TissueDB/Materials/Felt
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Felt is a dense, bonded fabric (wool or synthetic fibers) used to represent planar, load-bearing tissue layers requiring distinct puncture resistance and the characteristic fascial "pop" sensation critical for safe trocar insertion. Synthetic felt (acrylic or polyester) is preferred for consistency and cleaning ease.
Tissues
| Tissue | Visual | Tactile | Simulator | Notes |
|---|---|---|---|---|
| Skin | Orthoplastic Reconstruction Simulator | 45 cm × 10 cm felt piece. Punch 5 holes on each long side; secured to board with elastic bands. |
Troubleshooting
- High-volume repetitive use without rotation — Felt becomes matted with repeated needle passage; rotate piece or use fresh surface between learners.
- Lateral/sliding needle techniques — Surface tears with lateral movement; use perpendicular insertion technique only.
- Applications requiring low puncture resistance — Single layer insufficient; layer two or three pieces or pre-compress under weight for 24 hours if more resistance needed.
Alternatives
| Alternative | Best For | Trade-offs |
|---|---|---|
| EVA Foam | Multiple skin/fat layers | Less distinct "pop" |
| Silicone | Peritoneal layer | Higher cost |
References
[edit source]
Overview
[edit source]Felt provides consistent puncture resistance mimicking fascial "pop" sensation critical for safe trocar insertion. Dense fiber structure creates appropriate tissue resistance without sharp penetration characteristics. Available as synthetic felt (acrylic or polyester) in 2–3 mm thickness. Indefinite shelf life at room temperature. Extremely low cost enables widespread deployment in resource-constrained settings.
Synonyms
[edit source]Common names: Craft felt, Industrial felt, Wool felt, Synthetic felt, Acrylic felt
Related terms: Bonded fabric, Non-woven fabric, Compressed fiber sheet
Shelf Life & Storage
| Temp Range | Humidity | Surface Reuse | Shelf Life | Spoilage |
|---|---|---|---|---|
| Ambient (15–25 °C) | Dry environment | 10–20 sessions | Indefinite | None (stable fiber) |
Clinical Context for Simulation
[edit source]Processing & Preparation
[edit source]Material selection: Synthetic felt (acrylic or polyester) preferred over wool for consistency and ease of cleaning. Thickness 2–3 mm standard.
Sizing: Cut into 15×5 cm strips or adapt to specific simulator dimensions. Mark resistance baseline with permanent marker if testing load.
Layering: Single 2 mm layer provides baseline fascial resistance (~3–5 N). Layer two sheets for thicker fascia simulation (~6–8 N). Pre-compression under weight for 24 hours increases density and resistance.
Cleaning: Wipe with damp cloth; air dry between sessions. Felt retains marks and minor surface damage—normal wear pattern.
Rotation strategy: Rotate fresh surface for each learner to prevent matting and maintain consistent tactile feedback across training group.
Safety Considerations
[edit source]- Surface degradation — Repeated needle passage causes matting and fiber compression. Plan for material replacement after 10–20 training sessions per piece.
- Fiber shedding — Older felt may release fibers; inspect regularly and discard degraded material.
- Allergy considerations — Wool felt may trigger reactions in individuals with wool sensitivity; synthetic alternatives safer for mixed populations.
Related Materials
[edit source]- EVA Foam — Provides layered tissue simulation; less distinct pop
- Silicone — Higher cost; durable, reusable peritoneal simulation
- Packing Tape — Layered over felt to increase resistance