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Encyclopedia > Hypodermic needle
Different bevels on hypodermic needles.
Syringe on left, hypodermic needle with attached color-coded luer lock on right.
Syringe on left, hypodermic needle with attached color-coded luer lock on right.

A hypodermic needle is a hollow needle commonly used with a syringe to inject substances into the body. They may also be used to take liquid samples from the body, for example taking blood from a vein in venipuncture. Download high resolution version (1047x600, 85 KB)Different bevels on hypodermic needles File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Download high resolution version (1047x600, 85 KB)Different bevels on hypodermic needles File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Side views of a bevel (above) and a chamfer (below) A beveled edge refers to an edge of a structure that is not perpendicular (but instead usually at 45 degrees) to the faces of the piece. ... Download high resolution version (1044x180, 55 KB)Syringe on left, hypodermic needle with attached color-coded luer lock on right. ... Download high resolution version (1044x180, 55 KB)Syringe on left, hypodermic needle with attached color-coded luer lock on right. ... A syringe nowadays nearly always means a medical syringe, but it can mean any of these: A simple hand-powered piston pump consisting of a plunger that can be pulled and pushed along inside a cylindrical tube (the barrel), which has a small hole on one end, so it can... A color code is a system for displaying information by using different colors. ... Luer Taper is a standardized system of small-scale plumbing fittings used for making leak-proof connections between a male-taper fitting and its mating female part on medical and laboratory instruments, including hypodermic syringe tips and needles or stopcocks and needles. ... A syringe nowadays nearly always means a medical syringe, but it can mean any of these: A simple hand-powered piston pump consisting of a plunger that can be pulled and pushed along inside a cylindrical tube (the barrel), which has a small hole on one end, so it can... An injection is a method of putting liquid into the body with a hollow needle and a syringe which is pierced through the skin long enough for the material to be forced into the body. ... Venipuncture using a vacutainer. ...


A hypodermic needle is used for instant delivery of a drug, or when the injected substance cannot be ingested, either because it would not be absorbed (as with insulin), or because it would harm the liver (as with testosterone). There are many possible routes for an injection. is really just water but doctors get you to pay more Not to be confused with inulin. ... For the bird, see Liver bird. ... Testosterone is a steroid hormone from the androgen group. ... An injection is a method of putting liquid into the body with a hollow needle and a syringe which is pierced through the skin long enough for the material to be forced into the body. ...


Virtually all current hypodermic needles and their associated syringes are designed for single use because they are hard to decontaminate and need sharpening after repeat use. Re-using or sharing needles can transmit many blood-borne diseases including HIV and hepatitis C. Needles are normally used only once and disposed of in a sharps container. A syringe nowadays nearly always means a medical syringe, but it can mean any of these: A simple hand-powered piston pump consisting of a plunger that can be pulled and pushed along inside a cylindrical tube (the barrel), which has a small hole on one end, so it can... A blood-borne disease is one that can be spread by contamination by blood. ... Species Human immunodeficiency virus 1 Human immunodeficiency virus 2 Human immunodeficiency virus (HIV) is a retrovirus that causes acquired immunodeficiency syndrome (AIDS, a condition in humans in which the immune system begins to fail, leading to life-threatening opportunistic infections). ... This page is for the disease. ... Immediate disposal of used needles into a sharps container is standard procedure. ...


Single-use syringes, which have automatic mechanisms to prevent reuse, have been developed to stop the spread of disease in medical settings, examples of which include medical personnel exposure and immunizations [1] . One type is a pre-filled plastic blister with a hypodermic needle attached via a one-way valve. [2] Immunization (AmE) or Immunisation (BE) has a number of meanings: In medicine immunization is the process by which an individual is exposed to a material that is designed to prime his or her immune system against that material. ... // These water valves are operated by handles. ...


Hypodermic needles are normally made from a stainless steel tube drawn through progressively smaller dies to make the needle. The end is bevelled to create a sharp pointed tip. This lets the needle easily penetrate the skin. When a hypodermic needle is inserted, the bevel should be facing upwards.


The diameter of the needle is indicated by the needle gauge. Various needle lengths are available for any given gauge. There are a number of systems for gauging needles, including the Stubs Needle Gauge, and the French Catheter Scale. Needles in common medical use range from 7 gauge (the largest) to 33 (the smallest) on the Stubs scale. Twenty-one gauge needles are most commonly used for drawing blood for testing purposes, and sixteen or seventeen gauge needles are most commonly used for blood donation, as they are large enough to allow red blood cells to pass through the needle without rupturing (this also allows more blood to be collected in a shorter amount of time). Smaller gauge needles will rupture the red blood cells, and if this occurs, the blood is useless for the patient that is receiving it. Although reusable needles remain useful for some scientific applications, disposable needles are far more common in medicine. Disposable needles are embedded in a plastic or aluminium hub that attaches to the syringe barrel by means of a press-fit (Luer) or twist-on (Luer-lock) fitting. Look up Gauge in Wiktionary, the free dictionary. ... The Stubs Iron Wire Gauge system is used in medicine to measure the diameter of hypodermic needles, catheters, and suture wires. ... The French catheter scale is commonly used to measure the outside circumference of cylindrical medical instruments including catheters. ...

Contents

Phobia

It is estimated that about 10% of the adult population may have a phobia of needles (Trypanophobia), and it is much more common in children. For other uses, see Phobia (disambiguation). ... Trypanophobia is the extreme and irrational fear of medical procedures involving injections or hypodermic needles. ...


See also

A cannula (pl. ... Catheter disassembled In medicine, a catheter is a tube that can be inserted into a body cavity, duct or vessel. ... Intravenous therapy or IV therapy is the giving of liquid substances directly into a vein. ... Needle aspiration biopsy (NAB), also known as fine needle aspiration cytology (FNAC), fine needle aspiration biopsy (FNAB) and fine needle aspiration (FNA), is a procedure performed to diagnose certain kinds of medical conditions, such as lumps in the neck. ... Hypodermic needles are available in a wide variety of sizes described by gauge numbers. ... Needle removers are devices that physically remove a needle from a syringe. ... A Tuohy needle is a hollow needle, very slightly curved at the end, suitable for inserting epidural catheters. ...

References

Cecil Adams is the pen name of the author of The Straight Dope since 1973, a popular question and answer column published in The Chicago Reader, syndicated in thirty newspapers in the United States and Canada, and available online. ...

External links


  Results from FactBites:
 
Syringe: How Products are Made (1876 words)
The hypodermic syringe, also known as the hypodermic needle, is a device used by medical professionals to transfer liquids into or out of the body.
The needle is the part of the device that actually pierces the layers of the skin.
Since hypodermic syringes come in direct contact with the interior of the body, government regulations require that they be made from biocompatible materials which are pharmacologically inert.
Guard assembly for hypodermic needle - Patent 4883469 (4389 words)
The present invention is a guard assembly for a hypodermic needle that comprises a hinge extending from a central portion of the needle, and a guard portion attached to the hinge.
After the use of the needle, the guard can be detached from the needle, while the hinge remains attached to the needle, and the guard folded across the hinge such that the exposed portion of the needle inserts into the length of the slot within the guard portion.
Hypodermic needle 22 will not pass from the slot 50 unless a greater pressure is exerted on the opposite side of the wall 56.
  More results at FactBites »

 
 

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