EP4536382A1 - Beschichtung von hohlfasermembranen in der medizintechnik - Google Patents
Beschichtung von hohlfasermembranen in der medizintechnikInfo
- Publication number
- EP4536382A1 EP4536382A1 EP23729788.2A EP23729788A EP4536382A1 EP 4536382 A1 EP4536382 A1 EP 4536382A1 EP 23729788 A EP23729788 A EP 23729788A EP 4536382 A1 EP4536382 A1 EP 4536382A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow fiber
- fiber membrane
- coating material
- coating
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/02—Hollow fibre modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
- B01D69/106—Membranes in the pores of a support, e.g. polymerized in the pores or voids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/70—Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/28—Degradation or stability over time
Definitions
- the present invention relates to a method for coating a, preferably porous and/or hydrophilic, hollow fiber membrane with a coating material according to claim 1, a hollow fiber membrane according to claim 21, a dialyzer according to claim 22 and a device according to claim 23 or according to the preamble or generic terms of these claims.
- An object of the present invention is to provide a method for producing a hollow fiber membrane suitable for this treatment method.
- a method for coating a, preferably porous and/or hydrophilic, hollow fiber membrane with a coating material is proposed.
- the method according to the invention includes providing at least one hollow fiber membrane with a coating side to be coated and a secondary side opposite this, as well as providing the coating material.
- hollow fiber membrane here, what has been said in this regard also applies in some embodiments to a large number of mostly parallel hollow fiber membranes, which, for. B. bundled, for example in a common housing, for example the filter housing, approximately as shown in section in Fig. 2B of US 10,583,458 B2. They can be coated simultaneously using the present invention. If there are several hollow fibers or hollow fiber membranes, the coating side can correspond to the side facing the inner lumen of the hollow fiber; the secondary side would be the outer lateral surface of the hollow fibers, alternatively the entire space within the housing, which is formed by the inner walls of the housing and the outer lateral surfaces of the Hollow fibers are formed or (co-)limited.
- a dialyzer with a hollow fiber membrane according to the invention is proposed.
- the coating side may be the blood side in these or any other embodiments.
- a device for coating a hollow fiber membrane is proposed, which is configured to carry out the method according to the invention.
- the object according to the invention has one or more features in a specific embodiment, it is also disclosed here that the object according to the invention expressly does not have exactly this or these features in other embodiments also according to the invention, e.g. B. in the sense of a disclaimer.
- the opposite embodiment for example formulated as a negation, is also disclosed.
- the device according to the invention is configured in some embodiments to carry out one, several or all of these method steps, in particular if these are steps that can be carried out automatically, in any combination or corresponding devices, which are preferably based on the name of the respective method step (e.g. "determination” as a method step and “device for determining” for the device, etc.) and which can also be part of the device (s) according to the invention or be connected to it in a signal connection, to be controlled accordingly.
- the at least one hollow fiber membrane is arranged in a housing, such as a filter housing.
- the at least one hollow fiber membrane is arranged in the housing, or filter housing, of a dialyzer.
- the volume adjacent to or surrounding the side of the hollow fiber membrane that is not to be coated, also referred to herein as the secondary side, is in these embodiments preferably fluidically separated from an exterior of the housing or the dialyzer, e.g. B. by means of the housing.
- the housing can have fluid line connections such as the compressed gas inlet or compressed gas outlet mentioned below, but can otherwise be fluidically separated.
- the method of the invention further comprises exposing the hollow fiber membrane to centrifugal force during application of the coating material.
- the hollow fiber membrane has a longitudinal direction with two longitudinally opposite ends, referred to herein as the first and second ends, respectively, wherein the coating material is brought into contact with the hollow fiber membrane at the first end for its application to the hollow fiber membrane for coating thereof .
- the first end is or is placed closer to a rotation axis of the centrifugation than the second end.
- the hollow fiber membrane is held in or on a first holding device for its coating.
- the coating material is arranged in such a way that it moves along an inlet line, e.g. B. to be guided along the first holding device, for example through a lumen of the inlet line or the first holding device, to the first end of the hollow fiber membrane.
