A kind of infusion system and liquid circuit switching device thereof

Abstract

The present invention discloses an infusion system and a fluid circuit switching device thereof, the fluid circuit switching device comprising a button, an end cover assembly, a cavity and a liquid stopper, the cavity is formed inside the end cover assembly, the cavity is provided with a first pipeline groove for installing a first infusion pipeline and a second pipeline groove for installing a second infusion pipeline, the liquid stopper is arranged between the first pipeline groove and the second pipeline groove, the distal end of the button extends into the cavity and connects to the liquid stopper, so that the button can drive the liquid stopper to squeeze the first infusion pipeline in the first pipeline groove or squeeze the second infusion pipeline in the second pipeline groove. Finally, the switching of the two fluid circuits' on-off infusion modes is completed, avoiding the tediousness of traditional manual flushing. At the same time, the non-direct contact between the valve body and the liquid medicine also avoids the risk of the liquid medicine being contaminated by bacteria, reducing the processing requirements for the sealing of the valve body structure.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an infusion system and a fluid path switching device thereof. Background Art

[0002] Malignant tumors have always been a high-risk disease that seriously threatens human life. Intravenous chemotherapy is one of the main means of treating malignant tumors. Intravenous chemotherapy is often infused through intravenous catheters such as PICC (peripherally inserted central catheter), CVC (central venous catheter) or PORT (port) to reduce the damage of chemotherapy drugs to veins. According to the requirements for intravenous catheter maintenance in the "Technical Operation Specifications for Intravenous Treatment Nursing" issued by the National Health and Family Planning Commission in 2013, it is advisable to use normal saline pulse flushing for intravenous catheters before and after medication. After the infusion is completed, the catheter should be flushed with normal saline or heparin saline twice the volume of the catheter plus the extension tube under positive pressure.

[0003] The infusion systems currently on the market are generally mechanical drip infusion bottles or tumor chemotherapy infusion systems with medicine bags (referred to as chemotherapy pumps). Compared with mechanical drip infusion bottles, chemotherapy pumps can effectively control the concentration, speed, dosage and time of medication, and achieve the requirement of 48h to 120h of continuous intravenous infusion of a single treatment dose by administering small doses and long-term intravenous administration, so that high-concentration chemotherapy drugs maintain a constant blood drug concentration in the patient's body, ensuring that the drugs stay in the body for a long time, thereby enhancing the activity of anti-cancer cells, reducing the toxicity and adverse reactions of chemotherapy drugs, and significantly reducing the intestinal reactions of patients during the period of continuous pumping of drugs using chemotherapy pumps. At the same time, it is also convenient for patients to carry, solving the inconvenience of long-term bed rest for traditional infusion patients.

[0004] However, although the chemotherapy pumps currently on the market can achieve precise control over drug concentration, speed, dosage, time, etc., meeting the needs of patients for long-term drug infusion and facilitating their lives, the chemotherapy devices on the market can only be loaded with one type of tumor chemotherapy drug. After the infusion is completed, medical staff are required to manually disconnect the human body from the infusion system, and then use a syringe to fill with saline for manual flushing of the tube. This method is obviously inefficient and cannot meet the common needs of current doctors and patients. It wastes a lot of medical resources and invisibly prolongs the patient's recovery time. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an infusion system and a liquid circuit switching device thereof, which can effectively avoid the risk of drug liquid being contaminated due to direct contact between the pump body and the drug liquid, and at the same time can switch to select the infusion of chemotherapy drug liquid or saline solution for flushing the tube, replacing the traditional manual flushing, thereby improving the infusion efficiency and saving medical resources.

[0006] In order to solve the above technical problems, the present invention provides a liquid circuit switching device, including a button, an end cover assembly, a cavity and a liquid stop part, the cavity is formed inside the end cover assembly, the cavity is provided with a first pipeline groove for installing a first infusion pipeline and a second pipeline groove for installing a second infusion pipeline, the liquid stop part is arranged between the first pipeline groove and the second pipeline groove, the distal end of the button extends into the cavity and is connected to the liquid stop part, so that the button can drive the liquid stop part to squeeze the first infusion pipeline in the first pipeline groove or squeeze the second infusion pipeline in the second pipeline groove.

