Prefilled pulse injectors

Abstract

The present invention relates to the field of syringe technology, in particular to a pre-filled pulse syringe. It comprises a syringe and a piston push rod, the front end of the piston push rod is connected to the piston, one end of the piston can be sealed and connected to the inner cavity of the syringe and can slide back and forth along the inner cavity of the syringe, a push plate is provided at the rear end of the piston push rod, the piston push rod has a plurality of push rod edges, the upper end surfaces of the plurality of push rod edges are continuously provided with a plurality of protruding elastic teeth, the tooth tips of the elastic teeth are arranged toward the rear end of the piston push rod and are inclined upward. The elastic teeth and the blocking ring of the present invention cooperate with each other to realize the function of pulse injection, maintain the stability and smoothness of the injection, and avoid the influence of human factors on the injection; the limiting ring plate can form a limit on the position where the piston push rod enters the inner cavity of the syringe, thereby realizing the function of retaining liquid in the syringe.

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, in particular to a pre-filled pulse syringe. Background Art

[0002] Vascular catheters are commonly used in clinical infusions, and strict requirements and standards apply to flushing the catheter before and sealing it afterward. Using a standard syringe relies entirely on operator control, which can be prone to errors and lacks the ability to ensure rigorous compliance throughout the entire process. This poses serious risks, such as drug reactions and embolism.

[0003] The positive pressure pulse flushing syringe for vascular access with patent number CN201320039110.X aims to avoid risks and solve the above problems from the perspective of the instrument, but its structure is still incomplete. There are defects such as the hard contact between the wavy teeth of the piston push rod and the blocking convex ring, which leads to insufficient operational stability and smoothness. Summary of the Invention

[0004] In response to the shortcomings of the above-mentioned existing production technology, the present application provides a pre-filled pulse syringe, in which the elastic teeth and the blocking ring cooperate with each other to achieve the function of pulse injection, maintain the stability and smoothness of the injection, and avoid the influence of human factors on the injection.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A pre-filled pulse syringe comprises a syringe and a piston push rod, the front end of the piston push rod is connected to the piston, one end of the piston can be sealed and connected to the inner cavity of the syringe and can slide back and forth along the inner cavity of the syringe, a push plate is provided at the rear end of the piston push rod, the piston push rod has a plurality of push rod edges, the upper end surfaces of the plurality of push rod edges are continuously provided with a plurality of protruding elastic teeth, the tooth tips of the elastic teeth are arranged toward the rear end of the piston push rod and are inclined upward; a circle of protruding blocking rings is provided in the inner cavity of the syringe along the circumferential direction, the blocking rings are located at the rear end of the syringe, the blocking rings form resistance to the elastic teeth they contact, and when the piston push rod is pushed hard, the elastic teeth can be deformed downward under the obstruction of the blocking ring, so that the elastic teeth can pass through the protruding blocking ring and enter the inner cavity of the syringe.

[0007] Furthermore, the plurality of push rod edges are distributed equidistantly along the circumference of the piston push rod.

[0008] Furthermore, the surface of the blocking ring is an arc end face, and the front and rear ends of the blocking ring are flush with the inner cavity surface of the injection barrel.

[0009] Furthermore, a tooth accommodating groove is provided between the roots of two adjacent elastic teeth, and the elastic tooth can enter the tooth accommodating groove after being compressed and deformed.

[0010] Furthermore, a radially protruding limiting ring plate is provided on the piston push rod, and the limiting ring plate is located at the tail end of the elastic tooth.

[0011] Furthermore, a plurality of retraction grooves are provided on the blocking ring, and the distribution positions of the plurality of retraction grooves can correspond one-to-one with the distribution positions of the plurality of push rod edges of the piston push rod, and the plurality of push rod edges of the piston push rod can move back and forth in the plurality of retraction grooves respectively.

[0012] Furthermore, there is a positive pressure functional end surface with a smooth transition between the limiting ring plate and the elastic teeth.

[0013] The beneficial effects of the present invention are as follows:

[0014] The elastic teeth and the blocking ring of the present invention cooperate with each other to realize the function of pulse injection, maintain the stability and smoothness of the injection, and avoid the influence of human factors on the injection; the limiting ring plate can limit the position of the piston push rod entering the inner cavity of the injection barrel, realizing the function of retaining liquid in the injection barrel; the positive pressure function end face can realize the positive pressure sealing of the tube after pulse flushing, so that blood cannot flow back into the injection barrel; the push rod edge of the piston push rod can move back and forth in the withdrawal groove to realize the withdrawal action of the piston push rod, so that it can be used for temporary liquid extraction when it is not pre-installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the front view of the present invention.

[0016] Figure 2 for Figure 1 Middle AA section view.

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0018] Figure 4 It is a side view of the syringe of the present invention.

[0019] Among them: 1. Injection barrel; 2. Piston push rod; 3. Push rod edge plate; 4. Elastic tooth; 5. Tooth accommodating groove; 6. Limiting ring plate; 7. Blocking ring; 8. Piston; 9. Push plate; 10. Retraction groove; 11. Positive pressure functional end face. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 2As shown, a prefilled pulse injector includes a syringe 1 and a piston push rod 2. The front end of the piston push rod 2 is connected to a piston 8. One end of the piston 8 can be sealed and connected to the inner cavity of the syringe 1 and can slide back and forth along the inner cavity of the syringe 1. A push plate 9 is provided at the rear end of the piston push rod 2, which allows the operator to quickly and easily push the piston push rod 2.

[0022] like Figure 1 and Figure 2 As shown, the piston push rod 2 has four push rod edges 3, which are evenly spaced along the circumference of the piston push rod 2. A plurality of protruding elastic teeth 4 are continuously arranged on the upper end surfaces of the four push rod edges 3. The tips of the elastic teeth 4 are tilted upward, with the tips facing the rear end of the piston push rod 2. The number and spacing of the elastic teeth 4 are related to the pulse frequency and the amount of liquid being flushed. The height and elasticity of the elastic teeth 4 are related to the force required to push the push rod.

[0023] like Figure 2 and Figure 3 As shown, a circle of raised blocking rings 7 are provided along the circumferential direction of the inner cavity of the syringe 1. The blocking ring 7 is located at the rear end of the syringe 1, and a distance is maintained between the blocking ring 7 and the opening at the rear end of the syringe 1. This distance allows the piston push rod 2 to have a space for being withdrawn, and will not fall out of the inner cavity of the syringe 1 during the withdrawal operation. The blocking ring 7 forms a resistance to the elastic teeth 4 that it contacts. When the piston push rod 2 is pushed hard, the elastic teeth 4 can be deformed downward under the obstruction of the blocking ring 7, so that the elastic teeth 4 can pass through the protruding blocking ring 7 and enter the inner cavity of the syringe 1. According to this working principle, a pulse injection effect is formed.

[0024] like Figure 3 As shown, the surface of the blocking ring 7 is an arc end face, and the front and rear ends of the blocking ring 7 are flush with the inner cavity surface of the injection barrel 1. The elastic teeth 4 and the surface of the blocking ring 7 can be more smoothly in contact, and will not cause tooth breakage or jamming due to excessive or insufficient resistance.

[0025] like Figure 2 and Figure 3 As shown, a tooth accommodating groove 5 is provided between the roots of two adjacent elastic teeth 4. After being compressed and deformed, the elastic teeth 4 can enter the tooth accommodating groove 5, thereby preventing the elastic teeth 4 from being stuck at the blocking ring 7 position.

[0026] like Figure 2 and Figure 3 As shown, a radially protruding limit ring plate 6 is provided on the piston push rod 2, and the limit ring plate 6 is located at the tail end of the elastic tooth 4. The limit ring plate 6 can limit the position of the piston push rod 2 entering the inner cavity of the syringe 1, and retain a section of about 0.5 ml of injection liquid in the inner cavity of the syringe 1. Through the retained injection liquid, the actual state after the tube is sealed and clamped can be intuitively observed.

[0027] like Figure 2 and Figure 3 As shown, there is a positive pressure functional end face 11 with a smooth transition between the limiting ring plate 6 and the elastic tooth 4. The length of the positive pressure functional end face 11 corresponds to a liquid volume of about 1.5 ml in the syringe 1. Through this positive pressure functional end face 11, positive pressure sealing of the tube can be achieved after pulse flushing, so that blood cannot flow back into the syringe 1.

[0028] like Figure 4 As shown, four withdrawal grooves 10 are provided on the blocking ring 7, and the distribution positions of the four withdrawal grooves 10 can correspond one-to-one to the distribution positions of the four push rod edges 3 of the piston push rod 2. When the piston push rod 2 is rotated to the corresponding position, the four push rod edges 3 of the piston push rod 2 can move back and forth in the four withdrawal grooves 10 respectively, realizing the withdrawal action of the piston push rod 2, so that temporary liquid extraction can be used when it is not in a pre-installed state.

[0029] The working principle of the present invention is as follows: when the present invention is in use, physiological saline is pre-installed in the syringe 1, and the operator applies an external force to push the piston push rod 2. Under the action of the external force, the elastic tooth 4 can overcome the obstruction of the blocking ring 7 and enter the inner cavity of the syringe 1. Each time an elastic tooth 4 is pushed forward, a pulse injection is achieved, so that the present invention has the function of pulse injection, maintains the stability of the injection, and avoids the influence of human factors. The limiting ring plate 6 can form a limit on the position where the piston push rod 2 enters the inner cavity of the syringe 1, so that about 0.5 ml of liquid can be left in the syringe 1, realizing the liquid retention function in the syringe 1. The positive pressure function end face 11 can realize the positive pressure tube sealing after pulse flushing.

