Subcutaneous injection set with improved cannula mounting arrangement
First Claim
Patent Images
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.
8 Assignments
0 Petitions
Accused Products
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.
998 Citations
12 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. 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; 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.
-
-
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:
-
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)
-
Specification