Abstract: Objective To design a positioning and quantitative alarm device and explore its application effects in continuous drainage of lumbar cistern. Methods The positioning and quantitative alarm device was composed of lifting adjusting rod,alarm device,laser pointer,scale,lumbar cistern drainage bag,side panel,main panel,and etc. 21 bed ridden patients with lumbar cistern drainage tube were selected from the critical care department of a tertiary class A hospital in Hangzhou from May 2022 to September 2022 as the experimental group and were positioned with drainage tube positioning and quantitative alarm device. A total of 21 bed ridden patients with lumbar cistern drainage tube were selected from January 2022 to April 2022 as the control group,and were positioned with traditional tools. The average total positioning time,difference of average height measurement data and nursing staff satisfaction were compared between the two groups. Results The average total measuring time of lumbar cistern drainage bag in experimental group was （12.32±2.93）s,which was shorter than that in control group （33.24±8.84）s,and the difference was sta-tistically significant（t=38.298,P<0.001）. The difference of average height measurement data in the experimental group was （1.25±0.21）mm,which was less than that of the control group （7.03±1.92）mm,and the difference was statistically significant（t=20.456,P<0.001）. The satisfaction of nursing staff in experimental group（100%）was higher than that in control group（28.57%）,and the difference was statistically significant（P<0.05）. The daily drainage volume in the experimental group was（162±13）ml,its target accuracy was higher than that of the control group[（165±37）ml]. Conclusion The application of positioning and quantitative alarm device in the continuous drainage of lumbar cistern can effectively save the time of positioning measurement,improve the satisfaction of nursing staff.

Key words: Positioning, Clinical Alarms, Lumbar Cistern, Drainage, Critical Care Nursing