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PubMed · 10257192

A proposed computer-assisted preventive maintenance system.

S Veluchamy
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Abstract

This paper describes a proposed Computerized Documentation System for effectively controlling all biomedical equipment preventive maintenance (PM) and repair functions to be effected by hospitals. There is a critical need for such a system to strengthen the management tools of hospital-based Biomedical/Clinical Engineering programs. The system's design objectives, implementation, and evaluation method are explained and the benefits attributable to such a computerized control system are summarized.

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Biomedical EngineeringComputersHospital Bed Capacity, 500 and overMaintenance and Engineering, HospitalOhioRisk ManagementJournal Article

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S Veluchamy. A proposed computer-assisted preventive maintenance system.. https://doi.org/10.1097/00004669-198207000-00014

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The present paper addresses the numerical optimization of geometrical parameters of non-Newtonian micro-scale viscous pumps for biomedical devices. The objective is to maximize the mass flow rate per unit of shaft power consumed by the rotor when an external pressure load is applied along the channel that houses the rotor. Two geometric parameters are considered in the optimization process: (i) the height of the channel that houses the rotor (H) and (ii), the eccentricity (epsilon) of the rotor. Three different micro-scale viscous pump configurations were tested: a straight-housed pump (I-shaped housing) and two curved housed pumps (L- and U-shaped housings). The stress-strain constitutive law is modeled by a power-law relation. The results show that the geometric optimization of micro-scale viscous pumps is critical since the mass flow rate propelled by the rotor is highly dependent on epsilon and H. Numerical simulations indicate that mass flow rate is maximized when epsilon approximately 0, namely when the rotor is placed at a distance of 0.05 radii from the lower wall. The results also show that micro-scale viscous pumps with curved housing provide higher mass flow rate per unit of shaft power consumed when compared with straight-housed pumps. The results are presented in terms optimized dimensions of all three configurations (i.e., H(opt) and epsilon(opt)) and for values of the power-law index varying between 0.5 (shear thinning fluids) and 1.5 (shear-thickening fluids).

Biomedical Engineering↗