A self-priming nonlinear variable cross-section flow-stabilizing valve and its infusion device

Abstract

The present invention relates to a self-priming nonlinear variable cross-section flow-stabilizing valve and an infusion device thereof. A liquid inlet hole is provided on one side of the flow-stabilizing valve, a liquid discharge hole is provided on the other side of the flow-stabilizing valve, a liquid inlet hole and a liquid discharge hole are provided inside the flow-stabilizing valve, both of which are connected to the liquid inlet hole and the liquid discharge hole, a vertically arranged cantilever beam is installed in the liquid inlet hole, and a needle head adapted to the liquid discharge hole is fixedly connected to the end of the cantilever beam. The infusion device comprises an infusion pump and a flow-stabilizing valve, the output end of the infusion pump is connected to a liquid supply pipe fitting, the liquid supply pipe fitting is connected to the liquid inlet hole, and the liquid discharge hole of the flow-stabilizing valve is connected to an infusion pipe fitting. When the needle head is subjected to a change in pressure under a change in the flow rate of the liquid medicine, the cross-sectional shielding area of ​​the liquid discharge hole changes, thereby being able to adjust the infusion flow rate of the liquid medicine to a certain extent, thereby improving the stability of the flow rate of the liquid medicine in the infusion device; by installing the flow-stabilizing valve in the infusion device, the flow rate of the infusion device is stabilized, thereby improving the analgesic effect.

Description

Technical Field

[0001] The invention relates to the technical field of medical consumables, and in particular to a self-priming nonlinear variable-section flow-stabilizing valve and an infusion device thereof. Background Art

[0002] The mechanical infusion device used clinically can provide patients with continuous infusion of analgesic drugs. It has the advantages of low cost, easy operation, and no need for power supply. It is currently widely used in medical scenarios such as postoperative analgesia, labor analgesia, and chronic pain treatment.

[0003] The pump body of the mechanical infusion device has a silicone reservoir inside. The silicone reservoir can store a certain volume of liquid medicine. The liquid medicine generates a pressure higher than the atmospheric pressure and the human venous pressure under the surrounding effect of the capsule, and under the action of this pressure, the liquid medicine is caused to flow. The shortcoming of the current mechanical infusion device is that the duration of analgesia treatment for patients generally exceeds 48 hours. As a polymer material, the silicone reservoir itself has a stress relaxation effect. As time goes by, the pressure inside the silicone reservoir gradually decreases. If the infusion line and other accessories are not adjusted, the change in source pressure will cause the flow rate to be unstable during the terminal infusion, thereby affecting the analgesic effect to a certain extent. This is also a major pain point when using mechanical infusion devices clinically. Therefore, an infusion device with a stable infusion flow is urgently needed. Summary of the invention

[0004] The present invention provides a self-priming nonlinear variable cross-section flow-stabilizing valve and an infusion device thereof to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is: a self-priming nonlinear variable-section flow stabilizing valve, a liquid inlet hole is provided on one side of the flow stabilizing valve, a liquid discharge hole is provided on the other side of the flow stabilizing valve, a flow stabilizing cavity is provided in the flow stabilizing valve, the liquid inlet hole and the liquid discharge hole are both connected to the flow stabilizing cavity, a vertically arranged cantilever beam is installed in the flow stabilizing cavity, and a needle head adapted to the liquid discharge hole is fixedly connected to the end of the cantilever beam.

[0006] Preferably, the needle, liquid inlet hole and liquid discharge hole are all coaxially arranged; a mounting ring is installed in the flow stabilizing chamber, one end of the cantilever beam is fixedly connected to the inner wall of the mounting ring, and this end is recorded as the fixed end of the cantilever beam. The longitudinal section of the flow stabilizing valve is circular, and the mounting ring is coaxially arranged with the flow stabilizing valve, and the central axis of the cantilever beam along the length direction passes through the center of the mounting ring.

[0007] Preferably, the steady flow valve includes an inlet end cover, a liquid inlet hole is located on the inlet end cover, an end of the inlet end cover away from the liquid inlet hole is open, an end of the inlet end cover away from the liquid inlet hole is detachably fixedly connected to an outlet end cover, an end of the outlet end cover close to the inlet end cover is open, a cavity enclosed by the inlet end cover and the outlet end cover is recorded as a steady flow cavity, and the liquid discharge hole is located on the outlet end cover; the mounting ring is located between the inlet end cover and the outlet end cover, and the two side walls of the mounting ring respectively contact the inlet end cover and the outlet end cover.

[0008] Preferably, an inner side of the open end surface of the inlet end cover is provided with an annular mounting groove along its circumference, and the mounting groove is concentrically arranged with the inlet end cover. The open end surface of the outlet end cover is fixedly connected with a fixing ring matched with the mounting groove along its circumference. The fixing ring is annularly arranged, and an outer side wall of the fixing ring is provided with an external thread along its circumference, and an inner side wall of the mounting groove is provided with an internal thread matched with the external thread along its circumference. The mounting ring is located in the mounting groove and is concentrically arranged with the mounting groove and the inlet end cover, and the fixing ring is arranged in contact with the mounting ring.

