Infusion device

Abstract

The utility model relates to an infusion device, which is applied to the technical field of medical instruments and solves the problems that bubbles are easy to exist in a liquid bag in an existing infusion pump of which a liquid path is communicated, so that the liquid medicine conveying rate is influenced, and a volumetric micropump is easy to damage. Comprising a shell, a medicine storage device, a liquid driving device, a volumetric micropump, a controller and a liquid path communicating vessel are arranged in the shell, the liquid path communicating vessel comprises a fixing base, a liquid flowing channel, a communication stopping piece and an embedded groove, and the axis of the embedded groove is perpendicular to the axis of the liquid flowing channel; the bottom end of the embedded groove extends to the position below the axis of the liquid flowing channel in the axial direction of the embedded groove, and the communication stopping piece is embedded in the embedded groove and used for controlling the liquid flowing channel to be connected or disconnected. The volume type micro-pump has the advantages that gas in the volume type micro-pump is not prone to entering the liquid driving device to form bubbles, and the risk that the volume type micro-pump is damaged during working is reduced.

Description

Technical Field

[0001] The utility model is applied in the technical field of medical equipment, and particularly relates to an infusion device. Background Art

[0002] Existing infusion pumps include a hydraulic bag, a volumetric pump, and a drug reservoir. The principle is as follows: under the control of an electrical signal, the volumetric micropump draws a fixed volume of hydraulic liquid from the liquid bag (the liquid bag contracts elastically), and then pumps it into the liquid chamber of the hydraulic drug reservoir, thereby pushing the piston of the hydraulic drug reservoir forward. The piston pushes the same volume of liquid medicine in the drug chamber of the hydraulic drug reservoir to be pumped out.

[0003] The existing infusion pumps have the following problems:

[0004] 1. The volumetric micropump and the liquid bag are connected before leaving the factory. The gas inside the volumetric micropump can easily enter the liquid bag and form bubbles. During the subsequent pumping process, when the bubbles in the liquid bag are sucked into the pump cavity, errors may occur due to the different pumping rates of gas and liquid by the volumetric pump.

[0005] 2. The positive displacement micropump and the liquid bag are connected before leaving the factory. When the product is transported at temperatures below zero degrees Celsius, the liquid in the liquid bag may freeze and expand into the positive displacement micropump, causing damage to the positive displacement micropump.

[0006] 3. When the flexible liquid bag is stored on the shelf for a long time, the hydraulic liquid inside may evaporate through the liquid bag film. Utility Model Content

[0007] The purpose of the utility model is to provide an infusion device that solves the problems of bubbles easily existing in the liquid bag of the existing infusion pump with connected liquid paths, the liquid in the liquid bag freezing and possibly entering the volumetric micropump due to volume expansion, affecting the drug delivery rate and the problem of easy damage to the volumetric micropump.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] The utility model provides an infusion device, comprising a shell, in which a medicine reservoir, a driving liquid device, a volumetric micropump, a controller and a liquid circuit connector are arranged. The liquid circuit connector includes a fixed seat, a liquid flow channel that transversely passes through the fixed seat, a stop member and an embedded groove arranged on the radial outer edge surface of the fixed seat. The liquid inlet end of the liquid flow channel is connected to the liquid outlet end of the driving liquid device, and the liquid outlet end of the liquid flow channel is connected to the suction end of the volumetric micropump. The stop member is embedded in the embedded groove to control the on and off of the liquid flow channel.

[0010] Furthermore, a sealing rubber plug is provided at the liquid outlet end of the liquid passage, and the suction end of the volumetric micropump pierces the sealing rubber plug and extends into the liquid passage.

[0011] Furthermore, the stop member includes a stop slider I longitudinally slidingly arranged in the embedded groove, a connecting hole I arranged on the stop slider I and connected to the liquid flow channel, and a sealing member I sleeved on the stop slider I. The bottom end of the embedded groove extends axially to below the axis of the liquid flow channel, and the height between the bottom end of the inner wall of the connecting hole I and the axial bottom end face of the stop slider I is greater than the inner diameter of the connecting hole I.

[0012] Furthermore, it also includes an automatic control switch for controlling the start and stop of the volumetric micropump, the automatic control switch includes a left electrode sheet, a right electrode sheet and a conductive plate, the left electrode sheet and the right electrode sheet are located on both radial sides of the stop slider I and are fixed on the fixed seat, the left electrode sheet and the right electrode sheet are connected to the controller through wires, the conductive plate is sleeved on the upper part of the stop slider I, and the conductive plate is used to connect the left electrode sheet and the right electrode sheet to achieve power supply.

