Filter system for a closed fluid-transfer system with pressure equalization

Patent metadata

Field	Value
Publication number	US-12396925-B2
Application number	US-202118018826-A
Country	US
Kind code	B2
Filing date	Aug 18, 2021
Priority date	Aug 20, 2020
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A filter system for a closed fluid transfer system with pressure equalization. The filter system includes a filter having a main flow direction for a fluid passing through the filter extending from a fluid inlet surface to a fluid outlet surface, and a filter housing. The filter has a greater or at least equal extension in the main flow direction compared to at least one direction transverse to the main flow direction.

First claim

The invention claimed is:

1. A filter system for a closed fluid transfer system with pressure equalization, the filter system comprising:
a filter having a main flow direction for a fluid passing through the filter, the main flow direction extending along a fluid flow pathway from a fluid inlet surface to a fluid outlet surface; and
a filter housing,
the filter having a measured thickness and being constructed such that the length of the fluid flow pathway through the filter is greater than the measured thickness of the filter,
the filter housing comprising a filter receptacle,
the filter being held in the filter receptacle by a filter cover, and
the filter cover comprising an opening through which a fluid passing through the filter may be discharged to an environment located on the side of the filter cover facing away from the filter.

2. The filter system according to claim 1 ,
wherein the filter cover abuts, at least in portions, against a surface of the filter that is substantially perpendicular to the main flow direction of the fluid passing through the filter, or
wherein the filter cover abuts, at least in portions, against a surface of the filter that is substantially parallel to the main flow direction of the fluid passing through the filter.

3. The filter system according to claim 1 , wherein the filter is surrounded, at least in portions, by a support element in a direction substantially parallel to the main flow direction of the fluid passing through the filter, the support element being elastically deformable.

4. The filter system according to claim 3 , wherein the support element extends from an end of the filter facing away from the filter cover over a length of 1 mm to 15 mm.

5. The filter system according to claim 1 ,
wherein the filter has an extension of at least 2 mm and at most 15 mm in the main flow direction of the fluid passing through the filter, and/or
wherein the filter has a volume of at least 60 mm 3 and at most 400 mm 3 .

6. The filter system according to claim 1 , wherein the filter system is non-detachably connectable to the closed fluid transfer system.

7. The filter system according to claim 1 , wherein the filter is surrounded rotationally symmetrically in a radial direction with respect to the main flow direction of the fluid passing through the filter by a filter receptacle of the filter housing, and/or a filter cover, which abuts at least in portions against a surface of the filter that is substantially perpendicular to the main flow direction of the fluid passing through the filter, and/or an elastically deformable support element.

8. The filter system according to claim 1 , wherein the filter is configured such that the fluid flow pathway through the filter is longer than a dimension of the filter in the main flow direction of the fluid passing through the filter.

9. The filter system according to claim 1 , wherein the filter comprises at least two filter layers extending substantially perpendicular to the main flow direction.

10. The filter system according to claim 9 , wherein the filter or at least one of the at least two filter layers comprises a deflecting structure.

11. The filter system according to claim 9 , wherein the at least two filter layers comprise at least two successive filter layers having a fabric structure, each of which is offset relative to the other.

12. The filter system according to claim 1 ,
wherein the filter is configured as a cylindrical solid body, or
wherein the filter is configured as a hollow body comprising at least one opening into the hollow body.

13. The filter system according to claim 1 , wherein the filter is configured as a hollow cylinder having a longitudinal axis.

14. The filter system according to claim 13 ,
wherein the filter is provided with at least one fluid opening for fluid inflow into the hollow cylinder, forming at least one fluid inlet surface,
wherein the filter is provided with at least one fluid opening for fluid outflow from the hollow cylinder, forming at least one fluid outlet surface, and
wherein the at least one fluid inlet surface and/or the at least one fluid outlet surface of the hollow cylinder are configured such that the main flow direction is either only radial from an inner wall of the hollow cylinder, or only axial along and parallel to the longitudinal axis of the hollow cylinder, or combined both radial and axial.

15. The filter system according to claim 14 , wherein an inner wall of the hollow cylinder parallel to the longitudinal axis of the hollow cylinder is configured, at least in portions, as the at least one fluid inlet surface and/or the at least one fluid outlet surface.

16. The filter system according to claim 1 , wherein the filter is hydrophobic.

17. The filter system according to claim 1 ,
wherein the filter housing is sealed such that smoke is not released outside of the filter housing when smoke-forming TiCl 4 is introduced in the filter housing, and/or
wherein up to at least 200 ml of smoke-forming TiCl 4 can be absorbed by the filter.

18. The filter system according to claim 1 further comprising a withdrawal spike,
wherein the withdrawal spike is configured to withdraw medical fluids from medical containers as part of a medical fluid transfer system,
wherein the withdrawal spike comprises a piercing mandrel with a vent channel, and
wherein the filter system is flow-connected to the vent channel.

19. The filter system according to claim 18 ,
wherein the withdrawal spike further comprises a liquid channel, and the liquid channel is flow-connected to a liquid filter, and/or
wherein the withdrawal spike further comprises an additional air filter and/or liquid filter flow-connected to the vent channel.

20. The filter system according to claim 19 ,
wherein the additional air filter and/or liquid filter is arranged between the filter and the vent channel, and/or
wherein the additional air filter and/or liquid filter is held in a positionally fixed manner in the withdrawal spike by the filter.

21. The filter system according to claim 1 , further comprising a medical fluid transfer system for transferring medical fluids from one medical container to another medical container.

22. The filter system according to claim 1 , wherein the filter is an activated carbon filter.

Assignees

• Braun Melsungen Ag

Inventors

• Berg Karl Martin
• Sikhile Varaprasad
• Kopp Florin

Classifications

• B01D2275/10

  Multiple layers · CPC title

• B01D2271/02

  Gaskets, sealings · CPC title

• B01D46/24

  Particle separators, e.g. dust precipitators, using rigid hollow filter bodies · CPC title

• B01D46/0036

  by adsorption or absorption · CPC title

• B01D46/0012

  In-line filters · CPC title