TissueDB/Materials/Konjac
CC BY-SA 3.0
Konjac (also known as konjac glucomannan, konnyaku) is a plant-based hydrocolloid derived from the root of the konjac plant (Amorphophallus konjac), supplied as a white powder. It forms an irreversible gel when heated with calcium hydroxide, with firmness adjustable by concentration (2–5%). The set gel is compatible with electrosurgical devices such as electrocautery and harmonic scalpels. It can be used in medical simulation to make tissue phantoms.
Tissues
| Tissue | Visual | Tactile | Simulator | Notes |
|---|---|---|---|---|
| Liver | Higher concentration (4%) increases firmness. | |||
| Bowel/intestine | Add glycerin to increase flexibility. | |||
| Skin | Cast as a sheet; fabric backing adds tear resistance. |
Troubleshooting
- Prolonged exposure — Konjac gels dehydrate at room temperature. Use within a single session; cover with damp cloth between uses.
- High-temperature sterilisation — Konjac degrades above 100 °C. For thermal training, use silicone.
- Long-term storage — Gel degradation produces inconsistent tactile feedback. Prepare fresh for each training session.
Alternatives
| Alternative | Best For | Trade-offs |
|---|---|---|
| Agar | Transparent phantoms, ultrasound models | Plant-based gel; more brittle than konjac |
| Gelatin | Higher tactile fidelity, established protocols | Animal-derived; requires refrigeration |
| Silicone | Permanent, reusable models | Higher cost; requires molds |
References
[edit source]
Overview
[edit source]Konjac is a plant-derived polysaccharide (glucomannan) extracted from the root of the konjac plant (Amorphophallus konjac). Supplied as a white powder; forms irreversible gel when heated with calcium hydroxide. Gel firmness adjustable by concentration (2–5%). Compatible with electrosurgical devices. Food-grade material sourced from specialty food suppliers.
Synonyms
[edit source]Common names: Konjac, konjac glucomannan, konnyaku
Source: Konjac plant root (Amorphophallus konjac)
Shelf Life & Storage
| Temp Range | Humidity | Surface Reuse | Shelf Life | Spoilage |
|---|---|---|---|---|
| Room temperature (set gel); cool dry storage (powder) | Dry (<60%) for powder | Single use (phantoms) | Powder: long-term if kept dry. Gel: single session use recommended. | Gel dehydration; surface cracking |
Clinical Context for Simulation
[edit source]Processing & Preparation
[edit source]Safety Considerations
[edit source]Related Materials
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| Authors | Arturopelayo |
|---|---|
| License | CC-BY-SA-4.0 |
| Cite as | Arturopelayo (2026). "TissueDB/Materials/Konjac". Appropedia. Retrieved June 4, 2026. |