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Retzius-Sparing Robot-Assisted Radical Prostatectomy

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Multipurpose surgical robot as a laparoscope assistant.

Carl A Nelson¹, Xiaoli Zhang, Bhavin C Shah

¹Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA. cnelson5@unl.edu

Surgical Endoscopy

|December 30, 2009

Summary

A new compact surgical robot enhances laparoscope guidance during minimally invasive surgery, offering stable imaging and reducing operating room crowding. This robotic system improves surgeon control and visualization compared to human assistants.

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Area of Science:

Minimally Invasive Surgery
Surgical Robotics
Medical Device Engineering

Background:

Human laparoscope guidance in surgery often lacks consistency due to assistant inexperience, fatigue, and shakiness.
Operating room crowding is a common issue, potentially hindering surgical team efficiency and instrument access.
Current methods for laparoscope control present challenges in maintaining a stable and optimal field of view.

Purpose of the Study:

To evaluate the effectiveness of a novel compact surgical robot in improving laparoscope guidance.
To assess the robot's ability to provide stable and consistent surgical imaging.
To determine if the robotic system can reduce operating room crowding and interference with surgical instruments.

Main Methods:

A 4-degree-of-freedom compact robot utilizing a bevel-geared spherical mechanism was designed and constructed.
The robot manipulated a laparoscope through a 15-mm port in a porcine model, controlled by a surgeon via joystick.
Surgical visualization was recorded using external digital video recorders and internal laparoscope feeds, supplemented by robot position data.

Main Results:

The robot demonstrated effective manipulation of the laparoscope, providing clear and consistent views of internal organs.
The system's range of motion matched human assistant capabilities and was precisely controlled via joystick.
Robot position data confirmed highly stable imaging during surgical procedures.

Conclusions:

The compact, table-mounted surgical robot significantly enhances imaging stability in laparoscopic surgery.
The robotic system optimizes operating room space, increasing standing room and reducing interference with surgical tools.
This robotic approach shows potential for integration with flexible endoscopes, enabling enhanced dexterity and visualization.