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Development of Smart Patient-Specific 3D Printed Vascular Phantoms for Assessment of Flow Dynamics and Treatment Simulations Using Embedded Sensors
Başlık:
Development of Smart Patient-Specific 3D Printed Vascular Phantoms for Assessment of Flow Dynamics and Treatment Simulations Using Embedded Sensors
Yazar:
Karkhanis, Nitant Vivek, author.
ISBN:
9780438049178
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (95 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Ciprian N. Ionita Committee members: Albert H. Titus.
Özet:
Cardiovascular Diseases (CVD) being the leading cause of death, investigating various methods for understanding the effects of these diseases is of utmost importance. Hemodynamic parameters such as blood pressure and flow rate are the first once affected by CVD. There have been various methods developed to study the flow dynamics using Computational Fluid Dynamics (CFD) which are computationally intensive and also uses unrealistic boundary conditions such as rigid vessel wall. This thesis focus on the developing methods combining 3D printing of patient-specific phantoms and sensors for measuring the mechanical parameters of flow in real-time and overcoming the pitfalls of CFD.
The method of Lumped Parameter Model was used to verify the behavior of 3D printed idealized single vessel phantom as an RC circuit. In order to measure the flow parameters, pressure and flow sensors were used in conjunction with LabVIEW. An oscillatory flow (sine) with a flow rate of 350mL/min was used and LabVIEW recorded the recorded pressure and flow for different frequencies of flow wave in real-time using NI ELVIS II+ as a data acquisition system. Later the pressure and flow data were processed and the phase difference between pressure and flow, resistance and reactance were estimated. It was observed phase difference and reactance decreased with frequency, which showed that a compliant vessel behaves as a parallel RC circuit.
We developed Smart Patient-Specific vascular models to provide a 3D display of pressure gradients on patient-specific coronary vascular geometries by combining 3D printed phantoms with pressure sensors. The coronary models printed include the three main coronary arteries and the aortic root. The pressure sensors were connected to these four locations and the data was acquired using NI ELVIS II+. A LabVIEW code was developed to measure the pressures at each vessel, calculate the Fractional Flow Reserve (FFR) for selected coronary vessel and display a 3D of a color-coded map of pressure for better visualization.
For treatment of vascular diseases, new endovascular devices are emerging constantly allowing the physicians to treat with minimum invasion. There is a need for a system to measure the parameters (Force and Torque) of navigating a device through the vessels and provide a real-time feedback helping in the assessment of the devices. A system was developed to track the force and torque as guidewire was navigated through a patient-specific neurovascular phantom under fluoroscopy. A Six-Axis F/T sensor from ATI Automation Industries was used to measure force and torque in all six Cartesian axes in real-time. This system recorded the forces for three guidewires with varying tip stiffness. This study can be used for device testing and validation of emerging endovascular devices against existing devices. The study of force and torque showed that the guidewires differ in stiffness. Understanding the stiffness is important because the stiff guidewires are harder to navigate through the tortuous vessel and flexible tip guidewires provide an easy way of navigation. Hence, the tool developed could assist in assessing the stiffness of guidewire by recording the force and torque required to manipulate the device.
Notlar:
School code: 0656
Tüzel Kişi Ek Girişi:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(694054.1) | 694054-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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