Abstract:Objective To investigate the value of self-made guide device in nasobiliary conversion based on the short nasobiliary duct and guide wire extraction method.Methods The clinical data of 120 patients who underwent endoscopic nasobiliary drainage from May to June 2021 were analyzed retrospectively. According to the type of self-made guide device, the patients were divided into group A (balloon catheter for nipple dilatation, n = 60), group B (balloon catheter for lithotomy, n = 40) and group C (without self-made guide device, n = 20). The extraction time of nasobiliary duct, the score of patients' response to stimulation and the incidence of nasal mucosal bleeding were compared among the three groups.Results The extraction time of nasobiliary duct in the group A was (5.13 ± 0.85) s, it was (7.20 ± 0.88) s in the group B, (11.30 ± 1.42) s in the group C and the difference was significant (F = 303.04, P = 0.000). The score of patients' response to stimulation in the group A was 1.00 (1.00, 1.00), it was 2.00 (1.00, 2.00) in the group B, 2.00 (2.00, 3.00) in the group C, and the difference was significant (Z = 47.89, P = 0.000). The incidence of nasal mucosal bleeding in the group A was 1.67% (1/60), it was 20.00% (8/40) in the group B, 40.00% (8/20) in the group C, and the difference was significant (χ2 = 19.81, P = 0.000).Conclusion When the short nasobiliary duct and guide wire extraction method is used for nasobiliary conversion, the nipple dilatation balloon catheter should be used to make the guide device, which can speed up the extraction speed of nasobiliary duct, reduce the discomfort reaction of patients and the side injury of nasal mucosa, and is worthy of clinical promotion.