Clinically relevant in vitro cardiovascular simulators

Demo of an in vitro simulation unit

The new era of medical device design and development

The photo above shows a demo of an in vitro simulation unit for patient-specific abdominal aortic aneurysm (AAA) and silicone AAA models display.

Cardiovascular simulators – what is being simulated?

The adoption of in vitro cardiovascular simulators by the medical device industry is driving current and future innovation. Companies now have access to customised in vitro simulation technologies that help to replicate highly complex cardiovascular scenarios such as stroke, coronary disease and aneurysm. Each of the customised in vitro simulators developed by MET provides the anatomical challenges that a medical device has to overcome during its clinical use.

Cardiovascular simulators – their customisation

MET researchers work with the digital medical data provided by the latest Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) scanning technology. The clinical aspects are accurately extracted from the medical data and translated into engineering data by our dedicated team of specialists. The results are customised virtual models, on their true scale and clinical complexity. The virtual data are fed into the design and fabrication processes of the clinical relevant anatomical physical models. The customised models could be used as stand-alone in vitro setups for device testing or as integrated parts of a customised in vitro cardiovascular simulator.

How do cardiovascular simulators benefit medical device development?

MET cardiovascular simulators provide non-clinical engineering testing services as recommended by the FDA such as delivery, deployment and retraction, pushability, flexibility and kink test, accuracy of deployment, vessel anchoring force before slippage, migration, ease of preparation, ease of introduction and radiopacity. MET in vitro models mimic customised challenging in vivo tortuous anatomy, vessel wall friction and mechanical behaviour, which a device has to overcome in clinical use. The in vivo physiologic and anatomic conditions are fully mimicked by our customised in vitro simulators which are validated by clinicians associated with the centre.

Example of in vitro simulators technologies informing medical device design

The Abdominal Aortic Aneurysm (AAA) simulation unit is one of MET’s customised in vitro cardiovascular simulators, which was validated to offer multiple testing options for industry such as:

  • Fluoroscope compatibility for delivery, deployment and retraction of bifurcated stent-grafts, balloon catheters for aortic occlusion and optimisation of deployment techniques to avoid stent kinking.
Stented AAA flexible model in-vitro fixture and C-arm

Stented AAA flexible model in vitro fixture and C-arm

Deployment test of two different stent-grafts under fluoroscopy

Deployment test of two different stent-grafts under fluoroscopy (A and B). Resulted kinking during testing (C).

  • Ultrasonic colour Doppler imaging for deployment device resulted configuration and device impact on the blood flow.
Colour-Doppler flow visualisation within the AAA stented model Longitudinal transducer setup

Colour-Doppler flow visualisation within the AAA stented model. Longitudinal transducer setup, (T = Top, B = Bottom, R = Right, L = Left).

Color-Doppler ultrasound flow visualisation for 3 cross-sectional planes

Colour-Doppler ultrasound flow visualisation for 3 cross-sectional planes for the migrated stent-graft device, within the AAA model, (1) Section before the kinked region, (2) Section through the kinked region, (3) Section before the iliac bifurcation, (A = Anterior, P = Posterior, R = Right, L = Left).

The blood is replicated by a blood-mimicking fluid prepared in-house, which accurately replicates the viscosity and density of the blood. The fluid is circulated through the in vitro fixture by a versatile, programmable BDC PD-1100 pump system accompanied by the StatysPD control and monitoring software. The pump system can achieve physiological hemodynamic simulation within in vitro cardiovascular flow networks, where the PD-1100 acts as a pumping heart. With the PD-1100 and the appropriate components, the local hemodynamics of the heart or any vascular bed can be simulated. Typical applications include: cardiac valve evaluation and vascular studies of aortic, peripheral, carotid, femoral, venous, and pulmonary flow networks.

Project Benefits

MET Technology Gateway manages projects with a customer focus to achieve traceable, reproducible and cost effective outputs. MET was able to provide the customer clinically relevant data informing the performance of the device and comparing data measured within the same system from commercially available devices.

About the author

Eugene McCarthy MET GMIT Technology Gateway

Eugene McCarthy

MET Technology Gateway Manager

091 742 329