Shear resistant wound dressing for use in vacuum wound therapy.
Abstract
A cover layer for a vacuum wound therapy dressing includes a backing layer formed from a flexible polymeric membrane and an adhesive layer for affixing the backing layer over a wound bed to provide a substantially fluid-tight seal around a perimeter of the wound bed. The cover layer is reinforced with a reinforcement layer extending to a peripheral region of the backing layer to distribute forces associated with evacuating a reservoir, as defined by or within the cover, to stimulate healing of the wound bed.

Term
2.5 yearsleft in the term
Expires 13 March 2029.
- Priority
- Filed
- Granted
- Today
- Expires
6 claims: 4 independent, 2 dependent
- 1REIVINDICACIONES Intfitutc Mexicano déla Propiedad Industriar reclama como propiedad lo contenido en las siguientes reivindicaciones:1. Un sistema de terapia de heridas al vacío, caracterizado porque comprende: un apósito para herida que comprende: una capa de soporte que comprende una membrana polimérica flexible, la capa de soporte incluye un lado la herida y un lado exterior opuesto al interior orientado a lado orientado a la herida y una abertura que se extiende a través de la capa de soporte;un adhesivo dispuesto sobre el lado interior orientado a la herida de la capa de soporte, el adhesivo está adaptado para fijar la capa de soporte sobre una herida y proporcionar un sello sustancialmente hermético a fluido alrededor de un perímetro de la herida;una capa de refuerzo en contacto con la capa de soporte y dispuesta sobre el lado interior orientado a la herida de la capa de soporte;un relleno absorbente que incluye un lado interior orientado a la herida, en donde el relleno absorbente está configurado para estar en comunicación fluida con la capa de refuerzo y configurado para recolectar exudado removido de la herida;y Instituto una capa de contacto con la herida perforad^ 8½ estar en contacto directo con la herida, en donde el rellertó^ 8 ^^ 01 ^ absorbente está colocado sobre la capa de contacto con la herida;un puerto de vacío para facilitar conexión de un sistema de vacío al apósito para herida, en donde el puerto de vacío define un pasaje de fluido para acoplamiento fluido entre un tubo de vacío y un depósito de vacío definidos dentro del apósito para herida, en donde el puerto de vacío comprende: una brida que tiene un lado inferior y un lado superior, en donde el lado inferior de la brida tiene una abertura colocada sobre la abertura en la capa de soporte y el lado inferior de la brida está asegurado al lado exterior de la capa de soporte;y un segmento conector que se extiende sobre la brida para conexión al tubo de vacío;y una pantalla filtro colocada bajo el puerto de vacío configurada para prevenir migración de partículas dentro del puerto de vacío.
- 2El sistema de conformidad con la reivindicación 1, caracterizado porque la capa de refuerzo comprende una rigidez adecuada para resistir deformación de la capa de apósito durante aplicación de la terapia de herida sistema de conformidad de vacío a la herida.
- 3El dota Propiedad con i4rídusTrta? reivindicación 1, caracterizado porque la capa de refuerzo comprende una red de fibras interconectadas que comprende una malla formada de tereftalato de polietileno (PET). El sistema de conformidad con la reivindicación 1, caracterizado porque la capa de refuerzo es sustancialmente resistente a líquidos. 5. El sistema de conformidad con la reivindicación 1, caracterizado porque la capa de refuerzo comprende una malla formada de fibras. 6. El sistema de conformidad con la reivindicación 5, caracterizado porque las fibras están interconectadas. 7. El sistema de conformidad con la reivindicación 1, caracterizado porque el adhesivo es fijado a una región periférica de la capa de soporte e incluye una abertura de manera que el adhesivo no se extiende a una región central del apósito. 8. El sistema de conformidad con la reivindicación 7, caracterizado porque el adhesivo se superpone a una porción de la capa de refuerzo de manera que la capa de refuerzo se fija a la capa de soporte. 9. El sistema de conformidad con la reivindicación 1, caracterizado porque la capa de soporte comprende una película de poliuretano que tiene un desde aproximadamente 20 pm (0.8 milésimas de pulgada) dustrtaf aproximadamente 25 pm (1.0 milésimas de pulgada). 10. El sistema de conformidad con la reivindicación 1, caracterizado porque la capa de soporte comprende una membrana permeable al vapor de humedad. 11. El sistema de conformidad con la reivindicación 1, caracterizado porque el relleno absorbente comprende material configurado para atrapar exudado. 10 12. El sistema de conformidad con la reivindicación 1, caracterizado porque además comprende un sistema de vacío que incluye una fuente de vacío para proporcionar presión reducida al depósito de vacío dentro del apósito. 