[0009] Preferably, the liquid inlet hole is located at the end of the inlet end cover away from the fixed end of the cantilever beam, and the liquid discharge hole is located at the end of the outlet end cover away from the fixed end of the cantilever beam; the needle head includes a vertically arranged facade, and a needle head arranged in an arc is fixedly connected to one side of the facade. A cross-sectional view is made on the plane where the axis of the needle head is located, and a coordinate system is established on the plane where the cross-sectional view is located as a two-dimensional plane, with the axis line being the x-axis, the axis perpendicular to the axis line being the y-axis, and the intersection of the facade and the x-axis being defined as the origin of the coordinate axis. The distribution curve of the outer edge of the needle head satisfies formula (1):

[0010]

[0011] Wherein, S0 is the area of ​​the longitudinal section of the drainage hole in the y-axis direction; P0 is the pressure at the drainage hole (in clinical use, the pressure is related to the patient's vein); Q is the flow rate during the patient's infusion; K Q is the flow coefficient, K Q It is related to the flow channel structure when the fluid flows. After the geometric structure of the device is determined, K Q is a fixed value;

[0012] K L K is the deflection coefficient at the tip of the cantilever beam when it bends. Its magnitude is related to the geometric structure of the cantilever beam. L The expression satisfies formula (2):

[0013]

[0014] In formula (2), L is the length of the cantilever beam, E is the elastic modulus of the cantilever beam, b is the width of the cantilever beam, and h is the thickness of the cantilever beam.

[0015] A self-priming nonlinear variable cross-section constant flow infusion device, the device comprises an infusion pump, the device also comprises the above-mentioned steady flow valve, the output end of the infusion pump is connected with a liquid supply pipe, the liquid supply pipe is connected with a liquid inlet hole, and the discharge hole of the steady flow valve is connected with an infusion pipe;

[0016] The infusion pump comprises an infusion component, the outer part of the infusion component is sleeved with a liquid storage bag, the infusion component comprises a vertically arranged fixed push rod and a vertically arranged movable push rod, the bottom of the liquid storage bag is connected to the outer side wall of the fixed push rod, the top of the liquid storage bag is connected to the outer side wall of the movable push rod, and the central axis of the liquid storage bag along the length direction, the central axis of the fixed push rod along the length direction and the central axis of the movable push rod along the length direction coincide with each other, and the movable push rod is slidably connected with the fixed push rod;

[0017] The fixed push rod is a cavity structure with openings at both ends, a flow guide hole is opened on the outer wall of the fixed push rod, and the cavity structure of the fixed push rod is connected to the liquid supply pipe fitting;

[0018] Preferably, the fixed push rod includes an outer sleeve, which is a hollow structure with open ends. The lower part of the outer sleeve is fixedly connected to the liquid storage bag and the outer sleeve is connected to the liquid supply pipe. The movable push rod includes a mounting sleeve, which is a hollow structure with open one end. The open end of the mounting sleeve is arranged close to the outer sleeve. A vertically arranged sliding rod is fixedly connected to the top surface inside the mounting sleeve. The end of the sliding rod is located outside the mounting sleeve and extends into the cavity of the outer sleeve. The outer diameter of the sliding rod is smaller than the inner diameter of the outer sleeve.

[0019] Preferably, the sliding rod and the mounting sleeve are concentrically arranged, the outer wall of the sliding rod and the inner wall of the mounting sleeve are spaced apart, the outer wall of the sliding rod is sleeved with a guide column, and the guide column is slidably connected to the sliding rod and the mounting sleeve, and the bottom end of the guide column extends to the outside of the mounting sleeve and is fixedly connected to the top of the outer sleeve.

[0020] Preferably, the outer diameter of the outer sleeve is consistent with that of the mounting sleeve, and the guide hole is located on the guide column and is arranged close to the outer sleeve.

[0021] Preferably, an outer protective bottle is further sleeved on the outside of the liquid storage capsule, and one end of the outer protective bottle is fixedly connected to the outer side wall of the fixed push rod; the guide holes are arranged at intervals along the circumference of the guide column.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) By arranging a needle matched with the drainage hole in the flow-stabilizing valve, the needle can be self-priming and adaptively adjusted in position under the change of the internal pressure of the liquid storage bag, so that the cross-sectional area of ​​the drainage hole blocked by the needle changes with the change of pressure, thereby adjusting the flow of the flow-stabilizing valve and the infusion device to a certain extent, and improving the stability of the flow of the drug solution in the infusion device;

[0024] (2) By setting the needle structure, when the needle is subjected to different pressures and the position of the needle changes, the flow rate of the liquid medicine in the discharge hole remains unchanged, so that the flow stabilizing valve has a constant flow rate, and thus the infusion device has a constant flow effect;

