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US 4,411,783 AGranted
Arterial blood filter with improved gas venting
AssigneeShiley Incorporated
InventorsDuane D. Dickens, Francis M. Servas
Life of this patent
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AssigneeShiley Incorporated
InventorsDuane D. Dickens, Francis M. Servas
Estimating the term…
A novel liquid filter of the "outside-in" type is disclosed, comprising a hollow tubular housing, a concentrically disposed perforated tubular core surrounded by a cylindrical filter element and communicating with a liquid outlet in the bottom wall of the housing, and a filter element cap covering the upper ends of the perforated core and filter element. A gas vent is located at the highest point in the top wall of the housing, which is at the center of the top wall. The liquid inlet and filter element cap are designed to provide for establishment of a stable swirling flow outside the filter element and above the filter element cap. An improved means of bonding upper and lower cup-like portions together to form a hollow tubular housing with high resistance to rupture under pressure is also disclosed. The filter of the invention is particularly suited for use in extracorporeal blood flow circuits, most particularly as an arterial blood filter located downstream from a blood oxygenator.
A liquid filter suitable for use in an extracorporeal blood flow circuit comprising
In a hollow tubular housing comprising a plastic upper cup-like portion having a top wall, a downwardly-extending side wall and an open bottom end, secured to a plastic lower cup-like portion having a bottom wall, an upwardly-extending side wall and an open top end, the improvement wherein the lowermost portion of said upper portion includes inner and outer downwardly-extending annular rims defining a first annular groove between them, the uppermost portion of said lower portion includes inner and outer upwardly-extending annular rims defining a second annular groove between them, with said outer annular rim of said lower portion received within said first annular groove so as to leave a gap between said outer annular rim and the base of said first annular groove and with said inner annular rim of said upper portion received within said second annular groove so as to leave a gap between said inner annular rim and the base of said second annular groove, said two outer annular rims are bonded together by ultrasonic bonding and said outer upwardly-extending annular rim is bonded to said inner downwardly-extending annular rim by ultrasonic bonding,
Dependencies are inferred from the claim text.