Medication injection structure under hemodialysis and method thereof

Abstract

The application discloses a medicine injection structure under hemodialysis and a method thereof, and relates to the technical field of medicine injection, which comprises a pipe sleeve body used for connecting an extracorporeal circulation system under hemodialysis; each group of medicine injection assemblies comprises a medicine adding end pipe communicated with the pipe sleeve body and a valve assembly arranged in the medicine adding end pipe; and a transmission sheet assembly and a handle piston column assembly are further arranged in and outside the medicine adding end pipe, and the handle piston column assembly acts on the end of the transmission sheet assembly. The application can be connected to the extracorporeal circulation system under hemodialysis, and is in a closed state in the process of not being used, and does not affect the treatment process of hemodialysis. When medicine treatment is needed, the valve assembly acts as an internal normally closed switch, and further actions of the transmission sheet assembly and the handle piston column assembly can realize different medicine adding modes, and the medicine adding modes can realize quantitative medicine adding and continuous medicine adding processes, and are safe and stable.

Description

Technical Field

[0001] This invention relates to the field of drug injection technology, specifically to a drug injection structure and method for hemodialysis. Background Technology

[0002] The medications needed for hemodialysis patients mainly include alkaline drugs, antihypertensive drugs, phosphate binders, vitamins, and iron supplements. Some of these medications are used during dialysis, effectively mixing with the blood and returning to the patient's body. The combination of medication and hemodialysis has a positive effect on patient treatment. However, the existing hemodialysis tubing and equipment still have certain drawbacks in achieving this. First, since hemodialysis is an extracorporeal circulation system, the blood is constantly flowing. When adding medication, the impact of opening the system must be considered, as it may cause blood to gush out. Secondly, regarding the method of drug injection, some drugs are administered as single-dose quantitative injections, while others are administered continuously and mixed with the blood to act on the patient. It is difficult to satisfy both simultaneously. Therefore, a drug injection structure and method under hemodialysis is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a drug injection structure and method for hemodialysis, which can be connected to the extracorporeal circulation system under hemodialysis. When not in use, it is in a closed state and does not affect the hemodialysis treatment process. When drug treatment is required, under the action of the valve assembly, it acts as an internal normally closed switch. With the further action of the transmission plate assembly and the handle piston column assembly, different drug injection methods can be realized. It can realize the quantitative injection and continuous injection of drugs respectively, which is safe and stable.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a drug injection structure for hemodialysis, comprising: a cannula for connection to an extracorporeal circulation system for hemodialysis; and a plurality of drug injection assemblies circumferentially distributed on the cannula; each set of drug injection assemblies includes a drug delivery tube communicating with the cannula, and a valve assembly disposed inside the drug delivery tube, serving as an internal normally closed switch for the drug injection assembly; further comprising a transmission plate assembly and a handle piston column assembly disposed inside and outside the drug delivery tube, the handle piston column assembly acting on the end of the transmission plate assembly, the transmission plate assembly being positioned above the valve assembly, and when the handle piston column assembly drives the transmission plate assembly to run, it is used to open the valve assembly channel; the handle piston column assembly includes a handle frame and a piston assembly, the piston assembly being used for injecting liquid drugs, and the handle frame providing a bridge for communication between the piston assembly and the inside of the drug delivery tube.

[0005] Preferably, the valve assembly includes a first valve disc and a second valve disc, the first valve disc and the second valve disc acting on the inner wall of the dosing end tube in an inverted "V" structure, and a sealing strip is provided at the end of the second valve disc near the first valve disc.

[0006] Preferably, the transmission plate assembly includes a mounting steel pipe and cam plates that are fixed on the mounting steel pipe at equal intervals. Each cam plate is eccentrically arranged relative to the mounting steel pipe, and the arc-shaped bottom end of the cam plate abuts against the connection between the first valve plate and the second valve plate.

[0007] Preferably, the cam plates located at both ends are provided with opening slots, the opening slots are connected to a connecting slot, and the end of the connecting slot away from the opening slot extends into the interior of the mounting steel pipe and communicates with it; it also includes two baffles fixed on the inner wall of the dosing end pipe, the two baffles are respectively placed at the cam plate positions at both ends, and their ends extend into the opening slots where the cam plates are located and are used for sealing them.

