An implant device (200, 300, 354, 400, 502, 522, 630) for implantation in a human to fluidly connect a lacrimal apparatus to a paranasal sinus through a fistula formed between the lacrimal apparatus and the paranasal sinus, the implant device (200, 300, 354, 400, 502, 522, 630) characterized as comprising: a proximal end (202, 302, 402) at a first longitudinal end of the implant device (200, 300, 354, 400, 502, 522, 630), configured to be disposed in the lacrimal apparatus when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; a distal end (204, 304, 404) at a second longitudinal end of the implant device (200, 300, 354, 400, 502, 522, 630) that is longitudinally opposite the first longitudinal end, configured to be disposed in the paranasal sinus when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; a conduit (208, 240, 250, 308, 408, 506, 526) extending from adjacent the proximal end (202, 302, 402) to adjacent the distal end (204, 304, 404), configured to be disposed through the fistula when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; an internal passage (210, 310, 410) extending between the proximal end (202, 302, 402) and the distal end (204, 304, 404) and through the conduit (208, 240, 250, 308, 408, 506, 526), the internal passage (210, 310, 410) having a first end open at the proximal end (202, 302, 402) and a second end open at the distal end (204, 304, 404) configured to fluidly connect the lacrimal apparatus and the paranasal sinus when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; a length of the implant device (200, 300, 354, 400, 502, 522, 630) longitudinally along the implant device (200, 300, 354, 400, 502, 522, 630) between the proximal end (202, 302, 402) and the distal end (204, 304, 404) in a range of from 8 millimeters to 50 millimeters; a width of the internal passage (210, 310, 410) transverse to the length in a range of from 0.25 millimeter to 5 millimeters; and an exterior of the conduit (208, 240, 250, 308, 408, 506, 526) comprising an anchoring surface feature including protrusion areas (212, 242, 252, 312, 412) and recess areas (214, 244, 254, 314, 414), with at least a portion of the protrusion areas (212, 242, 252, 312, 412) to be disposed in the fistula to engage tissue exposed within the fistula to anchor the implant device (200, 300, 354, 400, 502, 522, 630) when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted, and wherein; the conduit (208, 240, 250, 308, 408, 506, 526) has an exterior width (224, 246, 256,) defined by an extent of the protrusion areas (212, 242, 252, 312, 412) transverse to the length of the implant device that is within a range of from 2 millimeters to 8 millimeters; and the protrusion areas (212, 242, 252, 312, 412) are constructed of a polymeric material having a durometer (Shore A) in a range of from 50 to 100. a proximal end (202, 302, 402) at a first longitudinal end of the implant device (200, 300, 354, 400, 502, 522, 630), configured to be disposed in the lacrimal apparatus when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; a distal end (204, 304, 404) at a second longitudinal end of the implant device (200, 300, 354, 400, 502, 522, 630) that is longitudinally opposite the first longitudinal end, configured to be disposed in the paranasal sinus when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; a conduit (208, 240, 250, 308, 408, 506, 526) extending from adjacent the proximal end (202, 302, 402) to adjacent the distal end (204, 304, 404), configured to be disposed through the fistula when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; an internal passage (210, 310, 410) extending between the proximal end (202, 302, 402) and the distal end (204, 304, 404) and through the conduit (208, 240, 250, 308, 408, 506, 526), the internal passage (210, 310, 410) having a first end open at the proximal end (202, 302, 402) and a second end open at the distal end (204, 304, 404) configured to fluidly connect the lacrimal apparatus and the paranasal sinus when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted; a length of the implant device (200, 300, 354, 400, 502, 522, 630) longitudinally along the implant device (200, 300, 354, 400, 502, 522, 630) between the proximal end (202, 302, 402) and the distal end (204, 304, 404) in a range of from 8 millimeters to 50 millimeters; a width of the internal passage (210, 310, 410) transverse to the length in a range of from 0.25 millimeter to 5 millimeters; and an exterior of the conduit (208, 240, 250, 308, 408, 506, 526) comprising an anchoring surface feature including protrusion areas (212, 242, 252, 312, 412) and recess areas (214, 244, 254, 314, 414), with at least a portion of the protrusion areas (212, 242, 252, 312, 412) to be disposed in the fistula to engage tissue exposed within the fistula to anchor the implant device (200, 300, 354, 400, 502, 522, 630) when the implant device (200, 300, 354, 400, 502, 522, 630) is implanted, and wherein; the conduit (208, 240, 250, 308, 408, 506, 526) has an exterior width (224, 246, 256,) defined by an extent of the protrusion areas (212, 242, 252, 312, 412) transverse to the length of the implant device that is within a range of from 2 millimeters to 8 millimeters; and the protrusion areas (212, 242, 252, 312, 412) are constructed of a polymeric material having a durometer (Shore A) in a range of from 50 to 100.