13. El sistema de conformidad con la reivindicación 1, caracterizado porque la capa de contacto con la herida está configurada para promover un flujo sustancialmente unidireccional de fluido de manera que se evita que el exudado removido de la herida fluya de regreso 20 hacia la herida. 14. El sistema de conformidad con la reivindicación 1, caracterizado porque la pantalla filtro se extiende a través de la abertura en el lado inferior del puerto de vacío de manera que cualquier fluido que pasa a 25 través del pasaje de fluido del puerto de vacío debe pasar a conformidad través de la pantalla filtro. 15. El sistema de con industrial reivindicación 1, caracterizado porque la capa de soporte, la capa de refuerzo y la capa de contacto con la herida tienen 5 una forma cuadrada. 16. El sistema de conformidad con la reivindicación 1, caracterizado porque la abertura en la capa de soporte se proporciona en una región central de la capa de soporte. industriar Se proporciona una capa de cubierta para un apósito para el tratamiento de heridas al vacio que incluye una capa 5 de soporte formada de una membrana polimérica flexible y una capa adhesiva para fijar la capa de soporte sobre un lecho de herida para proporcionar un sello sustancialmente hermético a fluidos alrededor del perímetro del lecho de herida. La capa de cubierta se refuerza con una capa de refuerzo que se 10 extiende en la región periférica de la capa de soporte para distribuir fuerzas asociadas con evacuación de un depósito, como se define por o dentro de la cubierta, para estimular el sanado del lecho de herida 1/7 deta ¡edad Industria' FIG. 1 2/7 Mexicano defaProP ,edad industria’ 56 \ . . 46 -----R v ^ FIG. 3 3/7 FIG. 4A FIG. 4B
- 44/7 ÜJ FIG. 5 FIG. 7 FIG. 6
- 55/7 FIG. 8B FIG. 8C
- 66/7 déla Propiedad Industrk.i FIG. 10 FIG. 11
Independent claims6
186 paragraphs in 12 sections, as filed
(54) Title: TEAR RESISTANT WOUND DRESSING, FOR USE IN VACUUM WOUND TREATMENT.
(54) Title: SHEAR RESISTANT WOUND DRESSING FOR USE IN VACUUM WOUND THERAPY.
(57) Summary
A cover layer for a vacuum wound dressing is provided which includes a backing layer formed of a flexible polymeric membrane and an adhesive layer for affixing the backing layer to a wound bed to provide a substantially watertight seal to fluids around the perimeter of the wound bed. The cover layer is reinforced with a reinforcing layer that extends in the peripheral region of the support layer to distribute forces associated with evacuation of a reservoir, as defined by or within the cover, to stimulate the healing of the bed of wound.
(57) Abstract
A cover layer for a vacuum wound therapy dressing includes a backing layer formed from a flexible polymeric membrane and an adhesive layer for affixing the backing layer over a wound bed to provide a substantially fluid-tight seal around a perimeter of the wound bed. The cover layer is reinforced with a reinforcement layer extending to a peripheral region of the backing layer to distribute forces associated with evacuating a reservoir, as defined by or within the cover, to stimulate healing of the wound bed.
T '' ___SE___
Έι κι I AiUA OI f ΙΠΧΟΜΙΑ,
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Mexican Institute of Industrial Property
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PATENT TITLE NO. 336239
<td>Headlines):</td><td>SMITH & NEPHEW, INC.</td>
<td>Home:</td><td>1450 Brooks Road, Memphis, Tennessee, 38116, USA</td>
Denomination: TEAR RESISTANT WOUND DRESSING. FOR USE IN VACUUM WOUND TREATMENT
<td>Classification:</td><td>lnt.CI.8: A61F13 / 02</td>
<td>Inventor (s):</td><td>RONALD F. VITARIS; BETHANY A. VITARIS</td>
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Ius i
Validity: Twenty wlos l ^ eha.de Vencifi
The reference patent is Porga with Indamente
D «tada from the date of presei di lienta * 13 d
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idustrial.
unimpeachable items, keep> lenses
Internal filing date of March 2009
PRIORITY
Date:
March 2029 in accordance with article 23 of lagey of the P icion of echos.
fraction V, 6 * useful fraction, and patent tienaunp will be subject to .flK<sup>1</sup> you have a title based on Industrial piety (DiarioÍDficial den Federación (DOF) 2
...... ’ 11/2006,0105/2009,06/01/2010,18/06/20
M4 ^ 12 ^ acgonfc i and I ·· tn Regulations of the Mexican Institute of Industrial Property (DOF
Q in subscribes to presents
P,
01/2004, 06/16/2005, 2I
0 'ΙττΓζυυζ,' ΊτίΓυΓΓζυυ ^ 'Γζστν // zuu<sup>4</sup>! and nwwzui vt j, aiuvuiuo i, v<sub>t</sub> * r, "j ιιαννινιΓ and ihviow" s /<sub>t</sub> iw I! CNA ^ UIIC <3 iy in y vu uci i— «Jrnroto of the Mexican Institute of Industrial Property (DOF 12/27/1999, reformed 10/10/2002, 07/29/2004, 04/08 / 2004 and 09/13/2007); one<sup>or</sup>, 3<sup>or </sup>and 5th paragraph a) of the Agreement that delegates powers to the Deputy Directors General, Coordinator, Divisional Directors, Head of the Regional Offices, Divisional Deputy Directors, Departmental Coordinators and other subordinates of the Mexican Institute of Industrial Property. (DOF 12/15/1999, amended on 02/04/2000, 07/29/2004, 08/04/2004 and 09/13/2007).
