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Gas-jet propelled hemostats for targeted hemostasis in wounds with irregular shape and incompressibility.
Since hemostats are likely to be flushed off a wound by a massive gushing of blood, achieving rapid and effective hemostasis in complex bleeding wounds with powder hemostats continues to be a significant therapeutic challenge. In order to counter the flushing effect of gushing blood, a gas-jet propelled powder hemostat ((COL/PS)4 @CaCO3 -T-TXA+ ) has been developed. (COL/PS)4 @CaCO3 -T-TXA+ dives into the deep bleeding sites of complex wounds for targeted hemostasis. In preparation, protamine sulfate and collagen are first electrostatically deposited on CaCO3 , which is then loaded with thrombin, and finally doped with protonated tranexamic acid (TXA-NH3 + ) to produce the final therapeutic medicine (COL/PS)4 @CaCO3 -T-TXA+ . When applied to bleeding tissues, CaCO3 and TXA-NH3 + from (COL/PS)4 @CaCO3 -T-TXA+ immediately react with each other in blood to release countless CO2 macro-bubbles, which direct the hemostatic powder, (COL/PS)4 @CaCO3 -T-TXA+ , precisely towards deep bleeding sites from complex wounds. Then the carried thrombin is released to accomplish targeted hemostasis. According to animal studies, (COL/PS)4 @CaCO3 -T-TXA+ has better effects in rabbit hepatic hemorrhage models; the hemorrhage quickly stops within 30 s, which is roughly 20% less than with the commercial product CeloxTM . The present study provides a new strategy for using powder hemostats to quickly and effectively stop bleeding in complex bleeding wounds.
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