[0025] (3) The cantilever beam is fixedly connected to the mounting ring arranged in an annular shape, and the cantilever beam is arranged at the center of the mounting ring. The mounting ring and the inlet end cover and the outlet end cover of the flow stabilizing valve are arranged concentrically, so that the cantilever beam is subjected to uniform force and the sensitivity of the cantilever beam to pressure changes is improved, thereby ensuring the accuracy of the needle head in regulating the flow rate of the drug solution;

[0026] (4) By installing the flow stabilizing valve in the infusion device, the flow rate of the infusion device can be stabilized, thereby improving the analgesic effect. The arrangement of the sliding rod in the liquid storage bag that is slidably connected to the outer sleeve improves the stability of the liquid storage bag when it is contracted;

[0027] (5) By arranging a plurality of guide holes around the guide column, the situation that the drug liquid flows poorly or the drug liquid flow rate changes due to the blockage of the guide holes is reduced; by arranging the guide column, it is convenient to improve the stability of the gap between the slide rod and the outer sleeve, and improve the smoothness of the drug liquid flowing in the outer sleeve;

[0028] (6) The infusion component includes a fixed push rod and a movable push rod slidably connected to the fixed push rod. By setting the infusion component as a two-level structure, the size of the outer protective bottle is minimized within the effective length range of the liquid storage bag, which helps to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the flow stabilizing valve of the present invention;

[0030] Figure 2 It is a schematic diagram of the connection relationship between the cantilever beam and the mounting ring of the present invention;

[0031] Figure 3 For the present invention Figure 1 A partial enlarged view of the M in the middle;

[0032] Figure 4 It is a schematic diagram of the structure of the outlet end cover of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the inlet end cover of the present invention;

[0034] Figure 6 is a distribution curve of the needle edge in the coordinate system of the present invention;

[0035] Figure 7 It is a schematic diagram of the structure of the infusion device of the present invention;

[0036] Figure 8 It is a schematic diagram of the connection relationship between the liquid storage capsule and the fixed push rod and the movable push rod of the present invention;

[0037] Fig. 9 It is a structural schematic diagram of the mobile push rod of the present invention;

[0038] Fig.10 It is a schematic structural diagram of the fixed push rod of the present invention. DETAILED DESCRIPTION

[0039] In order to better illustrate the present invention, it is further described in conjunction with examples.

[0040] The first aspect of the present invention protects a self-priming nonlinear variable cross-section flow regulating valve, such as Figure 1-Figure 3 As shown, a liquid inlet hole 2 is provided on one side of the flow stabilizing valve 1, a liquid discharge hole 3 is provided on the other side of the flow stabilizing valve 1, a flow stabilizing chamber 4 is provided inside the flow stabilizing valve 1, the liquid inlet hole 2 and the liquid discharge hole 3 are both connected to the flow stabilizing chamber 4, a vertically arranged cantilever beam 5 is installed inside the flow stabilizing chamber 4, and a needle 6 adapted to the liquid discharge hole 3 is fixedly connected to the end of the cantilever beam 5. The liquid medicine enters the flow stabilizing chamber 4 through the liquid inlet hole 2, and the needle 6 moves toward the liquid discharge hole 3 under the pressure of the liquid medicine. The greater the pressure of the liquid medicine, the closer the cantilever beam 5 is to the liquid discharge hole 3, thereby reducing the connection area between the liquid discharge hole 3 and the flow stabilizing chamber 4. If the pressure of the medicine in the liquid inlet hole 2 remains unchanged, the distance between the cantilever beam 5 and the drainage hole 3 also remains constant, thereby stabilizing the flow of the medicine in the drainage hole 3; if the pressure of the medicine in the liquid inlet hole 2 increases, the cantilever beam 5 moves toward the drainage hole 3, thereby reducing the connecting area between the drainage hole 3 and the flow stabilizing cavity 4, thereby stabilizing the flow of the medicine in the drainage hole 3 and improving the analgesic effect.

[0041] In another embodiment, the needle 6 is a rotating body, and the needle 6, the liquid inlet hole 2, and the liquid discharge hole 3 are all coaxially arranged, that is, the central axes of the needle 6, the liquid discharge hole 3, and the liquid inlet hole 2 in the horizontal direction coincide with each other, thereby improving the flow stabilization effect of the needle 6 and facilitating timely adjustment of the liquid discharge hole 3.

[0042] In another embodiment, a mounting ring 7 is installed in the flow stabilizing chamber 4, one end of the cantilever beam 5 is fixedly connected to the inner wall of the mounting ring 7, and the end is recorded as the fixed end of the cantilever beam 5, the longitudinal section of the flow stabilizing valve 1 is circular, and the mounting ring 7 is arranged concentrically with the flow stabilizing valve 1, and the central axis of the cantilever beam 5 along the length direction passes through the center of the mounting ring 7. By arranging the mounting ring 7 concentrically with the flow stabilizing valve 1 and arranging the cantilever beam 5 through the center of the mounting ring 7, the cantilever beam 5 is an axisymmetric figure, and then the cantilever beam 5 is uniformly stressed as a whole when under pressure, so that the cantilever beam 5 as a whole approaches or moves away from the direction of the drainage hole 3, so that the needle 6 adjusts the drainage hole 3 more stably.

