Injection needle assembly and drug injection device
First Claim
1. An injection needle assembly comprising:
- an injection needle; and
a hub configured to hold the injection needle,wherein the hub comprises a fitting portion comprising a fitting opening at one end, and an inner fitted wall having a female taper shape with an inner diameter that decreases in a direction from the fitting opening toward an inner side of the fitting portion;
wherein the fitting portion is configured to be fitted to a drug discharge tube comprising an outer wall having a male taper shape with an outer diameter that decreases in a direction toward a tip of the drug discharge tube; and
wherein, at least at a portion of the fitted wall at which an outer edge of the tip of the drug discharge tube contacts the fitted wall when the fitting portion is fitted to the drug discharge tube, a taper ratio of the female taper shape of the fitted wall is greater than a taper ratio of the male taper shape of the drug discharge tube.
1 Assignment
0 Petitions
Accused Products
Abstract
An injection needle assembly includes an injection needle, a fitting portion, and a hub. The fitting portion is formed into a cylindrical shape and has one end serving as a fitting opening. The fitting portion includes a female taper shape in which an inner diameter of a cylindrical hole of the fitting portion becomes smaller toward an inner side. The hub includes the fitting portion for holding the injection needle. The injection needle assembly is used such that the female taper shape of the fitting portion is fitted to a drug discharge tube, which has a male taper shape in which an outer diameter of a cylinder becomes smaller toward a tip. When the male taper shape of the drug discharge tube has a taper ratio of N/100, the female taper shape of the fitting portion 12 is formed to have a taper ratio of M/100, where M>N.
14 Citations
17 Claims
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1. An injection needle assembly comprising:
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an injection needle; and a hub configured to hold the injection needle, wherein the hub comprises a fitting portion comprising a fitting opening at one end, and an inner fitted wall having a female taper shape with an inner diameter that decreases in a direction from the fitting opening toward an inner side of the fitting portion; wherein the fitting portion is configured to be fitted to a drug discharge tube comprising an outer wall having a male taper shape with an outer diameter that decreases in a direction toward a tip of the drug discharge tube; and wherein, at least at a portion of the fitted wall at which an outer edge of the tip of the drug discharge tube contacts the fitted wall when the fitting portion is fitted to the drug discharge tube, a taper ratio of the female taper shape of the fitted wall is greater than a taper ratio of the male taper shape of the drug discharge tube. - View Dependent Claims (2, 3, 4, 5, 6, 14, 15, 16, 17)
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7. An injection needle assembly comprising:
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an injection needle; and a hub configured to hold the injection needle, wherein the hub comprises a fitting portion comprising a fitting opening at one end, and an inner fitted wall having a female taper shape with an inner diameter that decreases in a direction from the fitting opening toward an inner side of the fitting portion; wherein the fitting portion is configured to be fitted to a drug discharge tube comprising an outer wall having a male taper shape with an outer diameter that decreases in a direction toward a tip of the drug discharge tube; and wherein, at least at a portion of the fitted wall at which an outer edge of the tip of the drug discharge tube contacts the fitted wall when the fitting portion is fitted to the drug discharge tube, a taper ratio of the female taper shape of the fitted wall is greater than 9/100. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification