| 摘要 |
<p>Apparatus for the treatment of ocular misalignment by electrical stimulation of ocular recti. A body implantable unit develops an electrical stimulation signal and delivers that signal to an ocular rectus without restricting its contraction. In a preferred embodiment, the implanted unit includes a receiving member 15 which cooperates with an external transmitting unit, the external transmitting unit establishing the stimulation signal parameters. The receiving member 15 is connected to a lead 16 carrying an electrode 17 which is shaped so as to contact the ocular rectus 12 without interfering with its contraction. Preferably, the stimulation signal is a periodically interrupted train of pulses, the repetition rate of the stimulation signal pulses being within the range of 50 to 100 pulses per minute. The interruption of the pulse train results in a stochastic stimulation with the pulse train being delivered for approximately 1 to 5 seconds with the interval between stimulation signals being from approximately 5 to 25 seconds. The pulse amplitude may be selectively established in the range from about 0.8 to 15 volts with the pulses having a pulse width of approximately 0.22 milliseconds. During stimulation, a divergence movement is attained to correct the ocular alignment while chronic stimulation results in a histological and an atomical change in the stimulated rectus which tends to overcome the ocular misalignment. </p> |
