Surgery – Means for introducing or removing material from body for... – With means for cutting – scarifying – or vibrating tissue
Patent
1994-12-01
1996-01-30
Maglione, Corrine M.
Surgery
Means for introducing or removing material from body for...
With means for cutting, scarifying, or vibrating tissue
604 26, 604 27, 604 28, 604 51, A61B 1720
Patent
active
054877253
ABSTRACT:
A surgical instrument for the treatment of simple inferior or superior retinal detachments and a method of using the same. The surgical instrument has an elongated probe with an outer tube and an inner tube slidably engaged in the outer tube. Generally, the instrument has a cutting edge and an aspiration port connected to a vacuum. A non-expanding gas delivery channel, having an outer diameter approximately that of a 36 gauge needle (0.13 mm) is adjacent the outer tube. The overall outer diameter of the probe is less than that of a 23 gauge needle (0.635 mm). In use, the probe is inserted in the vitreous cavity through a small sclerotomy incision. The inner tube oscillates within the outer tube and vitreal material is drawn into the suction port, excised by the cutting edge, and removed by vacuum. Simultaneously, non-expanding gas is introduced through the gas channel to equalize intraocular pressure. The non expanding gas migrates to the retinal tear and urges the retinal tissue toward the choroid forcing subretinal fluid from behind the retina through the tear. The instrument is withdrawn and the sclerotomy is self-sealing or requires one suture. 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 is separate from the vitrectomy probe. Another embodiment of the vitrectomy probe has an extension tip on the distal end positioned between the aspiration port and the retinal tissue to urge the retinal tissue away from the aspiration port to prevent aspiration and further damage to the retina.
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Gring N. Kent
Maglione Corrine M.
Syntec Inc.
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