DEVELOPMENT OF CONCEPTS FOR PRIMARY HEART VALVE REPLACEMENT
Bibliographic record
Abstract
Highlights Average cycle stress for the developed concepts was 413.6–528.0 MPa. Hydrodynamic tests were successful – effective orifice area was 3.41 ± 0.08 and 3.52 ± 0.07 cm 2 . Two frame concepts were unsuitable, and the third requires geometric optimization. Aim. To develop and analyze concepts of support frames for transcatheter aortic valves based on numerical modeling methods in order to evaluate their mechanical characteristics, strength properties and hydrodynamic efficiency. Methods. The study used three-dimensional models of the support frames created using SolidWorks software (Dassault Systemes, France). The mechanical characteristics were assessed in the Abaqus/CAE environment (Dassault Systèmes, France) using the finite element method. The study included an analysis of the stress-strain state, fatigue strength, and radial forces arising during crimping and implantation of the prosthesis. The hydrodynamic characteristics were assessed using the Pulse Duplicator II stand (Vivitro Labs, Canada), which simulates the operating conditions of the prosthesis in the left ventricle of the heart. Results. Numerical modeling analysis showed that two of the three concepts studied demonstrated exceedance of the material strength limit, which makes them unsuitable for further use. One of the concepts demonstrated lower stress levels, but some areas of the design require further refinement. Radial stability tests revealed a predictable pattern of material deformation, which confirms the stability of the design under physiological conditions. Hydrodynamic tests showed compliance of the valve operation with established standards, the absence of critical turbulence zones and acceptable regurgitation levels. Conclusion. The obtained results indicate the need for further optimization of the geometry of the supporting frame of the developed device to reduce local stresses, as well as improvement of the surface finishing technology to improve the roughness index. The manufactured prototypes of the prosthesis have satisfactory hydrodynamic characteristics.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".