Source: https://patents.google.com/patent/ES2629634T3/en
Timestamp: 2019-12-07 11:57:40
Document Index: 792266608

Matched Legal Cases: ['art 154', 'art 156', 'art 154', 'art 154', 'art 220', 'art 156', 'art 154']

ES2629634T3 - Wound dressing - Google Patents
ES2629634T3
ES2629634T3 ES11722122.6T ES11722122T ES2629634T3 ES 2629634 T3 ES2629634 T3 ES 2629634T3 ES 11722122 T ES11722122 T ES 11722122T ES 2629634 T3 ES2629634 T3 ES 2629634T3
ES11722122.6T
2010-04-27 Priority to GB201006985 priority
2017-08-11 Publication of ES2629634T3 publication Critical patent/ES2629634T3/en
Apparatus for treating a wound by applying topical negative pressure to the wound site, comprising: an absorbent layer (110) intended to absorb wound exudate; a gas-impermeable cover layer (140) located on the absorbent layer (110), the cover layer (140) comprising at least two holes (145, 845), allowing the holes through the cover layer ( 140) negative pressure is communicated to at least two separate regions, and each orifice (145, 845) being located in a respective of at least two separate regions; a fluid communication passage connecting said at least two holes (145, 845); and characterized in that there is a gas permeable and liquid impermeable filter membrane (130) in each of said at least two holes (145, 845).
The present invention relates to a method and apparatus for treating a wound and a method for manufacturing a wound dressing. In particular, but not exclusively, the present invention relates to a dressing usable for applying topical negative pressure therapy (PNT), in which the dressing itself acts as a waste canister that receives and stores exudate removed from the site of a wound.
A lot of prior art is available related to the provision of apparatus and its methods of use for the application of topical negative pressure therapy (PNT) to wounds together with other therapeutic processes aimed at improving the effects of TNP therapy. Examples of such prior art are those which are briefly mentioned below.
WO2009 / 12x100 describes a micropump system that applies a subatmospheric pressure to the wound to effectively extract fluid or exudate from the wound bed.
WO / 2009/066105 describes a sealing layer comprising at least one hole.
PNT therapy facilitates the closure and healing of wounds by reducing tissue edema, favoring blood flow, stimulating the formation of granular tissue, eliminating excess exudate and being able to reduce bacterial load and thus wound infection. PNT therapy, on the other hand, allows to reduce the external disturbance of the wound and accelerate its healing.
Certain devices and methods of the prior art in general are only suitable to be applied to hospitalized patients because of their complexity, for requiring specialized knowledge about their operation and maintenance, and for being also relatively heavy and bulky, not suitable, for example, for be easily moved by a patient outside the hospital environment.
Some patients with relatively minor injuries that do not require continuous hospitalization may benefit from a prolonged application of PNT therapy at home or work if they had a PNT therapy device that is easy to transport and maintain. It is known that for this purpose a portable PNT therapy unit that a patient carries with him or her in a belt or harness can be provided. That way a negative pressure could be applied to the site of a wound.
A PNT therapy unit, portable or not, generates negative pressure at the site of a wound. Fluid removed from the wound site, which includes air and exudate material, must somehow be collected away from the wound site. Typically, prior art known therapy units collect and store wound exudate material through a waste canister connected to the therapy unit pump. The use of a boat makes it difficult to use the therapy unit apparatus and makes it more expensive to manufacture. On the other hand, replace a boat
or the bag of a canister for collecting wound exudate can be a slow and relatively unsanitary process.
It is an object of the present invention to mitigate, at least partially, the aforementioned problems.
It is an object of some embodiments of the present invention to offer a method by which negative pressure is communicated to the site of a wound to facilitate wound closure and healing, and wound exudate extracted from the wound is collected and stored in a dressing. wound site during therapy.
It is an object of some embodiments of the present invention to offer a dressing with greater capacity to absorb wound exudate to reduce the frequency with which it is to be changed.
It is another object of some embodiments of the invention to control the movement of wound exudate in a dressing to avoid blockages that shorten the shelf life of the dressing.
The invention is claimed by the claims. According to one example, an apparatus is provided for treating a wound by applying topical negative pressure to the site of the wound, which comprises:
an absorbent layer intended to absorb wound exudate;
a gas impermeable cover layer located on the absorbent layer, the cover layer comprising at least one hole provided so that through the cover layer negative pressure is communicated to at least two regions, separated from each other.
According to one example, a method for applying topical negative pressure (PNT) to the site of a wound is provided, comprising the following steps:
fix the cover layer of a dressing around the wound site;
MHM block liquids and at the same time allow air to flow through them. They are also highly effective air filters that eliminate aerosols and potentially infectious particles. A single piece of MHM is a well known option to replace mechanical valves or ventilation openings. MHM can reduce product assembly costs and improve the cost / benefit of the patient.
