The Development of a Novel Device Based on Loss of Guidewire Resistance to Identify Epidural Space in a Porcine Model

Table 1

Results of extractable substance test (: test standard value of Korean Pharmacopoeia [11]).

	PLA-FDM	Resin-SLA
Appearance (clear)	Clear	Clear
pH (<1.5)	0.07	0.58
Reducing substance (<2 mL)	0.1282 mL	5.75 mL
UV absorbance (<0.1)	0.002	3.927
Residue on evaporation (<1.0 mg)	0.2 mg	12.9 mg
Heavy metal (negative)	Negative	Negative