Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/05—Bandages or dressings; Absorbent pads specially adapted for use with sub-pressure or over-pressure therapy, wound drainage or wound irrigation, e.g. for use with negative-pressure wound therapy [NPWT]
• • 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
  • A61M1/91—Suction aspects of the dressing
  • A61M1/915—Constructional details of the pressure distribution manifold
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods
  • A61B17/08—Wound clamps or clips, i.e. not or only partly penetrating the tissue ; Devices for bringing together the edges of a wound
  • A61B17/085—Wound clamps or clips, i.e. not or only partly penetrating the tissue ; Devices for bringing together the edges of a wound with adhesive layer
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B46/00—Surgical drapes
  • A61B46/20—Surgical drapes specially adapted for patients
  • A61B2046/205—Adhesive drapes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B2217/00—General characteristics of surgical instruments
  • A61B2217/002—Auxiliary appliance
  • A61B2217/005—Auxiliary appliance with suction drainage system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B46/00—Surgical drapes

Definitions

• the present invention relates generally to medical treatment systems and in particular to a reduced-pressure system and method employing a gasket.
• reduced pressure is applied to tissue through a porous pad or other manifolding device.
• the porous pad contains cells or pores that are capable of distributing reduced pressure to the tissue and channeling fluids that are drawn from the tissue.
• a pneumatic seal is achieved over the dressing using a semi-permeable drape that is sealed to the patient's epidermis.
• an adhesive has been used at times or a sealing tape.
• healthcare providers have navigated the difficult task of using sealing material to form strips around the wound before placing the drape over the dressing and wound.
• a dressing is applied and usually is periodically changed. This typically means that the dressing is changed with some frequency — often three times a week or more. When such changes take place, the sealing tape is removed. This can cause irritation to the periwound region and pain to the patient.
• a reduced-pressure treatment system for treating a tissue site on a patient includes a gasket releasably attached around a perimeter of the tissue site; a manifold sized and configured to be placed in contact with the tissue site; an over-drape positioned over the manifold and sealed to the gasket to create a sealed space between the over-drape and the tissue site; and a reduced-pressure source fluidly coupled to the sealed space to deliver reduced pressure to the tissue site.
• the gasket may be operable to remain in place for an extended time.
• a method for treating a tissue site on a patient with reduced pressure includes the steps of: releasably attaching a gasket around a perimeter of the tissue site; placing a manifold in contact with the tissue site; disposing an over-drape over the manifold; sealing the over-drape to the gasket to create a sealed space between the over-drape and the tissue site; and providing reduced pressure to the sealed space to treat the tissue site.
• the illustrative embodiment of the systems and methods of the present invention may provide for a number of perceived advantages. A few examples follow.
• Technical advantages of the present invention may include that system is relatively easy to apply. Another advantage is the system may be easier on the periwound region of the epidermis. Another advantage is that the patient may experience relatively reduced or eliminated pain associated with dressing changes. Another advantage is that the likelihood of pneumatic leak is decreased. These are only some examples.
• FIGURE 1 is a schematic, perspective view with a portion in cross-section of an illustrative embodiment of a reduced-pressure system employing a gasket;
• FIGURE 2 is a schematic, plan view of an illustrative embodiment of a gasket disposed circumferentially around a tissue site;
• FIGURE 3 is a schematic, perspective view of an illustrative embodiment of a dispenser for applying an illustrative gasket to a periwound area of a patient's epidermis;
• FIGURE 4 is a schematic, cross-sectional view of a portion of an illustrative embodiment of a reduced-pressure system employing a gasket.
• System 100 may include a manifold member 108, or simply manifold; an over-drape 110; and a reduced-pressure subsystem 1 12.
• System 100 includes gasket 128.
• the manifold member 108 is made from a porous and permeable foam-like material and, more particularly, a reticulated, open-cell polyurethane or polyether foam that allows good permeability of wound fluids while under a reduced pressure.
• manifold generally refers to a substance or structure that is provided to assist in applying reduced pressure to, delivering fluids to, or removing fluids from a tissue site.
• a manifold typically includes a plurality of flow channels or pathways that are interconnected to improve distribution of fluids provided to and removed from the area of tissue around the manifold.
• manifolds may include without limitation devices that have structural elements arranged to form flow channels, cellular foam, such as open-cell foam, porous tissue collections, and liquids, gels, and foams that include or cure to include flow channels.
• the manifold material might also be a combination or layering of materials; for example, a first manifold layer of hydrophilic foam might be disposed adjacent to a second manifold layer of hydrophobic foam to form the manifold member 108.
• the reticulated pores of the Granufoam ® material are helpful in carrying out the manifold function, but again other materials may be used.
• a material with a higher, or lower, density (smaller pore size) than Granufoam® material may be desirable in some situations.
• the manifold member 108 may also be a reticulated foam that is later felted to thickness of about 1/3 its original thickness. Among the many possible materials, the following might be used: Granufoam® material or a Foamex technical foam (www.foamex.com).
• the manifold member 108 could be a bio-absorbable material or an anisotropic material.
• the over-drape 118 covers the manifold member 108 and extends past a peripheral edge 114 of the manifold member 108 to form a drape extension 116.
• Drape extension 116 has a first side 118 and a second, patient-facing side 120.
• Drape extension 116 may be sealed against a gasket 128 by sealing apparatus 124, such as an adhesive 126.
• Sealing apparatus 124 may take numerous forms, such as an adhesive sealing tape, or drape tape or strip; double-side drape tape; adhesive 126; paste; hydrocolloid; hydrogel; or other sealing means. If a tape is used, it may be formed of the same material as the over-drape 110 with a pre-applied, pressure-sensitive adhesive.
• Pressure-sensitive adhesive 126 may be applied on a second, patient-facing side 120 of drape extension 116.
• Adhesive 126 provides a substantially pneumatic seal between the over-drape 110 and the gasket 128. Before the over-drape 110 is secured to the patient, removable strips covering the adhesive 126 may be removed.
• Over-drape 110 may be an elastomeric material that has pore sizes less than about 20 microns, but other materials and sizes might be used.
