Abstract
In modern minimally invasive surgeries (MIS), standard laparoscopes suffer from the tradeoff between the spatial resolution and field of view (FOV). The inability of simultaneously acquiring high-resolution images for accurate operation and wide-angle overviews for situational awareness limits the efficiency and outcome of the MIS. A dual view multi-resolution foveated laparoscope (MRFL) which can simultaneously provide the surgeon with a high-resolution view as well as a wide-angle overview was proposed and demonstrated to have great potential for improving the MIS. Although experiment results demonstrated the high-magnification probe has an adequate magnification for viewing surgical details, the dual-view MRFL is limited to two fixed levels of magnifications. A fine adjustment of the magnification is highly desired for obtaining high resolution images with desired field coverage. In this paper, a high magnification probe with continuous zooming capability without any mechanical moving parts is demonstrated. By taking the advantages of two electrically tunable lenses, one for optical zoom and the other for image focus compensation, the optical magnification of the high-magnification probe varies from 2 × to 3 × compared with that of the wide-angle probe, while the focused object position stays the same as the wide-angle probe. The optical design and the tunable lens analysis are presented, followed by prototype demonstration.
Highlights
Laparoscope accelerates the development of modern medical surgeries
One of the major limitations is the tradeoff between the limited field of view (FOV) for high spatial resolution versus the wide FOV for situational awareness but with diminished resolution [2]
We proposed a multi-resolution foveated laparoscope (MRFL), which is capable of providing the surgeon with both a wide-angle view and a high-resolution view simultaneously though an integrated system [9]
Summary
Laparoscope accelerates the development of modern medical surgeries. It has become a standard instrument to perform a wide range of minimally invasive surgeries (MIS), such as cholecystectomy, appendectomy and hysterectomy [1]. Standard laparoscopes lack the ability to acquire both wide-angle and high-resolution images simultaneously through a single scope This limitation introduces challenges when used in scenarios requiring both close-up views for details and wide-angle overviews for orientation and situational awareness during surgical maneuvers. The compact ultra-high-definition endoscope [4] can reduce the instrument conflict while remaining high resolution, the zoom laparoscope [5,6] or zoom camera head [Stryker 1488 HD] can effectively change the optical magnification, change the field coverage and resolution; variable viewing direction laparoscopes [7,8] can change their view by varying its viewing direction optically or mechanically None of these existing solutions, are able to simultaneously acquire both wide-angle images and high-resolution images.
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