Blood treatment filter

Abstract

A blood treatment filter comprising a filter element, an inlet-side flexible container and an outlet-side flexible container, an inlet port, and a tubular outlet port, further comprises: an outlet-side frame sheet disposed between the filter element and the outlet-side flexible container; a first seal portion provided by sealing at least the filter element and the outlet-side frame sheet in a belt-shaped manner; and an annular second seal portion provided to surround the first seal portion, wherein on an outlet side of the filter element, a valley portion is formed at the first seal portion, the outlet port includes a protruding portion that protrudes to an inside of the container, and the protruding portion is provided with an opening at least a part of which overlaps with the first seal portion and which can communicate with a gap region formed by the valley portion.

1 . A blood treatment filter comprising:
 an inlet-side container member and an outlet-side container member that are sealed;   a filter element, which filters blood, interposed between the inlet-side container member and the outlet-side container member and filtering blood;   an inlet port provided toward the inlet-side container member side with respect to the filter element;   a tubular outlet port provided toward the outlet-side container member side with respect to the filter element, wherein blood introduced from the inlet port is discharged from the outlet port;   an outlet-side frame sheet disposed between the filter element and the outlet-side container member;   an annular first seal portion defined by at least the filter element and the outlet-side frame sheet being adhered to each other; and   an annular second seal portion defined by the inlet-side container member, the outlet-side frame sheet, and the outlet-side container member being adhered to each other, and the outlet port being adhered to the outlet-side frame sheet and the outlet-side container member at a position where the outlet port penetrates an outer peripheral edge of the blood filter with respect to a plan view of the blood filter,   the annular second seal portion surrounding the annular first seal portion with respect to the plan view,   wherein on an outlet side of the filter element, the filter element and the outlet-side frame sheet are compressed in the first seal portion to form a valley portion that is spaced apart from the outlet-side container member,   the outlet port includes a protruding portion that is spaced apart from the valley portion and is provided with an opening at least a part of which is adjacent to the valley portion.   
     
     
         2 . The blood treatment filter according to  claim 1 ,
 wherein the valley portion includes a bottom portion overlapping the first seal portion, an internal slope portion rising from the bottom portion toward an inside of the first seal portion, and an external slope portion rising from the bottom portion toward an outside of the first seal portion.   
     
     
         3 . The blood treatment filter according to  claim 2 , wherein the external slope portion is formed from a protruding nonwoven fabric. 
     
     
         4 . The blood treatment filter according to  claim 1 , wherein the protruding nonwoven fabric includes an end located between the first seal portion and the outlet-side container member with respect to the plan view. 
     
     
         5 . The blood treatment filter according to  claim 4 , wherein the outlet port includes an internal opening formed on an end of the outlet port, and
 wherein at least a portion of the internal opening overlaps the first seal portion with respect to the plan view.