<sup>1</sup> T, v. '
III and 7 ° bis 2 of II - 10/1996, 12/26/1997, and 04/09/2012); articles 1, 3
Law of / 05/1999, ration V, OF 14/12/1999, r (signed the Organic
Issue Date: January 13, 2016
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NAHANNY CANAL REYES
Arenal No. 550, Floor 1, Col. Pueblo Santa María Tepepan.
Xochimilco Delegation,
CP 16020. Mexico. DF
Tea!. (55) 5x3 34 07 00 www.iinpi.Qob.iTix
THE DIVISIONAL DIRECTOR OF PATENTS
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33 (> «1 to 2-0 of a
10132 use
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Mexicano do Industrial Property way wound wound to μ al
- 1 TEAR RESISTANT WOUND DRESSING, FOR VACUUM WOUND TREATMENT
FIELD OF THE INVENTION
The present disclosure relates generally to a wound dressing for open treatment with a vacuum treatment procedure. In particular, the disclosure relates to a wound dressing that utilizes a web-like or mesh-like reinforcing structure to protect the wound during the procedure.
BACKGROUND OF THE INVENTION
The body's natural wound healing process is a complex series of events that begins at the moment of damage. Initially the body reacts by supplying protein and other factors to the wound through the bloodstream to minimize damage. Blood clots to prevent blood loss while cells pack bacteria and debris to remove it from the wound site. Afterward, the body begins to repair itself in a healing stage that is often referred to as the proliferation phase. This phase is characterized by granulation deposition tissue in the wound bed. Granulation tissue provides a base structure upon which cells can move inward from the
Ref.: 214054 periphery to close the wound. Finally, it ends when collagen provides resistance to
<img file="MX336239B_D0008.tif" />
New Mexican process IncJuStfftlF over time, often forming a scar.
A technique to promote the natural healing process, particularly although not exclusively during the proliferation phase, is known as vacuum wound treatment (VWT). Applying reduced, eg subatmospheric, pressure to a reservoir located above the wound has been found to help close the wound. Reduced pressure can be effective in promoting blood flow to the area, stimulating granulation tissue formation, and healthy tissue displacement over the wound by natural processes. Additionally, reduced pressure can help remove fluids oozing from the wound, which can inhibit bacterial growth. This technique has been shown to be effective for chronic or non-healing wounds, but has also been used for other purposes such as post-surgical wound care.
The general procedure for VWT provides the introduction of a filler material into the wound to absorb exudates and promote fluid transport away from the wound bed. The wound filler may comprise materials such as non-foams
<img file="MX336239B_D0009.tif" />
Crosslinked, non-woven reinforcements absorbent filler material covered by an adhesive periphery cover layer that forms a substantially fluid-tight seal with the healthy skin surrounding the wound. In this way, the cover layer defines a vacuum reservoir on the wound where reduced pressure can be maintained over time by individual or cyclical vacuum generation procedures.
One aspect of concern in a VWT treatment is the management of the forces generated in the dressing when reduced pressure is applied. These forces can undesirably deform a flexible covering layer, pull the margins around the wound into the wound, and strain the surrounding skin. These same forces can significantly compress the absorbent pad so that it forms a rigid mass. In this state, the filler has an increased tendency to adhere to the wound bed, limits the fluid passages available for the transport of exudate, and prevents the penetration of reduced pressure through it. Accordingly, there is a need for a suitable dressing for use in a VWT procedure.
SUMMARY OF THE INVENTION
The present invention describes a dressing for use
<img file="MX336239B_D0010.tif" />
in a vacuum wound treatment procedure P<sup>ar</sup>The flex of the Property promote the healing of a wound. The dressing includes a<sup>AC</sup>P ^ ñdUStrlOt of cover that has an integrated support structure to manage forces associated with a VWT procedure. The cover layer includes a backing layer formed of a flexible polymeric membrane, an adhesive layer for affixing the backing layer to a wound and providing a seal around the wound bed, and a crosslinked or net-like reinforcing layer to the support layer and extending in the peripheral region of the cover layer. The net-like backing layer stiffens the cover layer and contributes to the cover layer's ability to resist deformation in the wound area commonly associated with a VWT procedure. Therefore, the wound filling can be compressed to a lesser degree so that it continues to provide exudate transport and vacuum penetration. The use of the net-like reinforcing layer also decreases the degree to which the wound margin collapses and may contribute to the presentation of forces generated by the application of reduced pressure as compression forces rather than tear forces. It is well known that the compressive forces applied to a wound are beneficial for wound treatment.
The reinforcing layer can be formed from
<img file="MX336239B_D0011.tif" />
structures such as 1 polyethylene fiber mesh, perforated films and lattice The adhesive layer can be attached to a region eg:
backing layer and may include an opening such that the adhesive layer does not extend to a central region of the cover layer. The adhesive layer can be superimposed on a portion of the backing layer so that the backing layer is firmly attached to the backing layer. Alternatively, the backing layer may contain an appropriate adhesive coating to bond more firmly to the backing layer. The backing layer can be formed of a polyurethane film that has a thickness from about 20 gm (0.8 thousandths of an inch) to about 25 gm (1.0 thousandths of an inch) and can include a perforation in it to facilitate the connection of a vacuum port to cover layer. The vacuum port can incorporate a filter screen that defines a plurality of openings. The support layer can be formed from a vapor and moisture permeable membrane.
