| 摘要 |
<p>A surgical instrument (10) for the treatment of retinal detachments and a method of using the same. The surgical instrument has an elongated probe (12) with an outer tube (14) and an inner tube (20) slidably engaged therein. The instrument has a cutting edge (26) and an aspiration port (25) connected to a vacuum. A non-expanding gas delivery channel (28) is adjacent the outer tube. The outer diameter of the probe is 0.635 mm. The probe (10) is inserted in the vitreous cavity through a small sclerotomy incision. The inner tube (20) oscillates within the outer tube (14) and vitreal material is drawn into the suction port (25), excised by the cutting edge (26), and removed by vacuum. Simultaneously, non-expanding gas is introduced through the gas channel (28) to equalize intraocular pressure. The non-expanding gas urges the retinal tissue toward the choroid forcing subretinal fluid from behind the retina. The retinal tear is permanently attached by application of cryocoagulation or laser photocoagulation. In another embodiment of the method, the non-expanding gas delivery channel (240) is separate from the vitrectomy probe (202). Another embodiment of the vitrectomy probe has an extension tip (214) on the distal end to urge the retinal tissue away from the aspiration port.</p> |
