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  Indian J Med Microbiol
 

Figure 3: Graphical representation of pressure trace displayed on the monitor screen of the device. Left horizontal arrow showing dip of pressure trace on voluntary release of occlusion (pre-procedural instrument checking) and right horizontal arrow showed sudden fall in pressure trace on localisation of the space sooner the needle pierces ligamentum flavum, while vertical arrow shows gradual rise of pressure as the needle crossing the ligaments

Figure 3: Graphical representation of pressure trace displayed on the monitor screen of the device. Left horizontal arrow showing dip of pressure trace on voluntary release of occlusion (pre-procedural instrument checking) and right horizontal arrow showed sudden fall in pressure trace on localisation of the space sooner the needle pierces ligamentum flavum, while vertical arrow shows gradual rise of pressure as the needle crossing the ligaments