In accordance with another aspect of the description, a wound dressing system includes a contact layer and an absorbent pad placed in a wound bed and covered by a cover layer. A vacuum reservoir is defined between the cover layer and the wound bed. The cover layer includes a polymeric membrane to fix the support layer
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a support layer that forms from the flexible anus, an adhesive layer
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about a wound and provide
Industry a seal around the wound bed, and a reinforcing layer fixed to the support layer and extending in the peripheral region of it is in communication
The layer of the support layer. A fluid vacuum system with the vacuum reservoir.
Contact can be formed from a conical perforated film to promote the unidirectional flow of extrudates from the wound. The absorbent filler material may include a single strand or a polyolefin filament. Additionally, the vacuum system can include a vacuum source, a collection container, and a one-way valve.
BRIEF DESCRIPTION OF THE FIGURES
The accompanying figures, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the detailed description of the embodiments provided in the following, serve to explain the principles of the disclosure.
Figure 1 is a perspective view of a vacuum wound treatment system in accordance with the present invention;
Figure 2 is an orthographic view of a wound facing the side of Figure 1;
figure 3 is a view in the layer
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Mexican Property exploded cross-sectional section taken along line 3-3 of Figure 2;
Figure 4A is a cross sectional view of a vacuum wound treatment system of Figure 1 installed on a wound in a patient prior to the application of reduced pressure;
Figure 4B is a cross sectional view of a vacuum wound treatment system of Figure 1 installed on a wound in a patient after application of reduced pressure;
Figure 5 is a top plan view of a vacuum port of Figure 1;
Figure 6 is a perspective view of the vacuum port of Figure 5;
Figure 7 is a perspective view of an alternative embodiment of a vacuum port;
Figure 8A is an exploded perspective view of an alternative embodiment of a vacuum port assembly including a portal member and a separate filter screen;
Figure 8B is a perspective view of the filter screen of Figure 8A in an alternative orientation;
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in perspective of a MexJcano Property independent filter; Figure 8C is an alternative embodiment view of a screen; the figure is a bottom plan view of the portal member of Figure 8A;
The figure is a partial cross-sectional view of the wound mounting dressing;
Vacuum port assembly in Figure 11 is an exploded perspective view of an alternative embodiment of a vacuum port assembly that includes a treatment element.
DETAILED DESCRIPTION OF INVENTION
The wound dressing of the present disclosure promotes wound healing by providing a deposit on the wound where reduced pressure can be maintained. The reservoir subjects the wound to subatmospheric pressure to effectively remove wound fluid, including liquid exudates, from the wound without the continued use of a vacuum pump. Therefore, vacuum pressure can be applied once, or at varying intervals depending on the nature and severity of the wound. To facilitate fluid transport from the wound, a filler material may be included within the reservoir to promote capillarity of wound fluids under reduced pressure. Using wound dressing in this way has been found to promote healing by reducing
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dressing
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probability of infection, stimulate deposition, granulation and other beneficial processes. The wounds of the present disclosure include a covered IndUStflaf layer having a reinforcing structure to enhance the effect of a vacuum wound therapy treatment.
The accompanying figures illustrate exemplary embodiments of the present disclosure and reference to describe the embodiments presented herein. In the following, this document will describe in detail explaining the figures where similar reference numbers represent similar parts in the various views.
Referring initially to Figure 1, a vacuum wound treatment system in accordance with the present disclosure is generally shown at 10 for use in a wound w surrounded by healthy skin s. Vacuum wound treatment system 10 includes a vacuum system 12 in fluid communication with a vacuum reservoir 14 (see Figure 4A) defined by, or within, a wound dressing 16. Vacuum system 12 includes a vacuum source 18 coupled to dressing 16 through a one-way valve 20 and a vacuum tube 24. A collection container 28 can be provided for wound drainage and waste. Vacuum system 12 is adapted to provide reduced pressure to the tank
<img file="MX336239B_D0018.tif" />
to stimulate the healing of the more detailed Mexican heri ttüt from a 12 endowed system
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suitable vacuum age
w. A description
Appropriate Industrtof is found in US patent application publication 2007/0066946, under common ownership, the entire content of which is incorporated herein by reference.
