{
    "title": "Negative-Pressure Wound Healing Device",
    "inventor_name": "Danielle ZUROVCIK",
    "publication_year": 2010,
    "device_name": "Portable Human-Powered Negative-Pressure Wound Healing Device",
    "goal": "Accelerate wound healing and reduce dressing changes by providing low-cost, portable negative-pressure therapy in disaster and low-resource settings.",
    "problem_addressed": "Existing NPWT systems are heavy, expensive, and require electrical power, limiting their use in disaster zones and developing-world clinics.",
    "concept_summary": "A hand-operated bellows pump (<0.5 lb) creates continuous negative pressure over a wound dressing. An improved airtight seal reduces air leaks, cutting power demand from ~14 W to ~80 uW, allowing the device to be powered solely by manual compression.",
    "detailed_description": "The device consists of a simple bellows pump that is manually compressed to generate vacuum. A sponge is placed on the cleaned wound, covered with a plastic seal, and a tube connects the seal to the pump. The pump is housed in a lightweight casing and can be re-charged by hand as needed. The seal around the dressing and tube is reinforced with an elastomeric drape and a liquid cross-linked component to minimize air leakage. In field trials in Haiti, the device remained functional for days without re-charging and was reported to keep wounds cleaner and reduce dressing-change frequency.",
    "category": "Medical & Dental Technologies",
    "principles": [
        "Negative-pressure (vacuum) therapy",
        "Mechanical hand-pump operation",
        "Air-tight sealing to minimize leaks"
    ],
    "scientific_domains": [
        "Medicine",
        "Biomedical Engineering",
        "Wound Care"
    ],
    "mechanisms_of_action": [
        "Removal of wound exudate and bacteria via suction",
        "Reduction of edema",
        "Increased local blood perfusion",
        "Mechanical approximation of wound edges"
    ],
    "materials": [
        "Rubber/plastic bellows",
        "Medical sponge (non-adhesive dressing)",
        "Elastomeric drape (occlusive film)",
        "Liquid cross-linked sealant",
        "Plastic tube",
        "Adhesive tape"
    ],
    "energy_sources": [
        "Human manual effort (hand pump)"
    ],
    "inputs": [
        "Manual compression of bellows",
        "Ambient air (potential leaks)",
        "Wound exudate"
    ],
    "outputs": [
        "Continuous negative pressure (vacuum) at wound site",
        "Collected wound fluid"
    ],
    "claimed_performance": "Device costs ~= $3, weighs < 0.5 lb, and reduces power requirement from ~14 W to ~80 uW using a hand pump. Reported to keep wounds cleaner and cut dressing-change frequency.",
    "experimental_evidence": "Field use on eight patients in Haiti showed the device remained charged for days, kept wounds cleaner, and reduced the need for frequent dressing changes. No quantitative healing-rate data were collected.",
    "replication_status": "No independent replication reported; a larger trial in Rwanda is planned.",
    "keywords": [
        "negative pressure wound therapy",
        "NPWT",
        "portable medical device",
        "human-powered pump",
        "disaster medicine",
        "low-resource healthcare"
    ],
    "related_technologies": [
        "KCI V.A.C.(R) vacuum wound therapy system",
        "Battery-powered portable NPWT devices",
        "Mechanical bladder pumps",
        "Capillary-action dressings"
    ],
    "controversy_level": "low",
    "confidence_score": 0.8,
    "practicability_score": 0.7,
    "fringe_score": 0.2,
    "evidence_strength": 0.4,
    "risk_score": 0.2,
    "trl_estimate": 5,
    "source_urls": [
        "http://www.technologyreview.com/news/418098/a-cheap-portable-wound-healing-device/?a=f",
        "https://rexresearch.com/negativepressurewound/US2014031735.pdf"
    ],
    "organizations": [
        "Massachusetts Institute of Technology (MIT)",
        "Brigham and Women's Hospital",
        "Kinetic Concepts Inc. (KCI)"
    ],
    "applications": [
        "Disaster relief wound care",
        "Home therapy for chronic wounds",
        "Low-resource clinics in developing countries"
    ],
    "limitations": [
        "No quantitative clinical efficacy data",
        "Small sample size (8 patients)",
        "Seal integrity critical; leaks increase manual effort",
        "Manual pumping may be tiring for prolonged use"
    ],
    "open_questions": [
        "What is the optimal negative-pressure level achievable with a hand pump?",
        "How does long-term use affect seal durability?",
        "Can the device be scaled for larger or deeper wounds?",
        "What training is required for caregivers to maintain proper suction?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The researchers chose eight people ... appropriate for negative-pressure therapy.",
        "We learned that family members are interested in being trained and motivated to keep the device charged because they saw the benefits for their loved ones.",
        "It did seem to keep the wounds cleaner, says Riviello, and reduced the need to change bandages, which is painful for the patient.",
        "By improving the seal around the wound dressing to reduce air leaks, Zurovcik cut the pump's power requirements from about 14 watts to 80 microwatts, which comes from a hand pump."
    ]
}