[0043] In another embodiment, Figure 1-5 As shown, the steady flow valve 1 includes an inlet end cover 8, a liquid inlet hole 2 is located on the inlet end cover 8, an end of the inlet end cover 8 away from the liquid inlet hole 2 is open, an end of the inlet end cover 8 away from the liquid inlet hole 2 is detachably fixedly connected with an outlet end cover 9, an end of the outlet end cover 9 close to the inlet end cover 8 is open, the cavity surrounded by the inlet end cover 8 and the outlet end cover 9 is recorded as a steady flow cavity 4, and the discharge hole 3 is located on the outlet end cover 9; the mounting ring 7 is located between the inlet end cover 8 and the outlet end cover 9, and the two side walls of the mounting ring 7 respectively contact the inlet end cover 8 and the outlet end cover 9. By setting the inlet end cover 8 and the outlet end cover 9 in a detachable fixed connection, it is convenient to install and fix the mounting ring 7, so as to facilitate the adjustment of the position of the mounting ring 7, so that the mounting ring 7 and the steady flow valve 1 are in a concentric state. The inlet end cover 8 and the outlet end cover 9 can be connected by snap-fit ​​connection, threaded connection, or detachably fixed connection by bolts, which are not specifically limited here.

[0044] In another embodiment, the inner side of the open end face of the inlet end cover 8 is provided with an annular mounting groove 10 along its circumference, and the mounting groove 10 is provided concentrically with the inlet end cover 8. The open end face of the outlet end cover 9 is fixedly connected with a fixing ring 11 adapted to the mounting groove 10 along its circumference, and the fixing ring 11 can be provided integrally with the outlet end cover 9 to improve the sealing performance. The fixing ring 11 is provided in an annular manner, and an outer wall of the fixing ring 11 is provided with an outer thread along its circumference, and an inner wall of the mounting groove 10 is provided with an inner thread adapted to the outer thread along its circumference. The mounting ring 7 is located in the mounting groove 10 and adapted to the mounting groove 10, and the outer wall of the mounting ring 7 contacts the inner wall of the mounting groove 10, and the mounting ring 7 is provided concentrically with the mounting groove 10 and the inlet end cover 8, and the fixing ring 11 contacts the mounting ring 7. The arrangement of the mounting groove 10 facilitates the placement of the mounting ring 7 in the mounting groove 10, and the arrangement of the outer wall of the mounting ring 7 against the inner wall of the mounting groove 10 facilitates the positioning of the mounting ring 7, so that the mounting ring 7 can be arranged cocentrically with the inlet end cover 8 and the outlet end cover 9 after being installed in place. The arrangement of the fixing ring 11, on the one hand, facilitates the restriction of the position of the mounting ring 7 to ensure the stability of the mounting ring 7, and on the other hand, facilitates the arrangement of threads through the fixing ring 11 and the mounting groove 10, thereby realizing a detachable fixed connection between the inlet end cover 8 and the outlet end cover 9 through threads.

[0045] In another embodiment, an annular sealing ring 12 matching the mounting groove 10 is provided in the mounting groove 10, and the sealing ring 12 is provided against the mounting ring 7. The provision of the sealing ring 12 facilitates the improvement of the sealing performance of the connection between the inlet end cover 8 and the outlet end cover 9. At the same time, after the inlet end cover 8 and the outlet end cover 9 are installed in place, the outer side wall of the inlet end cover 8 near the end of the drain hole 3 is in contact with the side wall of the outlet end cover 9 or is provided with a slight interval, that is, the side wall of the outlet end cover 9 at the periphery of the fixing ring 11 is in contact with the side wall of the inlet end cover 8 or is provided with a slight interval, so as to ensure the sealing performance between the outlet end cover 9 and the inlet end cover 8.

[0046] In another embodiment, the liquid inlet hole 2 is located at the end of the inlet end cover 8 away from the fixed end of the cantilever beam 5, and the liquid discharge hole 3 is located at the end of the outlet end cover 9 away from the fixed end of the cantilever beam 5, so that the length of the cantilever beam 5 is long enough, and the inner diameters of the liquid inlet hole 2 and the liquid discharge hole 3 are much smaller than the length of the cantilever beam 5. The vertically arranged surface of the needle 6 away from the outlet end cover 9 is recorded as the vertical surface 13, and the height of the vertical surface 13 of the needle 6 is consistent with the inner diameter of the liquid discharge hole 3. Under this condition, when the cantilever beam 5 moves under the action of pressure, the movement of the needle 6 can be regarded as a rigid body translation, that is, as a linear movement. The needle 6 is arranged in an arc shape, and a cross-sectional view is made on the plane where the axis of the needle 6 is located, and a coordinate system is established with the plane where the cross-sectional view is located as a two-dimensional plane, such as Figure 6As shown, the axis is directly located as the x-axis, the axis perpendicular to the axis is directly located as the y-axis, and the intersection of the vertical surface 13 and the x-axis is defined as the origin of the coordinate axis. The distribution curve of the outer edge of the needle body satisfies formula (1):

