An infusion pump comprising: a pump body including a pumping mechanism; a platen assembly including a first platen member rotatably coupled to the pump body to pivot relative to the pump body about a first hinge axis and a second platen member rotatably coupled to the first platen member to pivot relative to the first platen member about a second hinge axis; wherein the platen assembly is pivotable about the first hinge axis to an open position in which the second platen member and the first platen member are positioned away from the pumping mechanism allowing a disposable administration set to be loaded into the infusion pump such that, in use, a tubing segment of the administration set is adjacent to the pumping mechanism; characterized in that the platen assembly is pivotable about the first hinge axis to a closed position in which the second platen member and the first platen member are positioned opposite and in proximity to the pumping mechanism such that, in use, the first and second platen members engage said tubing segment; the pump body includes a first alignment feature and a second alignment feature, the platen assembly includes a first alignment counter-feature and a second alignment counter-feature, and the first alignment feature and second alignment feature respectively mate with the first alignment counter-feature and the second alignment counter-feature when the platen assembly is in the closed position; and the first alignment counter-feature and the second alignment counter-feature are included on the second platen member, and movement of the platen assembly to the closed position will be prevented if the platen assembly is deformed beyond a predetermined tolerance limit. a pump body including a pumping mechanism; a platen assembly including a first platen member rotatably coupled to the pump body to pivot relative to the pump body about a first hinge axis and a second platen member rotatably coupled to the first platen member to pivot relative to the first platen member about a second hinge axis; wherein the platen assembly is pivotable about the first hinge axis to an open position in which the second platen member and the first platen member are positioned away from the pumping mechanism allowing a disposable administration set to be loaded into the infusion pump such that, in use, a tubing segment of the administration set is adjacent to the pumping mechanism; characterized in that the platen assembly is pivotable about the first hinge axis to a closed position in which the second platen member and the first platen member are positioned opposite and in proximity to the pumping mechanism such that, in use, the first and second platen members engage said tubing segment; the pump body includes a first alignment feature and a second alignment feature, the platen assembly includes a first alignment counter-feature and a second alignment counter-feature, and the first alignment feature and second alignment feature respectively mate with the first alignment counter-feature and the second alignment counter-feature when the platen assembly is in the closed position; and the first alignment counter-feature and the second alignment counter-feature are included on the second platen member, and movement of the platen assembly to the closed position will be prevented if the platen assembly is deformed beyond a predetermined tolerance limit.