Quick-opening vent valve for phaco fluidics aspiration system
First Claim
1. A phacoemulsification surgical system, comprising:
- an irrigation system configured to provide an irrigating fluid to a surgical site; and
an aspiration system arranged to aspirate an aspirating fluid from the surgical site, the aspiration system comprising;
an aspiration path configured to direct the aspirating fluid away from the surgical site to an aspirating fluid drain; and
a cassette disposed in the aspiration path, the cassette comprising;
a pump interface portion configured to pass the aspirating fluid along the aspiration path to the aspirating fluid drain;
a vent path connecting the aspiration path to a vent reservoir bypassing the pump interface portion;
a valve chamber having a solid wall and a first opening in the solid wall, the first opening having a first edge portion between the solid wall and the first opening;
a vent valve disposed in the valve chamber and configured to selectively rotate between an open position and a closed position, the vent valve comprising a flow channel therethrough, the flow channel having a second opening selectively alignable with the solid wall in the closed position to prevent fluid flow therethrough and alignable with the first opening in the open position to permit fluid flow therethrough, the second opening of the vent valve having a second edge portion substantially complementary in shape to the first edge portion of the valve chamber, wherein the first edge portion of the valve chamber and the second edge portion of the vent valve pass each other as the vent valve transitions from the closed position to the open position;
wherein one of the first edge portions and the second edge portions has a convex shape;
wherein the other of the first edge portion and the second edge portion has a concave shape complementing the convex shape;
wherein the concave shape has a radius substantially the same as that of a circular shape; and
wherein the second opening of the flow channel comprises the concave shape and has an hour-glass shape including two concaving sides of the hour-glass shape.
4 Assignments
0 Petitions
Accused Products
Abstract
Apparatuses, systems, and methods are provided for rapid venting of vacuum to mitigate occlusion break surge within a phaco fluidics aspiration system. The aspiration system may utilize a positive displacement pump to generate flow and a vent valve to vent or moderate the pressure or vacuum level based on pressure sensor feedback detected within the eye and at the pump. Embodiments described herein provide a quick-opening vent valve that produces a quick-opening flow response upon angular rotation of the quick-opening vent valve. The flow performance at the quick-opening vent valve is improved by increasing the effective cross-sectional area of the valve at near-closed valve positions. In particular, the increase in the cross-sectional area is achieved by forming a concaving edge portion to complement a circular edge of and opening of a flow channel formed through the vent valve.
21 Citations
13 Claims
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1. A phacoemulsification surgical system, comprising:
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an irrigation system configured to provide an irrigating fluid to a surgical site; and an aspiration system arranged to aspirate an aspirating fluid from the surgical site, the aspiration system comprising; an aspiration path configured to direct the aspirating fluid away from the surgical site to an aspirating fluid drain; and a cassette disposed in the aspiration path, the cassette comprising; a pump interface portion configured to pass the aspirating fluid along the aspiration path to the aspirating fluid drain; a vent path connecting the aspiration path to a vent reservoir bypassing the pump interface portion; a valve chamber having a solid wall and a first opening in the solid wall, the first opening having a first edge portion between the solid wall and the first opening; a vent valve disposed in the valve chamber and configured to selectively rotate between an open position and a closed position, the vent valve comprising a flow channel therethrough, the flow channel having a second opening selectively alignable with the solid wall in the closed position to prevent fluid flow therethrough and alignable with the first opening in the open position to permit fluid flow therethrough, the second opening of the vent valve having a second edge portion substantially complementary in shape to the first edge portion of the valve chamber, wherein the first edge portion of the valve chamber and the second edge portion of the vent valve pass each other as the vent valve transitions from the closed position to the open position; wherein one of the first edge portions and the second edge portions has a convex shape; wherein the other of the first edge portion and the second edge portion has a concave shape complementing the convex shape; wherein the concave shape has a radius substantially the same as that of a circular shape; and wherein the second opening of the flow channel comprises the concave shape and has an hour-glass shape including two concaving sides of the hour-glass shape. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cassette for use in an aspiration system of a phacoemulsification surgical system, comprising:
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a pump interface portion configured to pass an aspirating fluid along an aspiration path; a vent path connecting the aspiration path to a vent reservoir bypassing the pump interface portion; a valve chamber having a solid wall and a first opening formed in the solid wall, the first opening having a first edge portion between the solid wall and the first opening; and a vent valve disposed in the valve chamber and configured to selectively rotate between an open position and a closed position, the valve chamber comprising a flow channel therethrough, the flow channel having a second opening selectively alignable with the solid wall in the closed position to prevent fluid flow therethrough and alignable with the first opening in the open position to permit fluid flow therethrough, the second opening of the vent valve having a second edge portion substantially complementary in shape to the first edge portion of the valve chamber, wherein the first edge portion of the valve chamber and the second edge portion of the vent valve passes each other as the vent valve transitions from the closed position to the open position; wherein one of the first edge portion and the second edge portion has a convex shape, and wherein the other of the first edge portion and the second edge portion has a concave shape complementing the convex shape; wherein the concave shape has a radius substantially the same as that of the convex shape; wherein the concave shape comprises an hour-glass shape including two concaving sides of the hour-glass shape. - View Dependent Claims (9, 10, 11)
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12. A rotary vent valve for use in a cassette installed in an aspiration system of a phacoemulsification surgical system, the rotary vent valve comprising:
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a motor engagement portion configured to engage a motor by which the rotary vent valve is rotated; and a body portion through which a flow channel and two openings of the flow channel are formed, wherein an edge portion of at least one of the two openings of the flow channel has a concave shape; wherein the at least one of the two openings of the flow channel has an hour-glass shape including the edge portion as one of two concave sides of the hour-glass shape. - View Dependent Claims (13)
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Specification