CN103463691A - Venous indwelling needle for hemodialysis - Google Patents

Abstract

A venous indwelling needle for hemodialysis, comprising a steel needle and its penetrating catheter, a catheter holder, a silicone hose, an arterial blood-draining end connector and a tube plug. An elastic clip is arranged in the tube plug, and the elastic clip is used to prevent the needle from breaking away from the tube plug when the needle is withdrawn. There are also butterfly wings and flow control clips on the catheter adapter and the silicone hose respectively. The present invention provides a safe and effective way of withdrawing needles, avoiding the danger of needles stabbing patients or medical staff when withdrawing needles; by adding a clip to the silicone hose, the inconvenience of using vascular forceps is eliminated It is more convenient and safer; it is equipped with a 360° rotatable butterfly wing, which is convenient for puncturing, and increases the fixable area. The needle is fixed more firmly through the adhesive tape, and it is not easy to fall out, which overcomes the existing The deficiency that the venous indwelling needle for hemodialysis is easy to fall off.

Description

A kind of intravenous indwelling needle for hemodialysis

technical field

The invention relates to a medical device, in particular to an intravenous indwelling needle for hemodialysis.

Background technique

Uremic patients need hemodialysis to save their lives. Patients who undergo hemodialysis for a long time need to establish arteriovenous fistula, which is the lifeline of hemodialysis patients. However, some patients have poor blood vessel conditions due to their own diseases, and cannot establish arteriovenous fistulas and artificial vascular fistulas, and even permanent catheters cannot be established. External jugular vein puncture saved the patient's life. The intravenous indwelling needle plays an important role.

At present, the most widely used in China is the intravenous indwelling needle for hemodialysis imported from Japan. This indwelling needle has the advantages of precise design and good puncture performance, but it still has the following shortcomings, such as: there is the problem of unstable fixation, and the patient's neck is twisted. It is easy to dislodge during movement, resulting in blood loss and interrupting dialysis; the silicone hose part is too short, and it is inconvenient to clamp this part with a vascular clamp before the machine is used to draw blood, and the vascular clamp is a heavy metal object, which is easy to pull Pulling the intravenous indwelling needle for dialysis will cause the needle to shift or even come out, which will more easily pinch the patient and increase the pain of the patient. There is also the disadvantage of being inconvenient to hold. The catheter seat of the indwelling needle is a tapered structure, which needs to be held firmly during use. But the main disadvantage is that when the needle is withdrawn, the needle will be exposed from the catheter, which may pierce the hands of the patient or the medical staff, causing puncture wounds in the slightest and infection in severe cases. For this situation, the medical staff can only withdraw the needle as much as possible Slow down to avoid the rapid exposure of the needle, but the strength is not easy to control. In short, when the needle is about to be exposed, it may bring great danger to the medical staff.

Contents of the invention

The purpose of the present invention is to provide an intravenous indwelling needle for hemodialysis to make up for the deficiency of the existing indwelling needle for dialysis.

A venous indwelling needle for hemodialysis, comprising a main body of the indwelling needle and a puncture needle, the main body of the indwelling needle includes a catheter, a catheter base, a silicone hose, an arterial blood-draining end connector and a plug connected in sequence, and the puncture needle It includes a steel needle with a needle seat connected to the end, and the steel needle runs through the main body of the indwelling needle, and is characterized in that:

The outer surface of the steel needle is provided with three notches along the length direction at a position close to the needle tip, and the three notches evenly surround the axis of the steel needle, that is, the angle between any two is 120 degrees. One end of the notch close to the needle tip is provided with a barb, and the other end is provided with a bevel;

The pipe plug includes a pipe plug seat with an axial circular groove on the upper end surface and a hollow cylindrical sleeve, the center of the bottom of the circular groove is perforated, the sleeve is installed in the circular groove and the The elastic clip is crimped at the bottom of the circular groove, and the elastic clip is used to prevent the needle head of the steel needle from detaching from the tube plug (8) when the needle is withdrawn. The sleeve can be connected by thread, elastic clip, rotary clip, etc. It is fixed in the circular groove to realize the limit of the elastic clip so that it will not break away from the bottom of the circular groove;