• "Elastomeric” means having the properties of an elastomer and generally refers to a polymeric material that has rubber-like properties. More specifically, most elastomers have elongation rates greater than 100% and a significant amount of resilience. The resilience of a material refers to the material's ability to recover from an elastic deformation.
• elastomers may include, but are not limited to, natural rubbers, polyisoprene, styrene butadiene rubber, chloroprene rubber, polybutadiene, nitrile rubber, butyl rubber, ethylene propylene rubber, ethylene propylene diene monomer, chlorosulfonated polyethylene, polysulfide rubber, polyurethane, EVA film, co-polyester, and silicones.
• over-drape materials may include a silicone, 3M Tegaderm® drape material, acrylic drape material, such as one available from Avery, or an incise drape material.
• Gasket 128 has a gasket material 130 with a first side 132 and a second, patient-facing side 134.
• a second attachment apparatus 136 may be coupled to the second side 134 of the gasket material 130 for releasably attaching the gasket 128 to the patient's epidermis 106, or more generally skin.
• the gasket material 130 may be a thin polymer film, such as polyurethane, polyester, silicone, or a hydrocolloid, or could include any suitable gasket material.
• the second attachment apparatus 136 holding the gasket 128 in place may be a relatively water-resistant material, such as an Avery® brand Wet-stick adhesive, a colloid, acrylic, polyisobutylene (PIB), etc.
• the second attachment apparatus 136 allows the gasket 128 to be held in place for an extended time, e.g. one to two weeks or more, and then to be removed.
• the over-drape 110 may be re-attachable to the gasket 128 should the clinician find a need to view the wound and re-attach the over-drape 110. This allows the gasket 128 to stay in place for an extended time without significant agitation of the periwound area of the epidermis 106.
• Reduced-pressure subsystem 112 includes a reduced-pressure source 140, which can take many different forms.
• Reduced-pressure source 140 provides a reduced pressure as a part of system 100.
• the term "reduced pressure" as used herein generally refers to a pressure less than the ambient pressure at a tissue site 104 that is being subjected to treatment. In most cases, this reduced pressure will be less than the atmospheric pressure at which the patient is located. Alternatively, the reduced pressure may be less than a hydrostatic pressure of tissue at the tissue site 104. It is often desirable for the reduced-pressure source 140 to develop a continuous reduced pressure below atmospheric pressure and also be able to deliver a dynamic pressure, i.e., to vary the reduced pressure in a cycle or operate in a continuous or intermittent mode.
• the operable range of reduced pressure may vary widely as needed, but would typically include 200 mm Hg below atmospheric.
• increasing the reduced pressure it typically refers to increasing the absolute value of the negative gauge pressure
• likewise, when one speaks of decreasing the reduced pressure it typically means that the absolute value of the negative gauge pressure is decreasing.
• reduced-pressure source 140 having a reservoir region 142, or canister region.
• An interposed membrane filter such as hydrophobic or oleophobic filter, might be interspersed between a delivery conduit, or tubing, 144 and the reduced-pressure source 140.
• a medial portion 146 of conduit 144 may have one or more devices, such as device 148.
• the device 148 might be another fluid reservoir, or collection member to hold exudates and other fluids removed.
• Other examples of devices 148 that might be included on the medial portion 146 of delivery conduit 144 include pressure-feedback devices, volume detection systems, blood detection systems, infection detection system, flow monitoring systems, temperature monitoring systems, etc. Some of these devices may be formed integral to the reduce-pressure source 140.
• a reduced-pressure port 141 on reduced-pressure source 140 may include a filter member that includes one or more filters, e.g., an odor filter.
• reduce-pressure source 140 The reduced pressure developed by reduce-pressure source 140 is delivered through the delivery conduit 144 to a reduced-pressure interface 150, which might be an elbow port 152.
• port 152 is a TRAC ® technology port available from
• Interface 150 allows the reduced pressure to be delivered through over-drape 110 and realized within sealed space 154.
• elbow port 152 extends through over-drape 110 and into manifold member 108.
• FIGURE 2 an illustrative embodiment of a gasket 200 is shown disposed circumferentially about wound 202. A small margin 204 is shown at the wound edge 206. It will be appreciated from FIG. 2 that irregular shaped wounds, such as wound 202, should be accommodated.
• One way to accommodate the irregular shape is to attach gasket 200 using a gasket tape, i.e., a gasket material with attachment means that can be applied to the patient like a tape.
• FIGURE 3 shows an illustrative embodiment of a gasket tape dispenser 300.
• Gasket tape dispenser 300 dispenses gasket 302, or gasket tape, which has a gasket material 304 and an attachment apparatus 306.
• the dispenser 300 may take many forms, but in this embodiment, contains a first chamber portion 308, which holds a roll of gasket tape 302.
• the healthcare provider can thus use the dispenser 300 to dispense gasket 302 about the perimeter of the tissue site proximate wound 310 on or through epidermis 311. To do so, the dispenser 300 is moved in the direction shown by arrow 314.
• the second chamber 312 may include a spring-loaded spindle that pulls the removed backing material on to it.
• the gasket 302 might be dispensed.
• the healthcare provider treating a wound 202 may, after appropriately cleaning and preparing the periwound region, apply a gasket 200 about the wound 202 using a dispenser, such as dispenser 300 in FIG. 3, or otherwise placing the gasket 200 proximate the wound 202.
• the gasket 200 provides a long-lasting perimeter about the wound 202 that facilitates attachment of an over-drape and that allows the over- drape to be removed without requiring the gasket 200 to be removed.
• long-lasting it is meant that the gasket 200 could remain attached and operable for as long as one to two weeks or even longer.
• the over-drape 110 may be placed over the wound 102 and attachment apparatus 124 used to secure the over-drape 110 to the gasket 128 and in particular to releasably attach drape extension 116 to the gasket 128.
• attachment apparatus 124 is an adhesive layer 126 and requires removal of a removable backing before application.
• over-drape 110 is sealed, it provides the pneumatically sealed space 154.
• the reduced-pressure interface 150 is applied through over- drape 110 to allow reduced pressure from reduced-pressure subsystem 112 to reach the manifold 108.
• the reduced-pressure subsystem 112 may be activated and reduced pressure supplied to manifold 108 in sealed spaced 154.
• Gasket 406 has a sealing apparatus 408 on a second, patient-facing side 410 that holds and seals the gasket 406 in a long-lasting way to the patient's epidermis 412.
• the over-drape 402 is secured using a bead 414 of adhesive applied to the first side 404 of the gasket 406 and against a second, patient-facing side 416 of over-drape 402.
• the bead 414 may be applied using an applicator similar to a caulk gun.
• a material capable of drying and adhering to a patient's epidermis periwound might be painted on or sprayed on and allowed to dry.