[0008] Preferably, the handle frame includes a connecting steel pipe, which has a U-shaped structure, and its open end is fixed to both ends of the mounting steel pipe and communicates with its interior. A one-way ratchet assembly is provided on the dosing end pipe, which acts at the connection position between the connecting steel pipe and the mounting steel pipe and is used for one-way step-by-step adjustment of the connecting steel pipe; each one-way ratchet assembly includes a mounting sleeve, which is mounted on the outer wall of the dosing end pipe via a spline strip; the inner wall of the mounting sleeve is provided with two upper and lower ratchet blocks, and a ratchet fixed on the connecting steel pipe; the ratchet is adapted to the two ratchet blocks for one-way step-by-step clockwise feed of the ratchet; and a pointer assembly is provided on the mounting sleeve, which includes a scale fixed on the mounting sleeve and a pointer fixed on the connecting steel pipe, used to display the amount of rotation of the connecting steel pipe as it rotates step-by-step.

[0009] Preferably, the piston assembly includes a piston sleeve, the side wall of which near the bottom is connected to two opposing rotating sealing sleeves, the two rotating sealing sleeves being rotatably mounted on the end of the connecting steel pipe and used to seal the connection between the piston sleeve and the connecting steel pipe; a piston rod disposed inside the piston sleeve, one end of which is provided with a piston that can extend and retract inside the piston sleeve, and the other end of which extends to the outer wall of the piston sleeve and is provided with a handle; and a scale line disposed on the piston sleeve for displaying the scale during quantitative drug dispensing; and a drug dispensing port disposed on the piston sleeve, on which an end cap is provided.

[0010] Preferably, the cannula body includes a tube body, and an inlet end and an outlet end respectively connected to both ends of the tube body. The number of drug injection components is four, and a chuck is fixed on the inlet end. The chuck has four grooves distributed in a ring, which are used to limit and engage the piston sleeve where the drug injection component is located.

[0011] Preferably, the pipe body is provided with a flow guiding assembly, which includes a second flow guiding shroud and a first flow guiding shroud. The second flow guiding shroud is formed by a second inner arc portion and a second outer arc portion that are connected internally and externally. The outer edge of the second outer arc portion is fixed to the inner wall of the pipe body and located below the connecting steel pipe. A connector is provided at the inner end of the second inner arc portion. An action block is fixedly connected to the end of the connector away from the second inner arc portion. A rotatable mounting ring is installed on the action block. The mounting ring is provided with annularly distributed blades. A concave groove is provided at the end of the action block. The first flow guiding shroud is formed by a first inner arc portion and a first outer arc portion that are connected internally and externally. A plurality of connecting strips are annularly distributed on the first flow guiding shroud. The ends of the connecting strips away from the first flow guiding shroud are fixedly connected to the connection recess between the second outer arc portion and the second inner arc portion.

[0012] A method for drug injection in hemodialysis, applied to the aforementioned drug injection structure for hemodialysis, the method comprising: S1: When medication is required, the drug injection assembly, if it is a single-dose injection, is used to inject a fixed amount of medication into the piston assembly. The piston assembly is manually pressurized to allow the medication to enter the drug delivery tube above the valve assembly. At the same time, the handle frame on the handle piston assembly is rotated, which in turn drives the transmission plate assembly to open the valve assembly channel. Under the combined action of pressurization and channel opening, the medication enters the tubing. S2: If it is a continuous injection method for the drug, the handle frame is used to drive the transmission plate assembly to force the valve assembly channel to open. The degree to which the valve assembly channel is opened depends on the degree of rotation of the handle frame. When the valve assembly channel is opened to the set degree, the piston assembly is used as an intermediate bridge to realize the continuous injection process of the drug.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention presents a drug injection structure that can be integrated into the extracorporeal circulation system during hemodialysis. When not in use, it remains in a closed state, not affecting the hemodialysis treatment process. When drug therapy is required, the valve assembly acts as an internal normally closed switch. In conjunction with the transmission plate assembly and the handle piston column assembly, different drug delivery methods can be achieved, enabling both quantitative and continuous drug delivery, ensuring safety and stability.