- the inlet line can run inside or outside the first holding device. It can be identical to the first holding device or part of it.
- the course of the inlet line has the height difference, or a part thereof.
- a height difference can be an inclination of the inlet pipe relative to a horizontal or can be caused by this.
- the inclination can refer to the entire inlet line, e.g. B. rising from bottom to top.
- the inclination can refer to a section of the inlet line in which the inlet line, e.g. B. in side view, S-shaped, curved, etc.
- the hollow fiber membrane is held in or on a second holding device for its coating.
- a drain line is arranged, via which excess coating material is removed along the drain line, e.g. B. along the second holding device, for example through a lumen of the inlet line or the second Holding device, via the second end of the hollow fiber membrane is removed from this.
- the drain line can run inside or outside the second holding device. It can be identical to the second holding device or part of it.
- first height difference (the inlet line) also applies in some embodiments to the second height difference (the outlet line), and vice versa.
- the inlet line and/or the outlet line have a first ventilation connection or a second ventilation connection through which gas is passively introduced into the inlet line during coating, e.g. B. as atmospheric air, can flow in or be actively supplied and / or gas can flow out passively or be actively removed from the drain line.
- the first ventilation connection and/or the second ventilation connection is in fluid communication with the inlet line or the outlet line in each case in the upper half of the cross section of the inlet line or the outlet line. This means that the gas is supplied or removed in the upper half of the cross section of the inlet line or the outlet line.
- the design and/or arrangement of the ventilation connections in the upper half of the inlet line or the outlet line can advantageously help prevent coating material from escaping via these ventilation connections while the centrifugal force acts on the coating material.
- an advantageous angle of inclination of at least 10° of the ventilation connections relative to the vertical or vertical e.g. B. inclined towards, or away from, the axis of rotation of the centrifuge.
- a purge gas is introduced into the hollow fiber membrane along the longitudinal direction of the hollow fiber membrane and in contact with the coating side to remove excess coating material from the
- the purge gas is introduced during centrifugation or during a time during which no or no longer centrifugation is taking place.
- the purging gas is introduced via a rotary feedthrough or by means of a line arranged according to the “Adams unique jump rope” principle.
- the purging gas can be introduced via a guide that is resistant to rotation during rotation.
- a rotary union allows fluids (gases, liquids) to pass in a sealed manner between a stationary body and a rotating body, or between bodies rotating in opposite directions.
- a sliding seal-free flow centrifuge having a line for supplying and/or discharging at least one fluid from the separation unit to a fixed connection point is disclosed, for example, in EP 0 933133 B1 from Fresenius AG, the relevant disclosure of which is incorporated herein by reference in its entirety.
- the blood flow can be achieved in an ultra-low flow process of e.g. B. less than 1000 ml/min or even less than 500 ml/min, but is not limited to this, so that treatment is “minimally invasive” compared to standard treatment (low-flow ECMO) because it uses a smaller catheter for vascular access than with ECMO, which is also used for dialysis (e.g. Shaldon catheter (11-13.5 Fr).
- Gas exchangers are usually manufactured in much smaller quantities than dialyzers. Their production therefore only has a low degree of automation. For this reason, gas exchangers are comparatively expensive to manufacture.
- An advantage of the present invention can therefore be that the coating process can be automated, i.e. in particular without human intervention. This can help save time and costs.
- a further advantage may be that a large number of coated dialyzers according to the invention can be produced, since several modules can be coated at the same time using the present invention. Since this can speed up the production of dialyzers suitable for gas exchange, this can also help save time and costs.
- a further advantage of the present invention can be that solvent from the coating material, which filters through the hollow fiber membrane towards the secondary side and evaporates there when coating the coating side, can escape from the housing. This means that solvent residues that would otherwise remain in the dialyzer housing can be avoided. This can also help to increase patient safety and optimize the quality of the coating.
