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Non-Linear Sliding Contact Analysis Of Surgical Clamp
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KPG is a Biomedical Design Engineer, Computational and Experimental Mechanics Specialist, Engineering Failure Analysis with world-class expertise in engineering design and analysis services in biomedical device design, product design, analysis, test protocols, design verification tests and product documentation for FDA IDE submission of novel biomedical devices. Finite element and computational fluid dynamics analyst for design and analysis of various products requiring non-linear materials.
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Summary:
Bio-medical client has developed several conceptual designs for a clamp used to attach a signal device to an artery. The surgically installed clamp must be readily installed, provide excellent contact, and, if necessary, be easily removed and relocated. One of the proposed clamp designs and the analysis technique used to evaluate the clamp characteristic performance is illustrated in this article.
Problems:
The design concept presents a number of challenges, as does the analysis techniques necessary to evaluate the concept's performance:
- High volume, low cost design requires use of injection moldable materials
- Implantable device requires use of bio-compatible materials
- Design must provide repeatable, predictable clamping force
- Contact surfaces must provide dependable surface contact pressure
- Installation and removal forces must meet specified design criteria
Additional factors required the analysis to be capable of:
- replicating highly non-linear material characteristics
- large displacements
- 3-dimensional, sliding contact
Solution:
The analysis required software capabilities including use of non-linear material properties, large displacements, 3-dimensional sliding contact, rigid surfaces, and incrementally variable forces and displacements. MSC-MARC/MENTAT was selected based on its solution capabilities in these areas.
The proposed clamp design evaluated is illustrated in Figure #1. Note that the injection molded clamp is assumed to be in its installed position, clamped to a rigid surface representing the artery. The clamp consists of two injection molded "fingers" placed helically around the simulated arterial wall.
The primary objective of this study case was the evaluation of the resistance forces generated as the clamp is pulled away from the artery surface. Incremental displacements are applied, moving the clamp away from the surface simulating the artery wall.
The original geometry configuration for the analysis is shown in Figure No.1 Note that the "fingers" of the clamp are tightly clamped onto the artery surface. Although it was not included in this particular analysis sequence, pre-loading of the clamp is also possible in this analysis model.
As the clamp is pulled away from the surface of the simulated artery, we observe the sliding of the "fingers" around the perimeter of the artery surface - see Figure #2. Stress contours are observed at the root of the finger body.
Figure #3 illustrates additional displacement, which causes the one "finger" to slip off the artery surface, while the other maintains contact.
Figure #4 illustrates the displacement mode at the point where complete separation of the clamp from the artery is about to occur.
Analysis results available from the analysis included, but are not limited to:
- contact forces vs. displacement
- stress levels vs. displacement
- contact stresses vs. displacement
- strain vs. displacement
Figure #1
Figure #2
Figure #3
Figure #4
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| Biomedical Design Engineer, Computational and Experimental Mechanics Specialist, Engineering Failure Analysis, engineering design and analysis services in biomedical device design, product design, analysis, test protocols, design verification tests and product documentation for FDA IDE submission of novel biomedical devices. Finite element and computational fluid dynamics analyst for design and analysis of various products requiring non-linear materials. | |
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Rapid Response Engineering® Solutions
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