RESUMO
Iatrogenic nerve damage is a leading cause of morbidity associated with many common surgical procedures. Complications arising from these injuries may result in loss of function and/or sensation, muscle atrophy, and chronic neuropathy. Fluorescence image-guided surgery offers a potential solution for avoiding intraoperative nerve damage by highlighting nerves that are otherwise difficult to visualize. In this work we present the development of a single camera, dual-mode laparoscope that provides near simultaneous display of white-light and fluorescence images of nerves. The capability of the instrumentation is demonstrated through imaging several types of in situ rat nerves via a nerve specific contrast agent. Full color white light and high brightness fluorescence images and video of nerves as small as 100 µm in diameter are presented.
RESUMO
PURPOSE: Patients suffer from complications as a result of unintentional nerve damage during surgery. We focus on improving intraoperative visualization of nerves through the use of a targeted fluorophore and optical imaging instrumentation. PROCEDURE: A myelin-targeting fluorophore, GE3111, was synthesized, characterized for its optical and myelin-binding properties using purified myelin basic protein, and evaluated in mice. Additionally, a compact instrument was adapted to visualize nerves. RESULTS: GE3111 was synthesized using a versatile methodology. Its optical properties were sensitive to the local environment both in vitro and in vivo. Following intravenous injection, central and peripheral nerves were visualized, with the kinetics of nerve uptake modifiable depending on the formulation. Fluorescence polarization showed specific and strong binding to purified myelin basic protein. Nerves were visualized in vivo using a dedicated compact imaging device requiring less than 2.5 mW/cm(2) of illumination at 405 nm. CONCLUSIONS: Fluorescence imaging of nerves through myelin showed a potential for use in image-guided surgery. Intraoperative nerve imaging is an example where contrast agent and instrument development come together as a result of clinical need.
Assuntos
Compostos de Anilina , Meios de Contraste , Diagnóstico por Imagem/métodos , Bainha de Mielina/patologia , Nervos Periféricos/patologia , Sulfonamidas , Administração Intravenosa , Compostos de Anilina/síntese química , Compostos de Anilina/química , Compostos de Anilina/farmacocinética , Animais , Bovinos , Meios de Contraste/síntese química , Meios de Contraste/química , Meios de Contraste/farmacocinética , Relação Dose-Resposta a Droga , Período Intraoperatório , Masculino , Camundongos , Proteína Básica da Mielina/metabolismo , Fenômenos Ópticos , Especificidade de Órgãos , Solventes/química , Espectrometria de Fluorescência , Sulfonamidas/síntese química , Sulfonamidas/química , Sulfonamidas/farmacocinética , Cirurgia Assistida por ComputadorRESUMO
Fluorescence image-guided surgery (FIGS) is an emerging technique in oncology, neurology, and cardiology. To adapt intraoperative imaging for various surgical applications, increasingly flexible and compact FIGS instruments are necessary. We present a compact, portable FIGS system and demonstrate its use in cardiovascular mapping in a preclinical model of myocardial ischemia. Our system uses fiber optic delivery of laser diode excitation, custom optics with high collection efficiency, and compact consumer-grade cameras as a low-cost and compact alternative to open surgical FIGS systems. Dramatic size and weight reduction increases flexibility and access, and allows for handheld use or unobtrusive positioning over the surgical field.