A device (1) for restraining attached couplers (4, 5) of a percutaneous lead assembly(7). The device (1) comprises a body (14) including two engagement means (8) positionedat opposite ends that engage with the respective couplers (4, 5) to resist disconnection,and an attachment means (9) to attach the device (1) to the outer epidermis of apatient to limit movement of the device (1), when in use.