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• Health & Medical Sciences (AREA)
• Heart & Thoracic Surgery (AREA)
• Public Health (AREA)
• Vascular Medicine (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Veterinary Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Anesthesiology (AREA)
• Hematology (AREA)
• Media Introduction/Drainage Providing Device (AREA)
• Gasket Seals (AREA)
• Surgical Instruments (AREA)
• Materials For Medical Uses (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (11)

Cited By (3)

Families Citing this family (34)

Citations (10)

Family Cites Families (130)

• 2008
  • 2008-08-20 CA CA2697040A patent/CA2697040C/en active Active
  • 2008-08-20 CN CN200880102347XA patent/CN101778602B/zh active Active
  • 2008-08-20 EP EP08798294.8A patent/EP2180837B1/en active Active
  • 2008-08-20 JP JP2010522000A patent/JP5394383B2/ja active Active
  • 2008-08-20 AU AU2008288966A patent/AU2008288966B2/en active Active
  • 2008-08-20 WO PCT/US2008/073749 patent/WO2009026385A1/en not_active Ceased
  • 2008-08-20 US US12/195,115 patent/US8211071B2/en active Active
  • 2008-08-20 RU RU2010102860/14A patent/RU2010102860A/ru unknown
  • 2008-08-20 KR KR1020107005991A patent/KR20100052542A/ko not_active Withdrawn
  • 2008-08-21 TW TW097131923A patent/TW200930419A/zh unknown
• 2010
  • 2010-03-18 ZA ZA201001940A patent/ZA201001940B/xx unknown
• 2012
  • 2012-06-04 US US13/487,763 patent/US8556871B2/en active Active
• 2013
  • 2013-09-12 US US14/025,271 patent/US9345823B2/en active Active
• 2016
  • 2016-04-22 US US15/135,754 patent/US9642954B2/en active Active

Patent Citations (10)

Non-Patent Citations (1)

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