{
    "title": "Irreversible Electroporation for Cancer Ablation",
    "inventor_name": "Rafael V. Davalos & Boris Rubinsky",
    "publication_year": 2007,
    "device_name": "Irreversible Electroporation (IRE) device",
    "goal": "Destroy cancerous tissue non-thermally using short intense electric pulses while preserving surrounding healthy structures.",
    "problem_addressed": "Current tumor ablation methods (heat, freezing, chemicals) damage healthy tissue or lack precise control; a minimally invasive, non-thermal technique is needed.",
    "concept_summary": "Irreversible electroporation (IRE) applies a series of short, high-voltage electric pulses through needle-like electrodes placed in or around a tumor. The pulses create permanent nanopores in cell membranes, leading to cell death without significant Joule heating, thus preserving blood vessels and extracellular matrix.",
    "detailed_description": "The invention consists of a set of percutaneous electrodes (typically metal such as platinum or stainless steel) connected to a pulse generator capable of delivering micro-second to millisecond pulses at amplitudes sufficient to exceed the electroporation threshold (~kV/cm). The electrode array is positioned using imaging (ultrasound, CT, MRI) to encompass the target lesion. Pulse parameters (amplitude, duration, number, repetition rate) are tuned to achieve irreversible membrane permeabilization while keeping temperature rise below thermal damage levels. In vivo studies in Sprague-Dawley rats and mice demonstrated >90 % tumor cell kill and preservation of vascular architecture. The device is intended for clinical use in prostate, liver, breast, kidney, and brain tumors, either alone or in combination with chemotherapeutic agents.",
    "category": "Medical & Dental Technologies",
    "principles": [
        "Irreversible electroporation",
        "Membrane permeabilization",
        "Electric field-induced cell death"
    ],
    "scientific_domains": [
        "Bioengineering",
        "Biomedical Engineering",
        "Electrical Engineering",
        "Oncology"
    ],
    "mechanisms_of_action": [
        "Creation of permanent nanopores in cell membranes",
        "Disruption of cellular homeostasis leading to apoptosis/necrosis",
        "Preservation of extracellular matrix and vasculature due to non-thermal mechanism"
    ],
    "materials": [
        "Platinum electrodes",
        "Stainless steel electrodes",
        "Insulating polymer coating (e.g., PTFE) for needle shafts"
    ],
    "energy_sources": [
        "Electrical pulses from a capacitor-based pulse generator"
    ],
    "inputs": [
        "Electrical pulse parameters (amplitude, duration, number)",
        "Electrode placement guided by imaging",
        "Target tissue geometry"
    ],
    "outputs": [
        "Irreversible cell membrane pores",
        "Cell death within the treated volume",
        "Preserved blood vessel architecture"
    ],
    "claimed_performance": "Destroyed 92 % of tumors in mice in a one-minute test; successful ablation of liver tissue in male Sprague-Dawley rats without drug use; selective killing of tumor cells with minimal thermal damage.",
    "experimental_evidence": "In-vivo animal experiments reported in IEEE Transactions on Biomedical Engineering (June 2006) and UPI news (July 2007) showing tumor ablation in rats and mice; patent application describing the method and device.",
    "replication_status": null,
    "keywords": [
        "Irreversible electroporation",
        "IRE",
        "Tumor ablation",
        "Non-thermal cancer treatment",
        "Electric pulses",
        "Minimally invasive surgery"
    ],
    "related_technologies": [
        "Radiofrequency ablation",
        "Cryosurgery",
        "Focused ultrasound",
        "Nanosecond pulsed electric fields (nsPEF)"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.7,
    "fringe_score": 0.2,
    "evidence_strength": 0.6,
    "risk_score": 0.3,
    "trl_estimate": 5,
    "source_urls": [
        "http://public.ca.sandia.gov/microfluidics/staff-pages/rdavalos/index.php",
        "http://www.tcrt.org/OpenAccess/Rub_TCRT_6_4_255.pdf",
        "http://www.whatsnextnetwork.com/technology/index.php/2007/07/06/irreversible_electroporation_kills_cance",
        "http://www.upi.com/Health_Business/Analysis/2007/07/02/analysis_electricity_used_to_kill_cancer/9858/print_view/",
        "US Patent Application #2007 0043345"
    ],
    "organizations": [
        "Sandia National Laboratories",
        "Virginia Tech - Wake Forest University School of Biomedical Engineering and Science",
        "University of California, Berkeley",
        "National Institutes of Health"
    ],
    "applications": [
        "Ablation of solid tumors (prostate, liver, breast, kidney, brain)",
        "Adjunct to chemotherapy (enhanced drug delivery)",
        "Minimally invasive surgical oncology"
    ],
    "limitations": [
        "Potential collateral damage to healthy cells within the electric field",
        "Requirement for precise imaging and electrode placement",
        "Limited penetration depth for larger tumors",
        "No published human trial data at time of article"
    ],
    "open_questions": [
        "Optimal pulse parameters for different tissue types",
        "Long-term safety and immune response after IRE",
        "Integration with real-time imaging modalities",
        "Effectiveness in combination with chemotherapeutic agents",
        "Scalability to large-volume tumors"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The researchers successfully ablated tissue using the IRE pulses in the livers of male Sprague-Dawley rats. We did not use any drugs, the cells were destroyed, and the vessel architecture was preserved.",
        "In laboratory experiments, a one-minute test utilizing irreversible electroporation destroyed 92 percent of tumors in mice.",
        "IRE removes tumors by irreversibly opening tumor cells through a series of short intense electric pulses from small electrodes placed in or around the body.",
        "The key to this is that it is relatively simple to perform in places such as community hospitals or in resource-limited setting."
    ]
}