| 摘要 |
A trephination and irrigation set includes a drill guiding soft tissue protector sleeve, a trephination instrument (e.g., a drill) having a length longer than the protector sleeve, a guide rod dimensioned to fit into a trephine hole for preserving the hole through a soft tissue incision, and a tapered cannula sized to lodge in the frontal bone of the skull for introducing irrigation fluid through the cannula and into the frontal sinus cavity. The frontal sinus is treated through a hole drilled through the frontal bone. A small incision is made large enough to accept the soft tissue sleeve protector which is then inserted into the incision and depressed against the bony surface. The sleeve protector has teeth at its periosteal (or distal) edge for gripping the bone securely. The surgeon inserts the drill into the sleeve protector and drills straight through the front table. Once the drill is in the frontal cavity, the sleeve is used to maintain the position of the trephine hole while the drill is withdrawn, whereupon the sleeve remains in place while the guide pin is inserted into the trephine hole. After the guide pin is inserted through the trephine hole, the surgeon removes the soft tissue protector sleeve and the guide pin remains in place to axially guide the irrigation cannula onto sealing engagement with the trephine hole. The tapered irrigation cannula is sized to be retained within the bony trephine hole in the frontal bone and is configured to avoid falling into the sinus. The guide pin is then removed and an I.V. tube is fitted to the cannula proximal end for irrigation or aspiration. |
