High-pressure injector connecting device

Abstract

The utility model discloses a high-pressure injector connecting device which comprises a remaining needle and a heparin cap used for being connected with a high-pressure injector and further comprises a catheter and a one-way valve, the one-way valve comprises a one-way valve shell, and a conical petal structure which can only be unfolded in one direction is arranged in the one-way valve shell. A flow adjusting structure is further arranged between the one-way valve shell and the conical petal structure. The heparin cap, the one-way valve and the remaining needle are sequentially connected to the catheter. The high-pressure injector connecting device provided by the utility model not only can automatically prevent liquid from flowing back, but also has the capacity of adjusting flow, and is wide in applicability.

Description

Technical Field

[0001] This utility model relates to the field of contrast imaging, and in particular to a high-pressure injector connection device. Background Technology

[0002] High-pressure injectors are widely used in clinical cardiovascular angiography, CT contrast-enhanced scanning, and MRI contrast-enhanced scanning for examination and treatment. Their main function is to inject contrast agents or saline into the body. Currently, indwelling needles are used in conjunction with high-pressure injectors. First, the puncture needle of the indwelling needle is inserted into the patient's body. Then, the heparin cap of the indwelling needle is connected to the high-pressure injector, and finally, the contrast agent is injected into the indwelling needle through the high-pressure injector. A flow-stopping clip is usually installed on the catheter between the heparin cap and the indwelling needle to prevent backflow of fluid or blood. Currently, using the flow-stopping clip requires manual operation to clamp the catheter, and when catheter patency is needed, the flow-stopping clip must be manually released, increasing the workload of medical staff. In addition to connecting to the high-pressure injector, the heparin cap of the indwelling needle may also be used to connect to containers of other medications or nutritional solutions. However, the indwelling needle cannot select the appropriate flow rate according to the patient's condition, resulting in poor versatility of the high-pressure injector connection devices currently on the market. Utility Model Content

[0003] The purpose of this invention is to provide a high-pressure injector connection device that can automatically prevent liquid backflow and has the ability to regulate flow rate, making it widely applicable.

[0004] To achieve the above objectives, this utility model provides a high-pressure injector connection device, including an indwelling needle and a heparin cap for connecting to a high-pressure injector, as well as a catheter and a one-way valve. The one-way valve includes a one-way valve housing, and a conical valve structure that can only be deployed in one direction is provided inside the one-way valve housing. A flow regulating structure is also provided between the one-way valve housing and the conical valve structure. The heparin cap, the one-way valve, and the indwelling needle are sequentially connected to the catheter.

[0005] As a further improvement of this utility model, the conical petal structure includes an annular base, and on the same side of the annular base are a plurality of isosceles triangular baffles arranged around its center line, the baffles together forming a cone shape, and the bottom edge of the baffles is connected to the annular base; the baffles are made of elastic material.

[0006] As a further improvement of this utility model, the one-way valve housing includes a first housing with a first inner cavity, one end of the first housing is connected to a first connecting pipe, and the first connecting pipe and the first housing are arranged sequentially along the liquid flow direction; the end of the annular base away from each baffle is connected to a splicing pipe communicating with it, the conical flap structure is located in the first inner cavity of the first housing, and the splicing pipe and the inner wall of the output end of the first connecting pipe are threadedly connected by a first thread structure.

[0007] As a further improvement of this utility model, the one-way valve housing also includes a second housing with a second inner cavity. One end of the second housing is connected to a second connecting pipe. The flow regulating structure includes an inner cylinder portion disposed at the other end of the second housing. The inner cylinder portion extends into the first inner cavity of the first housing. The second housing and the first housing are mutually telescopically sleeved together. An elastic ring is fixed on the inner sidewall of one end of the inner cylinder portion. The elastic ring surrounds the outer side of each baffle.

[0008] As a further improvement of this utility model, the second housing and the first housing are connected by a second threaded structure.

[0009] As a further improvement of this utility model, a sealing ring is provided between the outer wall of the inner cylinder and the inner wall of the first shell.

[0010] Beneficial effects

[0011] Compared with the prior art, the advantages of the high-pressure injector connection device of this utility model are:

[0012] 1. By installing a one-way valve on the conduit of the high-pressure injector connection device, liquid backflow can be prevented. At the same time, due to the use of a flow regulation structure, the flow rate of the drug can be adjusted according to the type of drug injected and the patient's physical condition, making it widely applicable.