[0014] By improving the cam plates at both ends, when the cam plates are in the initial position, the channel of the opening groove is blocked by the action of the baffle, forming several independent sealed spaces, which improves the safety and pollution-free nature of the hemodialysis process. When it is necessary to change the medicine bottle during the continuous dripping of medicine, the transmission plate assembly can be moved to the initial position, and the valve assembly channel and the opening groove are closed, effectively avoiding the adverse effects of blood backflow.

[0015] During continuous infusion, the piston assembly is used as an intermediate bridge to achieve continuous drug injection with adjustable valve assembly channel size. This improves the mixing efficiency of drugs and blood and also enhances patient acceptance of the infusion process.

[0016] As part of the cannula's structural design, the chuck and slots on it provide a stable placement for each drug injection component. The storage space is reasonable, and multiple drug injection components can be used for simultaneous injection of different drugs, thus improving the scope of application and treatment effectiveness.

[0017] In another embodiment of the present invention, a further configured flow guiding component, including a second flow guiding hood and a first flow guiding hood, enables multiple mixing and collisions between the drug and blood, which is beneficial for actively integrating the drug into the hemodialysis process. This structure realizes the entire process from drug injection and drug mixing, bringing a positive impact on drug combination therapy under systemic circulation. Attached Figure Description

[0018] Figure 1 This is a partial disassembly diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 for Figure 1 A second-view 3D structural diagram; Figure 4 This is a front view structural diagram of the present invention; Figure 5 This is an enlarged three-dimensional cross-sectional schematic diagram of the present invention; Figure 6 This is an enlarged cross-sectional view of the present invention. Figure 7 This is an enlarged structural diagram of point A in the present invention; Figure 8 This is an enlarged structural diagram of point B in the present invention; Figure 9 A magnified schematic diagram of a portion of the structure (5). Figure 10 This is a schematic diagram of the disassembled structure of the flow guiding component of the present invention; Figure 11 for Figure 10A schematic diagram of the second-view structure; Figure 12 This is a partially enlarged structural diagram of the piston assembly of the present invention; Figure 13 This is a wireframe diagram of the internal structure of the cam plate of the present invention; Figure 14 This is a schematic diagram of the cam plate structure of the present invention; Figure 15 This is a schematic diagram of the unidirectional ratchet assembly structure of the present invention.

[0019] In the diagram: 111, inlet end; 112, chuck; 113, slot; 114, tube body; 115, outlet end; 211. Piston rod; 212. Piston sleeve; 213. Connecting steel pipe; 214. Rotating sealing sleeve; 215. Scale mark; 216. Dosing port; 311. Steel pipe installation; 312. Dosing end pipe; 313. Cam plate; 3132. Connecting groove; 3134. Opening groove; 314. Stop bar; 315. Valve assembly; 3151. First valve plate; 3152. Second valve plate; 3153. Sealing strip; 316. Top cover; 411. Pointer; 412. Dial; 413. Ratchet; 414. Mounting sleeve; 415. Ratchet; 416. Spline bar; 611. First fairing; 6111. First outer arc portion; 6112. First inner arc portion; 612. Connecting strip; 711. Second fairing; 7111. Second outer arc portion; 7112. Second inner arc portion; 712. Connector; 713. Actuating block; 7131. Concave groove; 714. Mounting ring; 715. Blade. Detailed Implementation

[0020] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. The various embodiments of this invention are described in detail below with reference to the accompanying drawings. Example

[0021] Please see Figures 1 to 15The present invention preferably provides a technical solution: a drug injection structure for hemodialysis, comprising: a cannula for connection to an extracorporeal circulation system for hemodialysis; and a plurality of drug injection assemblies arranged circumferentially on the cannula; each drug injection assembly includes a drug delivery tube 312 communicating with the cannula, and a valve assembly 315 disposed inside the drug delivery tube 312, serving as an internal normally closed switch for the drug injection assembly; it also includes a transmission plate assembly and a handle piston column assembly disposed inside and outside the drug delivery tube 312, the handle piston column assembly acting on the end of the transmission plate assembly, the transmission plate assembly being positioned above the valve assembly 315, and when the handle piston column assembly drives the transmission plate assembly to run, it is used to open the channel of the valve assembly 315; the handle piston column assembly includes a handle frame and a piston assembly, the piston assembly being used to inject liquid drugs, and the handle frame providing a bridge for communication between the piston assembly and the inside of the drug delivery tube 312.

