Silicone Appendectomy Model for Laparoscopic Training
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Solution Overview
Problem
Current surgical training tools lack realistic simulated tissue structures for practicing laparoscopic and endoscopic minimally invasive surgical procedures, which are essential for developing the necessary skills in visual determination, precision cutting, and instrument manipulation due to the indirect observation of target tissues during these procedures.
Innovation Solution
A simulated appendectomy model made of silicone and thermoplastic elastomer, integrated with anatomical landmarks and hidden from direct observation, is placed inside a laparoscopic trainer, allowing practitioners to practice laparoscopic surgical skills by viewing the operation on a video monitor, with features such as simulated arteries and a pocket-like structure to mimic the anatomy and procedure steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If realistic simulated tissue structures are used for surgical training, then training effectiveness and skill development are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The simulated tissue structure is divided into multiple distinct layers including subcutaneous tissue layer, muscle layer, fascial layer, and peritoneal layer, each with different material properties and colors. This segmentation allows trainees to practice identifying and accessing specific anatomical layers while maintaining overall structural realism, thereby improving training effectiveness without requiring the entire model to be excessively complex.
Solution Approach 2:
Different regions of the simulated tissue structure have locally optimized properties - the subcutaneous tissue layer uses a first material with specific elasticity, the muscle layer uses a second material with different mechanical properties, and each layer is colored differently. This local quality approach allows trainees to practice visual identification and tactile differentiation of tissue types in their specific anatomical contexts, enhancing training realism while keeping the overall design manageable.
2Manufacturing precision
If multiple tissue layers with different properties are simulated, then anatomical accuracy and training realism are improved, but manufacturing precision and cost increase
Solution Approach 1:
The model is constructed as a series of discrete layers that can be manufactured separately and then assembled. Each layer (subcutaneous tissue, muscle, fascia, peritoneum) can be produced using standardized molding techniques with its specific material and color properties, then stacked in the correct anatomical sequence. This segmentation enables high anatomical accuracy while maintaining reasonable manufacturing precision requirements for each individual layer.
Solution Approach 2:
The simulated tissue structure employs composite construction using multiple materials with different physical properties - elastomers for flexible layers, foams for cushioning layers, and different coloring agents for visual differentiation. This composite approach allows each layer to be manufactured with appropriate material characteristics while using established manufacturing techniques, balancing anatomical accuracy with ease of production.
Data Source
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AI summary
An appendectomy model for surgical training is provided. The model includes a simulated large intestine with a central lumen interconnected with a lumen of an artificial appendix. The model also includes a simulated appendiceal artery, simulated mesoappendix and a simulated ileum. The simulated ileum made of white silicone is embedded between a first layer of pink silicone and a second layer of pink silicone to create a realistic anatomical landmark particularly suitable for laparoscopic appendectomy training.