Abstract: A filtration device includes: a housing that defines a liquid flow path; and a filtration sheet that separates the liquid flow path into a flow path upstream side and a flow path downstream side. The housing includes: a first housing member and a second housing member that sandwich the filtration sheet, and a joining member that joins the first housing member and the second housing member in a state in which the filtration sheet is sandwiched between the first housing member and the second housing member. A gap is located between the first housing member and the second housing at a position outward of an outer edge of the filtration sheet. The joining member seals the gap between the first housing member and the second housing member at the position outward of the outer edge of the filtration sheet.

Abstract: A puncture needle is constituted of a resin material. The puncture needle comprises: an elongated main body having a sharp needlepoint at a distal end thereof; and at least three cutting parts provided so as to project from the elongated main body to a direction perpendicular to a central axis of the elongated main body, extending along the central axis, and arranged around the central axis. Adjacent cutting parts in the three cutting parts are arranged so as to shift to each other in a direction of the central axis, so that the adjacent cutting parts make an incision on a biological surface in a time difference. Further, a height of a distal portion of each cutting part from the central axis is gradually decreased toward a distal direction.

Abstract: A puncture needle is constituted of a resin material. The puncture needle comprises: an elongated main body having a sharp needlepoint at a distal end thereof; and at least three cutting parts provided so as to project from the elongated main body to a direction perpendicular to a central axis of the elongated main body, extending along the central axis, and arranged around the central axis. Adjacent cutting parts in the three cutting parts are arranged so as to shift to each other in a direction of the central axis, so that the adjacent cutting parts make an incision on a biological surface in a time difference. Further, a height of a distal portion of each cutting part from the central axis is gradually decreased toward a distal direction.