[0047]

[0048] Wherein, S0 is the area of ​​the longitudinal section of the drainage hole 3 in the y-axis direction; P0 is the pressure at the drainage hole 3 (in clinical use, the pressure is related to the patient's vein); Q is the flow rate during the patient's infusion; K Q is the flow coefficient, K Q It is related to the flow channel structure when the fluid flows. After the geometric structure of the device is determined, K Q is a fixed value;

[0049] K L K is the deflection coefficient at the needle 6 when the cantilever beam 5 bends, and its magnitude is related to the geometric structure of the cantilever beam 5. L The expression satisfies formula (2):

[0050]

[0051] In formula (2), L is the length of the cantilever beam 5, specifically, the length of the cantilever beam 5 extends from its fixed end to the central axis of the needle 6, E is the elastic modulus of the cantilever beam 5, and b is the width of the cantilever beam 5, such as Figure 2 As shown, h is the thickness of the cantilever beam 5, as Figure 3 shown.

[0052] The inner side wall of the outlet end cover 9 close to the steady flow chamber 4 is marked as the alignment surface 22. Figure 6 As shown, point A of needle 6 is at pressure P A Under the action of the needle 6 and the alignment surface 22 in the same vertical plane, the needle 6 blocks the entrance of the drainage hole 3, and the area blocked is recorded as S A , that is, the longitudinal cross-sectional area of ​​the needle 6 at point A is S A , the longitudinal cross-sectional area of ​​the drainage hole 3 is S0, at this time, the flow rate of the liquid in the drainage hole 3 is Q A , Q A It can be expressed by formula (3):

[0053] Q A =K Q ×(S0-S A ) 2 ×(P A -P0) (3),

[0054] By transforming formula (3), we can get the pressure P at the inlet of the drainage hole 3: AThe expression of is shown in formula (4):

[0055]

[0056] When the needle 6 is at position A, the disturbance L generated by the needle 6 is A The expression is shown in formula (5):

[0057] L A =K L ×(P0×S A -P A ×S0) (5),

[0058] When the pressure at the inlet of the drain hole 3 changes, the pressure is marked as P B At this time, at pressure P B Under the action of , point B of the needle 6 and the alignment surface 22 are in the same vertical plane, and the needle 6 blocks the entrance of the drainage hole 3, and the area blocked is recorded as S B , that is, the longitudinal cross-sectional area of ​​the needle 6 at point B is S B At this time, the flow rate of the liquid in the drainage hole 3 is recorded as Q B , Q B It can be expressed by formula (6):

[0059] Q B =K Q ×(S0-S B ) 2 ×(P B -P0) (6),

[0060] By transforming formula (6), we can get the pressure P at the inlet of the drainage hole 3: B The expression of is shown in formula (7):

[0061]

[0062] When the needle 6 is at position B, the disturbance L generated by the needle 6 is B The expression is shown in formula (8):

[0063] L B =K L ×(P0×S B -P B ×S0) (8),

[0064] When the needle 6 reaches the position B from the position A, the axial displacement △L of the needle 6 can be obtained by formula (5) and formula (8), which is expressed as:

[0065] △L=x B -x A =K L ×[(PB -P A )×S0-(S B -S A )×P0] (9),

[0066] Substituting formula (4) and formula (7) into formula (9), we can get formula (10):

[0067] (10)

[0069] According to formula (10),

[0070]

[0071] The needle 6 is at pressure P A and P B When the drain hole 3 is blocked, the blocking area S A , S B It can be expressed as:

[0072] S A =πf 2 (x A ) (13),

[0073] S B =πf 2 (x B ) (14).

[0074] In formula (13) and formula (14), f(x) is the functional relationship agreed by formula (1). Combining formula (13) and formula (14) with formula (11) and formula (12), the flow rate Q at the two positions A and B is A With Q B Only the pressure P0, cross-sectional area S0, and constant coefficient K of the drainage hole 3 L , K Q is related to the pressure P in the steady flow chamber. A , P B It doesn't matter, therefore,

[0075] Q A =Q B (15).

[0076] That is to say, when the pressure in the infusion pump 14 changes, which in turn causes the pressure at the drainage hole 3 to change, the flow rate of the liquid medicine in the drainage hole 3 is not affected, so the flow stabilizing valve 1 has a constant flow rate.

