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Updated: Jul 7, 2026

Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery

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Published on: November 14, 2015

A deflectable video camera system for laparoscopic surgery based on shape memory alloy actuators.

Malte Pietsch¹, Konrad Henkel¹, René Körbitz¹

¹TUD Dresden University of Technology, Chair of Microsystems, Dresden, SN, Germany.

Scientific Reports

|April 2, 2025

Summary

This summary is machine-generated.

Shape memory alloy (SMA) actuators offer a lightweight, cost-effective solution for controlling flexible laparoscopic instruments. This study demonstrates a novel camera system with electronic deflection control, achieving over 178° of movement and long operational life.

Keywords:

Endoscopy Laparoscopic surgery Medical robotics Shape memory alloys Smart materials

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Area of Science:

Medical Devices
Robotics
Materials Science

Background:

Laparoscopic instruments lack deflectability, limiting usability in minimally invasive surgery.
Current flexible-tip devices are often heavy, expensive, and rely on manual controls.
Shape memory alloy (SMA) actuators present a promising alternative due to their light weight and cost-efficiency.

Purpose of the Study:

To develop and evaluate a laparoscopic video camera with electronic deflection control using SMA actuators.
To demonstrate the feasibility of SMA actuators for universal control of endoscopic instruments.
To investigate the performance and durability of the SMA-actuated camera system.

Main Methods:

Designed a laparoscopic camera with a two-degree-of-freedom tilt mechanism using a Nitinol joint.
Utilized an actuator unit with four SMA wires and a specialized tensioning mechanism.
Characterized system functionality using three assembled units and an automated measurement system.
Investigated the impact of continuous temperature stimulation on device parameters.

Main Results:

Achieved deflection angles exceeding 178° per degree of freedom.
Demonstrated suitable deflection behavior at operating frequencies up to 0.5 Hz.
Units maintained functionality for over 1200 actuation cycles or 4.4 hours of continuous operation.

Conclusions:

SMA actuators are feasible for the electrical control of flexible-tip laparoscopic instruments.
The developed camera system shows promising performance and durability.
Temperature control presents a key challenge for future development and optimization.