Apparatus for delivery through tissue in a constrained state within a deployment tool (30), the apparatus comprising a tissue anchor (120), which comprises: a shaft (122), which comprises a sealing element (190)； a head (124) connected to a proximal portion (126) of the shaft (122)； and a tissue-coupling element (128), which extends from a distal end (130) of the shaft (122), wherein, when the tissue anchor (120) is unconstrained by the deployment tool (30): the shaft (122) has a central longitudinal axis (134), the head (124) is coaxial with the central longitudinal axis (134), and the tissue-coupling element (128) is shaped such that if the tissue-coupling element (128) were to be projected onto a plane (136) that is perpendicular to the central longitudinal axis (134), (a) at least 80% of an area (138) of a projection (139) of the tissue-coupling element (128) on the plane (136) would fall within a first angle (±) of 180 degrees in the plane (136) having a vertex (140) at the central longitudinal axis (134), and (b) the area (138) would partially overlap, at least 3 mm from the vertex (140), both rays (142A, 142B) of a second angle (²) of between 45 and 180 degrees in the plane (136) having the vertex (140) at the central longitudinal axis (134).L'invention concerne un ancrage de tissu (200, 258, 300) qui comprend un arbre (122), un élément de couplage de tissu (128) et un élément de tension allongé et souple (202). L'élément de couplage de tissu (128) comprend un fil (150), celui-ci se présentant sous la forme d'une boucle ouverte (154) ayant plus d'un tour lorsque l'ancrage de tissu (200, 258, 300) n'est pas contraint. L'élément de tension (202) comprend une partie distale (204), qui est fixée à un site (206) sur la boucle ouverte (154), une partie proximale (208), qui présente un segment longitudinal (209) qui s'étend le long d'au moins une partie (210) de l'arbre (122), et une partie de croisement (212), qui (i) est disposée entre les parties distale et proxi
