Check out this patent for a surgical sponge with several special features, including turning a different colour when it comes into contact with blood. https://patents.google.com/patent/US4098728A/en
US4098728A - Medical surgical sponge and method of making same - Google Patents
A uniformly expandable hydrophilic sponge, adapted for medical usage, characterized by instantaneous wicking and a high liquid holding capacity comprising a reaction product of polyvinyl alcohol and formaldehyde. The wicking and liquid holding capacity is attained by controlling the time, temperatur... Read more
Check out this patent for a surgical sponge with several special features, including turning a different colour when it comes into contact with blood. https://patents.google.com/patent/US4098728A/en
US4098728A - Medical surgical sponge and method of making same - Google Patents
A uniformly expandable hydrophilic sponge, adapted for medical usage, characterized by instantaneous wicking and a high liquid holding capacity comprising a reaction product of polyvinyl alcohol and formaldehyde. The wicking and liquid holding capacity is attained by controlling the time, temperatur... Read more
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Check out this patent for a surgical sponge with several special features, including turning a different colour when it comes into contact with blood.
https://patents.google.com/patent/US4098728A/en
Check out this patent for a surgical sponge with several special features, including turning a different colour when it comes into contact with blood.
https://patents.google.com/patent/US4098728A/en