Hypodermic needle assembly
First Claim
1. A hypodermic needle assembly comprising:
- a substantially rigid handle having a proximal end and a distal end;
an introducer needle at said distal end of said handle, said introducer needle including a sharp end projecting from said handle;
a rigid hollow cannula slidably engaged within said introducer needle, said cannula including a blunt end and at least one side port adjacent to said blunt end, said cannula being rigid enough to retain its shape while being used to administer a retrobulbar injection to the human eye;
means for preventing said cannula from projecting more than a selected distance beyond said sharp end of said introducer needle; and
means for withdrawing said cannula such that the blunt end thereof is entirely within said introducer needle.
1 Assignment
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Accused Products
Abstract
A hypodermic needle assembly is provided which may be used for retrobulbar injections. The assembly includes a substantially rigid handle, a short introducer needle mounted to the handle, a hollow, blunt-ended cannula mounted to the handle and slidable within the introducer needle, the cannula being mounted to the handle in such a manner that it cannot extend more than a selected distance beyond the end of the introducer needle. The cannula is mounted to a hub which is adapted for receiving a syringe. A plunger is mounted to the hub and includes an elongated body portion extending substantially parallel to the cannula. The plunger is engageable with two abutments formed within the housing for controlling the depth of insertion of the cannula within the body.
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Citations
17 Claims
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1. A hypodermic needle assembly comprising:
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a substantially rigid handle having a proximal end and a distal end; an introducer needle at said distal end of said handle, said introducer needle including a sharp end projecting from said handle; a rigid hollow cannula slidably engaged within said introducer needle, said cannula including a blunt end and at least one side port adjacent to said blunt end, said cannula being rigid enough to retain its shape while being used to administer a retrobulbar injection to the human eye; means for preventing said cannula from projecting more than a selected distance beyond said sharp end of said introducer needle; and means for withdrawing said cannula such that the blunt end thereof is entirely within said introducer needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hypodermic needle assembly comprising:
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a substantially rigid handle having a proximal end and a distal end, said handle including an elongated body portion having an upper surface and first and second abutment means extending from said upper surface; an introducer needle at said distal end of said handle, said introducer needle including a sharp end projecting from said handle; a hollow cannula slidably engaged within said introducer needle, said cannula including a blunt end and at least one side port adjacent to said blunt end; a hub secured to said cannula, a plunger secured to said hub, said plunger including an elongated body portion extending substantially parallel to said cannula, said plunger including a projection extending towards said upper surface and engageable with said first and second abutment means, whereby said cannula extends outside said introducer needle when said projection engages said first abutment means but not when said projection engages said second abutment means; means for preventing said cannula from projecting more than a selected distance beyond said sharp end of said introducer needle; and means for withdrawing said cannula such that the blunt end thereof is entirely within said introducer needle. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification