WO2019019167A1 - Indwelling needle with indwelling air cavity capable of quickly observing blood return - Google Patents

Abstract

An indwelling needle, in particular, an indwelling needle with an indwelling air cavity capable of quickly observing blood return, comprising a catheter assembly (1), a barrier member (2) mounted in the inner cavity of the catheter assembly, a puncture needle tube (3), and an operating handle (4) fixedly connected to the needle tube (3). A bubble cavity (1.1) is provided in front of the barrier member (2); the barrier member (2) is disposed behind a side branch opening; the rear end edge of the side branch opening is separated from the front end surface of the barrier member (2) by a distance, the distance being an edge-end distance (L3) that is 2.0-7 mm; the inner cavity of a catheter base within the distance (L3) is the bubble cavity (1.1); the rear portion of the needle tube (3) is fixedly connected to a needle base, and the inner cavity of the needle tube (3) communicates with a blood return cavity (4.1) after the tail end of the needle tube passes backward through a needle base fixing portion; the blood return cavity (4.1) is located at the end of the needle base made of a transparent material; and an air-permeable liquid-tight venting plug (5) is provided on the wall of the blood return cavity (4.1). The following advantages are provided: the needle removal resistance is small; the operation is convenient; quick blood return observation is implemented; and the contamination caused by the blood overflowing through a blood return side hole can be effectively avoided.

Description

Quick observation blood returning indwelling needle with indwelling air cavity Technical field

The present invention relates to an indwelling needle, and more particularly to a quick viewing blood returning indwelling needle having an indwelling air chamber.

Background technique

In the prior art indwelling needle technique, as shown in Fig. 1, it consists of a catheter assembly 1, a barrier member 2 mounted in its inner cavity, a puncture needle tube 3, and an operating handle 4 fixed to the needle tube. The structure retaining needle, the barrier member 2 is composed of a sealing material, the cross section of the material is not preset, and the puncture needle tube 3 is longitudinally penetrated from the center of the cross section, and the cross section of the barrier member after the needle is removed elastically without remaining the pore channel, thereby blocking the liquid . The catheter hub of the catheter assembly is made of a transparent or translucent material to facilitate the return of blood from the lumen of the transparent catheter hub during puncture, and the blood can flow into the lumen of the transparent catheter hub for puncture, a tip opening 3.1 is provided at the front end of the needle, and the puncture is provided. Observe the side hole 3.2 of the blood return, so that the blood flows into the lumen of the needle through the tip opening 3.1, and then flows out through the blood return side hole 3.2, enters the annulus between the needle tube and the catheter, and then flows into the lumen of the transparent catheter seat to determine whether the needle tip is stabbed. Into the blood vessels. The distance between the front end of the tip opening 3.1 and the rear end of the blood return side hole 3.2 is the sharp hole distance. In this configuration, the indwelling needle is withdrawn after the puncture is completed, especially when the needle portion of the needle is partially withdrawn into the barrier member, and the barrier member must be of sufficient length to completely cover the tip opening and the blood returning hole on the needle tube at the same time. Blood that does not pass through the lumen of the transparent catheter canal is leaked through the lumen of the front end of the needle and the hole of the blood returning out of the catheter hub, causing blood contamination. In this configuration, in order to ensure no hemorrhage, the length of the barrier member must be made longer than the distance between the sharp holes, thus increasing the contact area between the barrier member and the outer surface of the needle tube passing therethrough, and the frictional resistance during the natural needle withdrawal process is greatly increased. Increased deficiencies. At the same time, this configuration is prone to another shortcoming: due to the long-term storage and transportation of the indwelling needle, the barrier and the needle tube are in a compression state for a long time, and the barrier member is compressed to produce an unrecoverable deformation when the needle is withdrawn. After that, the hole formed by the long-term compression of the needle tube on the barrier member is prone to the phenomenon that it cannot be closed in time, and the unreturned blood returning quickly overflows from the hole. At the same time, this technique has a small deviation of the inner diameter of the catheter caused by the catheter manufacturing, which causes the annulus of the needle tube and the catheter to be too narrow, and the blood returning into the catheter socket is very slow, especially for small-sized indwelling needles, and the problem is more serious. The waiting time of the volunteers has been greatly extended, affecting the puncture operation.

Summary of the invention

The object of the present invention is to overcome the deficiencies in the prior art, and to provide a quick observation blood returning indwelling needle with an indwelling air cavity which has less needle withdrawal resistance and can effectively block blood return overflow and can quickly observe blood return.

The object of the present invention is achieved by the following route.

A quick-viewing blood returning indwelling needle having an indwelling air cavity, comprising a catheter assembly, a barrier member mounted in the inner cavity thereof, a puncture needle tube and an operating handle fixed to the needle tube, the tip end of the needle tube being provided with a tip-opening catheter seat having a lateral indwelling passage, The channel and the lumen of the catheter socket intersect with a side branch aperture, and the main point of the composition is that there is a bubble chamber in front of the barrier member, the barrier member is disposed behind the side branch aperture, and the rear edge of the side branch aperture and the barrier member There is a distance between the front end faces, and the distance is a distance along the end. The distance between the end faces is 2.0-7 mm. The inner cavity of the catheter seat in the distance between the ends is a bubble cavity, and the rear end of the needle tube is fixed on the needle seat and the tail end thereof is oriented. After passing through the needle seat fixing portion, the inner cavity of the needle tube communicates with the blood returning chamber, and the blood returning chamber is located at the tail end of the transparent material, and the ventilating cavity is provided with a gas permeable and permeable ventilating plug.

Before puncturing the blood vessel, connect the infusion set, tilt the needle tip downward or flat, open the infusion device flow regulating valve to remove the air in the pipeline, and the end surface (front end surface) and the side branch hole of the barrier member toward the side branch opening A bubble chamber is formed between the rear end edge (the rear end edge) of the mouth (ie, along the end distance from the length space), and the bubble in the bubble chamber is equivalent to the liquid pressure, blocking the flow of the liquid to the end surface of the barrier. The exhaust completes the closed wall flow regulating valve. According to the use of the indwelling needle, the indwelling needle is used to puncture the patient's blood vessel. When the needle tip penetrates into the blood vessel, the blood passes through the inner lumen of the needle tube, flows out from the tail end of the needle tube, enters the blood returning chamber, and can quickly observe the blood return through the transparent material. The needle tip has entered the blood vessel, and then the catheter is pushed, and the needle tube in the catheter is gradually withdrawn. When the indwelling needle is successfully inserted into the tube, the needle tube is withdrawn and the needle portion of the needle is partially withdrawn to the vicinity of the barrier member due to the bubble pressure in the bubble chamber and the catheter seat. The blood pressure in the chamber is consistent, blocking the flow of blood to the end surface of the barrier. When the barrier is deformed by the compression of the needle tube, the slow self-closing recovery after the removal of the needle tube firstly overflows the bubble in the bubble chamber first, and the blood can reach the barrier. The end face of the piece gives the barrier member a self-closing time and eliminates the blood spillage, so that the needle can be easily withdrawn.

In this way, not only can the blood return quickly, but since there is no blood returning hole, there is no needle tip opening relative to the blood return side. The distance of the hole of the hole is such that there is no setting in which the length of the barrier is larger than the distance of the hole. Thus, the barrier member can be made sufficiently short, even if it is slightly larger than the length of the tip opening, so that the needle withdrawal resistance can be greatly reduced.

The object of the present invention can also be achieved by the following means.

The distance along the end is preferably from 3.0 to 4.0 mm.

If the distance along the end is too small, it is not easy to form an effective bubble chamber. Too large, the longitudinal length of the entire catheter seat is too large, and the distance between the ends is 2.0-7.0 mm. These two points can be considered, but the best choice is 3.0-4.0 mm.

In summary, the present invention has the following advantages over the prior art: the needle withdrawal resistance is small, the operation is convenient, and at the same time, the blood can be effectively prevented from overflowing through the blood return side hole, thereby solving the problem that has long plagued the field due to the barrier member. The hole formed by long-term compression of the needle tube cannot be closed in time, causing the technical problem that the unreturned blood returning quickly overflows from the hole. At the same time, the needle withdrawal resistance is small, the blood return observation is fast, and the operation is convenient.

DRAWINGS

1 is a schematic view showing the structure of an indwelling needle in the prior art.

Figure 2 is a schematic view showing the structure of an indwelling needle having an indwelling air chamber according to a preferred embodiment of the present invention;

The invention will now be described in greater detail with reference to the drawings.

