TissueDB/Materials/Gelatin
License: CC-BY-SA-3.0 by Danielle dk
Gelatin is a protein derived from collagen, used in surgical simulation to create tissue phantoms with tunable mechanical properties. Ballistic gelatin formulations provide realistic tissue drag during needle insertion and cutting, while softer preparations simulate organ parenchyma for ultrasound phantoms. Animal-derived but widely available and cost-effective for high-volume training programs.
Tissues
| Tissue | Visual | Tactile | Simulator | Notes |
|---|---|---|---|---|
| Soft Tissue | Pediatric Forearm Fracture Simulator | Mix 80 g unflavoured gelatin in 400 mL room-temperature water, add 400 mL heated water; refrigerate ~4 hours to set. Transparent when left uncoloured; add food colouring for an opaque set. | ||
| Muscle | Z-Plasty Simulator | Gelatin:glycerine:water ratio 8:8:2 with red food colouring and wool substrate. Microwave 30 seconds, baste until jam consistency. | ||
| Subcutaneous fat | Z-Plasty Simulator | Gelatin:glycerine:water ratio 2:6:12 with yellow food colouring and wool substrate. Set time 1 hour. Layer multiple pieces for thickness, glue with connective tissue paste. | ||
| Connective Tissue | Z-Plasty Simulator | Gelatin:glycerine:water ratio 5:2:10, no colouring, no substrate. Adhesive paste between tissue layers. | ||
| Skin | Z-Plasty Simulator | Gelatin:glycerine:water ratio 10:4:20 with food colouring for skin tone and 15-denier stocking substrate. Set time 1 hour. | ||
| Esophagus | Partial | Neonatal ETT Ultrasound Simulator (Qaim Ali) | Blended with psyllium fibre and cored with a hollow lumen to form a neck-ultrasound phantom.[1] | |
| Kidney | Partial | No | Ewald Percutaneous Renal Access Trainer | 10% ballistic gelatin + 30% iohexol (Omnipaque 300) + 60% water by weight; the added contrast makes the set gelatin radio-opaque for fluoroscopic needle targeting.[2] |
| Common Femoral Artery (femoral access mold) | Partial | Pulsatile REBOA Simulator (Keller) | Ultrasound-compatible gelatin mold capable of transducing discernible pulsations. Used for full percutaneous femoral access practice (needle puncture, Seldinger conversion, sheath upsize, balloon deployment); reusable up to four deployments before replacement. Source verbatim: "An ultrasound compatible gelatin mold capable of transducing discernible pulsations enables REBOA deployment starting with percutaneous vascular access and ending with balloon inflation".[3] | |
| Blood Vessel (PDA and aorta) | Patent Ductus Arteriosus Ligation Simulator | 15 g gelatin combined with 40 g glycerol and 0.5 g powdered red pigment, made up to 100 mL with cold water; left to stand 20 minutes, then stirred over low heat for about 10 minutes without boiling. Cast as gelatin-glycerol gel in a mould with plastic inserts that form the PDA and aorta lumen for dissection and double-ligation practice.[4] | ||
| Pleura (parietal) | Patent Ductus Arteriosus Ligation Simulator | Cast from the same gelatin-glycerol mixture as the vessel; the trainee dissects the parietal pleura off the aorta to expose the PDA.[4] |
References
[edit source]- ↑ Merali HS, Tessaro MO, Ali KQ, Morris SK, Soofi SB, Ariff S (2019). "A novel training simulator for portable ultrasound identification of incorrect newborn endotracheal tube placement – observational diagnostic accuracy study protocol." BMC Pediatrics 19:434. DOI: 10.1186/s12887-019-1717-y. PMID: 31722685. PMC: PMC6852924.
- ↑ Ewald JM, Cheng JW, Engelhart SM, Wilkinson MC, Hajiha M, Wagner H, Baldwin DD. A realistic, durable, and low-cost training model for percutaneous renal access using ballistic gelatin. Turk J Urol 2019;45(1):31–6. DOI: 10.5152/tud.2018.43569. PMID: 30668307.
- ↑ Keller BA, Salcedo ES, Williams TK, Neff LP, Carden AJ, Li Y, Gotlib O, Tran NK, Galante JM. Design of a cost-effective, hemodynamically adjustable model for resuscitative endovascular balloon occlusion of the aorta (REBOA) simulation. J Trauma Acute Care Surg. 2016 Sep;81(3):606–611. DOI: 10.1097/TA.0000000000001153. PMID: 27270855.
- ↑ 4.0 4.1 Cardiac Surgical Skills Training Module, SELF-Training team / Global Surgical Training Challenge, Appropedia, 2021. Build and operation: Phase 2 (Simulator Setup).
Overview
[edit source]Gelatin is an animal-derived protein obtained by hydrolysis of collagen from skin, bones, and connective tissue (typically bovine or porcine). Supplied as powder, sheets, or granules. Dissolves in warm water and sets into a gel upon cooling. Gel firmness adjustable by concentration. Requires refrigeration to maintain gel state. Widely available from grocery stores and specialty suppliers. It sits within the castable materials group, the materials a builder forms on site rather than buys in a finished shape.
Synonyms
[edit source]Common names: Gelatin, gelatine, Knox gelatin, ballistic gelatin, food-grade gelatin, pharmaceutical gelatin, unflavored gelatin
Regional terms: Gélatine (French), Gelatina (Italian/Spanish), Gelatine (German/Dutch)
Forms: Gelatin powder, gelatin sheets, gelatin blocks, ballistic gelatin, gelatin mix, set gelatin
Medical: Pharmaceutical-grade gelatin, absorbable gelatin sponge (Gelfoam)
Shelf Life & Storage
| Temp Range | Humidity | Surface Reuse | Shelf Life | Spoilage |
|---|---|---|---|---|
| Refrigeration required for set gel; room temperature for dry powder | Dry (<60%) for powder | Limited reuse (remeltable) | Powder: long-term if kept dry. Gel: days (refrigerated) | Mold growth; bacterial contamination if unrefrigerated |