Sodium citrate pre-filled anticoagulant injector and use method

Abstract

The invention discloses a sodium citrate pre-filled anticoagulant injector and a using method, and relates to the technical field of medical supplies, the sodium citrate pre-filled anticoagulant injector comprises an injection tube and a push rod, the injection tube is filled with a saline solution and a sealing bag, the sealing bag is arranged close to the push rod, the sealing bag is filled with sodium citrate tube sealing liquid, and a pricking needle is arranged at the top in the injection tube. A peripheral channel is arranged on one side of the pricking needle and communicated with the injection head. The sodium citrate pre-filled anticoagulant injector provided by the invention is simple in structure, easy to assemble and relatively low in production cost, and solves the problem that the traditional operation of flushing and sealing a tube through a plurality of injectors is tedious.

Description

Technical Field

[0001] The invention relates to the technical field of medical supplies, and in particular to a sodium citrate prefilled anticoagulant syringe. Background Art

[0002] Central venous catheters are widely used in intravenous treatment, fluid replacement and hemodialysis. If they are not properly cared for, they will lead to complications such as catheter-related bloodstream infection and catheter blockage. Among them, catheter blockage is the most common. Once it occurs, intra-catheter thrombolysis, catheter removal or re-catheterization is required. It will not only lead to treatment interruption, increase patient hospitalization time and medical expenses, but also affect patient prognosis and even increase mortality. In routine clinical operations, sealing the central venous catheter is a key link to extend its use time and reduce complications. Prefilled syringes are commonly used medical devices. They generally include a sleeve, a piston, a cap and a push rod. The piston and the push rod are connected together and installed in the sleeve. The solution pre-filled in the sleeve is pushed out of the syringe by pushing the push rod and then the piston. Prefilled syringes are suitable for sealing indwelling catheters or indwelling needles in the intervals between different drug treatments.

[0003] During the retention period of the vascular indwelling catheter, the tube needs to be flushed and sealed after each infusion or medication to prevent blood from flowing back and forming thrombi during sealing, which may lead to blockage of the vascular indwelling tube. Sodium citrate is used as a sealing fluid for CVC sealing. Sodium citrate liquid is widely used as a sealing fluid for indwelling catheters or indwelling needles, which can prevent thrombosis and infection.

[0004] To this end, the present invention proposes a sodium citrate prefilled anticoagulant syringe, which solves the problem of cumbersome traditional tube flushing and tube sealing operations using multiple syringes. Summary of the invention

[0005] The purpose of the present invention is to solve the defects in the prior art and to provide a sodium citrate prefilled anticoagulant syringe.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A sodium citrate prefilled anticoagulant syringe comprises an injection tube and a push rod. The injection tube is provided with a saline solution and a sealing capsule, the sealing capsule is arranged adjacent to the push rod and is filled with sodium citrate tube-sealing liquid. A puncture needle is arranged at the top of the injection tube, a peripheral channel is arranged on one side of the puncture needle, and the peripheral channel is connected to the injection head.

[0008] Furthermore, the needles are arranged in a circular array in groups with the injection head as the center, and the peripheral channels are arranged corresponding to the needles and are located on the side of the needles away from the injection head.

[0009] Furthermore, the push rod is a two-section structure, including a push rod outer frame section and a push rod telescopic section. A sliding cavity is provided in the push rod outer frame section, and the push rod telescopic section is slidably connected to the sliding cavity. A plurality of limiting holes are opened on the sliding cavity, and the push rod telescopic section is provided with a second limiting wedge block, and the second limiting wedge block is unidirectionally slidably connected to the limiting hole; the push rod outer frame section is provided with a first limiting wedge block, and the first limiting wedge block is unidirectionally slidably connected to the limiting cover, and the limiting cover is provided at the end of the injection tube.

[0010] Furthermore, the cross-sections of the push rod outer frame section and the push rod telescopic section are both cross-shaped, and a cross-shaped through-opening is provided on the limit cover, which is adapted to the outer contour of the push rod outer frame section, and the first limit wedge block is used to limit the inner sliding state of the push rod outer frame section in the through-opening.

[0011] Furthermore, the limiting cover is also provided with a reset hole, which is an arc-shaped hole and is located at one side of the through-hole, and the reset hole corresponds to the first limiting wedge block.