Detailed ways

Best embodiment:

Referring to Figure 2, an indwelling needle having an indwelling air chamber includes a catheter assembly 1, a barrier member 2 mounted therein, a puncture needle cannula 3, and an operating handle 4 secured to the needle cannula. The barrier member 2 is composed of a sealing material that blocks the liquid. The cross section of the material is not preset. However, a through slit is generally prefabricated at the penetration of the needle tube to facilitate the penetration of the needle tube and to close after the needle tube is withdrawn. Since the barrier member 2 in this embodiment can be made sufficiently short, the length L1 only needs to be slightly larger than the length of the tip opening 3.1, and therefore, it is not necessary to preset the aforementioned slit. The puncture needle 3 penetrates longitudinally from the center of the cross section. The tip end of the needle tube is provided with a tip opening 3.1, the blood flows into the lumen of the needle tube through the tip opening 3.1, and then flows back into the blood chamber 4.1 through the tail end thereof. The blood return chamber 4.1 is located at the tail end of the catheter seat, and is made of a transparent material, so that the needle tip can be judged whether Pierce into the blood vessels. Needle The rear of the tube is fixed on the pin hole 4.2 of the needle seat, and the tail end thereof passes through the pin hole 4.2, and the inner cavity of the needle tube communicates with the blood return chamber. The blood return chamber is located at the tail of the transparent material needle seat, and the blood return chamber wall is provided with Breathable liquid-tight venting plug 5. There is a bubble chamber 1.1 in front of the barrier member, and the barrier member 2 is disposed behind the side branch aperture. The rear end of the side branch aperture has a distance from the front end surface of the barrier member. The distance is the distance L3 along the end, and the distance between the ends is L3. For 2.0-7.0 mm, the best choice is 3.0-4.0 mm, and the lumen of the catheter hub within the distance of the end is a bubble chamber 1.1.

Before puncturing the blood vessel, connect the infusion set, tilt the needle tip downward or flat, open the infusion device flow regulating valve to remove the air in the pipeline, and the end surface (front end surface) and the side branch hole of the barrier member toward the side branch opening The edge of the mouth (the trailing edge) forms a bubble chamber 1.1 (ie, within the length space along the end). The bubble in the bubble chamber 1.1 is equivalent to the liquid pressure, blocking the flow of liquid to the end face of the barrier, and the exhaust completes the flow regulating valve of the closed wall. After the exhaust is completed, the needle tip is re-introduced to return to the original state, and then the puncture vessel operation can be performed. When the needle tip penetrates into the blood vessel, the blood rapidly flows into the blood return cavity of the operation handle through the lumen of the needle lumen, and it can be judged that the needle tip has penetrated the blood vessel, and then the needle tip has been pierced into the blood vessel, and then The subsequent tube can be operated. When the indwelling needle is successfully inserted into the tube, the needle is removed and the needle portion of the needle is partially withdrawn to the vicinity of the barrier. The needle is still withdrawn at a normal needle withdrawal speed due to the bubble pressure in the bubble chamber and the catheter seat. The blood pressure in the chamber is consistent, blocking the flow of blood to the end face of the barrier, which blocks the blood from entering the lumen of the needle through the tip opening of the needle. At the same time, since the bubble in the bubble chamber blocks the flow of blood to the end surface of the barrier member, when the barrier member is deformed by the compression of the needle tube, when the slow recovery occurs after the needle tube is removed, the bubble in the bubble chamber first overflows, and the blood can reach the blood. The end face of the barrier member restores the self-closing time of the barrier member, thereby eliminating blood spillage and thus allowing the needle to be easily withdrawn. This configuration of the indwelling needle returns blood quickly, and there is also the advantage that there is no problem of overflow of the blood returning side hole during the needle withdrawal operation.

The parts not described in this embodiment are the same as the prior art.

Claims (2)

A quick-viewing blood returning indwelling needle having an indwelling air cavity, comprising a catheter assembly, a barrier member mounted in the inner cavity thereof, a puncture needle tube and an operating handle fixed to the needle tube, the tip end of the needle tube being provided with a tip-opening catheter seat having a lateral indwelling passage, The channel and the lumen of the catheter hub intersect with a side branch aperture, wherein the barrier has a bubble chamber in front of the spacer, the barrier member is disposed behind the side branch aperture, and the rear end of the side branch aperture and the front end of the barrier There is a distance between the faces, the distance is the distance along the end, the distance between the ends is 2.0-7mm, the inner cavity of the catheter seat is the bubble cavity, the rear of the needle is fixed on the needle seat and the tail end thereof is backward After passing through the fixed portion of the needle seat, the inner cavity of the needle tube communicates with the blood returning chamber, and the blood returning chamber is located at the tail of the transparent material, and the ventilating cavity is provided with a gas permeable and liquid permeable plug. A rapid observation blood returning indwelling needle with an indwelling air chamber according to claim 1, wherein the distance along the end is preferably from 3.0 to 4.0 mm.

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