A catheter assembly includes an internal bolster comprising a plurality of resilient members collectively forming an anchor at a first end of the catheter. Each resilient member is reversibly transformable between a spiral shape, when at rest, and a straightened shape, when forcibly unfurled. The catheter assembly may be used in a method for inserting a gastrostomy tube into a patient. The catheter assembly is inserted into the patients stomach with the resilient members in the unfurled straightened state. Once the resilient members have entered the patient, the resilient members are allowed to return to the relaxed spiral shape, thereby anchoring the catheter assembly in the patient.
