Subcutaneous injection set with improved cannula mounting arrangement
First Claim
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1. A subcutaneous injection set, comprising:
- a one piece housing defining an internal chamber adapted to receive a selected infusion fluid, and further defining a generally cylindrical support hub having an outlet bore formed therein and a generally annular seat surrounding said outlet bore at an upstream end thereof within said chamber;
a cannula having a base end defining a radially outwardly extending flange, said cannula being received within said outlet bore with said flange generally overlying said annular seat, said cannula protruding outwardly from said housing;
sealing means interposed between said flange and said annular seat; and
a radially inwardly extending annular lock rim swaged in the interior of said housing and overlying at least a portion of said flange to retain said flange in a position relative to said seat to compress said sealing means.
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Abstract
An improved subcutaneous injection set is disclosed which has a soft cannula for subcataneous delivery of a selected medication to a patient. The cannula is supported by and protrudes outwardly from a cylindrical support hub of a housing adapted to receive the selected medication. A flanged base end of the cannula is disposed within the housing and is captured by a swaged lock rim to retain a sealing gasket under compression against an annular seat within the support hub, thereby preventing leakage of the medication through the hub and about the exterior of the cannula.
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Citations
12 Claims
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1. A subcutaneous injection set, comprising:
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a one piece housing defining an internal chamber adapted to receive a selected infusion fluid, and further defining a generally cylindrical support hub having an outlet bore formed therein and a generally annular seat surrounding said outlet bore at an upstream end thereof within said chamber; a cannula having a base end defining a radially outwardly extending flange, said cannula being received within said outlet bore with said flange generally overlying said annular seat, said cannula protruding outwardly from said housing; sealing means interposed between said flange and said annular seat; and a radially inwardly extending annular lock rim swaged in the interior of said housing and overlying at least a portion of said flange to retain said flange in a position relative to said seat to compress said sealing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A subcutaneous injection set, comprising:
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a one piece housing defining an internal chamber adapted to receive a selected infusion fluid, and further defining a generally cylindrical support hub having an outlet bore formed therein and a generally annular seat surrounding said outlet bore at an upstream end thereof within said chamber; a cannula having a base end defining a radially outwardly extending flange, said cannula being received within said outlet bore with said flange generally overlying said annular seat, said cannula protruding outwardly from said housing; an annular sealing gasket interposed between said flange and said annular seat; and a lock rim swaged within said housing chamber in engagement with said flange to maintain said flange in a position with said sealing gasket retained compressively between said flange and said seat.
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10. A method of mounting a cannula to a housing in a subcutaneous injection set, wherein the housing defines an internal chamber adapted to receive a selected infusion fluid and a cylindrical support hub having an outlet bore formed therein, and further wherein the cannula has a base end defining an outwardly extending flange, said mounting method comprising the steps of:
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forming a generally annular seat in the housing in surrounding relation to an upstream end of the outlet bore within the housing chamber; mounting a sealing gasket about the cannula; installing the cannula within the outlet bore, with the sealing gasket interposed between the flange and the seat; and swaging a portion of the housing to form a lock rim in engagement with the flange, said swaging step securing the flange in a position within the housing chamber such that the sealing is compressively retired between the flange and the seat. - View Dependent Claims (11, 12)
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Specification