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WO2009068667A2 - Collecting container for wound exudate - Google Patents

Collecting container for wound exudate Download PDF

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Publication number
WO2009068667A2
WO2009068667A2 PCT/EP2008/066467 EP2008066467W WO2009068667A2 WO 2009068667 A2 WO2009068667 A2 WO 2009068667A2 EP 2008066467 W EP2008066467 W EP 2008066467W WO 2009068667 A2 WO2009068667 A2 WO 2009068667A2
Authority
WO
WIPO (PCT)
Prior art keywords
collecting container
fibres
fluid collecting
fluid
layer
Prior art date
Application number
PCT/EP2008/066467
Other languages
French (fr)
Other versions
WO2009068667A3 (en
Inventor
Brian Nielsen
Klaus Budig
Original Assignee
Coloplast A/S
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Coloplast A/S filed Critical Coloplast A/S
Publication of WO2009068667A2 publication Critical patent/WO2009068667A2/en
Publication of WO2009068667A3 publication Critical patent/WO2009068667A3/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/71—Suction drainage systems
    • A61M1/78—Means for preventing overflow or contamination of the pumping systems
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/60—Containers for suction drainage, adapted to be used with an external suction source
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
    • A61M1/98—Containers specifically adapted for negative pressure wound therapy

Definitions

  • the present invention generally relates to negative pressure systems, i.e. suction systems, for removal of fluids from a wound and thus for enhancing wound healing.
  • negative pressure systems i.e. suction systems
  • Such systems may comprise a wound cover which is attachable to a wound circumference of a living being to form an enclosure, and a pump in fluid communication with the enclosure to provide a pressure difference between a negative pressure in the enclosure and an air pressure of an ambient space.
  • a fluid collecting container is provided for collecting wound exudate, including fluid drawn from the wound.
  • Collecting containers for wound exudate may be provided with a filter at their outlet to allow gasses to escape from the containers. It is desirable to avoid that collected fluid or solid matter blocks such filters before the container is full, even when the canister is turned upside down. For this reason, collecting containers are often discharged before they have reached their maximum capacity. This results in increased costs and increased waste.
  • Blocked filters may result in an alarm being emitted by a control system for controlling operation of a wound drainage system, however it is desirable to minimise the number of alarms.
  • US 6,648,862 discloses a fluid trapping agent in a chamber of a desiccator cartridge.
  • the fluid trapping agent may include a pillow shape absorbing material with fibrous surfaces.
  • a flow channel with holes is provided to separate gas from fluid. When drained fluid and gas enter the flow channel, gas continues through the flow channel, while liquid drips through the holes, whereafter they are trapped in the trapping agent. Filters may be placed at the end of the flow tube.
  • the invention provides a system for draining fluid from a wound, comprising : - a suction source for providing a negative pressure to the wound to draw exudate from the wound;
  • the fluid collecting container for collecting fluid conveyed through the drainage conduit, the fluid collecting container comprising an inlet port and an outlet port; wherein the fluid collecting container is essentially filled with an absorbent fibrous material.
  • the fibres are preferably arranged to absorb liquid and solid particles and to allow gasses to pass through the fibres.
  • the invention provides a fluid collecting container for a system according to the first aspect of the invention, comprising an inlet port and an outlet port, wherein the fluid collecting container is essentially filled with an absorbent fibrous material.
  • the fluid flow path in or through the fluid collecting container is through the fibrous material in such a way that exudate, including fluid, gas and particles come in direct contact with the fibres.
  • exudate including fluid, gas and particles come in direct contact with the fibres.
  • preferred embodiments of the present invention ensure that any fluids and solid particles are trapped, thereby reducing the risk of contamination of filters at the outlet port.
  • a flow distribution channel may be provided at the inlet of the fluid collecting container to ensure that the flow is evenly distributed to the fibrous material.
  • the outlet port of the fluid collecting container is connected to an upstream side of the vacuum source.
  • fluid and gasses are sucked through the fibrous material at the suction side of the vacuum source, e.g. a pump.
