This invention relates generally to the wound healing arts, and more particularly to a novel wound healing apparatus for removing excess fluid from a wound by absorbing the fluid into the dressing or suctioning the fluid through the dressing and out of the wound.
The present invention is directed to a wound dressing having a suction member adaptable for connection to a source of vacuum pressure and a semi-permeable cover overlying the suction member for attaching the dressing to a patient's skin surrounding a wound. The semi-permeable cover allows the wound to breathe while protecting the wound from undesirable substances such as bacteria, viruses, or fluids. When connected to a source of vacuum pressure, the suction member removes excess fluid from the wound and the semi-permeable cover facilitates circulation of sterile air in the wound, both of which promote healing of the wound. The wound dressing preferably has a hydrophobic or biodegradable base layer and one or more absorptive layers for absorbing fluid from the wound. The absorptive layers are preferably quilted with patches containing desiccant, adsorbent, or absorbent material. When the absorptive layers become saturated with fluid, they may be removed from the wound and replaced with fresh absorptive layers. Alternatively, the wound dressing may have one or more semi-absorbent stabilizing layers that allow fluid to pass through the suction member. If fluid is allowed to pass through the suction member, a fluid lock is preferably provided downstream from the suction member to prevent fluid from reaching the source of vacuum pressure. Any of the base layers, absorptive layers, or stabilizing layers may have medicine embedded therein to further promote healing.
A bladder is preferably provided with the dressing for distributing contact pressure away from the wound. Various sensors may be provided in the wound dressing for sensing various physiological parameters in the wound, such as oxygen saturation, blood pressure, respiratory rate, blood glucose, carbon dioxide due to infection, ECG activity, and serous fluid turbidity. The dressing may have electrical leads for providing electrical stimulation to the wound. Medicine may also be applied to the wound through one or more conduits in the wound dressing. This invention may be used with animals as well as humans.
Referring to
As shown in
Referring to
As mentioned above, wound dressing 10 of
As is known in the art, PHA material degrades into CO2 and water, and the rate of degradation is markedly increased by elevated levels of bacteria. Thus, if a wound containing PHA material is infected, the bacteria will break down the PHA material at a faster rate, which will increase the rate of production of CO2. Accordingly, if a wound dressing in accordance with the present invention includes PHA material as discussed above, the dressing also preferably includes a CO2 sensor as a means of monitoring the wound for infection. The CO2 sensor may be provided either as part of the wound dressing itself or downstream as part of the suction tube or vacuum source that is connected to the wound dressing. The CO2 sensor may provide a visual or audible indication if the CO2 reaches or exceeds a certain predetermined level as is known in the art so that a caregiver may check the wound for infection. The YSI 8500 CO2 sensor available from YSI Incorporated (Yellow Springs, Ohio) is an example of a suitable CO2 sensor that is adaptable for use in accordance with the present invention.
Persons of ordinary skill in the art will appreciate that the various suction members disclosed herein may be used with either an absorptive dressing, such as dressing 10 described above, or a flow-through dressing, such as dressing 140 described above. Additionally, although the semi-permeable covers 16 and 60 described above preferably have an adhesive on the underside for attaching the dressing to the skin surrounding the wound, the dressing may be attached to the patient with a separate adhesive member overlapping the perimeter of the semi-permeable cover. Also, a wound dressing in accordance with the present invention comprising a suction member, a semi-permeable cover, and any desired base layers, absorptive layers, and stabilizing layers may be provided as an integrated unit rather than as separate pieces. Further, a wound dressing in accordance with the present invention, including the suction member if made of plastic or other suitable material, may be trimmed to fit any desired shape of wound. Additionally, any of the sensors described herein may be used with any of the dressings described herein.
Although preferred embodiments described herein preferably include one or more base layers, absorptive layers, or stabilizing layers as discussed above, a basic embodiment of the present invention may simply have a suction member and a semi-permeable cover overlying the suction member without any base layers, absorptive layers, or stabilizing layers. When connected to a source of vacuum pressure, the suction member effectively removes fluid from the wound and the semi-permeable cover facilitates circulation of sterile air to the wound, both of which promote healing of the wound. Likewise, the biodegradable or absorptive layers disclosed herein may be used to advantage to help heal wounds without a suction member or a semi-permeable cover.
Although the foregoing specific details describe a preferred embodiment of this invention, persons reasonably skilled in the art will recognize that various changes may be made in the details of this invention without departing from the spirit and scope of the invention as defined in the appended claims. Therefore, it should be understood that this invention is not to be limited to the specific details shown and described herein.
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