[0022] This application describes a drug injection structure that can be connected to the extracorporeal circulation system during hemodialysis. When not in use, it remains in a closed state, not affecting the hemodialysis treatment process. When drug therapy is required, the structure allows for drug injection... Figure 1 , 2 As shown in Figures 5, 6 and 8, under the action of the valve assembly 315, which acts as an internal normally closed switch, and in conjunction with the further action of the transmission plate assembly and the handle piston column assembly, different drug dispensing methods can be realized. One method involves a quantitative drug delivery system. A set piston assembly is used to deliver a fixed amount of drug into the piston assembly. The piston assembly is manually pressurized, allowing the drug to enter the drug delivery tube 312 above the valve assembly 315. At the same time, the handle frame on the handle piston assembly is rotated, which in turn drives the transmission plate assembly to open the valve assembly 315 channel. Under the combined action of pressurization and channel opening, the drug enters the tubing, that is, enters the extracorporeal circulation system under hemodialysis. The drug quickly integrates in the blood and returns to the patient's body to achieve the purpose of treatment, thus realizing the quantitative drug delivery process. Another method involves continuous drug delivery. The handle frame drives the transmission plate assembly, forcing the valve assembly 315 channel to open. The degree to which the valve assembly 315 channel opens depends on the rotation of the handle frame. When the valve assembly 315 channel opens to a set degree, the piston assembly acts as an intermediate bridge to connect the drug delivery device. With the valve assembly 315 channel size adjustable, continuous drug delivery is achieved, improving the mixing efficiency of the drug and blood, and also improving the patient's acceptance of the delivery process.

[0023] Furthermore, a top cover 316 that can be opened and closed is provided on the top of the dosing end pipe 312. The top cover 316 and the dosing end pipe 312 can be connected by threads. When the top cover 316 is opened, it can be easily cleaned and replaced.

[0024] Furthermore, the valve assembly 315 includes a first valve plate 3151 and a second valve plate 3152. The first valve plate 3151 and the second valve plate 3152 act on the inner wall of the dosing end tube 312 in an inverted "V" structure, and a sealing strip 3153 is provided at the end of the second valve plate 3152 near the first valve plate 3151.

[0025] Furthermore, the transmission plate assembly includes a mounting steel pipe 311 and cam plates 313 fixed on the mounting steel pipe 311 and distributed at equal intervals. Each cam plate 313 is eccentrically arranged relative to the mounting steel pipe 311, and the arc-shaped bottom end of the cam plate 313 abuts against the connection between the first valve plate 3151 and the second valve plate 3152.

[0026] Through further configuration of the valve assembly 315, such as Figure 8 As shown, when the cam plate 313 is in the initial position, the transmission plate assembly, the first valve plate 3151 and the second valve plate 3152, together with the sealing effect of the sealing strip 3153, form a stable sealed connection by mutual contact, achieving the stability of the normally closed state. The first valve plate 3151 and the second valve plate 3152 are both made of thick medical silicone, which is wear-resistant and has high resilience. After the transmission plate assembly is completed, the first valve plate 3151 and the second valve plate 3152 can elastically reset and return to the closed state. Example

[0027] In another embodiment of the present invention, the cam plates 313 located at both ends are provided with opening slots 3134, the opening slots 3134 are connected to the connecting slots 3132, and the end of the connecting slots 3132 away from the opening slots 3134 extends into the interior of the mounting steel pipe 311 and communicates with it. It also includes two baffles 314 fixed on the inner wall of the dosing end tube 312. The two baffles 314 are respectively placed on the cam plate 313 at both ends, and their ends extend to the opening groove 3134 where the cam plate 313 is located and are used for sealing.

