A mesh deployment unit configured for selective connection to an actuation unit, the mesh deployment unit comprising: a frame assembly including first and second frame members (210, 230), configured for releasable support of a mesh, each of the first and second frame members (210, 230) including a mesh release assembly for selectively securing a mesh to the frame assembly; a connector assembly operably connectable to the frame assembly, the connector assembly including a connector member configured for selective attachment to the actuation unit; and an actuator assembly including an actuator shaft extending from the frame assembly through the connector assembly, a proximal end of the actuator shaft being disposed within the connector member and being operably engageable with a deployment rod of the actuation unit; characterised in that: movement of the actuator assembly in a first axial direction relative to the connector assembly is configured to move the frame assembly from an expanded condition to a collapsed condition, and movement of the actuator assembly in a second axial direction relative to the connector assembly is configured to return the frame assembly to the expanded condition and wherein each mesh release assembly includes a release link operably connected to the actuator assembly, and at least one clip member pivotally secured to the release link for releasably securing the mesh to the frame assembly; each release link being configured for movement from a first position to a second position to cause the movement of the at least one clip member of each of the mesh release assemblies from a locked position for retaining the mesh to the frame assembly, to an unlocked position, to permit the release of the mesh from the frame assembly and wherein each of the first and second frame members includes a respective first ramp to frictionally retain each release link in the first position. a frame assembly including first and second frame members (210, 230), configured for releasable support of a mesh, each of the first and second frame members (210, 230) including a mesh release assembly for selectively securing a mesh to the frame assembly; a connector assembly operably connectable to the frame assembly, the connector assembly including a connector member configured for selective attachment to the actuation unit; and an actuator assembly including an actuator shaft extending from the frame assembly through the connector assembly, a proximal end of the actuator shaft being disposed within the connector member and being operably engageable with a deployment rod of the actuation unit; characterised in that: movement of the actuator assembly in a first axial direction relative to the connector assembly is configured to move the frame assembly from an expanded condition to a collapsed condition, and movement of the actuator assembly in a second axial direction relative to the connector assembly is configured to return the frame assembly to the expanded condition and wherein each mesh release assembly includes a release link operably connected to the actuator assembly, and at least one clip member pivotally secured to the release link for releasably securing the mesh to the frame assembly; each release link being configured for movement from a first position to a second position to cause the movement of the at least one clip member of each of the mesh release assemblies from a locked position for retaining the mesh to the frame assembly, to an unlocked position, to permit the release of the mesh from the frame assembly and wherein each of the first and second frame members includes a respective first ramp to frictionally retain each release link in the first position.