Application of fault tree analysis in maintenance of ultrasonic diagnostic equipment
Objective To completely analyze the fault of ultrasonic diagnostic instrument by fault tree analysis.Methods A total of 60 ultrasonic diagnostic equipment of GE,Philips,Siemens,Sono and other brands were selected from one Class A ter-tiary general hospital by December 2021,and the maintenance data from 2020 to 2021 were summarized,with a total of 410 sets.The fault tree analysis method was used to establish fault tree model of ultrasonic diagnostic instrument.The fault of ul-trasonic diagnostic instrument was set as the top event of fault tree,the fault category was intermediate event,and minimum fault cause was found step by step downward as the basic event.The probe failure(M1)was taken as an example,and probe failure causes were included lens bubble cracking(X1),probe housing cracking(X2),probe cable cracking(X3),probe interface failure(X4),crystal vibration failure(X5),and probe circuit board failure(X6).The qualitative and quantitative analyses were per-formed.Results The qualitative and quantitative model of fault tree of medical ultrasonic diagnosis instrument was obtained,the probabilistic importance Ig(i)=∂Q(T)/∂Pi=Q(1i,T)-Q(0i,T)[Q(T):fault probability function of fault tree;Pi:i basic event probability;Q(1i,T):probability of T occurred at i basic event;Q(0i,T):probability of T occurred at non-i basic event]and critical importance Ig(i)=lim(ΔQ/Q)/(ΔPi/Pi)=Pi/Q(T)× Ig(i)[Ig(i):i basic event probabilistic importance].The minimum num-ber of cut sets that caused fault of ultrasonic diagnostic equipment was 28,and fault probability of top event was 0.438 472.Six basic events[poor heat dissipation of host(X 14),system software fault(X10),button fault(X17),trackball fault(X19),interfer-ence fault(X25),probe cable rupture(X3)]which had great impact on top events were found by quantitative analysis.The model was validated,and then maintenance advices were put forward according to actual situation.Conclusion It is demonstrated that the application of fault tree analysis method in maintenance of medical ultrasonic diagnostic equipment is feasible,which could provide decision support for preventive maintenance and risk control of ultrasonic diagnostic maintenance.
fault tree analysisultrasonic diagnostic equipmentqualitative analysisquantitative analysis
NETL
NSTL
万方数据
维普
