Method for insert molding a shielding plate into a housing portion of an access port

Abstract

A method for insert molding a shielding plate into a housing portion of an access port includes the steps of: positioning the shielding plate on a first corepin of a mold tool having a cavity, clamping the shielding plate between the first corepin and a second corepin of the mold tool, injecting plastic into the cavity so as to fill the cavity, and retracting the second corepin to create a void and subsequently injecting more plastic so as to fill the void. The molded housing portion of the access port forms a reservoir for receiving fluid. The housing portion includes an open end in which a septum is arranged, an exit passage, and a wall. The shielding plate includes a circular portion having a periphery. An annular region of the shielding plate has a bent portion with an axially extending portion formed on the annular region.

1 . A method for insert molding a shielding plate into a housing portion of an access port, the housing portion forming a reservoir for receiving fluid, the reservoir having a central axis, the housing portion comprising an open end in which a septum is arranged, an exit passage, and a wall, the shielding plate comprising a lower side and a circular portion having a periphery, an annular region of the shielding plate having a bent portion with an axially extending portion, the method comprising the steps of:
 positioning the shielding plate on a first corepin of a mold tool having a cavity;   clamping the shielding plate between the first corepin and a second corepin of the mold tool;   injecting plastic into the cavity so as to fill the cavity, and   retracting the second corepin to create a void and subsequently injecting more plastic so as to fill the void, wherein   the lower side and the periphery of the shielding plate are embedded into the housing portion,   the annular region of the shielding plate is embedded on all of its sides into the housing portion, and   the bent portion is embedded on all of its sides into the housing portion.   
     
     
         2 . The method according to  claim 1 , wherein the shielding plate is metallic or ceramic. 
     
     
         3 . The method according to  claim 1 , wherein the bent portion is formed all around the annular region. 
     
     
         4 . The method according to  claim 1 , wherein the bent portion comprises at least one extension extending from a portion of the annular region, and which is embedded on all of its sides into the housing portion. 
     
     
         5 . The method according to  claim 4 , wherein the at least one extension is directed parallel to the central axis of the reservoir. 
     
     
         6 . The method according to  claim 4 , wherein the at least one extension is inclined towards the central axis of the reservoir. 
     
     
         7 . The method according to  claim 4 , wherein the at least one extension extends along the entire axial length of the wall. 
     
     
         8 . The method according to  claim 4 , wherein at least one recess is formed on the circular portion laterally beyond the at least one extension. 
     
     
         9 . The method according to  claim 1 , wherein the periphery of the circular portion has a maximum diameter that is greater than a maximum internal diameter of the reservoir. 
     
     
         10 . The method according to  claim 1 , wherein the circular portion comprises an upper side that is concave.