- Fig. 2 shows an exemplary arrangement for carrying out the method according to the invention in an embodiment using a Device according to the invention in a first exemplary embodiment
- Fig. 4b shows the arrangement of Fig. 4a in a second position
- Fig. 5 shows the sequential principle of the anti-twist mechanism, also known as "Adam's unique jump rope"; and 6 shows an exemplary procedure within the framework of an embodiment of the method according to the invention, whereby only the expulsion of excess coating material B by introducing flushing gas S is described here.
- FIG. 1 shows an exemplary sequence of a method according to the invention for coating a, preferably porous and/or hydrophilic, hollow fiber membrane 1 with a coating material B in an exemplary embodiment.
- Method step M1 represents providing the hollow fiber membrane 1.
- the hollow fiber membrane 1 can be arranged in a housing, such as a filter housing 50, for example of a dialyzer, for example as shown in the following figures.
- the method step M3 includes that the hollow fiber membrane 1 is exposed to a centrifugal force during the application of the coating material B to one or at least one side of the hollow fiber membrane 1.
- the coating material B is preferably only brought into contact with the hollow fiber membrane 1 when the centrifugal force begins, represented by method step M4. This can include that the coating material B cannot come into contact with the hollow fiber membrane 1, for example, before the onset of the centrifugal force, or not before at least 10% of the later maximum value of the centrifugal force is reached. For this purpose, in some embodiments of the method it can be provided that the coating material B must first overcome a first height difference H1 in order to reach the first end 10 of the hollow fiber membrane 1.
- the drain line 75 is arranged and/or designed in such a way that the coating material B overcomes a second height difference H2 when flowing away from the second end 20 of the hollow fiber membrane 1, which results in a backflow of the coating material B to the second end 20 of the hollow fiber membrane 1 (after overcoming the second Height difference H2) prevented. It can be provided that the arrangement (see FIG. 2) of the drain line 75 or the design of the drain line 75 or its lumen (see FIG. 3) represents the second height difference H2 that has to be overcome for the coating material B.
- the inlet line 65 and/or the outlet line 75 can each have a ventilation connection 80, in particular in the upper half of the cross section which is in fluid communication with the ventilation connection 80, with gas being supplied into the inlet line 65 during coating and/or where Gas is discharged from the drain line 75.
- a purge gas S is introduced in the longitudinal direction L into the hollow fiber membrane 1 along the coated side in order to displace excess coating material B from the hollow fiber membrane 1.
- This step can be done during centrifugation, i.e. H. while the centrifuge is still running and a centrifugal force is still acting.
- the purge gas S can be supplied via an optional rotary feedthrough at the ventilation connection 80 or a line, which is optionally arranged at the ventilation connection 80 according to the “Adams unique jump rope” principle.
- FIG. 2 shows an exemplary arrangement for carrying out the method according to the invention in one embodiment using a device 100 according to the invention in a first exemplary embodiment.
- At least one, preferably porous and/or hydrophilic, hollow fiber membrane 1 is arranged in a filter housing 50. It has a longitudinal direction L with two ends 10, 20 opposite one another in the longitudinal direction L. At its first end 10, the hollow fiber membrane 1 is connected to a first holding device 60. The hollow fiber membrane 1 is fluidly connected to an inlet line 65. In this feed line 65, at least at the beginning of the method according to the invention, a coating material B, which can be or comprise silicone or a silicone solution, is provided. At its second end 20, the hollow fiber membrane 1 is optionally connected to a second holding device 70. The hollow fiber membrane 1 is optionally fluidly connected to a drain line 75. The drain line 75 will be discussed in more detail below.
- the device 100 shown is now rotated about an axis of rotation R, i.e. here, for example, in a plane which is perpendicular to the plane of the drawing, with the first end 10 being arranged closer to the axis of rotation R than the second end 20, a centrifugal force acts on the in the coating material B provided to the inlet line 65 and presses it outwards and upwards against the first end 10 of the hollow fiber membrane 1.
- This is shown by the upward-pointing white block arrow in FIG on the right side shows, one at the first end 10, one at the beginning of the feed line 65.
