Catheter assembly
AssigneeTerumo Kabushiki Kaisha
InventorTakayuki Yokota
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Abstract
A catheter assembly includes: a catheter having an inner cavity extending along a center axis of the catheter, the catheter comprising, on a distal side, a tapered portion that is tapered in a distal direction; and an inner needle retractably located in the inner cavity. The inner needle comprises, on a distal side, a blade surface that is inclined with respect to a center axis of the inner needle. The tapered portion covers a proximal end portion of the blade surface in an assembled state in which the inner needle is located in the inner cavity, and an inner shape of a distal-most end of the tapered portion conforms to the blade surface.
Claims18
A catheter assembly comprising:
- a catheter having an inner cavity extending along a center axis of the catheter, the catheter comprising, on a distal side, a tapered portion that is tapered in a distal direction;
- and
- an inner needle retractably located in the inner cavity;
- wherein the inner needle comprises, on a distal side, a blade surface that is inclined with respect to a center axis of the inner needle;
- wherein the tapered portion covers a proximal end portion of the blade surface in an assembled state in which the inner needle is located in the inner cavity, and an inner shape of a distal-most end of the tapered portion conforms to the blade surface;
- wherein, in a cross section orthogonal to the center axis of the inner needle, an outer peripheral surface of the distal side of the inner needle comprises:
- the blade surface, and
- an arcuate surface;
- and
- wherein in a cross section orthogonal to the center axis of the catheter in the assembled state, the tapered portion comprises:
- a flat portion having an inner surface opposing the blade surface, and
- an arcuate portion opposing the arcuate surface.
A method of making a catheter assembly comprising:
- providing a catheter having an inner cavity extending along a center axis of the catheter, the catheter comprising, on a distal side, a tapered portion that is tapered in a distal direction;
- and
- inserting an inner needle into the inner cavity;
- wherein the inner needle comprises, on a distal side, a blade surface that is inclined with respect to a center axis of the inner needle;
- wherein, after the inner needle is inserted into the inner cavity, the tapered portion covers a proximal end portion of the blade surface in an assembled state in which the inner needle is located in the inner cavity, and an inner shape of a distal-most end of the tapered portion conforms to the blade surface;
- and
- wherein, in a cross section orthogonal to the center axis of the inner needle, an outer peripheral surface of the distal side of the inner needle comprises:
- the blade surface, and
- an arcuate surface;
- and
- wherein in a cross section orthogonal to the center axis of the catheter in the assembled state, the tapered portion comprises:
- a flat portion having an inner surface opposing the blade surface, and
- an arcuate portion opposing the arcuate surface.
Dependencies are inferred from the claim text.