A vacuum port 30, shown in greater detail in Figure 5 and Figure 6, may also be included to facilitate connection of the vacuum system 12 to the dressing
16. Vacuum port 30 can be configured as a rigid or semi-rigid low profile component adapted to receive a vacuum tube 24 in a releasable and
<td>hermetic to</td><td>fluids. The</td><td colspan="2">port 30</td><td>of</td><td>empty</td><td>can be</td>
<td>configured</td><td>to include</td><td>a</td><td>flange</td><td> 32</td><td>large</td><td>and flexible</td>
<td>about</td><td>its perimeter.</td><td>The</td><td>flange</td><td> 32</td><td>It allows</td><td>let me join</td>
an adhesive either on the underside of flange 32 for securing to an external surface of cover layer 44 or to an upper side of flange 32 to provide mounting on the underside of backing layer 46. Either configuration provides a mechanism for connecting to dressing 16. A hollow interior of vacuum port 30 provides fluid communication between vacuum tube 24 and reservoir 14 defined by or within dressing 16. A connector segment 33 extends above flange 32 to facilitate connection to vacuum tube 24. It is considered that due to the narrow vacuum port 3 0 either
<img file="MX336239B_D0020.tif" />
dtetfasMat filler 38 for wound, the operation of the empty port 30 can be improved by incorporating a filter screen 58, as shown in figure 6 and figure 7. The filter screen 58 can prevent large particle displacement than otherwise they can be withdrawn to the vacuum port 30 and consequently generate a restriction or blockage of the vacuum tube 24. Filter screen 58 may be integral to the configuration of vacuum port 30 as part of port flange 32. Filter screen 58 can include several openings each smaller in its cross-sectional area of vacuum tube 24 or the opening of vacuum port 30 can be adapted to receive vacuum tube 24, and collectively larger than the Cross-sectional area of the vacuum tube 24 or the opening in the vacuum port 30 can be adapted to receive the vacuum tube 24. For example, the vacuum port 30 filter screen 58 may include four relatively large openings while the vacuum port 30A filter screen 58A shown in Figure 7 may include six relatively small openings. The openings in the filter screens 58, 58A are sized to minimize the passage of tissue particles of a predetermined dimension through the respective vacuum port, 30, 30A.
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Another alternative type of vacuum port <sup>I know</sup>M © XÍcanG de fa Property shows generally with the number 3 0 in figure 8A, (n (justrÍG<sup>:</sup> Figure 9, Figure 10 and Figure 11. Vacuum port 30B can be configured to accept a 59 or 60 filter screen as a separate or separate manufactured component, as shown in Figure 8A, Figure 10, and Figure eleven. An opening or cavity 31 shown in the plan view of Figure 9 and shown in broken lines in Figure 8A on a underside of the vacuum port 3 0B can be adapted to allow the filter screen 59 to be permanently attached thereto so that the filter screen 59 is substantially in the same plane as the underside of the vacuum port 30B. Alternatively, the filter screen 60 can be attached to the opening on the underside of the vacuum port 30B. Filter screen 60 may include a generally flat base 62 through which openings 65 extend and a pair of lips 64 projecting from base 62 along opposite edges of filter screen 60. Lips 64 may be sized to be in the same plane as a patient oriented below the flange surface when received within cavity 31. Alternatively, lips 64 may extend beyond the lower flange surface to extend bypassing cavity 31 in portal member 30B, as shown in FIG. 10.
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The filter screen 60 may have a surface area. kano augmented available for bonding within the cavity eBRl GCfad fadutfrfcrt empty. Filter screen 60 can be secured to port 30B from within cavity 31 by bonding, cements, adhesives, or the like.
In one embodiment, filter stencil 62 is placed within cavity 31 with lips facing wound (Figure 8A and Figure 10). In another embodiment, the filter screen 62 is positioned within the lips 64 facing the vacuum port 30B and away from the wound (Figure 8B). In another embodiment, base 62 lacks lips 64, as shown in Figure 8C, and is substantially flat.
It is also considered that the filter screens 59 and can be provided in combination with a treatment element 61 comprising a therapeutic material, as shown in figure 11. The treatment element 61 can be inserted between the filter screens 59, 60 and can be secured to a vacuum port 30B by an appropriate adhesive bond. The treatment element 61 and the filter screens 59, 60 can define an insert for reception in the cavity or opening 31 on the underside of the portal member 30B. This distribution can provide a convenient method of treating exudate from a wound as it is removed from wound w. Treatment element 61 may comprise fibrous or granular materials contained in a container facilitating placement between Treatment element 61
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may include tale &<sup>dU! mat</sup> as activated charcoal or other substances for the elimination or neutralization of odors. Treatment element 61 may include antibacterial substances such as polyhexamethylene biguanide (PHMB). Furthermore, antimicrobial substances such as metal ions or biguinides can be included to reduce the biological load of the exudate or the microbial load within the exudate as the exudate is withdrawn into the collection container 28. In an alternative, the filter screens 59, 60 may comprise charcoal, antimicrobial substances, and odor eliminating substances.
Vacuum tube 30 can be configured to accept a variety of pipe geometries such as round, oblong, or elliptical. Vacuum port 30 can be provided as a pre-attached component of dressing 16, as part of vacuum system 12, or completely separate. Also, vacuum port 30 may not be necessary, depending on the configuration of dressing 16.
Vacuum dressing 16 generally includes a contact layer 34, a filler 38 and a reinforced cover layer 40. The reinforced cover layer 40 can be formed of a support composite material, a reinforcement layer 46, and wound dressing layer 16 as follows.