[0028] In this embodiment, the mounting steel pipe 311 is further improved by utilizing its rotational characteristics to modify the cam plates 313 at both ends, such as... Figure 13 and 14 Furthermore, a connecting groove 3132 and an opening groove 3134 were created to connect it with the mounting steel pipe 311 where the cam plate 313 is located, while in the case of Figure 3In the process, the piston sleeve 212 is connected to the installation steel pipe 311 by connecting steel pipe 213. When the cam plate 313 is in the initial position, the channel of the opening groove 3134 is blocked under the action of the stop bar 314, forming several independent sealed spaces, which improves the safety and pollution-free nature of the hemodialysis process. When the cam plate 313 is triggered, the channel of the opening groove 3134 is opened, and the corresponding piston assembly is injected with medicine. In another function of its structure, especially during continuous infusion of medication, when it is often necessary to change the medication bottle, the transmission plate assembly can be moved to the starting position, and both the valve assembly 315 channel and the opening groove 3134 are closed, effectively avoiding the adverse effects of blood backflow. Example

[0029] In another embodiment of the present invention, the handle frame includes a connecting steel pipe 213, which has a U-shaped structure, with its open end fixed to both ends of the mounting steel pipe 311 and communicating with its interior; and a one-way ratchet assembly disposed on the dosing end pipe 312, which acts at the connection position between the connecting steel pipe 213 and the mounting steel pipe 311 and is used for one-way stepwise adjustment of the connecting steel pipe 213; each one-way ratchet assembly includes a mounting sleeve 414, which is splined onto the dosing end pipe 312 via a splined strip 416. On the outer wall, the inner wall of the mounting sleeve 414 is provided with two upper and lower ratchet blocks 413, and a ratchet 415 fixed on the connecting steel pipe 213. The ratchet 415 is adapted to the two ratchet blocks 413 for clockwise unidirectional step-by-step feeding. There is also a pointer assembly provided on the mounting sleeve 414. The pointer assembly includes a scale 412 fixed on the mounting sleeve 414 and a pointer 411 fixed on the connecting steel pipe 213. When the connecting steel pipe 213 rotates step by step, it is used to display the amount of rotation of the connecting steel pipe 213.

[0030] In this embodiment, the handle frame is further modified, such as... Figure 1 and 3 As shown, when the drug injection assembly at a certain location needs to be used, the connecting steel pipe 213 at the corresponding location is turned upwards, thereby causing the cam plate 313 where the mounting steel pipe 311 is located to rotate clockwise. On the one hand, the opening slot 3134 disengages from the stop bar 314 and opens the channel; on the other hand, under the action of the cam plate 313, combined with... Figure 8 As shown, when the cam 313 where the steel pipe 311 is installed rotates clockwise, the corresponding first valve disc 3151 and second valve disc 3152 are forced to separate, further opening the internal channel of the dosing end pipe 312. The degree of opening depends on the amount of rotation of the cam 313, in conjunction with a further designed one-way ratchet assembly, such as... Figure 7As shown, under the combined action of the upper and lower ratchet blocks 413 and the ratchet 415, the connecting steel pipe 213 where the ratchet 415 is located can rotate clockwise in one direction step by step, thereby precisely adjusting the channel size of the first valve plate 3151 and the second valve plate 3152. The corresponding dial 412 and pointer 411 can display the rotation amount of the connecting steel pipe 213, thereby indicating the channel size of the first valve plate 3151 and the second valve plate 3152. That is, the larger the reading displayed on the dial 412, the larger the corresponding channel size. like Figure 15 As shown, since the mounting sleeve 414 and the dosing end tube 312 are splined limit assembly, when the mounting sleeve 414 is pulled outward relative to the ratchet 415, the ratchet block 413 disengages from the ratchet 415, thus enabling the ratchet 415 to rotate freely, that is, the handle frame is reset. Example

[0031] In another embodiment of the present invention, the piston assembly includes a piston sleeve 212, the side wall of the piston sleeve 212 near the bottom being connected to two opposing rotating sealing sleeves 214, the two rotating sealing sleeves 214 being rotatably mounted on the end of the connecting steel pipe 213 and used to seal and connect the piston sleeve 212 and the connecting steel pipe 213; a piston rod 211 disposed inside the piston sleeve 212, one end of the piston rod 211 being provided with a piston that can extend and retract inside the piston sleeve 212, and the other end extending to the outer wall of the piston sleeve 212 and being provided with a handle; a scale line 215 disposed on the piston sleeve 212 for scale display during quantitative drug dispensing; and a drug dispensing port 216 disposed on the piston sleeve 212, on which an end cap is disposed.

[0032] Furthermore, the structure of the piston assembly was proposed, such as... Figure 1 , 5 As shown in Figures 6 and 12, the rotating sealing sleeve 214 here is a mature existing technology. As a connecting sealing structure for the rotation of liquid pipeline, under its action, without affecting the connection between the connecting steel pipe 213 and the piston sleeve 212, the piston sleeve 212 can rotate relative to the connecting steel pipe 213. It has two filling methods. When adding the drug solution in the corresponding embodiment 1, first keep the connecting steel pipe 213 in a horizontal position, rotate the piston sleeve 212 so that it is perpendicular to the connecting steel pipe 213, then open the drug filling port 216 where the piston sleeve 212 is located, add the drug into it, and display the reading through the scale line 215. After the quantitative amount is reached, close the drug filling port 216. Then, push the connecting steel pipe 213 upward with one hand to open the opening groove 3134 and the valve assembly 315 channel, and push the piston rod 211 with the other hand. Under the action of pressure, the quantitative drug is added into the tube sleeve body. When continuously injecting the drug solution as described in Example 1, the end cap of the injection port 216 is opened. Preferably, the injection port 216 has a thread on its inner side, which can be connected to an existing syringe. When the connecting steel pipe 213, the opening groove 3134, and the valve assembly 315 are pushed to open and move to the size of the continuous injection channel, the drug solution can be continuously injected and mixed with blood to work together with the patient. Example

[0033] In another embodiment of the present invention, the tube sleeve includes a tube body 114, and an inlet end 111 and an outlet end 115 respectively connected to both ends of the tube body 114. The number of drug injection components is four sets, and a chuck 112 fixed on the inlet end 111. The chuck 112 has four grooves 113 arranged in a ring, which are used to limit and lock the piston sleeve 212 where the drug injection components are located.

[0034] As a structural feature of the sleeve body, such as Figure 1 As shown, the chuck 112 and slot 113 provided on it enable each drug injection component to have a stable placement position, with reasonable storage space. Multiple drug injection components can be used for simultaneous injection of different drugs, improving the scope of use and treatment effect. Example

[0035] In another embodiment of the present invention, a flow guiding assembly is provided inside the pipe body 114. The flow guiding assembly includes a second flow guiding shroud 711 and a first flow guiding shroud 611. The second flow guiding shroud 711 is formed by a second inner arc portion 7112 and a second outer arc portion 7111 connected internally and externally. The outer end edge of the second outer arc portion 7111 is fixed to the inner wall of the pipe body 114 and located below the connecting steel pipe 213. A connecting member 712 is provided at the inner end of the second inner arc portion 7112. The end of the connecting member 712 away from the second inner arc portion 7112 is fixedly connected to a... The action block 713 has a rotatable mounting ring 714 mounted on it, and the mounting ring 714 is provided with annularly distributed blades 715; and a concave groove 7131 is provided at the end of the action block 713; the first guide shield 611 is composed of a first inner arc portion 6112 and a first outer arc portion 6111 connected internally and externally, and a plurality of connecting strips 612 are annularly distributed on the first guide shield 611, and the ends of the connecting strips 612 away from the first guide shield 611 are fixedly connected to the connection recess of the second outer arc portion 7111 and the second inner arc portion 7112.

