A 37-year-old woman presented at 37 weeks of gestation with a history of heaviness in her left leg. Enhanced computed tomography revealed a left extensive ileofemoral thrombus, and we employed a transient inferior vena cava (IVC) filter (t-IVCF) before delivery. Although we attempted to remove the t-IVCF on the day after delivery, a large thrombus was captured in the filter. We therefore performed thrombolytic therapy for one week, but a few small clots remained within the t-IVCF. We were ultimately able to remove the t-IVCF under constant negative pressure by aspiration from a side-hole of the sheath. We herein describe the effectiveness of this aspiration technique in our case.