[0030] The working process of the present invention when applied to the sealing tube of the indwelling needle is as follows:

[0031] 1. Pre-equipped state: The syringe 1 is pre-filled with physiological saline, the piston push rod 2 is in the inner cavity of the syringe 1, and the first elastic tooth 4 is located on the syringe inlet side of the blocking ring 7. When withdrawing, it will not affect the withdrawal of the piston push rod 2;

[0032] 2. It is necessary to combine the A-C-L steps of the indwelling needle sealing tube operation standard:

[0033] (1) A (assess): Assess the patient's blood vessels and skin conditions at the indwelling needle site. After connecting the present invention, first draw blood back to evaluate the catheter function and observe whether there is blood back. If there is blood back, proceed to the next step; (2) C (clear): First slowly push a small amount of normal saline. If there is no resistance when pushing, use the pulse method to flush the tube; (3) L (lock): Retract the needle into the heparin cap and push the sealing liquid in a pulsed manner (enter the pulse function). When 1.5 ml of normal saline remains, push the sealing liquid while removing the needle to ensure positive pressure sealing (enter the positive pressure function). About 0.5 ml of liquid remains in the syringe 1 (liquid retention function); (4) Close the small clip of the indwelling needle: While sealing the tube with positive pressure, move the small clip to the Y-shaped interface with your left hand. When the tube sealing is completed, clamp the small clip. After observing that there is no blood back in the needle tube, remove the syringe.

[0034] 3. When connecting the infusion, after AC steps, you can connect the infusion tube for infusion:

[0035] (1) A (assess): Assess the patient's blood vessels and skin conditions at the catheter site. After connecting the present invention, first draw blood back to evaluate the catheter function and observe whether there is blood return. If there is blood return, proceed to the next step; (2) C (clear): First slowly try to push a small amount of normal saline. If there is no resistance when pushing, use a pulse method to flush the catheter.

[0036] The present invention can get rid of the dependence of the pulse, positive pressure and liquid retention operations of the indwelling needle sealing tube on the operator's skills and sense of responsibility in actual clinical operation, and provide a stable and reliable operation guarantee.

[0037] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any modifications may be made within the scope of protection of the present invention.

Claims

1. A prefilled pulse injector, comprising a syringe (1) and a piston push rod (2), wherein the front end of the piston push rod (2) is connected to a piston (8), one end of the piston (8) can be sealed and connected to the inner cavity of the syringe (1) and can slide back and forth along the inner cavity of the syringe (1), and a push plate (9) is provided at the rear end of the piston push rod (2), characterized in that: The piston push rod (2) has a plurality of push rod edges (3), and the upper end surfaces of the plurality of push rod edges (3) are continuously provided with a plurality of protruding elastic teeth (4), and the tooth tips of the elastic teeth (4) are directed toward the rear end of the piston push rod (2) and are arranged obliquely upward; the inner cavity of the injection barrel (1) is provided with a circle of protruding blocking rings (7) along the circumferential direction, and the blocking rings (7) are located at the rear end of the injection barrel (1), and the blocking rings (7) form resistance to the elastic teeth (4) in contact with the blocking rings (7). When the piston push rod (2) is pushed with force, the elastic teeth (4) can be deformed downward under the blocking of the blocking rings (7), so that the elastic teeth (4) can enter the inner cavity of the injection barrel (1) through the protruding blocking rings (7); a tooth accommodating groove (5) is provided between the roots of two adjacent elastic teeth (4), and the elastic teeth (4) can enter the tooth accommodating groove (5) after being deformed under pressure; A plurality of retraction grooves (10) are provided on the blocking ring (7), and the distribution positions of the plurality of retraction grooves (10) can correspond one-to-one with the distribution positions of the plurality of push rod edges (3) of the piston push rod (2), and the plurality of push rod edges (3) of the piston push rod (2) can respectively move forward and backward in the plurality of retraction grooves (10).

2. The prefilled pulse injector according to claim 1, wherein: The plurality of push rod edges (3) are distributed equidistantly along the circumferential direction of the piston push rod (2).

3. The prefilled pulse injector according to claim 2, wherein: The surface of the blocking ring (7) is an arc end face, and the front and rear ends of the blocking ring (7) are flush with the inner cavity surface of the injection barrel (1).

4. The prefilled pulse injector according to claim 3, wherein: A radially protruding limiting ring plate (6) is provided on the piston push rod (2), and the limiting ring plate (6) is located at the tail end of the elastic tooth (4).

5. The prefilled pulse injector according to claim 4, wherein: A positive pressure functional end surface (11) with a smooth transition is provided between the limiting ring plate (6) and the elastic warping teeth (4).

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