Dilator
AssigneeTerumo Kabushiki Kaisha
InventorsRyo OKAMURA, Toshiaki Shinohara
Life of this patent
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Abstract
A dilator which can suppress rapid change in resistance and can perform smooth insertion into a hole includes a distal portion, an outer diameter of which increases towards a proximal end side in an axial direction; and a reduced cross-sectional area portion which is provided at least on a largest outer diameter portion of the distal portion, and is obtained by reducing a part of an outer periphery of a circular cross section, and a width of the reduced cross-sectional area portion in a chord direction is equal to or greater than a depth of the reduced cross-sectional area portion in a direction perpendicular to the chord direction.
Claims8
A dilator comprising:
- a distal portion, an outer diameter of which increases towards a proximal end side in an axial direction;
- and
- a reduced cross-sectional area portion which is provided at least on a largest outer diameter portion of the distal portion, and is obtained by reducing a part of an outer periphery of a circular cross section,
- wherein a width of the reduced cross-sectional area portion in a chord direction is equal to or greater than a depth of the reduced cross-sectional area portion in a direction perpendicular to the chord direction.
A dilator comprising:
- a distal portion, an outer diameter of which increases towards a proximal end side in an axial direction;
- and
- a reduced cross-sectional area portion which is provided at least on a portion in which a rate of increase of the outer diameter of the distal portion changes, and is obtained by reducing a part of an outer periphery of a circular cross section,
- wherein a width of the reduced cross-sectional area portion in a chord direction is equal to or greater than a depth of the reduced cross-sectional area portion in a direction perpendicular to the chord direction.
A dilator comprising:
- a distal portion, an outer diameter of which increases towards a proximal end side in an axial direction;
- and
- a reduced cross-sectional area portion which is provided on a portion in which a rate of increase of the outer diameter of the distal portion changes and on a largest outer diameter portion of the distal portion, and is obtained by reducing a part of an outer periphery of a circular cross section,
- wherein a width of the reduced cross-sectional area portion in a chord direction is equal to or greater than a depth of the reduced cross-sectional area portion in a direction perpendicular to the chord direction.
Dependencies are inferred from the claim text.