  • the inlet port of the fluid collecting container may be connected to a downstream side of the vacuum source, in which case fluids and gasses are forced through the fibrous material at the pressure side of the suction source.
  • the outlet port of the fluid collecting container is preferably connected to ambient air, most preferably through one or more filters, such as through a hydrophobic filter and an odour filter.
  • the fibrous material may comprise non-woven or woven fibres or a mix thereof.
  • the fibrous material should be designed to be sufficiently open to allow gasses to pass through and sufficiently closed to filter particles. Gel blocking should be avoided.
  • Non-woven structures may include airlayed structures, vertical lapped, needle punched structures and carded structures.
  • the non-woven structures may comprise absorbent particles and wicking fibres. Alternatively, fibre material may be absorbent in itself.
  • absorbent particles are Polyacrylate, polyurethane, CMC and other hydrocolloids.
  • absorbent fibres include Polyacrylate or Lanseal* F fibres (2.9 dtex f 38 mm and 5.6 dtex, 51 mm) obtainable from Toyobo co., Ltd, Advanced Polymer Department, 2-8, Dojima Hama 2-Chome, Kita-Ku, Osaka, 530-8230, JAPAN, Polyacrylate fibres may be mixed with another material, such as polyester to increase the mechanical strength of the fibres.
  • the fibres include a core of acryionit ⁇ l with a coating of partially neutralised acrylic acid, obtained e.g. by oxidation of the acryionit ⁇ i.
  • woven structures include sewed, knitted or woven structures.
  • fibres may be oriented to define a desired flow path in the fluid collecting container, for example from the inlet to the outlet via a predefined flow path.
  • the inlet port communicates with a first layer of fibres within the fluid collecting container, which are aligned in one direction only to obtain an essentially straight flow path therethrough. This may cause an initial filtering of particles and initial absorption of fluid.
  • the fluid collecting container may additionally or alternatively comprise at least one further layer of fibres, which are alternatingly oriented in two different directions in a zig-zag configuration. Thereby, the flow path is forced along the zig-zag path thereby maximising the surface area of fibres coming into contact with fluid flow.
  • a layer of straight fibres and one or more layers of zig-zag fibres may be combined into one embodiment.
  • the straight layer and the zig-zag layer may be arranged such that the straight layer of fibres extends from a proximal inlet end of the fluid collecting container to a distal end thereof, whereby fluid may be guided from the first layer of fibres to the at least one further layer of fibres at the distal end of the fluid collecting container remote from the inlet end.
  • the fluid collecting container may comprise inwardly extending baffles for preventing backflow of fluid through the fibrous material or for otherwise assisting in guiding the fluid flow within the fibrous material.
  • the present invention is not limited to the field of wound exudate collection.
  • the fluid collecting container may be provided in the form of an ostomy pouch for collection of faeces or a urine collecting bag.
  • the fibrous material avoids or reduces the risk of leakage.
  • the invention is also applicable for collecting exhaust from respiratory systems.
  • Fig. 1 illustrates a first embodiment of a fluid collecting container 100 comprising a first layer of straight fibres 102 and two layers of zig-zag-oriented fibres 104, Fluid enters the container at an inlet port as indicated by arrows 106, At a distal end of the container, the fluid How turns by 180 degrees and enters the two z ⁇ g ⁇ ⁇ ag layers 104, as indicated by arrows 108. Dashed arrows 110 illustrate gas escaping the container at its outlet, preferably through one or more filters.
  • Fig. 2 illustrates an alternative embodiment, comprising a single mass of zig-zag fibres 112. Liquids, solids and gasses enter the container at the inlet as indicated by arrows 106, and gasses exit the container at the outlet as indicated by dashed arrows U O.

Landscapes

  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • External Artificial Organs (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

System for draining fluid, from a wound, which system comprises a suction source for providing a negative pressure to the wound to draw exudate from the wound, a drainage conduit providing fluid communication from the suction source to the wound and a fluid collecting container (100) for collecting fluid conveyed through the drainage conduit, the fluid collecting container comprising an inlet port (106) and an outlet port (110). The fluid collecting container is essentially filled with an absorbent fibrous material (102,104).

