the expansion mechanism 6 may serve as a biasing force to bias the expansion mechanism 6 toward an expanded or unexpanded state as may be advantageous in various circumstances for example it may be advantageous to bias the expansion mechanism 6 toward an unexpanded state to provide a low profile device for insertion other devices such as but not limit to the elongated member 101 or a fluid injected through the port 7 may be used to expand the expansion mechanism 6 a fluid that drives linear expansion of the expandable medical implant 1 or maintains linear expansion of the expandable medical implant 1 may be introduced through the port 7 the fluid may be merely for expansion and retention or may be a component of a fill material intended to remain in the expansion mechanism 6 as used in association with this function a fluid may be a paste gel liquid suspension granular mixture or similar substance a substance as described herein will be considered a fluid even if it later cures or hardens to a non fluidic state both the expansion mechanism 6 and the membrane 5 may be initially unexpanded linearly the port 7 may also be used to handle the expandable medical implant 1 or to guide the implant into a position where it can be effectively deployed in other circumstances it may be preferred to bias the.