Artery puncture needle

Abstract

The invention relates to an artery puncture needle comprising a detaining needle and a puncture needle inserted in the detaining needle. The detaining needle comprises a catheter seat, a detaining needle catheter arranged at the front end of the catheter seat and a pressure measuring joint arranged at the back end of the catheter seat. The catheter seat is a square shell with an opening at the bottom, and a cylindrical type extrusion block is arranged in the catheter seat. The extrusion block is coaxially arranged with the retaining needle catheter and the pressure measuring joint. The extrusion block is a high elastic material with reversible deformation. The middle part of the extrusion block is provided with a through hole along the axis. The through hole is internally provided with a rubber tube. Two ends of the rubber tube are respectively connected with the retaining needle conduit and the pressure measuring joint. An extrusion device for pressing the extrusion block is arrangedin the catheter seat; the puncture needle includes a puncture needle seat, flanks arranged at both side of the puncture needle seat, and a puncture needle tube arranged at the front end of the puncture needle seat.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to an arterial puncture needle. Background technique [0002] Clinically, for critically ill surgical patients or intensive care patients who need continuous monitoring of blood pressure, invasive blood pressure testing is usually used, that is, an arterial indwelling needle is inserted into the artery, and then connected to an arterial manometry device to measure changes in arterial blood pressure in real time. At present, the commonly used arterial indwelling needle is the arterial indwelling needle (20G*45mm) of "BD" company. This kind of arterial indwelling needle is composed of stainless steel needle, indwelling needle and needle cannula. The needle body is an ordinary stainless steel needle tube, which is relatively hard, and the front end is a needle point, which is easy to puncture. The needle seat is located at the end of the stainless steel needle tube, and the h...

AI Technical Summary

Problems solved by technology

[0004] However, this arterial indwelling needle has the following defects: 1) Although closing the blood flow blocking valve can block the blood flow, it cannot completely prevent the blood from overflowing from the catheter adapter tail in actual operation. After the stainless steel needle is pulled out, the blood flow is closed. The time difference before the flow blocking valve will cause blood spurting, which is easy to cause pollution, especially the blood of patients with infectious diseases; 2) The blood flow blocking valve realizes the opening and closing of the lumen channel of the catheter seat by sliding back and forth, and it is easy to The indwelling needle causes an instant impact. When it is pushed forward, it is easy to make it go deep and cause pain to the patient. When it is pulled backward, it is easy to make the indwelling needle catheter fall out of the arterial vessel; When the valve is in the open position, the two are easy to disengage and difficult to insert. If the blood flow blocking valve is in the closed position, the stainless steel needle will be slightly deformed under the action of the blood flow blocking valve, which will affect the use.

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