Description

COLLECTING CONTAINER FOR WOUND EXUDATE
T.ggb.o.igg.L.fjgJ.d.
The present invention generally relates to negative pressure systems, i.e. suction systems, for removal of fluids from a wound and thus for enhancing wound healing. Such systems may comprise a wound cover which is attachable to a wound circumference of a living being to form an enclosure, and a pump in fluid communication with the enclosure to provide a pressure difference between a negative pressure in the enclosure and an air pressure of an ambient space. A fluid collecting container is provided for collecting wound exudate, including fluid drawn from the wound.
Background of the invention
It has been found that fluid drainage of wounds promotes tissue growth and thereby facilitates a reduced healing time. The treatment has been exercised for many years, and various therapeutic apparatus for providing suction to a wound have been developed.
Collecting containers for wound exudate may be provided with a filter at their outlet to allow gasses to escape from the containers. It is desirable to avoid that collected fluid or solid matter blocks such filters before the container is full, even when the canister is turned upside down. For this reason, collecting containers are often discharged before they have reached their maximum capacity. This results in increased costs and increased waste.
Blocked filters may result in an alarm being emitted by a control system for controlling operation of a wound drainage system, however it is desirable to minimise the number of alarms.
In case of defect filters, leakage of highly bacterial wound exudate may occur. Leakage may be into a pump, in case an outlet of the container is connected to a pump, or to atmosphere. Such unintended leakage is to be avoided. US 6,648,862 discloses a fluid trapping agent in a chamber of a desiccator cartridge. The fluid trapping agent may include a pillow shape absorbing material with fibrous surfaces. A flow channel with holes is provided to separate gas from fluid. When drained fluid and gas enter the flow channel, gas continues through the flow channel, while liquid drips through the holes, whereafter they are trapped in the trapping agent. Filters may be placed at the end of the flow tube.
Sumrnarv..of the..!nvention
It is therefore an object of preferred embodiments of the present invention to provide a system for draining fluid from a wound and a fluid collecting container for use in such a system, which is reliable and efficient in the sense that the intended amounts of liquid and particles are in fact trapped.
In a first aspect, the invention provides a system for draining fluid from a wound, comprising : - a suction source for providing a negative pressure to the wound to draw exudate from the wound;
- a drainage conduit providing fluid communication from the suction source to the wound;
- a fluid collecting container for collecting fluid conveyed through the drainage conduit, the fluid collecting container comprising an inlet port and an outlet port; wherein the fluid collecting container is essentially filled with an absorbent fibrous material. The fibres are preferably arranged to absorb liquid and solid particles and to allow gasses to pass through the fibres.
In a second aspect, the invention provides a fluid collecting container for a system according to the first aspect of the invention, comprising an inlet port and an outlet port, wherein the fluid collecting container is essentially filled with an absorbent fibrous material.
Preferably, the fluid flow path in or through the fluid collecting container is through the fibrous material in such a way that exudate, including fluid, gas and particles come in direct contact with the fibres. Hence, the need for a separate flow channel with holes is eliminated. This reduces manufacturing costs, eliminates the risk of blockage of the holes in a separate tube extending through the fibrous material. Moreover, preferred embodiments of the present invention ensure that any fluids and solid particles are trapped, thereby reducing the risk of contamination of filters at the outlet port.
A flow distribution channel may be provided at the inlet of the fluid collecting container to ensure that the flow is evenly distributed to the fibrous material.
The outlet port of the fluid collecting container is connected to an upstream side of the vacuum source. In such a configuration, fluid and gasses are sucked through the fibrous material at the suction side of the vacuum source, e.g. a pump. Alternatively, the inlet port of the fluid collecting container may be connected to a downstream side of the vacuum source, in which case fluids and gasses are forced through the fibrous material at the pressure side of the suction source. In the latter embodiment, the outlet port of the fluid collecting container is preferably connected to ambient air, most preferably through one or more filters, such as through a hydrophobic filter and an odour filter.
The fibrous material may comprise non-woven or woven fibres or a mix thereof. The fibrous material should be designed to be sufficiently open to allow gasses to pass through and sufficiently closed to filter particles. Gel blocking should be avoided.
Non-woven structures may include airlayed structures, vertical lapped, needle punched structures and carded structures. The non-woven structures may comprise absorbent particles and wicking fibres. Alternatively, fibre material may be absorbent in itself.
Examples of absorbent particles are Polyacrylate, polyurethane, CMC and other hydrocolloids. Examples of absorbent fibres include Polyacrylate or Lanseal* F fibres (2.9 dtexf 38 mm and 5.6 dtex, 51 mm) obtainable from Toyobo co., Ltd, Advanced Polymer Department, 2-8, Dojima Hama 2-Chome, Kita-Ku, Osaka, 530-8230, JAPAN, Polyacrylate fibres may be mixed with another material, such as polyester to increase the mechanical strength of the fibres.
In one embodiment, the fibres include a core of acryionitπl with a coating of partially neutralised acrylic acid, obtained e.g. by oxidation of the acryionitπi.
Examples of woven structures include sewed, knitted or woven structures.
One advantage of allowing fluid and gas to be in direct contact with the fibres is that the fibres may be oriented to define a desired flow path in the fluid collecting container, for example from the inlet to the outlet via a predefined flow path.
In one embodiment of the present invention, the inlet port communicates with a first layer of fibres within the fluid collecting container, which are aligned in one direction only to obtain an essentially straight flow path therethrough. This may cause an initial filtering of particles and initial absorption of fluid.
The fluid collecting container may additionally or alternatively comprise at least one further layer of fibres, which are alternatingly oriented in two different directions in a zig-zag configuration. Thereby, the flow path is forced along the zig-zag path thereby maximising the surface area of fibres coming into contact with fluid flow.
A layer of straight fibres and one or more layers of zig-zag fibres may be combined into one embodiment. For example, the straight layer and the zig-zag layer may be arranged such that the straight layer of fibres extends from a proximal inlet end of the fluid collecting container to a distal end thereof, whereby fluid may be guided from the first layer of fibres to the at least one further layer of fibres at the distal end of the fluid collecting container remote from the inlet end. The fluid collecting container may comprise inwardly extending baffles for preventing backflow of fluid through the fibrous material or for otherwise assisting in guiding the fluid flow within the fibrous material.
The present invention is not limited to the field of wound exudate collection. For example, the fluid collecting container may be provided in the form of an ostomy pouch for collection of faeces or a urine collecting bag. In such appliances, the fibrous material avoids or reduces the risk of leakage. The invention is also applicable for collecting exhaust from respiratory systems.
Dg^cription of the drawings
Embodiments of the invention will be described with reference to the drawings.
Fig. 1 illustrates a first embodiment of a fluid collecting container 100 comprising a first layer of straight fibres 102 and two layers of zig-zag-oriented fibres 104, Fluid enters the container at an inlet port as indicated by arrows 106, At a distal end of the container, the fluid How turns by 180 degrees and enters the two zϊg~ ∑ag layers 104, as indicated by arrows 108. Dashed arrows 110 illustrate gas escaping the container at its outlet, preferably through one or more filters.
Fig. 2 illustrates an alternative embodiment, comprising a single mass of zig-zag fibres 112. Liquids, solids and gasses enter the container at the inlet as indicated by arrows 106, and gasses exit the container at the outlet as indicated by dashed arrows U O.