[0012] Furthermore, a locking frame is fixedly connected to the end of the telescopic section of the push rod, the locking frame has the same structure as the outer frame section of the push rod, and a third limiting wedge is fixedly connected to the outer wall of the locking frame.

[0013] Furthermore, two groups of the second limiting wedge blocks are provided, and the spacing between the two groups of limiting wedge blocks is the same as the spacing between the two limiting holes. 2-4 groups of the first limiting wedge blocks are provided, and the spacing between adjacent first limiting wedge blocks is 3-5 mm.

[0014] Furthermore, a groove is provided on the piston at the end of the push rod, the volume of the groove is larger than the volume of the puncture needle and corresponds to the puncture needle.

[0015] A method for using a sodium citrate prefilled anticoagulant syringe utilizes the above-mentioned sodium citrate prefilled anticoagulant syringe and comprises the following steps:

[0016] S1: Press the end of the telescopic end of the push rod downward to push the liquid out slowly;

[0017] S2: After the first limiting wedge reaches the other side of the limiting cover, stop pushing and pull out the telescopic section of the push rod;

[0018] S3: Pull the second limiting wedge block on the telescopic section of the push rod into the outermost limiting hole, and make the straight surface of the second limiting wedge block abut against the inner wall of the limiting hole;

[0019] S4: Finally, push the telescopic section of the push rod to perform the subsequent fluid pushing action.

[0020] Beneficial Effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The invention has a simple structure, is easy to assemble, and has a low production cost. A puncture needle is arranged in the syringe barrel of the syringe body. One end of the puncture needle is a sharp end for correspondingly puncturing the sodium citrate sealing capsule, and the other end is an open structure. The open end of the puncture needle is fixedly connected to the inner wall of the injection tube. By arranging a peripheral channel around the puncture needle and coordinating the structure of the injection head, it can be ensured that the liquid in the sealing capsule can be directly discharged from the needle tube through the injection head or the peripheral channel. The material of the sodium citrate sealing capsule is medical rubber with shrinkage elasticity, that is, the sodium citrate sealing capsule can shrink rapidly at the moment of being punctured by the puncture needle, and the sodium citrate can be discharged. The operation is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0024] Figure 1 Schematic diagram of the internal structure of the syringe.

[0025] Figure 2 Schematic diagram of the structure of the push rod.

[0026] Figure 3 It is a schematic diagram of the structure of the limit cover.

[0027] Figure 4 This is a schematic diagram of the enlarged structure of part A.

[0028] Figure 5 This is a schematic diagram of the enlarged structure of part B.

[0029] In the figure: 1. injection tube; 2. sealing capsule; 3. push rod outer frame section; 4. first limiting wedge block; 5. push rod telescopic section; 6. locking frame; 7. limiting cover; 8. peripheral channel; 9. puncture needle; 10. second limiting wedge block. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In addition, in the description of this application, the terms used should be understood in a broad sense, and for those skilled in the art, the specific meanings of the terms can be understood according to the actual specific circumstances. For example, the term "installation" used in this application can be defined as a detachable fixed installation or a non-detachable fixed installation, etc.; the terms "setting" and "provided with" used can be defined as a contact setting or a non-contact setting, etc.; the terms "connection" and "connected" used can be defined as a fixed connection or a movable connection, etc.; the term "matching" used can be defined as the same or similar in shape or size, etc.; the directional terms used are all based on the drawings as a reference or the directions defined according to the actual situation and common knowledge.

[0035] Reference Figure 1 - Figure 5A sodium citrate prefilled anticoagulant syringe comprises an injection tube 1 and a push rod. The injection tube 1 is provided with a saline solution and a sealing capsule 2. The sealing capsule 2 is provided near the push rod and is filled with sodium citrate tube-sealing solution. A puncture needle 9 is provided at the top of the injection tube 1. A peripheral channel 8 is provided on one side of the puncture needle 9. The peripheral channel 8 is connected to the injection head.

