Arterial indwelling needle

Abstract

The invention provides an arterial indwelling needle, which comprises a soft cannula, a hard metal needle core, a guide wire and a blood storage chamber. The blood storage chamber includes a driving cavity and a blood storage cavity; the driving cavity is located at in the middle section of the blood storage chamber; one end of the driving cavity, close to the hard metal needle core, is blocked byan isolation wall; one end of the driving cavity, far from the hard metal needle core, is slidably blocked by a sliding piston; the isolation wall is fixedly arranged inside the blood storage chamber; the blood storage chamber is divided by the driving cavity into a first blood storage cavity and a second blood storage cavity; the first blood storage cavity and the second blood storage cavity arecommunicated with each other through a catheter; one end of the guide wire is fixed in the middle section of the sliding piston, and the other end passes through the isolation wall and extends into athrough cavity of the hard metal needle core; and the sidewall of the driving cavity is provided with a vent hole. With the application of the indwelling needle, the success rate of the arterial catheterization can be improved.

Description

technical field [0001] The present application relates to the field of medical devices, in particular to an arterial indwelling needle. Background technique [0002] Arterial puncture catheterization can quickly detect the fluctuation of arterial blood pressure, which provides favorable conditions for better management of patients, so it is more and more used in clinical practice, for example, various critically ill patients and complex major operations and effective Surgery for massive bleeding; open-heart surgery with cardiopulmonary bypass; surgery requiring hypothermia and controlled hypotension; severe hypotension, shock and other operations that require repeated blood pressure measurements; patients who need to repeatedly take arterial blood samples for blood gas analysis and other measurements; need Those who continue to use vasoactive drugs; patients who have been resuscitated after respiratory and cardiac arrest; those who cannot perform non-invasive pressure measur...

AI Technical Summary

Problems solved by technology

However, since blood vessels are elastic tissues, the blood vessel wall will closely adhere to the outer wall of the metal needle core. Because the metal needle core enters the blood vessel with an acute angle slope, the plastic sleeve will compress the outer wall of the blood vessel. Because the outer diameter of the plastic sleeve is larger than the metal needle core ,During the catheterization process, the plastic sleeve will push the outer wall of the blood vessel away from the deformation, causing the metal needle core to fall off the blood vessel cavity, which will lead to the failure of the catheterization operation; Before continuing to insert a certain depth along the inner cavity of the blood vessel, it is ensured that the metal needle core can be withdrawn after the plastic sleeve enters the inner cavity of the blood vessel. The core can smoothly advance along the inner wall of the blood vessel without puncturing the inner wall of the opposite vessel. This also leads to the failure of catheterization; (2) In the absence of guide wire assistance, it is necessary to fix the metal needle core with one hand and insert the plastic sleeve with the other hand In the actual puncture, it is often necessary to change hands. Taking right-handedness as an example, because the operator is accustomed to using the right hand, he often uses the right hand to puncture the artery. After blood returns, the left hand fixes the metal needle core, and the right hand inserts the plastic sleeve. During the handover process, due to the small diameter of the artery (for example, the radial artery is about 1 to 2 mm), it is easy to cause the needle tip to detach from the artery, resulting in the failure of catheterization; if there is a guide wire to assist, insert the guide wire It is necessary to meet the requirement that the inclined surface of the opening of the metal needle core stay in the vascular cavity. In clinical practice, because the operator needs to insert the guide wire by hand, it is easy to cause the opening of the inclined surface of the metal needle core to break away from the inner cavity of the blood vessel; (3) Determine whether the metal needle tip is in the blood vessel The method of the cavity is to see if the puncture needle is returning blood. Due to the small volume of the blood storage chamber and the high arterial pressure, it will be filled in less than 1 second after the blood flows in, and there will be no visible changes after that. At this time, the needle tip of the metal needle core The relationship with the lumen of the vessel cannot be judged, thus causing catheterization failure

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