Implant (e.g., sensory implant) positionable within subject's left heart atrium, for facilitating functional activity thereof, such as sensing or/and measuring physiological conditions or/and parameters. Implant includes: implant body housing physiological parameter sensing or/and measuring means； coupling means for coupling with an implant deployment device； and septum gripper having a flexible gripping sleeve fixedly connected to implant body wall, and selectively shapeable to pass through organ wall septum opening, and for gripping onto organ wall, such that implant body is fixatable or/and stabilizable across organ wall and through septum opening, to facilitate sensing or/and measuring in subject's body organ. Also disclosed are: a system including the implant, a process control unit, and a transcatheter implant deployment device； and an implant for implantation in subject's body organ separated by an organ wall, and configured for inductive coupling with electronic unit located outside subject's body and for interactively communicating with electronic unit.