[0077] The second aspect of the present invention protects a self-priming infusion device with a flow stabilizing function, such as Figure 7-10 As shown, the device includes an infusion pump 14 and the aforementioned steady flow valve 1. The output end of the infusion pump 14 is connected to a liquid supply pipe 15, and the output end of the liquid supply pipe 15 is connected to the liquid inlet 2, and the liquid discharge hole 3 is connected to an infusion pipe 16. Among them, the liquid supply pipe 15 is provided with a three-way valve, a stop clamp, etc., and the infusion pipe 16 is provided with an infusion needle, etc. The infusion pump 14, the liquid supply pipe 15 and the infusion pipe 16 are all prior arts, and their structures are not repeated here. When in use, the drug solution is transported to the infusion pump 14 through the three-way valve on the liquid supply pipe 15, and then the infusion pump 14 is started. The infusion pump 14 transports the drug solution to the steady flow valve 1 through the liquid supply pipe 15. Under the action of the steady flow valve 1, the drug solution is transported to the patient through the infusion pipe 16. The infusion pump 14 includes an infusion component, the outer part of which is provided with a liquid storage capsule 17, and the infusion component includes a vertically arranged fixed push rod 18 and a vertically arranged movable push rod 19, the bottom of the liquid storage capsule 17 is connected to the outer side wall of the fixed push rod 18, the top of the liquid storage capsule 17 is connected to the outer side wall of the movable push rod 19, and the central axis of the liquid storage capsule 17 along the length direction, the central axis of the fixed push rod 18 along the length direction and the central axis of the movable push rod 19 along the length direction coincide with each other, and the movable push rod 19 is slidably connected to the fixed push rod 18. The liquid storage capsule 17 and the fixed push rod 18 can be fixedly connected by a clamp, and the liquid storage capsule 17 and the movable push rod 19 can also be fixedly connected by a clamp, and the cavity between the liquid storage capsule 17 and the infusion component is used to store liquid medicine. The fixed push rod 18 is a cavity structure with openings at both ends, and a guide hole 20 is opened on the outer side wall of the fixed push rod 18, and the cavity structure of the fixed push rod 18 is connected to the liquid supply pipe 15. Under the pressure of the liquid storage bag 17 and the pressure of the human body's venous pressure, the medicine in the liquid storage bag 17 enters the cavity of the fixed push rod 18 through the guide hole 20, and is transported to the human body through the liquid supply pipe 15, the flow stabilizing valve 1, and the infusion pipe 16. During the medicine delivery process, the liquid storage bag 17 contracts to generate power for the delivery of the medicine, and at the same time drives the movable push rod 19 to slide along the fixed push rod 18 in the axial direction.

[0078] In another embodiment, the fixed push rod 18 includes an outer sleeve 1801, which is a hollow structure with two open ends. The outer side wall of the lower part of the outer sleeve 1801 is fixedly connected to the liquid storage bag 17 and the outer sleeve 1801 is connected to the liquid supply pipe 15. The movable push rod 19 includes a mounting sleeve 1901, which is a hollow structure with one open end. The open end of the mounting sleeve 1901 is arranged close to the outer sleeve 1801. A vertically arranged sliding rod 1902 is fixedly connected to the top end surface inside the mounting sleeve 1901. The end of the sliding rod 1902 is located outside the mounting sleeve 1901 and extends into the cavity of the outer sleeve 1801. The outer diameter of the sliding rod 1902 is slightly smaller than the inner diameter of the outer sleeve 1801, that is, there is a slight gap between the outer diameter of the sliding rod 1902 and the inner wall of the outer sleeve 1801 to ensure that the medicine can be transported to the liquid supply pipe 15 through the gap. By setting the slide bar 1902, it is easy to make the slide bar 1902 slide in the outer sleeve 1801, so that the movable push rod 19 can slide along the fixed push rod 18, thereby improving the stability of the liquid storage bag 17, and further improving the stability of the drug flow control of the infusion device to a certain extent.

[0079] In another embodiment, the slide rod 1902 is concentrically arranged with the mounting sleeve 1901, the outer wall of the slide rod 1902 is spaced apart from the inner wall of the mounting sleeve 1901, the outer wall of the slide rod 1902 is sleeved with a guide column 1802, the inner wall of the guide column 1802 abuts against the outer wall of the slide rod 1902, the outer wall of the guide column 1802 abuts against the inner wall of the mounting sleeve 1901, and the guide column 1802 is slidably connected with the slide rod 1902 and the mounting sleeve 1901, and the bottom end of the guide column 1802 extends to the outside of the mounting sleeve 1901 and is fixedly connected to the top of the outer sleeve 1801. The setting of the guide column 1802 facilitates the guiding and limiting of the sliding between the fixed push rod 18 and the movable push rod 19. Specifically, due to the slight gap between the outer diameter of the slide rod 1902 and the inner wall of the outer sleeve 1801, during the downward movement of the mounting sleeve 1901, the slide rod 1902 may be in a non-concentric state with the outer sleeve 1801, and the outer wall on one side of the slide rod 1902 abuts against the inner wall of the outer sleeve 1801, thereby hindering the flow of the medicine at this location, affecting the stability of the flow of the medicine in the device to a certain extent, and the guide column 1802 abuts against the slide rod 1902 and the mounting sleeve 1901, thereby guiding the movement of the slide rod 1902, reducing the situation where the slide rod 1902 abuts against the inner wall of the outer sleeve 1801 to a certain extent, ensuring the gap between the slide rod 1902 and the outer sleeve 1801, and thus improving the stability of the flow of the medicine. At the same time, the setting of the guide column 1802 prevents the slide bar 1902 from slipping out of the outer sleeve 1801 during the relative sliding between the movable push rod 19 and the fixed push rod 18, thereby ensuring the stability of the infusion pump body and improving the stability of drug delivery. On the other hand, the setting of the guide column 1802 also shortens the length of the outer sleeve 1801 to a certain extent, thereby shortening the length of the infusion pump 14 and reducing the volume of the device.