The filter element 130 may also include an odor absorbing material, for example, activated carbon, carbon fiber cloth, Vitec Carbotec-RT Q2003073 foam or the like. For example, an odor absorbing material may constitute a layer of the filter element 130 or may be provided between microporous hydrophobic membranes of the filter element.
The filter element 130 thus allows gas to be evacuated through the hole 145. But liquid, particles and pathogens are retained in the dressing.
In the case of particular embodiments with a single door 150 and a single through hole it may be desirable that both elements are provided in an off-center position, as shown in Figures 1 and 2. Such position allows the dressing 100 to be applied to a patient in a manner that the door 150 is raised in relation to the rest of the dressing 100. In this way the probability of the door 150 and the filter 130 coming into contact with wound fluids that could prematurely obstructing the filter 130 and compromising efficiency can be reduced. of the transmission of negative pressure to the site of the wound.
Figure 11 shows a plan view of a suction door 150 in accordance with some embodiments of the invention. The suction door comprises a sealing surface 152 intended to join the door with a dressing, a connector part 154 for connecting the suction door 150 with a source of negative pressure and a hemispherical body part 156 between the sealing surface 152 and the connector part 154. The sealing surface 152 comprises a substantially flat surface flange that guarantees a good seal when the door 150 is applied with the cover layer 140. The connector part 154 is intended to be coupled with the source external negative pressure by means of a tube part 220.
According to some embodiments, the filter element 130 forms part of the bacterial barrier of the wound site and therefore it is important that a good seal is created around it and maintained. But it has been determined that the seal created by adhering the filter element 130 to the cover layer is not reliable. This is especially problematic when a wet vapor permeable cover layer is used, since the water vapor exhaled from the cover layer 140 by perspiration can affect the adhesive and break the bond between the filter element and the cover layer. Thus, according to some embodiments of the invention, an alternative arrangement of attachment of the filter element 130 is employed that prevents the penetration of liquid into the connector portion 154.
Figure 12 shows a cross section of the suction door 150 of Figure 11 according to some embodiments of the invention, the line A-A of Figure 11 indicating the site of the cross section. The suction door 150 of Figure 12 comprises the filter element 130 within its body part 156. The sealing between the suction door 150 and the filter element is guaranteed by molding the filter element within the body part. of suction door 150.
Figure 13 shows a cross section of the suction door 150 of Figure 11 according to some embodiments of the invention. The filter element 130 is connected to the sealing surface 152 of the suction door 150. The filter element can be connected to the sealing surface by means of an adhesive or weld.
The arrangement of the filter element 130 as part of the suction door 150 shown in Figures 12 and 13 avoids the problems encountered when the filter element is adhered to the cover layer 140 and allows a reliable connection. In addition, a subset in which the filter element 130 forms part of the suction door 150 allows the dressing 100 to be manufactured more simply and efficiently.
Although the suction door 150 has been described in the context of the dressing 100 of Figure 1, it will be apparent that the embodiments of Figures 12 and 13 are applicable to any dressing that retains exudate therein removed from the wound by pressure application negative. According to some embodiments of the invention, the suction door 150 is made of transparent material so that a user can see if the wound exudate passes through it.
In operation, the dressing 100 is fixed at the site of a wound so as to form a wound cavity. By means of a pump unit (shown in Figure 17 and described in more detail in the following) negative pressure is applied to a connecting part 154 of the door 150 communicated with the transmission layer 105 thanks to the hole 145. From the site of a wound, beneath the layer 102 of contact with the wound, fluid is passed through the dressing in the direction of the hole. The fluid moves in the direction of the hole through the transmission layer
105. At the same time that fluid is passed through the transmission layer 105, wound exudate is penetrated into the absorbent layer 110 by absorption.
Figure 2 shows a dressing 100 according to an embodiment of the present invention in which the upper surface of the cover layer 140 extends outwardly away from the center of the dressing in the direction of a
ES11722122.6T 2010-04-27 2011-04-21 Wound dressing Active ES2629634T3 (en)
GB201006985 2010-04-27
ES2629634T3 true ES2629634T3 (en) 2017-08-11
ES11722122.6T Active ES2629634T3 (en) 2010-04-27 2011-04-21 Wound dressing
GB2298371A (en) * 1993-12-01 1996-09-04 Smith & Nephew Wound dressing
2011-04-21 BR BR112012027537A patent/BR112012027537A2/en active Search and Examination
CN103037822B (en) 2016-08-03