US2003155294A1PendingUtilityA1
Filter device, preferably a hollow fibre dialyser, comprising curled hollow fibres
Priority: Feb 17, 2000Filed: Feb 16, 2001Published: Aug 21, 2003
Est. expiryFeb 17, 2020(expired)· nominal 20-yr term from priority
B01D 61/28B01D 69/08B01D 2313/08B01D 69/00B01D 65/00B01D 69/084B01D 63/021B01D 63/031
40
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Claims
Abstract
The invention relates to a filter device, preferably for hemodialysis, that consists of a cylindrical filter housing and a bundle of curled hollow fibers. The bundle is arranged in the filter housing. According to the invention, the curled hollow fibers are provided with an essentially sinusoidal texture and a wavelength that is defined by means of certain limits. The invention also relates to a curled hollow fiber and a method for filling a hollow fiber dialyser.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . Filter device, preferably a hollow fiber dialyser for hemodialysis, consisting of a cylindrical filter housing and a bundle of curled hollow fibers arranged in it, characterized in that the hollow fibers have an essentially sinusoidal texture and are curled according to the following geometric pattern:
5
·
d
<
λ
<
L
12
·
1
1
+
2
D
L
,
(
1
)
whereby λ represents the wavelength of the curled hollow fiber,
d represents the outer diameter of the hollow fiber,
L represents the effective length of the hollow fiber, and
D represents the diameter of the fiber bundle.
2 . Filter device according to claim 1 , characterized in that amplitude a of the essentially sinusoidal curling results from the following equation:
d
5
<
a
<
λ
5
.
(
2
)
3 . Filter device according to claims 1 or 2 , characterized in that the curling of the hollow fiber has a three-dimensional position according to the following formula:
x
⇀
(
z
)
=
(
a
·
sin
(
2
π
z
λ
·
u
)
·
sin
(
2
π
z
λ
)
a
·
cos
(
2
π
z
λ
·
u
)
·
sin
(
2
π
z
λ
)
z
)
,
(
3
)
whereby the following is true:
0.05<u<0.14, and whereby
{overscore (χ)}(z) represents the space vector between the coordinate origin and the spatial position of a hollow fiber that extends along the z-axis, and
u represents the amount of rotations per wavelength λ.
4 . Filter device according to one of the claims 1 to 3 , characterized in that the fiber allocation in the cylindrical filter housing is 60.5% to 70%.
5 . Filter device according to one of the claims 1 to 4 , characterized in that the fiber allocation in the cylindrical filter housing is 60.5% to 67.5%.
6 . Filter device according to one of the claims 1 to 5 , characterized in that the fiber allocation in the cylindrical filter housing is between 63.5% and 65.5%.
7 . Filter device according to one of the claims 1 to 6 , characterized in that at least 10% of the hollow fibers are three-dimensional curled hollow fibers.
8 . Curled hollow fiber for optional use in the shape of a bundle in filter devices, preferably hollow fiber dialysers, which may have various diameters D, from a minimum diameter D MIN up to a maximum diameter D MAX , characterized in that the curled hollow fiber has only one curl for the use in filter housings of various diameters, resulting from the following equations:
5
·
d
<
λ
<
L
12
·
1
1
+
2
DMax
L
,
(
4
)
whereby λ represents the wavelength of the curled hollow fiber,
d represents the outer diameter of the hollow fiber,
L represents the effective length of the hollow fibers, and
D MAX represents the diameter of the fiber bundle for the fiber housing with the maximum interior diameter.
9 . Curled hollow fiber according to claim 8 , characterized in that the curling of the hollow fiber has a three-dimensional position according to the following formula:
x
⇀
(
z
)
=
(
a
·
sin
(
2
π
z
λ
·
u
)
·
sin
(
2
π
z
λ
)
a
·
cos
(
2
π
z
λ
·
u
)
·
sin
(
2
π
z
λ
)
z
)
,
(
3
)
whereby the following is true:
0.05<u<0.14, and whereby {overscore (χ)}(z) represents the space vector between the coordinate origin and the spatial position of a hollow fiber that extends along the z-axis, and u represents the amount of rotations per wavelength λ.
10 . Curled hollow fiber according to claims 8 or 9 , characterized in that it consists of 90 to 99 weight percent of a hydrophobic first polymer, and 10 to 1 weight percent of a hydrophilic second polymer, whereby the hydrophobic first polymers are selected from the following group: polyarylsulfons, polycarbonates, polyamides, polyvinyl chlorides, modified acrylic acid, polyether, polyurethane, or their co-polymers, and whereby the hydrophilic second polymers are selected from the following group: polyvinylpyrrolidon, polyethylene glycol, polyglycolmonoesther, co-polymers from polyethylene glycol with polypropylenglycol, water soluble derivatives of cellulose or polysorbates.
11 . Method for the filling of a filter device, especially a hollow fiber dialyser, according to one of the claims 1 to 7 , characterized in that the air present at the beginning of the filling operation in the exterior space, i.e., in the space surrounding the hollow fibers, is displaced by means of a fluid volume flow that is guided from top to bottom through the filter housing.
12 . Method according to claim 11 , characterized in that the fluid volume flow is approximately 500 ml/min.
13 . Use of a filter device according to one of the claims 1 to 7 for the filling of the filter housing by means of a fluid volume flow that is guided from top to bottom through the filter housing.Join the waitlist — get patent alerts
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