Reflux control in microsurgical system

• US 20090124962A1
• Filed: 01/16/2009
• Published: 05/14/2009
• Est. Priority Date: 06/23/2006
• Status: Abandoned Application

• Current Assignee: Mark A. Hopkins, Shawn X. Gao
• Original Assignee: Mark A. Hopkins, Shawn X. Gao
• Inventors: Hopkins, Mark A., Gao, Shawn X.
• Application Number:
  US12/355,276
• Publication Number:
  US 20090124962A1
• Time in Patent Office: Days
• US Class Current: 604/24
• CPC Class Codes: A61F 9/00736 Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments A61F9/008 takes precedence
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/804 using Laval or Venturi jet pumps

Abstract

A microsurgical system capable of improving reflux via programmable, pre-defined reflux profiles and a pressure accumulator.

Claims

1. A method of controlling reflux in a microsurgical system, comprising:

providing a pressurized gas source, an aspiration chamber fluidly coupled to said pressurized gas source and containing a fluid disposed therein, a first valve fluidly coupled to said pressurized gas source and said aspiration chamber, a second valve fluidly coupled to said pressurized gas source and said aspiration chamber, an accumulator fluidly coupled to said pressurized gas source and said aspiration chamber between said first valve and said second valve, a pressure transducer fluidly coupled to said accumulator, and a computer electrically coupled to said first valve, said second valve, and said pressure transducer; and

creating a reflux pressure pulse in said aspiration chamber by using said computer to maintain said first valve in an open state and said second valve in a closed state, to allow pressurized gas to flow from said pressurized gas source through said first valve to form a pre-charge reflux pressure in said accumulator, to close said first valve, to open said second valve to discharge said pre-charge reflux pressure into said aspiration chamber, and to re-close said second valve.

2. The method of claim 1 wherein said first valve is a proportional valve.

3. The method of claim 2 wherein said formation of said pre-charge reflux pressure in said creating step further comprises:

using said pressure transducer to determine an actual pressure within said accumulator and to provide a first signal corresponding to said actual pressure to said computer;

using said computer to compare said actual pressure to a desired pressure within said accumulator and to provide a second signal to adjust said proportional valve in response to said comparison of said actual pressure to said desired pressure.

4. The method of claim 1 further comprising repeating said creating step to create multiple ones of said reflux pressure pulses in a repetitive manner.

5. The method of claim 4 wherein said repeating step is performed according to a pre-defined profile in said computer.

6. The method of claim 1 further comprising the step of providing a surgical device having a tip with an open port fluidly coupled to said aspiration chamber.

7. A method of controlling reflux in a microsurgical system, comprising:

providing a pressurized gas source, an aspiration chamber fluidly coupled to said pressurized gas source and containing a fluid disposed therein, a proportional valve fluidly coupled to said pressurized gas source and said aspiration chamber, a second valve fluidly coupled to said pressurized gas source and said aspiration chamber, an accumulator fluidly coupled to said pressurized gas source and said aspiration chamber between said proportional valve and said second valve, a pressure transducer fluidly coupled to said accumulator; and

a computer electrically coupled to said proportional valve, said second valve, and said pressure transducer;

creating a steady state reflux pressure in said aspiration chamber by;

using said computer to maintain said proportional valve and said second valve in an open state;

using said pressure transducer to determine an actual pressure within said accumulator and to provide a first signal corresponding to said actual pressure to said computer; and

using said computer to compare said actual pressure to a desired pressure within said accumulator and to provide a second signal to adjust said proportional valve in response to said comparison of said actual pressure to said desired pressure.

8. The method of claim 7 further comprising the step of providing a surgical device having a tip with an open port fluidly coupled to said aspiration chamber.