Apparatus for angiography by the injection of CO2

Details Apparatus for angiography by the injection of CO2 Apparatus for angiography by the injection of CO2

2000-07-18

2003-01-07

Walberg, Teresa (Department: 3742)

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

C128S126100

Reexamination Certificate

active

06503226

ABSTRACT:

DESCRIPTION
The present invention is to provide an apparatus for angiography by the injection of CO
2
, which has substantial advantages over the prior art.
As is known, angiography concerns methods of radiological diagnosis by the injection of a contrast medium in order to permit the assessment of vascular lesions, such as stenosis, occlusions, aneurysm, fistulas, etc. Generally, these procedures are carried out in vascular radiology rooms provided with the equipment necessary for carrying out the radiographic technique, normally with radiological systems which permit digital subtraction angiography, or DSA, under the best possible conditions.
Conventional contrast media are based on iodine which is radio-opaque to X-rays. However, iodated contrast media can cause allergies, are nephrotoxic and, likewise, can produce cardiovascular complications.
The introduction of the injection of high-purity or medical grade CO
2
under predetermined and known conditions, such as volume and pressure through a catheter, also enables angiographic processes to be carried out. The CO
2
displaces the blood in the vessel and briefly creates a gas bubble which moves in the direction of blood flow. While the gas is being injected, the digital subtraction angiography equipment takes a series of radiographic images in which the passage of the contrast medium through the vessel being studied is recorded. Afterwards, the best image recorded can be selected to be transferred to a physical support (radiography).
The angiography apparatus to which the present invention relates has advantageous functional features compared with currently known apparatus, providing means that permit the autonomous injection of CO
2
into the blood vessel, having a large number of regulating and control means which enable the process to be carried out and monitored with safety features which have been unknown hitherto and also providing practical means which, in a simple and readily transportable manner, make it possible to have available all the elements for carrying out angiography by injection of CO
2
.
The apparatus to which the present invention relates basically comprises a foot carrying the CO
2
source, and a column carrying, at its upper portion, the movable arm, which is of an articulated type, forming two regions in the second of which the receiving support for the CO
2
-metering device is installed. The movable arm unit is adjustable both in terms of rotation about an axis coinciding with the geometrical axis of the column and in terms of pivoting on the first member of the movable arm, which member is composed of an articulated parallelogram, and, likewise, on the second member of the movable arm, or the support for the metering device, which is also adjustable in terms of rotation with respect to the first arm member. The column accommodates a hand grip and a perfusion support of the type which can be adjusted in height. A screen which is rotatable about the geometrical axis of articulation of the two members forming the movable arm and which is also inclinable, enables the apparatus to be programmed and controlled.
This arrangement permits both an efficient and compact arrangement of all the members making up the apparatus, and efficient control of all the functions thereof.


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