[0013] Furthermore, the cross-section of the anti-passage slider I is circular or rectangular.

[0014] Furthermore, the stop member includes a stop slider II rotatably arranged in the embedded groove, a connecting hole II arranged on the stop slider II and connected to the liquid flow channel, and a sealing member II sleeved on the stop slider II. The bottom end of the embedded groove extends along its axial direction to below the axis of the liquid flow channel. A limiting groove for limiting the rotation angle of the stop slider II is arranged on the inner wall of the embedded groove along its circumference, and a limiting protrusion cooperating with the limiting groove is provided on the stop slider II.

[0015] Furthermore, the sealing member I includes a first sealing ring and a second sealing ring, which are sleeved on the stopper slider I and respectively located above and below the communicating hole I. A placement groove for the first sealing ring is provided in the embedding groove at a position corresponding to the first sealing ring. Furthermore, the stopper includes a stopper slider III that slides longitudinally within the embedding groove and a sealing member III sleeved on the stopper slider III. The embedding groove extends downward along its axis to communicate with the liquid flow channel. The bottom end of the stopper slider III is shaped to match the inner wall of the liquid flow channel and is pressed against the inner wall of the liquid flow channel.

[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0017] The present invention provides an infusion device comprising a housing, within which are disposed a drug reservoir, a drive fluid reservoir, a volumetric micropump, a fluid communication device, and a controller. The fluid communication device is used to control the connection between the suction end of the volumetric micropump and the fluid outlet of the drive fluid reservoir. Before use, the volumetric micropump and the drive fluid reservoir are disconnected, preventing gas within the volumetric micropump from entering the drive fluid reservoir and forming bubbles.

[0018] When transported below zero degrees Celsius, if the driving fluid in the driving fluid container freezes and expands in volume, the driving fluid in the driving fluid container is unlikely to enter the positive displacement micropump due to the volume expansion of the driving fluid, thereby protecting the positive displacement micropump and reducing the risk of damage to the positive displacement micropump during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0020] Figure 1 This is a cross-sectional view of the overall structure of the infusion device in Example 1 of the present utility model;

[0021] Figure 2 This is a partial enlarged view of Example 1 of the present utility model in a state where the liquid path is not connected;

[0022] Figure 3 This is a partial enlarged view of the liquid path in the connected state in Example 1 of the present utility model;

[0023] Figure 4 This is a partially enlarged top view of Example 1 of the present utility model;

[0024] Figure 5 This is a partially enlarged top view of Example 2 of the present utility model in a state where the liquid path is not connected;

[0025] Figure 6 This is a partially enlarged top view of the liquid path in the connected state in Example 2 of the present utility model;

[0026] Figure 7 This is a partial enlarged view of Example 3 of the present utility model when the liquid path is not connected;

[0027] Figure 8 It is a partial enlarged view of the liquid path connected state in Example 3 of the present utility model.

[0028] The description of the accompanying drawings is as follows:

[0029] 1. Shell;

[0030] 2. Medicine reservoir; 21. Medicine reservoir piston; 22. Medicine storage chamber; 23. Drive chamber;

[0031] 3. Driving fluid device; 31. Driving fluid piston; 32. Pressure balance chamber; 33. Driving fluid storage chamber;

[0032] 4. Positive displacement micro pump; 41. Liquid outlet needle; 42. Liquid inlet needle;

[0033] 5. Liquid communication device; 51. Fixing seat; 52. Liquid flow channel; 53. Stop member; 531. Stop slider I; 532. Communication hole I; 533. Seal I; 5331. First sealing ring; 5332. Second sealing ring; 54. Embedded groove; 534. Stop slider II; 535. Communication hole II; 536. Stop slider III; 537. Seal III;

[0034] 6. Sealing rubber plug;

[0035] 7. Conductive plate;

[0036] 81. Left electrode sheet; 82. Right electrode sheet;

[0037] 9. Controller;

[0038] 10. Limiting groove; 11. Limiting protrusion. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the quartz tube processing auxiliary back cover assembly or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] refer to Figure 1 、 Figure 2 and Figure 3 , is an infusion device provided by the utility model, comprising a housing 1, in which a medicine reservoir 2, a driving liquid device 3, a volumetric micropump 4, a controller 9 and a liquid path connector 5 are arranged.