[0007] Preferably, the end cover assembly comprises a first end cover, a second end cover, a first stopper and a second stopper, the cavity is arranged between the first end cover and the second end cover, and the first pipeline groove and the second pipeline groove are arranged between the first stopper and the second stopper.

[0008] Preferably, the liquid circuit switching device also includes a pipeline switching assembly, which includes a reversing component and a liquid-stop component. The distal end of the button passes through the first end cover and is connected to the reversing component, and the proximal end of the button is exposed at the first end cover. The reversing component and the liquid-stop component can move axially along the cavity under the control of the button.

[0009] Preferably, the pipeline switching assembly further comprises a guide key, and the liquid-stopping member is fixedly connected to the reversing member via the guide key.

[0010] Preferably, the pipeline switching assembly also includes a positioning pin and an axial retaining ring. The positioning pin is inserted into the cavity through the second end cover. The axial retaining ring is used to axially position the positioning pin. The reversing component is sleeved outside the positioning pin and can slide relative to the positioning pin.

[0011] Preferably, the locating pin is provided with an annular groove, the axial retaining ring is clamped in the annular groove, the axial retaining ring is arranged in the cavity and close to the second end cover, and the axial retaining ring axially limits the locating pin, so that the locating pin provides stable axial support for the spring and the reversing component.

[0012] Preferably, the pipeline switching assembly further comprises a spring, the spring is sleeved on the positioning pin, and two ends of the spring are respectively connected to the second end cover and the reversing component.

[0013] Preferably, the first end cover has a first cylindrical cavity and a second cylindrical cavity that are connected, and the button includes a key segment, a matching segment and a connecting segment that are arranged in sequence, the key segment can slide relative to the first cylindrical cavity, the shape of the matching segment matches the shape of the second cylindrical cavity, and the connecting segment is matched and plugged with the reversing component.

[0014] Preferably, the mating section includes a plurality of button bosses arranged circumferentially around the button axis, the button bosses include a first locking surface and a second locking surface, the second cylindrical cavity is provided with a first end cover long boss, the first locking surface and the second locking surface are at different positions in the axial direction of the button, the first locking surface and the second locking surface are alternately abutted against the first end cover long boss as the button rotates, so that the button can drive the liquid stopping member to stay at a position to stop the flow of the second infusion pipeline or a position to stop the flow of the first infusion pipeline.

[0015] Preferably, the button boss also includes a button boss bevel, the first locking surface and the second locking surface are set on both sides of the button boss bevel, the second cylindrical cavity is also provided with a first end cover short boss, the first end cover long boss and the first end cover short boss are respectively provided with a first end cover long boss bevel and a first end cover short boss bevel, the button boss bevel is slidably connected with the first end cover long boss bevel and / or the first end cover short boss bevel as the button rotates, so that when the button is pressed, the button rotates relative to the first end cover and expands and contracts relative to the cavity.

[0016] Preferably, the first pipeline groove and the second pipeline groove are C-shaped.

[0017] In order to solve the above technical problems, the present invention also provides an infusion system, including a pump body, a medicine box and the above-mentioned liquid circuit switching device, the medicine box includes a first medicine bag filled with a first liquid and a second medicine bag filled with a second liquid, the first medicine bag is connected to a first infusion pipeline, the second medicine bag is connected to a second infusion pipeline, the first infusion pipeline is fixed in the first pipeline groove, the second infusion pipeline is fixed in the second pipeline groove, the pump body is connected to the medicine box, and the pump body is used to control the infusion of the first liquid or the second liquid.

[0018] Preferably, the bottom of the medicine box has a cavity, and the liquid path switching device is detachably mounted in the cavity at the bottom of the medicine box.

