How to perform a puncture test using the Mach-1
Equipment:
- https://www.biomomentum.com/accessories/sample-holder-puncture-fixtures/
- https://www.biomomentum.com/accessories/kit-of-spherical-indenters/
- https://www.biomomentum.com/mechanical-testers/mach-1-v500c/
Here is a good starting point where we performed
the puncture of heart valve leaflets:
https://www.biomomentum.com/case-studies/validation-of-a-conditioning-and-rupture-test-method-for-pulmonary-valve-cusps/
Based on this article: https://www.sciencedirect.com/science/article/abs/pii/S1751616112001221?via%3Dihub
The programming looked something like this:
1. Approach indenter approximately 2mm above the aperture and execute the following sequence to find the surface of the sample:
|
Parameters |
|
|
Zero Load |
N/A |
|
Find Contact |
Stage Axis: Position (z) Load Cell Axis: Fz Direction: Positive Stage Velocity, mm/s: 0.100 Contact Criteria, gf: 10.00 Stage Limit, mm: 10 Stage Repositioning: None |
|
Zero Position |
N/A |
2. Execute the following sequence to perform the pre-conditioning cycles:
|
Functions |
Parameters |
|
Find Contact |
Stage Axis: Position (z) Load Cell Axis: Fz Direction: Positive Stage Velocity, mm/s: 0.417 (25 mm/min) Contact Criteria, gf: 500 Stage Limit, mm: 10 Stage Repositioning: None Save data as “___.txt” |
|
Move Absolute |
Amplitude, mm: 0.000 Velocity, mm/s: 0.417 Save data as “___.txt” |
|
Repetitions |
3 |
3. Wait 5 minutes for the tissue to return to its normal state (ensuring the tissue stays hydrated over this time).
4. Execute this final sequence to perforate the sample:
|
Functions |
Parameters |
|
Zero Load |
N/A |
|
Find Contact |
Stage Axis: Position (z) Load Cell Axis: Fz Direction: Positive Stage Velocity, mm/s: 0.100 Contact Criteria, gf: 10.00 Stage Limit, mm: 10 Stage Repositioning: None |
|
Move Relative |
Amplitude, mm: 8.000 Velocity, mm/s: 0.417 Save data as “___.txt” |
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