Accurate peripheral resistance simulation in a mock circulatory loop is critical to the evaluation of ventricular assist devices and heart valves. Implementation of an automated device that is capable of accurate resistance settings and precise reproduction of cardiovascular parameters allows for improved construction of experimental conditions within a mock circulatory loop. A mock circulatory loop resistor that employs a proportional valve design is proposed; a piston extending into the flow path to produce a resistance to flow. Real-time position feedback of the piston is used to determine orifice size, providing resolution in the change of resistance over time. Characterization of the physical system with The MathWorks SIMULINK™ SIMSCAPE™ block set allowed the determination of objective device parameters; the discharge coefficient and critical Reynolds number. The determination of these values was achieved utilizing the SIMULINK™ Parameter Estimation™ tool, experimental data, and a computational plant model of the experimental setup. With this information, an accurate computational model of the resistance device is presented for use in determining resistance settings in silico prior to implementation in the mock circulatory loop. Experimental in vitro trials verified the repeatability of the automated resistor performance by means of a staircase testing of piston position during several different continuous flow rates of a glycerin/water solution.
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December 2012
Research-Article
Implementation of an Automated Peripheral Resistance Device in a Mock Circulatory Loop With Characterization of Performance Values Using Simulink Simscape and Parameter Estimation
Charles E. Taylor,
Charles E. Taylor
Department of Biomedical Engineering,
401 West Main Street RM1229,
Richmond, VA 23220
e-mail: taylorce@mymail.vcu.edu
Virginia Commonwealth University
,401 West Main Street RM1229,
Richmond, VA 23220
e-mail: taylorce@mymail.vcu.edu
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Gerald E. Miller
Gerald E. Miller
Department of Biomedical Engineering,
401 West Main Street RM1229,
Richmond, VA 23220
e-mail: gemiller@vcu.edu
Virginia Commonwealth University
,401 West Main Street RM1229,
Richmond, VA 23220
e-mail: gemiller@vcu.edu
Search for other works by this author on:
Charles E. Taylor
Department of Biomedical Engineering,
401 West Main Street RM1229,
Richmond, VA 23220
e-mail: taylorce@mymail.vcu.edu
Virginia Commonwealth University
,401 West Main Street RM1229,
Richmond, VA 23220
e-mail: taylorce@mymail.vcu.edu
Gerald E. Miller
Department of Biomedical Engineering,
401 West Main Street RM1229,
Richmond, VA 23220
e-mail: gemiller@vcu.edu
Virginia Commonwealth University
,401 West Main Street RM1229,
Richmond, VA 23220
e-mail: gemiller@vcu.edu
Manuscript received January 6, 2012; final manuscript received August 7, 2012; published online October 11, 2012. Assoc. Editor: Paul A. Iaizzo.
J. Med. Devices. Dec 2012, 6(4): 045001 (7 pages)
Published Online: October 11, 2012
Article history
Received:
January 6, 2012
Revision Received:
August 7, 2012
Citation
Taylor, C. E., and Miller, G. E. (October 11, 2012). "Implementation of an Automated Peripheral Resistance Device in a Mock Circulatory Loop With Characterization of Performance Values Using Simulink Simscape and Parameter Estimation." ASME. J. Med. Devices. December 2012; 6(4): 045001. https://doi.org/10.1115/1.4007458
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