[0019] Preferably, the first liquid is a saline flushing liquid, and the second liquid is a chemotherapy liquid, or the first liquid is a chemotherapy liquid, and the second liquid is a saline flushing liquid. Compared with the prior art, the present invention has the following beneficial effects: the infusion system and the liquid circuit switching device provided by the present invention, through the driving coordination setting of the button and the liquid stop member, after manually pressing the button, the position of the liquid stop member is controlled, that is, the on-off mode of the two liquid circuits of the chemotherapy liquid and the saline flushing liquid is controlled, so as to realize the infusion of the chemotherapy liquid and the automatic flushing function before and after the infusion of the chemotherapy liquid. In particular, the connection structure design of the button, the reversing component, the spring, the axial retaining ring, and the positioning pin determines the action direction of the reversing component, and cooperates with the guide key, the liquid stop member, the first stop block, and the second stop block to realize the stroke position control of the action direction, and finally completes the switching of the on-off infusion mode of the two liquid circuits, avoiding the cumbersomeness of traditional manual flushing. At the same time, the non-direct contact between the valve body and the liquid medicine also avoids the risk of bacterial contamination of the liquid medicine, and reduces the processing requirements for the sealing of the valve body structure. By placing the liquid circuit switching device between the pipelines of the two medicine bags, the medicine bag to be infused can be switched instantly. While having the functions of the traditional liquid circuit switching three-way valve, it realizes precise control of liquid circuit switching, reduces the risk of drug contamination, is simple to operate, convenient and fast, and brings great convenience to medical work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional structure diagram of a liquid path switching device when the left side stops liquid and the right side allows liquid in an embodiment of the present invention;

[0021] Figure 2 It is a schematic cross-sectional structure diagram of a liquid path switching device when the left side is liquid-passing and the right side is liquid-stopping in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of the tumor chemotherapy infusion system according to an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of a button in an embodiment of the present invention;

[0024] Figure 5 is a schematic cross-sectional structure diagram of a first end cover in an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the assembly of the button and the first end cover when the left side stops the liquid and the right side allows the liquid in an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the assembly of the button and the first end cover when the left side allows liquid to pass and the right side stops liquid in an embodiment of the present invention.

[0027] In the figure:

[0028] 1-end cover assembly, 2-button, 3-cavity, 4-pipeline switching assembly, 11-first end cover, 12-second end cover, 13-second stopper, 14-first stopper, 41-reversing component, 42-guide key, 43-liquid stopper, 44-spring, 45-locating pin, 46-axial retaining ring, 3a-first pipeline groove, 3b-second pipeline groove, 451-end, 452-main body, 21-button section, 22-matching section, 23-connecting section, 211-button convex Platform, 2111-button boss inclined surface, 2112-first locking surface, 2113-second locking surface, 111-first cylindrical cavity, 112-second cylindrical cavity, 113-first end cover long boss, 114-first end cover long boss inclined surface, 115-first end cover short boss, 116-first end cover short boss inclined surface, 121-step hole, 1211-first through hole, 1212-second through hole, 10-pump body stand-alone, 20-medicine box, 30-liquid circuit switching device. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] As used in this specification, the singular forms "a", "an", and "the" include plural referents unless the context clearly indicates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the context clearly indicates otherwise. The term "proximal end" generally refers to the end closer to the operator, and the term "distal end" generally refers to the end farther from the object of operation of the surgical instrument. See Figure 1 The liquid circuit switching device provided in this embodiment includes: an end cap assembly 1, a button 2, a cavity 3, a pipeline switching assembly, and a first pipeline groove 3a and a second pipeline groove 3b arranged in the cavity 3. The end cap assembly 1 includes: a first end cap 11, a second end cap 12, a first stopper 14 and a second stopper 13. The pipeline switching assembly includes a reversing component 41 and a liquid stopper 43. The cavity 3 is formed inside the end cap assembly 1, and the first end cap 11, the second end cap 12, the first stopper 14 and the second stopper 13 are arranged around the cavity 3. The cavity 3 is provided with a first pipeline groove 3a for installing a first infusion pipeline and a second pipeline groove 3b for installing a second infusion pipeline. The liquid stop member 43 is arranged between the first pipeline groove 3a and the second pipeline groove 3b. The distal end of the button 2 extends into the cavity of the cavity 3 to connect with the liquid stop member 43, so that the button 2 can drive the liquid stop member 43 to squeeze the first infusion pipeline in the first pipeline groove 3a or squeeze the second infusion pipeline in the second pipeline groove 3b.

[0031] by Figure 1As shown in the example, the upper left side of the cavity 3 is connected to the first end cover 11, the upper right side of the cavity 3 is connected to the second end cover 12, the lower left side of the cavity 3 is connected to the first stopper 14, and the lower right side of the cavity 3 is connected to the second stopper 13. The interior of the cavity 3 is a hollow structure, providing an installation space for the pipeline switching assembly. Specifically, the reversing component 41 is arranged in the cavity 3, one end of the button 2 passes through the first end cover 11 and is connected to the reversing component 41, and the other end of the button 2 is exposed to the first end cover 11. The reversing component 41 and the liquid stopper 43 can move along the axial direction of the cavity 3 under the control of the button 2.

[0032] The first stopper 14 and the second stopper 13 are arranged outside the cavity 3 at intervals, and two pipeline grooves are arranged on the cavity 3 between the first stopper 14 and the second stopper 13, and the pipeline grooves are used to fix the infusion pipeline connected to the medicine bag. The two pipeline grooves are respectively a first pipeline groove 3a and a second pipeline groove 3b. The first pipeline groove 3a is arranged close to the first stopper 14, and the second pipeline groove 3b is arranged close to the second stopper 13. The first pipeline groove 3a and the second pipeline groove 3b are C-shaped structures, which respectively fix the infusion pipelines corresponding to the two medicine bags, that is, the first pipeline groove 3a is used to install the first infusion pipeline, and the second pipeline groove 3b is used to install the second infusion pipeline. One end of the liquid stopper 43 extends into the cavity 3 and is fixedly connected to the reversing component 41. Preferably, one end of the liquid stopper 43 is fixedly connected to the reversing component 41 via a guide key 42, and the other end of the liquid stopper 43 is arranged between the first pipeline groove 3a and the second pipeline groove 3b. Therefore, the liquid stopper 43 can move between the first stopper 14 and the second stopper 13 under the drive of the reversing component 41, so that the first pipeline groove 3a and the second pipeline groove 3b are in a closed or open state. Figure 1 As shown, when the first pipeline groove 3a is squeezed by the liquid stop member 43, it is in a closed state, so that the first infusion pipeline in the first pipeline groove 3a stops infusion and is in a liquid stop mode; and the second pipeline groove 3b is in an open state, so that the second infusion pipeline in the second pipeline groove 3b is opened for infusion and is in an infusion mode. Figure 2 As shown, when the reversing component 41 moves to the right end along the cavity 3 under the control of the button 2, the second pipeline groove 3b is in a closed state when it is squeezed by the liquid stopping component 43, so that the second infusion pipeline in the second pipeline groove 3b stops infusing and is in a liquid stopping mode; and the first pipeline groove 3a is in an open state, so that the first infusion pipeline in the first pipeline groove 3a is opened for infusion and is in an infusion mode.

[0033] like Figure 5As shown, the first end cover 11 includes: a first cylindrical cavity 111, a second cylindrical cavity 112, a first end cover long boss 113, a first end cover long boss inclined surface 114, a first end cover short boss 115 and a first end cover short boss inclined surface 116. The first end cover long boss 113 and the first end cover short boss 115 are formed on the inner wall of the first cylindrical cavity 111, and the second cylindrical cavity 112 is close to the cavity 3. The first end cover long boss 113 allows the button 2 to move inside the first end cover 11, and cooperates with the connection between the first end cover short boss 115 and the button 2, so that the button 2 is firmly connected to the first end cover 11 and will not fall out from the port of the first end cover 11.

[0034] like Figure 4 As shown, the button 2 includes: a button segment 21, a matching segment 22 and a connecting segment 23 arranged in sequence, the matching segment 22 includes a plurality of button bosses 211 arranged circumferentially around the button axis, the button segment 21 can slide relative to the first cylindrical cavity 111, the button 2 is approximately cylindrical, the shape of the matching segment 22 is further adapted to the shape of the second cylindrical cavity 112, and the connecting segment 23 is matched and plugged with the reversing component 41. Specifically, the matching segment 22 includes a plurality of button bosses 211 arranged circumferentially around the button axis, a single button boss 211 includes a button boss inclined surface 2111 and a first locking surface 2112 and a second locking surface 2113 arranged on both sides of the button boss inclined surface 2111, the first locking surfaces 2112 of adjacent button bosses 211 overlap or engage, the second locking surfaces 2113 of adjacent button bosses 211 overlap or engage, the first locking surface and the second locking surface are at different positions in the axial direction of the button, and the first locking surface and the second locking surface are arranged alternately. That is, two adjacent button bosses 211 share the same first locking surface 2112, or the first locking surfaces 2112 of two adjacent button bosses 211 are mutually engaged and smoothly transitioned; two adjacent button bosses 211 share the same second locking surface 2113, or the second locking surfaces 2113 of two adjacent button bosses 211 are mutually engaged and smoothly transitioned. Figure 4 The illustrated embodiment is the former, that is, two adjacent button bosses 211 share the same first locking surface 2112 , and two adjacent button bosses 211 share the same second locking surface 2113 .

