Surgery – Truss – Pad
Patent
1975-02-03
1976-08-24
Pace, Channing L.
Surgery
Truss
Pad
308121, A61B 1732, A61F 900
Patent
active
039760774
ABSTRACT:
An ophthalmic surgical device including a housing having an extension sleeve projecting from one end thereof. A rotary shaft, having helical threads at one end thereof, which threads terminate in a cutting tip, is disposed within the extension sleeve with the tip being exposed at the free end of the sleeve. The shaft is mounted within three fluid-lubricated sleeve bearings. One of the bearings is mounted within the sleeve adjacent to the tip thereof with its central axis offset and slightly angled with respect to the axes of the other bearings to effect the bending and slight loading of the shaft. The bearings are lubricated by water provided under pressure thereto and serve to enable the shaft to rotate at a high rate of speed under the force provided by an air turbine. Means are provided for supplying a working fluid to the cutting tip of the device to aid in the maceration of the material to be removed by the tool. The macerated material and the working fluid are withdrawn from the operative site by the pumping action of the rotating helical threads of the shaft. The water pressure on the bearings not only lubricates the bearings but also precludes the macerated material and working fluid from being pumped into the interior of the housing.
REFERENCES:
patent: 908539 (1909-01-01), Beutler
patent: 2584770 (1952-02-01), Wilcock
patent: 3639074 (1972-02-01), Killick
patent: 3736938 (1973-06-01), Evvard et al.
patent: 3835858 (1974-09-01), Hagen
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