[0013] 2. The check valve employs a conical flap structure, comprising multiple isosceles triangular baffles. When liquid flows forward through the conical flap structure, the liquid pressure overcomes the elastic force of the baffles, forcing them to open outwards, thus opening the check valve. When liquid flows backwards through the conical flap structure, the baffles close inwards under the combined action of their own elastic force and the liquid pressure, thus closing the check valve. This check valve has a simple structure and does not require a spring.

[0014] 3. When adjusting the flow rate of the check valve, rotate the first and second housings relative to each other. Utilizing the second threaded structure between them, the first and second housings move axially relative to each other. At this time, the elastic ring also moves axially relative to the conical valve structure. Because the baffles of the conical valve structure are arranged at an angle relative to the neutral line of the check valve, the position of the elastic ring on the outer side of the baffle, depending on the distance between the baffle and the elastic ring, can limit the maximum opening angle of the baffle, thereby limiting the flow rate of the check valve. When the baffles of the conical valve structure are still closed and the elastic ring has been pressed to the outer side of the baffle near the bottom edge, the elastic ring prevents the baffle from unfolding outwards through pressure, thus closing the check valve. The use of an elastic ring structure also avoids hard contact with the baffle, improving the durability of the baffle.

[0015] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the high-pressure injector connection device;

[0018] Figure 2 This is one of the cross-sectional views of a check valve;

[0019] Figure 3 This is the second cross-sectional view of a check valve;

[0020] Figure 4 This is the third cross-sectional view of a one-way valve;

[0021] Figure 5 This is a three-dimensional diagram of the cone-shaped lobe structure. Detailed Implementation

[0022] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0023] Example

[0024] The specific embodiments of this utility model are as follows: Figures 1 to 5 As shown, a high-pressure injector connection device includes an indwelling needle 4 and a heparin cap 1 for connection to the high-pressure injector. It also includes a catheter 2 and a one-way valve 3. The one-way valve 3 includes a one-way valve housing, within which a conical valve structure 33 that can only unfold in one direction is provided. A flow regulating structure is also provided between the one-way valve housing and the conical valve structure 33. The heparin cap 1, the one-way valve 3, and the indwelling needle 4 are sequentially connected to the catheter 2.

[0025] The conical petal structure 33 includes an annular base 332. On the same side of the annular base 332, multiple isosceles triangular baffles 331 are arranged around its center line, forming a cone shape. The base of each baffle 331 is connected to the annular base 332. Figure 5 As shown. The baffle 331 is made of an elastic material, such as a plastic sheet, which can bend to a certain extent under a certain external force, possessing a certain degree of elastic deformation capability. The tip of the conical flap structure 33 faces the same direction as the forward flow of the liquid.

[0026] The one-way valve housing includes a first housing 31 with a first inner cavity 311. One end of the first housing 31 is connected to a first connecting pipe 35. The first connecting pipe 35 and the first housing 31 are arranged sequentially along the liquid flow direction. The first connecting pipe 35 is connected to the output end of the conduit 2, specifically by a threaded connection. The end of the annular base 332 away from each baffle 331 is connected to a splicing pipe 34 that communicates with it. The conical valve structure 33 is located in the first inner cavity 311 of the first housing 31. The splicing pipe 34 and the inner wall of the output end of the first connecting pipe 35 are threaded together by a first threaded structure 6, which facilitates production and assembly.

[0027] The one-way valve housing also includes a second housing 32 with a second inner cavity 321. One end of the second housing 32 is connected to a second connecting pipe 36, and the output end of the second connecting pipe 36 is connected to the liquid input end of the indwelling needle 4. The flow regulating structure includes an inner cylinder 322 disposed at the other end of the second housing 32. The second housing 32 and the inner cylinder 322 are fixedly connected and communicate with each other. The inner cylinder 322 extends into the first inner cavity 311 of the first housing 31, and the second housing 32 and the first housing 31 are mutually telescopically fitted together. A sealing ring 38 is provided between the outer wall of the inner cylinder 322 and the inner wall of the first housing 31, which can improve the sealing performance between the second housing 32 and the first housing 31.

[0028] An elastic ring 37 is fixed on the inner wall of one end of the inner cylinder 322, and the elastic ring 37 surrounds the outer side of each baffle 331.

[0029] The second housing 32 and the first housing 31 are connected by a second threaded structure 5. The position of the elastic ring 37 relative to the conical flap structure 33 can be adjusted by manually turning the second housing 32 and the first housing 31.

[0030] The high-pressure injector connection device is inserted into the patient via the indwelling needle 4. When the liquid flows forward through the conical valve structure 33, the liquid pressure overcomes the elastic force of the baffles 331, forcing each baffle 331 to open outward, at which time the one-way valve 3 is open; when the liquid flows backward through the conical valve structure 33, each baffle 331 closes inward under the combined action of its own elastic force and the liquid pressure, at which time the one-way valve is closed.

[0031] When the flow rate of the one-way valve 3 needs to be adjusted, the first housing 31 and the second housing 32 are rotated relative to each other. The second threaded structure 5 between them causes the first and second housings to move axially relative to each other. At this time, the elastic ring 37 also moves axially relative to the conical valve structure 33. Since the baffles 331 of the conical valve structure 33 are arranged at an angle relative to the neutral line of the one-way valve 3, the elastic ring 37, at different positions outside the baffles 331, can limit the maximum opening angle of the baffles based on the distance between the baffles 331 and the elastic ring 37, thereby limiting the flow rate of the one-way valve. When the baffles 331 of the conical valve structure 33 are still closed and the elastic ring 37 has been pressed to the outer edge of the baffle near the bottom, the elastic ring 37 prevents the baffles 331 from unfolding outwards through pressure, thus closing the one-way valve 3. The structure of the elastic ring 37 also avoids hard contact with the baffles 331, improving the durability of the baffles.

[0032] Since the heparin cap 1 of the high-pressure injector connection device can be connected to other medicine bottles or nutrient solutions in addition to the high-pressure injector, although some high-pressure injectors have the function of adjusting the flow rate, the medicine bottles themselves do not have the function of adjusting the flow rate. Therefore, the flow rate adjustment structure of the high-pressure injector connection device in this solution can make the high-pressure injector connection device adaptable to different infusion scenarios, and has better versatility.

[0033] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A high-pressure injector connection device, comprising an indwelling needle (4) and a heparin cap (1) for connection with a high-pressure injector, characterized in that, It also includes a catheter (2) and a one-way valve (3). The one-way valve (3) includes a one-way valve housing. The one-way valve housing is provided with a conical valve structure (33) that can only be opened in one direction. A flow regulating structure is also provided between the one-way valve housing and the conical valve structure (33). The heparin cap (1), the one-way valve (3), and the indwelling needle (4) are connected to the catheter (2) in sequence.

2. The high-pressure injector connection device according to claim 1, characterized in that, The conical petal structure (33) includes an annular base (332). On the same side of the annular base (332), there are multiple isosceles triangular baffles (331) arranged around its center line. The baffles (331) are arranged together in a conical shape. The bottom edge of the baffles (331) is connected to the annular base (332). The baffles (331) are made of elastic material.

3. The high-pressure injector connection device according to claim 2, characterized in that, The one-way valve housing includes a first housing (31) with a first inner cavity (311), one end of the first housing (31) is connected to a first connecting pipe (35), and the first connecting pipe (35) and the first housing (31) are arranged sequentially along the liquid flow direction; the end of the annular base (332) away from each baffle (331) is connected to a splicing pipe (34) communicating with it, the conical flap structure (33) is located in the first inner cavity (311) of the first housing (31), and the splicing pipe (34) and the inner wall of the output end of the first connecting pipe (35) are threadedly connected by a first thread structure (6).

4. The high-pressure injector connection device according to claim 3, characterized in that, The one-way valve housing also includes a second housing (32) with a second inner cavity (321). One end of the second housing (32) is connected to a second connecting pipe (36). The flow regulating structure includes an inner cylinder (322) at the other end of the second housing (32). The inner cylinder (322) extends into the first inner cavity (311) of the first housing (31). The second housing (32) and the first housing (31) are mutually telescopically sleeved together. An elastic ring (37) is fixed on the inner sidewall of one end of the inner cylinder (322). The elastic ring (37) surrounds the outside of each baffle (331).

5. A high-pressure injector connection device according to claim 4, characterized in that, The second housing (32) is threadedly connected to the first housing (31) by a second threaded structure (5).

6. A high-pressure injector connection device according to claim 4, characterized in that, A sealing ring (38) is provided between the outer wall of the inner cylinder (322) and the inner wall of the first shell (31).

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