[0035] like Figure 6 As shown, the button 2 is in the default position, that is, in the axial direction, the second locking surface 2113 abuts against the inclined surface 114 of the long boss of the first end cover. At this time, the pipeline is in a state of left-stopping liquid and right-passing liquid. Figure 1When the button 2 is pressed to the right, the long boss slope 114 of the first end cover separates from the second locking surface 2113, and the long boss 113 of the first end cover withdraws from the groove where the second locking surface 2113 is located. At this time, the button 2 is rotated counterclockwise again. When the long boss slope 114 of the first end cover is aligned with the button boss slope 2111, the two slopes will contact, and the button 2 is continued to be rotated counterclockwise until the first locking surface 2112 is fixed by the long boss slope 114 of the first end cover located on the long boss 113 of the first end cover, that is, the pipeline becomes in a state of left-flowing liquid and right-stopping liquid, such as Figure 2 Alternatively, in this embodiment, when the first end cover long boss inclined surface 114 contacts the button boss inclined surface 2111, there is no need to rotate the button 2. The spring 44 rebounds and pushes the first end cover long boss 113 to slide along the button boss inclined surface 2111, while forcing the button 2 to rotate counterclockwise until the first locking surface 2112 is fixed by the first end cover long boss inclined surface 114 located on the first end cover long boss 113.

[0036] like Figure 7 As shown, the first locking surface 2112 abuts against the inclined surface 114 of the long boss of the first end cover, and the pipeline is in a state of left-flowing liquid and right-stopping liquid, that is, Figure 2 Press the button 2 and rotate it counterclockwise. When the first end cover long boss inclined surface 114 is aligned with the button boss inclined surface 2111, the two inclined surfaces will contact each other. In the same way as above, the button 2 will rotate counterclockwise until the second locking surface 2113 is fixed by the first end cover long boss inclined surface 114 located on the first end cover long boss 113. At this time, the button 2 is restored to the state shown in the figure. Figure 6 and Figure 1 status.

[0037] To illustrate the above connection method, Figure 1-7 In the illustrated embodiment, the button boss bevel 2111 contacts and cooperates with the first end cover long boss bevel 114 and / or the first end cover short boss bevel 116 to form a bevel transition. The distance between the first locking surface 2112 and the proximal end of the button boss bevel 2111 is D, and the distance between the second locking surface 2113 and the proximal end of the button boss bevel 2111 is d, and the relationship between the two is D<d, that is, for a single first end cover long boss bevel 114, when it transitions from abutting with the second locking surface 2113 to abutting with the first locking surface 2112 via the button boss bevel 2111, because the first end cover long boss bevel 114 is fixedly arranged, the engagement depth between the first end cover long boss bevel 114 and the button 2 is approximately changed from d to D, so that the button 2 moves toward the second end cover 12 by a distance of approximately (dD), that is, from Figure 1 The status has changed to Figure 2From the perspective of the movement of the button 2 at each stage, since the contact surfaces between the button 2 and the first end cover long boss inclined surface 114 and the first end cover short boss inclined surface 116 are inclinedly matched, the second locking surface 2113 of the button 2 will rotate out of the connection with the first end cover long boss inclined surface 114, and the button 2 will continue to rotate so that the button boss inclined surface 2111 will match the inclined surface of the first end cover long boss inclined surface 114, and then continue to rotate, and the first locking surface 2112 will abut against the first end cover long boss inclined surface 114, so as to achieve the state of the button 2 at each stage. Figure 1 The status has changed to Figure 2 In general, when the depth of the first end cover long boss inclined surface 114 and the button 2 engaging with each other is approximately D, the button is in the state of Figure 2 In the state shown, the liquid path switching device is in the left-flowing and right-stopping state; when the depth of the button 2 at the engagement point between the long boss inclined surface 114 of the first end cover and the button 2 is approximately d, the button 2 is in the state shown in FIG. Figure 1 In the state shown, the liquid circuit switching device is in a state of left-stopping liquid and right-passing liquid. Since the spring 44 exerts a force on the button 2 toward the first end cover 11 during the entire rotation process of the button 2, the button 2 can be stably connected to the first locking surface 2112 and the second locking surface 2113 respectively, thereby stably maintaining the button 2 in the state of left-stopping liquid and right-passing liquid. Figure 2 and Figure 1 In the state shown, the second pipeline groove 3b and the first pipeline groove 3a are indirectly locked, and the on-off regulation of the first infusion pipeline and the second infusion pipeline is achieved.

[0038] It should be noted that if Figure 1-7 In the embodiment shown, there are a first end cover long boss inclined surface 114 and a first end cover short boss inclined surface 116. When the button 2 is rotated, the first end cover long boss inclined surface 114 alternately abuts against the first locking surface 2112 and the second locking surface 2113 of the button boss 211, so that the button 2 is respectively in Figure 2 and Figure 1 In the position shown, the first end cover short boss inclined surface 116 cooperates with the button boss 211 inclined surface to strengthen the stable support for the button 2 during rotation. However, those skilled in the art can also, under the guidance of this application, only set the first end cover long boss inclined surface 114 or the first end cover short boss inclined surface 116 according to actual needs to achieve connection with the button boss 211.

[0039] In a specific embodiment, Figure 1 and 2As shown, the pipeline switching assembly also includes a guide key 42, a positioning pin 45, an axial retaining ring 46 and a spring 44, the positioning pin 45 includes an end 451 and a main body 452, the outer diameter of the end 451 is larger than the outer diameter of the main body 452; a stepped hole 121 is provided in the second end cover 12, the stepped hole 121 includes a first through hole 1211 and a second through hole 1212 connected, the diameter of the first through hole 1211 is smaller than the outer diameter of the end 451 of the positioning pin 45, so that the end 451 of the positioning pin 45 is clamped in the second through hole 1212, the main body 45 The locating pin 45 extends through the first through hole 1211 into the cavity 3 and is connected to the reversing component 41. The end 451 of the locating pin 45 is placed in the second through hole 1212 of the second end cover 12. An annular groove is provided on the main body 452 of the locating pin 45 for the axial retaining ring 46 to be clamped in the annular groove. The axial retaining ring 46 is arranged in the cavity 3 near the second end cover 12. The axial retaining ring 46 axially limits the locating pin 45, so that the locating pin 45 provides stable axial support for the spring 44 and the reversing component 41. The reversing component 41 is a reversing valve core similar to a hollow sleeve. The connecting section 23 of the button 2 is inserted into one end of the reversing component 41. The main body 452 of the positioning pin 45 is inserted into the cavity at the other end of the reversing component 41. The reversing component 41 is sleeved outside the positioning pin 45 and can slide relative to the positioning pin 45. The main body 452 of the positioning pin 45 inserted into the reversing component 41 limits and supports the reversing component 41 in the radial direction and guides it in the axial direction. Therefore, the positioning pin 45 is inserted into the stepped hole 121 of the second end cover 12 and is axially fixed by the axial retaining ring 46, providing support and guidance for the reversing component 41. The spring 44 is sleeved on the main body 452 of the positioning pin 45 and is located between the reversing component 41 and the second end cover 12. One end of the spring 44 is connected to the second end cover 12, and the other end of the spring 44 is connected to the reversing component 41. The spring 44 provides elastic force for the button 2, so that the button 2 can be pressed in and out, and the first pipeline groove 3a and the second pipeline groove 3b in the cavity 3 are respectively implemented as follows: Figure 1 The left stop and right flow shown are Figure 2 The left side is for liquid flow and the right side is for liquid stop.

