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Evaluation of patency using photo-plethysmography on endoscope images

An endoscopic, unobstructed technology, applied in the direction of endoscopy, use of light for diagnosis, application, etc., can solve problems such as inaccessibility to surgeons, flow obstruction, etc.

Active Publication Date: 2015-03-18
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, successful revascularization of an artery may not necessarily result in successful perfusion of the myocardium since flow in smaller vessels (which are not visible on conventional imaging) may also be able to be occluded
Additionally, these imaging modalities are often not available to surgeons

Method used

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  • Evaluation of patency using photo-plethysmography on endoscope images
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  • Evaluation of patency using photo-plethysmography on endoscope images

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Embodiment Construction

[0019] In accordance with the principles of the present invention, systems and methods are provided for determining fluid flow in a region of interest using light emitted or reflected from tissue. In one embodiment, photoplethysmography (PPG) is used to assess blood flow in tissue. PPG uses light reflection or transmission to detect cardiovascular pulse waves passing through the body. PPG is based on the principle that blood absorbs more light than surrounding tissue, so changes in blood volume affect transmission or reflection accordingly. The PPG signal can be used to detect respiration rate and heart rate using only a CCD camera and ambient light illumination. The systems and methods described herein can extract, for example, green and blue pixel intensities from a region of interest on a CCD camera-based image, and then measure their changes over time. Other information can also be extracted and monitored. A higher amplitude signal corresponds to a higher reflectivity a...

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Abstract

A system for evaluating patency includes a light sensor (128) positionable relative to a blood vessel to receive light from the blood vessel and convert the light into an image signal. Aphoto-plethysmography (PPG) interpretation module (115) is configured to receive the image signal and output pixel values in an image representing PPG information. An image generation module(148) is coupled to the PPG interpretation module to receive the pixel values and generate a PPG map to be output to a display for analysis.

Description

technical field [0001] The present disclosure relates to medical devices and procedures, and more particularly to monitoring fluid flow in tissue using photoplethysmographic (PPG) information. Background technique [0002] During heart bypass surgery, surgeons use one or more blood vessels from the body to bypass atherosclerotic patients with narrowed coronary arteries. The intent of this procedure is to increase blood flow in the coronary arteries, which supply the heart's myocardial tissue. During minimally invasive (MI) heart bypass surgery, an elongated instrument is inserted into a small incision in the patient's chest, and an endoscope provides visualization. In robotic-guided MI cardiac bypass surgery, one or more of the instruments (or endoscopes) are controlled by a robotic device. Heart bypass surgery can be performed while the patient is on cardiopulmonary bypass and the heart is in cardiac arrest, or while the heart is beating. [0003] X-ray angiography or ul...

Claims

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Application Information

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IPC IPC(8): A61B5/00A61B1/00A61B5/0295
CPCA61B5/0261A61B5/1459A61B5/0295A61B5/7285A61B5/061A61B1/0005A61B19/2203A61B34/30A61B5/0084A61B5/4851A61B2034/301A61B5/489A61B1/00006A61B1/00009A61B5/0059A61B5/0082
Inventor H·埃尔哈瓦林A·波波维奇W·韦尔克鲁杰塞
Owner KONINKLJIJKE PHILIPS NV
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