The contact layer
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which includes a layer 44
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an adhesive layer 4 8 * pity described in greater detail may be sufficiently conformable to be placed in direct contact with an irregularly shaped surface of a wound bed w. A thin film of polyethylene or other suitable non-adherent material may be formed to the contact layer 34 to limit the adherence of the filler 38 and other wound substances w. Openings or perforations in the film allow fluids to pass through contact layer 34, allowing subatmospheric pressure to penetrate wound w and free exudates to flow out of wound w. By selecting an appropriate film material, the wound exudate conduit through contact layer 34 can be controlled such that wound exudate is prevented from flowing back into the wound. To promote unidirectional flow, a tapered perforated film, such as that provided by Tredegar Film Products of Richmond, VA, can be selected to form the contact layer 34. This type of film is distributed with perforations placed in the cone-shaped conformation peaks in the film material so that the exudate finds the film as an arrangement
<img file="MX336239B_D0027.tif" />
LsJ of micro-funnels in one direction and a collection container arrangement in the .ñst. . Mexican other. Although a square configuration is shown, the shape of the contact layer 34 can be tailored to better match the wound geometry. Unidirectional flow of exudates can also be promoted by selecting other materials that include lamination of layers that have variable absorption characteristics.
An exemplary material, which can be used as a contact layer, is sold under the trademark XEROFLO.<sup>mr</sup> by Kendall Corp., a division of
Covidien.
The filler 38 can be placed on the contact layer 34 to fill the wound w at the level of the surrounding healthy skin s or they can overfill the wound w, as shown in Figure 4A. An absorbent material such as a non-woven gauze or crosslinked foam can be used for filler 38 to trap or transport any exudate that travels through contact layer 34. An antimicrobial dressing sold under the trademark KERLIX<sup>mr</sup> by Kendall Corp., a division of Covidien may be suitable for use as' filler 38. To prevent wound adhesion W filler 38 may also comprise a material configured such that any loose fiber does not tend to protrude through the perforations of the contact layer 34 where they can be packed by fabric
ινι
<img file="MX336239B_D0028.tif" />
new. A particular type of Mexican toitituto characteristic with f recodedd ^ rafHedad Industriar manufacturing procedure for granulation of material formation that presents this denominated as tow. Synthetic fibers often includes extrusion of an undetermined length of continuous filaments, which are spun together to form fibers. They are the continuous lengths of the non-spun filaments which are denoted by tow. A single length of tow formed from a hydrophobic material such as polyolefin can be laid in the wound bed w to form the filler 38. This distribution allows complete separation of the filler 38 when the dressing 16 is changed without it re-setting. damage the wound w.
Cover layer 40 can be placed over wound w by enclosing contact layer 34 and padding 38 therein. The periphery of cover layer 40 extends laterally beyond the perimeter of wound bed w so that it contacts healthy skin s to form a seal on wound w. As it is shown in
<td>the figure</td><td> 2,</td><td>the</td><td>cap</td><td> 48</td><td>adhesive can be extended to</td><td>the</td>
<td>periphery</td><td>of</td><td>the</td><td>cap</td><td> 40</td><td>cover to provide</td><td>the</td>
<td>stamp with</td><td>the</td><td>use</td><td>of</td><td>a</td><td>pressure sensitive adhesive</td><td>of</td>
medical degree. The adhesive layer 48 can be adapted to provide jin fluid-tight and bacteria-tight seal around the peripheral region of dressing 16 of
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<img file="MX336239B_D0030.tif" />
Macano ñro ^ ledad Industrial esta del (10 <sup>18</sup>
EM ^ jS
ΊΙοΊΙ such that exudate cannot escape through edges of dressing 16 and cannot enter the area of external air and contaminants. To provide barrier, the adhesive layer 48 can be, for example, in the order of 25 gm (1.0 thousandths of an inch) to 254 gm thousandths of an inch) depending on the adhesive used. In general, a high tear strength adhesive can be used to resist inadvertent or wavy lift ie, a failure of the dressing to adhere to itself or the patient, at the edges of the cover layer 40. The adhesive defining adhesive layer 48 may include, but is not limited to, medical grade acrylics, rubber base, or silicone adhesives. Preferably, those adhesives included with the dressing sold under the trademark Polyskin II Transparent Dressings by Kendall Corp., a division of Covidien, are those that can be used. Adhesive layer 48 forms a continuous band around the peripheral region of cover layer 40, but contains an opening such that the adhesive layer does not extend inward to the central areas of cover layer 40.
As shown in FIG. 3, the backing layer 46 may overlap the adhesive layer 48 at the outer edge so that the outer periphery of the backing layer 46 is firmly attached to the backing layer 44. The layer
<img file="MX336239B_D0031.tif" />
The reinforcing layer extends into a peripheral region cTeTa cover layer 40 but not necessarily external to cover layer 40. The cape on a perimeter.
of the reinforcing grade X ^ USfflCrt 'particularly any portion that does not overlap with the adhesive layer 48 can be affixed to the support layer 44 with a light coating of an adhesive applied to the appropriate side of the reinforcing layer 46 or layer 44 support.
the wound the oriented towards
One portion on one side
<td>layer 46</td><td>of</td><td>reinforcement no</td><td>it has adhesive,</td><td colspan="2">to avoid</td>
<td>accession</td><td>of</td><td>layer 4 0</td><td>from cover to</td><td>filling</td><td>3 8. One</td>
<td>opening</td><td colspan="2">54 extends to</td><td colspan="2">through layer 46 of</td><td>reinforcement</td>
<td colspan="2">to allow</td><td>communication</td><td>fluid between the</td><td>Deposit</td><td>14 and the</td>
<td>system</td><td>12 of</td><td>empty.</td><td></td><td></td><td></td>
understand a mesh
The reinforcing layer 46 may be made of polyethylene terephthalate (PET) fibers, which provides good resistance to liquids, making it suitable for use in a wet wound environment.
