Suture delivery device

A method comprising:

• delivering, via an assembly, a suture element to an aperture in a vessel wall, the assembly comprising:
• a body comprising the suture element held within the body and at least one suture capture rod within the body, the suture capture rod being operatively associated with the suture element and arranged to pass the suture element through the vessel wall such that opposed portions of the suture element extend from the vessel wall, the body further comprising a distal housing portion at a distal end of the body;
• a proximal guidewire extension;
• and
• a removable guidewire segment;
• wherein the assembly comprises a first configuration and a second configuration;
• wherein in the first configuration the removable guidewire segment is removably attached to the distal housing portion of the body and detached from the proximal guidewire extension, and in the second configuration the removable guidewire segment is detached from the body and removably attached via a coupling component to a distal end of the proximal guidewire extension such that there is a first smooth transition at a first juncture between the proximal guidewire extension and the coupling component and a second smooth transition at a second juncture between the removable guidewire segment and the coupling component;
• wherein the assembly is configured to pass the suture element through the vessel wall in the first configuration.