[0080] The guide holes 20 are located on the guide column 1802 and are arranged close to the outer sleeve 1801. The guide holes 20 are arranged at intervals along the circumference of the guide column 1802. When one side of the slide bar 1902 contacts the inner wall of the outer sleeve 1801, the guide holes 20 may be blocked. By providing a plurality of guide holes 20 and arranging them along the circumference of the outer sleeve 1801, it is convenient for the liquid medicine to enter the outer sleeve 1801 through the unblocked guide holes 20, so as to improve the smoothness of the liquid medicine flow. The outer diameter of the outer sleeve 1801 is consistent with that of the mounting sleeve 1901, and the length of the outer sleeve 1801 is also consistent. The flow guide hole 20 is arranged at one end of the guide column 1802 close to the outer sleeve 1801. On the one hand, it avoids the flow guide hole 20 from being covered during the movement of the mounting sleeve 1901 to the outer sleeve 1801. On the other hand, when there is less liquid medicine in the liquid storage capsule 17, the liquid medicine is mostly concentrated at the guide column 1802 close to the outer sleeve 1801, which facilitates the liquid medicine to enter the outer sleeve 1801 through the flow guide hole 20, thereby reducing the residual liquid medicine in the liquid storage capsule 17. The outer side of the liquid storage capsule 17 is also provided with an outer protective bottle 21, and one end of the outer protective bottle is fixedly connected to the outer side wall of the fixed push rod. The outer protective bottle 21 is convenient for protecting the liquid storage capsule 17 and the liquid medicine in the liquid storage capsule 17, and preventing the liquid storage capsule 17 from being subjected to external pressure, thereby ensuring the stability of the liquid medicine flow of the infusion device.

[0081] The guide column 1802 is also marked with scale lines (not shown in the figure), which makes it convenient for medical personnel to identify the volume of liquid medicine stored in the liquid storage capsule 17 according to the scale lines. At the same time, in order to match the scale lines, the liquid storage capsule 17 and the outer protective bottle 21 are both made of transparent materials. The specific material can be selected according to needs to meet clinical needs.

[0082] The above-described embodiments are only preferred embodiments of the present invention. It should be noted that those skilled in the art may make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as within the scope of protection of the present invention.

Claims

1. A self-priming nonlinear variable cross-section flow control valve, characterized in that: A liquid inlet hole is provided on one side of the flow stabilizing valve, a liquid discharge hole is provided on the other side of the flow stabilizing valve, a flow stabilizing cavity is provided inside the flow stabilizing valve, the liquid inlet hole and the liquid discharge hole are both connected to the flow stabilizing cavity, a vertically arranged cantilever beam is installed in the flow stabilizing cavity, and a needle head adapted to the liquid discharge hole is fixedly connected to the end of the cantilever beam.

2. A self-priming nonlinear variable cross-section flow-stabilizing valve according to claim 1, characterized in that: The needle, liquid inlet hole and liquid discharge hole are all coaxially arranged; a mounting ring is installed in the flow stabilizing chamber, one end of the cantilever beam is fixedly connected to the inner wall of the mounting ring, and this end is recorded as the fixed end of the cantilever beam. The longitudinal section of the flow stabilizing valve is circular, and the mounting ring is coaxially arranged with the flow stabilizing valve, and the central axis of the cantilever beam along the length direction passes through the center of the mounting ring.

3. A self-priming nonlinear variable cross-section flow-stabilizing valve according to claim 2, characterized in that: The steady flow valve includes an inlet end cover, a liquid inlet hole is located on the inlet end cover, an end of the inlet end cover away from the liquid inlet hole is open, an end of the inlet end cover away from the liquid inlet hole is detachably fixedly connected to an outlet end cover, an end of the outlet end cover close to the inlet end cover is open, a cavity surrounded by the inlet end cover and the outlet end cover is recorded as a steady flow cavity, and the discharge hole is located on the outlet end cover; the mounting ring is located between the inlet end cover and the outlet end cover, and the two side walls of the mounting ring respectively contact the inlet end cover and the outlet end cover.

