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Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...

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Related Experiment Video

Updated: Jul 27, 2025

Design of an Open-Source, Low-Cost Bioink and Food Melt Extrusion 3D Printer

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Published on: March 2, 2020

A Low-cost 3D Printed Telescopic Sleeve: A Technical Note.

Salleh Hafeza^1,2, Shamsuddin Firdaus¹, Liang Chye Goh²

¹Department of Otorhinolaryngology, Hospital Sultanah Aminah, Johor Bahru, Malaysia.

Indian Journal of Otolaryngology and Head and Neck Surgery : Official Publication of the Association of Otolaryngologists of India

|June 5, 2023

Summary

A novel 3D printed telescopic sleeve for endoscopic nasal surgery allows continuous defogging and a clear view. This cost-effective device reduces the need to remove the telescope, improving surgical efficiency.

Keywords:

Adult Rhinology Endoscopy Outcomes/cost effectiveness

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Published on: August 30, 2018

Area of Science:

Otolaryngology
Medical Device Design
3D Printing

Background:

Endoscopic nasal surgery faces challenges with telescope defogging due to blood, smoke, and secretions.
Frequent removal of the Hopkins rod telescope for manual defogging disrupts the surgical workflow.

Purpose of the Study:

To design and fabricate a low-cost, 3D printed telescopic sleeve for endoscopic nasal surgery.
To enable continuous defogging of the telescope tip without removal from the nasal cavity.
To integrate suction and irrigation capabilities for maintaining a clear surgical field.

Main Methods:

Utilized 3D printing technology to create a custom telescopic sleeve.
Designed the sleeve to accommodate defogging solutions, suction, and irrigation.
Evaluated the sleeve's functionality in simulated endoscopic nasal surgery conditions.

Main Results:

Successfully designed and printed a functional 3D telescopic sleeve.
The sleeve facilitated continuous defogging and maintained a clear surgical view.
Demonstrated the sleeve's potential as a conduit for suction and irrigation.

Conclusions:

A 3D printed low-cost telescopic sleeve is a viable adjunct for endoscopic nasal surgery.
The device offers a cost-effective solution to improve surgical efficiency and visualization.
Further integration with other add-ons can enhance its utility in the operating room.