Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-09-05
1999-09-21
Mendez, Manuel
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
A61M 532
Patent
active
059547014
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION:
The present invention relates to a device for detecting and indicating a situation where an intravascular needle has entered a blood conducting vein or artery, and more particularly to a sound or LED signal that indicates when the needle comes into contact with the pressure of blood within a vein or artery, or any other liquid containing cavity.
The invention is based on a very sensitive sensor which makes it possible to obtain the signal immediately after penetration into the vein or the artery
The device according to the invention makes possible of taking visual attention on the puncture spot and not to observe the flashback chamber of the cannula while performing the entry into the patient vessel.
BACKGROUND OF THE INVENTION
Intravenous and arterial cannulas presently in use depend upon a visual observance of blood itself in the hub of the cannula (flashback chamber); After the needle has entered the vein or artery blood does flow through the length of the cannula and fills the flashback chamber in order to indicate that the cannula needle has entered the vessel. The blood according to this method is visible in the chamber after a period of time so the needle may puncture the second wall of the vessel before any sign appears. This may result in improper administration of medication, hemorrhaging, collapse of the vein or artery, or other similar complications.
One method of addressing this situation is disclosed in U.S. Pat. No. 5,030,207. According to that patent a device is provided for indicating when an intravenous needle has entered the vein through the use of a solid fiber optic mounted in the needle for showing visual instantaneous vein entry. The distal end of the fiber optic reflects color, such as red blood to the magnifying system at the rear or proximal end of the fiber optic. The user observes immediate vein entry without any blood flow or exposure to blood. That invention is complicated to manufacture, requires a certain amount of light to work properly, and also forces the user to look and focus at the proximal end of the cannula instead of the puncture point.
Another method of addressing the problem is U.S. Pat. No. 5,314,410 includes a colored flexible membrane disposed within the transparent body of a hypodermic needle that is stretched over the proximal end of the needle cannula. As the needle reaches the inside of the blood vessel, pressure within the vessel is transferred through the cannula to the membrane which moves or inflates indicating entry has been achieve. This device also forces the user to look and focus at the proximal end of the cannula instead of the puncture point.
Both above methods are widely used, however these are somewhat inconvenient to use as the person using the device must look at the device rather than the patient.
In all the above methods the device is part of the cannula in contrary to the present which can be connected to any commercial cannula.
It is thus the main object of the present invention to provide a device which is more reliable because it gives sound signal even at a very low pressure, so that the indication of vessel penetration is prompt. Moreover, with the use of this device the chance of double puncture of the blood vessel decreases.
BRIEF SUMMARY OF THE INVENTION
The device is to be connect to the distal end of the conduit which includes a female luer connection while the device has a male exterior luer connection. It is also possible to connect the device permanently to the needle. When the leading end of the needle enters a blood vessel, blood enters the needle. A sensitive pressure sensor responds to change of pressure from the moment of entry of blood into the needle and activates the signal. The signal may be of a buzzer or whatever similar known device which does emit tones, or a LED or similar visible signal, or an audio visual combination. The signal indication is received quicker than appearance of blood in the transparent chamber.
The present invention enables the recognition of a penetration by a needle
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Mendez Manuel
Vascular Technologies Ltd.
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