- the coating material B continues to find its way along the coating side of the hollow fiber membrane 1 and through the filter housing 50 to the second end 20. Part of the coating material B remains as a coating on the coating side of the hollow fiber membrane 1. Coating material B that is not required for this purpose, i.e. excess coating material B, is pressed by means of the centrifugal force over the second end 20 of the hollow fiber membrane 1 and the second holding device 70 into the drain line 75 and is advantageously collected there. This is represented by the white block arrow pointing downwards.
- the inlet line 65 is arranged and/or designed to rise from bottom to top.
- the coating material B in order to reach the first end 10 of the hollow fiber membrane 1 from the right (e.g. from a container or a source) in FIG. 2, the coating material B must first overcome a first height difference H1. For example, a minimum flow is required - and thus a minimum filling height regarding the coating material B - and / or a minimum centrifugal force so that the coating material B can get into the clamped hollow fiber membrane 1. This advantageously prevents the coating material B from coming into contact with the hollow fiber membrane 1 before the device 100 starts rotating.
- the drain line 75 is arranged and/or designed to slope down from top to bottom.
- the coating material B emerges from the second end 20 of the hollow fiber membrane 1, it initially overcomes a second height difference H2. This advantageously prevents the coating material B from flowing back to or into the hollow fiber membrane 1 when the rotation of the device 100 is slowed down or stopped.
- the inlet line 65 further has a first ventilation connection 80 on its upper cross section
- the outlet line 75 also has a second ventilation connection 90 on its upper cross section.
- gas e.g. B. as atmospheric air
- flow in or actively e.g. B. as purge gas S as designated in Fig. 6, and / or gas passively flows out of the drain line 75 through the second ventilation connection 90 or is actively removed.
- the arrangement and fluidic connection of the ventilation connections 80, 90 with the inlet line 65 and the outlet line 75 in each case in the upper half of the cross section can advantageously help prevent coating material B from escaping via these ventilation connections 80, 90 while the centrifugal force acts on the coating material B .
- the possibility of passive ventilation can serve to avoid negative pressure, which could make it more difficult for coating material B to flow in the direction of the hollow fiber membrane 1.
- the possibility of active ventilation can serve to expel excess coating material B from the hollow fiber membrane 1.
- a control device 101 for carrying out the method and/or for controlling and/or regulating the device 100 is arranged next to it. This can be or include controlling or regulating the centrifugation, the introduction of the coating material B, the gas, the flushing gas S and/or the compressed gas D (see FIG. 6), in particular as described herein.
- FIG. 2a shows a characteristic curve diagram determined in the experiment, which can help in designing the construction of the device 100 according to the invention in FIG. 2.
- the distance radius r of the working point A from the rotation axis R is noted on the x-axis in the unit millimeters [mm], and on the y-axis the inclination angle of the inlet pipe in degrees [°].
- the characteristic curves shown K1 to result For different rotation speeds in the unit revolution per minute [rpm], the characteristic curves shown K1 to result
- Fig. 2b shows an exemplary arrangement of the
- the height differences H1 and H2 also serve the purpose stated in FIG. 2 in the embodiment of FIG. 3.
- the hollow fiber membrane 1 in the housing 50 is held in a first, here upright, position before centrifugation, and placed on a container with coating material B and fluidly connected to it.
- the container can function as an inlet line 65 and have a first ventilation connection 80.
- Figure 4b is supplemented by a drain line 75 at the second end 20 of the hollow fiber membrane 1, which was omitted from Figure 4a for reasons of space.
- the drain line 75 has a second ventilation connection 90, which in this arrangement is preferably arranged in the lower cross section of the drain line 75 in order to prevent coating material B from escaping during centrifugation.
- the hollow fiber membrane 1 can come into contact or come into contact for the first time with the coating material B, for example at its first end.
- the hollow fiber membrane 1 is arranged more upright or vertically in the first position than in the second position.
- Fig. 5 shows a sketch of the sequential principle of the anti-rotation mechanism.
- the rotating disk was marked with an arrow and the front and back of the "rope" were each contrasted differently from one another.
- the arrangement in a corresponds to the arrangement when the disk rotates by 0°, in b by 90°, in c from 180° etc. to i from 720°. It can be seen from the figure that the Arrangement at 0° (a) corresponds to the arrangement at 720° (i), i.e. the “rope” is not twisted any further.
- the disk, or other rotating structure can be non-rotatably connected on its top side to the “rope”, a band, a cord, a line, or the like in a first connection point, while the “rope” is on the underside (or vice versa).
- the disk rotating around its longitudinal axis during use is stationary with z.
- a stationary housing section, directly or indirectly the footprint on the floor, etc. is connected in a second connection point.
- the “rope” is guided at least in sections past a peripheral surface of the disc between these two connection points without being connected to the peripheral surface of the disc.
- Fig. 6 shows an exemplary procedure within the framework of an embodiment of the method according to the invention, whereby only the expulsion of excess coating material B by introducing flushing gas S is described here, a process that follows or completes the actual coating.
- a compressed gas outlet 95 for the compressed gas D is shown in FIG. 6 downstream of the compressed gas inlet 85.
- the compressed gas outlet 95 is not closed. It can, as also shown as an example in FIG. 6, with be provided with a flow-limiting or slowing element, which here z. B. is designed as a throttle 97.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- External Artificial Organs (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022114273.6A DE102022114273A1 (de) | 2022-06-07 | 2022-06-07 | Beschichtung von Hohlfasermembranen in der Medizintechnik |
| PCT/EP2023/065066 WO2023237523A1 (de) | 2022-06-07 | 2023-06-06 | Beschichtung von hohlfasermembranen in der medizintechnik |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4536382A1 true EP4536382A1 (de) | 2025-04-16 |
Family
ID=86732830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23729788.2A Pending EP4536382A1 (de) | 2022-06-07 | 2023-06-06 | Beschichtung von hohlfasermembranen in der medizintechnik |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4536382A1 (de) |
| DE (1) | DE102022114273A1 (de) |
| WO (1) | WO2023237523A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0810591A (ja) * | 1994-07-05 | 1996-01-16 | Toray Ind Inc | 中空糸膜端部コーティング方法 |
| JPH0819729A (ja) * | 1994-07-06 | 1996-01-23 | Toray Ind Inc | 中空糸膜コーティング装置 |
| DE19803534C2 (de) | 1998-01-30 | 1999-11-11 | Fresenius Ag | Zentrifuge und Leitung zum Zuführen und/oder Abführen mindestens eines Fluids von der Separationseinheit einer Zentrifuge zu einer ortsfesten Anschlußstelle |
| DE10034098C2 (de) | 2000-07-13 | 2002-11-21 | Fresenius Medical Care De Gmbh | Hydrophobe mikroporöse Hohlfasermembran und Verfahren zur Herstellung dieser Membran sowie deren Verwendung in der Membranoxygenierung |
| JP2005334850A (ja) * | 2004-05-31 | 2005-12-08 | Toyobo Co Ltd | 中空糸膜束の洗浄方法および洗浄装置 |
| US10583458B2 (en) | 2016-12-04 | 2020-03-10 | Hasan Farrokhzad | Methods and systems for coating hollow fiber membrane contactors |
| DE102021116764B4 (de) | 2021-06-30 | 2023-06-07 | Rheinisch-Westfälische Technische Hochschule Aachen, Körperschaft des öffentlichen Rechts | Verfahren zur Beschichtung einer Stoffaustauschvorrichtung |
-
2022
- 2022-06-07 DE DE102022114273.6A patent/DE102022114273A1/de active Pending
-
2023
- 2023-06-06 WO PCT/EP2023/065066 patent/WO2023237523A1/de not_active Ceased
- 2023-06-06 EP EP23729788.2A patent/EP4536382A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023237523A1 (de) | 2023-12-14 |
| DE102022114273A1 (de) | 2023-12-07 |
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Owner name: FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH |