SYSTEMS AND METHODS FOR TREATING HYDROCEPHALUS

An endovascular shunt implantation system, comprising a guide member (320) having a distal portion configured for being deployed in an inferior petrosal sinus (IPS) of a patient; a delivery catheter (3304) movably coupled to the guide member (320), wherein a distal end of the delivery catheter comprises or is otherwise coupled to a tissue penetrating element (3350), such that the delivery catheter (3304) and tissue penetrating element (3350) are translatable relative to the distal portion of the guide member (302) within the IPS of the patient, the delivery catheter (3304) comprising a lumen (3341) in communication with an opening in the tissue penetrating element (3350); and a guard member (4000) at least partially disposed over, and movable relative to, the tissue penetrating element (3350), the guard member (4000) having an open distal end portion including an inner surface feature (4030) configured to deflect the tissue penetrating element (3350) away from the guide member (320) when the tissue penetrating element (3350) is translated distally relative to the guard member (4000) or when the guard member (4000) is withdrawn proximally relative to the tissue penetrating element (3350).