Syringe

Abstract

The utility model discloses an injector which effectively solves the problem that a catheter is prone to blood return due to the fact that the amount of liquid for flushing and sealing the catheter cannot be accurately controlled. Comprising a needle cylinder with a rightward opening, a plurality of scale marks distributed in the length direction of the needle cylinder are arranged on the outer surface of the needle cylinder, the left end of the needle cylinder communicates with a nipple, a kidney-shaped plate is fixed to the right end of the needle cylinder, a piston is slidably connected into the needle cylinder, and a cross-shaped push rod is fixed to the right side of the piston; a plurality of positioning grooves distributed in the left-right direction are formed in the front and rear sides of the push rod respectively, sliding barrels which can move front and back and are provided with openings facing the push rod are arranged at the front and rear ends of the right side of the needle cylinder respectively, and positioning columns are slidably connected into the sliding barrels; the utility model has the advantages that the structure is ingenious, the use is convenient, after 1ml of normal saline is pushed out, the flushing is paused and repeatedly carried out for many times, so that the normal saline generates turbulent flow in the catheter to flush the residual medicine in the catheter, the blood return phenomenon is effectively avoided, and the popularization and the use are easy.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, especially a syringe. BACKGROUND

[0002] The indwelling needle sealing tube method mainly includes physiological saline sealing tube method, heparin sodium saline sealing tube method, infusion device extrusion sealing tube method and infusion device rapid sealing tube method. Sealing tube is an important link for the application of the indwelling needle. When the infusion is about to end, routine sealing tube needs to be carried out, the smoothness of the venous channel can be maintained, blood clots can be prevented, re-venous injection can be avoided, and the pain of the patient caused by repeated needle pricking can be reduced.

[0003] The physiological saline sealing tube method is to extract physiological saline by using a 5ml syringe when the infusion is about to end. Pulse method of "pushing once and stopping once" is used for pipe flushing. According to the industry standard, 1ml is pushed once, so that the salt water can generate turbulent flow in the catheter to facilitate the flushing of the residual medicine in the catheter. However, the current general syringe has no pressure quantification. When the indwelling needle catheter is flushed and sealed, the flushing and sealing liquid volume cannot be accurately controlled to 1ml. Because of the high pressure in the blood vessel, backflow of blood is easily generated at the tip of the catheter, and the catheter is blocked, which affects the normal infusion next time. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the utility model aims at providing a syringe to solve the problem that the flushing and sealing liquid volume cannot be accurately controlled, which causes backflow of blood in the catheter.

[0005] The technical solution is that the utility model discloses a needle cylinder with the opening facing right, a plurality of scale lines are arranged on the outer surface of the needle cylinder along the length direction, a nipple is connected to the left end of the needle cylinder, a waist plate is fixed to the right end of the needle cylinder, a piston is slidably connected in the needle cylinder, a cross-shaped push rod is fixed to the right side of the piston, the push rod extends out of the needle cylinder and is fixed with a push plate, a plurality of positioning grooves are arranged on the front and back sides of the push rod along the left and right directions, the distance between every two adjacent positioning grooves is equal to the distance between every two adjacent scale lines, a sliding cylinder is arranged on the right side of the needle cylinder and can move forward and backward, the sliding cylinder has an opening facing the push rod, a positioning column is slidably connected in the sliding cylinder, and the inner end of the positioning column can be inserted into the corresponding positioning groove.

[0006] Compared with the prior art, the utility model has the following beneficial effects:

[0007] The utility model has the advantages of clever structure and convenient use. The sliding cylinder and the baffle are arranged, the push rod is pulled to the right, the push rod is released when the baffle contacts with the sliding cylinder, the physiological saline of 1ml can be accurately sucked by the needle cylinder, and the waste caused by over-sucking and the requirement of the flushing and sealing tube caused by under-sucking can be avoided.

[0008] The positioning column and positioning groove are set up so that when the push rod is pushed to the left, it pauses after each 1ml of saline is pushed out and flushes repeatedly to create turbulence in the saline in the catheter, which washes away the residual drugs in the catheter and effectively avoids backflow.

[0009] The curved plate, inclined surface, and notch are designed to position the slide tube, ensuring that the positioning pin continuously enters and slides out of the positioning groove when the piston pushes out the liquid. This strictly adheres to the industry standard of 1ml flushing, improves the flushing and sealing effect, and is easy to promote and use. Attached Figure Description

[0010] Figure 1 This is an isometric drawing of this utility model.

[0011] Figure 2 This is a top view of the present invention.

[0012] Figure 3 This is a utility model Figure 2 Sectional view of AA.

[0013] Figure 4 This is a sectional front view of the present invention.

[0014] Figure 5 This is a sectional top view of this utility model.

[0015] Figure 6 This is a utility model Figure 5 A magnified view of B in the middle. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0017] Depend on Figures 1 to 6 The syringe 1 is provided, with its opening facing right. The outer surface of the syringe 1 has multiple scale lines distributed along its length. The left end of the syringe 1 is connected to a nipple, and the right end of the syringe 1 is fixed with a waist-shaped plate 2. A piston 3 is slidably connected inside the syringe 1. A cross-shaped push rod 4 is fixed to the right side of the piston 3. The right end of the push rod 4 extends out of the syringe 1 and is fixed with a push plate 5. Multiple positioning grooves 6 are provided on the front and rear sides of the push rod 4, distributed along the left and right directions. The distance between any two adjacent positioning grooves 6 is equal to the distance between any two adjacent scale lines. The front and rear ends of the right side of the syringe 1 are provided with sliding cylinders 7, which can move back and forth and have their openings facing the push rod 4. A positioning post 8 is slidably connected inside the sliding cylinder 7, and the inner end of the positioning post 8 can be inserted into the corresponding positioning groove 6.

[0018] To facilitate the smooth and accurate aspiration of 5ml of saline by medical staff, the distance between the left end face of the piston 3 and its adjacent positioning groove 6 is equal to the distance between every two adjacent scale lines. Baffles 9 are fixed on the front and rear sides of the push rod 4, and the right end face of the baffle 9 is flush with the left side face of the leftmost positioning groove 6. The right end face of the baffle 9 can contact the left side of the slide cylinder 7.

[0019] In order to enable the slide cylinder 7 to move back and forth, the syringe 1 has through grooves on both the front and rear sides. The slide cylinder 7 is cross-shaped. The inner end of the slide cylinder 7 is inserted into the groove and is located between the syringe 1 and the push rod 4. The stepped surface of the slide cylinder 7 is connected to the outer surface of the syringe 1 by a compression spring 10. The waist plate 2 is rotatably connected to a ring 11. Two arc-shaped blocks 12 are fixed on the inner surface of the ring 11 in a centrally symmetrical distribution. The end of the arc-shaped block 12 near the slide cylinder 7 is an inclined surface. A notch 13 is opened on the arc-shaped block 12.

[0020] To ensure the accuracy of the aspirated liquid volume, a guide groove is provided on the upper side of the push rod 4, which is aligned with its length direction, and a guide block 14 is fixed to the inner surface of the right end of the syringe 1, which is inserted into the guide groove.

[0021] In order to facilitate the positioning post 8 to be dislodged from the positioning groove 6 when squeezed by the side wall of the positioning groove 6, the free end of the positioning post 8 is a hemispherical surface, and the positioning post 8 is connected to the inner bottom surface of the slide cylinder 7 by a spring 15.

[0022] The multiple scale values ​​mentioned are 1ml, 2ml, 3ml, 4ml, and 5ml from left to right.

[0023] To facilitate the rotation of the ring 11, multiple anti-slip grooves are provided on the outer surface of the ring 11.

[0024] In use, the device and needle are packaged in a disposable plastic bag, making it a single-use item. The inclined surface of the arc-shaped block 12 contacts the outer end of the slide cylinder 7, the positioning column 8 is not inserted into the positioning groove 6, and the piston 3 is in the initial state of the leftmost position of the syringe 1. When the patient's infusion is completed and the indwelling needle needs to be flushed and sealed, the medical staff opens the packaging bag, takes out the device, inserts the needle into the saline solution, and pulls the push plate 5 to the right. The push plate 5 drives the piston 3 to move to the right via the push rod 4, gradually drawing the saline solution into the syringe 1. At the same time, the guide block 14 slides in the guide groove. When the push rod 4 moves to the right until the slide cylinder 7 contacts the baffle 9, 5ml of saline solution is accurately drawn into the syringe 1. The medical staff stops pulling the push plate 5, pulls the needle out of the saline solution, and removes the needle from the nipple.

