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PubMed · 8275141

Using laptop computers as a BMET field service tool.

Abstract

This system has been in operation for approximately two years at the time of this writing, and involves more than a dozen laptop computers. The true test of whether something is successful is the degree of acceptance that is generated by the people who must use it. Approximately two months after beginning this process, our biomedical equipment technicians (BMETs) asked us to expand utilization of this system to a greater segment of our client base because it was so much simpler than our prior paper method. Our ability to track events that occur in the field is much improved with any problems identified in procedures being communicated through the private comments. Not only are the printed PM forms far more legible than the prior hand-entered results, but the concept of test-to-standards now is far more practical because the testing protocols are a keypress away, and the question of whether the technician would take the time to look up in the cumbersome procedure manuals those things that he or she was only slightly unsure of is addressed. Additionally, we have seen more than a 25% reduction in data-handling associated with the processing of the PM inspections in this fashion. Even with the time necessary to create the data disks, upload them, and process them through the filter, we are still saving substantial time over the manual handling of paper.(ABSTRACT TRUNCATED AT 250 WORDS)

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BibTeXRIS

J D Rice. Using laptop computers as a BMET field service tool.. https://pubmed.ncbi.nlm.nih.gov/8275141/

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Optimal design of non-Newtonian, micro-scale viscous pumps for biomedical devices.

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↗