Efficacy and Safety of Dual-targeted Therapy With Upadacitinib and Ustekinumab Versus Intensified Ustekinumab Therapy in Crohn's Disease

The goal of this clinical trial is to evaluate the efficacy and safety of dual-target therapy (Ustekinumab combined with Upadacitinib) versus intensified Ustekinumab monotherapy in patients with Crohn's disease who have an inadequate response to standard doses of Ustekinumab. The main questions it aims to answer are: Is dual-target therapy more effective than intensified Ustekinumab monotherapy in achieving endoscopic remission in Crohn's disease patients? Is dual-target therapy as safe as intensified Ustekinumab monotherapy in terms of adverse events? Participants will: Receive either dual-target therapy (Ustekinumab combined with Upadacitinib) or intensified Ustekinumab monotherapy. Attend regular clinic visits for monitoring and assessments. Complete questionnaires about their symptoms and quality of life. Undergo routine blood tests and endoscopic evaluations to assess disease activity. Researchers will compare the dual-target therapy group to the intensified Ustekinumab monotherapy group to see if dual-target therapy is more effective in achieving endoscopic remission and is as safe in terms of adverse events.