Corrosive protected hypodermic module
First Claim
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1. A corrosive protected hypodermic module comprising:
- a cylindrical barrel open at its forward end,a pierceable seal across said forward end of said barrel,a piston in said barrel in slidable sealed relation to the interior wall of the barrel,said barrel, between said pierceable seal and said piston defining a medicament chamber,said piston having a longitudinal bore therein,a pierceable diaphragm across the forward end of said bore, sealing the bore from said medicament chamber,and a tissue piercing needle supported in said bore behind the pierceable diaphragm and longitudinally slidable in said bore.
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Abstract
A hypodermic injection device including an injector and a medicament and needle ampule wherein the needle is initially isolated from a possibly corrosive medicament, but wherein the needle is movable to a position in flow communication with the medicament only at the moment of injection, and an injector device into which the ampule can be loaded under controlled conditions of needle entry force and depth, medicament entry into tissue being accomplished while the needle is moving in its penetration of tissue.
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Citations
18 Claims
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1. A corrosive protected hypodermic module comprising:
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a cylindrical barrel open at its forward end, a pierceable seal across said forward end of said barrel, a piston in said barrel in slidable sealed relation to the interior wall of the barrel, said barrel, between said pierceable seal and said piston defining a medicament chamber, said piston having a longitudinal bore therein, a pierceable diaphragm across the forward end of said bore, sealing the bore from said medicament chamber, and a tissue piercing needle supported in said bore behind the pierceable diaphragm and longitudinally slidable in said bore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification