Nasel Supplies That Contain Shellfish

Nasel Product
Chitosan Gel Technology Reduces Sinus Surgery Complications
The NovaShield Injectable Nasal Packing and Stent is made from chitosan, a polysaccharide derived from the shells of crustaceans, and is available in the form of an injectable, ready-to-use gel that is placed in the sinus or nasal cavities following FESS via an accordion cannula and flexible tip.

Nasel Packing Equipment
Bioresorbable and Biofragmentable Nasal Packing
Chitosan-Based Nasal Packing NovaShield™ nasal packing is made from chitosan, a polymer chemical produced from chitin, a component of the hard external shell of shellfish (e.g., crab, lobster, and shrimp). Chitosan's hemostatic properties have been extensively studied.

Nasel Spray
Shrimp to be Used to battle Hay Fever (article)
The treatment comes in the form of a nasal spray and changes the way the immune system responds to allergic triggers.

Shrimp shells contain a carbohydrate called chitin...which has been manufactured into in a nasal spray.

See Also:
Nasel Products That Contain Sesame Oil
Nasel Products Containing Nut Oils
Shrimp in First Aid Supplies

From Avoiding Milk Protein.com
Non Food Items That Contain Fish/ Shellfish
Medical Supplies Made From Ocean Life Opinions:
NOTE MOST EXPERTS FEEL THESE PRODUCTS ARE SAFE FOR THE SHELLFISH ALLERGIC

My opinion is although many experts feel these products are safe, I believe in caution, when using any of these products, by anyone who is shellfish allergic.