TissueDB/Materials/EVA Foam
CC BY-SA 4.0 via Wikimedia Commons
Ethylene-vinyl acetate (EVA) foam is a closed-cell synthetic foam used in medical simulation to replicate skin and subcutaneous tissue with fascial resistance characteristics. It is readily available, extremely affordable, and suitable for training in trocar insertion and incision techniques.
Tissues
| Tissue | Visual | Tactile | Simulator | Notes | |
|---|---|---|---|---|---|
| Skin and subcutaneous fat | Yes | Yes | ALL-SAFE Trocar, CrashSavers Pressure | Stack 2–3 sheets of 2 mm EVA foam; layer beneath thin silicone sheets for enhanced colour realism. Stacked foam approximates resistive properties of skin plus subcutaneous fascia. | |
| Fascial layers | Yes | Yes | ALL-SAFE Trocar | Three layers of 2 mm EVA (6 mm total) approximate abdominal wall fascia. Multiple EVA layers create resistance gradient (3–8 N) similar to abdominal fascia; teaches appropriate dissection depth. | |
| Skin and Subcutaneous Tissue | Partial | No | Fernandes Intra-abdominal Bleeding Simulator | EVA plate (72 × 54 cm) with thin sponge layer; provides incision surface for laparotomy access (Fernandes et al. 2023).[1] | |
| Common Femoral Artery (femoral access mold, foam variant) | Partial | Partial | Pulsatile REBOA Simulator (Keller) | Foam mold with 12 Fr Cook Medical sheath pre-placed; unlimited reuse per session. Used for deployment-only practice (skip the access step; focus on catheter manipulation and balloon inflation). Builder caveat: the source paper says "foam mold" without specifying foam type. Builders may substitute any closed-cell foam capable of holding a 12 Fr sheath in place; EVA Foam is one accessible substitute, not a Keller specification.[2] | |
| Skin | - | - | - | Synthetic Tourniquet Training Model (Souza Lima) | |
| Skin and Subcutaneous Tissue | - | - | - | Intra-abdominal Bleeding Simulator (Fernandes) |
Troubleshooting
- Hemostasis training — EVA foam does not simulate vascular response or bleeding. Trainees cannot develop blood loss recognition skills.
- Thermal injury training — EVA foam melts under heat; do not use for electrosurgical training. Fire hazard; unrealistic tissue response.
- Suturing and knot-tying — EVA foam does not simulate tissue grip or needle resistance. Trainees develop incorrect suture tension calibration.
- Deep dissection and layer-specific anatomy — Does not differentiate muscle, peritoneum, or viscera. No layer recognition training.
Alternatives
| Alternative | Best For | Trade-offs |
|---|---|---|
| Silicone | Suturable, realistic texture | Higher cost; requires molding |
| Felt | Fascial "pop" sensation | Different tactile properties |
| Gelatin Mix | Cutting fidelity, bleeding simulation | Requires refrigeration; limited shelf life |
Used In Simulators
| Simulator | Purpose | Notes |
|---|---|---|
| Fernandes Intra-abdominal Bleeding Simulator | Tissue-simulating material | EVA foam plate (72 × 54 cm) combined with thin sponge layer to simulate skin and subcutaneous tissue for laparotomy access (Fernandes et al. 2023).[1] |
References
[edit source]- ↑ 1.0 1.1 Fernandes CO, Rodrigues LR, Silva do Amaral MLBS, de Morais Rodrigues SJ, Marton-Filho MA. Low-cost simulator for intra-abdominal bleeding. Rev Col Bras Cir 2023;50:e20233512. DOI: 10.1590/0100-6991e-20233512-en. PMID: 37971114. PMC: PMC10618030.
- ↑ 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.
Overview
[edit source]EVA foam provides consistent, reproducible resistance for trocar insertion and basic incision training. Its low cost and global availability make it suitable for high-volume training in resource-limited settings. Available in 2 mm, 3 mm, and 5 mm sheets; stackable for graduated resistance. Cost: approximately USD 0.80–1.50 per sheet in multi-packs (Amazon/Michaels, April 2026). Indefinite shelf life at room temperature.
Synonyms
[edit source]Common names: Craft foam, Fun foam, Foamies, Foam sheet, EVA sheet, Closed-cell foam, Foam pad
Forms/Thicknesses: 2 mm foam, 3 mm foam, 5 mm foam, EVA foam roll, Foam strips, Foam blocks, Foam sheets
Material names: Ethylene-vinyl acetate foam, Ethylene vinyl acetate, EVA plastic foam, Synthetic foam, Closed-cell foam
Regional terms: Goma EVA (Spanish/Latin America), Moosgummi (German), Mousse EVA (French), Schiuma EVA (Italian)
Craft/Trade names: Craft foam, Craft supplier foam, Dollar store foam, Foam padding
Color variations: White foam, Colored foam, Assorted foam, White EVA sheet
Related terms: Foam layer, Synthetic skin, Resistive foam, Training foam, Tissue substitute
Abbreviations: EVA, EVA sheet, EVA pad
Shelf Life & Storage
| Temp Range | Humidity | Surface Reuse | Shelf Life | Spoilage |
|---|---|---|---|---|
| Ambient (15–25 °C) | Dry (<60%) | 50–100 sessions | Indefinite | None |
Clinical Context for Simulation
[edit source]EVA foam provides consistent, reproducible resistance for trocar insertion and basic incision training at very low cost. Stacking multiple foam sheets creates resistance gradients that approximate abdominal wall compliance. The "pop" sensation at fascial layer transitions supports tactile landmark recognition for safe pneumoperitoneum access.
Training applications include trocar insertion (angle and penetrating force), incision technique (scalpel control), fascial layer dissection (resistance gradient recognition), and force calibration for safe abdominal access.
Processing & Preparation
[edit source]Use 2 mm EVA foam sheets from craft suppliers. Verify closed-cell construction for consistent resistance. White or natural colour recommended.
Cut foam sheets to trainer dimensions using a sharp utility knife or scissors. For skin simulation, stack 2–3 sheets of 2 mm foam. For fascial simulation, stack 3 sheets of 2 mm foam (6 mm total). Layer sheets using spray adhesive or a stacking arrangement without adhesive.
Store in a dry environment at room temperature. No refrigeration required. Protect from direct sunlight to prevent discolouration. Rotate sheets regularly to distribute wear. Clean with water and mild detergent after use; allow to air-dry completely.
Safety Considerations
[edit source]- Fire hazard — Do not use in electrosurgical training; EVA foam melts and releases toxic fumes at high temperatures. Use silicone sheets for cautery practice.
- Marker transfer — Use permanent alcohol-based markers to prevent ink transfer to gloves or instruments.
- Dust generation — When cutting, use safety glasses and work in a ventilated area.
- Non-toxic — Closed-cell EVA foam is non-toxic and safe for medical simulation use.
- Standard disposal — Discard worn foam per institutional policy.
Related Materials
[edit source]- Silicone sheets — Higher fidelity; suturable surface but higher cost
- Felt — Alternative fascial layer simulation with different tactile properties
- Gelatin Mix — Cutting practice with bleeding simulation capability
| Authors | Arturopelayo |
|---|---|
| License | CC-BY-SA-4.0 |
| Cite as | Arturopelayo (2026). "TissueDB/Materials/EVA Foam". Appropedia. Retrieved June 4, 2026. |