Economical Fault-Tolerant Design In Medical Laser Systems

John L. Jayne; Bruce L. Redlien

doi:10.1117/12.952067

11 September 1989 Economical Fault-Tolerant Design In Medical Laser Systems

John L. Jayne, Bruce L. Redlien

Proceedings Volume 1066, Laser Surgery: Advanced Characterization, Therapeutics, and Systems; (1989) https://doi.org/10.1117/12.952067
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Control system design for medical products has been greatly enhanced by the advent of microcontrollers. However, the introduction of software control has given rise to a new class of potentially hazardous, fault-intolerant situations. This paper discusses a system of hardware/software interrelationships which provide for efficient fault tolerant control system design. Medical laser systems under unsupervised, nonredundant (single) processor control are easily designed but are considered unsafe by most regulatory commissions. Redundant (multiple) processor control is considered safe but system development is complicated and hence prohibitively expensive for small scale medical systems. A nonredundant processor utilizing a software kernal and a hardware shell can be easily configured to satisfy regulatory safety requirements. Such a system retains much of the pliancy inherent in software control while adding the simplicity and reliability of hardware safety constraints. The hardware/software interaction forms a hybrid redundancy whereby the software serves to monitor the integrity of the hardware and the hardware maintains operational boundaries for the software. The initial hardware design remains fixed according to system performance requirements. Very little special software is needed to accommodate the hardware constraints and most system operational changes can be made solely via software. This results in a system design which is safe, sufficiently flexible, and economically feasible.

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John L. Jayne and Bruce L. Redlien "Economical Fault-Tolerant Design In Medical Laser Systems", Proc. SPIE 1066, Laser Surgery: Advanced Characterization, Therapeutics, and Systems, (11 September 1989); https://doi.org/10.1117/12.952067

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KEYWORDS

Control systems

Safety

Laser therapeutics

Control systems design

LASIK

Laser systems engineering

Reliability

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