Conventional implantable leads comprise one or more restraints in the form of barbs to reduce the risk of lead migration. However, these barbs make it more difficult to explant (remove) the medical lead. They may also lead to reduced comfort, and often results in the lead protrusions piercing through the skin. An implantable restraint (100, 101, 102) is provided comprising an opening (500), configured to receive a tissue anchor； a pair of protrusions (401, 404), between the opening (500) and a distal edge, providing an anchor resistance to a longitudinal force (610)； wherein the pair of protrusions (401, 404) are further configured to separate by a distance approximately equal to the tissue anchor when the longitudinal force (610) exceeds a first predetermined threshold, such that the pair of protrusions (401, 404) moves past the tissue anchor. By providing one or more openings extending through the substrate, the growth of tissue which naturally occurs after implantation is utilized to assist in securing the implantable restraint at the implantation site. By providing the pair of protrusions configured to provide resistance, a high degree of control of the restraining force and the explantation force is provided.L'invention a pour but de résoudre le problème suivant : les sondes implantables classiques comprennent un ou plusieurs dispositifs de retenue sous forme de barbillons pour diminuer le risque de migration de sonde. Cependant, ces barbillons compliquent l'explantation (le retrait) de la sonde médicale. Ils peuvent également occasionner un confort réduit, et amènent souvent les parties saillantes de sonde à percer la peau. Un dispositif de retenue implantable (100, 101, 102) comprend une ouverture (500), configurée pour recevoir un élément d'ancrage de tissu ； une paire de parties saillantes (401, 404), entre l'ouverture (500) et un bord distal, fournissant une résistance d'ancrage à une force longitudinale (610) ； la paire de parties saillantes (401, 404) ét
