Enter your Email address:
Wolters Kluwer Health may email you for journal alerts and information, but is committed
to maintaining your privacy and will not share your personal information without
You currently have
no recent searches
You currently have no recent searches
Ahn, Wonsik MD; Bahk, Jae-Hyon MD; Lim, Young-Jin MD
Department of Anesthesiology and Clinical Research Institute
Seoul National University Hospital
Seoul, Republic of Korea
To the Editor:
The size of needles and catheters is categorized by the “gauge” system. Medical references about the definition of “gauge” are not available. In the early 19th century, Peter Stubs invented the so-called “gauge” system but a definition was not included, and only an arbitrary conversion table for the iron wire existed (1). Recently, the International Organization for Standardization (ISO) published some guidelines for the dimensions of needles and catheters (Tables 1 and 2) (2–4). For the needles, ISO standards for inner and outer diameters (ID and OD) are available, but for the catheters, only OD standards are available. In addition, the needles and catheters of the same gauge appear to have different IDs and ODs. Thus, whenever we want to know the exact ID or OD of needles or catheters, e.g., combined spinal-epidural techniques, spinal needle insertion through an introducer, comparison with French system or guidewire insertion during the retrograde intubation etc., we have to refer to the manufacturer’s catalog or contact the customer representatives. We suggest that ISO should set some guidelines for IDs of catheters because it is ID that mainly determines the amount of flow through the catheter, and that all the standards should be revised to offer less variability in the ID and OD of needles and catheters.
Wonsik Ahn, MD
Jae-Hyon Bahk, MD
Young-Jin Lim, MD
© 2002 International Anesthesia Research Society
Colleague's E-mail is Invalid
Your Name: (optional)
Separate multiple e-mails with a (;).
Thought you might appreciate this item(s) I saw at Anesthesia & Analgesia.
Send a copy to your email
Your message has been successfully sent to your colleague.
Some error has occurred while processing your request. Please try after some time.
An Existing Folder
A New Folder
The item(s) has been successfully added to "".
Login with your LWW Journals username and password.
Username or Email:
Need to Activate a New Subscription?Recently purchased a subscription? Login or Register a new account
and enter your subscription ID, or Subscribe Now!
Become a Society Member
Enter and submit the email address you registered with. An email with instructions to reset your password will be sent to that address.
Link to reset your password has been sent to specified email address.
What does "Remember me" mean?
By checking this box, you'll stay logged in for
days or until you logout. You'll get easier access to your articles, collections,
media, and all your other content, even if you close your browser or shut down your
To protect your most sensitive data and activities (like changing your password),
we'll ask you to re-enter your password when you access these services.
What if I'm on a computer that I share with others?
If you're using a public computer or you share this computer with others, we recommend
that you uncheck the "Remember me" box.
Save my selection