A system for delivering an implantable tissue fixation device, comprising: a tissue fixation device including first and second elongate, substantially rigid support members (102, 104) that are discrete elements separated from each other, the tissue fixation device having changeable dimensions such that the device has a delivery configuration and a deployed configuration, wherein the tissue fixation device has at least one dimension that is smaller in the delivery configuration than in the deployed configuration; and at least one graft retention loop coupled to the tissue fixation device, characterised by: the tissue fixation device further including at least one flexible member connecting the first and second rigid support members; and the system further comprising a drill pin (700, 800, 900) having a sidewall (706, 806, 906) surrounding a cavity (704, 804, 904) at a proximal end (702, 802, 902) of the drill pin, the cavity being configured to fully seat the tissue fixation device wherein the drill pin further includes at least one longitudinally oriented opening (708, 808, 908) in the sidewall in communication with the cavity, wherein the drill pin is configured to substantially contain therein the tissue fixation device when in the delivery configuration, and wherein the drill pin is configured to enable deployment of the tissue fixation device through the opening. a tissue fixation device including first and second elongate, substantially rigid support members (102, 104) that are discrete elements separated from each other, the tissue fixation device having changeable dimensions such that the device has a delivery configuration and a deployed configuration, wherein the tissue fixation device has at least one dimension that is smaller in the delivery configuration than in the deployed configuration; and at least one graft retention loop coupled to the tissue fixation device, characterised by: the tissue fixation device further including at least one flexible member connecting the first and second rigid support members; and the system further comprising a drill pin (700, 800, 900) having a sidewall (706, 806, 906) surrounding a cavity (704, 804, 904) at a proximal end (702, 802, 902) of the drill pin, the cavity being configured to fully seat the tissue fixation device wherein the drill pin further includes at least one longitudinally oriented opening (708, 808, 908) in the sidewall in communication with the cavity, wherein the drill pin is configured to substantially contain therein the tissue fixation device when in the delivery configuration, and wherein the drill pin is configured to enable deployment of the tissue fixation device through the opening. the tissue fixation device further including at least one flexible member connecting the first and second rigid support members; and the system further comprising a drill pin (700, 800, 900) having a sidewall (706, 806, 906) surrounding a cavity (704, 804, 904) at a proximal end (702, 802, 902) of the drill pin, the cavity being configured to fully seat the tissue fixation device wherein the drill pin further includes at least one longitudinally oriented opening (708, 808, 908) in the sidewall in communication with the cavity, wherein the drill pin is configured to substantially contain therein the tissue fixation device when in the delivery configuration, and wherein the drill pin is configured to enable deployment of the tissue fixation device through the opening.