An embodiment includes a system comprising: a catheter; an optic fiber having a long axis and a short axis that is orthogonal to the long axis; first and second radiopaque elements coupled to the optic fiber; a first wire coupled to the optic fiber and extending from the first radiopaque element to the second radiopaque element; a fluid; wherein (a)(i) the first wire wraps at least partially around an exterior surface of the optic fiber; (a)(ii) an outer diameter of the first wire and an outer diameter of the optic fiber are collectively less than an inner diameter of the catheter, and (a)(iii) the first wire is configured to center the optic fiber within the catheter within a plane orthogonal to the long axis.

Provided herein are catheter assemblies with detachment means for delivering implants. A method for coil embolization using a catheter includes: inserting a catheter into a patient intravenously or intraarterially; navigating the catheter to an aneurysm, the catheter defining an outer wall; placing a tip of the catheter at an opening of the aneurysm; delivering into the aneurysm, via pusher wire, through a lumen of the catheter, a coil; determining a user defined detachment point at which a distal coil segment of the coil should be detached from the coil; aligning the user defined detachment point of the coil with a designated detachment zone at the tip of the catheter; and toggling a laser source connected to the embedded optical fiber, thereby detaching the distal coil segment from the coil via an embedded laser beam emitted from the optical fiber at the designated detachment zone at the tip of the catheter.

A system for delivering an implant device to a vascular site in a patient a delivery pusher apparatus, an implant device detachably connected to the delivery pusher apparatus by a tether having a distal end connected to a proximal end of the implant device, wherein the tether is substantially non-tensioned when connecting the implant device to the delivery pusher, and an electrical heating element configured coaxially around at least a portion of the tether, wherein heat generated by the heating element severs the tether at a point near the proximal end of the implant device.

A novel shape memory polymer (SMP)-based device for surgical treatment of an intracorporeal defect (e.g., a void or anomaly) such as an intracranial aneurysm or fistula. In at least one non-limiting embodiment, the SMP device is a 3D-printed SMP material sized to specifically fit and thus occlude an intracranial aneurysm (ICA). The SMP device may be delivered to the intracorporeal defect via a catheter having a heating mechanism wherein the SMP device is raised above its glass transition temperature as it is deployed, causing the SMP device to return to its permanent shape after it is deployed into the intracorporeal defect. SMP device delivery systems that include the SMP devices, as well as methods of making and using the devices and systems, are also disclosed.