[0036] The invention has a simple structure, is easy to assemble, and has a low production cost. A puncture needle 9 is arranged in the syringe body. One end of the puncture needle 9 is a sharp end for correspondingly puncturing the sodium citrate sealing capsule 2, and the other end is an open structure. The open end of the puncture needle 9 is fixedly connected to the inner wall of the injection tube. By arranging a peripheral channel 8 around the puncture needle 9 and coordinating the structure of the injection head, it can be ensured that the liquid in the sealing capsule 2 can be directly discharged from the needle tube through the injection head or the peripheral channel 8. The material of the sodium citrate sealing capsule 2 is medical rubber with shrinkage elasticity, that is, the sodium citrate sealing capsule 2 can shrink rapidly at the moment of being punctured by the puncture needle 9, and the sodium citrate can be discharged. The operation is simple and efficient.

[0037] In other preferred embodiments, the needles 9 are multiple groups arranged in a circular array with the injection head as the center, and the peripheral channels 8 are arranged corresponding to the needles 9 and located on the side of the needles 9 away from the injection head. By arranging the peripheral channels 8 on the periphery of the needles 9, the needles 9 can be used to fix the sealing capsule 2, forming a two-way liquid discharge mode of the injection head and the peripheral channels 8, so as to reduce the influence of the blockage of the sealing capsule 2 on the liquid discharge.

[0038] In other preferred embodiments, the push rod is a two-section structure, including a push rod outer frame section 3 and a push rod telescopic section 5. A sliding cavity is provided in the push rod outer frame section 3, and the push rod telescopic section 5 is slidably connected in the sliding cavity. A plurality of limiting holes are provided on the sliding cavity, and the push rod telescopic section 5 is provided with a second limiting wedge block 10, which is unidirectionally slidably connected in the limiting hole; the push rod outer frame section 3 is provided with a first limiting wedge block 4, which is unidirectionally slidably connected to the limiting cover 7, and the limiting cover 7 is provided at the end of the injection tube 1.

[0039] The push rod is set to have a structure of a push rod outer frame section 3 and a push rod telescopic section 5, which can ensure stability during the initial liquid pushing. When in use, the push rod telescopic section 5 is embedded in the push rod outer frame, and the second limiting wedge block 10 is located in the limiting hole therein. The operator presses the end of the telescopic end of the push rod to press the push rod downward to push the liquid out. After the first limiting wedge block 4 reaches the other side of the limiting cover 7, the operator pulls out the push rod telescopic section 5. During the pulling out process, the straight surface of the first limiting wedge block 4 is clamped on the end surface of the limiting cover 7, which can prevent the push rod outer frame section 3 from moving. The second limiting wedge block 10 on the push rod telescopic section 5 is pulled into the outermost limiting hole, and the straight surface of the second limiting wedge block 10 is against the inner wall of the limiting hole, and then the liquid pushing action is performed.

[0040] Specifically, the cross-sections of the push rod outer frame section 3 and the push rod telescopic section 5 are both cross-shaped, and a cross-shaped through-opening is opened on the limit cover 7, which is adapted to the outer contour of the push rod outer frame section 3, and the first limit wedge block 4 is used to limit the push rod outer frame section 3 from sliding inside the through-opening.

[0041] The limit cover 7 is also provided with a reset hole, which is an arc-shaped hole and is located on one side of the through hole, and the reset hole corresponds to the first limit wedge 4. By providing the reset hole, the first limit wedge 4 can be ensured to pass through the limit cover 7 more smoothly.

[0042] In other preferred embodiments, a locking frame 6 is fixedly connected to the end of the push rod telescopic section 5, and the locking frame 6 has the same structure as the push rod outer frame section 3, and a third limiting wedge is fixedly connected to the outer wall of the locking frame 6. By providing the locking frame 6 and the third limiting wedge, it can be ensured that after the end of the push rod abuts against the end wall of the injection tube 1, the straight surface of the third limiting wedge can abut against the end surface of the limiting cover 7, thereby preventing the push rod from rebounding outwards.

[0043] Specifically, two groups of second limiting wedge blocks 10 are provided, and the spacing between the two groups of limiting wedge blocks is the same as the spacing between the two limiting holes. Two to four groups of first limiting wedge blocks 4 are provided, and the spacing between adjacent first limiting wedge blocks 4 is 3-5 mm.

[0044] In other preferred embodiments, a groove is provided on the piston at the end of the push rod, the volume of the groove is larger than the volume of the puncture needle 9, and corresponds to the puncture needle 9. This structure can ensure that the end of the inserted piston head close to the puncture needle 9 is provided with a groove that can allow the puncture needle 9 to be inserted, that is, the piston of the syringe body can be in contact with the end of the syringe body barrel close to the needle head, so that the saline solution and sodium citrate can be completely squeezed out.

[0045] A method for using a sodium citrate prefilled anticoagulant syringe utilizes the above-mentioned sodium citrate prefilled anticoagulant syringe and comprises the following steps:

[0046] S1: Press the end of the telescopic end of the push rod downward to push the liquid out slowly;

[0047] S2: After the first limiting wedge reaches the other side of the limiting cover, stop pushing and pull out the telescopic section of the push rod;

[0048] S3: Pull the second limiting wedge block on the telescopic section of the push rod into the outermost limiting hole, and make the straight surface of the second limiting wedge block abut against the inner wall of the limiting hole;

[0049] S4: Finally, push the telescopic section of the push rod to perform the subsequent fluid pushing action.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sodium citrate prefilled anticoagulant syringe, characterized in that: It comprises an injection tube and a push rod. The injection tube is provided with a saline solution and a sealing capsule. The sealing capsule is provided near the push rod and is filled with sodium citrate tube-sealing liquid. A puncture needle is provided at the top of the injection tube. A peripheral channel is provided on one side of the puncture needle. The peripheral channel is connected to the injection head.

2. A sodium citrate prefilled anticoagulant syringe according to claim 1, characterized in that: The needles are arranged in a circular array in groups with the injection head as the center. The peripheral channels are arranged corresponding to the needles and are located on the side of the needles away from the injection head.

3. A sodium citrate prefilled anticoagulant syringe according to claim 1, characterized in that: The push rod is a two-section structure, including a push rod outer frame section and a push rod telescopic section. A sliding cavity is provided in the push rod outer frame section, and the push rod telescopic section is slidably connected to the sliding cavity. A plurality of limiting holes are opened on the sliding cavity. The push rod telescopic section is provided with a second limiting wedge block, and the second limiting wedge block is unidirectionally slidably connected to the limiting hole; the push rod outer frame section is provided with a first limiting wedge block, and the first limiting wedge block is unidirectionally slidably connected to the limiting cover, and the limiting cover is provided at the end of the injection tube.

4. A sodium citrate prefilled anticoagulant syringe according to claim 3, characterized in that: The cross-sections of the push rod outer frame section and the push rod telescopic section are both cross-shaped, and the limit cover is provided with a cross-shaped through-opening, which is adapted to the outer contour of the push rod outer frame section, and the first limit wedge block is used to limit the push rod outer frame section from sliding inside the through-opening.

5. A sodium citrate prefilled anticoagulant syringe according to claim 4, characterized in that: The limit cover is also provided with a reset hole, which is an arc-shaped hole and is located at one side of the through opening. The reset hole corresponds to the first limit wedge block.

6. A sodium citrate prefilled anticoagulant syringe according to claim 3, characterized in that: A locking frame is fixedly connected to the end of the telescopic section of the push rod. The locking frame has the same structure as the outer frame section of the push rod. A third limiting wedge is fixedly connected to the outer wall of the locking frame.

7. The sodium citrate prefilled anticoagulant syringe according to claim 3, characterized in that: The second limiting wedge blocks are provided in two groups, and the spacing between the two groups of limiting wedge blocks is the same as the spacing between the two limiting holes. The first limiting wedge blocks are provided in 2-4 groups, and the spacing between adjacent first limiting wedge blocks is 3-5 mm.

8. The sodium citrate prefilled anticoagulant syringe according to claim 1, characterized in that: A groove is provided on the piston at the end of the push rod. The volume of the groove is larger than the volume of the pricking needle and corresponds to the pricking needle.

9. A method for using a sodium citrate prefilled anticoagulant syringe, characterized in that: A sodium citrate prefilled anticoagulant syringe according to any one of claims 3 to 7 is used, and comprises the following steps: S1: Press the end of the telescopic end of the push rod downward to push the liquid out slowly; S2: After the first limiting wedge reaches the other side of the limiting cover, stop pushing and pull out the telescopic section of the push rod; S3: Pull the second limiting wedge block on the telescopic section of the push rod into the outermost limiting hole, and make the straight surface of the second limiting wedge block abut against the inner wall of the limiting hole; S4: Finally, push the telescopic section of the push rod to perform the subsequent fluid pushing action.

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