Flow reduction hood systems

• US 8,417,321 B2
• Filed: 08/24/2011
• Issued: 04/09/2013
• Est. Priority Date: 02/02/2005
• Status: Active Grant

• Current Assignee: Intuitive Surgical Operations, Inc. (Intuitive Surgical Holdings, LLC)
• Original Assignee: Voyage Medical, Inc.
• Inventors: Saadat, Vahid, Tam, Edmund, Rothe, Chris A., Miller, David, Peh, Ruey-Feng
• Primary Examiner(s): Le, Long V.
• Assistant Examiner(s): EVOY, NICHOLAS LANE
• Application Number:
  US13/216,683
• Publication Number:
  US 20110306833A1
• Time in Patent Office: 594 Days
• Field of Search: None
• US Class Current: 600/476
• CPC Class Codes: A61B 1/0008 characterised by distal tip features
• CPC Class Codes: A61B 1/00089 Hoods
• CPC Class Codes: A61B 1/00148 using anchoring means
• CPC Class Codes: A61B 1/00165 with light-conductive means, e.g. fibre optics A61B1/07 takes precedence
• CPC Class Codes: A61B 1/015 Control of fluid supply or evacuation
• CPC Class Codes: A61B 1/018 for receiving instruments
• CPC Class Codes: A61B 1/05 characterised by the image sensor, e.g. camera, being in the distal end portion
• CPC Class Codes: A61B 1/051 Details of CCD assembly
• CPC Class Codes: A61B 1/12 with cooling or rinsing arrangements
• CPC Class Codes: A61B 1/3137 for examination of the interior of blood vessels
• CPC Class Codes: A61B 1/32 Devices for opening or enlarging the visual field, e.g. of a tube of the body dilators A61M29/00
• CPC Class Codes: A61B 17/29 Forceps for use in minimally invasive surgery
• CPC Class Codes: A61B 18/00 Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body eye surgery A61F9/007; ear surgery A61F11/00
• CPC Class Codes: A61B 18/18 by applying electromagnetic radiation, e.g. microwaves radiation therapy A61N5/00
• CPC Class Codes: A61B 5/6851 Guide wires
• CPC Class Codes: A61B 6/503 for diagnosis of the heart

Abstract

Flow reduction hood systems are described which facilitate the visualization of tissue regions through a clear fluid. Such a system may include an imaging hood having one or more layers covering the distal opening and defines one or more apertures which control the infusion and controlled retention of the clearing fluid into the hood. In this manner, the amount of clearing fluid may be limited and the clarity of the imaging of the underlying tissue through the fluid within the hood may be maintained for relatively longer periods of time by inhibiting, delaying, or preventing the infusion of surrounding blood into the viewing field. The aperture size may be controlled to decrease or increase through selective inflation of the membrane or other mechanisms.

Claims

1. An apparatus configured to control fluid flow for visualization, comprising:

a barrier projecting distally from a deployment catheter and defining an open area therein, wherein the open area is in fluid communication with at least one lumen defined through the catheter;

at least one membrane extending over a distal opening defined by the barrier such that the membrane partially covers the open area and further defines at least one aperture through the membrane, wherein the aperture has a size which is less than a diameter of the barrier to control a flow of a clearing fluid through the aperture and to an environment external to the barrier, the fluid being infused within the open area via the at least one lumen; and

an imaging element positioned to image the open area through the clearing fluid.

2. The apparatus of claim 1 further comprising an energizable element positioned proximal to the aperture.

3. The apparatus of claim 2 wherein the energizable element is advanceable through the open area.

4. The apparatus of claim 2 wherein the energizable element positioned within the barrier.

5. The apparatus of claim 1 wherein the aperture is controllable to variably alter its diameter.

6. The apparatus of claim 1 wherein the aperture comprises at least one slotted opening which extends in an arcuate or curved manner over the membrane.

7. The apparatus of claim 1 further comprising a dilator which is translatable relative to the barrier, wherein distal translation of the dilator engages the aperture and transitions the barrier to a low-profile configuration.

8. The apparatus of claim 1 wherein the aperture has a diameter of 1 to 4 mm.

9. The apparatus of claim 1 wherein the imaging element comprises a CCD, CMOS, or optical fiber imager.

10. A method for controlling fluid flow, comprising:

positioning a barrier in an expanded configuration projecting distally from a deployment catheter and defining an open area therein proximate or adjacent to a tissue region of interest, wherein at least one membrane extends over a distal opening defined by the barrier such that the membrane partially covers the open area;

infusing a clearing fluid into the open area while visualizing through the open area such that an opaque fluid is purged at least partially from the open area and to an environment external to the barrier through at least one aperture defined along the membrane; and

inhibiting the flow of the clearing fluid from the open area through the at least one aperture which has a size which is less than a diameter of the barrier.

11. The method of claim 10 wherein visualizing within the open area comprises imaging the open area via a CCD, CMOS, or optical fiber imager.

12. The method of claim 10 further comprising adjusting a size of the at least one aperture.

13. The method of claim 10 further comprising advancing a dilator into the open area such that the dilator engages the aperture.

14. The method of claim 10 further comprising advancing an instrument into the open area to treat tissue underlying the barrier.

15. The method of claim 10 further comprising ablating the tissue while visualizing through the open area.

16. The method of claim 15 wherein ablating the tissue comprises ablating the tissue defined by the at least one aperture.