[0040] See also Figure 3This embodiment also provides an infusion system, including a pump body unit 10, a medicine box 20 and the above-mentioned liquid circuit switching device 30, the medicine box 20 includes a first medicine bag containing a first liquid and a second medicine bag containing a second liquid, the first medicine bag is connected to a first infusion pipeline, the second medicine bag is connected to a second infusion pipeline, the first infusion pipeline is fixed in the first pipeline groove 3a, the second infusion pipeline is fixed in the second pipeline groove 3b, the first infusion pipeline and the second infusion pipeline are respectively passed through the first pipeline groove 3a and the second pipeline groove 3b and converge into a pipeline, the transmission component inside the pump body unit 10 controls the infusion of the first liquid or the second liquid intermittently and with high precision by squeezing this pipeline. Preferably, the bottom of the medicine box 20 has a cavity, and the liquid circuit switching device 30 is detachably installed in the cavity at the bottom of the medicine box 20, so that the liquid circuit switching device 30 is connected to the cavity at the bottom of the medicine box 20 as a modular detachable component, and can be disassembled and reused. The infusion system may be a tumor chemotherapy infusion system, wherein the first liquid is a saline flushing liquid, and the second liquid is a chemotherapy liquid, or the first liquid is a chemotherapy liquid, and the second liquid is a saline flushing liquid. In other embodiments, the first liquid and the second liquid may be selected according to actual needs, and this embodiment does not impose any particular restrictions on this. Under the manual operation button 2, the position of the liquid stop member 43 is controlled to quickly switch the open and close infusion modes of the two liquid paths, thereby achieving the infusion of chemotherapy liquid and the flushing of the saline flushing liquid.

[0041] Inside the fluid path switching device 30, as shown in FIG. Figure 1 and Figure 2 As shown, the reversing component 41 is limited in the cavity 3 by the button 2, the first end cover 11, the second end cover 12, the positioning pin 45, the axial retaining ring 46 and the spring 44, and has only the freedom to slide along the axial direction of the cavity 3. The cylindrical portion of the connecting section 23 of the button 2 is inserted into the cylindrical hole of the reversing component 41 for connection. When the button 2 is in the zero position, the reversing component 41 is in the default position, that is, the liquid stopper 43 is close to the first stopper 14. At this time, the pipeline in the first pipeline groove 3a is tightly compressed, the first pipeline liquid circuit is in a closed state, and the second pipeline liquid circuit is in an open state, that is, the normal infusion of the chemotherapy solution, as shown in FIG. Figure 1 As shown; when the chemotherapy liquid is exhausted and the tube needs to be flushed with saline solution, the button 2 can be manually pressed to move it toward the second end cover 12, driving the reversing component 41 to move toward the second end cover 12. The spring 44 forms a force on the button 2 in the direction of the first end cover 11, constituting a resistance to the movement of the reversing component 41 toward the second end cover 12. At this time, the second infusion pipeline in the second pipeline groove 3b is tightly squeezed by the liquid stop member 43, the second infusion pipeline is in a closed state, and the first infusion pipeline is in an open state, that is, the infusion of the saline solution is started, as shown in FIG. Figure 2In this way, the switching of the liquid circuit is realized. After the infusion is completed, the medical staff or the patient himself only needs to press button 2 to switch the infusion, which greatly simplifies the clinical operation, improves the infusion efficiency, and saves medical resources.

[0042] After the infusion of the liquid medicine is completed, the liquid circuit switching device 30 of the present invention can be disassembled by itself, and after replacing a new medicine bag, the liquid circuit switching device 30 is reinstalled on the bottom of the medicine box 20, and a new infusion cycle can be started in conjunction with the pump body stand-alone 10. Compared with traditional three-way valve consumables, the infusion system provided by the present invention realizes non-direct contact switching with the liquid medicine, and the recycling greatly reduces the cost of consumables and the risk of contamination and leakage after biological sterilization.