PET fibers can be used to form a woven or non-woven backing that has large pore sizes.
Some reinforcement of
PET provide the interlacing of fiber bonds to provide a mesh that is flexible in multiple directions and also does not tear when cut. One such method is known as hydroentangling.
The reinforcements of
PET manufactured in this way tend to have high shear stiffness so that they are reinforcing the cover layer 40. A material which may be suitable for incorporation into 'Β
Μ
Ρ
<img file="MX336239B_D0032.tif" />
cano ej plaster taftoffedac! <img file="MX336239B_D0033.tif" /> Industrial reinforcing layer 46 is sold under the trade name Sontara<sup>1</sup>® by DuPont. Alternatively, the reinforcing layer 46 may be formed of another reinforcing or mesh structure that has adequate tear stiffness. Examples of suitable structures include extruded lattice and perforated films.
Suitable materials for use in such alternative structures include PET, polyethylene, nylon, and woven structures can be used for the backing layer. Acceptable woven materials may include cotton gauze, woven acetate, and nylon.
Extending to the periphery of the cover layer 4 0 is the support layer 44. Backing layer 44 provides a substrate to which backing layer 46 and adhesive layer 48 can be attached. An opening 56 extends through the support layer 44 to allow fluid communication between the tank 14 and the vacuum system 12. Backing layer 44 can be formed of a flexible polymeric membrane that serves as a fluid barrier to allow subatmospheric pressure to be established in vacuum reservoir 14, and also as a microbial barrier that prevents contaminants from entering the area
<img file="MX336239B_D0034.tif" />
<img file="MX336239B_D0035.tif" />
of the wound. For example, the backing layer 44 can Instituto Mexicano film of polyurethane that has softness<img file="MX336239B_D0036.tif" /> Industrial to understand a
<img file="MX336239B_D0037.tif" />
thickness from about μιη (0.8 thousandths inch) to about inch).
Preferably, support layer 44 is formed of a moisture vapor permeable membrane to promote the exchange of oxygen and moisture vapor between the wound site and the atmosphere. An exemplary material is a transparent membrane sold under the trade name POLKYSKIN<sup>MR</sup> II by Kendall Corp., a division of Covidien. Other materials which may be suitable for use in the backing layer include thin films sold under the names TEGADERM.<sup>mr</sup> 3M St. Paul, MN and OPSITE<sup>MR</sup> from Smith and Nephew PLC of London, UK. The reinforcing layer 46 can be configured to prevent moisture vapor transmission by including, for example, a large pore size.
As seen in Figure 4A, reservoir 14 is defined by or located within wound dressing 16 when placed on the skin. Filler 38 may be included to fill reservoir 14. Outflow of atmospheric gases from reservoir 14 may have a tendency to cover layer 4 0 to flatten against wound w, as shown in FIG. 4B. This
<img file="MX336239B_D0038.tif" />
<img file="MX336239B_D0039.tif" />
tendency of the covering layer 40 to deform pull the margins around the wound inside wound w and place the surrounding skin s in tension. This trend can be counteracted or counteracted by the anti-shear stiffness in the reinforcing layer 46 in ways that the covering layer 40 can better maintain its shape. Because the reinforcing layer 46 extends in the peripheral region of the covering layer 40 and the supporting layer 44 anchored to healthy skin, the forces associated with the evacuation tank 14 can be transferred beyond the perimeter of the Wound w and can manifest as compressive forces. In this way, the reinforcing layer 46 reinforces the cover layer 40 and the vacuum tank 14.
A central region of the reinforcing layer 46 may lack an adhesive coating, so that the reinforcing layer 46 may not tend to adhere or alter the filling 38, particularly as the reduced pressure is removed from the reservoir 14. The layer 46 Reinforcement in this way additionally protects the wound w to promote healing through the evacuation cycles of a VWT procedure.
Although the foregoing description has been described in some detail by way of illustration and example, for purposes of clarity or understanding, it will be apparent that
P<sup>can</sup> Mexican owed industrial property
- 23 may implement modifications within the scope of certain
<img file="MX336239B_D0040.tif" />
the attached claims nclusjfjgf.
It is noted that in relation to this date, the best method known by the applicant to put the aforementioned invention into practice is the one that is clear from the present description of the invention.
