What component is inserted to capture the hook on the IVC filter during removal?

The correct answer is the snare wire, which is specifically designed to capture the hook of the inferior vena cava (IVC) filter during the removal process. When removing an IVC filter, it's crucial to securely capture the hook to facilitate a safe and effective retrieval. The snare wire is a looped wire that can be manipulated to engage the hook of the filter. Once the hook is captured, the snare allows for controlled withdrawal of the filter from the vascular system.

In contrast, the other options do not serve this specific purpose in the context of IVC filter removal. A guide wire is primarily used to navigate and position devices within the vascular system but does not have the ability to grasp or capture the hook of the filter. A retrieval sheath provides a passage for the filter to be pulled out but does not capture the hook itself. A catheter sheath is used to access the vascular space but similarly does not play a role in capturing the filter's hook during removal. Thus, the snare wire is the critical component for this process.