Medical puncture needle and method for manufacturing puncture needle
AssigneeTerumo Kabushiki Kaisha
InventorTakehiko UEDA
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Abstract
A medical puncture needle includes a rod-shaped main body portion; and a blade surface formed at a distal end portion of the main body portion. The blade surface includes a first blade surface portion and a second blade surface portion that intersect to form a blade edge. A needle tip is formed at a location at which a distal end of the blade edge intersects a first ridge line at an outer edge of the first blade surface and a second ridge line at an outer edge of the second blade surface. At least one of the blade surface portions is planar, and, in a central axis direction of the main body portion, said at least one blade surface portion extends to a location proximal of a middle position of a blade surface region in which the blade surface is formed.
Claims12
A medical puncture needle comprising:
- a rod-shaped main body portion;
- and
- a blade surface formed at a distal end portion of the main body portion,
- wherein the blade surface comprises a first blade surface portion and a second blade surface portion that intersect to form a blade edge,
- wherein a needle tip is formed at a location at which a distal end of the blade edge intersects a first ridge line at an outer edge of the first blade surface and a second ridge line at an outer edge of the second blade surface, and
- wherein at least one blade surface portion among the first blade surface portion and the second blade surface portion is planar, and, in a central axis direction of the main body portion, said at least one blade surface portion extends to a location proximal of a middle position of a blade surface region in which the blade surface is formed.
A method for manufacturing a medical puncture needle that includes a tubular member and a blade surface formed at a distal end portion of the tubular member, the method comprising:
- providing a tubular member;
- forming, in the tubular member, an original shape blade surface portion inclined with respect to a central axis direction of the tubular member;
- and
- forming, from a part of a distal end side of the original shape blade surface portion, a first blade surface portion and a second blade surface portion that intersect to form a blade edge, wherein a needle tip is formed at a location at which a distal end of the blade edge intersects a first ridge line at an outer edge of the first blade surface and a second ridge line at an outer edge of the second blade surface,
- wherein at least one blade surface portion among the first blade surface portion and the second blade surface portion is planar, and, in a central axis direction of the tubular member, said at least one blade surface portion extends to a location proximal of a middle position of a blade surface region in which the blade surface is formed.
A medical puncture needle comprising:
- a tubular main body portion;
- and
- a blade surface formed at a distal end portion of the main body portion,
- wherein, in a side view in which the needle tip is located at one end in a direction orthogonal to a central axis direction of the main body portion, an inner edge of the blade surface comprises a curved portion which extends to be curved in a concave shape from a distal end of the inner edge, and
- the curved portion extends to a location proximal of a middle position of the inner edge in the central axis direction.
Dependencies are inferred from the claim text.