[0044] refer to Figure 1 The medicine reservoir 2 includes a medicine reservoir piston 21, a medicine storage chamber 22 arranged on the front side of the medicine reservoir piston 21, and a driving chamber 23 arranged on the rear side of the medicine reservoir piston 21. The medicine reservoir piston 21 can slide in the medicine reservoir 2 to change the size of the medicine storage chamber 22 and the driving chamber 23. The liquid outlet end of the medicine storage chamber 22 is connected to other equipment or components. When the driving liquid entering the driving chamber 23 pushes the medicine reservoir piston 21 to move, the medicine liquid in the medicine reservoir 2 is pumped out.

[0045] refer to Figure 1 The driving fluid container 3 stores driving fluid for driving the medicine reservoir piston 21 to slide. The driving fluid container 3 includes a driving fluid piston 31, a pressure balancing chamber 32 arranged in front of the driving fluid piston 31, and a driving fluid storage chamber 33 arranged behind the driving fluid piston 31. The pressure balancing chamber 32 is connected to the outside world. The driving fluid piston 31 can slide in the driving fluid container 3, thereby changing the size of the pressure balancing chamber 32 and the driving fluid storage chamber 33.

[0046] refer to Figure 1 、 Figure 2 and Figure 3 The positive displacement micropump 4 is used to pump the driving liquid in the driving liquid device 3 into the driving chamber 23, thereby pushing the drug reservoir piston 21 to slide in the drug reservoir 2 through the driving liquid; the pump outlet end of the positive displacement micropump 4 is provided with a liquid outlet needle 41 connected to the driving chamber 23, and the suction end of the positive displacement micropump 4 is provided with a liquid inlet needle 42.

[0047] The controller 9 is used to drive the volumetric micro pump 4 to suction and pump out.

[0048] refer to Figure 1 、 Figure 2 and Figure 3 The liquid communication device 5 includes a fixing seat 51, a liquid flow channel 52 that passes through the fixing seat 51 transversely, a through-stop 53, and an embedded groove 54 provided on the radial outer edge surface of the fixing seat 51;

[0049] The liquid inlet end of the liquid channel 52 is connected to the liquid outlet end of the driving liquid storage chamber 33. The liquid outlet end of the liquid channel 52 is provided with a sealing plug 6. The liquid inlet needle 42 provided at the suction end of the volumetric micropump 4 pierces the sealing plug 6 and extends into the liquid channel 52.

[0050] refer to Figure 1 、 Figure 2 and Figure 3 The bottom end of the embedded groove 54 extends axially to below the axis of the liquid flow channel 52. The stopper 53 is embedded in the embedded groove 54 to control the opening and closing of the liquid flow channel 52. The stopper 53 includes a stopper slider I531 that slides longitudinally in the embedded groove 54, a communication hole I532 provided on the stopper slider I531 and communicating with the liquid flow channel 52, and a sealing member I533 sleeved on the stopper slider I531. The height between the bottom end of the inner wall of the communication hole I532 and the axial bottom end surface of the stopper slider I531 is greater than the inner diameter of the communication hole I532.

[0051] refer to Figure 1 、 Figure 2 and Figure 3 The sealing member I533 includes a first sealing ring 5331 and a second sealing ring 5332. The first sealing ring 5331 and the second sealing ring 5332 are sleeved on the anti-passing slider I531 and are respectively located above and below the communicating hole I532. A placement groove for the first sealing ring 5331 is provided in the embedding groove 54 at a position corresponding to the first sealing ring 5331. With the cooperation of the first sealing ring 5331 and the second sealing ring 5332, the sealing performance of the anti-passing slider I531 and the embedding groove 54 is ensured, and leakage is not likely to occur when liquid is passed. At the same time, it can also play a role of limiting and fixing, so that the anti-passing slider I531 is firmly embedded in the embedding groove 54.