The elastic clip includes a pair of elastic U-shaped wires, and the top ends of the two U-shaped wires are arranged opposite to each other. The distance between the top ends is smaller than the diameter of the above-mentioned perforation. Connect with the end of another U-shaped wire, and the long arc segment coincides with the bottom of the circular groove;

A marking point is also provided on the outer surface of the plug seat, and the marking point is collinear with the vertices of the two long arc segments. When used for assembly, when the needle tip needs to be inserted from under the plug seat, first turn the needle tip to the inner side of the plug seat corresponding to the marked point (or its opposite position), and then it will not be U-shaped when piercing. Silk hooked.

The above-mentioned pipe plug seat is provided with a stopper at the bottom of its circular groove, and above the stopper is provided with an arc-shaped baffle whose length is greater than the width of the stopper;

There is a notch in the middle of one of the long arc sections of the above-mentioned elastic clip, and the width of the notch matches the width of the stopper.

The purpose of this structure is to facilitate installation. When installing, first put the two ends of the notch against the two sides of the stopper, so that the elastic clip will not rotate at the bottom of the circular groove, and then press the long arc section on the other side to the bottom The advantage of setting the baffle is that the length of the baffle is longer than the notch, so it can press the elastic clips on both sides of the notch. When installing, you only need to press down the long arc section on the other side without using I am worried that the long arc on the opposite side may stretch out.

There is a radial retaining ring with a through hole in the middle of the above-mentioned casing to divide the casing into upper and lower chambers, and a tube core is plugged in the upper cavity, the tube core is made of silica gel material, and the tube The middle part of the core also has a hole communicating with the above-mentioned through hole.

The function of the die is to stabilize the withdrawal and insertion of the needle, especially when the needle is withdrawn, since the die of silica gel has a certain friction force, it can reduce the needle withdrawal speed.

The diameter of the upper end of the hole in the middle of the tube core is smaller than the diameter of the steel needle, and the diameter of the lower end of the hole is greater than or equal to the diameter of the steel needle.

The advantage of this design is that when the needle is withdrawn, because the diameter of the upper port is smaller than the diameter of the steel needle, the barb on the notch of the steel needle will inevitably hook the upper end of the tube core, which will reduce the needle withdrawal speed or stop the needle withdrawal, so that the needle does not move. The purpose that will disengage from the pipe plug.

The silicone hose is provided with a flow control clip.

A butterfly wing is also provided on the catheter base, and the butterfly wing includes a pair of fins symmetrically arranged on the catheter base.

The above-mentioned butterfly wing also includes a sleeve, the sleeve is sleeved in the middle of the catheter base, and the fins are fixed on the sleeve.

The above-mentioned elastic clip is replaced by two elastic wires, the two elastic wires are arranged in parallel above the perforation, and the distance between the two elastic wires is smaller than the diameter of the perforation, and the mark point is located between the two elastic wires. between extension cords.

This principle is similar to the snap buttons on traditional clothes and bags. When the steel needle passes through the position without the notch, the two elastic wires can be stretched to both sides. Into the notch, hooked by the barb at the upper end of the notch, also plays the role of preventing the needle from breaking away from the tube plug. The marking points are also for ease of assembly.

The invention has the advantages of simple structure, convenient manufacture, convenient use and good use effect. A clip is added to the silicone hose, and the silicone hose is 2cm longer than the existing length (at the same time, the steel needle is also lengthened by 2cm), which saves the inconvenience and potential danger of using a vascular clamp, and is more convenient. Safer; 360° rotatable butterfly wings are installed, one is easy to puncture, the other is to increase the fixable area, the needle is fixed more firmly through the adhesive tape, and it is not easy to fall out, which overcomes the easy fall off of the existing intravenous indwelling needle for hemodialysis lack of. More importantly, it provides a safe and effective way to withdraw the needle. Since the needle has three evenly distributed notches, there is always a notch that can hook the U-shaped wire or elastic wire, so that the needle will not be exposed when the needle is withdrawn. Tube stopper, so as to avoid the danger that the needle may stab the patient or the medical staff when the needle is withdrawn.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a schematic diagram of an exploded structure of the present invention.

Fig. 3 is a schematic diagram of the sleeve and its plug of the present invention.

Fig. 4 is a schematic diagram of the sleeve and the plug of the tapered through hole of the present invention.

Fig. 5 is a schematic view of the plug seat and its elastic clips of the present invention.

Fig. 6 is a cross-sectional view along line A-A of Fig. 5 .

Fig. 7 is a B-B sectional view of Fig. 5 .

Fig. 8 is a top view of the plug seat of the present invention.

Fig. 9 is a schematic diagram of the elastic clip with notches of the present invention.

Fig. 10 is a schematic structural view of the steel needle of the present invention.

Fig. 11 is a top view of the plug seat using elastic wire according to the present invention.

Fig. 12 is a schematic diagram of the elastic clip of the present invention.

Among them, 1. Steel needle, 2. Catheter, 3. Catheter seat, 4. Butterfly wing, 5. Silicone hose, 6. Flow control clamp, 7. Arterial blood-drawing end connector, 8. Tube plug, 9. Needle seat , 10, fins, 11, casing, 12, tube core, 13, retaining ring, 14, casing, 15, through hole, 16, round groove, 17, elastic clip, 18, pipe plug seat, 19, perforation , 20. Marking point, 21. Block, 22. Baffle, 23. Barb, 24. Notch, 25. Bevel, 26. Elastic wire, 27. U-shaped wire, 28. Long arc, 29. Notch .

Detailed ways

As shown in Figures 1 and 2, an intravenous indwelling needle for hemodialysis includes a main body of the indwelling needle and a puncture needle. The end joint 7 and the tube plug 8, the puncture needle includes a steel needle 1 with a needle seat 9 connected at the end, and the steel needle 1 runs through the main body of the indwelling needle, characterized in that:

As shown in Figure 10, the outer surface of the steel needle 1 is provided with three notches 24 sequentially along the length direction near the needle tip, and the three notches 24 evenly surround the axis of the steel needle 1, that is, between two The included angle between them is 120 degrees, and the end of the notch 24 near the needle tip is provided with a barb 23 (as shown in Figure 10, the barb is formed as a barb in a side view because its inner wall is inclined to the direction of the needle. shape), the other end is provided with a slope 25;

As shown in Figures 3, 4, and 5, the pipe plug 8 includes a pipe plug seat 18 with an axial circular groove 16 on the upper end surface and a hollow cylindrical sleeve 14, and the center of the bottom of the circular groove 16 has a perforation 19. The sleeve 14 is installed in the circular groove 16 and the elastic clip 17 is crimped on the bottom of the circular groove 16. The elastic clip 17 is used to block the needle head of the steel needle 1 from the tube plug 8 when the needle is withdrawn. Inner disengagement, the sleeve 14 can be fixed in the circular groove 16 by means of threaded connection, elastic clamping, rotating clamping, etc. so as to realize the limit of the elastic clip 17, so that it will not break away from the bottom of the circular groove 16;

As shown in Figure 12 , the elastic clip 17 includes a pair of elastic U-shaped wires 27, and the tops of the two U-shaped wires 27 are arranged oppositely, and the distance between the tops is smaller than the diameter of the above-mentioned perforation 19, and one U-shaped wire 27 The two ends of each are connected to the end of another U-shaped wire 27 via two long arc sections 28, and the long arc sections 28 coincide with the bottom of the circular groove 16;

As shown in FIG. 8 , a marking point 20 is also provided on the outer surface of the plug seat 18 , and the marking point 20 is collinear with the vertices of the two long arc segments 28 . For assembly, when the needle tip needs to be inserted from under the plug seat 18, first turn the needle tip to the inner side of the plug seat 18 corresponding to the marked point 20 (or its opposite position), and then not to Hooked by U-shaped wire.

As shown in Figures 6 and 7, the above-mentioned pipe plug seat 18 is provided with a stopper 21 at the bottom of its circular groove 16, and above the stopper 21 is provided with an arc-shaped baffle 22 whose length is greater than the width of the stopper 21;

As shown in FIG. 9 , there is a notch 29 in the middle of one of the long arc segments 28 of the elastic clip 17 , and the width of the notch 29 matches the width of the stopper 21 .