4. A self-priming nonlinear variable cross-section flow-stabilizing valve according to claim 3, characterized in that: An annular mounting groove is provided on the inner side of the open end surface of the inlet end cover along its circumference, and the mounting groove is concentrically arranged with the inlet end cover. A fixing ring matching the mounting groove is fixedly connected to the open end surface of the outlet end cover along its circumference. The fixing ring is annularly arranged, and an external thread is provided on the outer side wall of the fixing ring along its circumference, and an internal thread matching the external thread is provided on the inner side wall of the mounting groove along its circumference. The mounting ring is located in the mounting groove and is concentrically arranged with the mounting groove and the inlet end cover, and the fixing ring is arranged in contact with the mounting ring.

5. A self-priming nonlinear variable cross-section steady flow valve according to any one of claims 1 to 4, characterized in that: The liquid inlet hole is located at the end of the inlet end cover away from the fixed end of the cantilever beam, and the liquid discharge hole is located at the end of the outlet end cover away from the fixed end of the cantilever beam; the needle head includes a vertically arranged facade, and a needle head arranged in an arc is fixedly connected to one side of the facade. A cross-sectional view is made with the plane where the axis of the needle head is located, and a coordinate system is established on the plane where the cross-sectional view is located as a two-dimensional plane, with the axis line being the x-axis, the axis perpendicular to the axis line being the y-axis, and the intersection of the facade and the x-axis being defined as the origin of the coordinate axis. The distribution curve of the outer edge of the needle head satisfies formula (1): Where S0 is the area of ​​the longitudinal section of the drainage hole in the y-axis direction; P0 is the pressure at the drainage hole; Q is the flow rate during the patient infusion; K Q is the flow coefficient, K Q It is related to the flow channel structure when the fluid flows. After the geometric structure of the device is determined, K Q is a fixed value; K L K is the deflection coefficient at the tip of the cantilever beam when it bends. Its magnitude is related to the geometric structure of the cantilever beam. L The expression satisfies formula (2): In formula (2), L is the length of the cantilever beam, E is the elastic modulus of the cantilever beam, b is the width of the cantilever beam, and h is the thickness of the cantilever beam.

6. A self-priming nonlinear variable cross-section constant flow infusion device, the device comprising an infusion pump, characterized in that: The device further comprises the flow stabilizing valve according to any one of claims 1 to 5, the output end of the infusion pump is connected with a liquid supply pipe, the liquid supply pipe is connected with the liquid inlet hole, and the discharge hole of the flow stabilizing valve is connected with the liquid infusion pipe; The infusion pump comprises an infusion component, the outer part of the infusion component is sleeved with a liquid storage bag, the infusion component comprises a vertically arranged fixed push rod and a vertically arranged movable push rod, the bottom of the liquid storage bag is connected to the outer side wall of the fixed push rod, the top of the liquid storage bag is connected to the outer side wall of the movable push rod, and the central axis of the liquid storage bag along the length direction, the central axis of the fixed push rod along the length direction and the central axis of the movable push rod along the length direction coincide with each other, and the movable push rod is slidably connected with the fixed push rod; The fixed push rod is a cavity structure with openings at both ends. A flow guide hole is opened on the outer side wall of the fixed push rod. The cavity structure of the fixed push rod is connected to the liquid supply pipe fitting.

7. A self-priming nonlinear variable cross-section constant flow infusion device according to claim 6, characterized in that: The fixed push rod includes an outer sleeve, which is a hollow structure with open ends. The lower part of the outer sleeve is fixedly connected to the liquid storage bag and the outer sleeve is connected to the liquid supply pipe. The movable push rod includes a mounting sleeve, which is a hollow structure with open end. The open end of the mounting sleeve is arranged close to the outer sleeve. A vertically arranged sliding rod is fixedly connected to the top end surface inside the mounting sleeve. The end of the sliding rod is located outside the mounting sleeve and extends into the cavity of the outer sleeve. The outer diameter of the sliding rod is smaller than the inner diameter of the outer sleeve.

8. A self-priming nonlinear variable cross-section constant flow infusion device according to claim 7, characterized in that: The slide rod is concentrically arranged with the mounting sleeve, the outer wall of the slide rod is spaced apart from the inner wall of the mounting sleeve, the outer wall of the slide rod is sleeved with a guide column, and the guide column is slidably connected to the slide rod and the mounting sleeve, and the bottom end of the guide column extends to the outside of the mounting sleeve and is fixedly connected to the top of the outer sleeve.

9. A self-priming nonlinear variable cross-section constant flow infusion device according to claim 8, characterized in that: The outer diameter of the outer sleeve is consistent with that of the mounting sleeve, and the guide hole is located on the guide column and is arranged close to the outer sleeve.

10. A self-priming nonlinear variable cross-section constant flow infusion device according to claim 9, characterized in that: An outer protective bottle is also sleeved on the outside of the liquid storage bag, and one end of the outer protective bottle is fixedly connected to the outer side wall of the fixed push rod; the guide holes are arranged at intervals along the circumference of the guide column.

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