Claims

1. A system for draining fluid from a wound, comprising :
- a suction source for providing a negative pressure to the wound to draw exudate from the wound; - a drainage conduit providing fluid communication from the suction source to the wound;
- a fluid collecting container for collecting fluid conveyed through the drainage conduit, the fluid collecting container comprising an inlet port and an outlet port; wherein the fluid collecting container is essentially filled with an absorbent fibrous material.
2. A system according to claim 1, further comprising a flow distribution channel at the inlet of the fluid collecting container.
3. A system according to claim 1 or 2, wherein the outlet port of the fluid collecting container is connected to an upstream side of the vacuum source.
4. A system according to claim 1 or 2, wherein the inlet port of the fluid collecting container is connected to a downstream side of the vacuum source, and wherein the outlet port of the fluid collecting container is connected to ambient air.
5. A system according to any of the preceding claims, wherein the fibres are arranged to absorb liquid and solid particles and to allow gasses to pass through the fibres.
6. A system according to any of the preceding claims, wherein the fibrous material comprises at least one of:
- non-woven fibres; - woven fibres.
7. A system according to any of the preceding claims, wherein the fibres are oriented to define a desired flow path in the fluid collecting container.
8. A system according to any of the preceding claims, wherein the inlet port communicates with a first layer of fibres within the fluid collecting container, which are aligned in one direction only to obtain an essentially straight flow path therethrough.
9. A system according to any of the preceding claims, wherein the fluid collecting container comprises at least one further layer of fibres, which are alternatingly oriented in two different directions in a zig-zag configuration.
10. A system according to claims 8 and 9, wherein the first and further layers of fibres are arranged such that the first layer of fibres extends from a proximal inlet end of the fluid collecting container to a distal end thereof, whereby fluid may be guided from the first layer of fibres to the at least one further layer of fibres at the distal end of the fluid collecting container remote from the inlet end.
11. A system according to any of the preceding claims, wherein the fluid collecting container comprises inwardly extending baffles for preventing backflow of fluid through the fibrous material.
12. A fluid collecting container for a system according to any of the preceding claims, comprising an inlet port and an outlet port, wherein the fluid collecting container is essentially filled with an absorbent fibrous material.
13. A fluid collecting container according to claim 12, further comprising a flow distribution channel at the inlet of the fluid collecting container.
14. A fluid collecting container according to claim 12 or 13, wherein the fibres are arranged to absorb liquid and solid particles and to allow gasses to pass through the fibres.
15. A fluid collecting container according to any of claims 12-14, wherein the fibrous material comprises at least one of:
- non-woven fibres;
- woven fibres.
16. A fluid collecting container according to any of claims 12-15, wherein the fibres are oriented to define a desired flow path in the fluid collecting container.
17. A fluid collecting container according to any of claims 12-16, wherein the inlet port communicates with a first layer of fibres within the fluid collecting container, which are aligned in one direction only to obtain an essentially straight flow path therethrough.
18. A fluid collecting container according to any of claims 12-17, wherein the fluid collecting container comprises at least one further layer of fibres, which are alternatingly oriented in two different directions in a zig-zag configuration.
19. A fluid collecting container according to claims 17 and 18, wherein the first and further layers of fibres are arranged such that the first layer of fibres extends from a proximal inlet end of the fluid collecting container to a distal end thereof, whereby fluid may be guided from the first layer of fibres to the at least one further layer of fibres at the distal end of the fluid collecting container remote from the inlet end.
20. A fluid collecting container according to any of claims 12-19, wherein the fluid collecting container comprises inwardly extending baffles for preventing backflow of fluid through the fibrous material.
PCT/EP2008/066467 2007-11-30 2008-11-28 Collecting container for wound exudate WO2009068667A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US476707P 2007-11-30 2007-11-30
US61/004,767 2007-11-30

