Needle Injection Technique
Needle Injection Technique - Related Videos
07:34
Minimally-invasive Technique for Injection into Rat Optic Nerve
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Cited by 4 •
2015
Direct injection into the rat optic nerve is useful for regenerative research. We demonstrate a minimally-invasive technique for direct injection into a rat optic nerve that does not involve opening the skull. Using this method, surgical complications are minimized and recovery is more rapid.
03:15
A Hypertonic Saline Injection Technique for Inducing Glaucoma in Rats
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2025
This video demonstrates glaucoma induction in an anesthetized rat by injecting hypertonic saline into the episcleral vein. The saline enters the trabecular meshwork via Schlemm's canal, causing tissue scarring, which blocks aqueous humor outflow and raises intraocular pressure. The elevated pressure damages retinal ganglion cells, leading to glaucoma.
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...
07:54
Applying Stereotactic Injection Technique to Study Genetic Effects on Animal Behaviors
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Cited by 15 •
2015
Stereotactic injection of lentiviruses expressing cDNAs or shRNAs can modulate gene expression in specific brain areas of mice. Here, we present a protocol to combine stereotactic injections with behavioral tasks, such as the Open Field Test (OFT) and the Forced Swim Test (FST).
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.
FAQs
Route determines which body compartment receives the substance, such as dermal, subcutaneous, muscular, or vascular tissue. Because these compartments differ in tissue properties and local blood flow, they can influence how quickly and effectively medication or another injected material distributes and is absorbed. Selecting the intended route therefore supports the expected therapeutic or diagnostic result.
Angle and depth guide the needle toward the intended tissue compartment. If placement does not match the selected route, the material may enter an unintended space, which can alter distribution, reduce effectiveness, or increase tissue injury and dosing errors. Route-specific positioning links the physical insertion process with the clinical purpose of the injection.
Tissue properties and local blood flow are central influences after delivery. They affect how an injected medication, vaccine, fluid, or diagnostic substance moves away from the placement site and becomes available within the body. Considering these factors helps clinicians select an appropriate compartment and supports more predictable therapeutic effectiveness while limiting unnecessary local tissue stress.
The principal difference is the intended destination within the body and the route-specific insertion requirements used to reach it. Dermal, subcutaneous, muscular, and vascular spaces have different tissue environments, so the clinician adjusts needle positioning, including angle and depth, to match the selected compartment. That distinction affects distribution, absorption, and the procedure’s clinical purpose.
A general workflow includes preparing the skin, selecting an appropriate needle, identifying the intended site and route, and inserting the needle to the route-specific angle and depth. The clinician then delivers the material in a controlled manner. These linked steps help place the substance accurately and reduce pain, tissue injury, infection, and dosing errors.
Site selection helps direct the needle toward the intended body compartment, while sterile handling reduces the risk of introducing infection during the procedure. Together with controlled delivery, these practices support accurate placement and safer administration. They are especially important when injections provide medications, vaccines, fluids, anesthesia, emergency treatment, or diagnostic substances.
Medical teams apply injection procedures across several settings, including vaccination, anesthesia, diabetes care, emergency treatment, and diagnostic procedures. The injected material and intended body compartment vary with the clinical goal. Across these applications, accurate site selection, appropriate needle choice, sterile handling, and controlled delivery help improve effectiveness while reducing avoidable procedural complications.