Surgical apparatus for radial keratotomy
First Claim
1. Radial keratotomy apparatus comprising a support having:
- an axis of the support,a concave reference surface secant to the axis of the support and adapted to fit the cornea of an eye in a position in which the axis of the support coincides with the optical axis of the eye,a plurality of slots of which each is arranged with a respective plane including the axis of the support and opens into a zone of the reference surface each slot permitting the passage of a blade of such a type that said blade has an active part forming a projection determined with respect to the reference surface and can move in the plane of the slot between two determined limits, respectively of approach and extension of the active part of the blade with respect to the axis of the support,characterised in that the support has a plurality of blades of which each is associated with a respective slot, and means, arranged behind the reference surface for bringing about simultaneous displacement of the blades with respect to the support, in the respective associated slots and in their respective planes, from a first of the two said respective determined limits to the second of these two respective determined limits and at the said respective determined projection of an active part of each blade.
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Accused Products
Abstract
The present invention relates to apparatus for radial ketatotomy. A support (1), having a reference surface (3) adapted to fit the cornea (2a) of an eye (2) and in which opens slits (19) disposed in planes including an axis (4) adapted to coincide with the optical axis (105), carries blades (22) of which each is associated with a respective slit (19), and means for simultaneously moving the assembly of blades (22) for a movement in the associated slits (19) towards or away from the axis (4); the blades (22), projecting with respect to the reference surface (3), then simultaneously cut the cornea (2a), advantageously pressed pneumatically against the reference surface (3). The simultaneous making of all the incisions is rapid, and the blades work in identical conditions so the incisions have reproducible geometric characteristics and the risks of perforation of the cornea are reduced.
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Citations
36 Claims
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1. Radial keratotomy apparatus comprising a support having:
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an axis of the support, a concave reference surface secant to the axis of the support and adapted to fit the cornea of an eye in a position in which the axis of the support coincides with the optical axis of the eye, a plurality of slots of which each is arranged with a respective plane including the axis of the support and opens into a zone of the reference surface each slot permitting the passage of a blade of such a type that said blade has an active part forming a projection determined with respect to the reference surface and can move in the plane of the slot between two determined limits, respectively of approach and extension of the active part of the blade with respect to the axis of the support, characterised in that the support has a plurality of blades of which each is associated with a respective slot, and means, arranged behind the reference surface for bringing about simultaneous displacement of the blades with respect to the support, in the respective associated slots and in their respective planes, from a first of the two said respective determined limits to the second of these two respective determined limits and at the said respective determined projection of an active part of each blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Radial keratotomy apparaus comprising a support having:
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an axis of the support, a concave reference surface secant to the axis of the support and adapted to fit the cornea of an eye in a position in which the axis of the support coincides with the optical axis of the eye, a plurality of slots of which each is arranged with a respective plane including the axis of the support and opens into a zone of the reference surface, each slot permitting the passage of a blade of such a type that said blade has an active part forming a projection determined with respect to the reference surface and can move in the plane of the slot between two determined limits, respectively of approach and extension of the active part of the blade with respect to the axis of the support, characterised in that it comprises; an annular carrier arranged around the axis of the support, and behind the reference surface, means for guiding the carrier in translation with respect to the support parallel to the axis of the support, means defining two stable, determined limit positions of the carrier with respect to the reference surface of the support on the said translation of the carrier with respect to the support, means for manoeuvring at will the carrier in translation with respect to the support between the said limit positions, a plurality of blade carriers of which each is associated with a respective slot and pivotally mounted on the carrier about a respective axis perpendicular to the said plane of the associated slot, a plurality of blades of which each is fixed to a respective blade carrier, the said blade being arranged in the said plane of the associated slot and having across the associated slot an active part in the region of the reference surface the said active part being withdrawn with respect to the reference surface in a first of said limit positions of the said carrier with respect to the reference surface and forming a projection with respect to the reference surface (3,203) in the second of these two limit positions, means for fixing each of the blades to the associated blade carrier, means defining two stable, determined limit positions of each blade-carrier pivotally with respect to the carrier defining themselves the said two determined limits, respectively of approach and extension of the active part of the blade with respect to the axis of the support, means for manoeuvring at will the assembly of blade-carriers pivotally with respect to the carrier about the said pivot axis, so that the active parts of the blades are moved together from a first of the said limits, respective of approach to and extension from the axis of the support, to the second of these two limits. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification