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Relationship between biomedical catheter surface properties and lubricity as determined using textural analysis and
David S Jones1, Clare P Garvin, Sean P Gorman
1Medical Devices Unit, School of Pharmacy, The Queen's University of Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, Northern Ireland, UK. d.jones@qub.ac.uk
This study investigated how the surface properties of 12 different catheters affect their ease of removal from a biological-like medium. Using tensile analysis, the researchers measured the work required to pull catheters out of agar. Surface roughness was measured with atomic force microscopy, and water wettability was assessed using contact angle analysis. The results showed that smoother catheters generally required less force to remove. A regression model linked surface roughness to lubricity but found no strong connection between lubricity and wettability. The findings suggest that reducing surface roughness could improve catheter performance in clinical use.
Area of Science:
- Biomedical materials engineering
- Medical device design
- Surface science in clinical applications
Background:
Current research on medical devices often focuses on material properties, but the relationship between surface characteristics and functional performance remains unclear. Prior studies have shown that surface roughness and wettability influence device interaction with biological tissues. However, no prior work had resolved how these properties collectively affect catheter lubricity. This gap motivated a detailed analysis of catheter surface properties and their impact on ease of removal. The study aimed to clarify whether surface roughness, contact angle, or other factors most strongly correlate with lubricity. No prior work had combined tensile, contact angle, and atomic force microscopy data in this context. This study introduces a novel approach by integrating multiple analytical techniques to assess catheter performance. The findings may refine design criteria for urethral catheters. The research contributes to the broader field of medical device optimization.
Purpose Of The Study:
The primary aim was to determine how catheter surface properties influence lubricity during removal from a biological medium. The study focused on 12 different catheter types, including commercial and developmental materials. The goal was to quantify the work required for removal and correlate it with surface roughness and wettability. The motivation stemmed from clinical observations of variable catheter performance. The researchers sought to identify which properties most strongly affect lubricity. This could inform material selection and design improvements. The study also aimed to establish a predictive model for catheter removal ease. By combining tensile, contact angle, and surface analysis, the authors hoped to provide actionable insights for medical device development.
Main Methods:
The study used tensile analysis to measure the work required to remove catheter sections from a 1% agar model. Surface roughness was assessed using atomic force microscopy. Water wettability was evaluated via dynamic contact angle analysis. The advancing and receding contact angles were measured to assess surface hydrophobicity. Multiple regression and correlation analysis were applied to identify relationships between surface properties and lubricity. The agar model simulated biological tissue resistance during catheter removal. The catheters tested included silicone-based and other commercial materials. The study combined mechanical, optical, and statistical methods to evaluate performance.
Main Results:
Silicone-based catheters showed the highest ease of removal in the agar model. Surface roughness significantly correlated with lubricity, with smoother surfaces performing better. The regression model defined work done as 17.18 + 0.055 Rugosity – 0.52 Receding contact angle (r=0.49). Surface roughness had a strong positive correlation (r=0.48, p=0.0005) with lubricity. Receding contact angle showed a weak and non-significant relationship (r=-0.18, p>0.05). Advancing and receding contact angles varied based on catheter material. No clear link was found between surface roughness and biomaterial chemistry. The study demonstrated that surface roughness is a key factor in catheter lubricity.
Conclusions:
The study uniquely defined how surface roughness and wettability affect catheter lubricity. Surface roughness was found to have a significant impact on ease of removal. Receding contact angle showed no strong correlation with lubricity. The regression model provided a predictive framework for catheter performance. The findings suggest that biomaterial surface roughness should be prioritized in catheter design. No prior work had established this relationship with such precision. The agar model effectively simulated clinical conditions. The authors recommend further testing of the model in real-world settings.
Frequently Asked Questions
Surface roughness had the strongest correlation with lubricity (r=0.48, p=0.0005), while receding contact angle showed no significant relationship.
Lubricity was measured as the work required to remove catheter sections from a 1% agar model using tensile analysis.
Atomic force microscopy quantified surface roughness, which the study found to be a key determinant of catheter lubricity.
Dynamic contact angle analysis assessed wettability, revealing variations in hydrophobicity across catheter materials.
Work done (N mm) = 17.18 + 0.055 Rugosity (nm) – 0.52 Receding contact angle (degrees), with r=0.49.
The authors suggest that catheter design should prioritize surface roughness to ensure maximal ease of removal in clinical settings.