Injection site having thermoplastically sealed injection port
First Claim
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1. An injection site for a parenteral fluid delivery system, comprising:
- an injection branch of the injection site having a main bore therethrough, said main bore having an outside end and a fluid outlet;
an elastomeric injection port plug having an outside surface including an outside surface of a wall penetrable by a hypodermic needle, said port plug having an annular outwardly projecting boss, said annular outwardly projecting boss being spaced from said outside surface to form an annular step between said outside surface and said boss of the port plug;
a fluid passageway branch of the injection site, said fluid passageway branch having a passageway that opens into said main bore of the injection branch at a location between said injection port plug and said fluid outlet of the main bore of the injection branch;
a thermoplastic seat at said outside end of said main bore of the injection branch, said seat being generally complementary to the outside surface of said injection port plug and said injection port plug being within said seat; and
said seat having a seal overlying said annular step of the port plug for encapsulation of said injection port plug except for at least part of said outside surface of the plug, said seat seal being formed by a horn for imparting vibratory energy to said outside end of the main bore of the injection branch, said seat seal including substantially the entirety of said outside end of the main bore.
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Abstract
Injection sites are provided for injecting substances such as medicaments into systems that are feeding parenteral fluid to a patient, which injection sites have injection ports that are thermoplastically sealed into the injection site in a manner that is simpler, faster, less expensive, and more readily automated than other assemblies. The assembly includes a vibratory energy seal of the non-thermoplastic port within a countersunk thermoplastic seat.
170 Citations
17 Claims
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1. An injection site for a parenteral fluid delivery system, comprising:
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an injection branch of the injection site having a main bore therethrough, said main bore having an outside end and a fluid outlet; an elastomeric injection port plug having an outside surface including an outside surface of a wall penetrable by a hypodermic needle, said port plug having an annular outwardly projecting boss, said annular outwardly projecting boss being spaced from said outside surface to form an annular step between said outside surface and said boss of the port plug; a fluid passageway branch of the injection site, said fluid passageway branch having a passageway that opens into said main bore of the injection branch at a location between said injection port plug and said fluid outlet of the main bore of the injection branch; a thermoplastic seat at said outside end of said main bore of the injection branch, said seat being generally complementary to the outside surface of said injection port plug and said injection port plug being within said seat; and said seat having a seal overlying said annular step of the port plug for encapsulation of said injection port plug except for at least part of said outside surface of the plug, said seat seal being formed by a horn for imparting vibratory energy to said outside end of the main bore of the injection branch, said seat seal including substantially the entirety of said outside end of the main bore. - View Dependent Claims (2, 3, 4, 5)
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6. In an improved parenteral fluid delivery system including a parenteral fluid storage container;
- a needle;
an injection site having an parenteral fluid inlet, an injection branch having a main bore therethrough for passing a supplementary fluid into the injection site, and a fluid outlet opening into both the parenteral fluid inlet and the branch; and
tubing communicating the storage container with the parenteral fluid inlet and communicating the fluid outlet with the needle;
the improvement comprising;an elastomeric injection port plug having an outside surface including an outside surface of a wall penetrable by a hypodermic needle, said port plug having an annular outwardly projecting boss, said annular outwardly projecting boss being spaced from said outside surface to form an annular step between said outside surface and said boss of the port plug; a thermoplastic seat at the outside end of said main bore of the injection branch, said seat being generally complementary to the outside surface of said injection port plug and said injection port plug being within said seat; and said seat having a seal overlying said annular step of the port plug for encapsulation of said injection port plug except for at least part of said outside surface of the plug, said seat seal being formed by a horn for imparting vibratory energy to said outside end of the main bore of the injection branch, said seat seal including substantially the entirety of said outside end of the main bore. - View Dependent Claims (7, 8, 9, 10)
- a needle;
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11. A method of constructing injection sites for patenteral fluid delivery systems, comprising:
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providing an elastomer injection port plug member with an outside surface of a wall penetrable by a hypodermic needle and with an outwardly extending annular boss spaced from said outside surface to form an annular step between said outside surface and said boss; forming a thermoplastic seat within an injection branch of an injection site having a main bore with an outside end and a fluid outlet therethrough and having a fluid passageway branch opening into said main bore at a location between said injection port plug member and said fluid outlet, said seat being generally complementary to the outside surface of the injection port plug member; inserting the injection port plug member into the thermoplastic seat; and encapsulating the injection port plug member except for at least part of the outside surface of the plug member, said encapsulating step including imparting vibratory energy to the outside end of the main bore of the injection branch until said outside end overlies the annular step of the port plug and until said seat seal includes substantially tne entirety of said outside end of the main bore. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification