ABSTRACT
CASO CLÍNICO: Mujer de 22 años con hydrops corneal agudo y rotura de la membrana de Descemet. Se trató mediante una inyección de aire intracamerular combinada con múltiples incisiones intraestromales para conseguir el drenaje del líquido intraestromal. No hubo complicaciones intraoperatorias y el líquido intraestromal desapareció a las 2 semanas. DISCUSIÓN: El hydrops corneal agudo es una importante complicación del queratocono. Sin tratamiento, se puede resolver en un período de 2 a 4 meses. El edema persistente puede causar complicaciones tales como neovascularización corneal, infección y perforación
CASE REPORT: A 22-year- old woman with an acute hydrops and Descemet membrane detachment was managed by intracameral air injection combined with multiple corneal stromal venting incisions for the drainage of intrastromal fluid. No intraoperative complications were encountered, and the intrastromal fluid was resolved over 2 weeks. DISCUSSION: Acute corneal hydrops is a significant complication of keratoconus. If not treated, resolution usually occurs over a period of 2-4 months. The persistent oedema can cause complications, such as corneal neovascularisation, infection and corneal perforation
Subject(s)
Female , Humans , Edema/complications , Edema/metabolism , Punctures , Punctures/instrumentation , Descemet Membrane/abnormalities , Descemet Membrane/injuries , Pharmaceutical Preparations/administration & dosage , Pharmaceutical Preparations/metabolism , Edema/pathology , Punctures/classification , Punctures , Descemet Membrane/metabolism , Descemet Membrane/pathology , Pharmaceutical Preparations , Pharmaceutical Preparations/supply & distributionABSTRACT
BACKGROUND: Needle deflection and tissue deformation are two problems encountered during needle insertion into soft, non-homogeneous tissue. They affect the accuracy of needle placement, which in turn affects the effectiveness of needle-based therapies and biopsies. METHODS: In this study, a needle is inserted using a robot with two degrees of freedom. The needle is modelled as a flexible beam with clamped support at one end, and its deflection is estimated using online force/moment measurements at the needle base. To compensate for the needle deflection, the needle is axially rotated through 180 degrees . The needle deflection estimation data is used to find the insertion depths at which needle rotations are to be performed. RESULTS: A bevelled-tip needle was inserted into animal tissue. The needle deflection at the target was reduced by about 90%. It was observed that minimization of needle deflection reduced tissue deformation. The proposed method reduced needle deflection more than when needle insertion was performed with constant rotation. CONCLUSIONS: Estimating needle tip position using online force/moment measurement improves the accuracy of robot-assisted percutaneous procedures when imaging feedback is not available.