[0025] Medical staff rotate ring 11 clockwise (refer to the attached diagram in the instruction manual). Figure 3The ring 11 drives the two arc blocks 12 to rotate clockwise. The inclined surfaces of the two arc blocks 12 simultaneously press the ends of the corresponding slide cylinders 7, causing the slide cylinders 7 to drive the spring 15 to push the positioning pin 8 toward the push rod 4. The compression spring 10 is compressed. When the ring 11 drives the arc blocks 12 to rotate to the notch 13, the outer end of the slide cylinder 7 is inserted into the notch 13 under the action of the compression spring 10. The position of the slide cylinder 7 is fixed, and the arc blocks 12 can no longer rotate. At this time, the positioning pin 8 is inserted into the positioning groove 6.

[0026] Insert the nipple into the indwelling needle connector. The medical staff pushes the push plate 5 to the left. The push plate 5 drives the push rod 4 to move to the left. The side wall of the positioning groove 6 squeezes the positioning post 8, causing the positioning post 8 to move towards the slide cylinder 7 and squeeze the spring 15. When the positioning post 8 is dislodged from the positioning groove 6, the push rod 4 drives the piston 3 to move to the left, allowing the liquid in the syringe 1 to flow into the indwelling needle catheter. When the push rod 4 moves to the left to the distance between the two positioning grooves 6, 1 ml of liquid is pushed out. At this time, the positioning post 8 is inserted into the corresponding positioning groove 6 under the action of the spring 15, and the push rod 4 stops. Similarly, continue to push to the left to achieve a pause after each 1 ml of liquid is pushed out. The operation is simple, does not require the medical staff to observe the scale value on the syringe 1, and also prevents the piston 3 from being pushed back due to high pressure in the blood vessel, which could cause backflow of blood.

Claims

1. A syringe comprising a right opening needle cylinder (1), the outer surface of the needle cylinder (1) is provided with a plurality of scale lines distributed along the length direction thereof, the left end of the needle cylinder (1) is communicated with a nipple, and the right end of the needle cylinder (1) is fixed with a waist type plate (2), characterized in that, The needle cylinder (1) is slidably connected with a piston (3), the piston (3) is fixed with a cross-shaped push rod (4) on the right side, the push rod (4) extends out of the needle cylinder (1) and is fixed with a push plate (5) on the right end, a plurality of positioning grooves (6) are formed on the front and back sides of the push rod (4) and are distributed along the left and right directions, the distance between every two adjacent positioning grooves (6) is equal to the distance between every two adjacent scale lines, the needle cylinder (1) is provided with a slide cylinder (7) which can move forward and backward and has an opening facing the push rod (4) on the right side of the front and back ends, the slide cylinder (7) is slidably connected with a positioning column (8), the inner end of the positioning column (8) can be inserted into the corresponding positioning groove (6).

2. A syringe according to claim 1, wherein The distance between the left end face of the piston (3) and the adjacent positioning groove (6) is equal to the distance between every two adjacent scale lines, the push rod (4) is fixed with a baffle (9) on the front and back sides, the right end face of the baffle (9) is flush with the left side face of the leftmost positioning groove (6), and the right end face of the baffle (9) can be in contact with the left side of the slide cylinder (7).

3. The syringe of claim 1, wherein The needle cylinder (1) is provided with a slide groove which is through from the inside to the outside on the front and back sides, the slide cylinder (7) is cross-shaped, the inner end of the slide cylinder (7) is inserted into the slide groove and is located between the needle cylinder (1) and the push rod (4), the stepped face of the slide cylinder (7) is connected with the outer surface of the needle cylinder (1) through a compression spring (10), the waist-shaped plate (2) is rotatably connected with a ring (11) on the left side, the inner surface of the ring (11) is fixed with two arc-shaped blocks (12) which are centrally symmetrically distributed, the end of the arc-shaped block (12) close to the slide cylinder (7) is an inclined face, and a notch (13) is formed in the arc-shaped block (12).

4. The syringe of claim 1, wherein The push rod (4) is provided with a guide groove which is consistent with the length direction of the push rod (4) on the upper side, and the inner surface of the right end of the needle cylinder (1) is fixed with a guide block (14) which is inserted into the guide groove.

5. The syringe of claim 1, wherein The free end of the positioning column (8) is a hemispherical face, and the positioning column (8) is connected with the inner bottom face of the slide cylinder (7) through a spring (15).

6. The syringe of claim 1, wherein The scale lines are 1ml, 2ml, 3ml, 4ml and 5ml from left to right.

7. The syringe of claim 3, wherein The outer surface of the ring (11) is provided with a plurality of anti-skid grooves.

Images