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US 4,267,053 AGranted
Inline intravenous final filter unit
AssigneesAsahi Kasei Kogyo Kabushiki Kaisha, Morishita Pharm.
InventorsYasuo Hashino, Fusakazu Hayano, Kazuo Toyomoto
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AssigneesAsahi Kasei Kogyo Kabushiki Kaisha, Morishita Pharm.
InventorsYasuo Hashino, Fusakazu Hayano, Kazuo Toyomoto
Estimating the term…
An inline intravenous final filter unit especially of the bacteria-retentive type and adapted to be incorporated in administering sets for administering infusion solutions to patients. The filter unit comprises a casing having an inlet cap at its one end and an outlet cap at the other end thereof, at least one porous hollow fiber arranged within the casing in parallel to the longitudinal direction thereof and having a porosity rating of 0.1 to 5.mu., the hollow fiber being closed at its one end opposed to the inlet cap and open at the other end thereof opposed to the outlet cap, the hollow fiber further being tightly fixed at the outer peripheral portion of its open end to the inner wall of the casing by a securing member, and the ratio of the total effective filtration area of the hollow fiber to the capacity of the casing being at least about 4:1.
A method for removing bacteria and fungi from an infusion solution in an inline intravenous final filter unit which includes a casing having an inlet at one end and an outlet at the other end thereof which comprises:
An inline intravenous final filter unit including a casing having an inlet cap at its one end and an outlet cap at the other end thereof, a plurality of tubed filter elements arranged within the casing parallel to the longitudinal direction thereof, each of said tubed filter elements being closed at one end thereof opposed to the inlet cap and open at the other end thereof opposed to the outlet cap and a securing member for tightly fixing each of said tubed filter elements at the outer peripheral portion of each open end thereof to the inner wall of the casing wherein each of said tubed filter elements comprises porous hollow fiber of up to 3 mm in outside diameter and at least 0.5 mm in inside diameter, said porous hollow fiber having a porosity of 80-90% so as to be free from clogging by particulate matter in infusion solutions, a porosity rating of 0.1-0.5.mu. so as to suitable for the removal of bacteria or fungi contaminated thereinto and including a total effective filtration area of 5-100 cm.sup.2 and wherein the ratio of the total effective filtration area to the capacity of the casing is at least about 4:1.
Dependencies are inferred from the claim text.