Estudo macroscópico e dinamométrico comparativo de implantes (ímãs recobertos) e de suas técnicas de fixação em órbitas de coelhas

Kleinpaul, Elcio Roque; Bicas, Harley E. A.

doi:10.1590/s0004-27492004000300025

Cited by 2 publications

(1 citation statement)

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“…For practical reasons (the difficulty of shaping the permanent magnets), it is easier to fix the permanent magnet to the orbit (or externally to it) and the ferromagnetic material to the eye. Previous studies have shown that small pieces of steel fixed to the eye produce only an initial inflammatory response (18)(19)(20)(21) and could bear external tractions of up 80 gf (18,20) . At first glance, it would appear that small elements fastened to the eye and to the orbit (Figure 6 A) would be preferable.…”

Section: Structure Of Possible Magnetic Circuitsmentioning

confidence: 99%

A major problem in strabismus and its possible solution

Bicas¹

2014

Arquivos Brasileiros De Oftalmologia

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Purpose: One of the challenges in strabismus is to guarantee stability of the surgical corrections. Re-surgeries are often required even after careful diagnosis, planning, and execution. Several factors contribute to this undesired outcome and the existing management strategies are ineffective. The present alternative is to compensate for their consequences. Ocular rotations are evoked by muscular contractions and relaxations (active forces). During eye movement, periocular tissues are stretched, storing part of the kinetic energy, which may be posteriorly recovered (passive forces), whereas the remaining part of the energy is lost via friction and inelastic deformations (dissipative forces). A method for measuring the forces that cause post-surgery eye drift has not been reported. However, this may be indirectly determined as a function of the respective mechanical variables. The estimated ratio between the kinetic energies of a post-surgery eye drift and a normal pursuit eye movement is ~10 -15 . Theoretically, it can be expected that the addition of continuously acting forces of such magnitudes to the oculomotor system might prevent the undesired post-surgery eye movement. Methods: Several methods for increasing the restraining, dissipative forces to ocular rotations may be conceived. One method is to increase the friction to ocular movements, as for instance, by periocular injection of viscous substances. Another possibility is to use the forces of a magnetic field, which may stabilize the eye in a desired position without avoiding the rotations caused by greater muscular forces acting on it. It has been demonstrated that these forces neutralize the nystagmic movements, whose intensities of mechanical variables are much higher than those of a post-surgery eye drift. Some models of application of this technique are then discussed. Small magnets fixed to the orbit and metallic ferromagnetic elements fixed to the sclera to cover a suitable extension appears to be the best method for providing starting and sliding friction to the oculomotor system. Results: Weak magnetic fields do not cause ocular ill effects. Additionally, the ma g netic field may be confined to the elements of the circuit and may not leak. However, the magnetic materials may interfere with magnetic resonance image (MRI) examinations. requires a detailed clinical examination and the capability to correctly interpret the collected data. Examples of diagnostic errors include unobserved muscular dysfunction and an association between the vertical and horizontal deviations, or the "V" pattern. A second factor is the surgical planning, which require a deep knowledge of the theme and excellent strategic experience necessary to relate the diagnostic findings to the expected surgical outcome. Poor selection of the extraocular muscles to be operated on or procedures to be performed on each muscle leads to undesired outcomes. The third factor is the A major problem in strabismus and its possible solution Um grande problema no estrabismo e suas po...

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