[0052] refer to Figure 1 、 Figure 2 and Figure 3 Before the infusion device of this structure is used, the anti-passage slider I531 is not completely embedded in the embedding groove 54. At this time, the communication hole I532 in the anti-passage slider I531 is located above the liquid flow channel 52. The structure of the anti-passage slider I531 located below the communication hole I532 blocks the liquid flow channel 52, thereby making the liquid flow channel 52 in a disconnected state. The second sealing ring 5332 is pressed against the two openings (the two openings are located at Figure 2 On the left and right sides of the groove 54 embedded in the middle), the anti-through slider I 531 blocks the liquid flow channel 52 more tightly. Therefore, when not in use, the volumetric micropump 4 and the driving liquid device 3 are in a disconnected state through the anti-through member 53, and the gas in the volumetric micropump 4 is not easy to enter the driving liquid device 3 to form bubbles; in addition, when transported below zero degrees Celsius, if the driving liquid in the driving liquid device 3 freezes and expands in volume, the driving liquid in the driving liquid device 3 is not easy to enter the volumetric micropump 4 due to the volume expansion of the driving liquid, thereby protecting the positive displacement micropump 4 and reducing the risk of damage to the positive displacement micropump 4 during operation.

[0053] refer to Figure 1 、 Figure 2 and Figure 3 When in use, the anti-passage slider Ⅰ531 is pressed down and moved downward until the communicating hole Ⅰ532 in the anti-passage slider Ⅰ531 is connected with the liquid flow channel 52, that is, the axis of the communicating hole Ⅰ532 and the axis of the liquid flow channel 52 are on the same straight line. Thereafter, the volumetric micropump 4 is controlled to work under the action of the controller 9, thereby pumping out the liquid medicine in the medicine storage chamber 23. The rate of the liquid medicine is stable during the pumping, thereby improving the accuracy of the liquid medicine pumping.

[0054] The micropump 4 is also equipped with an automatic control switch. The automatic control switch includes a left electrode sheet 81, a right electrode sheet 82, and a conductive plate 7. The left electrode sheet 81 and the right electrode sheet 82 are located on either side of the stop slider I531 and fixed to the fixed seat 51. The left electrode sheet 81 and the right electrode sheet 82 are connected to the controller 9 via wires. The conductive plate 7 is sleeved on the upper portion of the stop slider I532 and is used to connect the left electrode sheet 81 and the right electrode sheet 82 to achieve power supply. When the stop slider I531 is pressed downward to connect the connecting hole I532 with the liquid flow channel 52, the two ends of the conductive plate 7 just cover the left electrode sheet 81 and the right electrode sheet 82, thereby achieving a conductive path. The controller 9 then controls the operation of the micropump 4.

[0055] refer to Figures 1-4 The cross-sectional shape of the anti-through slider Ⅰ531 is circular or rectangular; when the cross-sectional shape of the anti-through slider Ⅰ531 is rectangular (refer to Figure 4 ), the shape of the embedded groove 54 is adapted to the shape of the anti-through slider Ⅰ531. The rectangular setting ensures that the anti-through slider Ⅰ531 is not easily deflected during longitudinal movement, thereby improving the accuracy of the matching between the communicating hole Ⅰ532 and the liquid flow channel 52.

[0056] Example 2

[0057] The content of this embodiment is basically the same as that of embodiment 1, except that:

[0058] refer to Figure 1 、 Figure 5 and Figure 6The stop member 53 includes a stop slider II 534 rotatably set in the embedded groove 54, a communicating hole II 535 set on the stop slider II 534 and connected to the liquid flow channel 52, and a sealing member II sleeved on the stop slider II 534. The structure and function of the sealing member II are the same as the structure and function of the sealing member I 533 in Example 1. A limiting groove 10 is provided on the inner wall of the embedded groove 54 along its circumference for limiting the rotation angle of the stop slider II 534, and a limiting protrusion 11 is provided on the stop slider II 534 to cooperate with the limiting groove 10. When this infusion pump is not used, the axis of the connecting hole II535 on the stop slider II534 is perpendicular to the axis of the liquid flow channel 52, and the liquid flow channel 52 is in a disconnected state; when this infusion pump is used, the stop slider II534 is rotated so that the axis of the connecting hole II535 in the stop slider II534 is in the same straight line as the axis of the liquid flow channel 52, and the liquid flow channel 52 is in a connected state. When the stop slider II534 is rotated, the cooperation between the limiting groove 10 and the limiting protrusion 11 can determine whether the liquid flow channel 52 is in a connected state.