The purpose of this structure is to be easy to install, and when installing, at first put the two ends of the notch 29 against the both sides of the block 21, so that the elastic clip 17 will not rotate at the bottom of the circular groove 16, and then place the long clip on the other side The arc section 28 can be pressed to the bottom; the benefit of setting the baffle plate 22 is that the length of the baffle plate 22 is longer than that of the notch 29, so it can press the elastic clips 17 on both sides of the notch 29. The arc section 28 can be pressed down, and there is no need to worry that the long arc section 28 on the opposite side may stretch out.

As shown in Figure 3, the above-mentioned casing 14 is provided with a radial stop ring 13 with a through hole 15 in the middle to divide the casing 14 into upper and lower chambers, and a tube core 12 is plugged in the upper chamber. , the tube core 12 is made of silica gel material, and the middle part of the tube core 12 also has a hole that communicates with the above-mentioned through hole 15 .

The effect of the tube core 12 is to stabilize the withdrawal and insertion of the needle, especially when the needle is withdrawn, because the silicone tube core 12 has a certain friction force, it can reduce the needle withdrawal speed.

As shown in FIG. 4 , the diameter of the upper end of the hole in the middle of the tube core 12 is smaller than the diameter of the steel needle 1 , and the diameter of the lower end of the hole is greater than or equal to the diameter of the steel needle 1 .

The advantage of this design is that when the needle is withdrawn, because the diameter of the upper port is smaller than the diameter of the steel needle 1, the barb 23 on the notch 24 of the steel needle 1 will inevitably hook the upper end of the tube core 12, thereby reducing the needle withdrawal speed or stopping the needle withdrawal. effect, thereby reaching the purpose that the needle will not disengage from the tube plug 8.

As shown in FIG. 1 , the silicone hose 5 is provided with a flow control clamp 6 .

As shown in FIG. 1 , a butterfly wing 4 is further provided on the catheter adapter 3 , and the butterfly wing 4 includes a pair of fins 10 symmetrically arranged on the catheter adapter 3 . The butterfly wing 4 can be made of bendable elastic silicone material.

As shown in FIG. 2 , the butterfly wing 4 further includes a sleeve 11 , the sleeve 11 is sheathed in the middle of the catheter adapter 3 , and the fins 10 are fixed on the sleeve 11 .

When assembling, first put the elastic clip 17 into the plug seat 18, press it tightly with the sleeve 14, and then use the assistance of the marking point 20 to pass the steel needle 1 through the plug 8 from bottom to top, and insert the tube core 12 from the Put the pillow on the steel needle 1, and continue to insert the stylet 12 downwards into the upper half of the sleeve 14; finally, the assembly can be completed by passing through the arterial blood-drawing end joint 7 to the catheter 2, during which the notch The barb 23 of 24 will not hinder the progress of the assembly, and the bevel 25 of the notch 24 will not hinder the whole assembly. The butterfly wing 4 and the flow control clip 6 can be sleeved on the catheter adapter 3 and the silicone hose 5 in advance, respectively.

The present invention also has the following scheme:

As shown in Figure 11, the elastic clip 17 is replaced by two elastic wires 27, the two elastic wires 27 are arranged in parallel above the perforation 19, and the distance between the two elastic wires 27 is smaller than the diameter of the perforation 19, And the said marking point 20 is located between the extension lines of the two elastic threads 27 .

This principle is similar to the snap buttons on traditional clothes and bags. When the steel needle 1 passes through without a notch, the two elastic threads 27 can be stretched to both sides. When the notch 24 passes through, the elastic threads 27 can Elastic reset and enter in the notch 24, be hooked by the barb 23 on the notch 24 upper end, play the effect that prevents needle from breaking away from pipe plug 8 equally.

Its assembly method is similar to the previous one, except that the needle head can pass between two parallel elastic wires 27 with the aid of the marking point 20 .