<img file="MX336239B_D0041.tif" />
The invention having been described above,
Contents12
48 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 15 Sheet 16 Sheet 17 Sheet 18 Sheet 19 Sheet 20 Sheet 21 Sheet 22 Sheet 23 Sheet 24 Sheet 25 Sheet 26 Sheet 27 Sheet 28 Sheet 29 Sheet 30 Sheet 31 Sheet 32 Sheet 33 Sheet 34 Sheet 35 Sheet 36 Sheet 37 Sheet 38 Sheet 39 Sheet 40 Sheet 41 Sheet 42 Sheet 43 Sheet 44 Sheet 45 Sheet 46 Sheet 47 Sheet 48
73 members in 17 offices
Priority claims3
| Document | Office | Kind | Date |
|---|---|---|---|
| 61036275 | United States of America | – | |
| 3627508 | United States of America | P | |
| 2009037127 | United States of America | W |
Members73
| Document | Office | Kind | |
|---|---|---|---|
| GB9318714D0 | United Kingdom | D0 | |
| IL108271A0 | Israel | A0 | |
| US5355777A | United States of America | A | |
| GB2281848A | United Kingdom | A | |
| CA2106749A1 | Canada | A1 | |
| DE4332563A1 | Germany | A1 | |
| FR2710511A1 | France | A1 | |
| AU4742493A | Australia | A | |
| NL9302217A | Netherlands (Kingdom of the) | A | |
| BR9400111A | Brazil | A | |
| NZ250272A | New Zealand | A | |
| FR2710511B1 | France | B1 | |
| CA2106749C | Canada | C | |
| AU666969B2 | Australia | B2 | |
| CH686607A5 | Switzerland | A5 | |
| IL108271A | Israel | A | |
| GB2281848B | United Kingdom | B | |
| DE4332563C2 | Germany | C2 | |
| HK1000459A1 | Hong Kong, China | A1 | |
| CA2718424A1 | Canada | A1 | |
| CA2718425A1 | Canada | A1 | |
| CA2963650A1 | Canada | A1 | |
| US2009234307A1 | United States of America | A1 | |
| US2009234309A1 | United States of America | A1 | |
| WO2009114786A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2009114790A2 | World Intellectual Property Organization (WIPO) | A2 | |
| WO2009114790A3 | World Intellectual Property Organization (WIPO) | A3 | |
| WO2009114786A3 | World Intellectual Property Organization (WIPO) | A3 | |
| US2010232448A1 | United States of America | A1 | |
| WO2010105013A1 | World Intellectual Property Organization (WIPO) | A1 | |
| MX2010010133A | Mexico | A | |
| EP2252247A2 | European Patent Office (EPO) | A2 | |
| EP2254647A2 | European Patent Office (EPO) | A2 | |
| MX2010010132A | Mexico | A | |
| CN102015007A | China | A | |
| CN102015008A | China | A | |
| EP2406723A1 | European Patent Office (EPO) | A1 | |
| US8152785B2 | United States of America | B2 | |
| US8249072B2 | United States of America | B2 | |
| US2012243542A1 | United States of America | A1 | |
| EP2254647A4 | European Patent Office (EPO) | A4 | |
| EP2252247A4 | European Patent Office (EPO) | A4 | |
| CN102015007B | China | B | |
| CN102015008B | China | B | |
| US8537828B2 | United States of America | B2 | |
| EP2254647B1 | European Patent Office (EPO) | B1 | |
| ES2547405T3 | Spain | T3 | |
| US9199012B2 | United States of America | B2 | |
| EP2959933A1 | European Patent Office (EPO) | A1 | |
| MX336239BThis record | Mexico | B | |
| US2016074232A1 | United States of America | A1 | |
| US9375353B2 | United States of America | B2 | |
| EP3053555A1 | European Patent Office (EPO) | A1 | |
| US2016317357A1 | United States of America | A1 | |
| CA2718424C | Canada | C | |
| CA2718425C | Canada | C | |
| US10188555B2 | United States of America | B2 | |
| US2019216651A1 | United States of America | A1 | |
| EP2959933B1 | European Patent Office (EPO) | B1 | |
| EP2252247B1 | European Patent Office (EPO) | B1 | |
| EP2406723B1 | European Patent Office (EPO) | B1 | |
| ES2761290T3 | Spain | T3 | |
| EP2254647B2 | European Patent Office (EPO) | B2 | |
| ES2547405T5 | Spain | T5 | |
| EP2252247B2 | European Patent Office (EPO) | B2 | |
| EP2959933B2 | European Patent Office (EPO) | B2 | |
| US11523943B2 | United States of America | B2 | |
| ES2761290T5 | Spain | T5 | |
| US2023190534A1 | United States of America | A1 | |
| EP3053555B1 | European Patent Office (EPO) | B1 | |
| US12295814B2 | United States of America | B2 | |
| US2025268762A1 | United States of America | A1 | |
| US12472104B2 | United States of America | B2 |
2 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Transfer or rightsGB | GB | |
| Change of company name or juridical statusHC | HC |
Numbers
- Publication
- 336239
- Application
- 10132
Titles2
- Spanish
- APOSITO PARA HERIDAS RESISTENTE AL DESGARRE, PARA USO EN EL TRATAMIENTO DE HERIDAS AL VACIO.
- English
- SHEAR RESISTANT WOUND DRESSING FOR USE IN VACUUM WOUND THERAPY.
Classification
- CPC, 13
- A61F13/05
- A61F2013/00536
- A61F2013/0054
- A61M2205/7545
- A61F2013/00174
- A61M1/79
- A61M1/78
- A61M1/784
- A61M1/915
- A61M1/912
- A61M1/90
- A61F13/01029
- A61F13/01046
- IPC, 1
- A61F13 02