Reversible Peristaltic Pump and Other Structures for Reflux in Eye Surgery
3 Assignments
0 Petitions
Accused Products
Abstract
Devices, systems, and methods for treatment of an eye alter aspiration flow from the eye in response to an occlusion of the aspiration conduit pathway. Where aspiration is drawn from the eye using a volumetric pump, the pump can be reversed so as to induce fluid reflux from the aspiration conduit pathway into the eye to help clear the occlusion. The pump may vary the reverse flow in response to sensed aspiration pressure or the like, and the reverse flow may be halted before the pressure within the aspiration conduit pathway adjacent the eye significantly exceeds the irrigation fluid pressure and/or the pressure within the eye. Reflux may alternatively be generated by modulating a vent valve disposed between an irrigation conduit pathway and the aspiration conduit pathway.
18 Citations
22 Claims
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1-12. -12. (canceled)
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13. An eye treatment method comprising:
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directing an irrigation flow into the eye through an irrigation conduit pathway; aspirating material from within the eye by drawing an aspiration flow through an aspiration conduit pathway; in response to an occlusion of the aspiration flow, the occlusion inducing a compliant reduction in volume of the aspiration conduit pathway, introducing fluid into the aspiration conduit pathway; and controlling the introduction of fluid into the aspiration conduit pathway in response to a pressure along the aspiration conduit pathway by changing the pump speed to provide a reduced reverse flow rate when the pressure in the aspiration conduit pathway is at atmospheric pressure and so that a maximum reflux pressure within the aspiration conduit pathway adjacent the eye is less than or substantially equal to an irrigation flow pressure adjacent the eye, and so that reflux into the eye is largely generated by momentum in the aspiration conduit pathway toward the eye.
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14. An eye treatment system comprising:
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an eye treatment probe; an eye treatment console having a controller and an aspiration pump drive; and a cassette coupling the probe to the controller, the cassette having an irrigation conduit pathway for directing an irrigation flow into the eye via the probe, the cassette and probe having an aspiration conduit pathway coupled to the pump for aspirating material from within the eye; a pressure sensor for providing a sensed pressure indicating pressure within the aspiration conduit pathway; a first function correlating the sensed pressure and a reverse pump speed, or correlating the sensed pressure and a reverse flow rate; a second function correlating the sensed pressure and the reverse pump speed, or correlating the sensed pressure and the reverse flow rate; the controller configured to select between the first function and the second function when the sensed pressure is within a predetermined pressure range, the controller further configured to control the reverse pumping flow rate based on the selected function. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. An eye treatment method comprising:
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directing an irrigation flow into the eye through an irrigation conduit pathway; aspirating material from within the eye by drawing an aspiration flow through an aspiration conduit pathway with a pump; and in response to an occlusion of the aspiration flow, reversing the pump and refluxing fluid from the aspiration conduit pathway and into the eye to help clear the occlusion.
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Specification