When in use, the patient is placed in a supine position with the neck straight and the head slightly to the left to fully expose the jugular vein and sterilize the puncture site. Adjust the angle of the tube 11, insert the needle with both wings, see the return of blood, put the indwelling needle flat, withdraw the steel needle 0.5cm, put the indwelling needle in, withdraw all the steel needle 1, clamp the flow control clamp 6, and fix it with adhesive tape. Unscrew the stopper 8 of the indwelling needle, connect the joint part of the arterial blood-leading end 7 with the indwelling needle tightly, and draw blood on the machine.

Claims (8)

1. An intravenous indwelling needle for hemodialysis, comprising a main body of the indwelling needle and a puncture needle; An end joint (7) and a tube plug (8), the puncture needle includes a steel needle (1) connected to a needle seat (9) at the end, and the steel needle (1) runs through the main body of the indwelling needle, which Features: The outer surface of the steel needle (1) is provided with three notches (24) sequentially along the length direction near the needle tip, and the three notches (24) evenly surround the axis of the steel needle (1). One end of the notch (24) close to the needle tip is provided with a barb (23), and the other end is provided with a bevel (25); The pipe plug (8) includes a pipe plug seat (18) with an axial circular groove (16) on the upper end surface and a hollow cylindrical sleeve (14), and the center of the bottom of the circular groove (16) is perforated (19), the sleeve (14) is installed in the circular groove (16) and the elastic clip (17) is crimped on the bottom of the circular groove (16), and the elastic clip (17) is used when withdrawing the needle The needle head of the blocking steel needle (1) is separated from the pipe plug (8); The elastic clip (17) includes a pair of elastic U-shaped wires (27), and the top ends of the two U-shaped wires (27) are arranged oppositely, and the distance between the top ends is smaller than the diameter of the above-mentioned perforation (19). The two ends of the wire (27) are respectively connected to the ends of another U-shaped wire (27) via two long arc segments (28), and the long arc segments (28) coincide with the bottom of the circular groove (16); A marking point (20) is also provided on the outer surface of the pipe plug seat (18), and the marking point (20) is collinear with the vertices of the two long arc segments (28). 2. The intravenous indwelling needle for hemodialysis according to claim 1, characterized in that the stopper (18) is provided with a stopper (21) at the bottom of the circular groove (16), and the stopper (21) An arc-shaped baffle (22) whose length is greater than the width of the stopper (21) is provided above; There is a notch (29) in the middle of one of the long arc segments (28) of the elastic clip (17), and the width of the notch (29) matches the width of the stopper (21). 3. The intravenous indwelling needle for hemodialysis according to claim 1 or 2, characterized in that the sleeve (14) is provided with a radial stop ring (13) with a through hole (15) in the middle and The sleeve (14) is divided into upper and lower chambers, and a tube core (12) is plugged in the upper chamber. The tube core (12) is made of silica gel material, and the middle part of the tube core (12) is also opened with a Through holes (15) are connected holes. 4. The venous indwelling needle for hemodialysis according to claim 1 or 2, characterized in that the diameter of the upper end of the hole in the middle of the tube core (12) is smaller than the diameter of the steel needle (1), and the diameter of the lower end is greater than or equal to the diameter of the steel needle (1) )diameter. 5. The intravenous indwelling needle for hemodialysis according to claim 1, characterized in that the silicone hose (5) is provided with a flow control clip (6). 6. The intravenous indwelling needle for hemodialysis according to claim 1, characterized in that a butterfly wing (4) is provided on the catheter adapter (3), and the butterfly wing (4) includes symmetrically arranged on the catheter adapter (3). ) on a pair of fins (10). 7. The intravenous indwelling needle for hemodialysis according to claim 6, characterized in that the above-mentioned butterfly wing (4) also includes a sleeve (11), and the sleeve (11) is sheathed in the catheter adapter (3). In the middle, the fins (10) are fixed on the sleeve (11). 8. The intravenous indwelling needle for hemodialysis according to claim 1, characterized in that the elastic clip (17) is replaced by two elastic wires (27), and the two elastic wires (27) are arranged in parallel in the perforation ( 19), and the distance between the two elastic threads (27) is smaller than the diameter of the perforation (19), and the marking point (20) is located between the extension lines of the two elastic threads (27).

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