errors can have significant consequences. Inconsistent calibration, missed alarm checks, or using unrealistic patient simulations can all compromise outcomes and patient safety.

Michigan Instruments lung simulators give teams the tools they need to test ventilators under realistic, repeatable conditions. They help identify problems early, ensuring devices perform reliably before reaching patients.

Why Ventilator Testing Errors Happen

Even experienced engineers and technicians encounter common pitfalls during testing. These include:

  • Skipping routine recalibration: Ventilators can drift over time, and without regular testing, performance may fall outside manufacturer specifications.
  • Misreading ventilator waveforms: Understanding how settings affect delivered pressure, volume, and flow requires realistic patient simulation.
  • Using static or unrealistic test lungs: Lungs that do not behave like real patients can mask issues in compliance, resistance, or alarm function.
  • Incomplete documentation: Without consistent records, it is difficult to track trends or spot recurring problems.

Each mistake can lead to inaccurate assessments, unrecognized device issues, and delays in both development and clinical deployment.

How Lung Simulators Help Prevent Mistakes

Michigan Instruments lung simulators replicate real lung mechanics, giving engineers reliable feedback during testing. They provide:

  • Adjustable compliance and resistance to recreate a wide range of patient conditions, from healthy lungs to ARDS or obstructive disease. This ensures ventilators are evaluated under realistic scenarios.
  • Built-in monitoring and feedback with volume scales, pressure gauges, and multiple ports to capture performance in real time.
  • Digital data recording with PneuView® to analyze, record, and replay tests. This allows teams to verify alarms, waveforms, and device behavior across repeated trials.
  • Consistent, repeatable results so every test is reliable and comparable over time.

With realistic and measurable feedback, lung simulators help teams catch errors before they become problems.

Applications for R&D and Biomedical Teams

Biomedical engineering teams rely on lung simulators to validate ventilator performance after repairs, routine maintenance, or quality checks. By testing alarms, pressure limits, and delivered volumes under realistic conditions, engineers can ensure devices meet manufacturer specifications before reaching patients.

Device development and research also benefit from lung simulators that recreate realistic patient loads. Engineers can evaluate prototypes, verify safety and regulatory compliance, and generate accurate documentation for internal review or submission, all with confidence that results reflect true clinical conditions.

Simulators also support training and knowledge transfer within teams. Seeing ventilators respond in real time allows staff to understand device behavior more deeply, reducing errors and promoting consistent performance across shifts and departments.

Features Designed for Real-World Testing

Michigan Instruments TTL®, Spontaneous Breathing and PneuView® lung simulators combine durability, flexibility, and precision to meet the needs of high-demand testing environments.

These features reduce errors, streamline testing workflows, and give engineers confidence that ventilators will perform safely in clinical settings.

Reduce Errors and Increase Confidence

Mistakes in ventilator testing can be costly, but they are avoidable. Michigan Instruments lung simulators provide the realistic, repeatable performance that R&D labs and biomedical teams need. They help ensure ventilators are tested thoroughly, calibrated correctly, and validated with confidence.

Contact us today to learn how our lung simulators can support your ventilator testing program and help your team prevent errors before they happen.

Ventilator testing and calibration use lung simulators to verify tidal volume, pressure limits, alarms, and waveform performance under realistic patient conditions. By simulating lung resistance and compliance, biomedical and respiratory teams can confirm ventilators deliver accurate, repeatable performance for safe clinical use.

Lung simulators play a critical role in modern ventilator training for respiratory therapy programs. By allowing educators to adjust compliance and resistance, simulators help students connect ventilator settings to real lung behavior, building confidence, clinical judgment, and hands-on experience before entering patient care.

Respiratory emergencies like ARDS and COPD evolve quickly, demanding rapid clinical judgment and adaptability. Dynamic lung simulation allows educators and care teams to train for changing compliance, resistance, and disease progression—building the confidence and problem-solving skills needed when real patients don’t follow a script.

In medical training, precision matters—but so does endurance. Simulation tools need to perform accurately today, tomorrow, and for years to come. When they don’t, programs stall, lessons lose impact, and confidence fades.That’s why durability is at the heart of every simulator we build at Michigan Instruments.

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