[0036] In this embodiment, a further configured flow guiding component is provided, which includes a second flow guiding shroud 711 and a first flow guiding shroud 611, such as... Figure 5 , 6As shown in 9, 10 and 11, the added medicine moves along the outer arc of the second outer arc portion 7111 and the inner arc of the second inner arc portion 7112. The blood circulating outside the body enters along the inlet end 111 and impacts the concave groove 7131, spreading outwards. This mixes with the medicine along the outer arc of the second outer arc portion 7111 and the inner arc of the second inner arc portion 7112. The mixture flows into the narrow channel of the action block 713 and the second inner arc portion 7112. Under the combined action of the fluid and the shape of the blade 715, the blade 715 rotates, causing the medicine and blood to mix again. Finally, the mixture impacts the first guide shroud 611 and enters the outlet end 115 along the channel formed by the outer edge arc surface of the first guide shroud 611, thus realizing the process of adding medicine and mixing medicine in one go. The first guide shield 611 acts on the end of the second guide shield 711 through the connecting strip 612. Preferably, the connecting strip 612 is made of elastic material. When the fluid velocity flowing in the direction of the liquid inlet 111 is high, the connecting strip 612 where the first guide shield 611 is located is stretched. At this time, the channel formed by the second inner arc portion 7112 and the first guide shield 611 increases, which facilitates the rapid passage of fluid. In case of an accident, if the fluid flows in reverse, the first guide shield 611 will squeeze the connecting strip 612 and move it closer to the second inner arc portion 7112, so that the channel is reduced until it is closed. This design effectively reduces the adverse effects caused by blood backflow during circulation. Example

[0037] As a method for drug injection under hemodialysis according to the present invention, applied to the aforementioned drug injection structure under hemodialysis, the method includes: S1: When drug injection is required, if a single-dose injection is needed, the set piston assembly will add a fixed amount of drug into the piston assembly. The piston assembly will be manually pressurized to allow the drug to enter the drug delivery tube 312 above the valve assembly 315. At the same time, the handle frame on the handle piston assembly will be rotated, which will drive the transmission plate assembly to force the valve assembly 315 channel to open. Under the combined action of pressurization and channel opening, the drug will enter the tube sleeve. S1: If it is a continuous injection method for the drug, the handle frame is used to drive the transmission plate assembly to force the valve assembly 315 channel to open. The degree to which the valve assembly 315 channel is opened depends on the degree of rotation of the handle frame. When the valve assembly 315 channel is opened to the set degree, the piston assembly is used as an intermediate bridge to realize the continuous injection process of the drug.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection. There are various ways to install detachably, such as by using a plug-in and snap-fit ​​method, or by using a bolt connection, etc.

[0039] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. A drug injection structure for hemodialysis, characterized in that, include: The cannula is used to connect to the extracorporeal circulation system during hemodialysis; And a number of drug injection components arranged circumferentially distributed on the sleeve body; Each drug injection assembly includes a drug delivery tube (312) communicating with the tube sleeve, and a valve assembly (315) disposed inside the drug delivery tube (312) as an internal normally closed switch of the drug injection assembly. The valve assembly (315) includes a first valve disc (3151) and a second valve disc (3152), wherein the first valve disc (3151) and the second valve disc (3152) act on the inner wall of the dosing end tube (312) in an inverted "V" structure; It also includes a transmission plate assembly and a handle piston column assembly disposed inside and outside the dosing end tube (312). The handle piston column assembly acts on the end of the transmission plate assembly. The transmission plate assembly is placed above the valve assembly (315). When the handle piston column assembly drives the transmission plate assembly to run, it is used to open the channel of the valve assembly (315). The transmission plate assembly includes a mounting steel pipe (311) and cam plates (313) fixed on the mounting steel pipe (311) and distributed at equal intervals. Each cam plate (313) is eccentrically arranged relative to the mounting steel pipe (311), and the arc-shaped bottom end of the cam plate (313) abuts against the connection between the first valve plate (3151) and the second valve plate (3152). The handle piston assembly includes a handle frame and a piston assembly for dispensing liquid drugs. The handle frame provides a bridge for communication between the piston assembly and the inside of the drug dispensing end tube (312). The piston assembly includes a piston sleeve (212), and the side wall of the piston sleeve (212) near the bottom is connected to two opposing rotating sealing sleeves (214). The two rotating sealing sleeves (214) are rotatably mounted on the end of the connecting steel pipe (213) and are used to seal the connection between the piston sleeve (212) and the connecting steel pipe (213). The handle frame includes a connecting steel pipe (213), which has a U-shaped structure. Its open end is fixed to both ends of the mounting steel pipe (311) and communicates with its interior.

