Novel Percutaneous Approach for Deployment of 3D Printed Coronary Stenosis Implants in Swine Models of Ischemic Heart Disease
February 18th, 2020
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We describe a novel, cost-effective, and efficient technique for percutaneous delivery of three-dimensionally printed coronary implants to create closed-chest swine models of ischemic heart disease. The implants were fixed in place using a mother-and-child extension catheter with high success rate.
Overview
This study presents a novel technique for the percutaneous delivery of three-dimensionally printed coronary implants in swine models of ischemic heart disease. The method utilizes a mother-and-child extension catheter, demonstrating a high success rate in implant deployment.
Key Study Components
Area of Science
- Cardiovascular research
- Biomedical engineering
- Translational medicine
Background
- Ischemic heart disease is a significant health concern.
- Existing models for studying this condition can be invasive and complex.
- Minimally invasive techniques can improve animal welfare and research efficiency.
- Three-dimensional printing offers new possibilities for custom implants.
Purpose of Study
- To develop a cost-effective method for coronary implant delivery.
- To enhance the safety and efficacy of swine models in ischemic heart disease research.
- To facilitate the development of new diagnostic imaging techniques.
Methods Used
- Use of a mother-and-child catheter for precise deployment.
- Creation of three-dimensionally printed coronary implants.
- Implementation of a closed-chest swine model.
- Assessment of angiogram quality post-implantation.
Main Results
- The technique allows for rapid and safe deployment of implants.
- High-quality angiograms were obtained using the mother-and-child catheter.
- The method shows potential for application in other vascular diseases.
- Adverse effects on animal subjects were minimized.
Conclusions
- This novel technique enhances the study of ischemic heart disease.
- It provides a framework for future research in vascular conditions.
- The method can be adapted for various diagnostic imaging advancements.
Frequently Asked Questions
What is the significance of this study?
This study introduces a novel method for delivering coronary implants in swine models, improving research efficiency and animal welfare.
How does the mother-and-child catheter work?
The catheter allows for precise and safe deployment of implants, facilitating high-quality angiograms.
What are the potential applications of this technique?
The method can be used for developing new diagnostic imaging techniques and may be applicable to other vascular diseases.
What are the advantages of using a closed-chest model?
Closed-chest models reduce invasiveness and stress on animal subjects, leading to more ethical research practices.
Can this method be adapted for other types of implants?
Yes, with slight modifications, the technique can be applied to various vascular conditions and implant types.
Executive Industry Relevance
This method enables rapid, reproducible creation of focal coronary stenosis models in swine, supporting preclinical evaluation of diagnostic imaging and therapeutic interventions for ischemic heart disease. By improving procedural efficiency and reducing animal stress, it enhances translational confidence in cardiovascular target validation and lead identification workflows. The approach addresses a key bottleneck in large-animal model development, facilitating higher-throughput screening of coronary artery disease mechanisms.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables precise induction of focal coronary lesions to interrogate therapeutic hypotheses in ischemic pathways.
- Operational Value: Reduces procedural failure rates, improving reproducibility of stenosis models across study cohorts.
Screening & Assay Development
- Scientific Value: Provides standardized, quantifiable coronary narrowing for consistent assessment of imaging biomarkers and drug effects.
- Operational Value: Supports same-day MRI and angiography readouts, accelerating assay turnaround in discovery pipelines.
Translational & Preclinical Research
- Scientific Value: Creates disease-relevant swine models that bridge discovery to preclinical validation of coronary interventions.
- Operational Value: Allows longitudinal imaging and functional assessment within a single session, reducing animal use and logistical complexity.
Pipeline & Workflow Integration
The technique fits within the cardiovascular discovery continuum, enabling lesion modeling prior to therapeutic screening and mechanistic follow-up in ischemic heart disease programs.
- Discovery Biology: Supports hypothesis testing by generating controlled coronary stenosis to evaluate pathway-specific responses.
- Screening: Delivers reproducible angiographic and perfusion endpoints for compound or device evaluation.
- Analytics: Generates quantitative MRI and angiographic outputs to compare ischemic burden across conditions.
- Translational Research: Connects acute stenosis modeling to preclinical assessment of perfusion-defect reversal or remodeling.
- Enterprise Reuse: Establishes a reusable platform for coronary model generation across multiple vascular disease projects.
Operational & Enterprise Impact
- Scientific Value: Improves predictive confidence in coronary lesion models through precise, repeatable implant deployment.
- Operational Value: Leverages existing mother-and-child catheter infrastructure, minimizing new equipment needs.
- Strategic Value: Reduces time and resource expenditure in model development, supporting faster go/no-go decisions.
- Portfolio Impact: Enables risk-adjusted prioritization of coronary-targeted candidates based on reliable ischemia induction.
Implementation Considerations
- Requires expertise in interventional cardiology and swine hemodynamics.
- Depends on fluoroscopy, MRI, and angiographic imaging systems.
- Necessitates standardized implant preparation (e.g., heparin coating) and catheter handling.
- Must account for vessel size limitations in smaller swine models.
- Involves procedural training to maintain stable mother-and-child catheter positioning during balloon deflation.
Biopharma FAQs
Why does precise implant deployment matter for target validation?
Accurate placement of 3D printed coronary implants ensures consistent stenosis location and severity, which is critical for reliable evaluation of therapeutic targets in ischemic pathways. This precision reduces variability in functional readouts across study groups, supporting reproducible target engagement assessments.
How does mother-and-child catheter use improve discovery pipeline efficiency?
The mother-and-child catheter stabilizes the implant during delivery, enabling percutaneous deployment without ancillary equipment and reducing procedural failure. This streamlines model generation, allowing teams to advance to imaging and intervention studies more quickly.
What quantitative measurements enable stenosis assessment in this model?
Coronary cineangiography visualizes the focal narrowing, while gadolinium-enhanced first-pass cardiac perfusion MRI quantifies inducible perfusion defects in the subtended myocardium. These outputs provide complementary anatomical and functional data for stenosis characterization.
Why are replication requirements important for cross-functional collaboration?
Achieving low procedural failure rates (as demonstrated in n=11 swine) ensures that stenosis models can be reliably reproduced across laboratories and study sites. This consistency supports aligned interpretation of imaging, histology, and functional data between discovery and translational teams.
What statistical analysis capabilities are needed before implementing this technique?
Teams should be able to analyze angiographic stenosis severity and perfusion defect volumes using standardized quantitative methods. Pre-implementation planning should include power calculations based on expected effect sizes in ischemia endpoints to ensure adequate group sizing.
