Blunt Needle Inoculation
Blunt Needle Inoculation - Related Videos
06:09
Intratracheal Inoculation of Fischer 344 Rats with Francisella tularensis
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Cited by 2 •
2017
This protocol describes intratracheal inoculations of Fischer 344 rats with Francisella tularensis. This procedure mimics pulmonary exposure of humans to this potential biothreat agent and can be used to test vaccine and therapeutic efficacy against pulmonary tularemia.
03:07
Development of a Rat Lung Infection Model Using Intratracheal Bacterial Inoculation
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2026
Source: Nguyen, J. Q., et. al. Intratracheal Inoculation of Fischer 344 Rats with Francisella tularensis. J. Vis. Exp. (2017)This video demonstrates the procedure of intratracheal inoculation in an anesthetized rat, involving catheter placement, bacterial delivery into the trachea, and subsequent lung infection establishment for studying host-pathogen interactions.
09:51
Intraosseous Needle Placement
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2023
Source: Julianna Jung, MD, FACEP, Associate Professor of Emergency Medicine, The Johns Hopkins University School of Medicine, Maryland, USA For unstable patients requiring urgent administration of medications, fluids, or blood products, establishing vascular access quickly is essential. However, there are many factors that can complicate placement of a peripheral intravenous cannula (PIV), and it is extremely common for PIV attempts to fail. PIV placement may be technically challenging in small...
10:06
Personalized Needles for Microinjections in the Rodent Brain
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Cited by 3 •
2018
We describe here a protocol for microinjection in the rodent brain that uses quartz needles. These needles do not produce detectable tissue damage and ensure reliable delivery even in deep regions. Moreover, they can be adapted to research needs by personalized designs and can be re-used.
08:25
Needle Thoracostomy
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2015
Source: Rachel Liu, BAO, MBBCh, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA A tension pneumothorax is a life-threatening situation in which excess air is introduced into the pleural space surrounding the lung, either through trauma to the chest cavity or as a spontaneous leak of air from the lung itself. Air trapped within the pleural space causes separation of the lung from the chest wall, disrupting normal breathing mechanisms. Pneumothorax may be small without...
FAQs
The rounded, non-cutting tip allows the sample to be introduced through controlled pressure and placement rather than by cutting into tissue. This design can minimize tissue laceration compared with a sharp needle, helping researchers create more consistent exposure conditions. The resulting observations can therefore be interpreted with greater attention to the biological agent rather than variation caused by delivery-related tissue injury.
Inoculum volume and concentration determine how much biological material reaches the target site and under what exposure conditions. Keeping both variables consistent helps distinguish biological differences between experimental groups from differences in sample delivery. Standardization is particularly important when researchers compare host responses, establish experimental infections, or evaluate treatment effects across repeated experiments.
The principal distinction is the needle tip and its effect on tissue during placement. A blunt needle has a rounded, non-cutting end, whereas a sharp needle is associated with a cutting tip. Because the blunt approach minimizes tissue laceration compared with a sharp needle, it can support more consistent exposure conditions when controlled pressure, placement, and inoculum parameters are maintained.
Reproducibility depends on controlling several linked factors: the inoculum volume, its concentration, the delivery site, and the handling technique. Consistency in these parameters reduces variation among experimental exposures. Standardization does not replace careful biological interpretation, but it helps researchers relate differences in observed outcomes more directly to the biological agent under investigation.
A controlled workflow begins with a defined biological sample, followed by consistent preparation of its volume and concentration. Researchers then use the rounded needle to deliver the sample through controlled pressure and placement at the selected target site. Recording and maintaining the same handling technique across samples supports comparable exposure conditions and improves the reproducibility of the experiment.
This approach is used when investigators need controlled experimental exposure to study biological effects. In medicine and biomedical research, applications include establishing experimental infections, assessing host responses, and evaluating treatments. Its value comes from combining a defined sample with standardized delivery conditions, allowing researchers to compare outcomes while limiting variation associated with tissue laceration and inconsistent placement.
Following delivery, researchers can examine whether an experimental infection is established, how the host responds, or how a treatment performs under controlled conditions. Interpretation depends on maintaining consistent inoculum characteristics and placement across experiments. When those conditions are standardized, observed differences can be related more confidently to the biological agent or treatment rather than inconsistent exposure.