2. The drug injection structure for hemodialysis according to claim 1, characterized in that: A sealing strip (3153) is provided at the end of the second valve disc (3152) near the first valve disc (3151).

3. The drug injection structure for hemodialysis according to claim 1, characterized in that: The cam plates (313) located at both ends are provided with opening slots (3134), and the opening slots (3134) are connected to the connecting slots (3132). The end of the connecting slots (3132) away from the opening slots (3134) extends into the interior of the mounting steel pipe (311) and is connected to it. It also includes two baffles (314) fixed on the inner wall of the dosing end tube (312), the two baffles (314) being placed on the cam plate (313) at the two ends respectively, and their ends extending to the opening groove (3134) where the cam plate (313) is located and used for sealing it.

4. The drug injection structure for hemodialysis according to claim 1, characterized in that: The dosing end pipe (312) is provided with a one-way ratchet assembly, which acts at the connection position between the connecting steel pipe (213) and the mounting steel pipe (311) and is used for one-way step-by-step adjustment of the connecting steel pipe (213); Each set of the unidirectional ratchet assembly includes a mounting sleeve (414), which is splined on the outer wall of the dosing end pipe (312) via a splined strip (416). The inner wall of the mounting sleeve (414) is provided with two upper and lower ratchet blocks (413) and a ratchet (415) fixed on the connecting steel pipe (213). The ratchet (415) is adapted to the two ratchet blocks (413) for clockwise unidirectional stepwise feeding of the ratchet (415). The pointer assembly is provided on the mounting sleeve (414), the pointer assembly including a dial (412) fixed on the mounting sleeve (414) and a pointer (411) fixed on the connecting steel pipe (213), which is used to display the amount of rotation of the connecting steel pipe (213) as the connecting steel pipe (213) rotates step by step.

5. The drug injection structure for hemodialysis according to claim 1, characterized in that: The piston sleeve (212) is provided with a piston rod (211). One end of the piston rod (211) is provided with a piston that can extend and retract inside the piston sleeve (212), and the other end extends to the outer wall of the piston sleeve (212) and is provided with a handle. And the scale line (215) set on the piston sleeve (212) is used for scale display during quantitative drug dispensing; It also includes a dosing port (216) provided on the piston sleeve (212), which is provided with an end cap.

6. The drug injection structure for hemodialysis according to claim 1, characterized in that: The tube sleeve includes a tube body (114), and an inlet end (111) and an outlet end (115) respectively connected to both ends of the tube body (114). The number of drug injection components is four, and a chuck (112) fixed on the inlet end (111). The chuck (112) has four grooves (113) distributed in a ring, which are used to limit and lock the piston sleeve (212) where the drug injection components are located.

7. The drug injection structure for hemodialysis according to claim 6, characterized in that: The tube body (114) is provided with a flow guiding assembly, which includes a second flow guiding shroud (711) and a first flow guiding shroud (611). The second flow guiding shroud (711) is formed by a second inner arc portion (7112) and a second outer arc portion (7111) that are connected internally and externally. The outer edge of the second outer arc portion (7111) is fixed on the inner wall of the tube body (114) and located below the connecting steel pipe (213). A connector (712) is provided at the inner end of the second inner arc portion (7112). An action block (713) is fixedly connected to the end of the connector (712) away from the second inner arc portion (7112). A rotatable mounting ring (714) is installed on the action block (713). A ring-shaped blade (715) is provided on the mounting ring (714). And a concave groove (7131) provided at the end of the action block (713); The first air deflector (611) is composed of a first inner arc portion (6112) and a first outer arc portion (6111) connected internally and externally. A plurality of connecting strips (612) are distributed in a ring on the first air deflector (611). The ends of the connecting strips (612) away from the first air deflector (611) are fixedly connected to the connection recess of the second outer arc portion (7111) and the second inner arc portion (7112).

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