[0059] Example 3

[0060] The content of this embodiment is basically the same as that of embodiment 1, except that:

[0061] refer to Figure 7 and Figure 8 The stopper 53 includes a stopper slider III536 that slides longitudinally within the embedded groove 52 and a sealing member III537 that sleeves on the stopper slider III536. The embedded groove 54 extends downward along its axis to communicate with the liquid channel 52. The bottom end of the stopper slider III536 is shaped to match the inner wall of the liquid channel 52 and abuts against the inner wall of the liquid channel 52. When the infusion pump is not in use, the bottom end of the stopper slider III536 abuts against the inner wall of the liquid channel 52, and the liquid channel 52 is disconnected. When the infusion pump is in use, the stopper slider III536 is pulled upward until the bottom end of the stopper slider III536 is located above the liquid channel 52, and the liquid channel 52 is connected.

[0062] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An infusion device, comprising a housing (1), wherein a drug reservoir (2), a driving fluid device (3), a positive displacement micropump (4), a controller (9) and a fluid communication device (5) are provided in the housing (1), characterized in that: The liquid path connector (5) comprises a fixed seat (51), a liquid flow channel (52) extending transversely through the fixed seat (51), a stopper (53), and an embedded groove (54) provided on the radial outer edge surface of the fixed seat (51). The liquid inlet end of the liquid flow channel (52) is connected to the liquid outlet end of the driving liquid device (3), and the liquid outlet end of the liquid flow channel (52) is connected to the suction end of the volumetric micropump (4). The stopper (53) is embedded in the embedded groove (54) to control the on / off of the liquid flow channel (52).

2. The infusion device according to claim 1, characterized in that The liquid outlet end of the liquid passage (52) is provided with a sealing rubber plug (6), and the suction end of the volumetric micro pump (4) pierces the sealing rubber plug (6) and extends into the liquid passage (52).

3. The infusion device according to claim 2, characterized in that: The stop member (53) includes a stop slider I (531) longitudinally slidably arranged in the embedded groove (54), a connecting hole I (532) arranged on the stop slider I (531) and connected to the liquid flow channel (52), and a sealing member I (533) sleeved on the stop slider I (531), the bottom end of the embedded groove (54) extends axially to below the axis of the liquid flow channel (52), and the height between the bottom end of the inner wall of the connecting hole I (532) and the axial bottom end face of the stop slider I (531) is greater than the inner diameter of the connecting hole I (532).

4. The infusion device according to claim 3, characterized in that: The invention also includes an automatic control switch for controlling the start and stop of the volumetric micropump (4), wherein the automatic control switch includes a left electrode sheet (81), a right electrode sheet (82) and a conductive plate (7), wherein the left electrode sheet (81) and the right electrode sheet (82) are located on both radial sides of the stop slider I (531) and are fixed on the fixing seat (51), and the left electrode sheet (81) and the right electrode sheet (82) are both connected to the controller (9) through wires, and the conductive plate (7) is sleeved on the upper part of the stop slider I (531), and the conductive plate (7) is used to connect the left electrode sheet (81) and the right electrode sheet (82) to achieve power supply.

5. The infusion device according to claim 4, characterized in that: The cross-section of the anti-passage slider I (531) is circular or rectangular.

6. The infusion device according to claim 2, characterized in that: The stop member (53) includes a stop slider II (534) rotatably arranged in the embedded groove (54), a communication hole II (535) arranged on the stop slider II (534) and connected to the liquid flow channel (52), and a sealing member II sleeved on the stop slider II (534). The bottom end of the embedded groove (54) extends along its axial direction to below the axis of the liquid flow channel (52). A limiting groove (10) for limiting the rotation angle of the stop slider II (534) is provided on the inner wall of the embedded groove (54) along its circumference. A limiting protrusion (11) cooperating with the limiting groove (10) is provided on the stop slider II (534).

7. The infusion device according to claim 3, characterized in that: The sealing member I (533) comprises a first sealing ring (5331) and a second sealing ring (5332), wherein the first sealing ring (5331) and the second sealing ring (5332) are sleeved on the stop slider I (531) and are respectively located above and below the communicating hole I (532), and a placement groove for placing the first sealing ring (5331) is provided at a position corresponding to the first sealing ring (5331) in the embedded groove (54).

8. The infusion device according to claim 2, characterized in that: The stop member (53) includes a stop slider III (536) longitudinally slidably arranged in the embedded groove (54) and a sealing member III sleeved on the stop slider III (536). The embedded groove (54) extends downward along its axis to communicate with the liquid flow channel (52). The bottom end shape of the stop slider III (536) is adapted to the inner wall shape of the liquid flow channel (52) and is pressed against the inner wall of the liquid flow channel (52).

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