Assessment of Plasma Coagulation on Liver Tissue in a Large Animal Model In Vivo
August 4th, 2018
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Here we present a protocol to experimentally assess plasma coagulation in liver tissue in vivo. In a porcine model, microcirculation is examined by laser Doppler, coagulation depth is measured histologically, temperature at coagulation site by infrared thermometer and thermographic camera, and duct sealing effect is documented by burst pressure experiments.
Overview
This article presents a protocol for assessing plasma coagulation in liver tissue in vivo using a porcine model. Key measurements include microcirculation via laser Doppler, coagulation depth histologically, and temperature at the coagulation site using infrared thermography.
Key Study Components
Area of Science
- Clinical liver surgery
- Plasma coagulation
- Thermography applications
Background
- The study focuses on the energy setting depth relation of argon and helium plasma coagulation.
- Utilizes a large animal model that closely resembles clinical applications.
- Infrared thermography is employed for monitoring various physiological parameters.
- Inflammation processes can also be observed with this technique.
Purpose of Study
- To experimentally assess the effectiveness of plasma coagulation in liver tissue.
- To evaluate the relationship between energy settings and coagulation depth.
- To demonstrate the utility of infrared thermography in monitoring surgical procedures.
Methods Used
- Laser Doppler for assessing microcirculation.
- Histological measurement of coagulation depth.
- Infrared thermometer and thermographic camera for temperature monitoring.
- Burst pressure experiments to document duct sealing effects.
Main Results
- Successful assessment of plasma coagulation depth in liver tissue.
- Demonstrated the effectiveness of infrared thermography in monitoring temperature distribution.
- Established a correlation between energy settings and coagulation outcomes.
- Validated the use of a porcine model for clinical relevance.
Conclusions
- The protocol provides a reliable method for studying plasma coagulation in vivo.
- Infrared thermography proves to be a valuable tool in surgical monitoring.
- This study enhances understanding of coagulation processes in liver surgery.
Frequently Asked Questions
What is the significance of using a porcine model?
The porcine model closely mimics human physiology, making it relevant for clinical applications.
How does infrared thermography contribute to the study?
It allows for real-time monitoring of temperature distribution and other physiological parameters during the procedure.
What are the main advantages of this technique?
The technique is clinically relevant and does not require special equipment, making it accessible for various research settings.
What measurements are taken during the procedure?
Measurements include microcirculation, coagulation depth, and temperature at the coagulation site.
Who demonstrates the procedure?
Pascal Paschenda, a technician from the research group, demonstrates the procedure.
What is the purpose of burst pressure experiments?
Burst pressure experiments document the effectiveness of duct sealing achieved through plasma coagulation.
Executive Industry Relevance
This protocol enables preclinical evaluation of plasma coagulation effects in a clinically relevant large animal model, supporting target validation for hemostatic and biliostatic interventions. By quantifying microcirculation changes, coagulation depth, and thermal profiles, it provides mechanistic de-risking data for surgical device development. The approach bridges discovery-stage hypothesis testing with translational continuity in liver surgery innovation pipelines.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Interrogates therapeutic hypotheses regarding energy setting-depth relationships in plasma coagulation.
- Operational Value: Enables functional target validation through histological confirmation of necrosis zones.
- Predictive Value: Supports portfolio triage by correlating device output power with coagulation depth and hemostatic efficacy.
Screening & Assay Development
- Assay Readiness: Prepares validated biological systems for downstream evaluation of coagulation modalities.
- Quantitative Outputs: Delivers measurable microcirculation and burst pressure data for assay standardization.
- Platform Reuse: Enables scalable comparison of different hemostatic and biliostatic techniques in a surgical setting.
Translational & Preclinical Research
- Disease Relevance: Uses porcine liver tissue to model human postoperative hepatectomy scenarios.
- Translational Continuity: Connects discovery-phase coagulation profiling to preclinical validation of duct sealing effects.
- Risk-Adjusted Decisions: Informs advancement decisions by establishing power-setting-to-outcome relationships.
Pipeline & Workflow Integration
Positions plasma coagulation assessment within the discovery-to-preclinical continuum, enabling hypothesis-driven evaluation of energy-based surgical tools.
- Discovery Biology: Supports mechanistic interrogation of plasma-tissue interactions and pathway clarification of coagulation effects.
- Screening: Delivers reproducible, quantitative microcirculation and thermal readouts for compound or device comparison.
- Analytics: Provides histological depth measurements and burst pressure thresholds that enable cross-condition benchmarking.
- Translational Research: Connects ex vivo burst pressure data to in vivo coagulation profiling for preclinical continuity.
- Enterprise Reuse: Establishes a reusable platform for evaluating multiple coagulation modalities under standardized conditions.
Operational & Enterprise Impact
- Scientific Value: Reduces mechanistic ambiguity in plasma coagulation processes through multimodal monitoring.
- Operational Value: Standardizes coagulation zone assessment via titanium mold and probe distance controls.
- Strategic Value: Improves go/no-go decisions by linking energy settings to hemostatic and biliostatic outcomes.
- Portfolio Impact: Enables risk-adjusted prioritization of plasma coagulation parameters for surgical device optimization.
Implementation Considerations
- Requires expertise in large animal surgery, laser Doppler flowmetry, and histological sectioning.
- Needs infrared thermography, spectrophotometer, and plasma coagulation device with adjustable power settings.
- Demands cross-team standardization for microcirculation, temperature, and burst pressure measurement protocols.
- Involves adaptation considerations when translating findings from porcine to human liver tissue models.
- Limited to superficial coagulation effects; cannot assess sealing of larger blood vessels per source material.
Biopharma FAQs
Why does null hypothesis testing matter for target validation in plasma coagulation studies?
Null hypothesis testing determines whether observed changes in microcirculation or coagulation depth are statistically significant, supporting confident target validation decisions.
How does independent variable isolation fit the discovery pipeline for energy-based coagulation devices?
Isolating plasma device output power as the independent variable enables clear correlation with coagulation depth, supporting mechanistic de-risking in early discovery.
What quantitative dependent variable measurements enable preclinical assessment of plasma coagulation effects?
Measurements include laser Doppler-derived microcirculation flow, histological coagulation depth, and burst pressure values, providing quantifiable endpoints for preclinical evaluation.
Why do replication requirements matter for cross-functional collaboration in plasma coagulation protocol execution?
Replication ensures consistent microcirculation and thermal measurements across sites and sessions, enabling reliable data sharing between surgical, histology, and analytics teams.
What statistical analysis capabilities are required before implementing this plasma coagulation assessment protocol?
Capabilities to analyze microcirculation trends, depth-power correlations, and burst pressure distributions are needed to interpret coagulation efficacy and support go/no-go decisions.
