A system for draining excess fluid from a region of a patient body, in particular from the anterior chamber of the eye, the region bordered by a tissue, the system comprising: a drain clip (70; 80) having: an elongate leg (73; 82) configured for advancing distally into the tissue, the leg having a channel (74; 81) extending therealong; and a base (75; 84) disposed adjacent a proximal end of the leg (73; 82), the base being orientable to engage the tissue; the leg comprising a tubular body having a proximal opening and a distal opening with a lumen (74; 81) therebetween, the channel comprising the lumen, the leg being configured to be advanced distally with a deployment shaft (76; 85) of a deployment assembly (62; 83) disposed in the lumen (74; 81) so as to inhibit ingress of tissue therein; and wherein the shaft (76; 85) is configured to be withdrawn proximally from the lumen so as to facilitate passing the fluid along the lumen, the deployment assembly (62; 83) releasably supporting the clip and including a sharpened distal end extending distally of the drain clip so as to facilitate the tissue penetration, characterised in that at least a portion of the leg (73; 82) of the drain clip (70; 80) is deformable so that the base (75; 84) and the leg (73; 82) affix the drain clip to the tissue, and so as to pass the excess fluid from the region along the channel (74; 81) of the leg and wherein the shaft (76; 85) of the deployment assembly comprises an actuatable shaft configured, upon actuation, from outside the tissue to deform the leg (73; 82) so that the shaft bends a distal foot (73; 86) of the leg laterally to capture the tissue between the foot and the base. a drain clip (70; 80) having: an elongate leg (73; 82) configured for advancing distally into the tissue, the leg having a channel (74; 81) extending therealong; and a base (75; 84) disposed adjacent a proximal end of the leg (73; 82), the base being orientable to engage the tissue; the leg comprising a tubular body having a proximal opening and a distal opening with a lumen (74; 81) therebetween, the channel comprising the lumen, the leg being configured to be advanced distally with a deployment shaft (76; 85) of a deployment assembly (62; 83) disposed in the lumen (74; 81) so as to inhibit ingress of tissue therein; and wherein the shaft (76; 85) is configured to be withdrawn proximally from the lumen so as to facilitate passing the fluid along the lumen, the deployment assembly (62; 83) releasably supporting the clip and including a sharpened distal end extending distally of the drain clip so as to facilitate the tissue penetration, characterised in that at least a portion of the leg (73; 82) of the drain clip (70; 80) is deformable so that the base (75; 84) and the leg (73; 82) affix the drain clip to the tissue, and so as to pass the excess fluid from the region along the channel (74; 81) of the leg and wherein the shaft (76; 85) of the deployment assembly comprises an actuatable shaft configured, upon actuation, from outside the tissue to deform the leg (73; 82) so that the shaft bends a distal foot (73; 86) of the leg laterally to capture the tissue between the foot and the base. an elongate leg (73; 82) configured for advancing distally into the tissue, the leg having a channel (74; 81) extending therealong; and a base (75; 84) disposed adjacent a proximal end of the leg (73; 82), the base being orientable to engage the tissue; the leg comprising a tubular body having a proximal opening and a distal opening with a lumen (74; 81) therebetween, the channel comprising the lumen, the leg being configured to be advanced distally with a deployment shaft (76; 85) of a deployment assembly (62; 83) disposed in the lumen (74; 81) so as to inhibit ingress of tissue therein; and wherein the shaft (76; 85) is configured to be withdrawn proximally from the lumen so as to facilitate passing the fluid along the lumen, the deployment assembly (62; 83) releasably supporting the clip and including a sharpened distal end extending distally of the drain clip so as to facilitate the tissue penetration, characterised in that at least a portion of the leg (73; 82) of the drain clip (70; 80) is deformable so that the base (75; 84) and the leg (73; 82) affix the drain clip to the tissue, and so as to pass the excess fluid from the region along the channel (74; 81) of the leg and wherein the shaft (76; 85) of the deployment assembly comprises an actuatable shaft configured, upon actuation, from outside the tissue to deform the leg (73; 82) so that the shaft bends a distal foot (73; 86) of the leg laterally to capture the tissue between the foot and the base.