Maro Publications

Catheters

Notes

From 12/13/2013 to 8/7/2012

Maro Topics

Comments

Patents with Abstracts

Balloon Catheters

Medical Devices

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Notes

1. “In Medicine, a catheter /ˈkæθɪtər/ is a tube that can be inserted into a body cavity, duct, or vessel. Catheters thereby allow drainage, administration of fluids or gases, or access by surgical instruments. The process of inserting a catheter is catheterization. In most uses, a catheter is a thin, flexible tube ("soft" catheter), though in some uses, it is a larger, solid ("hard") catheter. A catheter left inside the body, either temporarily or permanently, may be referred to as an indwelling catheter. A permanently inserted catheter may be referred to as a permcath (originally a trademark).

The ancient Syrians created catheters from reeds. "Katheter - καθετήρ" originally referred to an instrument that was inserted such as a plug. The word "katheter" in turn came from "kathiemai - καθίεμαι" meaning "to sit". The ancient Greeks inserted a hollow metal tube through the urethra into the bladder to empty it and the tube came to be known as a "katheter".

Placement of a catheter into a particular part of the body may allow:
draining urine from the urinary bladder as in urinary catheterization, e.g., the intermittent catheters or Foley catheter or even when the urethra is damaged as in suprapubic catheterisation.
drainage of urine from the kidney by percutaneous (through the skin) nephrostomy
drainage of fluid collections, e.g. an abdominal abscess
administration of intravenous fluids, medication or parenteral nutrition with a peripheral venous catheter
angioplasty, angiography, balloon septostomy, balloon sinuplasty, cardiac electrophysiology testing, catheter ablation. Often the Seldinger technique is used.
direct measurement of blood pressure in an artery or vein
direct measurement of intracranial pressure|
administration of anaesthetic medication into the epidural space, the subarachnoid space, or around a major nerve bundle such as the brachial plexus
administration of oxygen, volatile anesthetic agents, and other breathing gases into the lungs using a tracheal tube
subcutaneous administration of insulin or other medications, with the use of an infusion set and insulin pump
A central venous catheter is a conduit for giving drugs or fluids into a large-bore catheter positioned either in a vein near the heart or just inside the atrium.
A Swan-Ganz catheter is a special type of catheter placed into the pulmonary artery for measuring pressures in the heart.
An embryo transfer catheter is designed to insert fertilized embryos from in vitro fertilization into the uterus. They may vary in length from approximately 150 mm to 190 mm.
|An umbilical line is a catheter used in Neonatal Intensive Care Units (NICU) providing quick access to the central circulation of premature infants.
A Tuohy-Borst adapter is a medical device used for attaching catheters to various other devices.
A Quinton catheter is a double or triple lumen, external catheter used for hemodialysis.
An intrauterine catheter, such as a device known as a 'tom cat', may be used to insert specially 'washed' sperm directly into the uterus in artificial insemination. A physician is required to administer this procedure.”

(Wikipedia, Catheters, 8/7/2012)

2. “Catheters for the introduction or removal of fluids may be located in various venous locations and cavities throughout the body for the introduction or removal of fluids. Such catheterization may be performed by using a single catheter having multiple lumens. A typical example of a multiple lumen catheter is a dual lumen catheter in which one lumen introduces fluids and one lumen removes fluids. Catheterization may also be performed by using separate, single lumen catheters inserted through two different incisions into an area to be catheterized. Procedures are also known as described for inserting two wholly independent single lumen catheters into a vessel through a single insertion site.”[Hamboly, US Patent 8,257,298 (9/4/2012)]

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

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Copyright 2012 by Roger D. Corneliussen.
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