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A 2018 laboratory study reported that a prototype dialyzer with bendable nanowires captured 97% of bacteria from bacteria-spiked human blood flowing through it at 10 cm/s. The “flytrap” is an analogy: nanowire tips bent around bacteria after molecular binding forces acted on them. The result is a proof of concept, not evidence of a proven or available sepsis treatment.
What the nanoclaw dialyzer is
The experimental device combined three-dimensional carbon foam with grafted nickel-cobalt oxide nanowires. In the bendable design, nanowire tips could flex after bacteria bound to Concanavalin A (Con A), a molecule placed on the wires. The resulting three-dimensional structures helped hold bacteria against the force of flowing fluid. The researchers also examined a less specific electrostatic capture approach using polyethylenimine (PEI).
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The Venus-flytrap comparison describes this material interaction, not a tiny plant or an autonomous biological trap. The wires start straight; binding forces associated with captured bacteria cause them to bend into nanoclaws. Nature Communications’ 2018 study describes the device and its experiments.
How the experimental designs compared
In bacteria-spiked adult human blood flowing at 10 cm/s, the study reported these capture efficiencies:
#1 Best Overall
| Experimental substrate | Bacterial capture at 10 cm/s |
|---|---|
| Smooth carbon foam | Approximately 10% |
| Single-crystalline nanowires on carbon foam | Approximately 40% |
| Bendable polycrystalline nanowires on carbon foam | 97% |
These percentages describe capture during the reported experimental pass through a homemade dialyzer. They are not patient outcomes, a sepsis cure rate, or evidence that the device improves survival.
How well captured bacteria stayed in place
The researchers also washed the experimental devices with sterile normal saline flowing at 20 cm/s for two minutes. The bendable polycrystalline nanowire design retained 85% of bacteria, compared with 35% for the single-crystalline nanowire design and 5% for smooth carbon foam. Retention after this laboratory wash is a separate measure from capture efficiency and does not establish performance in a patient.
What the study does—and does not—establish
The authors reported little nonspecific adsorption of red blood cells, white blood cells, and platelets in their experiments. That observation is not a demonstration of safety during patient treatment. The study presents an experimental system and discusses clinical implementation as a future-development consideration; it does not establish clinical effectiveness or availability.
A different nanotechnology approach reported in 2018
A separate project reported by UC San Diego used ultrasound-powered gold nanowires coated with platelet and red-blood-cell membranes. In contaminated blood samples containing MRSA and its toxins, the university report said treated samples had three times less bacteria and toxins after five minutes than untreated samples. That work was also described as proof of concept, with live-animal testing identified as future work. It is a distinct approach, not the carbon-foam nanoclaw dialyzer. UC San Diego’s report summarizes that project.
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