Publications (2)

Publication Number Publication Date
WO2009068667A2 true WO2009068667A2 (en) 2009-06-04
WO2009068667A3 WO2009068667A3 (en) 2009-08-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013059277A1 (en) * 2011-10-17 2013-04-25 Kci Licensing, Inc. System and apparatus for treating a tissue site having an in-line canister
EP2349155A4 (en) * 2008-11-14 2013-05-01 Kci Licensing Inc FLUID POUCH, SYSTEM, AND METHOD FOR STORING A FLUID TAKEN FROM A TISSUE SITE
FR3015226A1 (en) * 2013-12-20 2015-06-26 Urgo Lab COMPOSITE MATERIAL FOR FILLING WITH CIVIC WOUNDS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE500395C2 (en) * 1992-10-16 1994-06-20 Humanteknik Ab Moisture absorbing device
US7004915B2 (en) * 2001-08-24 2006-02-28 Kci Licensing, Inc. Negative pressure assisted tissue treatment system
US6648862B2 (en) * 2001-11-20 2003-11-18 Spheric Products, Ltd. Personally portable vacuum desiccator

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2349155A4 (en) * 2008-11-14 2013-05-01 Kci Licensing Inc FLUID POUCH, SYSTEM, AND METHOD FOR STORING A FLUID TAKEN FROM A TISSUE SITE
US8728044B2 (en) 2008-11-14 2014-05-20 Kci Licensing, Inc. Fluid pouch, system, and method for storing fluid from a tissue site
EP2868300A1 (en) * 2008-11-14 2015-05-06 KCI Licensing, Inc. Fluid pouch, system, and method for storing fluid from a tissue site
US10780203B2 (en) 2008-11-14 2020-09-22 Kci Licensing, Inc. Fluid pouch, system, and method for storing fluid from a tissue site
WO2013059277A1 (en) * 2011-10-17 2013-04-25 Kci Licensing, Inc. System and apparatus for treating a tissue site having an in-line canister
AU2012326235B2 (en) * 2011-10-17 2017-06-29 Kci Licensing, Inc. System and apparatus for treating a tissue site having an in-line canister
US10004880B2 (en) 2011-10-17 2018-06-26 Kci Licensing, Inc. System and apparatus for treating a tissue site having an in-line canister
US10960187B2 (en) 2011-10-17 2021-03-30 Kci Licensing, Inc. System and apparatus for treating a tissue site having an in-line canister
FR3015226A1 (en) * 2013-12-20 2015-06-26 Urgo Lab COMPOSITE MATERIAL FOR FILLING WITH CIVIC WOUNDS

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