Blow molded venous drip chamber for hemodialysis
First Claim
1. A blow-molded, flexible plastic blood chamber for hemodialysis, said chamber defining an inlet blood port adjacent an end of the chamber, an outlet blood port adjacent an opposed end of the chamber, and a tubular plastic filter positioned in close-fitting relation adjacent said outlet port to project into said chamber, in which an inward projection is defined within said outlet port, said tubular plastic filter defining an outer end portion that carries a radially outwardly projecting, annular flange proportioned to slidingly pass through said outlet port and engaging said inward projection to limit inward travel of said filter to a predetermined, innermost position, plus means for retaining said filter in said position.
2 Assignments
0 Petitions
Accused Products
Abstract
A blow molded, rigid plastic venous chamber for hemodialysis, for use in a venous hemodialysis set. The chamber defines a plurality of first access ports adjacent to a first end thereof. A second access port is provided at an opposed end. A tubular plastic filter is positioned in close-fitting relation within the second access port to project into the chamber. Unique advantages are provided by such a blow-molded, filter-carrying chamber, and by the chamber shape.
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Citations
36 Claims
- 1. A blow-molded, flexible plastic blood chamber for hemodialysis, said chamber defining an inlet blood port adjacent an end of the chamber, an outlet blood port adjacent an opposed end of the chamber, and a tubular plastic filter positioned in close-fitting relation adjacent said outlet port to project into said chamber, in which an inward projection is defined within said outlet port, said tubular plastic filter defining an outer end portion that carries a radially outwardly projecting, annular flange proportioned to slidingly pass through said outlet port and engaging said inward projection to limit inward travel of said filter to a predetermined, innermost position, plus means for retaining said filter in said position.
- 8. A plastic, venous chamber for hemodialysis, having first and opposed ends said chamber defining a first access port adjacent an end of the chamber, a second access port adjacent an end of the chamber, and a tubular, plastic filter positioned in close-fitting relation with said second access port to project into said chamber, said first access port being positioned in separate, lateral relation to said chamber, and a lateral conduit extending from said first access port also in said separate, lateral relation, said conduit communicating with said chamber at a position between the first and opposed ends, and in which a portion of the chamber adjacent the chamber end opposed to the filter is relatively flat and wide in cross-section when compared with the portion of said chamber adjacent the end where said filter is located, and further in which an annular step is defined within said second access port, said filter defining an outer end portion that carries a radially, outwardly projection, an annular flange proportioned to slidingly pass through said second access port, but to engage said annular step to limit inward travel of said filter to a predetermined, innermost position.
- 14. A flow molded, flexible plastic blood chamber for hemodialysis, said chamber defining an inlet blood port adjacent an upper end of the chamber and an outlet blood port adjacent an end of the chamber, said inlet port being positioned in separate, lateral relation with said chamber and having a conduit extending longitudinally of said chamber from said inlet port toward the end of said chamber opposed to the inlet port end in said separate lateral relation to said chamber, said conduit curving into communication with said chamber in a transverse direction at a position between the ends of said chamber, a portion of said chamber opposed to the area of communication of said conduit and chamber defining a sloping surface to turn lateral blood flow across said chamber gently upwardly, to define a gentle, circulatory flow of blood in said chamber.
- 17. A flexible plastic blood chamber for hemodialysis, said chamber defining a first blood inlet port adjacent an upper chamber end, and an outlet blood port at an opposed lower chamber end, said inlet port being positioned in separate, lateral relation with said chamber, a conduit extending vertically from said inlet port toward said opposed end in said separate, lateral relation, which conduit curves to communicate with the interior of said chamber in horizontal direction at an inlet position between said upper and lower ends, a portion of said chamber horizonally opposite to the inlet position of said conduit and chamber defining a sloping surface to turn horizontal blood flow from said conduit across said chamber gently upwardly, back toward said upper end of the chamber, to define a gentle, circulatory flow of blood in said chamber, said chamber defining below said inlet position a portion of substantially circular cross-section.
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30. The method of removing gas bubbles from blood, which comprises:
- passing blood through an inlet port downwardly toward a chamber;
passing said blood into said chamber in a horizontal flow at a point spaced from the chamber ends;
causing horizontally flowing blood in said chamber to be directed upwardly by a an opposed, sloping surface within said chamber, to create a circulating flow of blood within said chamber; and
causing blood to flow out of said chamber through an outlet port at the bottom of said chamber. - View Dependent Claims (31, 32, 33)
- passing blood through an inlet port downwardly toward a chamber;
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34. The method of removing gas bubbles from blood, which comprises:
- passing said blood through a curved path into said chamber in horizontal flow at an inlet position spaced from the chamber ends, said chamber being partially filed with blood and having a blood level above said inlet position;
causing horizontally flowing blood from said inlet position in said chamber to be directed upwardly by a sloping surface within said chamber positioned below the main flow of said horizontally flowing blood, to create a circulating flow of blood within said chamber; and
causing blood to flow out of said chamber through an outlet port positioned below said inlet position. - View Dependent Claims (35, 36)
- passing said blood through a curved path into said chamber in horizontal flow at an inlet position spaced from the chamber ends, said chamber being partially filed with blood and having a blood level above said inlet position;
Specification