[0043] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. A fluid path switching device, It is characterized in that The invention comprises a button, an end cover assembly, a cavity and a pipeline switching assembly, wherein the cavity is formed inside the end cover assembly, the cavity is provided with a first pipeline groove for installing a first infusion pipeline and a second pipeline groove for installing a second infusion pipeline, the end cover assembly comprises a first end cover, a second end cover, a first block and a second block, the cavity is provided between the first end cover and the second end cover, and the first pipeline groove and the second pipeline groove are provided between the first block and the second block; The pipeline switching assembly includes a reversing component and a liquid-stopping component, the liquid-stopping component is arranged between the first pipeline groove and the second pipeline groove, the distal end of the button passes through the first end cover and is connected to the reversing component, and the proximal end of the button is exposed to the first end cover, and the reversing component and the liquid-stopping component can move along the axial direction of the cavity under the control of the button, so that the button can drive the liquid-stopping component to squeeze the first infusion pipeline in the first pipeline groove or squeeze the second infusion pipeline in the second pipeline groove; the first end cover has a first cylindrical cavity and a second cylindrical cavity that are connected, and the button includes a key section, a matching section and a connecting section arranged in sequence, and the key section can slide relative to the first cylindrical cavity The shape of the mating section matches the shape of the second cylindrical cavity, and the connecting section is matingly plugged with the reversing component; the mating section includes a plurality of button bosses circumferentially arranged around the button axis, and the button boss includes a first locking surface and a second locking surface, and the first locking surface and the second locking surface are at different positions in the axial direction of the button, and the first locking surface and the second locking surface are alternately arranged, and the second cylindrical cavity is provided with a first end cover long boss, and the first locking surface and the second locking surface alternately abut against the first end cover long boss as the button rotates, so that the button can drive the liquid-stopping member to stay at a position to stop the flow of the second infusion pipeline or a position to stop the flow of the first infusion pipeline accordingly.

2. The fluid path switching device according to claim 1, It is characterized in that The pipeline switching assembly also includes a guide key, and the liquid-stopping member is fixedly connected to the reversing component via the guide key.

3. The fluid path switching device according to claim 1, It is characterized in that The pipeline switching assembly also includes a positioning pin and an axial retaining ring. The positioning pin is inserted into the cavity through the second end cover. The axial retaining ring is used to axially position the positioning pin. The reversing component is sleeved outside the positioning pin and can slide relative to the positioning pin.

4. The liquid path switching device according to claim 3, It is characterized in that The locating pin is provided with an annular groove, the axial retaining ring is clamped in the annular groove, the axial retaining ring is arranged in the cavity and close to the second end cover, and the axial retaining ring axially limits the locating pin, so that the locating pin provides stable axial support for the spring and the reversing component.

5. The liquid path switching device according to claim 3, It is characterized in that The pipeline switching assembly also includes a spring, the spring is sleeved on the positioning pin, and the two ends of the spring are respectively connected to the second end cover and the reversing component.

6. The fluid path switching device according to claim 1, It is characterized in that The button boss also includes a button boss inclined surface, the first locking surface and the second locking surface are arranged on both sides of the button boss inclined surface, the second cylindrical cavity is also provided with a first end cover short boss, the first end cover long boss and the first end cover short boss are respectively provided with a first end cover long boss inclined surface and a first end cover short boss inclined surface, the button boss inclined surface is slidably connected with the first end cover long boss inclined surface and / or the first end cover short boss inclined surface as the button rotates, so that when the button is pressed, the button rotates relative to the first end cover and expands and contracts relative to the cavity.

7. The fluid path switching device according to claim 1, It is characterized in that The first pipeline groove and the second pipeline groove are C-shaped.

8. An infusion system, It is characterized in that It comprises a pump body, a medicine box and a liquid circuit switching device according to any one of claims 1 to 7, wherein the medicine box comprises a first medicine bag filled with a first liquid and a second medicine bag filled with a second liquid, the first medicine bag is connected to a first infusion pipeline, the second medicine bag is connected to a second infusion pipeline, the first infusion pipeline is fixed in the first pipeline groove, the second infusion pipeline is fixed in the second pipeline groove, the pump body is connected to the medicine box, and the pump body is used to control the infusion of the first liquid or the second liquid.

9. The infusion system according to claim 8, It is characterized in that The bottom of the medicine box has a cavity, and the liquid path switching device is detachably installed in the cavity at the bottom of the medicine box.

10. The infusion system according to claim 8, It is characterized in that The first liquid is a physiological saline solution for flushing the tubes, and the second liquid is a chemotherapy solution, or the first liquid is a chemotherapy solution, and the second liquid is a physiological saline solution for flushing the tubes.

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